Trying to recover from deleted directory contents

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5329 42af7a65-404d-4744-a932-0658087f49c3

286 files changed, 32008 insertions, 0 deletions

diff --git a/nuttx/lib/Kconfig b/nuttx/lib/Kconfig
new file mode 100644
index 000000000..1c93bb047
--- /dev/null
+++ b/nuttx/lib/Kconfig
@@ -0,0 +1,275 @@
+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+config STDIO_BUFFER_SIZE
+	int "C STDIO buffer size"
+	default 64
+	---help---
+		Size of buffers using within the C buffered I/O interfaces.
+		(printf, putchar, fwrite, etc.).
+
+config STDIO_LINEBUFFER
+	bool "STDIO line buffering"
+	default y
+	---help---
+		Flush buffer I/O whenever a newline character is found in
+		the output data stream.
+
+config NUNGET_CHARS
+	int "Number unget() characters"
+	default 2
+	---help---
+		Number of characters that can be buffered by ungetc() (Only if NFILE_STREAMS > 0)
+
+config LIB_HOMEDIR
+	string "Home directory"
+	default "/"
+	depends on !DISABLE_ENVIRON
+	---help---
+		The home directory to use with operations like such as 'cd ~'
+
+source lib/math/Kconfig
+
+config NOPRINTF_FIELDWIDTH
+	bool "Disable sprintf support fieldwidth"
+	default n
+	---help---
+	sprintf-related logic is a
+	little smaller if we do not support fieldwidthes
+
+config LIBC_FLOATINGPOINT
+	bool "Enable floating point in printf"
+	default n
+	---help---
+		By default, floating point
+		support in printf, sscanf, etc. is disabled.
+
+choice
+	prompt "Newline Options"
+	default EOL_IS_EITHER_CRLF
+	---help---
+		This selection determines the line terminating character that is used.
+		Some environments may return CR as end-of-line, others LF, and others
+		both.  If not specified, the default is either CR or LF (but not both)
+		as the line terminating charactor.
+
+config EOL_IS_CR
+	bool "EOL is CR"
+
+config EOL_IS_LF
+	bool "EOL is LF"
+
+config EOL_IS_BOTH_CRLF
+	bool "EOL is CR and LF"
+
+config EOL_IS_EITHER_CRLF
+	bool "EOL is CR or LF"
+
+endchoice
+
+config LIBC_STRERROR
+	bool "Enable strerror"
+	default n
+	---help---
+		strerror() is useful because it decodes 'errno' values into a human readable
+		strings.  But it can also require a lot of memory.  If this option is selected,
+		strerror() will still exist in the build but it will not decode error values.
+		This option should be used by other logic to decide if it should use strerror()
+		or not.  For example, the NSH application will not use strerror() if this
+		option is not selected; perror() will not use strerror() is this option is not
+		selected (see also NSH_STRERROR).
+
+config LIBC_STRERROR_SHORT
+	bool "Use short error descriptions in strerror()"
+	default n
+	depends on LIBC_STRERROR
+	---help---
+		If this option is selected, then strerror() will use a shortened string when
+		it decodes the error.  Specifically, strerror() is simply use the string that
+		is the common name for the error.  For example, the 'errno' value of 2 will
+		produce the string "No such file or directory" is LIBC_STRERROR_SHORT
+		is not defined but the string "ENOENT" is LIBC_STRERROR_SHORT is defined.
+
+config LIBC_PERROR_STDOUT
+	bool "perror() to stdout"
+	default n
+	---help---
+		POSIX requires that perror() provide its output on stderr.  This option may
+		be defined, however, to provide perror() output that is serialized with
+		other stdout messages.
+
+config ARCH_LOWPUTC
+	bool "Low-level console output"
+	default "y"
+	---help---
+		architecture supports low-level, boot time console output
+
+config LIB_SENDFILE_BUFSIZE
+	int "sendfile() buffer size"
+	default 512
+	---help---
+		Size of the I/O buffer to allocate in sendfile().  Default: 512b
+
+config ARCH_ROMGETC
+	bool "Support for ROM string access"
+	default n
+	---help---
+		In Harvard architectures, data accesses and instruction accesses
+		occur on different busses, perhaps concurrently.  All data accesses
+		are performed on the data bus unless special machine instructions
+		are used to read data from the instruction address space.  Also, in
+		the typical MCU, the available SRAM data memory is much smaller that
+		the non-volatile FLASH instruction memory.  So if the application
+		requires many constant strings, the only practical solution may be
+		to store those constant strings in FLASH memory where they can only
+		be accessed using architecture-specific machine instructions.
+
+		If ARCH_ROMGETC is defined, then the architecture logic must export
+		the function up_romgetc().  up_romgetc() will simply read one byte
+		of data from the instruction space.
+
+		If ARCH_ROMGETC, certain C stdio functions are effected: (1) All
+		format strings in printf, fprintf, sprintf, etc. are assumed to lie
+		in FLASH (string arguments for %s are still assumed to reside in SRAM).
+		And (2), the string argument to puts and fputs is assumed to reside
+		in FLASH.  Clearly, these assumptions may have to modified for the
+		particular needs of your environment.  There is no "one-size-fits-all"
+		solution for this problem.
+
+config ARCH_OPTIMIZED_FUNCTIONS
+	bool "Enable arch optimized functions"
+	default n
+	---help---
+		Allow for architecture optimized implementations of certain library
+		functions.  Architecture-specific implementations can improve overall
+		system performance.
+
+if ARCH_OPTIMIZED_FUNCTIONS
+config ARCH_MEMCPY
+	bool "memcpy()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of memcpy().
+
+config MEMCPY_VIK
+	bool "Vik memcpy()"
+	default n
+	depends on !ARCH_MEMCPY
+	---help---
+		Select this option to use the optimized memcpy() function by Daniel Vik.
+		Select this option for improved performance at the expense of increased
+		size. See licensing information in the top-level COPYING file.
+
+if MEMCPY_VIK
+config MEMCPY_PRE_INC_PTRS
+	bool "Pre-increment pointers"
+	default n
+	---help---
+		Use pre-increment of pointers. Default is post increment of pointers.
+
+config MEMCPY_INDEXED_COPY
+	bool "Array indexing"
+	default y
+	---help---
+		Copying data using array indexing. Using this option, disables the
+		MEMCPY_PRE_INC_PTRS option.
+
+config MEMCPY_64BIT
+	bool "64-bit memcpy()"
+	default n
+	---help---
+		Compiles memcpy() for architectures that suppport 64-bit operations
+		efficiently.
+
+endif
+
+config ARCH_MEMCMP
+	bool "memcmp()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of memcmp().
+
+config ARCH_MEMMOVE
+	bool "memmove()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of memmove().
+
+config ARCH_MEMSET
+	bool "memset()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of memset().
+
+config MEMSET_OPTSPEED
+	bool "Optimize memset() for speed"
+	default n
+	depends on !ARCH_MEMSET
+	---help---
+		Select this option to use a version of memcpy() optimized for speed.
+		Default: memcpy() is optimized for size.
+
+config MEMSET_64BIT
+	bool "64-bit memset()"
+	default n
+	depends on MEMSET_OPTSPEED
+	---help---
+		Compiles memset() for architectures that suppport 64-bit operations
+		efficiently.
+
+config ARCH_STRCHR
+	bool "strchr()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strchr().
+
+config ARCH_STRCMP
+	bool "strcmp()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strcmp().
+
+config ARCH_STRCPY
+	bool "strcpy()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strcpy().
+
+config ARCH_STRNCPY
+	bool "strncpy()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strncpy().
+
+config ARCH_STRLEN
+	bool "strlen"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strlen().
+
+config ARCH_STRNLEN
+	bool "strlen()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strnlen().
+
+config ARCH_BZERO
+	bool "bzero()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of bzero().
+
+endif
diff --git a/nuttx/lib/Makefile b/nuttx/lib/Makefile
new file mode 100644
index 000000000..406c2276e
--- /dev/null
+++ b/nuttx/lib/Makefile
@@ -0,0 +1,136 @@
+############################################################################
+# lib/Makefile
+#
+#   Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+###########################################################################
+
+-include $(TOPDIR)/Make.defs
+
+ASRCS =
+CSRCS =
+
+DEPPATH := --dep-path .
+VPATH := .
+
+include stdio/Make.defs
+include stdlib/Make.defs
+include unistd/Make.defs
+include sched/Make.defs
+include string/Make.defs
+include pthread/Make.defs
+include semaphore/Make.defs
+include signal/Make.defs
+include mqueue/Make.defs
+include math/Make.defs
+include fixedmath/Make.defs
+include net/Make.defs
+include time/Make.defs
+include libgen/Make.defs
+include dirent/Make.defs
+include termios/Make.defs
+include queue/Make.defs
+include misc/Make.defs
+
+AOBJS = $(ASRCS:.S=$(OBJEXT))
+COBJS = $(CSRCS:.c=$(OBJEXT))
+
+SRCS = $(ASRCS) $(CSRCS)
+OBJS = $(AOBJS) $(COBJS)
+
+UBIN = libulib$(LIBEXT)
+KBIN = libklib$(LIBEXT)
+BIN  = liblib$(LIBEXT)
+
+all: $(BIN)
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+$(BIN):	$(OBJS)
+	@( for obj in $(OBJS) ; do \
+		$(call ARCHIVE, $@, $${obj}); \
+	done ; )
+
+ifneq ($(BIN),$(UBIN))
+.userlib:
+	@$(MAKE) $(UBIN) BIN=$(UBIN) TOPDIR=$(TOPDIR) EXTRADEFINES=$(EXTRADEFINES)
+	@touch .userlib
+
+$(UBIN): kclean .userlib
+endif
+
+ifneq ($(BIN),$(KBIN))
+.kernlib:
+	@$(MAKE) $(KBIN) BIN=$(KBIN) TOPDIR=$(TOPDIR) EXTRADEFINES=$(EXTRADEFINES)
+	@touch .kernlib
+
+$(KBIN): uclean .kernlib
+endif
+
+.depend: Makefile $(SRCS)
+	@$(MKDEP) $(DEPPATH) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	@touch $@
+
+depend: .depend
+
+# Clean Targets:
+# Clean user-mode temporary files (retaining the UBIN binary)
+
+uclean:
+ifneq ($(OBJEXT),)
+	@( if [ -f .userlib ]; then rm -f *$(OBJEXT); fi )
+endif
+	@rm -f .userlib *~ .*.swp
+
+# Clean kernel-mode temporary files (retaining the KBIN binary)
+
+kclean:
+ifneq ($(OBJEXT),)
+	@( if [ -f .kernlib ]; then rm -f *$(OBJEXT); fi )
+endif
+	@rm -f .kernlib *~ .*.swp
+
+# Really clean everything
+
+clean: uclean kclean
+	@rm -f $(BIN) $(UBIN) $(KBIN) *~ .*.swp
+	$(call CLEAN)
+
+# Deep clean -- removes all traces of the configuration
+
+distclean: clean
+	@rm -f Make.dep .depend
+
+-include Make.dep
diff --git a/nuttx/lib/README.txt b/nuttx/lib/README.txt
new file mode 100644
index 000000000..e99304841
--- /dev/null
+++ b/nuttx/lib/README.txt
@@ -0,0 +1,85 @@
+lib
+===
+
+This directory contains numerous, small functions typically associated with
+what you would expect to find in a standard C library.  The sub-directories
+in this directory contain standard interface that can be executed by user-
+mode programs.
+
+Normally, NuttX is built with no protection and all threads running in kerne-
+mode.  In that model, there is no real architectural distinction between
+what is a kernel-mode program and what is a user-mode program; the system is
+more like on multi-threaded program that all runs in kernel-mode.
+
+But if the CONFIG_NUTTX_KERNEL option is selected, NuttX will be built into
+distinct user-mode and kernel-mode sections.  In that case, most of the
+code in the nuttx/ directory will run in kernel-mode with with exceptions
+of (1) the user-mode "proxies" found in syscall/proxies, and (2) the
+standard C library functions found in this directory.  In this build model,
+it is critical to separate the user-mode OS interfaces in this way.
+
+Sub-Directories
+===============
+
+The files in the lib/ directory are organized (mostly) according which file
+in the include/ directory provides the prototype for library functions.  So
+we have:
+
+  libgen    - libgen.h
+  fixedmath - fixedmath.h
+  math      - math.h
+  mqueue    - pthread.h
+  net       - Various network-related header files: netinet/ether.h, arpa/inet.h
+  pthread   - pthread.h
+  queue     - queue.h
+  sched     - sched.h
+  semaphore - semaphore.h
+  stdio     - stdio.h
+  stdlib    - stdlib.h
+  string    - string.h
+  time      - time.h
+  unistd    - unistd.h
+
+There is also a misc/ subdirectory that contains various internal functions
+and interfaces from header files that are too few to warrant their own sub-
+directory:
+
+ misc       - Nonstandard "glue" logic, debug.h, crc32.h, dirent.h
+
+Library Database
+================
+
+Information about functions available in the NuttX C library information is
+maintained in a database.  That "database" is implemented as a simple comma-
+separated-value file, lib.csv.  Most spreadsheets programs will accept this
+format and can be used to maintain the library database.
+
+This library database will (eventually) be used to generate symbol library
+symbol table information that can be exported to external applications.
+
+The format of the CSV file for each line is:
+
+  Field 1: Function name
+  Field 2: The header file that contains the function prototype
+  Field 3: Condition for compilation
+  Field 4: The type of function return value.
+  Field 5 - N+5: The type of each of the N formal parameters of the function
+
+Each type field has a format as follows:
+
+  type name:
+        For all simpler types
+  formal type | actual type: 
+        For array types where the form of the formal (eg. int parm[2])
+        differs from the type of actual passed parameter (eg. int*).  This
+        is necessary because you cannot do simple casts to array types.
+  formal type | union member actual type | union member fieldname:
+        A similar situation exists for unions.  For example, the formal
+        parameter type union sigval -- You cannot cast a uintptr_t to
+        a union sigval, but you can cast to the type of one of the union
+        member types when passing the actual paramter.  Similarly, we
+        cannot cast a union sigval to a uinptr_t either.  Rather, we need
+        to cast a specific union member fieldname to uintptr_t.
+
+NOTE: The tool mksymtab can be used to generate a symbol table from this CSV
+file.  See nuttx/tools/README.txt for further details about the use of mksymtab.
diff --git a/nuttx/lib/dirent/Make.defs b/nuttx/lib/dirent/Make.defs
new file mode 100644
index 000000000..cc1d6b783
--- /dev/null
+++ b/nuttx/lib/dirent/Make.defs
@@ -0,0 +1,48 @@
+############################################################################
+# lib/dirent/Make.defs
+#
+#   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
+
+# Add the dirent C files to the build
+
+CSRCS += lib_readdirr.c lib_telldir.c
+
+# Add the dirent directory to the build
+
+DEPPATH += --dep-path dirent
+VPATH += :dirent
+
+endif
+
diff --git a/nuttx/lib/dirent/lib_readdirr.c b/nuttx/lib/dirent/lib_readdirr.c
new file mode 100644
index 000000000..47c5b9a7b
--- /dev/null
+++ b/nuttx/lib/dirent/lib_readdirr.c
@@ -0,0 +1,122 @@
+/****************************************************************************
+ * lib/dirent/lib_readdirr.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: readdir_r
+ *
+ * Description:
+ *   The readdir() function returns a pointer to a dirent
+ *   structure representing the next directory entry in the
+ *   directory stream pointed to by dir.  It returns NULL on
+ *   reaching the end-of-file or if an error occurred.
+ *
+ * Inputs:
+ *   dirp -- An instance of type DIR created by a previous
+ *     call to opendir();
+ *   entry -- The  storage  pointed to by entry must be large
+ *     enough for a dirent with an array of char d_name
+ *     members containing at least {NAME_MAX}+1 elements.
+ *   result -- Upon successful return, the pointer returned
+ *     at *result shall have the  same  value  as  the 
+ *     argument entry. Upon reaching the end of the directory
+ *     stream, this pointer shall have the value NULL.
+ *
+ * Return:
+ *   If successful, the readdir_r() function return s zero;
+ *   otherwise, an error number is returned to indicate the
+ *   error.
+ *
+ *   EBADF   - Invalid directory stream descriptor dir
+ *
+ ****************************************************************************/
+
+int readdir_r(FAR DIR *dirp, FAR struct dirent *entry,
+              FAR struct dirent **result)
+{
+  struct dirent *tmp;
+
+  /* NOTE: The following use or errno is *not* thread-safe */
+
+  set_errno(0);
+  tmp = readdir(dirp);
+  if (!tmp)
+    {
+       int error = get_errno();
+       if (!error)
+          {
+            if (result)
+              {
+                *result = NULL;
+              }
+            return 0;
+          }
+       else
+          {
+            return error;
+          }
+    }
+
+  if (entry)
+    {
+      memcpy(entry, tmp, sizeof(struct dirent));
+    }
+
+  if (result)
+    {
+      *result = entry;
+    }
+  return 0;
+}
+
diff --git a/nuttx/lib/dirent/lib_telldir.c b/nuttx/lib/dirent/lib_telldir.c
new file mode 100644
index 000000000..3753b326e
--- /dev/null
+++ b/nuttx/lib/dirent/lib_telldir.c
@@ -0,0 +1,91 @@
+/****************************************************************************
+ * lib/dirent/fs_telldir.c
+ *
+ *   Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+#include <nuttx/fs/dirent.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: telldir
+ *
+ * Description:
+ *   The telldir() function returns the current location
+ *   associated with the directory stream dirp.
+ *
+ * Inputs:
+ *   dirp -- An instance of type DIR created by a previous
+ *     call to opendir();
+ *
+ * Return:
+ *   On success, the telldir() function returns the current
+ *   location in the directory stream.  On error, -1 is
+ *   returned, and errno is set appropriately.
+ *
+ *   EBADF - Invalid directory stream descriptor dir
+ *
+ ****************************************************************************/
+
+off_t telldir(FAR DIR *dirp)
+{
+  struct fs_dirent_s *idir = (struct fs_dirent_s *)dirp;
+
+  if (!idir || !idir->fd_root)
+    {
+      set_errno(EBADF);
+      return (off_t)-1;
+    }
+
+  /* Just return the current position */
+
+  return idir->fd_position;
+}
+
diff --git a/nuttx/lib/fixedmath/Make.defs b/nuttx/lib/fixedmath/Make.defs
new file mode 100644
index 000000000..578e33015
--- /dev/null
+++ b/nuttx/lib/fixedmath/Make.defs
@@ -0,0 +1,43 @@
+############################################################################
+# lib/fixedmath/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the fixed precision math C files to the build
+
+CSRCS += lib_rint.c lib_fixedmath.c lib_b16sin.c lib_b16cos.c lib_b16atan2.c
+
+# Add the fixed precision math directory to the build
+
+DEPPATH += --dep-path fixedmath
+VPATH += :fixedmath
diff --git a/nuttx/lib/fixedmath/lib_b16atan2.c b/nuttx/lib/fixedmath/lib_b16atan2.c
new file mode 100644
index 000000000..69d132f80
--- /dev/null
+++ b/nuttx/lib/fixedmath/lib_b16atan2.c
@@ -0,0 +1,108 @@
+/****************************************************************************
+ * lib/fixedmath/lib_b16atan2.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <fixedmath.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define B16_C1     0x00000373 /* 0.013480470 */
+#define B16_C2     0x00000eb7 /* 0.057477314 */
+#define B16_C3     0x00001f0a /* 0.121239071 */
+#define B16_C4     0x00003215 /* 0.195635925 */
+#define B16_C5     0x0000553f /* 0.332994597 */
+#define B16_C6     0x00010000 /* 0.999995630 */
+#define B16_HALFPI 0x00019220 /* 1.570796327 */
+#define B16_PI     0x00032440 /* 3.141592654 */
+
+#ifndef MAX
+#  define MAX(a,b) (a > b ? a : b)
+#endif
+
+#ifndef MIN
+#  define MIN(a,b) (a < b ? a : b)
+#endif
+
+#ifndef ABS
+#  define ABS(a)   (a < 0 ? -a : a)
+#endif
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: b16atan2
+ *
+ * Description:
+ *   atan2 calculates the arctangent of y/x.  (Based on a algorithm I saw
+ *   posted on the internet... now I have lost the link -- sorry).
+ *
+ ****************************************************************************/
+
+b16_t b16atan2(b16_t y, b16_t x)
+{
+  b16_t t0;
+  b16_t t1;
+  b16_t t2;
+  b16_t t3;
+
+  t2 = ABS(x);
+  t1 = ABS(y);
+  t0 = MAX(t2, t1);
+  t1 = MIN(t2, t1);
+  t2 = ub16inv(t0);
+  t2 = b16mulb16(t1, t2);
+
+  t3 = b16mulb16(t2, t2); 
+  t0 =                   - B16_C1;
+  t0 = b16mulb16(t0, t3) + B16_C2;
+  t0 = b16mulb16(t0, t3) - B16_C3;
+  t0 = b16mulb16(t0, t3) + B16_C4;
+  t0 = b16mulb16(t0, t3) - B16_C5;
+  t0 = b16mulb16(t0, t3) + B16_C6;
+  t2 = b16mulb16(t0, t2);
+
+  t2 = (ABS(y) > ABS(x)) ? B16_HALFPI - t2 : t2;
+  t2 = (x < 0) ?  B16_PI - t2 : t2;
+  t2 = (y < 0) ? -t2 : t2;
+
+  return t2;
+}
diff --git a/nuttx/lib/fixedmath/lib_b16cos.c b/nuttx/lib/fixedmath/lib_b16cos.c
new file mode 100644
index 000000000..3e9229029
--- /dev/null
+++ b/nuttx/lib/fixedmath/lib_b16cos.c
@@ -0,0 +1,64 @@
+/****************************************************************************
+ * lib/fixedmath/lib_b16cos.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <fixedmath.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: b16cos
+ ****************************************************************************/
+
+b16_t b16cos(b16_t rad)
+{
+  /* Compute cosine: sin(rad + PI/2) = cos(rad) */
+
+  rad += b16HALFPI;
+  if (rad > b16PI)
+    {
+      rad -= b16TWOPI;
+    }
+  return b16sin(rad);
+}
diff --git a/nuttx/lib/fixedmath/lib_b16sin.c b/nuttx/lib/fixedmath/lib_b16sin.c
new file mode 100644
index 000000000..491b0ec78
--- /dev/null
+++ b/nuttx/lib/fixedmath/lib_b16sin.c
@@ -0,0 +1,110 @@
+/****************************************************************************
+ * lib/fixedmath/lib_b16sin.c
+ *
+ *   Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <fixedmath.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define b16_P225       0x0000399a
+#define b16_P405284735 0x000067c1
+#define b16_1P27323954 0x000145f3
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: b16sin
+ * Ref: http://lab.polygonal.de/2007/07/18/fast-and-accurate-sinecosine-approximation/
+ ****************************************************************************/
+
+b16_t b16sin(b16_t rad)
+{
+  b16_t tmp1;
+  b16_t tmp2;
+  b16_t tmp3;
+
+  /* Force angle into the good range */
+
+  if (rad < -b16PI)
+    {
+      rad += b16TWOPI;
+    }
+  else if (rad > b16PI)
+   {
+      rad -= b16TWOPI;
+   }
+
+  /* tmp1 = 1.27323954 * rad
+   * tmp2 = .405284735 * rad * rad
+   */
+
+
+  tmp1 = b16mulb16(b16_1P27323954, rad);
+  tmp2 = b16mulb16(b16_P405284735, b16sqr(rad));
+
+  if (rad < 0)
+    {
+       /* tmp3 = 1.27323954 * rad + .405284735 * rad * rad */
+
+       tmp3 = tmp1 + tmp2;
+    }
+  else
+    {
+       /* tmp3 = 1.27323954 * rad - 0.405284735 * rad * rad */
+
+       tmp3 = tmp1 - tmp2;
+    }
+
+  /* tmp1 = tmp3*tmp3 */
+
+  tmp1 = b16sqr(tmp3);
+  if (tmp3 < 0)
+    {
+      /* tmp1 = tmp3 * -tmp3 */
+
+      tmp1 = -tmp1;
+    }
+
+  /* Return sin = .225 * (tmp3 * (+/-tmp3) - tmp3) + tmp3 */
+
+  return b16mulb16(b16_P225, (tmp1 - tmp3)) + tmp3;
+}
diff --git a/nuttx/lib/fixedmath/lib_fixedmath.c b/nuttx/lib/fixedmath/lib_fixedmath.c
new file mode 100644
index 000000000..c1a710e73
--- /dev/null
+++ b/nuttx/lib/fixedmath/lib_fixedmath.c
@@ -0,0 +1,272 @@
+/****************************************************************************
+ * lib/math/lib_fixedmath.c
+ *
+ *   Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <fixedmath.h>
+
+#ifndef CONFIG_HAVE_LONG_LONG
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fixsign
+ ****************************************************************************/
+
+static void fixsign(b16_t *parg1, b16_t *parg2, bool *pnegate)
+{
+  bool negate = false;
+  b16_t arg;
+
+  arg = *parg1;
+  if (arg < 0)
+    {
+      *parg1 = -arg;
+      negate = true;
+    }
+
+  arg = *parg2;
+  if (arg < 0)
+    {
+      *parg2 = -arg;
+      negate ^= true;
+    }
+
+  *pnegate = negate;
+}
+
+/****************************************************************************
+ * Name: adjustsign
+ ****************************************************************************/
+
+static b16_t adjustsign(b16_t result, bool negate)
+{
+  /* If the product is negative, then we overflowed */
+
+  if (result < 0)
+    {
+      if (result)
+        {
+          return b16MIN;
+        }
+      else
+        {
+          return b16MAX;
+        }
+    }
+
+  /* correct the sign of the result */
+
+  if (negate)
+    {
+      return -result;
+    }
+  return result;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: b16mulb16
+ ****************************************************************************/
+
+b16_t b16mulb16(b16_t m1, b16_t m2)
+{
+  bool negate;
+  b16_t product;
+
+  fixsign(&m1, &m2, &negate);
+  product = (b16_t)ub16mulub16((ub16_t)m1, (ub16_t)m2);
+  return adjustsign(product, negate);
+}
+
+/****************************************************************************
+ * Name: ub16mulub16
+ **************************************************************************/
+
+ub16_t ub16mulub16(ub16_t m1, ub16_t m2)
+{
+ /* Let:
+ *
+  *   m1 = m1i*2**16 + m1f                                            (b16)
+  *   m2 = m2i*2**16 + m2f                                            (b16)
+  *
+  * Then:
+  *
+  *  m1*m2 = (m1i*m2i)*2**32 + (m1i*m2f + m2i*m1f)*2**16 + m1f*m2f     (b32)
+  *        = (m1i*m2i)*2**16 + (m1i*m2f + m2i*m1f) + m1f*m2f*2**-16    (b16)
+  *        = a*2**16 + b + c*2**-16
+  */
+
+  uint32_t m1i = ((uint32_t)m1 >> 16);
+  uint32_t m2i = ((uint32_t)m1 >> 16);
+  uint32_t m1f = ((uint32_t)m1 & 0x0000ffff);
+  uint32_t m2f = ((uint32_t)m2 & 0x0000ffff);
+
+  return (m1i*m2i << 16) + m1i*m2f + m2i*m1f + (((m1f*m2f) + b16HALF) >> 16);
+}
+
+/****************************************************************************
+ * Name: b16sqr
+ **************************************************************************/
+
+b16_t b16sqr(b16_t a)
+{
+  b16_t sq;
+
+  /* The result is always positive.  Just take the absolute value */
+
+  if (a < 0)
+    {
+      a = -a;
+    }
+
+  /* Overflow occurred if the result is negative */
+
+  sq = (b16_t)ub16sqr(a);
+  if (sq < 0)
+    {
+      sq = b16MAX;
+    }
+  return sq;
+}
+
+/****************************************************************************
+ * Name: b16divb16
+ **************************************************************************/
+
+ub16_t ub16sqr(ub16_t a)
+{
+ /* Let:
+ *
+  *   m = mi*2**16 + mf                                               (b16)
+  *
+  * Then:
+  *
+  *  m*m = (mi*mi)*2**32 + 2*(m1*m2)*2**16 + mf*mf                    (b32)
+  *      = (mi*mi)*2**16 + 2*(mi*mf)       + mf*mf*2**-16             (b16)
+  */
+
+  uint32_t mi = ((uint32_t)a >> 16);
+  uint32_t mf = ((uint32_t)a & 0x0000ffff);
+
+  return (mi*mi << 16) + (mi*mf << 1) + ((mf*mf + b16HALF) >> 16);
+}
+
+/****************************************************************************
+ * Name: b16divb16
+ **************************************************************************/
+
+b16_t b16divb16(b16_t num, b16_t denom)
+{
+  bool  negate;
+  b16_t quotient;
+
+  fixsign(&num, &denom, &negate);
+  quotient = (b16_t)ub16divub16((ub16_t)num, (ub16_t)denom);
+  return adjustsign(quotient, negate);
+}
+
+/****************************************************************************
+ * Name: ub16divub16
+ **************************************************************************/
+
+ub16_t ub16divub16(ub16_t num, ub16_t denom)
+{
+  uint32_t term1;
+  uint32_t numf;
+  uint32_t product;
+
+ /* Let:
+  *
+  *   num = numi*2**16 + numf                                         (b16)
+  *   den = deni*2**16 + denf                                         (b16)
+  *
+  * Then:
+  *
+  *  num/den = numi*2**16 / den + numf / den                          (b0)
+  *          = numi*2**32 / den + numf*2**16 /den                     (b16)
+  */
+
+  /* Check for overflow in the first part of the quotient */
+
+  term1 = ((uint32_t)num & 0xffff0000) / denom;
+  if (term1 >= 0x00010000)
+    {
+        return ub16MAX; /* Will overflow */
+    }
+
+  /* Finish the division */
+
+  numf    = num - term1 * denom;
+  term1 <<= 16;
+  product = term1 + (numf + (denom >> 1)) / denom;
+
+  /* Check for overflow */
+
+  if (product < term1)
+    {
+        return ub16MAX; /* Overflowed */
+    }
+  return product;
+}
+
+#endif
diff --git a/nuttx/lib/fixedmath/lib_rint.c b/nuttx/lib/fixedmath/lib_rint.c
new file mode 100644
index 000000000..3a6407b8c
--- /dev/null
+++ b/nuttx/lib/fixedmath/lib_rint.c
@@ -0,0 +1,135 @@
+/************************************************************
+ * lib/fixedmath/lib_rint.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <stdlib.h>
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/************************************************************
+ * Private Type Declarations
+ ************************************************************/
+
+/************************************************************
+ * Private Function Prototypes
+ ************************************************************/
+
+/**********************************************************
+ * Global Constant Data
+ **********************************************************/
+
+/************************************************************
+ * Global Variables
+ ************************************************************/
+
+/**********************************************************
+ * Private Constant Data
+ **********************************************************/
+
+/************************************************************
+ * Private Variables
+ ************************************************************/
+
+double_t rint(double_t x)
+{
+  double_t ret;
+
+  /* If the current rounding mode rounds toward negative
+   * infinity, rint() is identical to floor().  If the current
+   * rounding mode rounds toward positive infinity, rint() is
+   * identical to ceil().
+   */
+
+#if defined(CONFIG_FP_ROUND_POSITIVE) && CONFIG_FP_ROUNDING_POSITIVE != 0
+
+  ret = ceil(x);
+
+#elif defined(CONFIG_FP_ROUND_NEGATIVE) && CONFIG_FP_ROUNDING_NEGATIVE != 0
+
+  ret = floor(x);
+
+#else
+
+  /* In the default rounding mode (round to nearest), rint(x) is the
+   * integer nearest x with the additional stipulation that if
+   * |rint(x)-x|=1/2, then rint(x) is even.
+   */
+
+  long     dwinteger  = (long)x;
+  double_t fremainder = x - (double_t)dwinteger;
+
+  if (x < 0.0)
+    {
+      /* fremainder should be in range 0 .. -1 */
+
+      if (fremainder == -0.5)
+        {
+          dwinteger = ((dwinteger+1)&~1);
+        }
+      else if (fremainder < -0.5)
+        {
+          dwinteger--;
+        }
+    }
+  else
+    {
+      /* fremainder should be in range 0 .. 1 */
+
+      if (fremainder == 0.5)
+        {
+          dwinteger = ((dwinteger+1)&~1);
+        }
+      else if (fremainder > 0.5)
+        {
+          dwinteger++;
+        }
+    }
+
+  ret = (double_t)dwinteger;
+#endif
+
+  return ret;
+}
diff --git a/nuttx/lib/lib.csv b/nuttx/lib/lib.csv
new file mode 100644
index 000000000..171f64e9b
--- /dev/null
+++ b/nuttx/lib/lib.csv
@@ -0,0 +1,171 @@
+"_inet_ntoa","arpa/inet.h","!defined(CONFIG_NET_IPv6) && !defined(CONFIG_CAN_PASS_STRUCTS)","FAR char","in_addr_t"
+"abort","stdlib.h","","void"
+"abs","stdlib.h","","int","int"
+"asprintf","stdio.h","","int","FAR char **","const char *","..."
+"avsprintf","stdio.h","","int","FAR char **","const char *","va_list"
+"b16atan2","fixedmath.h","","b16_t","b16_t","b16_t"
+"b16cos","fixedmath.h","","b16_t","b16_t"
+"b16divb16","fixedmath.h","","b16_t","b16_t","b16_t"
+"b16mulb16","fixedmath.h","","b16_t","b16_t","b16_t"
+"b16sin","fixedmath.h","","b16_t","b16_t"
+"b16sqr","fixedmath.h","","b16_t","b16_t"
+"basename","libgen.h","","FAR char","FAR char *"
+"cfgetspeed","termios.h","CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_SERIAL_TERMIOS)","speed_t","FAR const struct termios *"
+"cfsetspeed","termios.h","CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_SERIAL_TERMIOS)","int","FAR struct termios *","speed_t"
+"chdir","unistd.h","CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)","int","FAR const char *"
+"crc32","crc32.h","","uint32_t","FAR const uint8_t *","size_t"
+"crc32part","crc32.h","","uint32_t","FAR const uint8_t *","size_t","uint32_t"
+"dbg","debug.h","!defined(CONFIG_CPP_HAVE_VARARGS) && defined(CONFIG_DEBUG)","int","const char *","..."
+"dbg_enable","debug.h","defined(CONFIG_DEBUG_ENABLE)","void","bool"
+"dirname","libgen.h","","FAR char","FAR char *"
+"dq_addafter","queue.h","","void","FAR dq_entry_t *","FAR dq_entry_t *","FAR dq_queue_t *"
+"dq_addbefore","queue.h","","void","FAR dq_entry_t *","FAR dq_entry_t *","FAR dq_queue_t *"
+"dq_addfirst","queue.h","","void","FAR dq_entry_t *","dq_queue_t *"
+"dq_addlast","queue.h","","void","FAR dq_entry_t *","dq_queue_t *"
+"dq_rem","queue.h","","void","FAR dq_entry_t *","dq_queue_t *"
+"dq_remfirst","queue.h","","FAR dq_entry_t","dq_queue_t *"
+"dq_remlast","queue.h","","FAR dq_entry_t","dq_queue_t *"
+"ether_ntoa","netinet/ether.h","","FAR char","FAR const struct ether_addr *"
+"fclose","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *"
+"fdopen","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","FAR FILE","int","FAR const char *"
+"fflush","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *"
+"fgetc","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *"
+"fgetpos","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *","FAR fpos_t *"
+"fgets","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","FAR char","FAR char *","int","FAR FILE *"
+"fileno","stdio.h","","int","FAR FILE *"
+"fopen","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","FAR FILE","FAR const char *","FAR const char *"
+"fprintf","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *","FAR const char *","..."
+"fputc","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","int c","FAR FILE *"
+"fputs","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR const char *","FAR FILE *"
+"fread","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","size_t","FAR void *","size_t","size_t","FAR FILE *"
+"fseek","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *","long int","int"
+"fsetpos","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *","FAR fpos_t *"
+"ftell","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","long","FAR FILE *"
+"fwrite","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","size_t","FAR const void *","size_t","size_t","FAR FILE *"
+"getcwd","unistd.h","CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)","FAR char","FAR char *","size_t"
+"getopt","unistd.h","","int","int","FAR char *const[]","FAR const char *"
+"getoptargp","unistd.h","","FAR char *"
+"getoptindp","unistd.h","","int"
+"getoptoptp","unistd.h","","int"
+"gets","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","FAR char","FAR char *"
+"gmtime","time.h","","struct tm","const time_t *"
+"gmtime_r","time.h","","FAR struct tm","FAR const time_t *","FAR struct tm *"
+"htonl","arpa/inet.h","","uint32_t","uint32_t"
+"htons","arpa/inet.h","","uint16_t","uint16_t"
+"imaxabs","stdlib.h","","intmax_t","intmax_t"
+"inet_addr","arpa/inet.h","","in_addr_t","FAR const char "
+"inet_ntoa","arpa/inet.h","!defined(CONFIG_NET_IPv6) && defined(CONFIG_CAN_PASS_STRUCTS)","FAR char","struct in_addr"
+"inet_ntop","arpa/inet.h","","FAR const char","int","FAR const void *","FAR char *","socklen_t"
+"inet_pton","arpa/inet.h","","int","int","FAR const char *","FAR void *"
+"labs","stdlib.h","","long int","long int"
+"lib_dumpbuffer","debug.h","","void","FAR const char *","FAR const uint8_t *","unsigned int"
+"lib_lowprintf","debug.h","","int","FAR const char *","..."
+"lib_rawprintf","debug.h","","int","FAR const char *","..."
+"llabs","stdlib.h","defined(CONFIG_HAVE_LONG_LONG)","long long int","long long int"
+"lldbg","debug.h","!defined(CONFIG_CPP_HAVE_VARARGS) && defined(CONFIG_DEBUG) && defined(CONFIG_ARCH_LOWPUTC)","int","const char *","..."
+"llvdbg","debug.h","!defined(CONFIG_CPP_HAVE_VARARGS) && defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_ARCH_LOWPUTC)","int","const char *","..."
+"match","","","int","const char *","const char *"
+"memccpy","string.h","","FAR void","FAR void *","FAR const void *","int c","size_t"
+"memchr","string.h","","FAR void","FAR const void *","int c","size_t"
+"memcmp","string.h","","int","FAR const void *","FAR const void *","size_t"
+"memcpy","string.h","","FAR void","FAR void *","FAR const void *","size_t"
+"memmove","string.h","","FAR void","FAR void *","FAR const void *","size_t"
+"memset","string.h","","FAR void","FAR void *","int c","size_t"
+"mktime","time.h","","time_t","const struct tm *"
+"mq_getattr","mqueue.h","!defined(CONFIG_DISABLE_MQUEUE)","int","mqd_t","struct mq_attr *"
+"mq_setattr","mqueue.h","!defined(CONFIG_DISABLE_MQUEUE)","int","mqd_t","const struct mq_attr *","struct mq_attr *"
+"ntohl","arpa/inet.h","","uint32_t","uint32_t"
+"ntohs","arpa/inet.h","","uint16_t","uint16_t"
+"perror","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","void","FAR const char *"
+"printf","stdio.h","","int","const char *","..."
+"pthread_attr_destroy","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *"
+"pthread_attr_getinheritsched","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR const pthread_attr_t *","FAR int *"
+"pthread_attr_getschedparam","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *","FAR struct sched_param *"
+"pthread_attr_getschedpolicy","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *","int *"
+"pthread_attr_getstacksize","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *","FAR long *"
+"pthread_attr_init","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *"
+"pthread_attr_setinheritsched","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *","int"
+"pthread_attr_setschedparam","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *","FAR const struct sched_param *"
+"pthread_attr_setschedpolicy","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *","int"
+"pthread_attr_setstacksize","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_attr_t *","long"
+"pthread_barrierattr_destroy","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_barrierattr_t *"
+"pthread_barrierattr_getpshared","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR const pthread_barrierattr_t *","FAR int *"
+"pthread_barrierattr_init","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_barrierattr_t *"
+"pthread_barrierattr_setpshared","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_barrierattr_t *","int"
+"pthread_condattr_destroy","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_condattr_t *"
+"pthread_condattr_init","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_condattr_t *"
+"pthread_mutexattr_destroy","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_mutexattr_t *"
+"pthread_mutexattr_getpshared","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_mutexattr_t *","FAR int *"
+"pthread_mutexattr_gettype","pthread.h","!defined(CONFIG_DISABLE_PTHREAD) && defined(CONFIG_MUTEX_TYPES)","int","const pthread_mutexattr_t *","int *"
+"pthread_mutexattr_init","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_mutexattr_t *"
+"pthread_mutexattr_setpshared","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_mutexattr_t *","int "
+"pthread_mutexattr_settype","pthread.h","!defined(CONFIG_DISABLE_PTHREAD) && defined(CONFIG_MUTEX_TYPES)","int","pthread_mutexattr_t *","int"
+"puts","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR const char *"
+"qsort","stdlib.h","","void","void *","size_t","size_t","int(*)(const void *","const void *)"
+"rand","stdlib.h","","int"
+"readdir_r","dirent.h","CONFIG_NFILE_DESCRIPTORS > 0","int","FAR DIR *","FAR struct dirent *","FAR struct dirent **"
+"rint","","","double_t","double_t"
+"sched_get_priority_max","sched.h","","int","int"
+"sched_get_priority_min","sched.h","","int","int"
+"sem_getvalue","semaphore.h","","int","FAR sem_t *","FAR int *"
+"sem_init","semaphore.h","","int","FAR sem_t *","int","unsigned int"
+"sendfile","sys/sendfile.h","CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0","ssize_t","int","int","off_t","size_t"
+"sigaddset","signal.h","!defined(CONFIG_DISABLE_SIGNALS)","int","FAR sigset_t *","int"
+"sigdelset","signal.h","!defined(CONFIG_DISABLE_SIGNALS)","int","FAR sigset_t *","int"
+"sigemptyset","signal.h","!defined(CONFIG_DISABLE_SIGNALS)","int","FAR sigset_t *"
+"sigfillset","signal.h","!defined(CONFIG_DISABLE_SIGNALS)","int","FAR sigset_t *"
+"sigismember","signal.h","!defined(CONFIG_DISABLE_SIGNALS)","int","FAR const sigset_t *","int"
+"snprintf","stdio.h","","int","FAR char *","size_t","const char *","..."
+"sprintf","stdio.h","","int","FAR char *","const char *","..."
+"sq_addafter","queue.h","","void","FAR sq_entry_t *","FAR sq_entry_t *","FAR sq_queue_t *"
+"sq_addfirst","queue.h","","void","FAR sq_entry_t *","sq_queue_t *"
+"sq_addlast","queue.h","","void","FAR sq_entry_t *","sq_queue_t *"
+"sq_rem","queue.h","","void","FAR sq_entry_t *","sq_queue_t *"
+"sq_remafter","queue.h","","FAR sq_entry_t","FAR sq_entry_t *","sq_queue_t *"
+"sq_remfirst","queue.h","","FAR sq_entry_t","sq_queue_t *"
+"sq_remlast","queue.h","","FAR sq_entry_t","sq_queue_t *"
+"srand","stdlib.h","","void","unsigned int"
+"sscanf","stdio.h","","int","const char *","const char *","..."
+"strcasecmp","string.h","","int","FAR const char *","FAR const char *"
+"strcasestr","string.h","","FAR char","FAR const char *","FAR const char *"
+"strcat","string.h","","FAR char","FAR char *","FAR const char *"
+"strchr","string.h","","FAR char","FAR const char *","int"
+"strcmp","string.h","","int","FAR const char *","FAR const char *"
+"strcpy","string.h","","FAR char","char *","FAR const char *"
+"strcspn","string.h","","size_t","FAR const char *","FAR const char *"
+"strdup","string.h","","FAR char","FAR const char *"
+"strerror","string.h","","FAR const char","int"
+"strftime","time.h","","size_t","char *","size_t","const char *","const struct tm *"
+"strlen","string.h","","size_t","FAR const char *"
+"strncasecmp","string.h","","int","FAR const char *","FAR const char *","size_t"
+"strncat","string.h","","FAR char","FAR char *","FAR const char *","size_t"
+"strncmp","string.h","","int","FAR const char *","FAR const char *","size_t"
+"strncpy","string.h","","FAR char","char *","FAR const char *","size_t"
+"strndup","string.h","","FAR char","FAR const char *","size_t"
+"strnlen","string.h","","size_t","FAR const char *","size_t"
+"strpbrk","string.h","","FAR char","FAR const char *","FAR const char *"
+"strrchr","string.h","","FAR char","FAR const char *","int"
+"strspn","string.h","","size_t","FAR const char *","FAR const char *"
+"strstr","string.h","","FAR char","FAR const char *","FAR const char *"
+"strtod","stdlib.h","","double_t","const char *str","char **endptr"
+"strtok","string.h","","FAR char","FAR char *","FAR const char *"
+"strtok_r","string.h","","FAR char","FAR char *","FAR const char *","FAR char **"
+"strtol","string.h","","long","const char *","char **","int"
+"strtoll","stdlib.h","defined(CONFIG_HAVE_LONG_LONG)","long long","const char *nptr","char **endptr","int base"
+"strtoul","stdlib.h","","unsigned long","const char *","char **","int"
+"strtoull","stdlib.h","defined(CONFIG_HAVE_LONG_LONG)","unsigned long long","const char *","char **","int"
+"tcflush","termios.h","CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_SERIAL_TERMIOS)","int","int","int"
+"tcgetattr","termios.h","CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_SERIAL_TERMIOS)","int","int","FAR struct termios *"
+"tcsetattr","termios.h","CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_SERIAL_TERMIOS)","int","int","int","FAR const struct termios *"
+"telldir","dirent.h","CONFIG_NFILE_DESCRIPTORS > 0","off_t","FAR DIR *"
+"time","time.h","","time_t","time_t *"
+"ub16divub16","fixedmath.h","","ub16_t","ub16_t","ub16_t"
+"ub16mulub16","fixedmath.h","","ub16_t","ub16_t","ub16_t"
+"ub16sqr","fixedmath.h","","ub16_t","ub16_t"
+"ungetc","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","int","FAR FILE *"
+"vdbg","debug.h","!defined(CONFIG_CPP_HAVE_VARARGS) && defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_VERBOSE)","int","const char *","..."
+"vfprintf","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *","const char *","va_list"
+"vprintf","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR const char *","va_list"
+"vsnprintf","stdio.h","","int","FAR char *","size_t","const char *","va_list"
+"vsprintf","stdio.h","","int","FAR char *","const char *","va_list"
+"vsscanf","stdio.h","","int","char *","const char *","va_list"
diff --git a/nuttx/lib/lib_internal.h b/nuttx/lib/lib_internal.h
new file mode 100644
index 000000000..5da0ac924
--- /dev/null
+++ b/nuttx/lib/lib_internal.h
@@ -0,0 +1,211 @@
+/****************************************************************************
+ * lib/lib_internal.h
+ *
+ *   Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __LIB_LIB_INTERNAL_H
+#define __LIB_LIB_INTERNAL_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <limits.h>
+#include <semaphore.h>
+
+#include <nuttx/streams.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+/* This configuration directory is used in environment variable processing
+ * when we need to reference the user's home directory.  There are no user
+ * directories in NuttX so, by default, this always refers to the root
+ * directory.
+ */
+
+#ifndef CONFIG_LIB_HOMEDIR
+# define CONFIG_LIB_HOMEDIR "/"
+#endif
+
+/* If C std I/O buffering is not supported, then we don't need its semaphore
+ * protection.
+ */
+
+#if CONFIG_STDIO_BUFFER_SIZE <= 0
+#  define lib_sem_initialize(s)
+#  define lib_take_semaphore(s)
+#  define lib_give_semaphore(s)
+#endif
+
+/* The NuttX C library an be build in two modes: (1) as a standard, C-libary
+ * that can be used by normal, user-space applications, or (2) as a special,
+ * kernel-mode C-library only used within the OS.  If NuttX is not being
+ * built as separated kernel- and user-space modules, then only the first
+ * mode is supported.
+ */
+
+#if defined(CONFIG_NUTTX_KERNEL) && defined(__KERNEL__)
+#  include <nuttx/kmalloc.h>
+#  define lib_malloc(s)    kmalloc(s)
+#  define lib_zalloc(s)    kzalloc(s)
+#  define lib_realloc(p,s) krealloc(p,s)
+#  define lib_free(p)      kfree(p)
+#else
+#  include <stdlib.h>
+#  define lib_malloc(s)    malloc(s)
+#  define lib_zalloc(s)    zalloc(s)
+#  define lib_realloc(p,s) realloc(p,s)
+#  define lib_free(p)      free(p)
+#endif
+
+#define LIB_BUFLEN_UNKNOWN INT_MAX
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/* Debug output is initially disabled */
+
+#ifdef CONFIG_DEBUG_ENABLE
+extern bool g_dbgenable;
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/* Defined in lib_streamsem.c */
+
+#if CONFIG_NFILE_STREAMS > 0
+void  stream_semtake(FAR struct streamlist *list);
+void  stream_semgive(FAR struct streamlist *list);
+#endif
+
+/* Defined in lib_libnoflush.c */
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+int lib_noflush(FAR struct lib_outstream_s *this);
+#endif
+
+/* Defined in lib_libsprintf.c */
+
+int lib_sprintf(FAR struct lib_outstream_s *obj,
+                       const char *fmt, ...);
+
+/* Defined lib_libvsprintf.c */
+
+int lib_vsprintf(FAR struct lib_outstream_s *obj,
+                 FAR const char *src, va_list ap);
+
+/* Defined lib_rawprintf.c */
+
+int lib_rawvprintf(const char *src, va_list ap);
+
+/* Defined lib_lowprintf.c */
+
+int lib_lowvprintf(const char *src, va_list ap);
+
+/* Defined in lib_dtoa.c */
+
+#ifdef CONFIG_LIBC_FLOATINGPOINT
+char *__dtoa(double d, int mode, int ndigits, int *decpt, int *sign,
+             char **rve);
+#endif
+
+/* Defined in lib_libwrite.c */
+
+ssize_t lib_fwrite(FAR const void *ptr, size_t count, FAR FILE *stream);
+
+/* Defined in lib_libfread.c */
+
+ssize_t lib_fread(FAR void *ptr, size_t count, FAR FILE *stream);
+
+/* Defined in lib_libfflush.c */
+
+ssize_t lib_fflush(FAR FILE *stream, bool bforce);
+
+/* Defined in lib_rdflush.c */
+
+int lib_rdflush(FAR FILE *stream);
+
+/* Defined in lib_wrflush.c */
+
+int lib_wrflush(FAR FILE *stream);
+
+/* Defined in lib_sem.c */
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+void lib_sem_initialize(FAR struct file_struct *stream);
+void lib_take_semaphore(FAR struct file_struct *stream);
+void lib_give_semaphore(FAR struct file_struct *stream);
+#endif
+
+/* Defined in lib_libgetbase.c */
+
+int lib_getbase(const char *nptr, const char **endptr);
+
+/* Defined in lib_skipspace.c */
+
+void lib_skipspace(const char **pptr);
+
+/* Defined in lib_isbasedigit.c */
+
+bool lib_isbasedigit(int ch, int base, int *value);
+
+/* Defined in lib_checkbase.c */
+
+int lib_checkbase(int base, const char **pptr);
+
+/* Defined in lib_expi.c */
+
+#ifdef CONFIG_LIBM
+double lib_expi(size_t n);
+#endif
+
+/* Defined in lib_libsqrtapprox.c */
+
+#ifdef CONFIG_LIBM
+float lib_sqrtapprox(float x);
+#endif
+
+#endif /* __LIB_LIB_INTERNAL_H */
diff --git a/nuttx/lib/libgen/Make.defs b/nuttx/lib/libgen/Make.defs
new file mode 100644
index 000000000..f12645512
--- /dev/null
+++ b/nuttx/lib/libgen/Make.defs
@@ -0,0 +1,43 @@
+############################################################################
+# lib/libgen/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the libgen C files to the build
+
+CSRCS += lib_basename.c lib_dirname.c
+
+# Add the libgen directory to the build
+
+DEPPATH += --dep-path libgen
+VPATH += :libgen
diff --git a/nuttx/lib/libgen/lib_basename.c b/nuttx/lib/libgen/lib_basename.c
new file mode 100644
index 000000000..986c6b852
--- /dev/null
+++ b/nuttx/lib/libgen/lib_basename.c
@@ -0,0 +1,131 @@
+/****************************************************************************
+ * lib/libgen/lib_basename.c
+ *
+ *   Copyright (C) 2007, 2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <libgen.h>
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static char g_retchar[2];
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: basename
+ *
+ * Description:
+ *   basename() extracts the filename component from a null-terminated
+ *   pathname string. In the usual case, basename() returns the component
+ *   following the final '/'. Trailing '/' characters are not counted as
+ *   part of the pathname.
+ *
+ *   If path does not contain a slash, basename() returns a copy of path.
+ *   If path is the string "/", then basename() returns the string "/". If
+ *   path is a NULL pointer or points to an empty string, then basename()
+ *   return the string ".".
+ *
+ *   basename() may modify the contents of path, so copies should be passed.
+ *   basename() may return pointers to statically allocated memory which may
+ *   be overwritten by subsequent calls.
+ *
+ * Parameter:
+ *   path The null-terminated string referring to the path to be decomposed
+ *
+ * Return:
+ *   On success the filename component of the path is returned.
+ *
+ ****************************************************************************/
+
+FAR char *basename(FAR char *path)
+{
+  char *p;
+  int   len;
+  int   ch;
+
+  /* Handle some corner cases */
+
+  if (!path || *path == '\0')
+    {
+      ch = '.';
+      goto out_retchar;
+    }
+
+  /* Check for trailing slash characters */
+
+  len = strlen(path);
+  while (path[len-1] == '/')
+    {
+      /* Remove trailing '/' UNLESS this would make a zero length string */
+      if (len > 1)
+        {
+          path[len-1] = '\0';
+          len--;
+        }
+      else
+        {
+          ch = '/';
+          goto out_retchar;
+        }
+    }
+
+  /* Get the address of the last '/' which is not at the end of the path and,
+   * therefor, must be just before the beginning of the filename component.
+   */
+
+  p = strrchr(path, '/');
+  if (p)
+    {
+      return p + 1;
+    }
+
+  /* There is no '/' in the path */
+
+  return path;
+
+out_retchar:
+  g_retchar[0] = ch;
+  g_retchar[1] = '\0';
+  return g_retchar;
+}
diff --git a/nuttx/lib/libgen/lib_dirname.c b/nuttx/lib/libgen/lib_dirname.c
new file mode 100644
index 000000000..248293a60
--- /dev/null
+++ b/nuttx/lib/libgen/lib_dirname.c
@@ -0,0 +1,144 @@
+/****************************************************************************
+ * lib/libgen/lib_dirname.c
+ *
+ *   Copyright (C) 2007, 2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <libgen.h>
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static char g_retchar[2];
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: dirname
+ *
+ * Description:
+ *   dirname() extracts the directory component from a null-terminated
+ *   pathname string. In the usual case, dirname() returns the string up
+ *   to, but not including, the final '/'. Trailing '/' characters are not
+ *   counted as part of the pathname.
+ *
+ *   If path does not contain a slash, dirname() returns the string ".". If
+ *   path is the string "/", then dirname() returns the string "/". If path
+ *   is a NULL pointer or points to an empty string, then dirname() returns
+ *   the string ".".
+ *
+ *   dirname() may modify the contents of path, so copies should be passed.
+ *   dirname() may return pointers to statically allocated memory which may
+ *   be overwritten by subsequent calls.
+ *
+ * Parameter:
+ *   path The null-terminated string referring to the path to be decomposed
+ *
+ * Return:
+ *   On success the directory component of the path is returned.
+ *
+ ****************************************************************************/
+
+FAR char *dirname(FAR char *path)
+{
+  char *p;
+  int   len;
+  int   ch;
+
+  /* Handle some corner cases */
+
+  if (!path || *path == '\0')
+    {
+      ch = '.';
+      goto out_retchar;
+    }
+
+  /* Check for trailing slash characters */
+
+  len = strlen(path);
+  while (path[len-1] == '/')
+    {
+      /* Remove trailing '/' UNLESS this would make a zero length string */
+      if (len > 1)
+        {
+          path[len-1] = '\0';
+          len--;
+        }
+      else
+        {
+          ch = '/';
+          goto out_retchar;
+        }
+    }
+
+  /* Get the address of the last '/' which is not at the end of the path and,
+   * therefor, must be the end of the directory component.
+   */
+
+  p = strrchr(path, '/');
+  if (p)
+    {
+      /* Handle the case where the only '/' in the string is the at the beginning
+       * of the path.
+       */
+
+      if (p == path)
+        {
+          ch = '/';
+          goto out_retchar;
+        }
+
+      /* No, the directory component is the substring before the '/'. */
+
+      *p = '\0';
+      return path;
+    }
+
+  /* There is no '/' in the path */
+
+  ch = '.';
+
+out_retchar:
+  g_retchar[0] = ch;
+  g_retchar[1] = '\0';
+  return g_retchar;
+}
diff --git a/nuttx/lib/math/Kconfig b/nuttx/lib/math/Kconfig
new file mode 100644
index 000000000..c24bfd53f
--- /dev/null
+++ b/nuttx/lib/math/Kconfig
@@ -0,0 +1,26 @@
+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+config LIBM
+	bool "Math library"
+	default n
+	depends on !ARCH_MATH_H
+	---help---
+		By default, no math library will be provided by NuttX.  In this this case, it
+		is assumed that (1) no math library is required, or (2) you will be using the
+		math.h header file and the libm library provided by your toolchain.
+
+		This is may be a very good choice is possible because your toolchain may have
+		have a highly optimized version of libm.
+
+		Another possibility is that you have a custom, architecture-specific math
+		libary and that the corresponding math.h file resides at arch/<architecture>/include/math.h.
+		The option is selected via ARCH_MATH_H.  If ARCH_MATH_H is selected,then the include/nuttx/math.h
+ 		header file will be copied to include/math.h where it can be used by your applications.
+
+		If ARCH_MATH_H is not defined, then this option can be selected to build a generic,
+		math library built into NuttX.  This math library comes from the Rhombus OS and
+		was written by Nick Johnson.  The Rhombus OS math library port was contributed by
+		Darcy Gong.
diff --git a/nuttx/lib/math/Make.defs b/nuttx/lib/math/Make.defs
new file mode 100644
index 000000000..73d0be6f3
--- /dev/null
+++ b/nuttx/lib/math/Make.defs
@@ -0,0 +1,62 @@
+############################################################################
+# lib/math/Make.defs
+#
+#   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+ifeq ($(CONFIG_LIBM),y)
+
+# Add the floating point math C files to the build
+
+CSRCS += lib_acosf.c lib_asinf.c lib_atan2f.c lib_atanf.c lib_ceilf.c lib_cosf.c
+CSRCS += lib_coshf.c  lib_expf.c lib_fabsf.c lib_floorf.c lib_fmodf.c lib_frexpf.c
+CSRCS += lib_ldexpf.c lib_logf.c lib_log10f.c lib_log2f.c lib_modff.c lib_powf.c
+CSRCS += lib_sinf.c lib_sinhf.c lib_sqrtf.c lib_tanf.c lib_tanhf.c
+
+CSRCS += lib_acos.c lib_asin.c lib_atan.c lib_atan2.c lib_ceil.c lib_cos.c
+CSRCS += lib_cosh.c lib_exp.c lib_fabs.c lib_floor.c lib_fmod.c lib_frexp.c
+CSRCS += lib_ldexp.c lib_log.c lib_log10.c lib_log2.c lib_modf.c lib_pow.c
+CSRCS += lib_sin.c lib_sinh.c lib_sqrt.c lib_tan.c lib_tanh.c
+
+CSRCS += lib_acosl.c lib_asinl.c lib_atan2l.c lib_atanl.c lib_ceill.c lib_cosl.c
+CSRCS += lib_coshl.c lib_expl.c lib_fabsl.c lib_floorl.c lib_fmodl.c lib_frexpl.c
+CSRCS += lib_ldexpl.c lib_logl.c lib_log10l.c lib_log2l.c lib_modfl.c lib_powl.c
+CSRCS += lib_sinl.c lib_sinhl.c lib_sqrtl.c lib_tanl.c lib_tanhl.c
+
+CSRCS += lib_libexpi.c lib_libsqrtapprox.c
+
+# Add the floating point math directory to the build
+
+DEPPATH += --dep-path math
+VPATH += :math
+
+endif
diff --git a/nuttx/lib/math/lib_acos.c b/nuttx/lib/math/lib_acos.c
new file mode 100644
index 000000000..d5ec36b9f
--- /dev/null
+++ b/nuttx/lib/math/lib_acos.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_acos.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double acos(double x)
+{
+  return (M_PI_2 - asin(x));
+}
+#endif
diff --git a/nuttx/lib/math/lib_acosf.c b/nuttx/lib/math/lib_acosf.c
new file mode 100644
index 000000000..e14a73a6e
--- /dev/null
+++ b/nuttx/lib/math/lib_acosf.c
@@ -0,0 +1,41 @@
+/************************************************************************
+ * lib/math/lib_acosf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float acosf(float x)
+{
+  return (M_PI_2 - asinf(x));
+}
diff --git a/nuttx/lib/math/lib_acosl.c b/nuttx/lib/math/lib_acosl.c
new file mode 100644
index 000000000..911330577
--- /dev/null
+++ b/nuttx/lib/math/lib_acosl.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_acos.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double acosl(long double x)
+{
+  return (M_PI_2 - asinl(x));
+}
+#endif
diff --git a/nuttx/lib/math/lib_asin.c b/nuttx/lib/math/lib_asin.c
new file mode 100644
index 000000000..61b953531
--- /dev/null
+++ b/nuttx/lib/math/lib_asin.c
@@ -0,0 +1,69 @@
+/************************************************************************
+ * lib/math/lib_sin.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <float.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double asin(double x)
+{
+  long double y, y_sin, y_cos;
+
+  y = 0;
+
+  while (1)
+    {
+      y_sin = sin(y);
+      y_cos = cos(y);
+
+      if (y > M_PI_2 || y < -M_PI_2)
+        {
+          y = fmod(y, M_PI);
+        }
+
+      if (y_sin + DBL_EPSILON >= x && y_sin - DBL_EPSILON <= x)
+        {
+          break;
+        }
+
+      y = y - (y_sin - x) / y_cos;
+    }
+
+  return y;
+}
+#endif
diff --git a/nuttx/lib/math/lib_asinf.c b/nuttx/lib/math/lib_asinf.c
new file mode 100644
index 000000000..17669a934
--- /dev/null
+++ b/nuttx/lib/math/lib_asinf.c
@@ -0,0 +1,65 @@
+/************************************************************************
+ * lib/math/lib_sinf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+#include <float.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float asinf(float x)
+{
+  long double y, y_sin, y_cos;
+
+  y = 0;
+
+  while (1)
+    {
+      y_sin = sinf(y);
+      y_cos = cosf(y);
+
+      if (y > M_PI_2 || y < -M_PI_2)
+        {
+          y = fmodf(y, M_PI);
+        }
+
+      if (y_sin + FLT_EPSILON >= x && y_sin - FLT_EPSILON <= x)
+        {
+          break;
+        }
+
+      y = y - (y_sin - x) / y_cos;
+    }
+
+  return y;
+}
+
diff --git a/nuttx/lib/math/lib_asinl.c b/nuttx/lib/math/lib_asinl.c
new file mode 100644
index 000000000..dbb2bc3a2
--- /dev/null
+++ b/nuttx/lib/math/lib_asinl.c
@@ -0,0 +1,69 @@
+/************************************************************************
+ * lib/math/lib_sinl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <float.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double asinl(long double x)
+{
+  long double y, y_sin, y_cos;
+
+  y = 0;
+
+  while (1)
+    {
+      y_sin = sinl(y);
+      y_cos = cosl(y);
+
+      if (y > M_PI_2 || y < -M_PI_2)
+        {
+          y = fmodl(y, M_PI);
+        }
+
+      if (y_sin + LDBL_EPSILON >= x && y_sin - LDBL_EPSILON <= x)
+        {
+          break;
+        }
+
+      y = y - (y_sin - x) / y_cos;
+    }
+
+  return y;
+}
+#endif
diff --git a/nuttx/lib/math/lib_atan.c b/nuttx/lib/math/lib_atan.c
new file mode 100644
index 000000000..b4db8fb31
--- /dev/null
+++ b/nuttx/lib/math/lib_atan.c
@@ -0,0 +1,48 @@
+/************************************************************************
+ * lib/math/lib_atan.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double atan(double x)
+{
+  return asin(x / sqrt(x * x + 1));
+}
+#endif
diff --git a/nuttx/lib/math/lib_atan2.c b/nuttx/lib/math/lib_atan2.c
new file mode 100644
index 000000000..82d1f47ec
--- /dev/null
+++ b/nuttx/lib/math/lib_atan2.c
@@ -0,0 +1,86 @@
+/************************************************************************
+ * lib/math/lib_atan2.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double atan2(double y, double x)
+{
+  if (y == 0.0)
+    {
+      if (x >= 0.0)
+        {
+          return 0.0;
+        }
+      else
+        {
+          return M_PI;
+        }
+    }
+  else if (y > 0.0)
+    {
+      if (x == 0.0)
+        {
+          return M_PI_2;
+        }
+      else if (x > 0.0)
+        {
+          return atan(y / x);
+        }
+      else
+        {
+          return M_PI - atan(y / x);
+        }
+    }
+  else
+    {
+      if (x == 0.0)
+        {
+          return M_PI + M_PI_2;
+        }
+      else if (x > 0.0)
+        {
+          return 2 * M_PI - atan(y / x);
+        }
+      else
+        {
+          return M_PI + atan(y / x);
+        }
+    }
+}
+#endif
diff --git a/nuttx/lib/math/lib_atan2f.c b/nuttx/lib/math/lib_atan2f.c
new file mode 100644
index 000000000..a60d32c65
--- /dev/null
+++ b/nuttx/lib/math/lib_atan2f.c
@@ -0,0 +1,81 @@
+/************************************************************************
+ * lib/math/lib_atan2f.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float atan2f(float y, float x)
+{
+  if (y == 0.0)
+    {
+      if (x >= 0.0)
+        {
+          return 0.0;
+        }
+      else
+        {
+          return M_PI;
+        }
+    }
+  else if (y > 0.0)
+    {
+      if (x == 0.0)
+        {
+          return M_PI_2;
+        }
+      else if (x > 0.0)
+        {
+          return atanf(y / x);
+        }
+      else
+        {
+          return M_PI - atanf(y / x);
+        }
+    }
+  else
+    {
+      if (x == 0.0)
+        {
+          return M_PI + M_PI_2;
+        }
+      else if (x > 0.0)
+        {
+          return 2 * M_PI - atanf(y / x);
+        }
+      else
+        {
+          return M_PI + atanf(y / x);
+        }
+    }
+}
diff --git a/nuttx/lib/math/lib_atan2l.c b/nuttx/lib/math/lib_atan2l.c
new file mode 100644
index 000000000..07fcd9669
--- /dev/null
+++ b/nuttx/lib/math/lib_atan2l.c
@@ -0,0 +1,87 @@
+/************************************************************************
+ * lib/math/lib_atan2l.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double atan2l(long double y, long double x)
+{
+
+  if (y == 0.0)
+    {
+      if (x >= 0.0)
+        {
+          return 0.0;
+        }
+      else
+        {
+          return M_PI;
+        }
+    }
+  else if (y > 0.0)
+    {
+      if (x == 0.0)
+        {
+          return M_PI_2;
+        }
+      else if (x > 0.0)
+        {
+          return atanl(y / x);
+        }
+      else
+        {
+          return M_PI - atanl(y / x);
+        }
+    }
+  else
+    {
+      if (x == 0.0)
+        {
+          return M_PI + M_PI_2;
+        }
+      else if (x > 0.0)
+        {
+          return 2 * M_PI - atanl(y / x);
+        }
+      else
+        {
+          return M_PI + atanl(y / x);
+        }
+    }
+}
+#endif
diff --git a/nuttx/lib/math/lib_atanf.c b/nuttx/lib/math/lib_atanf.c
new file mode 100644
index 000000000..7c540dd16
--- /dev/null
+++ b/nuttx/lib/math/lib_atanf.c
@@ -0,0 +1,43 @@
+/************************************************************************
+ * lib/math/lib_atanf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float atanf(float x)
+{
+  return asinf(x / sqrtf(x * x + 1));
+}
diff --git a/nuttx/lib/math/lib_atanl.c b/nuttx/lib/math/lib_atanl.c
new file mode 100644
index 000000000..0fa203098
--- /dev/null
+++ b/nuttx/lib/math/lib_atanl.c
@@ -0,0 +1,48 @@
+/************************************************************************
+ * lib/math/lib_atanl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double atanl(long double x)
+{
+  return asinl(x / sqrtl(x * x + 1));
+}
+#endif
diff --git a/nuttx/lib/math/lib_ceil.c b/nuttx/lib/math/lib_ceil.c
new file mode 100644
index 000000000..0e7602996
--- /dev/null
+++ b/nuttx/lib/math/lib_ceil.c
@@ -0,0 +1,52 @@
+/************************************************************************
+ * lib/math/lib_ceil.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double ceil(double x)
+{
+  modf(x, &x);
+  if (x > 0.0)
+    {
+      x += 1.0;
+    }
+
+  return x;
+}
+#endif
diff --git a/nuttx/lib/math/lib_ceilf.c b/nuttx/lib/math/lib_ceilf.c
new file mode 100644
index 000000000..0721ffc22
--- /dev/null
+++ b/nuttx/lib/math/lib_ceilf.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_ceilf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float ceilf(float x)
+{
+  modff(x, &x);
+  if (x > 0.0)
+    {
+      x += 1.0;
+    }
+
+  return x;
+}
diff --git a/nuttx/lib/math/lib_ceill.c b/nuttx/lib/math/lib_ceill.c
new file mode 100644
index 000000000..a24b56f68
--- /dev/null
+++ b/nuttx/lib/math/lib_ceill.c
@@ -0,0 +1,52 @@
+/************************************************************************
+ * lib/math/lib_ceil;.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double ceill(long double x)
+{
+  modfl(x, &x);
+  if (x > 0.0)
+    {
+      x += 1.0;
+    }
+
+  return x;
+}
+#endif
diff --git a/nuttx/lib/math/lib_cos.c b/nuttx/lib/math/lib_cos.c
new file mode 100644
index 000000000..aa672b855
--- /dev/null
+++ b/nuttx/lib/math/lib_cos.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_cos.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double cos(double x)
+{
+  return sin(x + M_PI_2);
+}
+#endif
diff --git a/nuttx/lib/math/lib_cosf.c b/nuttx/lib/math/lib_cosf.c
new file mode 100644
index 000000000..093a8a002
--- /dev/null
+++ b/nuttx/lib/math/lib_cosf.c
@@ -0,0 +1,41 @@
+/************************************************************************
+ * lib/math/lib_cosf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float cosf(float x)
+{
+  return sinf(x + M_PI_2);
+}
diff --git a/nuttx/lib/math/lib_cosh.c b/nuttx/lib/math/lib_cosh.c
new file mode 100644
index 000000000..1be44d293
--- /dev/null
+++ b/nuttx/lib/math/lib_cosh.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_cosh.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double cosh(double x)
+{
+  x = exp(x);
+  return ((x + (1.0 / x)) / 2.0);
+}
+#endif
diff --git a/nuttx/lib/math/lib_coshf.c b/nuttx/lib/math/lib_coshf.c
new file mode 100644
index 000000000..d5e5ea14d
--- /dev/null
+++ b/nuttx/lib/math/lib_coshf.c
@@ -0,0 +1,42 @@
+/************************************************************************
+ * lib/math/lib_coshf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float coshf(float x)
+{
+  x = expf(x);
+  return ((x + (1.0 / x)) / 2.0);
+}
diff --git a/nuttx/lib/math/lib_coshl.c b/nuttx/lib/math/lib_coshl.c
new file mode 100644
index 000000000..4576b8876
--- /dev/null
+++ b/nuttx/lib/math/lib_coshl.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_coshl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double coshl(long double x)
+{
+  x = expl(x);
+  return ((x + (1.0 / x)) / 2.0);
+}
+#endif
diff --git a/nuttx/lib/math/lib_cosl.c b/nuttx/lib/math/lib_cosl.c
new file mode 100644
index 000000000..25dd86139
--- /dev/null
+++ b/nuttx/lib/math/lib_cosl.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_cosl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double cosl(long double x)
+{
+  return sinl(x + M_PI_2);
+}
+#endif
diff --git a/nuttx/lib/math/lib_exp.c b/nuttx/lib/math/lib_exp.c
new file mode 100644
index 000000000..1e3120453
--- /dev/null
+++ b/nuttx/lib/math/lib_exp.c
@@ -0,0 +1,126 @@
+/************************************************************************
+ * lib/math/lib_exp.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <sys/types.h>
+#include <math.h>
+
+#include "lib_internal.h"
+
+#ifdef CONFIG_HAVE_DOUBLE
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+static double _dbl_inv_fact[] =
+{
+  1.0 / 1.0,                    // 1 / 0!
+  1.0 / 1.0,                    // 1 / 1!
+  1.0 / 2.0,                    // 1 / 2!
+  1.0 / 6.0,                    // 1 / 3!
+  1.0 / 24.0,                   // 1 / 4!
+  1.0 / 120.0,                  // 1 / 5!
+  1.0 / 720.0,                  // 1 / 6!
+  1.0 / 5040.0,                 // 1 / 7!
+  1.0 / 40320.0,                // 1 / 8!
+  1.0 / 362880.0,               // 1 / 9!
+  1.0 / 3628800.0,              // 1 / 10!
+  1.0 / 39916800.0,             // 1 / 11!
+  1.0 / 479001600.0,            // 1 / 12!
+  1.0 / 6227020800.0,           // 1 / 13!
+  1.0 / 87178291200.0,          // 1 / 14!
+  1.0 / 1307674368000.0,        // 1 / 15!
+  1.0 / 20922789888000.0,       // 1 / 16!
+  1.0 / 355687428096000.0,      // 1 / 17!
+  1.0 / 6402373705728000.0,     // 1 / 18!
+};
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+double exp(double x)
+{
+  size_t int_part;
+  bool invert;
+  double value;
+  double x0;
+  size_t i;
+
+  if (x == 0)
+    {
+      return 1;
+    }
+  else if (x < 0)
+    {
+      invert = true;
+      x = -x;
+    }
+  else
+    {
+      invert = false;
+    }
+
+  /* Extract integer component */
+
+  int_part = (size_t) x;
+
+  /* Set x to fractional component */
+
+  x -= (double)int_part;
+
+  /* Perform Taylor series approximation with nineteen terms */
+
+  value = 0.0;
+  x0 = 1.0;
+  for (i = 0; i < 19; i++)
+    {
+      value += x0 * _dbl_inv_fact[i];
+      x0 *= x;
+    }
+
+  /* Multiply by exp of the integer component */
+
+  value *= lib_expi(int_part);
+
+  if (invert)
+    {
+      return (1.0 / value);
+    }
+  else
+    {
+      return value;
+    }
+}
+#endif
diff --git a/nuttx/lib/math/lib_expf.c b/nuttx/lib/math/lib_expf.c
new file mode 100644
index 000000000..eac4641c6
--- /dev/null
+++ b/nuttx/lib/math/lib_expf.c
@@ -0,0 +1,112 @@
+/************************************************************************
+ * lib/math/lib_expf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <sys/types.h>
+#include <math.h>
+
+#include "lib_internal.h"
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+static float _flt_inv_fact[] =
+{
+  1.0 / 1.0,                    // 1/0!
+  1.0 / 1.0,                    // 1/1!
+  1.0 / 2.0,                    // 1/2!
+  1.0 / 6.0,                    // 1/3!
+  1.0 / 24.0,                   // 1/4!
+  1.0 / 120.0,                  // 1/5!
+  1.0 / 720.0,                  // 1/6!
+  1.0 / 5040.0,                 // 1/7!
+  1.0 / 40320.0,                // 1/8!
+  1.0 / 362880.0,               // 1/9!
+  1.0 / 3628800.0,              // 1/10!
+};
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float expf(float x)
+{
+  size_t int_part;
+  bool invert;
+  float value;
+  float x0;
+  size_t i;
+
+  if (x == 0)
+    {
+      return 1;
+    }
+  else if (x < 0)
+    {
+      invert = true;
+      x = -x;
+    }
+  else
+    {
+      invert = false;
+    }
+
+  /* Extract integer component */
+
+  int_part = (size_t) x;
+
+  /* set x to fractional component */
+
+  x -= (float)int_part;
+
+  /* Perform Taylor series approximation with eleven terms */
+
+  value = 0.0;
+  x0 = 1.0;
+  for (i = 0; i < 10; i++)
+    {
+      value += x0 * _flt_inv_fact[i];
+      x0 *= x;
+    }
+
+  /* Multiply by exp of the integer component */
+
+  value *= lib_expi(int_part);
+
+  if (invert)
+    {
+      return (1.0 / value);
+    }
+  else
+    {
+      return value;
+    }
+}
diff --git a/nuttx/lib/math/lib_expl.c b/nuttx/lib/math/lib_expl.c
new file mode 100644
index 000000000..053103c9b
--- /dev/null
+++ b/nuttx/lib/math/lib_expl.c
@@ -0,0 +1,126 @@
+/************************************************************************
+ * lib/math/lib_expl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <sys/types.h>
+#include <math.h>
+
+#include "lib_internal.h"
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+static long double _ldbl_inv_fact[] =
+{
+  1.0 / 1.0,                    // 1 / 0!
+  1.0 / 1.0,                    // 1 / 1!
+  1.0 / 2.0,                    // 1 / 2!
+  1.0 / 6.0,                    // 1 / 3!
+  1.0 / 24.0,                   // 1 / 4!
+  1.0 / 120.0,                  // 1 / 5!
+  1.0 / 720.0,                  // 1 / 6!
+  1.0 / 5040.0,                 // 1 / 7!
+  1.0 / 40320.0,                // 1 / 8!
+  1.0 / 362880.0,               // 1 / 9!
+  1.0 / 3628800.0,              // 1 / 10!
+  1.0 / 39916800.0,             // 1 / 11!
+  1.0 / 479001600.0,            // 1 / 12!
+  1.0 / 6227020800.0,           // 1 / 13!
+  1.0 / 87178291200.0,          // 1 / 14!
+  1.0 / 1307674368000.0,        // 1 / 15!
+  1.0 / 20922789888000.0,       // 1 / 16!
+  1.0 / 355687428096000.0,      // 1 / 17!
+  1.0 / 6402373705728000.0,     // 1 / 18!
+};
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+long double expl(long double x)
+{
+  size_t int_part;
+  bool invert;
+  long double value;
+  long double x0;
+  size_t i;
+
+  if (x == 0)
+    {
+      return 1;
+    }
+  else if (x < 0)
+    {
+      invert = true;
+      x = -x;
+    }
+  else
+    {
+      invert = false;
+    }
+
+  /* Extract integer component */
+
+  int_part = (size_t) x;
+
+  /* Set x to fractional component */
+
+  x -= (long double)int_part;
+
+  /* Perform Taylor series approximation with nineteen terms */
+
+  value = 0.0;
+  x0 = 1.0;
+  for (i = 0; i < 19; i++)
+    {
+      value += x0 * _ldbl_inv_fact[i];
+      x0 *= x;
+    }
+
+  /* Multiply by exp of the integer component */
+
+  value *= lib_expi(int_part);
+
+  if (invert)
+    {
+      return (1.0 / value);
+    }
+  else
+    {
+      return value;
+    }
+}
+#endif
diff --git a/nuttx/lib/math/lib_fabs.c b/nuttx/lib/math/lib_fabs.c
new file mode 100644
index 000000000..ff99ceb64
--- /dev/null
+++ b/nuttx/lib/math/lib_fabs.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_fabs.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double fabs(double x)
+{
+  return ((x < 0) ? -x : x);
+}
+#endif
diff --git a/nuttx/lib/math/lib_fabsf.c b/nuttx/lib/math/lib_fabsf.c
new file mode 100644
index 000000000..0ea186ca0
--- /dev/null
+++ b/nuttx/lib/math/lib_fabsf.c
@@ -0,0 +1,41 @@
+/************************************************************************
+ * lib/math/lib_fabsf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float fabsf(float x)
+{
+  return ((x < 0) ? -x : x);
+}
diff --git a/nuttx/lib/math/lib_fabsl.c b/nuttx/lib/math/lib_fabsl.c
new file mode 100644
index 000000000..5313d897d
--- /dev/null
+++ b/nuttx/lib/math/lib_fabsl.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_fabsl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double fabsl(long double x)
+{
+  return ((x < 0) ? -x : x);
+}
+#endif
diff --git a/nuttx/lib/math/lib_floor.c b/nuttx/lib/math/lib_floor.c
new file mode 100644
index 000000000..f0c4477a0
--- /dev/null
+++ b/nuttx/lib/math/lib_floor.c
@@ -0,0 +1,52 @@
+/************************************************************************
+ * lib/math/lib_floor.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double floor(double x)
+{
+  modf(x, &x);
+  if (x < 0.0)
+    {
+      x -= 1.0;
+    }
+
+  return x;
+}
+#endif
diff --git a/nuttx/lib/math/lib_floorf.c b/nuttx/lib/math/lib_floorf.c
new file mode 100644
index 000000000..2becb5fac
--- /dev/null
+++ b/nuttx/lib/math/lib_floorf.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_floorf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float floorf(float x)
+{
+  modff(x, &x);
+  if (x < 0.0)
+    {
+      x -= 1.0;
+    }
+
+  return x;
+}
diff --git a/nuttx/lib/math/lib_floorl.c b/nuttx/lib/math/lib_floorl.c
new file mode 100644
index 000000000..e38ce80ed
--- /dev/null
+++ b/nuttx/lib/math/lib_floorl.c
@@ -0,0 +1,52 @@
+/************************************************************************
+ * lib/math/lib_floorl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double floorl(long double x)
+{
+  modfl(x, &x);
+  if (x < 0.0)
+    {
+      x -= 1.0;
+    }
+
+  return x;
+}
+#endif
diff --git a/nuttx/lib/math/lib_fmod.c b/nuttx/lib/math/lib_fmod.c
new file mode 100644
index 000000000..939e7e18a
--- /dev/null
+++ b/nuttx/lib/math/lib_fmod.c
@@ -0,0 +1,52 @@
+/************************************************************************
+ * lib/math/lib_fmod.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double fmod(double x, double div)
+{
+  double n0;
+
+  x /= div;
+  x = modf(x, &n0);
+  x *= div;
+
+  return x;
+}
+#endif
diff --git a/nuttx/lib/math/lib_fmodf.c b/nuttx/lib/math/lib_fmodf.c
new file mode 100644
index 000000000..085786f17
--- /dev/null
+++ b/nuttx/lib/math/lib_fmodf.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_fmodf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float fmodf(float x, float div)
+{
+  float n0;
+
+  x /= div;
+  x = modff(x, &n0);
+  x *= div;
+
+  return x;
+}
diff --git a/nuttx/lib/math/lib_fmodl.c b/nuttx/lib/math/lib_fmodl.c
new file mode 100644
index 000000000..51c5e95ec
--- /dev/null
+++ b/nuttx/lib/math/lib_fmodl.c
@@ -0,0 +1,52 @@
+/************************************************************************
+ * lib/math/lib_fmodl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double fmodl(long double x, long double div)
+{
+  long double n0;
+
+  x /= div;
+  x = modfl(x, &n0);
+  x *= div;
+
+  return x;
+}
+#endif
diff --git a/nuttx/lib/math/lib_frexp.c b/nuttx/lib/math/lib_frexp.c
new file mode 100644
index 000000000..56feee863
--- /dev/null
+++ b/nuttx/lib/math/lib_frexp.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_frexp.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double frexp(double x, int *exponent)
+{
+  *exponent = (int)ceil(log2(x));
+  return x / ldexp(1.0, *exponent);
+}
+#endif
diff --git a/nuttx/lib/math/lib_frexpf.c b/nuttx/lib/math/lib_frexpf.c
new file mode 100644
index 000000000..1fb0df3d8
--- /dev/null
+++ b/nuttx/lib/math/lib_frexpf.c
@@ -0,0 +1,42 @@
+/************************************************************************
+ * lib/math/lib_frexpf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float frexpf(float x, int *exponent)
+{
+  *exponent = (int)ceilf(log2f(x));
+  return x / ldexpf(1.0, *exponent);
+}
diff --git a/nuttx/lib/math/lib_frexpl.c b/nuttx/lib/math/lib_frexpl.c
new file mode 100644
index 000000000..87708ad86
--- /dev/null
+++ b/nuttx/lib/math/lib_frexpl.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_frexpl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double frexpl(long double x, int *exponent)
+{
+  *exponent = (int)ceill(log2(x));
+  return x / ldexpl(1.0, *exponent);
+}
+#endif
diff --git a/nuttx/lib/math/lib_ldexp.c b/nuttx/lib/math/lib_ldexp.c
new file mode 100644
index 000000000..4c7b2b721
--- /dev/null
+++ b/nuttx/lib/math/lib_ldexp.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_ldexp.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double ldexp(double x, int n)
+{
+  return (x * pow(2.0, (double)n));
+}
+#endif
diff --git a/nuttx/lib/math/lib_ldexpf.c b/nuttx/lib/math/lib_ldexpf.c
new file mode 100644
index 000000000..c61d633d5
--- /dev/null
+++ b/nuttx/lib/math/lib_ldexpf.c
@@ -0,0 +1,41 @@
+/************************************************************************
+ * lib/math/lib_ldexpf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float ldexpf(float x, int n)
+{
+  return (x * powf(2.0, (float)n));
+}
diff --git a/nuttx/lib/math/lib_ldexpl.c b/nuttx/lib/math/lib_ldexpl.c
new file mode 100644
index 000000000..b9a0f4a86
--- /dev/null
+++ b/nuttx/lib/math/lib_ldexpl.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_ldexpl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double ldexpl(long double x, int n)
+{
+  return (x * powl(2.0, (long double)n));
+}
+#endif
diff --git a/nuttx/lib/math/lib_libexpi.c b/nuttx/lib/math/lib_libexpi.c
new file mode 100644
index 000000000..1ec947a71
--- /dev/null
+++ b/nuttx/lib/math/lib_libexpi.c
@@ -0,0 +1,103 @@
+/************************************************************************
+ * lib/math/lib_libexpi.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <sys/types.h>
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************/
+
+#define M_E2    (M_E * M_E)
+#define M_E4    (M_E2 * M_E2)
+#define M_E8    (M_E4 * M_E4)
+#define M_E16   (M_E8 * M_E8)
+#define M_E32   (M_E16 * M_E16)
+#define M_E64   (M_E32 * M_E32)
+#define M_E128  (M_E64 * M_E64)
+#define M_E256  (M_E128 * M_E128)
+#define M_E512  (M_E256 * M_E256)
+#define M_E1024 (M_E512 * M_E512)
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+static double _expi_square_tbl[11] =
+{
+  M_E,                          // e^1
+  M_E2,                         // e^2
+  M_E4,                         // e^4
+  M_E8,                         // e^8
+  M_E16,                        // e^16
+  M_E32,                        // e^32
+  M_E64,                        // e^64
+  M_E128,                       // e^128
+  M_E256,                       // e^256
+  M_E512,                       // e^512
+  M_E1024,                      // e^1024
+};
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+double lib_expi(size_t n)
+{
+  size_t i;
+  double val;
+
+  if (n > 1024)
+    {
+      return INFINITY;
+    }
+
+  val = 1.0;
+
+  for (i = 0; n; i++)
+    {
+      if (n & (1 << i))
+        {
+          n   &= ~(1 << i);
+          val *= _expi_square_tbl[i];
+        }
+    }
+
+  return val;
+}
+
diff --git a/nuttx/lib/math/lib_libsqrtapprox.c b/nuttx/lib/math/lib_libsqrtapprox.c
new file mode 100644
index 000000000..5c556c3a0
--- /dev/null
+++ b/nuttx/lib/math/lib_libsqrtapprox.c
@@ -0,0 +1,50 @@
+/************************************************************************
+ * lib/math/lib_libsqrtapprox.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <stdint.h>
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float lib_sqrtapprox(float x)
+{
+  int32_t i;
+
+  /* Floats + bit manipulation = +inf fun! */
+
+  i = *((int32_t *) & x);
+  i = 0x1fc00000 + (i >> 1);
+  x = *((float *)&i);
+
+  return x;
+}
diff --git a/nuttx/lib/math/lib_log.c b/nuttx/lib/math/lib_log.c
new file mode 100644
index 000000000..1350ba4fe
--- /dev/null
+++ b/nuttx/lib/math/lib_log.c
@@ -0,0 +1,82 @@
+/************************************************************************
+ * lib/math/lib_log.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <float.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double log(double x)
+{
+  double y, y_old, ey, epsilon;
+
+  y = 0.0;
+  y_old = 1.0;
+  epsilon = DBL_EPSILON;
+
+  while (y > y_old + epsilon || y < y_old - epsilon)
+    {
+      y_old = y;
+      ey = exp(y);
+      y -= (ey - x) / ey;
+
+      if (y > 700.0)
+        {
+          y = 700.0;
+        }
+
+      if (y < -700.0)
+        {
+          y = -700.0;
+        }
+
+      epsilon = (fabs(y) > 1.0) ? fabs(y) * DBL_EPSILON : DBL_EPSILON;
+    }
+
+  if (y == 700.0)
+    {
+      return INFINITY;
+    }
+
+  if (y == -700.0)
+    {
+      return INFINITY;
+    }
+
+  return y;
+}
+#endif
diff --git a/nuttx/lib/math/lib_log10.c b/nuttx/lib/math/lib_log10.c
new file mode 100644
index 000000000..47854fca4
--- /dev/null
+++ b/nuttx/lib/math/lib_log10.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_log10.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double log10(double x)
+{
+  return (log(x) / M_LN10);
+}
+#endif
diff --git a/nuttx/lib/math/lib_log10f.c b/nuttx/lib/math/lib_log10f.c
new file mode 100644
index 000000000..651071920
--- /dev/null
+++ b/nuttx/lib/math/lib_log10f.c
@@ -0,0 +1,41 @@
+/************************************************************************
+ * lib/math/lib_log10f.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float log10f(float x)
+{
+  return (logf(x) / M_LN10);
+}
diff --git a/nuttx/lib/math/lib_log10l.c b/nuttx/lib/math/lib_log10l.c
new file mode 100644
index 000000000..65892262a
--- /dev/null
+++ b/nuttx/lib/math/lib_log10l.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_log10l.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double log10l(long double x)
+{
+  return (logl(x) / M_LN10);
+}
+#endif
diff --git a/nuttx/lib/math/lib_log2.c b/nuttx/lib/math/lib_log2.c
new file mode 100644
index 000000000..0aa1e8010
--- /dev/null
+++ b/nuttx/lib/math/lib_log2.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_log2.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double log2(double x)
+{
+  return (log(x) / M_LN2);
+}
+#endif
diff --git a/nuttx/lib/math/lib_log2f.c b/nuttx/lib/math/lib_log2f.c
new file mode 100644
index 000000000..e160ca59e
--- /dev/null
+++ b/nuttx/lib/math/lib_log2f.c
@@ -0,0 +1,41 @@
+/************************************************************************
+ * lib/math/lib_log2f.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float log2f(float x)
+{
+  return (logf(x) / M_LN2);
+}
diff --git a/nuttx/lib/math/lib_log2l.c b/nuttx/lib/math/lib_log2l.c
new file mode 100644
index 000000000..21d26d4d7
--- /dev/null
+++ b/nuttx/lib/math/lib_log2l.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_log2l.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double log2l(long double x)
+{
+  return (logl(x) / M_LN2);
+}
+#endif
diff --git a/nuttx/lib/math/lib_logf.c b/nuttx/lib/math/lib_logf.c
new file mode 100644
index 000000000..1d31aa0c0
--- /dev/null
+++ b/nuttx/lib/math/lib_logf.c
@@ -0,0 +1,77 @@
+/************************************************************************
+ * lib/math/lib_logf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+#include <float.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float logf(float x)
+{
+  float y, y_old, ey, epsilon;
+
+  y = 0.0;
+  y_old = 1.0;
+  epsilon = FLT_EPSILON;
+
+  while (y > y_old + epsilon || y < y_old - epsilon)
+    {
+      y_old = y;
+      ey = exp(y);
+      y -= (ey - x) / ey;
+
+      if (y > 700.0)
+        {
+          y = 700.0;
+        }
+
+      if (y < -700.0)
+        {
+          y = -700.0;
+        }
+
+      epsilon = (fabs(y) > 1.0) ? fabs(y) * FLT_EPSILON : FLT_EPSILON;
+    }
+
+  if (y == 700.0)
+    {
+      return INFINITY;
+    }
+
+  if (y == -700.0)
+    {
+      return INFINITY;
+    }
+
+  return y;
+}
diff --git a/nuttx/lib/math/lib_logl.c b/nuttx/lib/math/lib_logl.c
new file mode 100644
index 000000000..577f9cee2
--- /dev/null
+++ b/nuttx/lib/math/lib_logl.c
@@ -0,0 +1,80 @@
+/************************************************************************
+ * lib/math/lib_lol.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <float.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double logl(long double x)
+{
+  long double y, y_old, ey, epsilon;
+
+  y = 0.0;
+  y_old = 1.0;
+  epsilon = LDBL_EPSILON;
+
+  while (y > y_old + epsilon || y < y_old - epsilon)
+    {
+      y_old = y;
+      ey = expl(y);
+      y -= (ey - x) / ey;
+
+      if (y > 700.0)
+        {
+          y = 700.0;
+        }
+
+      if (y < -700.0)
+        {
+          y = -700.0;
+        }
+    }
+
+  if (y == 700.0)
+    {
+      return INFINITY;
+    }
+
+  if (y == -700.0)
+    {
+      return INFINITY;
+    }
+
+  return y;
+}
+#endif
diff --git a/nuttx/lib/math/lib_modf.c b/nuttx/lib/math/lib_modf.c
new file mode 100644
index 000000000..9dc6284c2
--- /dev/null
+++ b/nuttx/lib/math/lib_modf.c
@@ -0,0 +1,58 @@
+/************************************************************************
+ * lib/math/lib_modf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <stdint.h>
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double modf(double x, double *iptr)
+{
+  if (fabs(x) >= 4503599627370496.0)
+    {
+      *iptr = x;
+      return 0.0;
+    }
+  else if (fabs(x) < 1.0)
+    {
+      *iptr = 0.0;
+      return x;
+    }
+  else
+    {
+      *iptr = (double)(int64_t) x;
+      return (x - *iptr);
+    }
+}
+#endif
diff --git a/nuttx/lib/math/lib_modff.c b/nuttx/lib/math/lib_modff.c
new file mode 100644
index 000000000..4eec2ae17
--- /dev/null
+++ b/nuttx/lib/math/lib_modff.c
@@ -0,0 +1,55 @@
+/************************************************************************
+ * lib/math/lib_modff.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float modff(float x, float *iptr)
+{
+  if (fabsf(x) >= 8388608.0)
+    {
+      *iptr = x;
+      return 0.0;
+    }
+  else if (fabs(x) < 1.0)
+    {
+      *iptr = 0.0;
+      return x;
+    }
+  else
+    {
+      *iptr = (float)(int)x;
+      return (x - *iptr);
+    }
+}
diff --git a/nuttx/lib/math/lib_modfl.c b/nuttx/lib/math/lib_modfl.c
new file mode 100644
index 000000000..3b04571f3
--- /dev/null
+++ b/nuttx/lib/math/lib_modfl.c
@@ -0,0 +1,61 @@
+/************************************************************************
+ * lib/math/lib_modfl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <stdint.h>
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double modfl(long double x, long double *iptr)
+{
+  if (fabs(x) >= 4503599627370496.0)
+    {
+      *iptr = x;
+      return 0.0;
+    }
+  else if (fabs(x) < 1.0)
+    {
+      *iptr = 0.0;
+      return x;
+    }
+  else
+    {
+      *iptr = (long double)(int64_t) x;
+      return (x - *iptr);
+    }
+}
+#endif
diff --git a/nuttx/lib/math/lib_pow.c b/nuttx/lib/math/lib_pow.c
new file mode 100644
index 000000000..af0a55d32
--- /dev/null
+++ b/nuttx/lib/math/lib_pow.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_pow.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double pow(double b, double e)
+{
+  return exp(e * log(b));
+}
+#endif
diff --git a/nuttx/lib/math/lib_powf.c b/nuttx/lib/math/lib_powf.c
new file mode 100644
index 000000000..a43f9cf82
--- /dev/null
+++ b/nuttx/lib/math/lib_powf.c
@@ -0,0 +1,41 @@
+/************************************************************************
+ * lib/math/lib_powf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float powf(float b, float e)
+{
+  return expf(e * logf(b));
+}
diff --git a/nuttx/lib/math/lib_powl.c b/nuttx/lib/math/lib_powl.c
new file mode 100644
index 000000000..f5fbf042e
--- /dev/null
+++ b/nuttx/lib/math/lib_powl.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_powl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double powl(long double b, long double e)
+{
+  return expl(e * logl(b));
+}
+#endif
diff --git a/nuttx/lib/math/lib_sin.c b/nuttx/lib/math/lib_sin.c
new file mode 100644
index 000000000..c04d6b88b
--- /dev/null
+++ b/nuttx/lib/math/lib_sin.c
@@ -0,0 +1,114 @@
+/************************************************************************
+ * lib/math/lib_sin.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <sys/types.h>
+#include <math.h>
+
+#ifdef CONFIG_HAVE_DOUBLE
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+static double _dbl_inv_fact[] =
+{
+  1.0 / 1.0,                    // 1 / 1!
+  1.0 / 6.0,                    // 1 / 3!
+  1.0 / 120.0,                  // 1 / 5!
+  1.0 / 5040.0,                 // 1 / 7!
+  1.0 / 362880.0,               // 1 / 9!
+  1.0 / 39916800.0,             // 1 / 11!
+  1.0 / 6227020800.0,           // 1 / 13!
+  1.0 / 1307674368000.0,        // 1 / 15!
+  1.0 / 355687428096000.0,      // 1 / 17!
+  1.0 / 121645100408832000.0,   // 1 / 19!
+};
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+double sin(double x)
+{
+  double x_squared;
+  double sin_x;
+  size_t i;
+
+  /* Move x to [-pi, pi) */
+
+  x = fmod(x, 2 * M_PI);
+  if (x >= M_PI)
+    {
+      x -= 2 * M_PI;
+    }
+
+  if (x < -M_PI)
+    {
+      x += 2 * M_PI;
+    }
+
+  /* Move x to [-pi/2, pi/2) */
+
+  if (x >= M_PI_2)
+    {
+      x = M_PI - x;
+    }
+
+  if (x < -M_PI_2)
+    {
+      x = -M_PI - x;
+    }
+
+  x_squared = x * x;
+  sin_x = 0.0;
+
+  /* Perform Taylor series approximation for sin(x) with ten terms */
+
+  for (i = 0; i < 10; i++)
+    {
+      if (i % 2 == 0)
+        {
+          sin_x += x * _dbl_inv_fact[i];
+        }
+      else
+        {
+          sin_x -= x * _dbl_inv_fact[i];
+        }
+
+      x *= x_squared;
+    }
+
+  return sin_x;
+}
+#endif
diff --git a/nuttx/lib/math/lib_sinf.c b/nuttx/lib/math/lib_sinf.c
new file mode 100644
index 000000000..e298bbba4
--- /dev/null
+++ b/nuttx/lib/math/lib_sinf.c
@@ -0,0 +1,104 @@
+/************************************************************************
+ * lib/math/lib_sinf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <sys/types.h>
+#include <math.h>
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+static float _flt_inv_fact[] =
+{
+  1.0 / 1.0,                    // 1 / 1!
+  1.0 / 6.0,                    // 1 / 3!
+  1.0 / 120.0,                  // 1 / 5!
+  1.0 / 5040.0,                 // 1 / 7!
+  1.0 / 362880.0,               // 1 / 9!
+  1.0 / 39916800.0,             // 1 / 11!
+};
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float sinf(float x)
+{
+  float x_squared;
+  float sin_x;
+  size_t i;
+
+  /* Move x to [-pi, pi) */
+
+  x = fmodf(x, 2 * M_PI);
+  if (x >= M_PI)
+    {
+      x -= 2 * M_PI;
+    }
+
+  if (x < -M_PI)
+    {
+      x += 2 * M_PI;
+    }
+
+  /* Move x to [-pi/2, pi/2) */
+
+  if (x >= M_PI_2)
+    {
+      x = M_PI - x;
+    }
+
+  if (x < -M_PI_2)
+    {
+      x = -M_PI - x;
+    }
+
+  x_squared = x * x;
+  sin_x = 0.0;
+
+  /* Perform Taylor series approximation for sin(x) with six terms */
+
+  for (i = 0; i < 6; i++)
+    {
+      if (i % 2 == 0)
+        {
+          sin_x += x * _flt_inv_fact[i];
+        }
+      else
+        {
+          sin_x -= x * _flt_inv_fact[i];
+        }
+
+      x *= x_squared;
+    }
+
+  return sin_x;
+}
diff --git a/nuttx/lib/math/lib_sinh.c b/nuttx/lib/math/lib_sinh.c
new file mode 100644
index 000000000..f33852433
--- /dev/null
+++ b/nuttx/lib/math/lib_sinh.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_sinh.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double sinh(double x)
+{
+  x = exp(x);
+  return ((x - (1.0 / x)) / 2.0);
+}
+#endif
diff --git a/nuttx/lib/math/lib_sinhf.c b/nuttx/lib/math/lib_sinhf.c
new file mode 100644
index 000000000..e15cb14dc
--- /dev/null
+++ b/nuttx/lib/math/lib_sinhf.c
@@ -0,0 +1,42 @@
+/************************************************************************
+ * lib/math/lib_sinhf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float sinhf(float x)
+{
+  x = expf(x);
+  return ((x - (1.0 / x)) / 2.0);
+}
diff --git a/nuttx/lib/math/lib_sinhl.c b/nuttx/lib/math/lib_sinhl.c
new file mode 100644
index 000000000..b0fea2914
--- /dev/null
+++ b/nuttx/lib/math/lib_sinhl.c
@@ -0,0 +1,47 @@
+/************************************************************************
+ * lib/math/lib_sinhl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double sinhl(long double x)
+{
+  x = expl(x);
+  return ((x - (1.0 / x)) / 2.0);
+}
+#endif
diff --git a/nuttx/lib/math/lib_sinl.c b/nuttx/lib/math/lib_sinl.c
new file mode 100644
index 000000000..a69b548cb
--- /dev/null
+++ b/nuttx/lib/math/lib_sinl.c
@@ -0,0 +1,114 @@
+/************************************************************************
+ * lib/math/lib_sinl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <sys/types.h>
+#include <math.h>
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+static long double _ldbl_inv_fact[] =
+{
+  1.0 / 1.0,                    // 1 / 1!
+  1.0 / 6.0,                    // 1 / 3!
+  1.0 / 120.0,                  // 1 / 5!
+  1.0 / 5040.0,                 // 1 / 7!
+  1.0 / 362880.0,               // 1 / 9!
+  1.0 / 39916800.0,             // 1 / 11!
+  1.0 / 6227020800.0,           // 1 / 13!
+  1.0 / 1307674368000.0,        // 1 / 15!
+  1.0 / 355687428096000.0,      // 1 / 17!
+  1.0 / 121645100408832000.0,   // 1 / 19!
+};
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+long double sinl(long double x)
+{
+  long double x_squared;
+  long double sin_x;
+  size_t i;
+
+  /* Move x to [-pi, pi) */
+
+  x = fmodl(x, 2 * M_PI);
+  if (x >= M_PI)
+    {
+      x -= 2 * M_PI;
+    }
+
+  if (x < -M_PI)
+    {
+      x += 2 * M_PI;
+    }
+
+  /* Move x to [-pi/2, pi/2) */
+
+  if (x >= M_PI_2)
+    {
+      x = M_PI - x;
+    }
+
+  if (x < -M_PI_2)
+    {
+      x = -M_PI - x;
+    }
+
+  x_squared = x * x;
+  sin_x = 0.0;
+
+  /* Perform Taylor series approximation for sin(x) with ten terms */
+
+  for (i = 0; i < 10; i++)
+    {
+      if (i % 2 == 0)
+        {
+          sin_x += x * _ldbl_inv_fact[i];
+        }
+      else
+        {
+          sin_x -= x * _ldbl_inv_fact[i];
+        }
+
+      x *= x_squared;
+    }
+
+  return sin_x;
+}
+#endif
diff --git a/nuttx/lib/math/lib_sqrt.c b/nuttx/lib/math/lib_sqrt.c
new file mode 100644
index 000000000..d77997f7c
--- /dev/null
+++ b/nuttx/lib/math/lib_sqrt.c
@@ -0,0 +1,99 @@
+/************************************************************************
+ * lib/math/lib_sqrt.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double sqrt(double x)
+{
+  long double y, y1;
+
+  if (x < 0.0)
+    {
+      errno = EDOM;
+      return NAN;
+    }
+
+  if (isnan(x))
+    {
+      return NAN;
+    }
+
+  if (isinf(x))
+    {
+      return INFINITY;
+    }
+
+  if (x == 0.0)
+    {
+      return 0.0;
+    }
+
+  /* Guess square root (using bit manipulation) */
+
+  y = lib_sqrtapprox(x);
+
+  /* Perform four iterations of approximation.  This number (4) is
+   * definitely optimal
+   */
+
+  y = 0.5 * (y + x / y);
+  y = 0.5 * (y + x / y);
+  y = 0.5 * (y + x / y);
+  y = 0.5 * (y + x / y);
+
+  /* If guess was terribe (out of range of float).  Repeat approximation
+   * until convergence.
+   */
+
+  if (y * y < x - 1.0 || y * y > x + 1.0)
+    {
+      y1 = -1.0;
+      while (y != y1)
+        {
+          y1 = y;
+          y = 0.5 * (y + x / y);
+        }
+    }
+
+  return y;
+}
+#endif
diff --git a/nuttx/lib/math/lib_sqrtf.c b/nuttx/lib/math/lib_sqrtf.c
new file mode 100644
index 000000000..81817a040
--- /dev/null
+++ b/nuttx/lib/math/lib_sqrtf.c
@@ -0,0 +1,84 @@
+/************************************************************************
+ * lib/math/lib_sqrtf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float sqrtf(float x)
+{
+  float y;
+
+  /* Filter out invalid/trivial inputs */
+
+  if (x < 0.0)
+    {
+      errno = EDOM;
+      return NAN;
+    }
+
+  if (isnan(x))
+    {
+      return NAN;
+    }
+
+  if (isinf(x))
+    {
+      return INFINITY;
+    }
+
+  if (x == 0.0)
+    {
+      return 0.0;
+    }
+
+  /* Guess square root (using bit manipulation) */
+
+  y = lib_sqrtapprox(x);
+
+  /* Perform three iterations of approximation. This number (3) is
+   * definitely optimal
+   */
+
+  y = 0.5 * (y + x / y);
+  y = 0.5 * (y + x / y);
+  y = 0.5 * (y + x / y);
+
+  return y;
+}
diff --git a/nuttx/lib/math/lib_sqrtl.c b/nuttx/lib/math/lib_sqrtl.c
new file mode 100644
index 000000000..6674fe50f
--- /dev/null
+++ b/nuttx/lib/math/lib_sqrtl.c
@@ -0,0 +1,101 @@
+/************************************************************************
+ * lib/math/lib_sqrtl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double sqrtl(long double x)
+{
+  long double y, y1;
+
+  /* Filter out invalid/trivial inputs */
+
+  if (x < 0.0)
+    {
+      errno = EDOM;
+      return NAN;
+    }
+
+  if (isnan(x))
+    {
+    return NAN;
+    }
+
+  if (isinf(x))
+    {
+    return INFINITY;
+    }
+
+  if (x == 0.0)
+    {
+    return 0.0;
+    }
+
+  /* Guess square root (using bit manipulation) */
+
+  y = lib_sqrtapprox(x);
+
+  /* Perform four iterations of approximation.  This number (4) is
+   * definitely optimal
+   */
+
+  y = 0.5 * (y + x / y);
+  y = 0.5 * (y + x / y);
+  y = 0.5 * (y + x / y);
+  y = 0.5 * (y + x / y);
+
+  /* If guess was terribe (out of range of float).  Repeat approximation
+   * until convergence
+   */
+
+  if (y * y < x - 1.0 || y * y > x + 1.0)
+    {
+      y1 = -1.0;
+      while (y != y1)
+        {
+          y1 = y;
+          y = 0.5 * (y + x / y);
+        }
+    }
+
+  return y;
+}
+#endif
diff --git a/nuttx/lib/math/lib_tan.c b/nuttx/lib/math/lib_tan.c
new file mode 100644
index 000000000..bce14b327
--- /dev/null
+++ b/nuttx/lib/math/lib_tan.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_tan.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double tan(double x)
+{
+  return (sin(x) / cos(x));
+}
+#endif
diff --git a/nuttx/lib/math/lib_tanf.c b/nuttx/lib/math/lib_tanf.c
new file mode 100644
index 000000000..3db3bda26
--- /dev/null
+++ b/nuttx/lib/math/lib_tanf.c
@@ -0,0 +1,41 @@
+/************************************************************************
+ * lib/math/lib_tanf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float tanf(float x)
+{
+  return (sinf(x) / cosf(x));
+}
diff --git a/nuttx/lib/math/lib_tanh.c b/nuttx/lib/math/lib_tanh.c
new file mode 100644
index 000000000..46fddd06d
--- /dev/null
+++ b/nuttx/lib/math/lib_tanh.c
@@ -0,0 +1,49 @@
+/************************************************************************
+ * lib/math/lib_tanh.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double tanh(double x)
+{
+  double x0 = exp(x);
+  double x1 = 1.0 / x0;
+
+  return ((x0 + x1) / (x0 - x1));
+}
+#endif
diff --git a/nuttx/lib/math/lib_tanhf.c b/nuttx/lib/math/lib_tanhf.c
new file mode 100644
index 000000000..94d15cc60
--- /dev/null
+++ b/nuttx/lib/math/lib_tanhf.c
@@ -0,0 +1,44 @@
+/************************************************************************
+ * lib/math/lib_tanhf.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+float tanhf(float x)
+{
+  float x0 = expf(x);
+  float x1 = 1.0 / x0;
+
+  return ((x0 + x1) / (x0 - x1));
+}
diff --git a/nuttx/lib/math/lib_tanhl.c b/nuttx/lib/math/lib_tanhl.c
new file mode 100644
index 000000000..23c11d667
--- /dev/null
+++ b/nuttx/lib/math/lib_tanhl.c
@@ -0,0 +1,49 @@
+/************************************************************************
+ * lib/math/lib_tanhl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double tanhl(long double x)
+{
+  long double x0 = exp(x);
+  long double x1 = 1.0 / x0;
+
+  return ((x0 + x1) / (x0 - x1));
+}
+#endif
diff --git a/nuttx/lib/math/lib_tanl.c b/nuttx/lib/math/lib_tanl.c
new file mode 100644
index 000000000..4973aa073
--- /dev/null
+++ b/nuttx/lib/math/lib_tanl.c
@@ -0,0 +1,46 @@
+/************************************************************************
+ * lib/math/lib_tanl.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
+ * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_DOUBLE
+long double tanl(long double x)
+{
+  return (sinl(x) / cosl(x));
+}
+#endif
diff --git a/nuttx/lib/misc/Make.defs b/nuttx/lib/misc/Make.defs
new file mode 100644
index 000000000..c12533f75
--- /dev/null
+++ b/nuttx/lib/misc/Make.defs
@@ -0,0 +1,69 @@
+############################################################################
+# lib/misc/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the internal C files to the build
+
+CSRCS += lib_init.c lib_filesem.c
+
+# Add C files that depend on file OR socket descriptors
+
+ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
+
+CSRCS += lib_sendfile.c
+ifneq ($(CONFIG_NFILE_STREAMS),0)
+CSRCS += lib_streamsem.c
+endif
+
+else
+ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0)
+
+CSRCS += lib_sendfile.c
+ifneq ($(CONFIG_NFILE_STREAMS),0)
+CSRCS += lib_streamsem.c
+endif
+
+endif
+endif
+
+# Add the miscellaneous C files to the build
+
+CSRCS += lib_match.c
+CSRCS += lib_crc32.c
+CSRCS += lib_dbg.c lib_dumpbuffer.c
+
+# Add the misc directory to the build
+
+DEPPATH += --dep-path misc
+VPATH += :misc
diff --git a/nuttx/lib/misc/lib_crc32.c b/nuttx/lib/misc/lib_crc32.c
new file mode 100644
index 000000000..f851598e0
--- /dev/null
+++ b/nuttx/lib/misc/lib_crc32.c
@@ -0,0 +1,123 @@
+/************************************************************************************************
+ * lib/misc/lib_crc32.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
+ *
+ * The logic in this file was developed by Gary S. Brown:
+ *
+ *   COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or code or tables
+ *   extracted from it, as desired without restriction.
+ *
+ * First, the polynomial itself and its table of feedback terms.  The polynomial is:
+ *
+ *    X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
+ *
+ * Note that we take it "backwards" and put the highest-order term in the lowest-order bit.
+ * The X^32 term is "implied"; the LSB is the X^31 term, etc.  The X^0 term (usually shown
+ * as "+1") results in the MSB being 1
+ *
+ * Note that the usual hardware shift register implementation, which is what we're using
+ * (we're merely optimizing it by doing eight-bit chunks at a time) shifts bits into the
+ * lowest-order term.  In our implementation, that means shifting towards the right.  Why
+ * do we do it this way?  Because the calculated CRC must be transmitted in order from
+ * highest-order term to lowest-order term.  UARTs transmit characters in order from LSB
+ * to MSB.  By storing the CRC this way we hand it to the UART in the order low-byte to
+ * high-byte; the UART sends each low-bit to hight-bit; and the result is transmission bit
+ * by bit from highest- to lowest-order term without requiring any bit shuffling on our
+ * part.  Reception works similarly
+ *
+ * The feedback terms table consists of 256, 32-bit entries.  Notes
+ *
+ * - The table can be generated at runtime if desired; code to do so is shown later.  It
+ *   might not be obvious, but the feedback terms simply represent the results of eight
+ *   shift/xor operations for all combinations of data and CRC register values
+ *
+ * - The values must be right-shifted by eight bits by the updcrc logic; the shift must
+ *   be u_(bring in zeroes).  On some hardware you could probably optimize the shift in
+ *   assembler by using byte-swap instructions polynomial $edb88320
+  ************************************************************************************************/
+
+/************************************************************************************************
+ * Included Files
+ ************************************************************************************************/
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <crc32.h>
+
+/************************************************************************************************
+ * Private Data
+ ************************************************************************************************/
+ 
+static const uint32_t crc32_tab[] =
+{
+  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+  0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+  0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+  0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+  0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+  0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+  0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+  0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+  0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+  0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+  0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+  0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+  0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+  0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+  0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+  0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+  0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+  0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
+  0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+  0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+  0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+  0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+/************************************************************************************************
+ * Public Functions
+ ************************************************************************************************/
+/************************************************************************************************
+ * Name: crc32part
+ *
+ * Description:
+ *   Continue CRC calculation on a part of the buffer.
+ *
+ ************************************************************************************************/
+
+uint32_t crc32part(FAR const uint8_t *src, size_t len, uint32_t crc32val)
+{
+  size_t i;
+
+  for (i = 0;  i < len;  i++)
+    {
+      crc32val = crc32_tab[(crc32val ^ src[i]) & 0xff] ^ (crc32val >> 8);
+    }
+  return crc32val;
+}
+
+/************************************************************************************************
+ * Name: crc32
+ *
+ * Description:
+ *   Return a 32-bit CRC of the contents of the 'src' buffer, length 'len'
+ *
+ ************************************************************************************************/
+
+uint32_t crc32(FAR const uint8_t *src, size_t len)
+{
+  return crc32part(src, len, 0);
+}
diff --git a/nuttx/lib/misc/lib_dbg.c b/nuttx/lib/misc/lib_dbg.c
new file mode 100644
index 000000000..aacdaa30a
--- /dev/null
+++ b/nuttx/lib/misc/lib_dbg.c
@@ -0,0 +1,165 @@
+/****************************************************************************
+ * lib/misc/lib_dbg.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdarg.h>
+#include <debug.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/* Debug output is initially disabled */
+
+#ifdef CONFIG_DEBUG_ENABLE
+bool g_dbgenable;
+#endif
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dbg_enable
+ *
+ * Description:
+ *  Enable or disable debug output.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_DEBUG_ENABLE
+void dbg_enable(bool enable)
+{
+  g_dbgenable = enable;
+}
+#endif
+
+/****************************************************************************
+ * Name: dbg, lldbg, vdbg
+ *
+ * Description:
+ *  If the cross-compiler's pre-processor does not support variable
+ * length arguments, then these additional APIs will be built.
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_CPP_HAVE_VARARGS
+#ifdef CONFIG_DEBUG
+int dbg(const char *format, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, format);
+      ret = lib_rawvprintf(format, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+
+#ifdef CONFIG_ARCH_LOWPUTC
+int lldbg(const char *format, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, format);
+      ret = lib_lowvprintf(format, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+#endif
+
+#ifdef CONFIG_DEBUG_VERBOSE
+int vdbg(const char *format, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, format);
+      ret = lib_rawvprintf(format, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+
+#ifdef CONFIG_ARCH_LOWPUTC
+int llvdbg(const char *format, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, format);
+      ret = lib_lowvprintf(format, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+#endif /* CONFIG_ARCH_LOWPUTC */
+#endif /* CONFIG_DEBUG_VERBOSE */
+#endif /* CONFIG_DEBUG */
+#endif /* CONFIG_CPP_HAVE_VARARGS */
diff --git a/nuttx/lib/misc/lib_dumpbuffer.c b/nuttx/lib/misc/lib_dumpbuffer.c
new file mode 100644
index 000000000..155468ca1
--- /dev/null
+++ b/nuttx/lib/misc/lib_dumpbuffer.c
@@ -0,0 +1,129 @@
+/****************************************************************************
+ * lib/misc/lib_dumpbuffer.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <stdint.h>
+#include <debug.h>
+
+/****************************************************************************
+ * Pre-processor definitions
+ ****************************************************************************/
+
+/* Select the lowest level debug interface available */
+
+#ifdef CONFIG_CPP_HAVE_VARARGS
+#  ifdef CONFIG_ARCH_LOWPUTC
+#    define message(format, arg...) lib_lowprintf(format, ##arg)
+#  else
+#    define message(format, arg...) lib_rawprintf(format, ##arg)
+#  endif
+#else
+#  ifdef CONFIG_ARCH_LOWPUTC
+#    define message lib_lowprintf
+#  else
+#    define message lib_rawprintf
+#  endif
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_dumpbuffer
+ *
+ * Description:
+ *  Do a pretty buffer dump
+ *
+ ****************************************************************************/
+
+void lib_dumpbuffer(FAR const char *msg, FAR const uint8_t *buffer, unsigned int buflen)
+{
+  int i, j, k;
+
+  message("%s (%p):\n", msg, buffer);
+  for (i = 0; i < buflen; i += 32)
+    {
+      message("%04x: ", i);
+      for (j = 0; j < 32; j++)
+        {
+          k = i + j;
+
+          if (j == 16)
+            {
+              message(" ");
+            }
+
+          if (k < buflen)
+            {
+              message("%02x", buffer[k]);
+            }
+          else
+            {
+              message("  ");
+            }
+        }
+
+      message(" ");
+      for (j = 0; j < 32; j++)
+        {
+         k = i + j;
+
+          if (j == 16)
+            {
+              message(" ");
+            }
+
+          if (k < buflen)
+            {
+              if (buffer[k] >= 0x20 && buffer[k] < 0x7f)
+                {
+                  message("%c", buffer[k]);
+                }
+              else
+                {
+                  message(".");
+                }
+            }
+        }
+      message("\n");
+   }
+}
diff --git a/nuttx/lib/misc/lib_filesem.c b/nuttx/lib/misc/lib_filesem.c
new file mode 100644
index 000000000..1d1f25c2f
--- /dev/null
+++ b/nuttx/lib/misc/lib_filesem.c
@@ -0,0 +1,145 @@
+/************************************************************************
+ * lib/misc/lib_filesem.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "lib_internal.h"
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+
+/************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+/************************************************************************
+ * lib_sem_initialize
+ ************************************************************************/
+
+void lib_sem_initialize(FAR struct file_struct *stream)
+{
+  /* Initialize the LIB semaphore to one (to support one-at-
+   * a-time access to private data sets.
+   */
+
+  (void)sem_init(&stream->fs_sem, 0, 1);
+
+  stream->fs_holder = -1;
+  stream->fs_counts = 0;
+}
+
+/************************************************************************
+ * lib_take_semaphore
+ ************************************************************************/
+
+void lib_take_semaphore(FAR struct file_struct *stream)
+{
+  pid_t my_pid = getpid();
+
+  /* Do I already have the semaphore? */
+
+  if (stream->fs_holder == my_pid)
+    {
+      /* Yes, just increment the number of references that I have */
+
+      stream->fs_counts++;
+    }
+  else
+    {
+      /* Take the semaphore (perhaps waiting) */
+
+      while (sem_wait(&stream->fs_sem) != 0)
+	{
+	  /* The only case that an error should occr here is if
+	   * the wait was awakened by a signal.
+	   */
+
+	  ASSERT(get_errno() == EINTR);
+	}
+
+      /* We have it.  Claim the stak and return */
+
+      stream->fs_holder = my_pid;
+      stream->fs_counts = 1;
+    }
+}
+
+/************************************************************************
+ * lib_give_semaphore
+ ************************************************************************/
+
+void lib_give_semaphore(FAR struct file_struct *stream)
+{
+  pid_t my_pid = getpid();
+
+  /* I better be holding at least one reference to the semaphore */
+
+  ASSERT(stream->fs_holder == my_pid);
+
+  /* Do I hold multiple references to the semphore */
+
+  if (stream->fs_counts > 1)
+    {
+      /* Yes, just release one count and return */
+
+      stream->fs_counts--;
+    }
+  else
+    {
+      /* Nope, this is the last reference I have */
+
+      stream->fs_holder = -1;
+      stream->fs_counts = 0;
+      ASSERT(sem_post(&stream->fs_sem) == 0);
+    }
+}
+#endif /* CONFIG_STDIO_BUFFER_SIZE */
diff --git a/nuttx/lib/misc/lib_init.c b/nuttx/lib/misc/lib_init.c
new file mode 100644
index 000000000..3403a837b
--- /dev/null
+++ b/nuttx/lib/misc/lib_init.c
@@ -0,0 +1,207 @@
+/************************************************************
+ * lib/misc/lib_init.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <nuttx/kmalloc.h>
+#include <nuttx/fs/fs.h>
+#include <nuttx/lib.h>
+
+#include "lib_internal.h"
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/************************************************************
+ * Private Variables
+ ************************************************************/
+
+/************************************************************
+ * Private Functions
+ ************************************************************/
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * lib_initialize
+ ************************************************************/
+
+/* General library initialization hook */
+
+void weak_const_function lib_initialize(void)
+{
+}
+
+#if CONFIG_NFILE_STREAMS > 0
+/* The following function is called when a new TCB is allocated.  It
+ * creates the streamlist instance that is stored in the TCB.
+ */
+
+FAR struct streamlist *lib_alloclist(void)
+{
+  FAR struct streamlist *list;
+  list = (FAR struct streamlist*)lib_zalloc(sizeof(struct streamlist));
+  if (list)
+    {
+      int i;
+
+      /* Start with a reference count of one */
+
+      list->sl_crefs = 1;
+
+      /* Initialize the list access mutex */
+
+      (void)sem_init(&list->sl_sem, 0, 1);
+
+      /* Initialize each FILE structure */
+
+      for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
+       {
+         /* Clear the IOB */
+
+          memset(&list->sl_streams[i], 0, sizeof(FILE));
+
+          /* Indicate not opened */
+
+          list->sl_streams[i].fs_filedes = -1;
+
+          /* Initialize the stream semaphore to one to support one-at-
+           * a-time access to private data sets.
+           */
+
+          lib_sem_initialize(&list->sl_streams[i]);
+        }
+    }
+  return list;
+
+}
+
+/* This function is called when a TCB is closed (such as with
+ * pthread_create().  It increases the reference count on the stream
+ * list.
+ */
+
+void lib_addreflist(FAR struct streamlist *list)
+{
+  if (list)
+    {
+       /* Increment the reference count on the list.
+        * NOTE: that we disable interrupts to do this
+        * (vs. taking the list semaphore).  We do this
+        * because file cleanup operations often must be
+        * done from the IDLE task which cannot wait
+        * on semaphores.
+        */
+
+       register irqstate_t flags = irqsave();
+       list->sl_crefs++;
+       irqrestore(flags);
+    }
+}
+
+/* this function is called when a TCB is destroyed.  Note that is
+ * does not close the file by release this inode.  This happens
+ * separately when the file descriptor list is freed.
+ */
+
+void lib_releaselist(FAR struct streamlist *list)
+{
+  int crefs;
+  if (list)
+    {
+       /* Decrement the reference count on the list.
+        * NOTE: that we disable interrupts to do this
+        * (vs. taking the list semaphore).  We do this
+        * because file cleanup operations often must be
+        * done from the IDLE task which cannot wait
+        * on semaphores.
+        */
+
+       register irqstate_t flags = irqsave();
+       crefs = --(list->sl_crefs);
+       irqrestore(flags);
+
+       /* If the count decrements to zero, then there is no reference
+        * to the structure and it should be deallocated.  Since there
+        * are references, it would be an error if any task still held
+        * a reference to the list's semaphore.
+        */
+
+       if (crefs <= 0)
+          {
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+            int i;
+#endif
+            /* Destroy the semaphore and release the filelist */
+
+            (void)sem_destroy(&list->sl_sem);
+
+            /* Release each stream in the list */
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+            for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
+             {
+               /* Destroy the semaphore that protects the IO buffer */
+
+               (void)sem_destroy(&list->sl_streams[i].fs_sem);
+
+               /* Release the IO buffer */
+               if (list->sl_streams[i].fs_bufstart)
+                 {
+                   sched_free(list->sl_streams[i].fs_bufstart);
+                 }
+             }
+#endif
+           /* Finally, release the list itself */
+
+            sched_free(list);
+         }
+     }
+}
+
+#endif /* CONFIG_NFILE_STREAMS */
+
+
diff --git a/nuttx/lib/misc/lib_match.c b/nuttx/lib/misc/lib_match.c
new file mode 100644
index 000000000..18e0632ec
--- /dev/null
+++ b/nuttx/lib/misc/lib_match.c
@@ -0,0 +1,148 @@
+/****************************************************************************
+ * lib/misc/lib_match.c - simple shell-style filename matcher
+ *
+ * Simple shell-style filename pattern matcher written by Jef Poskanzer
+ * This pattern matcher only handles '?', '*' and '**', and  multiple
+ * patterns separated by '|'.
+ *
+ *   Copyright © 1995,2000 by Jef Poskanzer <jef@mail.acme.com>.
+ *   All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <string.h>
+#include <nuttx/regex.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: match_one
+ *
+ * Description:
+ *   Does all of the work for one '|' delimited pattern
+ *
+ * Returned Value:
+ *   Returns 1 (match) or 0 (no-match).
+ *
+ ****************************************************************************/
+
+static int match_one(const char *pattern, int patlen, const char *string)
+{
+  const char *p;
+  int pl;
+  int i;
+
+  for (p = pattern; p - pattern < patlen; p++, string++)
+    {
+      if (*p == '?' && *string != '\0')
+        {
+          continue;
+        }
+
+      if (*p == '*')
+        {
+          p++;
+          if (*p == '*')
+            {
+              /* Double-wildcard matches anything. */
+
+              p++;
+              i = strlen(string);
+            }
+          else
+            {
+              /* Single-wildcard matches anything but slash. */
+
+              i = strcspn(string, "/");
+            }
+
+          pl = patlen - (p - pattern);
+          for (; i >= 0; i--)
+            {
+              if (match_one(p, pl, &(string[i])))
+                {
+                  return 1;
+                }
+            }
+          return 0;
+        }
+
+      if (*p != *string)
+        {
+          return 0;
+        }
+    }
+
+  if (*string == '\0')
+    {
+      return 1;
+    }
+  return 0;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: match
+ *
+ * Description:
+ *   Simple shell-style filename pattern matcher written by Jef Poskanzer
+ *   This pattern matcher only handles '?', '*' and '**', and  multiple
+ *   patterns separated by '|'.
+ *
+ * Returned Value:
+ *   Returns 1 (match) or 0 (no-match).
+ *
+ ****************************************************************************/
+
+int match(const char *pattern, const char *string)
+{
+  const char *or;
+
+  for (;;)
+    {
+      or = strchr(pattern, '|');
+      if (or == (char *)0)
+        {
+          return match_one(pattern, strlen(pattern), string);
+        }
+
+      if (match_one(pattern, or - pattern, string))
+        {
+          return 1;
+        }
+
+      pattern = or + 1;
+    }
+}
+
diff --git a/nuttx/lib/misc/lib_sendfile.c b/nuttx/lib/misc/lib_sendfile.c
new file mode 100644
index 000000000..a82eb325e
--- /dev/null
+++ b/nuttx/lib/misc/lib_sendfile.c
@@ -0,0 +1,297 @@
+/************************************************************************
+ * lib/misc/lib_streamsem.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/sendfile.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#if CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0
+
+/************************************************************************
+ * Private types
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Public Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: sendfile
+ *
+ * Description:
+ *   sendfile() copies data between one file descriptor and another.
+ *   sendfile() basically just wraps a sequence of reads() and writes()
+ *   to perform a copy.  It serves a purpose in systems where there is
+ *   a penalty for copies to between user and kernal space, but really
+ *   nothing in NuttX but provide some Linux compatible (and adding
+ *   another 'almost standard' interface). 
+ *
+ *   NOTE: This interface is *not* specified in POSIX.1-2001, or other
+ *   standards.  The implementation here is very similar to the Linux
+ *   sendfile interface.  Other UNIX systems implement sendfile() with
+ *   different semantics and prototypes.  sendfile() should not be used
+ *   in portable programs.
+ *
+ * Input Parmeters:
+ *   infd   - A file (or socket) descriptor opened for reading
+ *   outfd  - A descriptor opened for writing.
+ *   offset - If 'offset' is not NULL, then it points to a variable
+ *            holding the file offset from which sendfile() will start
+ *            reading data from 'infd'.  When sendfile() returns, this
+ *            variable will be set to the offset of the byte following
+ *            the last byte that was read.  If 'offset' is not NULL,
+ *            then sendfile() does not modify the current file offset of
+ *            'infd'; otherwise the current file offset is adjusted to
+ *            reflect the number of bytes read from 'infd.'
+ *
+ *            If 'offset' is NULL, then data will be read from 'infd'
+ *            starting at the current file offset, and the file offset
+ *            will be updated by the call.
+ *   count -  The number of bytes to copy between the file descriptors.
+ *
+ * Returned Value:
+ *   If the transfer was successful, the number of bytes written to outfd is
+ *   returned.  On error, -1 is returned, and errno is set appropriately.
+ *   There error values are those returned by read() or write() plus:
+ *
+ *   EINVAL - Bad input parameters.
+ *   ENOMEM - Could not allocated an I/O buffer
+ *
+ ************************************************************************/
+
+ssize_t sendfile(int outfd, int infd, off_t *offset, size_t count)
+{
+  FAR uint8_t *iobuffer;
+  FAR uint8_t *wrbuffer;
+  off_t startpos = 0;
+  ssize_t nbytesread;
+  ssize_t nbyteswritten;
+  size_t  ntransferred;
+  bool endxfr;
+
+  /* Get the current file position. */
+
+  if (offset)
+    {
+      /* Use lseek to get the current file position */
+
+      startpos = lseek(infd, 0, SEEK_CUR);
+      if (startpos == (off_t)-1)
+        {
+          return ERROR;
+        }
+
+      /* Use lseek again to set the new file position */
+
+      if (lseek(infd, *offset, SEEK_SET) == (off_t)-1)
+        {
+          return ERROR;
+        }
+    }
+
+  /* Allocate an I/O buffer */
+
+  iobuffer = (FAR void *)malloc(CONFIG_LIB_SENDFILE_BUFSIZE);
+  if (!iobuffer)
+    {
+      set_errno(ENOMEM);
+      return ERROR;
+    }
+
+  /* Now transfer 'count' bytes from the infd to the outfd */
+
+  for (ntransferred = 0, endxfr = false; ntransferred < count && !endxfr; )
+    {
+      /* Loop until the read side of the transfer comes to some conclusion */
+
+      do
+        {
+          /* Read a buffer of data from the infd */
+
+          nbytesread = read(infd, iobuffer, CONFIG_LIB_SENDFILE_BUFSIZE);
+
+          /* Check for end of file */
+
+          if (nbytesread == 0)
+            {
+              /* End of file.  Break out and return current number of bytes
+               * transferred.
+               */
+
+              endxfr = true;
+              break;
+            }
+
+          /* Check for a read ERROR.  EINTR is a special case.  This function
+           * should break out and return an error if EINTR is returned and
+           * no data has been transferred.  But what should it do if some
+           * data has been transferred?  I suppose just continue?
+           */
+
+          else if (nbytesread < 0)
+            {
+              /* EINTR is not an error (but will still stop the copy) */
+
+#ifndef CONFIG_DISABLE_SIGNALS
+              if (errno != EINTR || ntransferred == 0)
+#endif
+                {
+                  /* Read error.  Break out and return the error condition. */
+
+                  ntransferred = ERROR;
+                  endxfr       = true;
+                  break;
+                }
+            }
+        }
+      while (nbytesread < 0);
+
+      /* Was anything read? */
+
+      if (!endxfr)
+        {
+          /* Yes.. Loop until the read side of the transfer comes to some
+           * conclusion.
+           */
+
+          wrbuffer = iobuffer;
+          do
+            {
+              /* Write the buffer of data to the outfd */
+
+              nbyteswritten = write(outfd, wrbuffer, nbytesread);
+
+              /* Check for a complete (or parial) write.  write() should not
+               * return zero.
+               */
+
+              if (nbyteswritten >= 0)
+                {
+                  /* Advance the buffer pointer and decrement the number of bytes
+                   * remaining in the iobuffer.  Typically, nbytesread will now
+                   * be zero.
+                   */
+
+                  wrbuffer     += nbyteswritten;
+                  nbytesread   -= nbyteswritten;
+
+                  /* Increment the total number of bytes successfully transferred. */
+
+                  ntransferred += nbyteswritten;
+                }
+
+              /* Otherwise an error occurred */
+
+              else
+                {
+                  /* Check for a read ERROR.  EINTR is a special case.  This
+                   * function should break out and return an error if EINTR
+                   * is returned and no data has been transferred.  But what
+                   * should it do if some data has been transferred?  I
+                   * suppose just continue?
+                   */
+
+#ifndef CONFIG_DISABLE_SIGNALS
+                  if (errno != EINTR || ntransferred == 0)
+#endif
+                    {
+                      /* Write error.  Break out and return the error condition */
+
+                      ntransferred = ERROR;
+                      endxfr       = true;
+                      break;
+                    }
+                }
+            }
+          while (nbytesread > 0);
+        }
+    }
+
+  /* Release the I/O buffer */
+
+  free(iobuffer);
+
+  /* Return the current file position */
+
+  if (offset)
+    {
+      /* Use lseek to get the current file position */
+
+      off_t curpos = lseek(infd, 0, SEEK_CUR);
+      if (curpos == (off_t)-1)
+        {
+          return ERROR;
+        }
+
+      /* Return the current file position */
+
+      *offset = curpos;
+
+      /* Use lseek again to restore the original file position */
+
+      if (lseek(infd, startpos, SEEK_SET) == (off_t)-1)
+        {
+          return ERROR;
+        }
+    }
+
+  /* Finally return the number of bytes actually transferred (or ERROR
+   * if any failure occurred).
+   */
+
+  return ntransferred;
+}
+
+#endif /* CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0 */
diff --git a/nuttx/lib/misc/lib_streamsem.c b/nuttx/lib/misc/lib_streamsem.c
new file mode 100644
index 000000000..fdf494e75
--- /dev/null
+++ b/nuttx/lib/misc/lib_streamsem.c
@@ -0,0 +1,90 @@
+/************************************************************************
+ * lib/misc/lib_streamsem.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <nuttx/fs/fs.h>
+
+#include "lib_internal.h"
+
+/************************************************************************
+ * Private types
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Public Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+void stream_semtake(FAR struct streamlist *list)
+{
+  /* Take the semaphore (perhaps waiting) */
+
+  while (sem_wait(&list->sl_sem) != 0)
+    {
+      /* The only case that an error should occr here is if
+       * the wait was awakened by a signal.
+       */
+
+      ASSERT(get_errno() == EINTR);
+    }
+}
+
+void stream_semgive(FAR struct streamlist *list)
+{
+  sem_post(&list->sl_sem);
+}
+
+
diff --git a/nuttx/lib/mqueue/Make.defs b/nuttx/lib/mqueue/Make.defs
new file mode 100644
index 000000000..40dc6c13e
--- /dev/null
+++ b/nuttx/lib/mqueue/Make.defs
@@ -0,0 +1,48 @@
+############################################################################
+# lib/mqueue/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+ifneq ($(CONFIG_DISABLE_MQUEUE),y)
+
+# Add the mqueue C files to the build
+
+CSRCS += mq_setattr.c mq_getattr.c
+
+# Add the mqueue directory to the build
+
+DEPPATH += --dep-path mqueue
+VPATH += :mqueue
+
+endif
+
diff --git a/nuttx/lib/mqueue/mq_getattr.c b/nuttx/lib/mqueue/mq_getattr.c
new file mode 100644
index 000000000..9c9f47fdc
--- /dev/null
+++ b/nuttx/lib/mqueue/mq_getattr.c
@@ -0,0 +1,104 @@
+/************************************************************************
+ * lib/mqueue/mq_getattr.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <mqueue.h>
+#include <nuttx/mqueue.h>
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Function:  mq_getattr
+ *
+ * Description:
+ *   This functions gets status information and attributes
+ *   associated with the specified message queue.
+ *
+ * Parameters:
+ *   mqdes - Message queue descriptor
+ *   mq_stat - Buffer in which to return attributes
+ *
+ * Return Value:
+ *   0 (OK) if attributes provided, -1 (ERROR) otherwise.
+ *
+ * Assumptions:
+ *
+ ************************************************************************/
+
+int mq_getattr(mqd_t mqdes, struct mq_attr *mq_stat)
+{
+  int ret = ERROR;
+
+  if (mqdes && mq_stat)
+    {
+      /* Return the attributes */
+
+      mq_stat->mq_maxmsg  = mqdes->msgq->maxmsgs;
+      mq_stat->mq_msgsize = mqdes->msgq->maxmsgsize;
+      mq_stat->mq_flags   = mqdes->oflags;
+      mq_stat->mq_curmsgs = mqdes->msgq->nmsgs;
+
+      ret = OK;
+    }
+
+  return ret;
+}
diff --git a/nuttx/lib/mqueue/mq_setattr.c b/nuttx/lib/mqueue/mq_setattr.c
new file mode 100644
index 000000000..1276d64e8
--- /dev/null
+++ b/nuttx/lib/mqueue/mq_setattr.c
@@ -0,0 +1,118 @@
+/************************************************************************
+ * lib/mqueue/mq_setattr.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <fcntl.h>          /* O_NONBLOCK */
+#include <mqueue.h>
+
+#include <nuttx/mqueue.h>
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Function:  mq_setattr
+ *
+ * Description:
+ *   This function sets the attributes associated with the
+ *   specified message queue "mqdes."  Only the "O_NONBLOCK"
+ *   bit of the "mq_flags" can be changed.
+ *
+ *   If "oldstat" is non-null, mq_setattr() will store the
+ *   previous message queue attributes at that location (just
+ *   as would have been returned by mq_getattr()).
+ *
+ * Parameters:
+ *   mqdes - Message queue descriptor
+ *   mq_stat - New attributes
+ *   oldstate - Old attributes
+ *
+ * Return Value:
+ *   0 (OK) if attributes are set successfully, otherwise
+ *   -1 (ERROR).
+ *
+ * Assumptions:
+ *
+ ************************************************************************/
+
+int mq_setattr(mqd_t mqdes, const struct mq_attr *mq_stat,
+               struct mq_attr *oldstat)
+{
+  int ret = ERROR;
+
+  if (mqdes && mq_stat)
+    {
+      /* Return the attributes if so requested */
+
+      if (oldstat)
+        {
+          (void)mq_getattr(mqdes, oldstat);
+        }
+
+      /* Set the new value of the O_NONBLOCK flag. */
+
+      mqdes->oflags = ((mq_stat->mq_flags & O_NONBLOCK) |
+                       (mqdes->oflags & (~O_NONBLOCK)));
+      ret = OK;
+    }
+
+  return ret;
+}
diff --git a/nuttx/lib/net/Make.defs b/nuttx/lib/net/Make.defs
new file mode 100644
index 000000000..ae041bd2c
--- /dev/null
+++ b/nuttx/lib/net/Make.defs
@@ -0,0 +1,44 @@
+############################################################################
+# lib/net/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the networking C files to the build
+
+CSRCS += lib_etherntoa.c lib_htons.c lib_htonl.c lib_inetaddr.c
+CSRCS += lib_inetntoa.c lib_inetntop.c lib_inetpton.c
+
+# Add the net directory to the build
+
+DEPPATH += --dep-path net
+VPATH += :net
diff --git a/nuttx/lib/net/lib_etherntoa.c b/nuttx/lib/net/lib_etherntoa.c
new file mode 100644
index 000000000..f89f205a2
--- /dev/null
+++ b/nuttx/lib/net/lib_etherntoa.c
@@ -0,0 +1,69 @@
+/****************************************************************************
+ * lib/net/lib_etherntoa.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdio.h>
+
+#include <net/ethernet.h>
+#include <netinet/ether.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ether_ntoa
+ *
+ * Description:
+ *   The ether_ntoa() function converts the Ethernet host address addr given
+ *   in network byte order to a string in standard hex-digits-and-colons
+ *   notation. The string is returned in a statically allocated buffer, which
+ *   subsequent calls will overwrite.
+ *
+ ****************************************************************************/
+
+FAR char *ether_ntoa(FAR const struct ether_addr *addr)
+{
+  static char buffer[20];
+  sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x",
+          addr->ether_addr_octet[0], addr->ether_addr_octet[1],
+          addr->ether_addr_octet[2], addr->ether_addr_octet[3],
+          addr->ether_addr_octet[4], addr->ether_addr_octet[5]);
+  return buffer;
+}
diff --git a/nuttx/lib/net/lib_htonl.c b/nuttx/lib/net/lib_htonl.c
new file mode 100644
index 000000000..e4c3e5383
--- /dev/null
+++ b/nuttx/lib/net/lib_htonl.c
@@ -0,0 +1,68 @@
+/************************************************************
+ * lib/net/lib_ntohl.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <arpa/inet.h>
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+uint32_t htonl(uint32_t hl)
+{
+#ifdef CONFIG_ENDIAN_BIG
+  return hl;
+#else
+  return (( (hl) >> 24) |
+          (((hl) >>  8) & 0x0000ff00) |
+          (((hl) <<  8) & 0x00ff0000) |
+	  ( (hl) << 24));
+#endif
+}
+
+uint32_t ntohl(uint32_t nl)
+{
+#ifdef CONFIG_ENDIAN_BIG
+  return nl;
+#else
+  return htonl(nl);
+#endif
+}
diff --git a/nuttx/lib/net/lib_htons.c b/nuttx/lib/net/lib_htons.c
new file mode 100644
index 000000000..b4117e1dc
--- /dev/null
+++ b/nuttx/lib/net/lib_htons.c
@@ -0,0 +1,65 @@
+/***************************************************************************
+ * lib/net/lib_htons.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ***************************************************************************/
+
+/***************************************************************************
+ * Compilation Switches
+ ***************************************************************************/
+
+/***************************************************************************
+ * Included Files
+ ***************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <arpa/inet.h>
+
+/***************************************************************************
+ * Global Functions
+ ***************************************************************************/
+
+uint16_t htons(uint16_t hs)
+{
+  return HTONS(hs);
+}
+
+uint16_t ntohs(uint16_t ns)
+{
+#ifdef CONFIG_ENDIAN_BIG
+  return ns;
+#else
+  return htons(ns);
+#endif
+}
diff --git a/nuttx/lib/net/lib_inetaddr.c b/nuttx/lib/net/lib_inetaddr.c
new file mode 100644
index 000000000..48b01d682
--- /dev/null
+++ b/nuttx/lib/net/lib_inetaddr.c
@@ -0,0 +1,74 @@
+/****************************************************************************
+ * lib/net/lib_inetaddr.c
+ *
+ *   Copyright (C) 2011 Yu Qiang. All rights reserved.
+ *   Author: Yu Qiang <yuq825@gmail.com>
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <arpa/inet.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * name inet_addr
+ *
+ * Description:
+ *   The inet_addr() function converts the string pointed to by cp, in the
+ *   standard IPv4 dotted decimal notation, to an integer value suitable for
+ *   use as an Internet address.
+ 
+ ****************************************************************************/
+
+in_addr_t inet_addr(FAR const char *cp)
+{
+  unsigned int a, b, c, d;
+  uint32_t result;
+
+  sscanf(cp, "%u.%u.%u.%u", &a, &b, &c, &d);
+  result   = a << 8;
+  result  |= b;
+  result <<= 8;
+  result  |= c;
+  result <<= 8;
+  result  |= d;
+  return HTONL(result);
+}
diff --git a/nuttx/lib/net/lib_inetntoa.c b/nuttx/lib/net/lib_inetntoa.c
new file mode 100644
index 000000000..0f4fb61df
--- /dev/null
+++ b/nuttx/lib/net/lib_inetntoa.c
@@ -0,0 +1,79 @@
+/****************************************************************************
+ * lib/net/lib_inetntoa.c
+ *
+ *   Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdio.h>
+#include <arpa/inet.h>
+
+#ifndef CONFIG_NET_IPv6
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: inet_ntoa
+ *
+ * Description:
+ *   The inet_ntoa() function converts the Internet host address in given in
+ *   network byte order to a string in standard numbers-and-dots notation.
+ *   The string is returned in a statically allocated buffer, which subsequent
+ *   calls will overwrite.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CAN_PASS_STRUCTS
+FAR char *inet_ntoa(struct in_addr in)
+{
+  static char buffer[INET_ADDRSTRLEN+2];
+  FAR char *ptr = (FAR char*)&in.s_addr;
+  sprintf(buffer, "%d.%d.%d.%d", ptr[0], ptr[1], ptr[2], ptr[3]);
+  return buffer;
+}
+#else
+FAR char *_inet_ntoa(in_addr_t in)
+{
+  static char buffer[INET_ADDRSTRLEN+2];
+  FAR char *ptr = (FAR char*)&in;
+  sprintf(buffer, "%d.%d.%d.%d", ptr[0], ptr[1], ptr[2], ptr[3]);
+  return buffer;
+}
+#endif
+#endif /* !CONFIG_NET_IPv6 */
+
diff --git a/nuttx/lib/net/lib_inetntop.c b/nuttx/lib/net/lib_inetntop.c
new file mode 100644
index 000000000..dc6a2d0d7
--- /dev/null
+++ b/nuttx/lib/net/lib_inetntop.c
@@ -0,0 +1,202 @@
+/****************************************************************************
+ * lib/net/lib_inetntop.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Includes some logic extracted from hwport_ftpd, written by Jaehyuk Cho
+ * <minzkn@minzkn.com> which was released under the BSD license.
+ *
+ *   Copyright (C) HWPORT.COM. All rights reserved.
+ *   Author: JAEHYUK CHO <mailto:minzkn@minzkn.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/socket.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <arpa/inet.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: inet_ntop
+ *
+ * Description:
+ *  The inet_ntop() function converts a numeric address into a text string
+ *  suitable for presentation.
+ *
+ * Input Parameters:
+ *   af   - The af argument specifies the family of the address. This can be
+ *          AF_INET or AF_INET6.
+ *   src  - The src argument points to a buffer holding an address of the
+ *          specified type.  The address must be in network byte order.
+ *   dst  - The dst argument points to a buffer where the function stores
+ *          the resulting text string; it shall not be NULL.
+ *   size - The size argument specifies the size of this buffer, which must
+ *          be large enough to hold the text string (INET_ADDRSTRLEN
+ *          characters for IPv4, INET6_ADDRSTRLEN characters for IPv6).
+ *
+ * Returned Value:
+ *   inet_ntop() returns a pointer to the buffer containing the text string
+ *   if the conversion succeeds.  Otherwise, NULL is returned and the errno
+ *   is set to indicate the error.  There follow errno values may be set:
+ *
+ *   EAFNOSUPPORT - The af argument is invalid.
+ *   ENOSPC - The size of the inet_ntop() result buffer is inadequate
+ *
+ ****************************************************************************/
+
+FAR const char *inet_ntop(int af, FAR const void *src, FAR char *dst, socklen_t size)
+{
+  int errval;
+#ifndef CONFIG_NET_IPv6
+  FAR char *ptr;
+
+  DEBUGASSERT(src && dst);
+
+  if (af != AF_INET)
+    {
+      errval = EAFNOSUPPORT;
+      goto errout;
+    }
+
+  if (size < INET_ADDRSTRLEN)
+    {
+      errval = ENOSPC;
+      goto errout;
+    }
+
+  ptr = (FAR char*)src;
+  sprintf(dst, "%d.%d.%d.%d", ptr[0], ptr[1], ptr[2], ptr[3]);
+  return dst;
+#else
+  FAR const struct in6_addr *in6_addr;
+  uint16_t warray[8];
+  int offset;
+  int entry;
+  int count;
+  int maxentry;
+  int maxcount;
+ 
+  DEBUGASSERT(src && dst);
+
+  if (af != AF_INET6)
+    {
+      errval = EAFNOSUPPORT;
+      goto errout;
+    }
+
+  if (size < INET6_ADDRSTRLEN)
+    {
+      errval = ENOSPC;
+      goto errout;
+    }
+
+  in6_addr = (FAR const struct in6_addr *)src;
+  entry    = -1;
+  maxentry = -1;
+  maxcount = 0;
+  offset   = 0;
+
+  while (offset < 8)
+    {
+      warray[offset] = ntohs(in6_addr->s6_addr16[offset]);
+      if (warray[offset] == 0)
+        {
+          entry = offset;
+          count = 1;
+          offset++;
+
+          while (offset < 8)
+            {
+              warray[offset] = ntohs(in6_addr->s6_addr16[offset]);
+              if (warray[offset] != 0)
+                {
+                  break;
+                }
+              offset++;
+              count++;
+            }
+
+          if (count > maxcount)
+            {
+              maxentry = entry;
+              maxcount = count;
+            }
+        }
+      offset++;
+    }
+
+  offset = 0;
+  dst[0] = '\0';
+
+  while (offset < 8)
+    {
+      if (offset == maxentry)
+        {
+          size   -= snprintf(&dst[strlen(dst)], size, ":");
+          offset += maxcount;
+          if (offset >= 8)
+            {
+              size -= snprintf(&dst[strlen(dst)], size, ":");
+            }
+        }
+      else
+        {
+          if (offset > 0)
+            {
+              size -= snprintf(&dst[strlen(dst)], size, ":");
+            }
+
+          size -= snprintf(&dst[strlen(dst)], size, "%x", warray[offset]);
+          offset++;
+        }
+    }
+
+    return dst;
+#endif
+
+errout:
+    set_errno(errval);
+    memset(dst, 0, size);
+    return NULL;
+}
diff --git a/nuttx/lib/net/lib_inetpton.c b/nuttx/lib/net/lib_inetpton.c
new file mode 100644
index 000000000..5371cd3f2
--- /dev/null
+++ b/nuttx/lib/net/lib_inetpton.c
@@ -0,0 +1,338 @@
+/****************************************************************************
+ * lib/net/lib_inetpton.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Includes some logic extracted from hwport_ftpd, written by Jaehyuk Cho
+ * <minzkn@minzkn.com> which was released under the BSD license.
+ *
+ *   Copyright (C) HWPORT.COM. All rights reserved.
+ *   Author: JAEHYUK CHO <mailto:minzkn@minzkn.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/socket.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <arpa/inet.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: inet_pton
+ *
+ * Description:
+ *  The inet_pton() function converts an address in its standard text
+ *  presentation form into its numeric binary form.
+ *
+ *  If the af argument of inet_pton() is AF_INET, the src string will be
+ *  in the standard IPv4 dotted-decimal form:
+ *
+ *    ddd.ddd.ddd.ddd
+ *
+ *  where "ddd" is a one to three digit decimal number between 0 and 255.
+ *
+ *  If the af argument of inet_pton() is AF_INET6, the src string will be in
+ *  one of the following standard IPv6 text forms:
+ *
+ *  1. The preferred form is "x:x:x:x:x:x:x:x", where the 'x' s are the
+ *     hexadecimal values of the eight 16-bit pieces of the address. Leading
+ *     zeros in individual fields can be omitted, but there must be at least
+ *     one numeral in every field.
+ *
+ *  2. A string of contiguous zero fields in the preferred form can be shown
+ *     as "::". The "::" can only appear once in an address. Unspecified
+ *     addresses ( "0:0:0:0:0:0:0:0" ) may be represented simply as "::".
+ *
+ *  3. A third form that is sometimes more convenient when dealing with a
+ *     mixed environment of IPv4 and IPv6 nodes is "x:x:x:x:x:x:d.d.d.d",
+ *     where the 'x' s are the hexadecimal values of the six high-order
+ *     16-bit pieces of the address, and the 'd' s are the decimal values
+ *     of the four low-order 8-bit pieces of the address (standard IPv4
+ *     representation).
+ *
+ * Input Parameters:
+ *   af   - The af argument specifies the family of the address. This can be
+ *          AF_INET or AF_INET6.
+ *   src  - The src argument points to the string being passed in.
+ *   dst  - The dst argument points to a numstr into which the function stores
+ *          the numeric address; this must be large enough to hold the numeric
+ *          address (32 bits for AF_INET, 128 bits for AF_INET6).
+ *
+ * Returned Value:
+ *   The inet_pton() function returns 1 if the conversion succeeds, with the
+ *   address pointed to by dst in network byte order. It will return 0 if the
+ *   input is not a valid IPv4 dotted-decimal string or a valid IPv6 address
+ *   string, or -1 with errno set to EAFNOSUPPOR] if the af argument is unknown.
+ *
+ ****************************************************************************/
+
+int inet_pton(int af, FAR const char *src, FAR void *dst)
+{
+#ifndef CONFIG_NET_IPv6
+  size_t srcoffset;
+  size_t numoffset;
+  int value;
+  int ndots;
+  uint8_t ch;
+  char numstr[4];
+  uint8_t *ip;
+
+  DEBUGASSERT(src && dst);
+
+  if (af != AF_INET)
+    {
+      set_errno(EAFNOSUPPORT);
+      return -1;
+    }
+
+  (void)memset(dst, 0, sizeof(struct in_addr));
+
+  ip        = (uint8_t *)dst;
+  srcoffset = 0;
+  numoffset = 0;
+  ndots     = 0;
+
+  for(;;)
+    {
+      ch = (uint8_t)src[srcoffset++];
+
+      if (ch == '.' || ch == '\0')
+        {
+          if (ch == '.' && ndots >= 4)
+            {
+              /* Too many dots */
+
+              break;
+            }
+
+          if (numoffset <= 0)
+            {
+              /* Empty numeric string */
+
+              break;
+            }
+
+          numstr[numoffset] = '\0';
+          numoffset = 0;
+
+          value = atoi(numstr);
+          if (value < 0 || value > 255)
+            {
+              /* Out of range value */
+
+              break;
+            }
+
+          ip[ndots] = (uint8_t)value;
+
+          if (ch == '\0')
+            {
+              if (ndots != 3)
+                {
+                  /* Not enough dots */
+
+                  break;
+                }
+
+              /* Return 1 if the conversion succeeds */
+
+              return 1;
+            }
+
+          ndots++;
+        }
+      else if (ch >= '0' && ch <= '9')
+        {
+          numstr[numoffset++] = ch;
+          if (numoffset >= 4)
+            {
+              /* Number is too long */
+
+              break;
+            }
+        }
+      else
+        {
+          /* Illegal character */
+
+          break;
+        }
+    }
+
+  /* Return zero if there is any problem parsing the input */
+
+  return 0;
+#else
+  size_t srcoffset;
+  size_t numoffset;
+  long value;
+  int nsep;
+  int nrsep;
+  uint8_t ch;
+  char numstr[5];
+  uint8_t ip[sizeof(struct in6_addr)];
+  uint8_t rip[sizeof(struct in6_addr)];
+  bool rtime;
+
+  DEBUGASSERT(src && dst);
+
+  if (af != AF_INET6)
+    {
+      set_errno(EAFNOSUPPORT);
+      return -1;
+    }
+
+  (void)memset(dst, 0, sizeof(struct in6_addr));
+
+  srcoffset = 0;
+  numoffset = 0;
+  nsep      = 0;
+  nrsep     = 0;
+  rtime     = false;
+
+  for(;;)
+    {
+      ch = (uint8_t)src[srcoffset++];
+
+      if (ch == ':' || ch == '\0')
+        {
+          if (ch == ':' && (nsep + nrsep) >= 8)
+            {
+              /* Too many separators */
+
+              break;
+            }
+
+          if (ch != '\0' && numoffset <= 0)
+            {
+              /* Empty numeric string */
+
+              if (rtime && nrsep > 1)
+                {
+                  /* dup simple */
+
+                  break;
+                }
+
+              numoffset = 0;
+              rtime = true;
+              continue;
+            }
+
+          numstr[numoffset] = '\0';
+          numoffset = 0;
+
+          value = strtol(numstr, NULL, 16);
+          if (value < 0 || value > 0xffff)
+            {
+              /* Out of range value */
+
+              break;
+            }
+
+          if (!rtime)
+            {
+              ip[(nsep << 1) + 0] = (uint8_t)((value >> 8) & 0xff);
+              ip[(nsep << 1) + 1] = (uint8_t)((value >> 0) & 0xff);
+              nsep++;
+            }
+          else
+            {
+              rip[(nrsep << 1) + 0] = (uint8_t)((value >> 8) & 0xff);
+              rip[(nrsep << 1) + 1] = (uint8_t)((value >> 0) & 0xff);
+              nrsep++;
+            }
+
+          if (ch == '\0' /* || ch == '/' */)
+            {
+              if ((nsep <= 1 && nrsep <= 0) ||
+                  (nsep + nrsep) < 1 ||
+                  (nsep + nrsep) > 8)
+                {
+                  /* Separator count problem */
+
+                  break;
+                }
+
+              if (nsep > 0)
+                {
+                  memcpy(dst, &ip[0], nsep << 1);
+                }
+
+              if (nrsep > 0)
+                {
+                  memcpy(dst + (16 - (nrsep << 1)), &rip[0], nrsep << 1);
+                }
+
+              /* Return 1 if the conversion succeeds */
+
+              return 1;
+            }
+        }
+      else if ((ch >= '0' && ch <= '9') ||
+               (ch >= 'a' && ch <= 'f') ||
+               (ch >= 'A' && ch <= 'F'))
+        {
+          numstr[numoffset++] = ch;
+          if (numoffset >= 5)
+            {
+              /* Numeric string is too long */
+
+              break;
+            }
+        }
+      else
+        {
+          /* Illegal character */
+
+          break;
+        }
+    }
+
+
+  /* Return zero if there is any problem parsing the input */
+
+  return 0;
+#endif
+}
diff --git a/nuttx/lib/pthread/Make.defs b/nuttx/lib/pthread/Make.defs
new file mode 100644
index 000000000..a1eba7bb0
--- /dev/null
+++ b/nuttx/lib/pthread/Make.defs
@@ -0,0 +1,56 @@
+############################################################################
+# lib/pthread/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the pthread C files to the build
+
+CSRCS += pthread_attrinit.c pthread_attrdestroy.c \
+		  pthread_attrsetschedpolicy.c pthread_attrgetschedpolicy.c \
+		  pthread_attrsetinheritsched.c pthread_attrgetinheritsched.c \
+		  pthread_attrsetstacksize.c pthread_attrgetstacksize.c \
+		  pthread_attrsetschedparam.c pthread_attrgetschedparam.c \
+		  pthread_barrierattrinit.c pthread_barrierattrdestroy.c \
+		  pthread_barrierattrgetpshared.c pthread_barrierattrsetpshared.c \
+		  pthread_condattrinit.c pthread_condattrdestroy.c \
+		  pthread_mutexattrinit.c pthread_mutexattrdestroy.c \
+		  pthread_mutexattrgetpshared.c pthread_mutexattrsetpshared.c
+
+ifeq ($(CONFIG_MUTEX_TYPES),y)
+CSRCS += pthread_mutexattrsettype.c pthread_mutexattrgettype.c
+endif
+
+# Add the pthread directory to the build
+
+DEPPATH += --dep-path pthread
+VPATH += :pthread
diff --git a/nuttx/lib/pthread/pthread_attrdestroy.c b/nuttx/lib/pthread/pthread_attrdestroy.c
new file mode 100644
index 000000000..103528c7e
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrdestroy.c
@@ -0,0 +1,108 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrdestroy.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <string.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_destroy
+ *
+ * Description:
+ *    An attributes object can be deleted when it is no longer
+ *     needed.
+ *
+ * Parameters:
+ *   attr
+ *
+ * Return Value:
+ *   0 meaning success
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_destroy(FAR pthread_attr_t *attr)
+{
+  int ret;
+
+  sdbg("attr=0x%p\n", attr);
+
+  if (!attr)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      memset(attr, 0, sizeof(pthread_attr_t));
+      ret = OK;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
+
diff --git a/nuttx/lib/pthread/pthread_attrgetinheritsched.c b/nuttx/lib/pthread/pthread_attrgetinheritsched.c
new file mode 100644
index 000000000..02d6e0b7c
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrgetinheritsched.c
@@ -0,0 +1,111 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrgetinheritsched.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <string.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_getinheritsched
+ *
+ * Description:
+ *   Report whether the scheduling info in the pthread
+ *   attributes will be used or if the thread will
+ *   inherit the properties of the parent.
+ *
+ * Parameters:
+ *   attr
+ *   inheritsched
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_getinheritsched(FAR const pthread_attr_t *attr,
+                                 FAR int *inheritsched)
+{
+  int ret;
+
+  sdbg("attr=0x%p inheritsched=0x%p\n", attr, inheritsched);
+
+  if (!attr || !inheritsched)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      *inheritsched = (int)attr->inheritsched;
+      ret = OK;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
+
diff --git a/nuttx/lib/pthread/pthread_attrgetschedparam.c b/nuttx/lib/pthread/pthread_attrgetschedparam.c
new file mode 100644
index 000000000..c6bf55dea
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrgetschedparam.c
@@ -0,0 +1,110 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrgetschedparam.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <string.h>
+#include <sched.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_getschedparam
+ *
+ * Description:
+ *
+ * Parameters:
+ *   attr
+ *   param
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_getschedparam(FAR pthread_attr_t *attr,
+                               FAR struct sched_param *param)
+{
+  int ret;
+
+  sdbg("attr=0x%p param=0x%p\n", attr, param);
+
+  if (!attr || !param)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      param->sched_priority = attr->priority;
+      ret = OK;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
+
+
diff --git a/nuttx/lib/pthread/pthread_attrgetschedpolicy.c b/nuttx/lib/pthread/pthread_attrgetschedpolicy.c
new file mode 100644
index 000000000..c42b828c9
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrgetschedpolicy.c
@@ -0,0 +1,105 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrgetschedpolicy.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <pthread.h>
+#include <string.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_getschedpolicy
+ *
+ * Description:
+ *   Obtain the scheduling algorithm attribute.
+ *
+ * Parameters:
+ *   attr
+ *   policy
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_getschedpolicy(FAR pthread_attr_t *attr, int *policy)
+{
+  int ret;
+
+  sdbg("attr=0x%p policy=0x%p\n", attr, policy);
+
+  if (!attr || !policy)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      *policy = attr->policy;
+      ret = OK;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_attrgetstacksize.c b/nuttx/lib/pthread/pthread_attrgetstacksize.c
new file mode 100644
index 000000000..2faa586ba
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrgetstacksize.c
@@ -0,0 +1,106 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrgetstacksize.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <pthread.h>
+#include <string.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_getstacksize
+ *
+ * Description:
+ *
+ * Parameters:
+ *   attr
+ *   stacksize
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_getstacksize(FAR pthread_attr_t *attr, FAR long *stacksize)
+{
+  int ret;
+
+  sdbg("attr=0x%p stacksize=0x%p\n", attr, stacksize);
+
+  if (!stacksize)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      *stacksize = attr->stacksize;
+      ret = OK;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
+
diff --git a/nuttx/lib/pthread/pthread_attrinit.c b/nuttx/lib/pthread/pthread_attrinit.c
new file mode 100644
index 000000000..d06a535d7
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrinit.c
@@ -0,0 +1,123 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrinit.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <string.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/pthread.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/* Default pthread attributes (see included/nuttx/pthread.h).  When configured
+ * to build separate kernel- and user-address spaces, this global is
+ * duplicated in each address spaced.  This copy can only be shared within
+ * the user address space. 
+ */
+
+#if defined(CONFIG_NUTTX_KERNEL) && !defined(__KERNEL__)
+pthread_attr_t g_default_pthread_attr = PTHREAD_ATTR_INITIALIZER;
+#endif
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_init
+ *
+ * Description:
+ *   Initializes a thread attributes object (attr) with
+ *   default values for all of the individual attributes
+ *   used by a given implementation.
+ *
+ * Parameters:
+ *   attr
+ *
+ * Return Value:
+ *   0 on success, otherwise an error number
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_init(FAR pthread_attr_t *attr)
+{
+  int ret = OK;
+
+  sdbg("attr=0x%p\n", attr);
+  if (!attr)
+    {
+      ret = ENOMEM;
+    }
+  else
+    {
+      /* Set the child thread priority to be the default
+       * priority. Set the child stack size to some arbitrary
+       * default value.
+       */
+
+      memcpy(attr, &g_default_pthread_attr, sizeof(pthread_attr_t));
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
diff --git a/nuttx/lib/pthread/pthread_attrsetinheritsched.c b/nuttx/lib/pthread/pthread_attrsetinheritsched.c
new file mode 100644
index 000000000..df2c2fba3
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrsetinheritsched.c
@@ -0,0 +1,113 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrsetinheritsched.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <pthread.h>
+#include <string.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_setinheritsched
+ *
+ * Description:
+ *   Indicate whether the scheduling info in the pthread
+ *   attributes will be used or if the thread will
+ *   inherit the properties of the parent.
+ *
+ * Parameters:
+ *   attr
+ *   policy
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_setinheritsched(FAR pthread_attr_t *attr,
+                                 int inheritsched)
+{
+  int ret;
+
+  sdbg("inheritsched=%d\n", inheritsched);
+
+  if (!attr ||
+      (inheritsched != PTHREAD_INHERIT_SCHED &&
+       inheritsched != PTHREAD_EXPLICIT_SCHED))
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->inheritsched = (uint8_t)inheritsched;
+      ret = OK;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
diff --git a/nuttx/lib/pthread/pthread_attrsetschedparam.c b/nuttx/lib/pthread/pthread_attrsetschedparam.c
new file mode 100644
index 000000000..c2ab4d1c4
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrsetschedparam.c
@@ -0,0 +1,108 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrsetschedparam.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <string.h>
+#include <sched.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_setschedparam
+ *
+ * Description:
+ *
+ * Parameters:
+ *   attr
+ *   param
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_setschedparam(FAR pthread_attr_t *attr,
+			       FAR const struct sched_param *param)
+{
+  int ret;
+
+  sdbg("attr=0x%p param=0x%p\n", attr, param);
+
+  if (!attr || !param)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->priority = (short)param->sched_priority;
+      ret = OK;
+    }
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
+
diff --git a/nuttx/lib/pthread/pthread_attrsetschedpolicy.c b/nuttx/lib/pthread/pthread_attrsetschedpolicy.c
new file mode 100644
index 000000000..4e43e635d
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrsetschedpolicy.c
@@ -0,0 +1,111 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrsetschedpolicy.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <string.h>
+#include <sched.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_setschedpolicy
+ *
+ * Description:
+ *   Set the scheduling algorithm attribute.
+ *
+ * Parameters:
+ *   attr
+ *   policy
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_setschedpolicy(FAR pthread_attr_t *attr, int policy)
+{
+  int ret;
+
+  sdbg("attr=0x%p policy=%d\n", attr, policy);
+
+#if CONFIG_RR_INTERVAL > 0
+  if (!attr || (policy != SCHED_FIFO && policy != SCHED_RR))
+#else
+  if (!attr || policy != SCHED_FIFO )
+#endif
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->policy = policy;
+      ret = OK;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_attrsetstacksize.c b/nuttx/lib/pthread/pthread_attrsetstacksize.c
new file mode 100644
index 000000000..8a826dd3a
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_attrsetstacksize.c
@@ -0,0 +1,106 @@
+/****************************************************************************
+ * lib/pthread/pthread_attrsetstacksize.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <string.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_attr_setstacksize
+ *
+ * Description:
+ *
+ * Parameters:
+ *   attr
+ *   stacksize
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_attr_setstacksize(FAR pthread_attr_t *attr, long stacksize)
+{
+  int ret;
+
+  sdbg("attr=0x%p stacksize=%ld\n", attr, stacksize);
+
+  if (!attr || stacksize < PTHREAD_STACK_MIN)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->stacksize = stacksize;
+      ret = OK;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
diff --git a/nuttx/lib/pthread/pthread_barrierattrdestroy.c b/nuttx/lib/pthread/pthread_barrierattrdestroy.c
new file mode 100644
index 000000000..6d16b9cff
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_barrierattrdestroy.c
@@ -0,0 +1,102 @@
+/********************************************************************************
+ * lib/pthread/pthread_barrierattrdestroy.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ********************************************************************************/
+
+/********************************************************************************
+ * Included Files
+ ********************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <errno.h>
+#include <debug.h>
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Type Declarations
+ ********************************************************************************/
+
+/********************************************************************************
+ * Global Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Function Prototypes
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function: pthread_barrierattr_destroy
+ *
+ * Description:
+ *   The pthread_barrierattr_destroy() function will destroy a barrier attributes
+ *   object.  A destroyed attr attributes object can be reinitialized using
+ *   pthread_barrierattr_init(); the results of otherwise referencing the object
+ *   after it has been destroyed are undefined.
+ *
+ * Parameters:
+ *   attr - barrier attributes to be destroyed.
+ *
+ * Return Value:
+ *   0 (OK) on success or EINVAL if attr is invalid.
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+int pthread_barrierattr_destroy(FAR pthread_barrierattr_t *attr)
+{
+  int ret = OK;
+
+  if (!attr)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->pshared = PTHREAD_PROCESS_PRIVATE;
+    }
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_barrierattrgetpshared.c b/nuttx/lib/pthread/pthread_barrierattrgetpshared.c
new file mode 100644
index 000000000..d29bc6dfc
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_barrierattrgetpshared.c
@@ -0,0 +1,101 @@
+/********************************************************************************
+ * lib/pthread/pthread_barrierattrgetpshared.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ********************************************************************************/
+
+/********************************************************************************
+ * Included Files
+ ********************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <errno.h>
+#include <debug.h>
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Type Declarations
+ ********************************************************************************/
+
+/********************************************************************************
+ * Global Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Function Prototypes
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function: pthread_barrierattr_getpshared
+ *
+ * Description:
+ *   The pthread_barrierattr_getpshared() function will obtain the value of the
+ *   process-shared attribute from the attributes object referenced by attr.
+ *
+ * Parameters:
+ *   attr - barrier attributes to be queried.
+ *   pshared - the location to stored the current value of the pshared attribute.
+ *
+ * Return Value:
+ *   0 (OK) on success or EINVAL if either attr or pshared is invalid.
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+int pthread_barrierattr_getpshared(FAR const pthread_barrierattr_t *attr, FAR int *pshared)
+{
+  int ret = OK;
+
+  if (!attr || !pshared)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      *pshared = attr->pshared;
+    }
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_barrierattrinit.c b/nuttx/lib/pthread/pthread_barrierattrinit.c
new file mode 100644
index 000000000..b5f35ca91
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_barrierattrinit.c
@@ -0,0 +1,101 @@
+/********************************************************************************
+ * lib/pthread/pthread_barrierattrinit.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ********************************************************************************/
+
+/********************************************************************************
+ * Included Files
+ ********************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <errno.h>
+#include <debug.h>
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Type Declarations
+ ********************************************************************************/
+
+/********************************************************************************
+ * Global Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Function Prototypes
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function: pthread_barrierattr_init
+ *
+ * Description:
+ *   The pthread_barrierattr_init() function will initialize a barrier attribute
+ *   object attr with the default value for all of the attributes defined by the
+ *   implementation.
+ *
+ * Parameters:
+ *   attr - barrier attributes to be initialized.
+ *
+ * Return Value:
+ *   0 (OK) on success or EINVAL if attr is invalid.
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+int pthread_barrierattr_init(FAR pthread_barrierattr_t *attr)
+{
+  int ret = OK;
+
+  if (!attr)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->pshared = PTHREAD_PROCESS_PRIVATE;
+    }
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_barrierattrsetpshared.c b/nuttx/lib/pthread/pthread_barrierattrsetpshared.c
new file mode 100644
index 000000000..d0eecbf5a
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_barrierattrsetpshared.c
@@ -0,0 +1,111 @@
+/********************************************************************************
+ * lib/pthread/pthread_barrierattrsetpshared.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ********************************************************************************/
+
+/********************************************************************************
+ * Included Files
+ ********************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <errno.h>
+#include <debug.h>
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Type Declarations
+ ********************************************************************************/
+
+/********************************************************************************
+ * Global Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Function Prototypes
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function: pthread_barrierattr_setpshared
+ *
+ * Description:
+ *   The process-shared attribute is set to PTHREAD_PROCESS_SHARED to permit a
+ *   barrier to be operated upon by any thread that has access to the memory where
+ *   the barrier is allocated. If the process-shared attribute is
+ *   PTHREAD_PROCESS_PRIVATE, the barrier can only be operated upon by threads
+ *   created within the same process as the thread that initialized the barrier.
+ *   If threads of different processes attempt to operate on such a barrier, the
+ *   behavior is undefined. The default value of the attribute is
+ *   PTHREAD_PROCESS_PRIVATE.
+ *
+ *   Both constants PTHREAD_PROCESS_SHARED and PTHREAD_PROCESS_PRIVATE are defined
+ *   in pthread.h.
+ *
+ * Parameters:
+ *   attr - barrier attributes to be modified.
+ *   pshared - the new value of the pshared attribute.
+ *
+ * Return Value:
+ *   0 (OK) on success or EINVAL if either attr is invalid or pshared is not one
+ *   of PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE.
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+int pthread_barrierattr_setpshared(FAR pthread_barrierattr_t *attr, int pshared)
+{
+  int ret = OK;
+
+  if (!attr || (pshared != PTHREAD_PROCESS_SHARED && pshared != PTHREAD_PROCESS_PRIVATE))
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->pshared = pshared;
+    }
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_condattrdestroy.c b/nuttx/lib/pthread/pthread_condattrdestroy.c
new file mode 100644
index 000000000..d6c3df5d1
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_condattrdestroy.c
@@ -0,0 +1,82 @@
+/****************************************************************************
+ * lib/pthread/pthread_condattrdestroy.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_condattr_destroy
+ *
+ * Description:
+ *   Operations on condition variable attributes
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_condattr_destroy(FAR pthread_condattr_t *attr)
+{
+  int ret = OK;
+
+  sdbg("attr=0x%p\n", attr);
+
+  if (!attr)
+    {
+      ret = EINVAL;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
+
+
diff --git a/nuttx/lib/pthread/pthread_condattrinit.c b/nuttx/lib/pthread/pthread_condattrinit.c
new file mode 100644
index 000000000..5721c6159
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_condattrinit.c
@@ -0,0 +1,85 @@
+/****************************************************************************
+ * lib/pthread/pthread_condattrinit.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_condattr_init
+ *
+ * Description:
+ *   Operations on condition variable attributes
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_condattr_init(FAR pthread_condattr_t *attr)
+{
+  int ret = OK;
+
+  sdbg("attr=0x%p\n", attr);
+
+  if (!attr)
+    {
+      ret = EINVAL;
+    }
+  else 
+    {
+      *attr = 0;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
+
+
diff --git a/nuttx/lib/pthread/pthread_mutexattrdestroy.c b/nuttx/lib/pthread/pthread_mutexattrdestroy.c
new file mode 100644
index 000000000..e9868df68
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_mutexattrdestroy.c
@@ -0,0 +1,104 @@
+/****************************************************************************
+ * lib/pthread/pthread_mutexattrdestroy.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <errno.h>
+#include <debug.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_mutexattr_destroy
+ *
+ * Description:
+ *    Destroy mutex attributes.
+ *
+ * Parameters:
+ *    attr
+ *    pshared
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_mutexattr_destroy(FAR pthread_mutexattr_t *attr)
+{
+  int ret = OK;
+
+  sdbg("attr=0x%p\n", attr);
+
+  if (!attr)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->pshared = 0;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_mutexattrgetpshared.c b/nuttx/lib/pthread/pthread_mutexattrgetpshared.c
new file mode 100644
index 000000000..bc6379db5
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_mutexattrgetpshared.c
@@ -0,0 +1,104 @@
+/****************************************************************************
+ * lib/pthread/pthread_mutexattrgetpshared.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <errno.h>
+#include <debug.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_mutexattr_getpshared
+ *
+ * Description:
+ *    Get pshared mutex attribute.
+ *
+ * Parameters:
+ *    attr
+ *    pshared
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_mutexattr_getpshared(FAR pthread_mutexattr_t *attr, FAR int *pshared)
+{
+  int ret = OK;
+
+  sdbg("attr=0x%p pshared=0x%p\n", attr, pshared);
+
+  if (!attr || !pshared)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      *pshared = attr->pshared;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_mutexattrgettype.c b/nuttx/lib/pthread/pthread_mutexattrgettype.c
new file mode 100644
index 000000000..5fb10f301
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_mutexattrgettype.c
@@ -0,0 +1,98 @@
+/****************************************************************************
+ * lib/pthread/pthread_mutexattrgettype.c
+ *
+ *   Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <pthread.h>
+#include <errno.h>
+
+#ifdef CONFIG_MUTEX_TYPES
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: pthread_mutexattr_gettype
+ *
+ * Description:
+ *   Return the mutex type from the mutex attributes.
+ *
+ * Parameters:
+ *   attr - The mutex attributes to query
+ *   type - Location to return the mutex type
+ *
+ * Return Value:
+ *   0, if the mutex type was successfully return in 'type', or
+ *   EINVAL, if any NULL pointers provided.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_mutexattr_gettype(const pthread_mutexattr_t *attr, int *type)
+{
+  if (attr && type)
+    {
+      *type = attr->type;
+      return 0;
+    }
+  return EINVAL;
+}
+
+#endif /* CONFIG_MUTEX_TYPES */
diff --git a/nuttx/lib/pthread/pthread_mutexattrinit.c b/nuttx/lib/pthread/pthread_mutexattrinit.c
new file mode 100644
index 000000000..f815bf16c
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_mutexattrinit.c
@@ -0,0 +1,106 @@
+/****************************************************************************
+ * lib/pthread/pthread_mutexattrinit.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <errno.h>
+#include <debug.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_mutexattr_init
+ *
+ * Description:
+ *    Create mutex attributes.
+ *
+ * Parameters:
+ *    attr
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_mutexattr_init(FAR pthread_mutexattr_t *attr)
+{
+  int ret = OK;
+
+  sdbg("attr=0x%p\n", attr);
+
+  if (!attr)
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->pshared = 0;
+#ifdef CONFIG_MUTEX_TYPES
+      attr->type    = PTHREAD_MUTEX_DEFAULT;
+#endif
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_mutexattrsetpshared.c b/nuttx/lib/pthread/pthread_mutexattrsetpshared.c
new file mode 100644
index 000000000..900476fdd
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_mutexattrsetpshared.c
@@ -0,0 +1,104 @@
+/****************************************************************************
+ * lib/pthread/pthread_mutexattrsetpshared.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <pthread.h>
+#include <errno.h>
+#include <debug.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  pthread_mutexattr_setpshared
+ *
+ * Description:
+ *    Set pshared  mutex attribute.
+ *
+ * Parameters:
+ *    attr
+ *    pshared
+ *
+ * Return Value:
+ *   0 if successful.  Otherwise, an error code.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_mutexattr_setpshared(FAR pthread_mutexattr_t *attr, int pshared)
+{
+  int ret = OK;
+
+  sdbg("attr=0x%p pshared=%d\n", attr, pshared);
+
+  if (!attr || (pshared != 0 && pshared != 1))
+    {
+      ret = EINVAL;
+    }
+  else
+    {
+      attr->pshared = pshared;
+    }
+
+  sdbg("Returning %d\n", ret);
+  return ret;
+}
diff --git a/nuttx/lib/pthread/pthread_mutexattrsettype.c b/nuttx/lib/pthread/pthread_mutexattrsettype.c
new file mode 100644
index 000000000..81427c757
--- /dev/null
+++ b/nuttx/lib/pthread/pthread_mutexattrsettype.c
@@ -0,0 +1,98 @@
+/****************************************************************************
+ * lib/pthread/pthread_mutexattrsettype.c
+ *
+ *   Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <pthread.h>
+#include <errno.h>
+
+#ifdef CONFIG_MUTEX_TYPES
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: pthread_mutexattr_settype
+ *
+ * Description:
+ *   Set the mutex type in the mutex attributes.
+ *
+ * Parameters:
+ *   attr - The mutex attributes in which to set the mutex type.
+ *   type - The mutex type value to set.
+ *
+ * Return Value:
+ *   0, if the mutex type was successfully set in 'attr', or
+ *   EINVAL, if 'attr' is NULL or 'type' unrecognized.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type)
+{
+  if (attr && type >= PTHREAD_MUTEX_NORMAL && type <= PTHREAD_MUTEX_RECURSIVE)
+    {
+      attr->type = type;
+      return OK;
+    }
+  return EINVAL;
+}
+
+#endif /* CONFIG_MUTEX_TYPES */
diff --git a/nuttx/lib/queue/Make.defs b/nuttx/lib/queue/Make.defs
new file mode 100644
index 000000000..976e7a2b8
--- /dev/null
+++ b/nuttx/lib/queue/Make.defs
@@ -0,0 +1,47 @@
+############################################################################
+# lib/queue/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the queue C files to the build
+
+CSRCS += sq_addlast.c sq_addfirst.c sq_addafter.c \
+		  sq_rem.c sq_remlast.c sq_remfirst.c sq_remafter.c
+
+CSRCS += dq_addlast.c dq_addfirst.c dq_addafter.c dq_addbefore.c \
+		  dq_rem.c dq_remlast.c dq_remfirst.c
+
+# Add the queue directory to the build
+
+DEPPATH += --dep-path queue
+VPATH += :queue
diff --git a/nuttx/lib/queue/dq_addafter.c b/nuttx/lib/queue/dq_addafter.c
new file mode 100644
index 000000000..bfbe0052d
--- /dev/null
+++ b/nuttx/lib/queue/dq_addafter.c
@@ -0,0 +1,74 @@
+/************************************************************
+ * lib/queue/dq_addafter.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: dq_addafter
+ *
+ * Description:
+ *  dq_addafter function adds 'node' after 'qqqq' in the
+ *  'queue.'
+ *
+ ************************************************************/
+
+void dq_addafter(FAR dq_entry_t *prev, FAR dq_entry_t *node,
+                 dq_queue_t *queue)
+{
+  if (!queue->head || prev == queue->tail)
+    {
+      dq_addlast(node, queue);
+    }
+  else
+    {
+      FAR dq_entry_t *next = prev->flink;
+      node->blink = prev;
+      node->flink = next;
+      next->blink = node;
+      prev->flink = node;
+    }
+}
diff --git a/nuttx/lib/queue/dq_addbefore.c b/nuttx/lib/queue/dq_addbefore.c
new file mode 100644
index 000000000..d740ea830
--- /dev/null
+++ b/nuttx/lib/queue/dq_addbefore.c
@@ -0,0 +1,69 @@
+/****************************************************************************
+ * lib/queue/dq_addbefore.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <queue.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dq_addbefore
+ *
+ * Description:
+ *   dq_addbefore adds 'node' before 'next' in 'queue'
+ *
+ ****************************************************************************/
+
+void dq_addbefore(FAR dq_entry_t *next, FAR dq_entry_t *node,
+                  dq_queue_t *queue)
+{
+  if (!queue->head || next == queue->head)
+    {
+      dq_addfirst(node, queue);
+    }
+  else
+    {
+      FAR dq_entry_t *prev = next->blink;
+      node->flink = next;
+      node->blink = prev;
+      prev->flink = node;
+      next->blink = node;
+    }
+}
diff --git a/nuttx/lib/queue/dq_addfirst.c b/nuttx/lib/queue/dq_addfirst.c
new file mode 100644
index 000000000..7c7312de3
--- /dev/null
+++ b/nuttx/lib/queue/dq_addfirst.c
@@ -0,0 +1,74 @@
+/************************************************************
+ * lib/queue/dq_addfirst.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: dq_addfirst
+ *
+ * Description:
+ *  dq_addfirst affs 'node' at the beginning of 'queue'
+ *
+ ************************************************************/
+
+void dq_addfirst(FAR dq_entry_t *node, dq_queue_t *queue)
+{
+  node->blink = NULL;
+  node->flink = queue->head;
+
+  if (!queue->head)
+    {
+      queue->head = node;
+      queue->tail = node;
+    }
+  else
+    {
+      queue->head->blink = node;
+      queue->head = node;
+    }
+}
+
diff --git a/nuttx/lib/queue/dq_addlast.c b/nuttx/lib/queue/dq_addlast.c
new file mode 100644
index 000000000..745deb27d
--- /dev/null
+++ b/nuttx/lib/queue/dq_addlast.c
@@ -0,0 +1,74 @@
+/************************************************************
+ * lib/queue/dq_addlast.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: dq_addlast
+ *
+ * Description
+ *   dq_addlast adds 'node' to the end of 'queue'
+ *
+ ************************************************************/
+
+void dq_addlast(FAR dq_entry_t *node, dq_queue_t *queue)
+{
+  node->flink = NULL;
+  node->blink = queue->tail;
+
+  if (!queue->head)
+    {
+      queue->head = node;
+      queue->tail = node;
+    }
+  else
+    {
+      queue->tail->flink = node;
+      queue->tail        = node;
+    }
+}
+
diff --git a/nuttx/lib/queue/dq_rem.c b/nuttx/lib/queue/dq_rem.c
new file mode 100644
index 000000000..218427bf8
--- /dev/null
+++ b/nuttx/lib/queue/dq_rem.c
@@ -0,0 +1,84 @@
+/************************************************************
+ * lib/queue/dq_rem.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: dq_rem
+ *
+ * Descripton:
+ *   dq_rem removes 'node' from 'queue'
+ *
+ ************************************************************/
+
+void dq_rem(FAR dq_entry_t *node, dq_queue_t *queue)
+{
+  FAR dq_entry_t *prev = node->blink;
+  FAR dq_entry_t *next = node->flink;
+
+  if (!prev)
+    {
+      queue->head = next;
+    }
+  else 
+    {
+      prev->flink = next;
+    }
+
+  if (!next)
+    {
+      queue->tail = prev;
+    }
+  else 
+    {
+      next->blink = prev;
+    }
+
+  node->flink = NULL;
+  node->blink = NULL;
+}
+
diff --git a/nuttx/lib/queue/dq_remfirst.c b/nuttx/lib/queue/dq_remfirst.c
new file mode 100644
index 000000000..26c5fd7a6
--- /dev/null
+++ b/nuttx/lib/queue/dq_remfirst.c
@@ -0,0 +1,82 @@
+/************************************************************
+ * lib/queue/dq_remfirst.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: dq_remfirst
+ *
+ * Description:
+ *   dq_remfirst removes 'node' from the head of 'queue'
+ *
+ ************************************************************/
+
+FAR dq_entry_t *dq_remfirst(dq_queue_t *queue)
+{
+  FAR dq_entry_t *ret = queue->head;
+
+  if (ret)
+    {
+      FAR dq_entry_t *next = ret->flink;
+      if (!next)
+        {
+          queue->head = NULL;
+          queue->tail = NULL;
+        }
+      else
+        {
+          queue->head = next;
+          next->blink = NULL;
+        }
+
+      ret->flink = NULL;
+      ret->blink = NULL;
+    }
+
+  return ret;
+}
+
diff --git a/nuttx/lib/queue/dq_remlast.c b/nuttx/lib/queue/dq_remlast.c
new file mode 100644
index 000000000..35adc73e2
--- /dev/null
+++ b/nuttx/lib/queue/dq_remlast.c
@@ -0,0 +1,78 @@
+/****************************************************************************
+ * lib/queue/dq_remlast.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <queue.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/***************************************************(************************
+ * Name: dq_remlast
+ *
+ * Description:
+ *   dq_remlast removes the last entry from 'queue'
+ *
+ ****************************************************************************/
+
+FAR dq_entry_t *dq_remlast(dq_queue_t *queue)
+{
+  FAR dq_entry_t *ret = queue->tail;
+
+  if (ret)
+    {
+      FAR dq_entry_t *prev = ret->blink;
+      if (!prev)
+        {
+          queue->head = NULL;
+          queue->tail = NULL;
+        }
+      else
+        {
+          queue->tail = prev;
+          prev->flink = NULL;
+        }
+
+      ret->flink = NULL;
+      ret->blink = NULL;
+    }
+
+  return ret;
+}
+
diff --git a/nuttx/lib/queue/sq_addafter.c b/nuttx/lib/queue/sq_addafter.c
new file mode 100644
index 000000000..965ac2844
--- /dev/null
+++ b/nuttx/lib/queue/sq_addafter.c
@@ -0,0 +1,71 @@
+/************************************************************
+ * lib/queue/sq_addafter.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: sq_addafter.c
+ *
+ * Description:
+ *  The sq_addafter function adds 'node' after 'prev' in the
+ *  'queue.'
+ *
+ ************************************************************/
+
+void sq_addafter(FAR sq_entry_t *prev, FAR sq_entry_t *node,
+                 sq_queue_t *queue)
+{
+  if (!queue->head || prev == queue->tail)
+    {
+      sq_addlast(node, queue);
+    }
+  else
+    {
+      node->flink = prev->flink;
+      prev->flink = node;
+    }
+}
diff --git a/nuttx/lib/queue/sq_addfirst.c b/nuttx/lib/queue/sq_addfirst.c
new file mode 100644
index 000000000..8fc8e0619
--- /dev/null
+++ b/nuttx/lib/queue/sq_addfirst.c
@@ -0,0 +1,67 @@
+/************************************************************
+ * lib/queue/sq_addfirst.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: sq_addfirst
+ *
+ * Description:
+ *   The sq_addfirst function places the 'node' at the head
+ *   of the 'queue'
+ *
+ ************************************************************/
+
+void sq_addfirst(FAR sq_entry_t *node, sq_queue_t *queue)
+{
+  node->flink = queue->head;
+  if (!queue->head)
+    {
+      queue->tail = node;
+    }
+  queue->head = node;
+}
diff --git a/nuttx/lib/queue/sq_addlast.c b/nuttx/lib/queue/sq_addlast.c
new file mode 100644
index 000000000..f9f9625cc
--- /dev/null
+++ b/nuttx/lib/queue/sq_addlast.c
@@ -0,0 +1,72 @@
+/************************************************************
+ * lib/queue/sq_addlast.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: sq_addlast
+ *
+ * Description:
+ *   The sq_addlast function places the 'node' at the tail of
+ *   the 'queue'
+ ************************************************************/
+
+void sq_addlast(FAR sq_entry_t *node, sq_queue_t *queue)
+{
+  node->flink = NULL;
+  if (!queue->head)
+    {
+      queue->head = node;
+      queue->tail = node;
+    }
+  else
+    {
+      queue->tail->flink = node;
+      queue->tail        = node;
+    }
+}
+
diff --git a/nuttx/lib/queue/sq_rem.c b/nuttx/lib/queue/sq_rem.c
new file mode 100644
index 000000000..6ba52354d
--- /dev/null
+++ b/nuttx/lib/queue/sq_rem.c
@@ -0,0 +1,83 @@
+/************************************************************
+ * lib/queue/sq_rem.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: sq_rem
+ *
+ * Description:
+ *   sq_rem removes a 'node' for 'queue.'
+ *
+ ************************************************************/
+
+void sq_rem(FAR sq_entry_t *node, sq_queue_t *queue)
+{
+  if (queue->head && node)
+    {
+      if (node == queue->head)
+        {
+          queue->head = node->flink;
+          if (node == queue->tail)
+            {
+              queue->tail = NULL;
+            }
+        }
+      else
+        {
+          FAR sq_entry_t *prev;
+          for(prev = (FAR sq_entry_t*)queue->head;
+              prev && prev->flink != node;
+              prev = prev->flink);
+
+          if (prev)
+            {
+              sq_remafter(prev, queue);
+            }
+        }
+    }
+}
diff --git a/nuttx/lib/queue/sq_remafter.c b/nuttx/lib/queue/sq_remafter.c
new file mode 100644
index 000000000..4dcfb06e4
--- /dev/null
+++ b/nuttx/lib/queue/sq_remafter.c
@@ -0,0 +1,79 @@
+/************************************************************
+ * lib/queue/sq_remafter.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name:
+ *
+ * Description:
+ *   sq_remafter removes the entry following 'node; from the
+ *   'queue'  Returns a reference to the removed entry.
+ *
+ ************************************************************/
+
+FAR sq_entry_t *sq_remafter(FAR sq_entry_t *node, sq_queue_t *queue)
+{
+  FAR sq_entry_t *ret = node->flink;
+  if (queue->head && ret)
+    {
+      if (queue->tail == ret)
+        {
+          queue->tail = node;
+          node->flink = NULL;
+        }
+      else
+        {
+          node->flink = ret->flink;
+        }
+
+      ret->flink = NULL;
+    }
+
+  return ret;
+}
+
diff --git a/nuttx/lib/queue/sq_remfirst.c b/nuttx/lib/queue/sq_remfirst.c
new file mode 100644
index 000000000..43df6de41
--- /dev/null
+++ b/nuttx/lib/queue/sq_remfirst.c
@@ -0,0 +1,76 @@
+/************************************************************
+ * lib/queue/sq_remfirst.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: sq_remfirst
+ *
+ * Description:
+ *   sq_remfirst function removes the first entry from
+ *   'queue'
+ *
+ ************************************************************/
+
+FAR sq_entry_t *sq_remfirst(sq_queue_t *queue)
+{
+  FAR sq_entry_t *ret = queue->head;
+
+  if (ret)
+    {
+      queue->head = ret->flink;
+      if (!queue->head)
+        {
+          queue->tail = NULL;
+        }
+
+      ret->flink = NULL;
+    }
+
+  return ret;
+}
+
diff --git a/nuttx/lib/queue/sq_remlast.c b/nuttx/lib/queue/sq_remlast.c
new file mode 100644
index 000000000..92cdbde98
--- /dev/null
+++ b/nuttx/lib/queue/sq_remlast.c
@@ -0,0 +1,87 @@
+/************************************************************
+ * lib/queue/sq_remlast.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: sq_remlast
+ *
+ * Description:
+ *   Removes the last entry in a singly-linked queue.
+ *
+ ************************************************************/
+
+FAR sq_entry_t *sq_remlast(sq_queue_t *queue)
+{ 
+  FAR sq_entry_t *ret = queue->tail;
+
+  if (ret)
+    {
+      if (queue->head == queue->tail)
+        {
+          queue->head = NULL;
+          queue->tail = NULL;
+        }
+      else
+        {
+          FAR sq_entry_t *prev;
+          for(prev = queue->head;
+              prev && prev->flink != ret;
+              prev = prev->flink);
+
+          if (prev)
+            {
+              prev->flink = NULL;
+              queue->tail = prev;
+            }
+        }
+
+      ret->flink = NULL;
+    }
+
+  return ret;
+} 
diff --git a/nuttx/lib/sched/Make.defs b/nuttx/lib/sched/Make.defs
new file mode 100644
index 000000000..f398b755e
--- /dev/null
+++ b/nuttx/lib/sched/Make.defs
@@ -0,0 +1,43 @@
+############################################################################
+# lib/sched/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the sched C files to the build
+
+CSRCS += sched_getprioritymax.c sched_getprioritymin.c
+
+# Add the sched directory to the build
+
+DEPPATH += --dep-path sched
+VPATH += :sched
diff --git a/nuttx/lib/sched/sched_getprioritymax.c b/nuttx/lib/sched/sched_getprioritymax.c
new file mode 100644
index 000000000..14b368dfc
--- /dev/null
+++ b/nuttx/lib/sched/sched_getprioritymax.c
@@ -0,0 +1,100 @@
+/************************************************************************
+ * lib/sched/sched_getprioritymax.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/arch.h>
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Function Prototypes
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name:  ched_get_priority_max
+ *
+ * Description:
+ *   This function returns the value of the highest possible
+ *   task priority for a specified scheduling policy.
+ *
+ * Inputs:
+ *   policy - Scheduling policy requested.
+ *
+ * Return Value:
+ *   The maximum priority value or -1 (ERROR)
+ *   (errno is not set)
+ *
+ * Assumptions:
+ *
+ ************************************************************************/
+
+int sched_get_priority_max(int policy)
+{
+  if (policy != SCHED_FIFO && policy != SCHED_RR)
+    {
+      return ERROR;
+    }
+  else
+    {
+      return SCHED_PRIORITY_MAX;
+    }
+}
diff --git a/nuttx/lib/sched/sched_getprioritymin.c b/nuttx/lib/sched/sched_getprioritymin.c
new file mode 100644
index 000000000..86410cb0f
--- /dev/null
+++ b/nuttx/lib/sched/sched_getprioritymin.c
@@ -0,0 +1,100 @@
+/************************************************************************
+ * lib/sched/sched_getprioritymin.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/arch.h>
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Function Prototypes
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: sched_get_priority_min
+ *
+ * Description:
+ *   This function returns the value of the lowest possible
+ *   task priority for a specified scheduling policy.
+ *
+ * Inputs:
+ *   policy - Scheduling policy requested.
+ *
+ * Return Value:
+ *   The minimum priority value or -1 (ERROR)
+ *   (errno is not set)
+ *
+ * Assumptions:
+ *
+ ************************************************************************/
+
+int sched_get_priority_min(int policy)
+{ 
+  if (policy != SCHED_FIFO && policy != SCHED_RR)
+    {
+      return ERROR;
+    }
+  else
+    {
+      return SCHED_PRIORITY_MIN;
+    }
+}
diff --git a/nuttx/lib/semaphore/Make.defs b/nuttx/lib/semaphore/Make.defs
new file mode 100644
index 000000000..fdc0fe7d5
--- /dev/null
+++ b/nuttx/lib/semaphore/Make.defs
@@ -0,0 +1,43 @@
+############################################################################
+# lib/semaphore/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the semaphore C files to the build
+
+CSRCS += sem_init.c sem_getvalue.c
+
+# Add the semaphore directory to the build
+
+DEPPATH += --dep-path semaphore
+VPATH += :semaphore
diff --git a/nuttx/lib/semaphore/sem_getvalue.c b/nuttx/lib/semaphore/sem_getvalue.c
new file mode 100644
index 000000000..31c6bb7e0
--- /dev/null
+++ b/nuttx/lib/semaphore/sem_getvalue.c
@@ -0,0 +1,108 @@
+/****************************************************************************
+ * lib/semaphore/sem_getvalue.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <semaphore.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  sem_getvalue
+ *
+ * Description:
+ *   This function updates the location referenced by 'sval' argument to
+ *   have the value of the semaphore referenced by 'sem' without effecting
+ *   the state of the semaphore.  The updated value represents the actual
+ *   semaphore value that occurred at some unspecified time during the call,
+ *   but may not reflect the actual value of the semaphore when it is
+ *   returned to the calling task.
+ *
+ *   If 'sem' is locked, the value return by sem_getvalue() will either be
+ *   zero or a negative number whose absolute value represents the number
+ *   of tasks waiting for the semaphore.
+ *
+ * Parameters:
+ *   sem - Semaphore descriptor
+ *   sval - Buffer by which the value is returned
+ *
+ * Return Value:
+ *   0 (OK), or -1 (ERROR) if unsuccessful
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int sem_getvalue(FAR sem_t *sem, FAR int *sval)
+{
+  if (sem && sval)
+    {
+      *sval = sem->semcount;
+      return OK;
+    }
+  else
+    {
+      set_errno(EINVAL);
+	  return ERROR;
+    }
+}
diff --git a/nuttx/lib/semaphore/sem_init.c b/nuttx/lib/semaphore/sem_init.c
new file mode 100644
index 000000000..bc14415f9
--- /dev/null
+++ b/nuttx/lib/semaphore/sem_init.c
@@ -0,0 +1,125 @@
+/****************************************************************************
+ * lib/sem/sem_init.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <limits.h>
+#include <semaphore.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sem_init
+ *
+ * Description:
+ *   This function initializes the UNAMED semaphore sem. Following a
+ *   successful call to sem_init(), the semaophore may be used in subsequent
+ *   calls to sem_wait(), sem_post(), and sem_trywait().  The semaphore
+ *   remains usable until it is destroyed.
+ *
+ *   Only sem itself may be used for performing synchronization. The result
+ *   of referring to copies of sem in calls to sem_wait(), sem_trywait(),
+ *   sem_post(), and sem_destroy() is undefined.
+ *
+ * Parameters:
+ *   sem - Semaphore to be initialized
+ *   pshared - Process sharing (not used)
+ *   value - Semaphore initialization value
+ *
+ * Return Value:
+ *   0 (OK), or -1 (ERROR) if unsuccessful.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int sem_init(FAR sem_t *sem, int pshared, unsigned int value)
+{
+  /* Verify that a semaphore was provided and the count is within the valid
+   * range.
+   */
+
+  if (sem && value <= SEM_VALUE_MAX)
+    {
+      /* Initialize the seamphore count */
+
+      sem->semcount      = (int16_t)value;
+
+      /* Initialize to support priority inheritance */
+
+#ifdef CONFIG_PRIORITY_INHERITANCE
+#  if CONFIG_SEM_PREALLOCHOLDERS > 0
+      sem->hhead         = NULL;
+#  else
+      sem->holder.htcb   = NULL;
+      sem->holder.counts = 0;
+#  endif
+#endif
+      return OK;
+    }
+  else
+    {
+      set_errno(EINVAL);
+      return ERROR;
+    }
+}
diff --git a/nuttx/lib/signal/Make.defs b/nuttx/lib/signal/Make.defs
new file mode 100644
index 000000000..e27da9b2e
--- /dev/null
+++ b/nuttx/lib/signal/Make.defs
@@ -0,0 +1,47 @@
+############################################################################
+# lib/signal/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+ifneq ($(CONFIG_DISABLE_SIGNALS),y)
+
+# Add the signal C files to the build
+
+CSRCS += sig_emptyset.c sig_fillset.c sig_addset.c sig_delset.c sig_ismember.c
+
+# Add the signal directory to the build
+
+DEPPATH += --dep-path signal
+VPATH += :signal
+
+endif
diff --git a/nuttx/lib/signal/sig_addset.c b/nuttx/lib/signal/sig_addset.c
new file mode 100644
index 000000000..19ba0cb6b
--- /dev/null
+++ b/nuttx/lib/signal/sig_addset.c
@@ -0,0 +1,100 @@
+/****************************************************************************
+ * lib/signal/sig_addset.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <signal.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sigaddset
+ *
+ * Description:
+ *   This function adds the signal specified by signo to the signal set
+ *   specified by set.
+ *
+ * Parameters:
+ *   set - Signal set to add signal to
+ *   signo - Signal to add
+ *
+ * Return Value:
+ *   0 (OK), or -1 (ERROR) if the signal number is invalid.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int sigaddset(FAR sigset_t *set, int signo)
+{
+  int ret = ERROR;
+
+  /* Verify the signal */
+
+  if (GOOD_SIGNO(signo))
+    {
+      /* Add the signal to the set */
+
+      *set |= SIGNO2SET(signo);
+      ret = OK;
+    }
+
+  return ret;
+}
+
diff --git a/nuttx/lib/signal/sig_delset.c b/nuttx/lib/signal/sig_delset.c
new file mode 100644
index 000000000..1c661d37f
--- /dev/null
+++ b/nuttx/lib/signal/sig_delset.c
@@ -0,0 +1,100 @@
+/****************************************************************************
+ * lib/signal/sig_delset.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <signal.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sigdelset
+ *
+ * Description:
+ *   This function deletes the signal specified by signo from the signal
+ *   set specified by the 'set' argument.
+ *
+ * Parameters:
+ *   set - Signal set to delete the signal from
+ *   signo - Signal to delete
+ *
+ * Return Value:
+ *   0 (OK), or -1 (ERROR) if the signal number is invalid.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int sigdelset(FAR sigset_t *set, int signo)
+{
+  int ret = ERROR;
+
+  /* Verify the signal */
+
+  if (GOOD_SIGNO(signo))
+    {
+      /* Delete the signal to the set */
+
+      *set &= ~SIGNO2SET(signo);
+      ret = OK;
+    }
+
+  return ret;
+}
+
diff --git a/nuttx/lib/signal/sig_emptyset.c b/nuttx/lib/signal/sig_emptyset.c
new file mode 100644
index 000000000..ac0c6b3e8
--- /dev/null
+++ b/nuttx/lib/signal/sig_emptyset.c
@@ -0,0 +1,88 @@
+/****************************************************************************
+ * lib/signal/sig_emptyset.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <signal.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sigemptyset
+ *
+ * Description:
+ *   This function initializes the signal set specified by set such that all
+ *   signals are excluded.
+ *
+ * Parameters:
+ *   set - Signal set to initalize
+ *
+ * Return Value:
+ *   0 (OK), or -1 (ERROR) if the signal set cannot be initialized.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int sigemptyset(FAR sigset_t *set)
+{
+  *set = NULL_SIGNAL_SET;
+  return OK;
+}
+
diff --git a/nuttx/lib/signal/sig_fillset.c b/nuttx/lib/signal/sig_fillset.c
new file mode 100644
index 000000000..8697d7577
--- /dev/null
+++ b/nuttx/lib/signal/sig_fillset.c
@@ -0,0 +1,88 @@
+/****************************************************************************
+ * lib/signal/sig_fillset.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <signal.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Publics Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sigfillset
+ *
+ * Description:
+ *   This function initializes the signal set specified by set such that all
+ *   signals are included.
+ *
+ * Parameters:
+ *   set - Signal set to initalize
+ *
+ * Return Value:
+ *   0 (OK), or -1 (ERROR) if the signal set cannot be initialized.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int sigfillset(FAR sigset_t *set)
+{
+  *set = ALL_SIGNAL_SET;
+  return OK;
+}
+
diff --git a/nuttx/lib/signal/sig_ismember.c b/nuttx/lib/signal/sig_ismember.c
new file mode 100644
index 000000000..c5bb091b7
--- /dev/null
+++ b/nuttx/lib/signal/sig_ismember.c
@@ -0,0 +1,101 @@
+/****************************************************************************
+ * lib/signal/sig_ismember.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <signal.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sigismember
+ *
+ * Description:
+ *   This function tests whether the signal specified by signo is a member
+ *   of the set specified by set.
+ *
+ * Parameters:
+ *   set - Signal set to test
+ *   signo - Signal to test for
+ *
+ * Return Value:
+ *   1 (true), if the specified signal is a member of the set,
+ *   0 (OK or FALSE), if it is not, or
+ *  -1 (ERROR) if the signal number is invalid.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int sigismember(FAR const sigset_t *set, int signo)
+{
+  int ret = ERROR;
+
+  /* Verify the signal */
+
+  if (GOOD_SIGNO(signo))
+    {
+      /* Check if the signal is in the set */
+
+      ret = ((*set & SIGNO2SET(signo)) != 0);
+    }
+
+  return ret;
+}
+
diff --git a/nuttx/lib/stdio/Make.defs b/nuttx/lib/stdio/Make.defs
new file mode 100644
index 000000000..e4ee5e969
--- /dev/null
+++ b/nuttx/lib/stdio/Make.defs
@@ -0,0 +1,85 @@
+############################################################################
+# lib/stdio/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the stdio C files to the build
+# This first group of C files do not depend on having file descriptors or
+# C streams.
+
+CSRCS += lib_fileno.c lib_printf.c lib_rawprintf.c lib_lowprintf.c \
+		 lib_sprintf.c lib_asprintf.c lib_snprintf.c lib_libsprintf.c \
+		 lib_vsprintf.c lib_avsprintf.c lib_vsnprintf.c lib_libvsprintf.c \
+		 lib_meminstream.c lib_memoutstream.c lib_lowinstream.c \
+		 lib_lowoutstream.c lib_zeroinstream.c lib_nullinstream.c \
+		 lib_nulloutstream.c lib_sscanf.c
+
+# The remaining sources files depend upon file descriptors
+
+ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
+
+CSRCS += lib_rawinstream.c lib_rawoutstream.c
+
+# And these depend upon both file descriptors and C streams
+
+ifneq ($(CONFIG_NFILE_STREAMS),0)
+
+CSRCS += lib_fopen.c lib_fclose.c lib_fread.c lib_libfread.c lib_fseek.c \
+		 lib_ftell.c lib_fsetpos.c lib_fgetpos.c lib_fgetc.c lib_fgets.c \
+		 lib_gets.c lib_fwrite.c lib_libfwrite.c lib_fflush.c \
+		 lib_libflushall.c lib_libfflush.c lib_rdflush.c lib_wrflush.c \
+		 lib_fputc.c lib_puts.c lib_fputs.c lib_ungetc.c lib_vprintf.c \
+		 lib_fprintf.c lib_vfprintf.c lib_stdinstream.c lib_stdoutstream.c \
+		 lib_perror.c lib_feof.c lib_ferror.c lib_clearerr.c
+
+endif
+endif
+
+# Other support that depends on specific, configured features.
+
+ifeq ($(CONFIG_SYSLOG),y)
+CSRCS += lib_syslogstream.c
+endif
+
+ifeq ($(CONFIG_LIBC_FLOATINGPOINT),y)
+CSRCS += lib_dtoa.c
+endif
+
+ifeq ($(CONFIG_STDIO_LINEBUFFER),y)
+CSRCS += lib_libnoflush.c
+endif
+
+# Add the stdio directory to the build
+
+DEPPATH += --dep-path stdio
+VPATH += :stdio
diff --git a/nuttx/lib/stdio/lib_asprintf.c b/nuttx/lib/stdio/lib_asprintf.c
new file mode 100644
index 000000000..84aaafa46
--- /dev/null
+++ b/nuttx/lib/stdio/lib_asprintf.c
@@ -0,0 +1,105 @@
+/****************************************************************************
+ * lib/stdio/lib_asprintf.c
+ *
+ *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <stdarg.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: asprintf
+ *
+ * Description:
+ *   This function is similar to sprintf, except that it dynamically
+ *   allocates a string (as with malloc) to hold the output, instead of
+ *   putting the output in a buffer you allocate in advance.  The ptr
+ *   argument should be the address of a char * object, and a successful
+ *   call to asprintf stores a pointer to the newly allocated string at that
+ *   location.
+ *
+ * Returned Value:
+ *   The returned value is the number of characters allocated for the buffer,
+ *   or less than zero if an error occurred. Usually this means that the buffer
+ *   could not be allocated.
+ *
+ ****************************************************************************/
+
+int asprintf (FAR char **ptr, const char *fmt, ...)
+{
+  va_list ap;
+  int ret;
+
+  /* Let avsprintf do all of the work */
+
+  va_start(ap, fmt);
+  ret = avsprintf(ptr, fmt, ap);
+  va_end(ap);
+
+  return ret;
+}
diff --git a/nuttx/lib/stdio/lib_avsprintf.c b/nuttx/lib/stdio/lib_avsprintf.c
new file mode 100644
index 000000000..8561b97c2
--- /dev/null
+++ b/nuttx/lib/stdio/lib_avsprintf.c
@@ -0,0 +1,146 @@
+/****************************************************************************
+ * lib/stdio/lib_avsprintf.c
+ *
+ *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <assert.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: avsprintf
+ *
+ * Description:
+ *   This function is similar to vsprintf, except that it dynamically
+ *   allocates a string (as with malloc) to hold the output, instead of
+ *   putting the output in a buffer you allocate in advance.  The ptr
+ *   argument should be the address of a char * object, and a successful
+ *   call to avsprintf stores a pointer to the newly allocated string at that
+ *   location.
+ *
+ * Returned Value:
+ *   The returned value is the number of characters allocated for the buffer,
+ *   or less than zero if an error occurred. Usually this means that the buffer
+ *   could not be allocated.
+ *
+ ****************************************************************************/
+
+int avsprintf(FAR char **ptr, const char *fmt, va_list ap)
+{
+  struct lib_outstream_s nulloutstream;
+  struct lib_memoutstream_s memoutstream;
+  FAR char *buf;
+  int nbytes;
+
+  DEBUGASSERT(ptr && fmt);
+
+  /* First, use a nullstream to get the size of the buffer.  The number
+   * of bytes returned may or may not include the null terminator.
+   */
+  
+  lib_nulloutstream(&nulloutstream);
+  nbytes = lib_vsprintf((FAR struct lib_outstream_s *)&nulloutstream, fmt, ap);
+
+  /* Then allocate a buffer to hold that number of characters, adding one
+   * for the null terminator.
+   */
+
+  buf = (FAR char *)malloc(nulloutstream.nput + 1);
+  if (!buf)
+    {
+      return ERROR;
+    }
+
+  /* Initialize a memory stream to write into the allocated buffer.  The
+   * memory stream will reserve one byte at the end of the buffer for the
+   * null terminator and will not report this in the number of output bytes.
+   */
+
+  lib_memoutstream((FAR struct lib_memoutstream_s *)&memoutstream,
+                   buf, nulloutstream.nput + 1);
+
+  /* Then let lib_vsprintf do it's real thing */
+
+  nbytes = lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public, fmt, ap);
+
+  /* Return a pointer to the string to the caller.  NOTE: the memstream put()
+   * method has already added the NUL terminator to the end of the string (not
+   * included in the nput count).
+   *
+   * Hmmm.. looks like the memory would be stranded if lib_vsprintf() returned
+   * an error.  Does that ever happen?
+   */
+
+  DEBUGASSERT(nbytes < 0 || nbytes == nulloutstream.nput);
+  *ptr = buf;
+  return nbytes;
+}
diff --git a/nuttx/lib/stdio/lib_clearerr.c b/nuttx/lib/stdio/lib_clearerr.c
new file mode 100644
index 000000000..7f7ded5bb
--- /dev/null
+++ b/nuttx/lib/stdio/lib_clearerr.c
@@ -0,0 +1,69 @@
+/****************************************************************************
+ * lib/stdio/lib_clearerr.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#if CONFIG_NFILE_STREAMS > 0
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: Functions
+ *
+ * Description:
+ *   Clear any end-of-file or error conditions.
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void clearerr(FILE *stream)
+{
+  stream->fs_flags = 0;
+}
+#endif /* CONFIG_NFILE_STREAMS */
+
diff --git a/nuttx/lib/stdio/lib_dtoa.c b/nuttx/lib/stdio/lib_dtoa.c
new file mode 100644
index 000000000..b8c7db980
--- /dev/null
+++ b/nuttx/lib/stdio/lib_dtoa.c
@@ -0,0 +1,1641 @@
+/****************************************************************************
+ * lib/stdio/lib_dtoa.c
+ *
+ * This file was ported to NuttX by Yolande Cates.
+ *
+ * Copyright (c) 1990, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <string.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifdef Unsigned_Shifts
+#  define Sign_Extend(a,b) if (b < 0) a |= 0xffff0000;
+#else
+#  define Sign_Extend(a,b)      /* no-op */
+#endif
+
+#ifdef CONFIG_ENDIAN_BIG
+#  define word0(x) ((uint32_t *)&x)[0]
+#  define word1(x) ((uint32_t *)&x)[1]
+#else
+#  define word0(x) ((uint32_t *)&x)[1]
+#  define word1(x) ((uint32_t *)&x)[0]
+#endif
+
+#ifdef CONFIG_ENDIAN_BIG
+#  define Storeinc(a,b,c) (((unsigned short *)a)[0] = (unsigned short)b, \
+                         ((unsigned short *)a)[1] = (unsigned short)c, a++)
+#else
+#  define Storeinc(a,b,c) (((unsigned short *)a)[1] = (unsigned short)b, \
+                         ((unsigned short *)a)[0] = (unsigned short)c, a++)
+#endif
+
+#define Exp_shift  20
+#define Exp_shift1 20
+#define Exp_msk1    0x100000
+#define Exp_msk11   0x100000
+#define Exp_mask  0x7ff00000
+#define P 53
+#define Bias 1023
+#define IEEE_Arith
+#define Emin (-1022)
+#define Exp_1  0x3ff00000
+#define Exp_11 0x3ff00000
+#define Ebits 11
+#define Frac_mask  0xfffff
+#define Frac_mask1 0xfffff
+#define Ten_pmax 22
+#define Bletch 0x10
+#define Bndry_mask  0xfffff
+#define Bndry_mask1 0xfffff
+#define LSB 1
+#define Sign_bit 0x80000000
+#define Log2P 1
+#define Tiny0 0
+#define Tiny1 1
+#define Quick_max 14
+#define Int_max 14
+#define Infinite(x) (word0(x) == 0x7ff00000)    /* sufficient test for here */
+
+#define Kmax 15
+
+#define Bcopy(x,y) memcpy((char *)&x->sign, (char *)&y->sign, \
+                          y->wds*sizeof(long) + 2*sizeof(int))
+
+/****************************************************************************
+ * Private Type Definitions
+ ****************************************************************************/
+
+struct Bigint
+{
+  struct Bigint *next;
+  int k, maxwds, sign, wds;
+  unsigned long x[1];
+};
+
+typedef struct Bigint Bigint;
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static Bigint *freelist[Kmax + 1];
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static Bigint *Balloc(int k)
+{
+  int x;
+  Bigint *rv;
+
+  if ((rv = freelist[k]))
+    {
+      freelist[k] = rv->next;
+    }
+  else
+    {
+      x = 1 << k;
+      rv = (Bigint *)lib_malloc(sizeof(Bigint) + (x - 1) * sizeof(long));
+      rv->k = k;
+      rv->maxwds = x;
+    }
+  rv->sign = rv->wds = 0;
+  return rv;
+}
+
+static void Bfree(Bigint * v)
+{
+  if (v)
+    {
+      v->next = freelist[v->k];
+      freelist[v->k] = v;
+    }
+}
+
+/* multiply by m and add a */
+
+static Bigint *multadd(Bigint * b, int m, int a)
+{
+  int i, wds;
+  unsigned long *x, y;
+#ifdef Pack_32
+  unsigned long xi, z;
+#endif
+  Bigint *b1;
+
+  wds = b->wds;
+  x = b->x;
+  i = 0;
+  do
+    {
+#ifdef Pack_32
+      xi = *x;
+      y = (xi & 0xffff) * m + a;
+      z = (xi >> 16) * m + (y >> 16);
+      a = (int)(z >> 16);
+      *x++ = (z << 16) + (y & 0xffff);
+#else
+      y = *x * m + a;
+      a = (int)(y >> 16);
+      *x++ = y & 0xffff;
+#endif
+    }
+  while (++i < wds);
+  if (a)
+    {
+      if (wds >= b->maxwds)
+        {
+          b1 = Balloc(b->k + 1);
+          Bcopy(b1, b);
+          Bfree(b);
+          b = b1;
+        }
+      b->x[wds++] = a;
+      b->wds = wds;
+    }
+  return b;
+}
+
+static int hi0bits(unsigned long x)
+{
+  int k = 0;
+
+  if (!(x & 0xffff0000))
+    {
+      k = 16;
+      x <<= 16;
+    }
+
+  if (!(x & 0xff000000))
+    {
+      k += 8;
+      x <<= 8;
+    }
+
+  if (!(x & 0xf0000000))
+    {
+      k += 4;
+      x <<= 4;
+    }
+
+  if (!(x & 0xc0000000))
+    {
+      k += 2;
+      x <<= 2;
+    }
+
+  if (!(x & 0x80000000))
+    {
+      k++;
+      if (!(x & 0x40000000))
+        {
+          return 32;
+        }
+    }
+  return k;
+}
+
+static int lo0bits(unsigned long *y)
+{
+  int k;
+  unsigned long x = *y;
+
+  if (x & 7)
+    {
+      if (x & 1)
+        {
+          return 0;
+        }
+      if (x & 2)
+        {
+          *y = x >> 1;
+          return 1;
+        }
+      *y = x >> 2;
+      return 2;
+    }
+
+  k = 0;
+  if (!(x & 0xffff))
+    {
+      k = 16;
+      x >>= 16;
+    }
+
+  if (!(x & 0xff))
+    {
+      k += 8;
+      x >>= 8;
+    }
+
+  if (!(x & 0xf))
+    {
+      k += 4;
+      x >>= 4;
+    }
+
+  if (!(x & 0x3))
+    {
+      k += 2;
+      x >>= 2;
+    }
+
+  if (!(x & 1))
+    {
+      k++;
+      x >>= 1;
+      if (!x & 1)
+        {
+          return 32;
+        }
+    }
+  *y = x;
+  return k;
+}
+
+static Bigint *i2b(int i)
+{
+  Bigint *b;
+
+  b = Balloc(1);
+  b->x[0] = i;
+  b->wds = 1;
+  return b;
+}
+
+static Bigint *mult(Bigint * a, Bigint * b)
+{
+  Bigint *c;
+  int k, wa, wb, wc;
+  unsigned long carry, y, z;
+  unsigned long *x, *xa, *xae, *xb, *xbe, *xc, *xc0;
+#ifdef Pack_32
+  uint32_t z2;
+#endif
+
+  if (a->wds < b->wds)
+    {
+      c = a;
+      a = b;
+      b = c;
+    }
+
+  k = a->k;
+  wa = a->wds;
+  wb = b->wds;
+  wc = wa + wb;
+  if (wc > a->maxwds)
+    {
+      k++;
+    }
+  c = Balloc(k);
+  for (x = c->x, xa = x + wc; x < xa; x++)
+    {
+      *x = 0;
+    }
+  xa = a->x;
+  xae = xa + wa;
+  xb = b->x;
+  xbe = xb + wb;
+  xc0 = c->x;
+#ifdef Pack_32
+  for (; xb < xbe; xb++, xc0++)
+    {
+      if ((y = *xb & 0xffff))
+        {
+          x = xa;
+          xc = xc0;
+          carry = 0;
+          do
+            {
+              z = (*x & 0xffff) * y + (*xc & 0xffff) + carry;
+              carry = z >> 16;
+              z2 = (*x++ >> 16) * y + (*xc >> 16) + carry;
+              carry = z2 >> 16;
+              Storeinc(xc, z2, z);
+            }
+          while (x < xae);
+          *xc = carry;
+        }
+      if ((y = *xb >> 16))
+        {
+          x = xa;
+          xc = xc0;
+          carry = 0;
+          z2 = *xc;
+          do
+            {
+              z = (*x & 0xffff) * y + (*xc >> 16) + carry;
+              carry = z >> 16;
+              Storeinc(xc, z, z2);
+              z2 = (*x++ >> 16) * y + (*xc & 0xffff) + carry;
+              carry = z2 >> 16;
+            }
+          while (x < xae);
+          *xc = z2;
+        }
+    }
+#else
+  for (; xb < xbe; xc0++)
+    {
+      if ((y = *xb++))
+        {
+          x = xa;
+          xc = xc0;
+          carry = 0;
+          do
+            {
+              z = *x++ * y + *xc + carry;
+              carry = z >> 16;
+              *xc++ = z & 0xffff;
+            }
+          while (x < xae);
+          *xc = carry;
+        }
+    }
+#endif
+  for (xc0 = c->x, xc = xc0 + wc; wc > 0 && !*--xc; --wc);
+  c->wds = wc;
+  return c;
+}
+
+static Bigint *p5s;
+
+static Bigint *pow5mult(Bigint * b, int k)
+{
+  Bigint *b1, *p5, *p51;
+  int i;
+  static int p05[3] = { 5, 25, 125 };
+
+  if ((i = k & 3))
+    b = multadd(b, p05[i - 1], 0);
+
+  if (!(k >>= 2))
+    {
+      return b;
+    }
+
+  if (!(p5 = p5s))
+    {
+      /* first time */
+      p5 = p5s = i2b(625);
+      p5->next = 0;
+    }
+
+  for (;;)
+    {
+      if (k & 1)
+        {
+          b1 = mult(b, p5);
+          Bfree(b);
+          b = b1;
+        }
+      if (!(k >>= 1))
+        {
+          break;
+        }
+
+      if (!(p51 = p5->next))
+        {
+          p51 = p5->next = mult(p5, p5);
+          p51->next = 0;
+        }
+      p5 = p51;
+    }
+  return b;
+}
+
+static Bigint *lshift(Bigint * b, int k)
+{
+  int i, k1, n, n1;
+  Bigint *b1;
+  unsigned long *x, *x1, *xe, z;
+
+#ifdef Pack_32
+  n = k >> 5;
+#else
+  n = k >> 4;
+#endif
+  k1 = b->k;
+  n1 = n + b->wds + 1;
+  for (i = b->maxwds; n1 > i; i <<= 1)
+    {
+      k1++;
+    }
+  b1 = Balloc(k1);
+  x1 = b1->x;
+  for (i = 0; i < n; i++)
+    {
+      *x1++ = 0;
+    }
+  x = b->x;
+  xe = x + b->wds;
+#ifdef Pack_32
+  if (k &= 0x1f)
+    {
+      k1 = 32 - k;
+      z = 0;
+      do
+        {
+          *x1++ = *x << k | z;
+          z = *x++ >> k1;
+        }
+      while (x < xe);
+      if ((*x1 = z))
+        {
+          ++n1;
+        }
+    }
+#else
+  if (k &= 0xf)
+    {
+      k1 = 16 - k;
+      z = 0;
+      do
+        {
+          *x1++ = ((*x << k) & 0xffff) | z;
+          z = *x++ >> k1;
+        }
+      while (x < xe);
+      if ((*x1 = z))
+        {
+          ++n1;
+        }
+    }
+#endif
+  else
+    do
+      {
+        *x1++ = *x++;
+      }
+    while (x < xe);
+  b1->wds = n1 - 1;
+  Bfree(b);
+  return b1;
+}
+
+static int cmp(Bigint * a, Bigint * b)
+{
+  unsigned long *xa, *xa0, *xb, *xb0;
+  int i, j;
+
+  i = a->wds;
+  j = b->wds;
+#ifdef CONFIG_DEBUG_LIB
+  if (i > 1 && !a->x[i - 1])
+   {
+    ldbg("cmp called with a->x[a->wds-1] == 0\n");
+   }
+  if (j > 1 && !b->x[j - 1])
+   {
+    ldbg("cmp called with b->x[b->wds-1] == 0\n");
+   }
+#endif
+  if (i -= j)
+    return i;
+  xa0 = a->x;
+  xa = xa0 + j;
+  xb0 = b->x;
+  xb = xb0 + j;
+  for (;;)
+    {
+      if (*--xa != *--xb)
+        return *xa < *xb ? -1 : 1;
+      if (xa <= xa0)
+        break;
+    }
+  return 0;
+}
+
+static Bigint *diff(Bigint * a, Bigint * b)
+{
+  Bigint *c;
+  int i, wa, wb;
+  long borrow, y;               /* We need signed shifts here. */
+  unsigned long *xa, *xae, *xb, *xbe, *xc;
+#ifdef Pack_32
+  int32_t z;
+#endif
+
+  i = cmp(a, b);
+  if (!i)
+    {
+      c = Balloc(0);
+      c->wds = 1;
+      c->x[0] = 0;
+      return c;
+    }
+  if (i < 0)
+    {
+      c = a;
+      a = b;
+      b = c;
+      i = 1;
+    }
+  else
+    i = 0;
+  c = Balloc(a->k);
+  c->sign = i;
+  wa = a->wds;
+  xa = a->x;
+  xae = xa + wa;
+  wb = b->wds;
+  xb = b->x;
+  xbe = xb + wb;
+  xc = c->x;
+  borrow = 0;
+#ifdef Pack_32
+  do
+    {
+      y = (*xa & 0xffff) - (*xb & 0xffff) + borrow;
+      borrow = y >> 16;
+      Sign_Extend(borrow, y);
+      z = (*xa++ >> 16) - (*xb++ >> 16) + borrow;
+      borrow = z >> 16;
+      Sign_Extend(borrow, z);
+      Storeinc(xc, z, y);
+    }
+  while (xb < xbe);
+  while (xa < xae)
+    {
+      y = (*xa & 0xffff) + borrow;
+      borrow = y >> 16;
+      Sign_Extend(borrow, y);
+      z = (*xa++ >> 16) + borrow;
+      borrow = z >> 16;
+      Sign_Extend(borrow, z);
+      Storeinc(xc, z, y);
+    }
+#else
+  do
+    {
+      y = *xa++ - *xb++ + borrow;
+      borrow = y >> 16;
+      Sign_Extend(borrow, y);
+      *xc++ = y & 0xffff;
+    }
+  while (xb < xbe);
+  while (xa < xae)
+    {
+      y = *xa++ + borrow;
+      borrow = y >> 16;
+      Sign_Extend(borrow, y);
+      *xc++ = y & 0xffff;
+    }
+#endif
+  while (!*--xc)
+    wa--;
+  c->wds = wa;
+  return c;
+}
+
+static Bigint *d2b(double d, int *e, int *bits)
+{
+  Bigint *b;
+  int de, i, k;
+  unsigned long *x, y, z;
+
+#ifdef Pack_32
+  b = Balloc(1);
+#else
+  b = Balloc(2);
+#endif
+  x = b->x;
+
+  z = word0(d) & Frac_mask;
+  word0(d) &= 0x7fffffff;       /* clear sign bit, which we ignore */
+  if ((de = (int)(word0(d) >> Exp_shift)))
+    z |= Exp_msk1;
+#ifdef Pack_32
+  if ((y = word1(d)))
+    {
+      if ((k = lo0bits(&y)))
+        {
+          x[0] = y | z << (32 - k);
+          z >>= k;
+        }
+      else
+        x[0] = y;
+      i = b->wds = (x[1] = z) ? 2 : 1;
+    }
+  else
+    {
+#ifdef CONFIG_DEBUG_LIB
+      if (!z)
+        {
+          ldbg("Zero passed to d2b\n");
+        }
+#endif
+      k = lo0bits(&z);
+      x[0] = z;
+      i = b->wds = 1;
+      k += 32;
+    }
+#else
+  if ((y = word1(d)))
+    {
+      if ((k = lo0bits(&y)))
+        if (k >= 16)
+          {
+            x[0] = y | ((z << (32 - k)) & 0xffff);
+            x[1] = z >> (k - 16) & 0xffff;
+            x[2] = z >> k;
+            i = 2;
+          }
+        else
+          {
+            x[0] = y & 0xffff;
+            x[1] = (y >> 16) | ((z << (16 - k)) & 0xffff);
+            x[2] = z >> k & 0xffff;
+            x[3] = z >> (k + 16);
+            i = 3;
+          }
+      else
+        {
+          x[0] = y & 0xffff;
+          x[1] = y >> 16;
+          x[2] = z & 0xffff;
+          x[3] = z >> 16;
+          i = 3;
+        }
+    }
+  else
+    {
+#ifdef CONFIG_DEBUG_LIB
+      if (!z)
+        {
+          ldbg("Zero passed to d2b\n");
+        }
+#endif
+      k = lo0bits(&z);
+      if (k >= 16)
+        {
+          x[0] = z;
+          i = 0;
+        }
+      else
+        {
+          x[0] = z & 0xffff;
+          x[1] = z >> 16;
+          i = 1;
+        }
+      k += 32;
+    }
+  while (!x[i])
+    --i;
+  b->wds = i + 1;
+#endif
+  if (de)
+    {
+      *e = de - Bias - (P - 1) + k;
+      *bits = P - k;
+    }
+  else
+    {
+      *e = de - Bias - (P - 1) + 1 + k;
+#ifdef Pack_32
+      *bits = 32 * i - hi0bits(x[i - 1]);
+#else
+      *bits = (i + 2) * 16 - hi0bits(x[i]);
+#endif
+    }
+  return b;
+}
+
+static const double tens[] = {
+  1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
+  1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
+  1e20, 1e21, 1e22
+};
+
+#ifdef IEEE_Arith
+static const double bigtens[] = { 1e16, 1e32, 1e64, 1e128, 1e256 };
+static const double tinytens[] = { 1e-16, 1e-32, 1e-64, 1e-128, 1e-256 };
+
+#  define n_bigtens 5
+#else
+static const double bigtens[] = { 1e16, 1e32 };
+static const double tinytens[] = { 1e-16, 1e-32 };
+
+#  define n_bigtens 2
+#endif
+
+static int quorem(Bigint * b, Bigint * S)
+{
+  int n;
+  long borrow, y;
+  unsigned long carry, q, ys;
+  unsigned long *bx, *bxe, *sx, *sxe;
+#ifdef Pack_32
+  int32_t z;
+  uint32_t si, zs;
+#endif
+
+  n = S->wds;
+#ifdef CONFIG_DEBUG_LIB
+  if (b->wds > n)
+    {
+      ldbg("oversize b in quorem\n");
+    }
+#endif
+  if (b->wds < n)
+    {
+      return 0;
+    }
+  sx = S->x;
+  sxe = sx + --n;
+  bx = b->x;
+  bxe = bx + n;
+  q = *bxe / (*sxe + 1);        /* ensure q <= true quotient */
+#ifdef CONFIG_DEBUG_LIB
+  if (q > 9)
+   {
+     ldbg("oversized quotient in quorem\n");
+   }
+#endif
+  if (q)
+    {
+      borrow = 0;
+      carry = 0;
+      do
+        {
+#ifdef Pack_32
+          si = *sx++;
+          ys = (si & 0xffff) * q + carry;
+          zs = (si >> 16) * q + (ys >> 16);
+          carry = zs >> 16;
+          y = (*bx & 0xffff) - (ys & 0xffff) + borrow;
+          borrow = y >> 16;
+          Sign_Extend(borrow, y);
+          z = (*bx >> 16) - (zs & 0xffff) + borrow;
+          borrow = z >> 16;
+          Sign_Extend(borrow, z);
+          Storeinc(bx, z, y);
+#else
+          ys = *sx++ * q + carry;
+          carry = ys >> 16;
+          y = *bx - (ys & 0xffff) + borrow;
+          borrow = y >> 16;
+          Sign_Extend(borrow, y);
+          *bx++ = y & 0xffff;
+#endif
+        }
+      while (sx <= sxe);
+      if (!*bxe)
+        {
+          bx = b->x;
+          while (--bxe > bx && !*bxe)
+            --n;
+          b->wds = n;
+        }
+    }
+  if (cmp(b, S) >= 0)
+    {
+      q++;
+      borrow = 0;
+      carry = 0;
+      bx = b->x;
+      sx = S->x;
+      do
+        {
+#ifdef Pack_32
+          si = *sx++;
+          ys = (si & 0xffff) + carry;
+          zs = (si >> 16) + (ys >> 16);
+          carry = zs >> 16;
+          y = (*bx & 0xffff) - (ys & 0xffff) + borrow;
+          borrow = y >> 16;
+          Sign_Extend(borrow, y);
+          z = (*bx >> 16) - (zs & 0xffff) + borrow;
+          borrow = z >> 16;
+          Sign_Extend(borrow, z);
+          Storeinc(bx, z, y);
+#else
+          ys = *sx++ + carry;
+          carry = ys >> 16;
+          y = *bx - (ys & 0xffff) + borrow;
+          borrow = y >> 16;
+          Sign_Extend(borrow, y);
+          *bx++ = y & 0xffff;
+#endif
+        }
+      while (sx <= sxe);
+      bx = b->x;
+      bxe = bx + n;
+      if (!*bxe)
+        {
+          while (--bxe > bx && !*bxe)
+            --n;
+          b->wds = n;
+        }
+    }
+  return q;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/* dtoa for IEEE arithmetic (dmg): convert double to ASCII string.
+ *
+ * Inspired by "How to Print Floating-Point Numbers Accurately" by
+ * Guy L. Steele, Jr. and Jon L. White [Proc. ACM SIGPLAN '90, pp. 92-101].
+ *
+ * Modifications:
+ *      1. Rather than iterating, we use a simple numeric overestimate
+ *         to determine k = floor(log10(d)).  We scale relevant
+ *         quantities using O(log2(k)) rather than O(k) multiplications.
+ *      2. For some modes > 2 (corresponding to ecvt and fcvt), we don't
+ *         try to generate digits strictly left to right.  Instead, we
+ *         compute with fewer bits and propagate the carry if necessary
+ *         when rounding the final digit up.  This is often faster.
+ *      3. Under the assumption that input will be rounded nearest,
+ *         mode 0 renders 1e23 as 1e23 rather than 9.999999999999999e22.
+ *         That is, we allow equality in stopping tests when the
+ *         round-nearest rule will give the same floating-point value
+ *         as would satisfaction of the stopping test with strict
+ *         inequality.
+ *      4. We remove common factors of powers of 2 from relevant
+ *         quantities.
+ *      5. When converting floating-point integers less than 1e16,
+ *         we use floating-point arithmetic rather than resorting
+ *         to multiple-precision integers.
+ *      6. When asked to produce fewer than 15 digits, we first try
+ *         to get by with floating-point arithmetic; we resort to
+ *         multiple-precision integer arithmetic only if we cannot
+ *         guarantee that the floating-point calculation has given
+ *         the correctly rounded result.  For k requested digits and
+ *         "uniformly" distributed input, the probability is
+ *         something like 10^(k-15) that we must resort to the int32_t
+ *         calculation.
+ */
+
+char *__dtoa(double d, int mode, int ndigits, int *decpt, int *sign, char **rve)
+{
+  /* Arguments ndigits, decpt, sign are similar to those of ecvt and fcvt;
+   * trailing zeros are suppressed from the returned string.  If not null, *rve 
+   * is set to point to the end of the return value.  If d is +-Infinity or
+   * NaN, then *decpt is set to 9999.
+   * 
+   * mode: 0 ==> shortest string that yields d when read in and rounded to
+   * nearest. 1 ==> like 0, but with Steele & White stopping rule; e.g. with
+   * IEEE P754 arithmetic , mode 0 gives 1e23 whereas mode 1 gives
+   * 9.999999999999999e22. 2 ==> max(1,ndigits) significant digits.  This gives 
+   * a return value similar to that of ecvt, except that trailing zeros are
+   * suppressed. 3 ==> through ndigits past the decimal point.  This gives a
+   * return value similar to that from fcvt, except that trailing zeros are
+   * suppressed, and ndigits can be negative. 4-9 should give the same return
+   * values as 2-3, i.e., 4 <= mode <= 9 ==> same return as mode 2 + (mode &
+   * 1).  These modes are mainly for debugging; often they run slower but
+   * sometimes faster than modes 2-3. 4,5,8,9 ==> left-to-right digit
+   * generation. 6-9 ==> don't try fast floating-point estimate (if
+   * applicable).
+   * 
+   * Values of mode other than 0-9 are treated as mode 0.
+   * 
+   * Sufficient space is allocated to the return value to hold the suppressed
+   * trailing zeros. */
+
+  int bbits, b2, b5, be, dig, i, ieps, ilim = 0, ilim0, ilim1 = 0,
+    j, j_1, k, k0, k_check, leftright, m2, m5, s2, s5, spec_case = 0, try_quick;
+  long L;
+  int denorm;
+  unsigned long x;
+  Bigint *b, *b1, *delta, *mlo = NULL, *mhi, *S;
+  double d2, ds, eps;
+  char *s, *s0;
+  static Bigint *result;
+  static int result_k;
+
+  if (result)
+    {
+      result->k = result_k;
+      result->maxwds = 1 << result_k;
+      Bfree(result);
+      result = 0;
+    }
+
+  if (word0(d) & Sign_bit)
+    {
+      /* set sign for everything, including 0's and NaNs */
+      *sign = 1;
+      word0(d) &= ~Sign_bit;    /* clear sign bit */
+    }
+  else
+    {
+      *sign = 0;
+    }
+
+#if defined(IEEE_Arith)
+#  ifdef IEEE_Arith
+  if ((word0(d) & Exp_mask) == Exp_mask)
+#else
+  if (word0(d) == 0x8000)
+#endif
+    {
+      /* Infinity or NaN */
+      *decpt = 9999;
+      s =
+#ifdef IEEE_Arith
+        !word1(d) && !(word0(d) & 0xfffff) ? "Infinity" :
+#endif
+        "NaN";
+      if (rve)
+        *rve =
+#ifdef IEEE_Arith
+          s[3] ? s + 8 :
+#endif
+          s + 3;
+      return s;
+    }
+#endif
+  if (!d)
+    {
+      *decpt = 1;
+      s = "0";
+      if (rve)
+        *rve = s + 1;
+      return s;
+    }
+
+  b = d2b(d, &be, &bbits);
+  if ((i = (int)(word0(d) >> Exp_shift1 & (Exp_mask >> Exp_shift1))))
+    {
+      d2 = d;
+      word0(d2) &= Frac_mask1;
+      word0(d2) |= Exp_11;
+
+      /* log(x) ~=~ log(1.5) + (x-1.5)/1.5 log10(x) = log(x) / log(10) ~=~
+       * log(1.5)/log(10) + (x-1.5)/(1.5*log(10)) log10(d) =
+       * (i-Bias)*log(2)/log(10) + log10(d2) This suggests computing an
+       * approximation k to log10(d) by k = (i - Bias)*0.301029995663981 + (
+       * (d2-1.5)*0.289529654602168 + 0.176091259055681 ); We want k to be too 
+       * large rather than too small. The error in the first-order Taylor
+       * series approximation is in our favor, so we just round up the constant 
+       * enough to compensate for any error in the multiplication of (i - Bias) 
+       * by 0.301029995663981; since |i - Bias| <= 1077, and 1077 * 0.30103 *
+       * 2^-52 ~=~ 7.2e-14, adding 1e-13 to the constant term more than
+       * suffices. Hence we adjust the constant term to 0.1760912590558. (We
+       * could get a more accurate k by invoking log10, but this is probably
+       * not worthwhile.) */
+
+      i -= Bias;
+      denorm = 0;
+    }
+  else
+    {
+      /* d is denormalized */
+
+      i = bbits + be + (Bias + (P - 1) - 1);
+      x = i > 32 ? word0(d) << (64 - i) | word1(d) >> (i - 32)
+        : word1(d) << (32 - i);
+      d2 = x;
+      word0(d2) -= 31 * Exp_msk1;       /* adjust exponent */
+      i -= (Bias + (P - 1) - 1) + 1;
+      denorm = 1;
+    }
+
+  ds = (d2 - 1.5) * 0.289529654602168 + 0.1760912590558 + i * 0.301029995663981;
+  k = (int)ds;
+  if (ds < 0. && ds != k)
+    {
+      k--;  /* want k = floor(ds) */
+    }
+  k_check = 1;
+
+  if (k >= 0 && k <= Ten_pmax)
+    {
+      if (d < tens[k])
+        k--;
+      k_check = 0;
+    }
+
+  j = bbits - i - 1;
+  if (j >= 0)
+    {
+      b2 = 0;
+      s2 = j;
+    }
+  else
+    {
+      b2 = -j;
+      s2 = 0;
+    }
+
+  if (k >= 0)
+    {
+      b5 = 0;
+      s5 = k;
+      s2 += k;
+    }
+  else
+    {
+      b2 -= k;
+      b5 = -k;
+      s5 = 0;
+    }
+
+  if (mode < 0 || mode > 9)
+    {
+      mode = 0;
+    }
+
+  try_quick = 1;
+  if (mode > 5)
+    {
+      mode -= 4;
+      try_quick = 0;
+    }
+
+  leftright = 1;
+  switch (mode)
+    {
+    case 0:
+    case 1:
+      ilim = ilim1 = -1;
+      i = 18;
+      ndigits = 0;
+      break;
+
+    case 2:
+      leftright = 0;
+      /* no break */
+    case 4:
+      if (ndigits <= 0)
+        {
+          ndigits = 1;
+        }
+
+      ilim = ilim1 = i = ndigits;
+      break;
+
+    case 3:
+      leftright = 0;
+      /* no break */
+    case 5:
+      i = ndigits + k + 1;
+      ilim = i;
+      ilim1 = i - 1;
+      if (i <= 0)
+        {
+          i = 1;
+        }
+    }
+
+  j = sizeof(unsigned long);
+  for (result_k = 0;
+       (signed)(sizeof(Bigint) - sizeof(unsigned long) + j) <= i;
+       j <<= 1)
+    {
+      result_k++;
+    }
+
+  result = Balloc(result_k);
+  s = s0 = (char *)result;
+
+  if (ilim >= 0 && ilim <= Quick_max && try_quick)
+    {
+      /* Try to get by with floating-point arithmetic. */
+
+      i = 0;
+      d2 = d;
+      k0 = k;
+      ilim0 = ilim;
+      ieps = 2;                 /* conservative */
+
+      if (k > 0)
+        {
+          ds = tens[k & 0xf];
+          j = k >> 4;
+
+          if (j & Bletch)
+            {
+              /* prevent overflows */
+              j &= Bletch - 1;
+              d /= bigtens[n_bigtens - 1];
+              ieps++;
+            }
+
+          for (; j; j >>= 1, i++)
+            {
+              if (j & 1)
+                {
+                  ieps++;
+                  ds *= bigtens[i];
+                }
+            }
+
+          d /= ds;
+        }
+      else if ((j_1 = -k))
+        {
+          d *= tens[j_1 & 0xf];
+          for (j = j_1 >> 4; j; j >>= 1, i++)
+            {
+              if (j & 1)
+                {
+                  ieps++;
+                  d *= bigtens[i];
+                }
+            }
+        }
+
+      if (k_check && d < 1. && ilim > 0)
+        {
+          if (ilim1 <= 0)
+            {
+              goto fast_failed;
+            }
+
+          ilim = ilim1;
+          k--;
+          d *= 10.;
+          ieps++;
+        }
+
+      eps = ieps * d + 7.;
+      word0(eps) -= (P - 1) * Exp_msk1;
+      if (ilim == 0)
+        {
+          S = mhi = 0;
+          d -= 5.;
+          if (d > eps)
+            goto one_digit;
+          if (d < -eps)
+            goto no_digits;
+          goto fast_failed;
+        }
+
+#ifndef No_leftright
+      if (leftright)
+        {
+          /* Use Steele & White method of only generating digits needed. */
+
+          eps = 0.5 / tens[ilim - 1] - eps;
+          for (i = 0;;)
+            {
+              L = (int)d;
+              d -= L;
+              *s++ = '0' + (int)L;
+              if (d < eps)
+                goto ret1;
+              if (1. - d < eps)
+                goto bump_up;
+              if (++i >= ilim)
+                break;
+              eps *= 10.;
+              d *= 10.;
+            }
+        }
+      else
+        {
+#endif
+          /* Generate ilim digits, then fix them up. */
+          
+          eps *= tens[ilim - 1];
+          for (i = 1;; i++, d *= 10.)
+            {
+              L = (int)d;
+              d -= L;
+              *s++ = '0' + (int)L;
+              if (i == ilim)
+                {
+                  if (d > 0.5 + eps)
+                    goto bump_up;
+                  else if (d < 0.5 - eps)
+                    {
+                      while (*--s == '0');
+                      s++;
+                      goto ret1;
+                    }
+                  break;
+                }
+            }
+#ifndef No_leftright
+        }
+#endif
+    fast_failed:
+      s = s0;
+      d = d2;
+      k = k0;
+      ilim = ilim0;
+    }
+
+  /* Do we have a "small" integer? */
+
+  if (be >= 0 && k <= Int_max)
+    {
+      /* Yes. */
+
+      ds = tens[k];
+      if (ndigits < 0 && ilim <= 0)
+        {
+          S = mhi = 0;
+          if (ilim < 0 || d <= 5 * ds)
+            goto no_digits;
+          goto one_digit;
+        }
+
+      for (i = 1;; i++)
+        {
+          L = (int)(d / ds);
+          d -= L * ds;
+#ifdef Check_FLT_ROUNDS
+          /* If FLT_ROUNDS == 2, L will usually be high by 1 */
+          if (d < 0)
+            {
+              L--;
+              d += ds;
+            }
+#endif
+          *s++ = '0' + (int)L;
+          if (i == ilim)
+            {
+              d += d;
+              if (d > ds || (d == ds && (L & 1)))
+                {
+                bump_up:
+                  while (*--s == '9')
+                    if (s == s0)
+                      {
+                        k++;
+                        *s = '0';
+                        break;
+                      }
+                  ++*s++;
+                }
+              break;
+            }
+          if (!(d *= 10.))
+            {
+              break;
+            }
+        }
+
+      goto ret1;
+    }
+
+  m2 = b2;
+  m5 = b5;
+  mhi = mlo = 0;
+  if (leftright)
+    {
+      if (mode < 2)
+        {
+          i = denorm ? be + (Bias + (P - 1) - 1 + 1) : 1 + P - bbits;
+        }
+      else
+        {
+          j = ilim - 1;
+          if (m5 >= j)
+            m5 -= j;
+          else
+            {
+              s5 += j -= m5;
+              b5 += j;
+              m5 = 0;
+            }
+          if ((i = ilim) < 0)
+            {
+              m2 -= i;
+              i = 0;
+            }
+        }
+
+      b2 += i;
+      s2 += i;
+      mhi = i2b(1);
+    }
+
+  if (m2 > 0 && s2 > 0)
+    {
+      i = m2 < s2 ? m2 : s2;
+      b2 -= i;
+      m2 -= i;
+      s2 -= i;
+    }
+
+  if (b5 > 0)
+    {
+      if (leftright)
+        {
+          if (m5 > 0)
+            {
+              mhi = pow5mult(mhi, m5);
+              b1 = mult(mhi, b);
+              Bfree(b);
+              b = b1;
+            }
+          if ((j = b5 - m5))
+            b = pow5mult(b, j);
+        }
+      else
+        {
+          b = pow5mult(b, b5);
+        }
+    }
+
+  S = i2b(1);
+  if (s5 > 0)
+    {
+      S = pow5mult(S, s5);
+    }
+
+  /* Check for special case that d is a normalized power of 2. */
+
+  if (mode < 2)
+    {
+      if (!word1(d) && !(word0(d) & Bndry_mask) && word0(d) & Exp_mask)
+        {
+          /* The special case */
+          b2 += Log2P;
+          s2 += Log2P;
+          spec_case = 1;
+        }
+      else
+        {
+          spec_case = 0;
+        }
+    }
+
+  /* Arrange for convenient computation of quotients: shift left if
+   * necessary so divisor has 4 leading 0 bits.
+   *
+   * Perhaps we should just compute leading 28 bits of S once and for all
+   * and pass them and a shift to quorem, so it can do shifts and ors
+   * to compute the numerator for q.
+   */
+
+#ifdef Pack_32
+  if ((i = ((s5 ? 32 - hi0bits(S->x[S->wds - 1]) : 1) + s2) & 0x1f))
+    {
+      i = 32 - i;
+    }
+#else
+  if ((i = ((s5 ? 32 - hi0bits(S->x[S->wds - 1]) : 1) + s2) & 0xf))
+    {
+      i = 16 - i;
+    }
+#endif
+
+  if (i > 4)
+    {
+      i -= 4;
+      b2 += i;
+      m2 += i;
+      s2 += i;
+    }
+  else if (i < 4)
+    {
+      i += 28;
+      b2 += i;
+      m2 += i;
+      s2 += i;
+    }
+
+  if (b2 > 0)
+    {
+      b = lshift(b, b2);
+    }
+
+  if (s2 > 0)
+    {
+      S = lshift(S, s2);
+    }
+
+  if (k_check)
+    {
+      if (cmp(b, S) < 0)
+        {
+          k--;
+          b = multadd(b, 10, 0);        /* we botched the k estimate */
+          if (leftright)
+            {
+              mhi = multadd(mhi, 10, 0);
+            }
+
+          ilim = ilim1;
+        }
+    }
+
+  if (ilim <= 0 && mode > 2)
+    {
+      if (ilim < 0 || cmp(b, S = multadd(S, 5, 0)) <= 0)
+        {
+          /* no digits, fcvt style */
+        no_digits:
+          k = -1 - ndigits;
+          goto ret;
+        }
+    one_digit:
+      *s++ = '1';
+      k++;
+      goto ret;
+    }
+
+  if (leftright)
+    {
+      if (m2 > 0)
+        {
+          mhi = lshift(mhi, m2);
+        }
+
+      /* Compute mlo -- check for special case that d is a normalized power of
+       * 2. */
+
+      mlo = mhi;
+      if (spec_case)
+        {
+          mhi = Balloc(mhi->k);
+          Bcopy(mhi, mlo);
+          mhi = lshift(mhi, Log2P);
+        }
+
+      for (i = 1;; i++)
+        {
+          dig = quorem(b, S) + '0';
+          /* Do we yet have the shortest decimal string that will round to d? */
+          j = cmp(b, mlo);
+          delta = diff(S, mhi);
+          j_1 = delta->sign ? 1 : cmp(b, delta);
+          Bfree(delta);
+#ifndef ROUND_BIASED
+          if (j_1 == 0 && !mode && !(word1(d) & 1))
+            {
+              if (dig == '9')
+                {
+                 goto round_9_up;
+                }
+
+              if (j > 0)
+                {
+                  dig++;
+                }
+
+              *s++ = dig;
+              goto ret;
+            }
+#endif
+          if (j < 0 || (j == 0 && !mode
+#ifndef ROUND_BIASED
+                        && (!(word1(d) & 1))
+#endif
+            ))
+            {
+              if ((j_1 > 0))
+                {
+                  b = lshift(b, 1);
+                  j_1 = cmp(b, S);
+                  if ((j_1 > 0 || (j_1 == 0 && (dig & 1))) && dig++ == '9')
+                    {
+                      goto round_9_up;
+                    }
+                }
+
+              *s++ = dig;
+              goto ret;
+            }
+
+          if (j_1 > 0)
+            {
+              if (dig == '9')
+                {               /* possible if i == 1 */
+                round_9_up:
+                  *s++ = '9';
+                  goto roundoff;
+                }
+
+              *s++ = dig + 1;
+              goto ret;
+            }
+
+          *s++ = dig;
+          if (i == ilim)
+            {
+              break;
+            }
+
+          b = multadd(b, 10, 0);
+          if (mlo == mhi)
+            {
+              mlo = mhi = multadd(mhi, 10, 0);
+            }
+          else
+            {
+              mlo = multadd(mlo, 10, 0);
+              mhi = multadd(mhi, 10, 0);
+            }
+        }
+    }
+  else
+    {
+      for (i = 1;; i++)
+        {
+          *s++ = dig = quorem(b, S) + '0';
+          if (i >= ilim)
+            {
+              break;
+            }
+
+          b = multadd(b, 10, 0);
+        }
+    }
+
+  /* Round off last digit */
+
+  b = lshift(b, 1);
+  j = cmp(b, S);
+  if (j > 0 || (j == 0 && (dig & 1)))
+    {
+    roundoff:
+      while (*--s == '9')
+        if (s == s0)
+          {
+            k++;
+            *s++ = '1';
+            goto ret;
+          }
+      ++*s++;
+    }
+  else
+    {
+      while (*--s == '0');
+      s++;
+    }
+
+ret:
+  Bfree(S);
+  if (mhi)
+    {
+      if (mlo && mlo != mhi)
+        {
+          Bfree(mlo);
+        }
+
+      Bfree(mhi);
+    }
+ret1:
+  Bfree(b);
+  if (s == s0)
+    {                           /* don't return empty string */
+      *s++ = '0';
+      k = 0;
+    }
+
+  *s = 0;
+  *decpt = k + 1;
+  if (rve)
+    {
+      *rve = s;
+    }
+
+  return s0;
+}
diff --git a/nuttx/lib/stdio/lib_fclose.c b/nuttx/lib/stdio/lib_fclose.c
new file mode 100644
index 000000000..8cecb8af3
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fclose.c
@@ -0,0 +1,154 @@
+/****************************************************************************
+ * lib/stdio/lib_fclose.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fclose
+ *
+ * Description
+ *   The fclose() function will flush the stream pointed to by stream
+ *   (writing any buffered output data using lib_fflush()) and close the
+ *   underlying file descriptor.
+ *
+ * Returned Value:
+ *   Upon successful completion 0 is returned. Otherwise, EOF is returned
+ *   and the global variable errno is set to indicate the error. In either
+ *   case any further access (including another call to fclose()) to the
+ *   stream results in undefined behaviour.
+ *
+ ****************************************************************************/
+
+int fclose(FAR FILE *stream)
+{
+  int err = EINVAL;
+  int ret = ERROR;
+  int status;
+
+  /* Verify that a stream was provided. */
+
+  if (stream)
+    {
+      /* Check that the underlying file descriptor corresponds to an an open
+       * file.
+       */
+ 
+      ret = OK;
+      if (stream->fs_filedes >= 0)
+        {
+          /* If the stream was opened for writing, then flush the stream */
+
+          if ((stream->fs_oflags & O_WROK) != 0)
+            {
+              ret = lib_fflush(stream, true);
+              err = errno;
+            }
+
+          /* Close the underlying file descriptor and save the return status */
+
+          status = close(stream->fs_filedes);
+
+          /* If close() returns an error but flush() did not then make sure
+           * that we return the close() error condition.
+           */
+
+          if (ret == OK)
+            {
+              ret = status;
+              err = errno;
+            }
+        }
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+      /* Destroy the semaphore */
+
+      sem_destroy(&stream->fs_sem);
+
+      /* Release the buffer */
+
+      if (stream->fs_bufstart)
+        {
+          lib_free(stream->fs_bufstart);
+        }
+
+      /* Clear the whole structure */
+
+      memset(stream, 0, sizeof(FILE));
+#else
+#if CONFIG_NUNGET_CHARS > 0
+      /* Reset the number of ungetc characters */
+
+      stream->fs_nungotten = 0;
+#endif
+      /* Reset the flags */
+
+      stream->fs_oflags = 0;
+#endif
+      /* Setting the fs_filedescriptor to -1 makes the stream available for reuse */
+
+      stream->fs_filedes = -1;
+    }
+
+  /* On an error, reset the errno to the first error encountered and return
+   * EOF.
+   */
+
+  if (ret != OK)
+    {
+      set_errno(err);
+      return EOF;
+    }
+
+  /* Return success */
+
+  return OK;
+}
+
diff --git a/nuttx/lib/stdio/lib_feof.c b/nuttx/lib/stdio/lib_feof.c
new file mode 100644
index 000000000..e44c6a3c9
--- /dev/null
+++ b/nuttx/lib/stdio/lib_feof.c
@@ -0,0 +1,77 @@
+/****************************************************************************
+ * lib/stdio/lib_feof.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#if CONFIG_NFILE_STREAMS > 0
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: feof
+ *
+ * Description:
+ *   The feof() function shall test if the currently file pointer for the
+ *   stream is at the end of file.
+ *
+ * Returned Value:
+ *  This function will return non-zero if the the file pointer is positioned
+ *  at the end of file.
+ *
+ ****************************************************************************/
+
+int feof(FILE *stream)
+{
+  /* If the end-of-file condition is encountered by any of the C-buffered
+   * I/O functions that perform read operations, they should set the
+   * __FS_FLAG_EOF in the fs_flags field of struct file_struct.
+   */
+
+  return (stream->fs_flags & __FS_FLAG_EOF) != 0;
+}
+
+#endif /* CONFIG_NFILE_STREAMS */
+
diff --git a/nuttx/lib/stdio/lib_ferror.c b/nuttx/lib/stdio/lib_ferror.c
new file mode 100644
index 000000000..4ad7d8cfc
--- /dev/null
+++ b/nuttx/lib/stdio/lib_ferror.c
@@ -0,0 +1,90 @@
+/****************************************************************************
+ * lib/stdio/lib_ferror.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#if CONFIG_NFILE_STREAMS > 0
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ferror
+ *
+ * Description:
+ *   This function will test if the last operation resulted in an eror.  This
+ *   is used to disambiguate EOF and error conditions.
+ *
+ * Return Value:
+ *   A non-zero value is returned to indicate the error condition.
+ *
+ ****************************************************************************/
+
+int ferror(FILE *stream)
+{
+#if 0
+  /* If an error is encountered by any of the C-buffered I/O functions, they
+   * should set the __FS_FLAG_ERROR in the fs_flags field of struct
+   * file_struct.
+   */
+
+  return (stream->fs_flags & __FS_FLAG_ERROR) != 0;
+#else
+  /* However, nothing currenlty sets the __FS_FLAG_ERROR flag (that is a job
+   * for another day).  The __FS_FLAG_EOF is set by operations that perform
+   * read operations.  Since ferror()  is probably only called to disambiguate
+   * the meaning of other functions that return EOF, to indicate either EOF or
+   * an error, just testing for not EOF is probably sufficient for now.
+   *
+   * This approach would not work if ferror() is called in other contexts. In
+   * those cases, ferror() will always report an error.
+   */
+
+  return (stream->fs_flags & __FS_FLAG_EOF) == 0;
+#endif
+}
+
+#endif /* CONFIG_NFILE_STREAMS */
+
diff --git a/nuttx/lib/stdio/lib_fflush.c b/nuttx/lib/stdio/lib_fflush.c
new file mode 100644
index 000000000..d0b5e0185
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fflush.c
@@ -0,0 +1,132 @@
+/****************************************************************************
+ * lib/stdio/lib_fflush.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fflush
+ *
+ * Description:
+ *  The function fflush() forces a write of all user-space buffered data for
+ *  the given output or update stream via the stream's underlying write
+ *  function.  The open status of the stream is unaffected.
+ *
+ *  If the stream argument is NULL, fflush() flushes all open output streams.
+ *
+ * Return:
+ *  OK on success EOF on failure (with errno set appropriately)
+ *
+ ****************************************************************************/
+
+int fflush(FAR FILE *stream)
+{
+  int ret;
+
+  /* Is the stream argument NULL? */
+
+  if (!stream)
+    {
+      /* Yes... then this is a request to flush all streams */
+
+      ret = lib_flushall(sched_getstreams());
+    }
+  else
+    {
+      ret = lib_fflush(stream, true);
+    }
+
+  /* Check the return value */
+
+  if (ret < 0)
+    {
+      /* An error occurred during the flush AND/OR we were unable to flush
+       * all of the buffered write data. Set the errno value.
+       */
+
+      set_errno(-ret);
+
+      /* And return EOF on failure. */
+
+      return EOF;
+    }
+
+  return OK;
+}
+
diff --git a/nuttx/lib/stdio/lib_fgetc.c b/nuttx/lib/stdio/lib_fgetc.c
new file mode 100644
index 000000000..4b3d0ec44
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fgetc.c
@@ -0,0 +1,101 @@
+/****************************************************************************
+ * lib/stdio/lib_fgetc.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/**************************************************************************
+ * Global Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/**************************************************************************
+ * Private Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ **************************************************************************/
+
+/****************************************************************************
+ * fgetc
+ **************************************************************************/
+
+int fgetc(FAR FILE *stream)
+{
+  unsigned char ch;
+  ssize_t ret;
+
+  ret = lib_fread(&ch, 1, stream);
+  if (ret > 0)
+    {
+      return ch;
+    }
+  else
+    {
+      return EOF;
+    }
+}
diff --git a/nuttx/lib/stdio/lib_fgetpos.c b/nuttx/lib/stdio/lib_fgetpos.c
new file mode 100644
index 000000000..e9e9f4d10
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fgetpos.c
@@ -0,0 +1,123 @@
+/****************************************************************************
+ * lib/stdio/lib_fgetpos.c
+ *
+ *   Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fgetpos
+ *
+ * Description:
+ *   fgetpos() function is an alternate interfaces equivalent to ftell().
+ *   It gets the current value of the file offset and store it in the location
+ *   referenced by pos.  On some non-UNIX systems an fpos_t object may be a
+ *   complex object and fsetpos may be the only way to portably reposition a
+ *   stream.
+ *
+ * Returned Value:
+ *   Zero on succes; -1 on failure with errno set appropriately. 
+ *
+ ****************************************************************************/
+
+int fgetpos(FAR FILE *stream, FAR fpos_t *pos)
+{
+  long position;
+
+#if CONFIG_DEBUG
+  if (!stream || !pos)
+    {
+      set_errno(EINVAL);
+      return ERROR;
+    }
+#endif
+
+  position = ftell(stream);
+  if (position == -1)
+    {
+      return ERROR;
+    }
+
+  *pos = (fpos_t)position;
+  return OK;
+}
diff --git a/nuttx/lib/stdio/lib_fgets.c b/nuttx/lib/stdio/lib_fgets.c
new file mode 100644
index 000000000..a4f9089ed
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fgets.c
@@ -0,0 +1,207 @@
+/****************************************************************************
+ * lib/stdio/lib_fgets.c
+ *
+ *   Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include <debug.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+/* Some environments may return CR as end-of-line, others LF, and others
+ * both.  If not specified, the logic here assumes either (but not both) as
+ * the default.
+ */
+
+#if defined(CONFIG_EOL_IS_CR)
+#  undef  CONFIG_EOL_IS_LF
+#  undef  CONFIG_EOL_IS_BOTH_CRLF
+#  undef  CONFIG_EOL_IS_EITHER_CRLF
+#elif defined(CONFIG_EOL_IS_LF)
+#  undef  CONFIG_EOL_IS_CR
+#  undef  CONFIG_EOL_IS_BOTH_CRLF
+#  undef  CONFIG_EOL_IS_EITHER_CRLF
+#elif defined(CONFIG_EOL_IS_BOTH_CRLF)
+#  undef  CONFIG_EOL_IS_CR
+#  undef  CONFIG_EOL_IS_LF
+#  undef  CONFIG_EOL_IS_EITHER_CRLF
+#elif defined(CONFIG_EOL_IS_EITHER_CRLF)
+#  undef  CONFIG_EOL_IS_CR
+#  undef  CONFIG_EOL_IS_LF
+#  undef  CONFIG_EOL_IS_BOTH_CRLF
+#else
+#  undef  CONFIG_EOL_IS_CR
+#  undef  CONFIG_EOL_IS_LF
+#  undef  CONFIG_EOL_IS_BOTH_CRLF
+#  define CONFIG_EOL_IS_EITHER_CRLF 1
+#endif
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fgets
+ *
+ * Description:
+ *   fgets() reads in at most one less than 'buflen' characters from stream
+ *   and stores them into the buffer pointed to by 'buf'. Reading stops after
+ *   an EOF or a newline.  If a newline is read, it is stored into the
+ *   buffer.  A null terminator is stored after the last character in the
+ *   buffer.
+ *
+ **************************************************************************/
+
+char *fgets(FAR char *buf, int buflen, FILE *stream)
+{
+  int  nch = 0;
+
+  /* Sanity checks */
+
+  if (!stream || !buf || buflen < 1 || stream->fs_filedes < 0)
+    {
+      return NULL;
+    }
+
+  if (buflen < 2)
+    {
+      *buf = '\0';
+      return buf;
+    }
+
+  /* Read characters until we have a full line. On each the loop we must
+   * be assured that there are two free bytes in the line buffer:  One for
+   * the next character and one for the null terminator.
+   */
+
+  for(;;)
+    {
+      /* Get the next character */
+
+      int ch = fgetc(stream);
+
+      /* Check for end-of-line.  This is tricky only in that some
+       * environments may return CR as end-of-line, others LF, and
+       * others both.
+       */
+
+#if  defined(CONFIG_EOL_IS_LF) || defined(CONFIG_EOL_IS_BOTH_CRLF)
+      if (ch == '\n')
+#elif defined(CONFIG_EOL_IS_CR)
+      if (ch == '\r')
+#elif CONFIG_EOL_IS_EITHER_CRLF
+      if (ch == '\n' || ch == '\r')
+#endif
+        {
+          /* The newline is stored in the buffer along with the null
+           * terminator.
+           */
+
+          buf[nch++] = '\n';
+          buf[nch]   = '\0';
+          return buf;
+        }
+
+      /* Check for end-of-file */
+
+      else if (ch == EOF)
+        {
+          /* End of file with no data? */
+
+          if (!nch)
+            {
+              /* Yes.. return NULL as the end of file mark */
+
+              return NULL;
+            }
+          else
+            {
+              /* Terminate the line */
+
+              buf[nch]   = '\0';
+              return buf;
+            }
+        }
+
+      /* Otherwise, check if the character is printable and, if so, put the
+       * character in the line buffer
+       */
+
+      else if (isprint(ch))
+        {
+          buf[nch++] = ch;
+
+          /* Check if there is room for another character and the line's
+           * null terminator.  If not then we have to end the line now.
+           */
+
+          if (nch + 1 >= buflen)
+            {
+              buf[nch] = '\0';
+              return buf;
+            }
+        }
+    }
+}
+
diff --git a/nuttx/lib/stdio/lib_fileno.c b/nuttx/lib/stdio/lib_fileno.c
new file mode 100644
index 000000000..fca08fc0d
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fileno.c
@@ -0,0 +1,70 @@
+/****************************************************************************
+ * lib/stdio/lib_fileno.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#if CONFIG_NFILE_STREAMS > 0
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+int fileno(FAR FILE *stream)
+{
+  int ret = -1;
+  if (stream)
+    {
+      ret = stream->fs_filedes;
+    }
+
+  if (ret < 0)
+    {
+      set_errno(EBADF);
+      return ERROR;
+    }
+
+  return ret;
+}
+#endif /* CONFIG_NFILE_STREAMS */
+
diff --git a/nuttx/lib/stdio/lib_fopen.c b/nuttx/lib/stdio/lib_fopen.c
new file mode 100644
index 000000000..29ff4569c
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fopen.c
@@ -0,0 +1,299 @@
+/****************************************************************************
+ * lib/stdio/lib_fopen.c
+ *
+ *   Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+enum open_mode_e
+{
+  MODE_NONE = 0, /* No access mode determined */
+  MODE_R,        /* "r" or "rb" open for reading */
+  MODE_W,        /* "w" or "wb" open for writing, truncating or creating file */
+  MODE_A,        /* "a" or "ab" open for writing, appending to file */
+  MODE_RPLUS,    /* "r+", "rb+", or "r+b" open for update (reading and writing) */
+  MODE_WPLUS,    /* "w+", "wb+", or "w+b"  open for update, truncating or creating file */
+  MODE_APLUS     /* "a+", "ab+", or "a+b" open for update, appending to file */
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_mode2oflags
+ ****************************************************************************/
+
+static int lib_mode2oflags(FAR const char *mode)
+{
+  enum open_mode_e state;
+  int oflags;
+
+  /* Verify that a mode string was provided.  No error is  */
+
+  if (!mode)
+    {
+      goto errout;
+    }
+
+  /* Parse the mode string to determine the corresponding open flags */
+
+  state  = MODE_NONE;
+  oflags = 0;
+
+  for (; *mode; mode++)
+    {
+      switch (*mode)
+        {
+          /* Open for read access ("r", "r[+]", "r[b]",  "r[b+]", or "r[+b]") */
+
+          case 'r' :
+            if (state == MODE_NONE)
+              {
+                /* Open for read access */
+
+                oflags = O_RDOK;
+                state  = MODE_R;
+              }
+            else
+              {
+                goto errout;
+              }
+            break;
+
+          /* Open for write access ("w", "w[+]", "w[b]",  "w[b+]", or "w[+b]") */
+
+          case 'w' :
+            if (state == MODE_NONE)
+              {
+                /* Open for write access, truncating any existing file */
+
+                oflags = O_WROK|O_CREAT|O_TRUNC;
+                state  = MODE_W;
+              }
+            else
+              {
+                goto errout;
+              }
+            break;
+
+          /* Open for write/append access ("a", "a[+]", "a[b]", "a[b+]", or "a[+b]") */
+
+          case 'a' :
+            if (state == MODE_NONE)
+              {
+                /* Write to the end of the file */
+
+                oflags = O_WROK|O_CREAT|O_APPEND;
+                state  = MODE_A;
+              }
+            else
+              {
+                goto errout;
+              }
+            break;
+
+          /* Open for update access ("[r]+", "[rb]+]", "[r]+[b]", "[w]+",
+           * "[wb]+]", "[w]+[b]", "[a]+", "[ab]+]",  "[a]+[b]")
+           */
+
+          case '+' :
+            switch (state)
+              {
+                case MODE_R:
+                  {
+                    /* Retain any binary mode selection */
+
+                    oflags &= O_BINARY;
+
+                    /* Open for read/write access */
+
+                    oflags |= O_RDWR;
+                    state   = MODE_RPLUS;
+                 }
+                 break;
+
+                case MODE_W:
+                  {
+                    /* Retain any binary mode selection */
+
+                    oflags &= O_BINARY;
+
+                    /* Open for write read/access, truncating any existing file */
+
+                    oflags |= O_RDWR|O_CREAT|O_TRUNC;
+                    state   = MODE_WPLUS;
+                  }
+                  break;
+
+                case MODE_A:
+                  {
+                    /* Retain any binary mode selection */
+
+                    oflags &= O_BINARY;
+
+                    /* Read from the beginning of the file; write to the end */
+
+                    oflags |= O_RDWR|O_CREAT|O_APPEND;
+                    state   = MODE_APLUS;
+                  }
+                  break;
+
+                default:
+                  goto errout;
+                  break;
+              }
+            break;
+
+          /* Open for binary access ("[r]b", "[r]b[+]", "[r+]b", "[w]b",
+           * "[w]b[+]", "[w+]b", "[a]b", "[a]b[+]",  "[a+]b")
+           */
+
+          case 'b' :
+            if (state != MODE_NONE)
+              {
+                /* The file is opened in binary mode */
+
+                oflags |= O_BINARY;
+              }
+            else
+              {
+                goto errout;
+              }
+            break;
+
+          /* Unrecognized or unsupported mode */
+
+          default:
+            goto errout;
+            break;
+        }
+    }
+
+  return oflags;
+
+/* Both fopen and fdopen should fail with errno == EINVAL if the mode
+ * string is invalid.
+ */
+
+errout:
+  set_errno(EINVAL);
+  return ERROR;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fdopen
+ ****************************************************************************/
+
+FAR FILE *fdopen(int fd, FAR const char *mode)
+{
+  FAR FILE *ret = NULL;
+  int oflags;
+
+  /* Map the open mode string to open flags */
+
+  oflags = lib_mode2oflags(mode);
+  if (oflags >= 0)
+    {
+      ret = fs_fdopen(fd, oflags, NULL);
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: fopen
+ ****************************************************************************/
+
+FAR FILE *fopen(FAR const char *path, FAR const char *mode)
+{
+  FAR FILE *ret = NULL;
+  int oflags;
+  int fd;
+
+  /* Map the open mode string to open flags */
+
+  oflags = lib_mode2oflags(mode);
+  if (oflags < 0)
+    {
+      return NULL;
+    }
+
+  /* Open the file */
+
+  fd = open(path, oflags, 0666);
+
+  /* If the open was successful, then fdopen() the fil using the file
+   * desciptor returned by open.  If open failed, then just return the
+   * NULL stream -- open() has already set the errno.
+   */
+
+  if (fd >= 0)
+    {
+      ret = fs_fdopen(fd, oflags, NULL);
+      if (!ret)
+        {
+          /* Don't forget to close the file descriptor if any other
+           * failures are reported by fdopen().
+           */
+
+          (void)close(fd);
+        }
+    }
+  return ret;
+}
diff --git a/nuttx/lib/stdio/lib_fprintf.c b/nuttx/lib/stdio/lib_fprintf.c
new file mode 100644
index 000000000..a803de4bd
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fprintf.c
@@ -0,0 +1,93 @@
+/****************************************************************************
+ * lib/stdio/lib_fprintf.c
+ *
+ *   Copyright (C) 2007, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fprintf
+ ****************************************************************************/
+
+int fprintf(FAR FILE *stream, FAR const char *fmt, ...)
+{
+  va_list ap;
+  int     n;
+
+  /* vfprintf into the stream */
+
+  va_start(ap, fmt);
+  n = vfprintf(stream, fmt, ap);
+  va_end(ap);
+  return n;
+}
diff --git a/nuttx/lib/stdio/lib_fputc.c b/nuttx/lib/stdio/lib_fputc.c
new file mode 100644
index 000000000..121161f10
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fputc.c
@@ -0,0 +1,113 @@
+/****************************************************************************
+ * lib/stdio/lib_fputc.c
+ *
+ *   Copyright (C) 2007, 2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fputc
+ ****************************************************************************/
+
+int fputc(int c, FAR FILE *stream)
+{
+  unsigned char buf = (unsigned char)c;
+  int ret;
+
+  ret = lib_fwrite(&buf, 1, stream);
+  if (ret > 0)
+    {
+      /* Flush the buffer if a newline is output */
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+      if (c == '\n')
+        {
+          ret = lib_fflush(stream, true);
+          if (ret < 0)
+            {
+              return EOF;
+            }
+        }
+#endif
+      return c;
+    }
+  else
+    {
+      return EOF;
+    }
+}
diff --git a/nuttx/lib/stdio/lib_fputs.c b/nuttx/lib/stdio/lib_fputs.c
new file mode 100644
index 000000000..2d6217d4a
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fputs.c
@@ -0,0 +1,220 @@
+/****************************************************************************
+ * lib/stdio/lib_fputs.c
+ *
+ *   Copyright (C) 2007, 2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fputs
+ *
+ * Description:
+ *   fputs() writes the string s to stream, without its trailing '\0'.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_ARCH_ROMGETC)
+int fputs(FAR const char *s, FAR FILE *stream)
+{
+  int nput;
+  int ret;
+  char ch;
+
+  /* Make sure that a string was provided. */
+
+#ifdef CONFIG_DEBUG /* Most parameter checking is disabled if DEBUG is off */
+  if (!s)
+    {
+      set_errno(EINVAL);
+      return EOF;
+    }
+#endif
+
+  /* Write the string.  Loop until the null terminator is encountered */
+
+  for (nput = 0, ch = up_romgetc(s); ch; nput++, s++, ch = up_romgetc(s))
+    {
+      /* Write the next character to the stream buffer */
+
+      ret = lib_fwrite(&ch, 1, stream);
+      if (ret <= 0)
+        {
+          return EOF;
+        }
+
+      /* Flush the buffer if a newline was written to the buffer */
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+      if (ch == '\n')
+        {
+          ret = lib_fflush(stream, true);
+          if (ret < 0)
+            {
+              return EOF;
+            }
+        }
+#endif
+    }
+
+  return nput;
+}
+
+#elif defined(CONFIG_STDIO_LINEBUFFER)
+int fputs(FAR const char *s, FAR FILE *stream)
+{
+  int nput;
+  int ret;
+
+  /* Make sure that a string was provided. */
+
+#ifdef CONFIG_DEBUG /* Most parameter checking is disabled if DEBUG is off */
+  if (!s)
+    {
+      set_errno(EINVAL);
+      return EOF;
+    }
+#endif
+
+  /* Write the string.  Loop until the null terminator is encountered */
+
+  for (nput = 0; *s; nput++, s++)
+    {
+      /* Write the next character to the stream buffer */
+
+      ret = lib_fwrite(s, 1, stream);
+      if (ret <= 0)
+        {
+          return EOF;
+        }
+
+      /* Flush the buffer if a newline was written to the buffer */
+
+      if (*s == '\n')
+        {
+          ret = lib_fflush(stream, true);
+          if (ret < 0)
+            {
+              return EOF;
+            }
+        }
+    }
+
+  return nput;
+}
+
+#else
+int fputs(FAR const char *s, FAR FILE *stream)
+{
+  int ntowrite;
+  int nput;
+
+  /* Make sure that a string was provided. */
+
+#ifdef CONFIG_DEBUG /* Most parameter checking is disabled if DEBUG is off */
+  if (!s)
+    {
+      set_errno(EINVAL);
+      return EOF;
+    }
+#endif
+
+  /* Get the length of the string. */
+
+  ntowrite = strlen(s);
+  if (ntowrite == 0)
+    {
+      return 0;
+    }
+
+  /* Write the string */
+
+  nput = lib_fwrite(s, ntowrite, stream);
+  if (nput < 0)
+    {
+      return EOF;
+    }
+  return nput;
+}
+#endif
diff --git a/nuttx/lib/stdio/lib_fread.c b/nuttx/lib/stdio/lib_fread.c
new file mode 100644
index 000000000..4a4b29256
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fread.c
@@ -0,0 +1,101 @@
+/****************************************************************************
+ * lib/stdio/lib_fread.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fread
+ ****************************************************************************/
+
+size_t fread(FAR void *ptr, size_t size, size_t n_items, FAR FILE *stream)
+{
+  size_t  full_size = n_items * (size_t)size;
+  ssize_t bytes_read;
+  size_t  items_read = 0;
+
+  /* Write the data into the stream buffer */
+
+  bytes_read = lib_fread(ptr, full_size, stream);
+  if (bytes_read > 0)
+    {
+      /* Return the number of full items read */
+
+      items_read = bytes_read / size;
+    }
+  return items_read;
+}
+
+
diff --git a/nuttx/lib/stdio/lib_fseek.c b/nuttx/lib/stdio/lib_fseek.c
new file mode 100644
index 000000000..7380f83b3
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fseek.c
@@ -0,0 +1,138 @@
+/****************************************************************************
+ * lib/stdio/lib_fseek.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fseek
+ *
+ * Description:
+ *   The fseek() function sets the file position indicator for the stream
+ *   pointed to by stream. The new position, measured in bytes, is obtained
+ *   by adding offset bytes to the position specified by whence. If whence is
+ *   set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is relative to the
+ *   start of the file, the current position indicator, or end-of-file,
+ *   respectively. A successful call to the fseek() function clears the
+ *   end-of-file indicator for the stream and undoes any effects of the ungetc(3)
+ *   function on the same stream.
+ *
+ * Returned Value:
+ *   Zero on succes; -1 on failure with errno set appropriately. 
+ *
+ ****************************************************************************/
+
+int fseek(FAR FILE *stream, long int offset, int whence)
+{
+ #if CONFIG_STDIO_BUFFER_SIZE > 0
+  /* Flush any valid read/write data in the buffer (also verifies stream) */
+
+  if (lib_rdflush(stream) < 0 || lib_wrflush(stream) < 0)
+    {
+      return ERROR;
+    }
+#else
+  /* Verify that we were provided with a stream */
+
+  if (!stream)
+    {
+      set_errno(EBADF);
+      return ERROR;
+    }
+#endif
+
+  /* On success or failure, discard any characters saved by ungetc() */
+
+#if CONFIG_NUNGET_CHARS > 0
+  stream->fs_nungotten = 0;
+#endif
+
+  /* Perform the fseek on the underlying file descriptor */
+
+  return lseek(stream->fs_filedes, offset, whence) == (off_t)-1 ? ERROR : OK;
+}
+
+
diff --git a/nuttx/lib/stdio/lib_fsetpos.c b/nuttx/lib/stdio/lib_fsetpos.c
new file mode 100644
index 000000000..13d556521
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fsetpos.c
@@ -0,0 +1,116 @@
+/****************************************************************************
+ * lib/stdio/lib_fsetpos.c
+ *
+ *   Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fsetpos
+ *
+ * Description:
+ *   fsetpos() function is an alternate interfaces equivalent to fseek()
+ *   (with whence set to  SEEK_SET).  It sets the current value of the file
+ *   offset to value in the location referenced by pos.  On some non-UNIX
+ *   systems an fpos_t object may be a complex object and fsetpos may be the
+ *   only way to portably reposition a stream.
+ *
+ * Returned Value:
+ *   Zero on succes; -1 on failure with errno set appropriately. 
+ *
+ ****************************************************************************/
+
+int fsetpos(FAR FILE *stream, FAR fpos_t *pos)
+{
+#if CONFIG_DEBUG
+  if (!stream || !pos)
+    {
+      set_errno(EINVAL);
+      return ERROR;
+    }
+#endif
+
+  return fseek(stream, (FAR off_t)*pos, SEEK_SET);
+}
diff --git a/nuttx/lib/stdio/lib_ftell.c b/nuttx/lib/stdio/lib_ftell.c
new file mode 100644
index 000000000..947648152
--- /dev/null
+++ b/nuttx/lib/stdio/lib_ftell.c
@@ -0,0 +1,129 @@
+/****************************************************************************
+ * lib/stdio/lib_ftell.c
+ *
+ *   Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ftell
+ *
+ * Description:
+ *   ftell() returns the current value of the file position indicator for the
+ *   stream pointed to by stream.
+ *
+ * Returned Value:
+ *   Zero on succes; -1 on failure with errno set appropriately. 
+ *
+ ****************************************************************************/
+
+long ftell(FAR FILE *stream)
+{
+  off_t position;
+
+  /* Verify that we were provided with a stream */
+
+  if (!stream)
+    {
+      set_errno(EBADF);
+      return ERROR;
+    }
+
+  /* Perform the lseek to the current position.  This will not move the
+   * file pointer, but will return its current setting
+   */
+
+  position = lseek(stream->fs_filedes, 0, SEEK_CUR);
+  if (position != (off_t)-1)
+    {
+      return (long)position;
+    }
+  else
+    {
+      return ERROR;
+    }
+}
+
+
diff --git a/nuttx/lib/stdio/lib_fwrite.c b/nuttx/lib/stdio/lib_fwrite.c
new file mode 100644
index 000000000..60e001746
--- /dev/null
+++ b/nuttx/lib/stdio/lib_fwrite.c
@@ -0,0 +1,99 @@
+/****************************************************************************
+ * lib/stdio/lib_fwrite.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fwrite
+ ****************************************************************************/
+
+size_t fwrite(FAR const void *ptr, size_t size, size_t n_items, FAR FILE *stream)
+{
+  size_t  full_size = n_items * (size_t)size;
+  ssize_t bytes_written;
+  size_t  items_written = 0;
+
+  /* Write the data into the stream buffer */
+
+  bytes_written = lib_fwrite(ptr, full_size, stream);
+  if (bytes_written > 0)
+    {
+      /* Return the number of full items written */
+
+      items_written = bytes_written / size;
+    }
+  return items_written;
+}
diff --git a/nuttx/lib/stdio/lib_gets.c b/nuttx/lib/stdio/lib_gets.c
new file mode 100644
index 000000000..95a6b36eb
--- /dev/null
+++ b/nuttx/lib/stdio/lib_gets.c
@@ -0,0 +1,120 @@
+/****************************************************************************
+ * lib/stdio/lib_gets.c
+ *
+ *   Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <limits.h>
+#include <string.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: gets
+ *
+ * Description:
+ *   gets() reads a line from stdin into the buffer pointed to by s until
+ *   either a terminating newline or EOF, which it replaces with '\0'.  No
+ *   check for buffer overrun is performed
+ *
+ *   This API should not be used because it is inherently unsafe.  Consider
+ *   using fgets which is safer and slightly more efficient.
+ *
+ **************************************************************************/
+
+FAR char *gets(FAR char *s)
+{
+  /* gets is ALMOST the same as fgets using stdin and no length limit
+   * (hence, the unsafeness of gets).  So let fgets do most of the work.
+   */
+
+  FAR char *ret = fgets(s, INT_MAX, stdin);
+  if (ret)
+    {
+      /* Another subtle difference from fgets is that gets replaces
+       * end-of-line markers with null terminators. We will do that as
+       * a second step (with some loss in performance).
+       */
+
+      int len = strlen(ret);
+      if (len > 0 && ret[len-1] == '\n')
+        {
+           ret[len-1] = '\0';
+        }
+    }
+
+  return ret;
+}
+
diff --git a/nuttx/lib/stdio/lib_libdtoa.c b/nuttx/lib/stdio/lib_libdtoa.c
new file mode 100644
index 000000000..667c49c53
--- /dev/null
+++ b/nuttx/lib/stdio/lib_libdtoa.c
@@ -0,0 +1,304 @@
+/****************************************************************************
+ * lib/unistd/lib_libdtoa.c
+ *
+ * This file was ported to NuttX by Yolande Cates.
+ *
+ * Copyright (c) 1990, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define MAX_PREC 16
+
+#ifndef MIN
+#  define MIN(a,b) (a < b ? a : b)
+#endif
+
+#ifndef MAX
+#  define MAX(a,b) (a > b ? a : b)
+#endif
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: zeroes
+ *
+ * Description:
+ *   Print the specified number of zeres
+ *
+ ****************************************************************************/
+
+static void zeroes(FAR struct lib_outstream_s *obj, int nzeroes)
+{
+  int i;
+
+  for (i = nzeroes; i > 0; i--)
+    {
+      obj->put(obj, '0');
+    }
+}
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_dtoa
+ *
+ * Description:
+ *   This is part of lib_vsprintf().  It handles the floating point formats.
+ *   This version supports only the %f (with precision).  If no precision
+ *   was provided in the format, this will use precision == 0 which is
+ *   probably not what you want.
+ *
+ * Input Parameters:
+ *   obj   - The output stream object
+ *   fmt   - The format character.  Not used 'f' is always assumed
+ *   prec  - The number of digits to the right of the decimal point. If no
+ *           precision is provided in the format, this will be zero.  And,
+ *           unfortunately in this case, it will be treated literally as
+ *           a precision of zero.
+ *   flags - Only ALTFORM and SHOWPLUS flags are supported.  ALTFORM only
+ *           applies if prec == 0 which is not supported anyway.
+ *   value - The floating point value to convert.
+ *
+ ****************************************************************************/
+
+static void lib_dtoa(FAR struct lib_outstream_s *obj, int fmt, int prec,
+                     uint8_t flags, double value)
+{
+  FAR char *digits;     /* String returned by __dtoa */
+  FAR char *digalloc;   /* Copy of digits to be freed after usage */
+  FAR char *rve;        /* Points to the end of the return value */
+  int  expt;            /* Integer value of exponent */
+  int  numlen;          /* Actual number of digits returned by cvt */
+  int  nchars;          /* Number of characters to print */
+  int  dsgn;            /* Unused sign indicator */
+  int  i;
+
+  /* Non-zero... positive or negative */
+
+  if (value < 0)
+    {
+      value = -value;
+      SET_NEGATE(flags);
+    }
+
+  /* Perform the conversion */
+
+  digits   = __dtoa(value, 3, prec, &expt, &dsgn, &rve);
+  digalloc = digits;
+  numlen   = rve - digits;
+
+  if (IS_NEGATE(flags))
+    {
+      obj->put(obj, '-');
+    }
+  else if (IS_SHOWPLUS(flags))
+    {
+      obj->put(obj, '+');
+    }
+
+  /* Special case exact zero or the case where the number is smaller than
+   * the print precision.
+   */
+
+  if (value == 0 || expt < -prec)
+    {
+      /* kludge for __dtoa irregularity */
+
+      obj->put(obj, '0');
+
+      /* A decimal point is printed only in the alternate form or if a 
+       * particular precision is requested.
+       */
+
+      if (prec > 0 || IS_ALTFORM(flags))
+        {
+          obj->put(obj, '.');
+
+          /* Always print at least one digit to the right of the decimal point. */
+
+          prec = MAX(1, prec);
+        }
+    }
+
+  /* A non-zero value will be printed */
+
+  else
+    {
+
+      /* Handle the case where the value is less than 1.0 (in magnitude) and
+       * will need a leading zero.
+       */
+
+      if (expt <= 0)
+        {
+          /* Print a single zero to the left of the decimal point */
+
+          obj->put(obj, '0');
+
+          /* Print the decimal point */
+
+          obj->put(obj, '.');
+
+          /* Print any leading zeros to the right of the decimal point */
+
+          if (expt < 0)
+            {
+              nchars = MIN(-expt, prec);
+              zeroes(obj, nchars);
+              prec -= nchars;
+            }
+        }
+
+      /* Handle the general case where the value is greater than 1.0 (in
+       * magnitude).
+       */
+
+      else
+        {
+          /* Print the integer part to the left of the decimal point */
+
+          for (i = expt; i > 0; i--)
+            {
+              if (*digits != '\0')
+                { 
+                  obj->put(obj, *digits);
+                  digits++;
+                }
+              else
+                {
+                  obj->put(obj, '0');
+                }
+            }
+
+          /* Get the length of the fractional part */
+
+          numlen -= expt;
+
+          /* If there is no fractional part, then a decimal point is printed
+           * only in the alternate form or if a particular precision is
+           * requested.
+           */
+
+          if (numlen > 0 || prec > 0 || IS_ALTFORM(flags))
+            {
+              /* Print the decimal point */
+
+              obj->put(obj, '.');
+
+              /* Always print at least one digit to the right of the decimal
+               * point.
+               */
+
+              prec = MAX(1, prec);
+            }
+        }
+
+      /* If a precision was specified, then limit the number digits to the
+       * right of the decimal point.
+       */
+
+      if (prec > 0)
+        {
+          nchars = MIN(numlen, prec);
+        }
+      else
+        {
+          nchars = numlen;
+        }
+
+      /* Print the fractional part to the right of the decimal point */
+
+      for (i = nchars; i > 0; i--)
+        {
+          obj->put(obj, *digits);
+          digits++;
+        }
+
+      /* Decremnt to get the number of trailing zeroes to print */
+
+      prec -= nchars;
+    }
+
+  /* Finally, print any trailing zeroes */
+
+  zeroes(obj, prec);
+
+  /* Is this memory supposed to be freed or not? */
+
+#if 0
+  if (digalloc)
+    {
+      free(digalloc);
+    }
+#endif
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
diff --git a/nuttx/lib/stdio/lib_libfflush.c b/nuttx/lib/stdio/lib_libfflush.c
new file mode 100644
index 000000000..2a4fe2932
--- /dev/null
+++ b/nuttx/lib/stdio/lib_libfflush.c
@@ -0,0 +1,202 @@
+/****************************************************************************
+ * lib/stdio/lib_libfflush.c
+ *
+ *   Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_fflush
+ *
+ * Description:
+ *  The function lib_fflush() forces a write of all user-space buffered data for
+ *  the given output or update stream via the stream's underlying write
+ *  function.  The open status of the stream is unaffected.
+ *
+ * Parmeters:
+ *  stream - the stream to flush
+ *  bforce - flush must be complete.
+ *
+ * Return:
+ *  A negated errno value on failure, otherwise the number of bytes remaining
+ *  in the buffer.
+ *
+ ****************************************************************************/
+
+ssize_t lib_fflush(FAR FILE *stream, bool bforce)
+{
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+  FAR const unsigned char *src;
+  ssize_t bytes_written;
+  ssize_t nbuffer;
+
+  /* Return EBADF if the file is not opened for writing */
+
+  if (stream->fs_filedes < 0 || (stream->fs_oflags & O_WROK) == 0)
+    {
+      return -EBADF;
+    }
+
+  /* Make sure that we have exclusive access to the stream */
+
+  lib_take_semaphore(stream);
+
+  /* Make sure that the buffer holds valid data */
+
+  if (stream->fs_bufpos  != stream->fs_bufstart)
+    {
+       /* Make sure that the buffer holds buffered write data.  We do not
+        * support concurrent read/write buffer usage.
+        */
+
+       if (stream->fs_bufread != stream->fs_bufstart)
+        {
+          /* The buffer holds read data... just return zero meaning "no bytes
+           * remaining in the buffer."
+           */
+
+          lib_give_semaphore(stream);
+          return 0;
+        }
+
+      /* How many bytes of write data are used in the buffer now */
+
+      nbuffer = stream->fs_bufpos - stream->fs_bufstart;
+
+      /* Try to write that amount */
+
+      src = stream->fs_bufstart;
+      do
+        {
+          /* Perform the write */
+
+          bytes_written = write(stream->fs_filedes, src, nbuffer);
+          if (bytes_written < 0)
+            {
+              /* Write failed.  The cause of the failure is in 'errno'.
+               * returned the negated errno value.
+               */
+
+              lib_give_semaphore(stream);
+              return -get_errno();
+            }
+
+          /* Handle partial writes.  fflush() must either return with
+           * an error condition or with the data successfully flushed
+           * from the buffer.
+           */
+
+          src     += bytes_written;
+          nbuffer -= bytes_written;
+        }
+      while (bforce && nbuffer > 0);
+
+      /* Reset the buffer position to the beginning of the buffer */
+
+      stream->fs_bufpos = stream->fs_bufstart;
+
+      /* For the case of an incomplete write, nbuffer will be non-zero
+       * It will hold the number of bytes that were not written.
+       * Move the data down in the buffer to handle this (rare) case
+       */
+
+      while (nbuffer)
+       {
+         *stream->fs_bufpos++ = *src++;
+         --nbuffer;
+       }
+    }
+
+  /* Restore normal access to the stream and return the number of bytes
+   * remaining in the buffer.
+   */
+
+  lib_give_semaphore(stream);
+  return stream->fs_bufpos - stream->fs_bufstart;
+#else
+  /* Return no bytes remaining in the buffer */
+
+  return 0;
+#endif
+}
+
diff --git a/nuttx/lib/stdio/lib_libflushall.c b/nuttx/lib/stdio/lib_libflushall.c
new file mode 100644
index 000000000..9d0a89e9c
--- /dev/null
+++ b/nuttx/lib/stdio/lib_libflushall.c
@@ -0,0 +1,137 @@
+/****************************************************************************
+ * lib/stdio/lib_libflushall.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_flushall
+ *
+ * Description:
+ *   Called either (1) by the OS when a task exits, or (2) from fflush()
+ *   when a NULL stream argument is provided.
+ *
+ ****************************************************************************/
+
+int lib_flushall(FAR struct streamlist *list)
+{
+  int lasterrno = OK;
+  int ret;
+
+  /* Make sure that there are streams associated with this thread */
+
+  if (list)
+    {
+       int i;
+
+       /* Process each stream in the thread's stream list */
+
+       stream_semtake(list);
+       for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
+         {
+           FILE *stream = &list->sl_streams[i];
+
+           /* If the stream is open (i.e., assigned a non-negative file
+            * descriptor) and opened for writing, then flush all of the pending
+            * write data in the stream.
+            */
+
+           if (stream->fs_filedes >= 0 && (stream->fs_oflags & O_WROK) != 0)
+             {
+               /* Flush the writable FILE */
+
+               ret = lib_fflush(stream, true);
+               if (ret < 0)
+                 {
+                   /* An error occurred during the flush AND/OR we were unable
+                    * to flush all of the buffered write data.  Remember the
+                    * last errcode.
+                    */
+
+                   lasterrno = ret;
+                 }
+             }
+         }
+
+       stream_semgive(list);
+    }
+
+  /* If any flush failed, return the errorcode of the last failed flush */
+
+  return lasterrno;
+}
diff --git a/nuttx/lib/stdio/lib_libfread.c b/nuttx/lib/stdio/lib_libfread.c
new file mode 100644
index 000000000..5585acbae
--- /dev/null
+++ b/nuttx/lib/stdio/lib_libfread.c
@@ -0,0 +1,315 @@
+/****************************************************************************
+ * lib/stdio/lib_libfread.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>  /* for CONFIG_STDIO_BUFFER_SIZE */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_fread
+ ****************************************************************************/
+
+ssize_t lib_fread(FAR void *ptr, size_t count, FAR FILE *stream)
+{
+  unsigned char *dest  = (unsigned char*)ptr;
+  ssize_t        bytes_read;
+  int            ret;
+
+  /* Make sure that reading from this stream is allowed */
+
+  if (!stream || (stream->fs_oflags & O_RDOK) == 0)
+    {
+      set_errno(EBADF);
+      bytes_read = -1;
+    }
+  else
+    {
+      /* The stream must be stable until we complete the read */
+
+      lib_take_semaphore(stream);
+
+#if CONFIG_NUNGET_CHARS > 0
+      /* First, re-read any previously ungotten characters */
+
+      while ((stream->fs_nungotten > 0) && (count > 0))
+        {
+          /* Decrement the count of ungotten bytes to get an index */
+
+          stream->fs_nungotten--;
+
+          /* Return the last ungotten byte */
+
+          *dest++ = stream->fs_ungotten[stream->fs_nungotten];
+
+          /* That's one less byte that we have to read */
+
+          count--;
+        }
+#endif
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+      /* If the buffer is currently being used for write access, then
+       * flush all of the buffered write data.  We do not support concurrent
+       * buffered read/write access.
+       */
+
+      ret = lib_wrflush(stream);
+      if (ret < 0)
+        {
+          lib_give_semaphore(stream);
+          return ret;
+        }
+
+      /* Now get any other needed chars from the buffer or the file. */
+
+      while (count > 0)
+        {
+          /* Is there readable data in the buffer? */
+
+          while ((count > 0) && (stream->fs_bufpos < stream->fs_bufread))
+            {
+              /* Yes, copy a byte into the user buffer */
+
+              *dest++ = *stream->fs_bufpos++;
+              count--;
+            }
+
+          /* The buffer is empty OR we have already supplied the number of
+           * bytes requested in the read.  Check if we need to read
+           * more from the file.
+           */
+
+          if (count > 0)
+            {
+              size_t buffer_available;
+
+              /* We need to read more data into the buffer from the file */
+
+              /* Mark the buffer empty */
+
+              stream->fs_bufpos = stream->fs_bufread = stream->fs_bufstart;
+
+              /* How much space is available in the buffer? */
+
+              buffer_available = stream->fs_bufend - stream->fs_bufread;
+
+              /* Will the number of bytes that we need to read fit into
+               * the buffer space that is available? If the read size is
+               * larger than the buffer, then read some of the data
+               * directly into the user's buffer.
+               */
+
+              if (count > buffer_available)
+                {
+                  bytes_read = read(stream->fs_filedes, dest, count);
+                  if (bytes_read < 0)
+                    {
+                      /* An error occurred on the read.  The error code is
+                       * in the 'errno' variable.
+                       */
+
+                      goto errout_with_errno;
+                    }
+                  else if (bytes_read == 0)
+                    {
+                      /* We are at the end of the file.  But we may already
+                       * have buffered data.  In that case, we will report
+                       * the EOF indication later.
+                       */
+
+                      goto shortread;
+                    }
+                  else
+                    {
+                      /* Some bytes were read. Adjust the dest pointer */
+
+                      dest  += bytes_read;
+
+                      /* Were all of the requested bytes read? */
+
+                      if (bytes_read < count)
+                        {
+                          /* No.  We must be at the end of file. */
+
+                          goto shortread;
+                        }
+                      else
+                        {
+                          /* Yes.  We are done. */
+
+                          count = 0;
+                        }
+                    }
+                }
+              else
+                {
+                  /* The number of bytes required to satisfy the read
+                   * is less than or equal to the size of the buffer
+                   * space that we have left. Read as much as we can
+                   * into the buffer.
+                   */
+
+                  bytes_read = read(stream->fs_filedes, stream->fs_bufread, buffer_available);
+                  if (bytes_read < 0)
+                    {
+                      /* An error occurred on the read.  The error code is
+                       * in the 'errno' variable.
+                       */
+
+                      goto errout_with_errno;
+                    }
+                  else if (bytes_read == 0)
+                    {
+                      /* We are at the end of the file.  But we may already
+                       * have buffered data.  In that case, we will report
+                       * the EOF indication later.
+                       */
+
+                      goto shortread;
+                    }
+                  else
+                    {
+                      /* Some bytes were read */
+
+                      stream->fs_bufread += bytes_read;
+                    }
+                }
+            }
+        }
+#else
+      /* Now get any other needed chars from the file. */
+
+      while (count > 0)
+        {
+          bytes_read = read(stream->fs_filedes, dest, count);
+          if (bytes_read < 0)
+            {
+              /* An error occurred on the read.  The error code is
+               * in the 'errno' variable.
+               */
+
+              goto errout_with_errno;
+            }
+          else if (bytes_read == 0)
+            {
+              /* We are at the end of the file.  But we may already
+               * have buffered data.  In that case, we will report
+               * the EOF indication later.
+               */
+
+              break;
+            }
+          else
+            {
+              dest  += bytes_read;
+              count -= bytes_read;
+            }
+        }
+#endif
+      /* Here after a successful (but perhaps short) read */
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+    shortread:
+#endif
+      bytes_read = dest - (unsigned char*)ptr;
+
+      /* Set or clear the EOF indicator.  If we get here because of a
+       * short read and the total number of* bytes read is zero, then
+       * we must be at the end-of-file.
+       */
+
+      if (bytes_read > 0)
+        {
+          stream->fs_flags &= ~__FS_FLAG_EOF;
+        }
+      else
+        {
+          stream->fs_flags |= __FS_FLAG_EOF;
+        }
+    }
+
+  lib_give_semaphore(stream);
+  return bytes_read;  
+
+/* Error exits */
+
+errout_with_errno:
+  lib_give_semaphore(stream);
+  return -get_errno();  
+}
+
diff --git a/nuttx/lib/stdio/lib_libfwrite.c b/nuttx/lib/stdio/lib_libfwrite.c
new file mode 100644
index 000000000..e71866b49
--- /dev/null
+++ b/nuttx/lib/stdio/lib_libfwrite.c
@@ -0,0 +1,179 @@
+/****************************************************************************
+ * lib/stdio/lib_libfwrite.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>  /* for CONFIG_STDIO_BUFFER_SIZE */
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_fwrite
+ ****************************************************************************/
+
+ssize_t lib_fwrite(FAR const void *ptr, size_t count, FAR FILE *stream)
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+{
+  FAR const unsigned char *start = ptr;
+  FAR const unsigned char *src   = ptr;
+  ssize_t ret = ERROR;
+  unsigned char *dest;
+
+  /* Make sure that writing to this stream is allowed */
+
+  if (!stream || (stream->fs_oflags & O_WROK) == 0)
+    {
+      set_errno(EBADF);
+      goto errout;
+    }
+
+  /* Get exclusive access to the stream */
+
+  lib_take_semaphore(stream);
+
+  /* If the buffer is currently being used for read access, then
+   * discard all of the read-ahead data.  We do not support concurrent
+   * buffered read/write access.
+   */
+
+  if (lib_rdflush(stream) < 0)
+    {
+      goto errout_with_semaphore;
+    }
+
+  /* Loop until all of the bytes have been buffered */
+
+  while (count > 0)
+    {
+      /* Determine the number of bytes left in the buffer */
+
+      size_t gulp_size = stream->fs_bufend - stream->fs_bufpos;
+
+      /* Will the user data fit into the amount of buffer space
+       * that we have left?
+       */
+
+      if (gulp_size > count)
+        {
+          /* Yes, clip the gulp to the size of the user data */
+
+          gulp_size = count;
+        }
+
+      /* Adjust the number of bytes remaining to be transferred
+       * on the next pass through the loop (might be zero).
+       */
+
+      count -= gulp_size;
+
+      /* Transfer the data into the buffer */
+
+      for (dest = stream->fs_bufpos; gulp_size > 0; gulp_size--)
+        {
+          *dest++ = *src++;
+        }
+      stream->fs_bufpos = dest;
+
+      /* Is the buffer full? */
+
+      if (dest >= stream->fs_bufend)
+        {
+          /* Flush the buffered data to the IO stream */
+
+          int bytes_buffered = lib_fflush(stream, false);
+          if (bytes_buffered < 0)
+            {
+              goto errout_with_semaphore;
+            }
+        }
+    }
+
+  /* Return the number of bytes written */
+
+  ret = src - start;
+
+errout_with_semaphore:
+  lib_give_semaphore(stream);
+
+errout:
+  return ret;
+}
+#else
+{
+  return write(stream->fs_filedes, ptr, count);
+}
+#endif /* CONFIG_STDIO_BUFFER_SIZE */
+
diff --git a/nuttx/lib/stdio/lib_libnoflush.c b/nuttx/lib/stdio/lib_libnoflush.c
new file mode 100644
index 000000000..e3b891153
--- /dev/null
+++ b/nuttx/lib/stdio/lib_libnoflush.c
@@ -0,0 +1,103 @@
+/****************************************************************************
+ * lib/stdio/lib_libnoflush.c
+ *
+ *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#include "lib_internal.h"
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_noflush
+ *
+ * Description:
+ *  lib_noflush() provides a common, dummy flush method for output streams
+ *  that are not flushable.  Only used if CONFIG_STDIO_LINEBUFFER is selected.
+ *
+ * Return:
+ *  Always returns OK
+ *
+ ****************************************************************************/
+
+int lib_noflush(FAR struct lib_outstream_s *this)
+{
+  return OK;
+}
+
+#endif /* CONFIG_STDIO_LINEBUFFER */
+
diff --git a/nuttx/lib/stdio/lib_libsprintf.c b/nuttx/lib/stdio/lib_libsprintf.c
new file mode 100644
index 000000000..2474a6f01
--- /dev/null
+++ b/nuttx/lib/stdio/lib_libsprintf.c
@@ -0,0 +1,90 @@
+/****************************************************************************
+ * lib/stdio/lib_libsprintf.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_sprintf
+ ****************************************************************************/
+
+int lib_sprintf(FAR struct lib_outstream_s *obj, const char *fmt, ...)
+{
+  va_list ap;
+  int     n;
+
+  /* Let lib_vsprintf do the real work */
+
+  va_start(ap, fmt);
+  n = lib_vsprintf(obj, fmt, ap);
+  va_end(ap);
+  return n;
+}
diff --git a/nuttx/lib/stdio/lib_libvsprintf.c b/nuttx/lib/stdio/lib_libvsprintf.c
new file mode 100644
index 000000000..30c988599
--- /dev/null
+++ b/nuttx/lib/stdio/lib_libvsprintf.c
@@ -0,0 +1,1620 @@
+/****************************************************************************
+ * lib/stdio/lib_libvsprintf.c
+ *
+ *   Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <nuttx/arch.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+/* If you have floating point but no fieldwidth, then use a fixed (but
+ * configurable) floating point precision.
+ */
+
+#if defined(CONFIG_LIBC_FLOATINGPOINT) && \
+    defined(CONFIG_NOPRINTF_FIELDWIDTH) && \
+   !defined(CONFIG_LIBC_FIXEDPRECISION)
+#  define CONFIG_LIBC_FIXEDPRECISION 3
+#endif
+
+#define FLAG_SHOWPLUS            0x01
+#define FLAG_ALTFORM             0x02
+#define FLAG_HASDOT              0x04
+#define FLAG_HASASTERISKWIDTH    0x08
+#define FLAG_HASASTERISKTRUNC    0x10
+#define FLAG_LONGPRECISION       0x20
+#define FLAG_LONGLONGPRECISION   0x40
+#define FLAG_NEGATE              0x80
+
+#define SET_SHOWPLUS(f)          do (f) |= FLAG_SHOWPLUS; while (0)
+#define SET_ALTFORM(f)           do (f) |= FLAG_ALTFORM; while (0)
+#define SET_HASDOT(f)            do (f) |= FLAG_HASDOT; while (0)
+#define SET_HASASTERISKWIDTH(f)  do (f) |= FLAG_HASASTERISKWIDTH; while (0)
+#define SET_HASASTERISKTRUNC(f)  do (f) |= FLAG_HASASTERISKTRUNC; while (0)
+#define SET_LONGPRECISION(f)     do (f) |= FLAG_LONGPRECISION; while (0)
+#define SET_LONGLONGPRECISION(f) do (f) |= FLAG_LONGLONGPRECISION; while (0)
+#define SET_NEGATE(f)            do (f) |= FLAG_NEGATE; while (0)
+
+#define CLR_SHOWPLUS(f)          do (f) &= ~FLAG_SHOWPLUS; while (0)
+#define CLR_ALTFORM(f)           do (f) &= ~FLAG_ALTFORM; while (0)
+#define CLR_HASDOT(f)            do (f) &= ~FLAG_HASDOT; while (0)
+#define CLR_HASASTERISKWIDTH(f)  do (f) &= ~FLAG_HASASTERISKWIDTH; while (0)
+#define CLR_HASASTERISKTRUNC(f)  do (f) &= ~FLAG_HASASTERISKTRUNC; while (0)
+#define CLR_LONGPRECISION(f)     do (f) &= ~FLAG_LONGPRECISION; while (0)
+#define CLR_LONGLONGPRECISION(f) do (f) &= ~FLAG_LONGLONGPRECISION; while (0)
+#define CLR_NEGATE(f)            do (f) &= ~FLAG_NEGATE; while (0)
+#define CLR_SIGNED(f)            do (f) &= ~(FLAG_SHOWPLUS|FLAG_NEGATE); while (0)
+
+#define IS_SHOWPLUS(f)           (((f) & FLAG_SHOWPLUS) != 0)
+#define IS_ALTFORM(f)            (((f) & FLAG_ALTFORM) != 0)
+#define IS_HASDOT(f)             (((f) & FLAG_HASDOT) != 0)
+#define IS_HASASTERISKWIDTH(f)   (((f) & FLAG_HASASTERISKWIDTH) != 0)
+#define IS_HASASTERISKTRUNC(f)   (((f) & FLAG_HASASTERISKTRUNC) != 0)
+#define IS_LONGPRECISION(f)      (((f) & FLAG_LONGPRECISION) != 0)
+#define IS_LONGLONGPRECISION(f)  (((f) & FLAG_LONGLONGPRECISION) != 0)
+#define IS_NEGATE(f)             (((f) & FLAG_NEGATE) != 0)
+#define IS_SIGNED(f)             (((f) & (FLAG_SHOWPLUS|FLAG_NEGATE)) != 0)
+
+/* If CONFIG_ARCH_ROMGETC is defined, then it is assumed that the format
+ * string data cannot be accessed by simply de-referencing the format string
+ * pointer.  This might be in the case in Harvard architectures where string
+ * data might be stored in instruction space or if string data were stored
+ * on some media like EEPROM or external serial FLASH.  In all of these cases,
+ * string data has to be accessed indirectly using the architecture-supplied
+ * up_romgetc().  The following mechanisms attempt to make these different
+ * access methods indistinguishable in the following code.
+ *
+ * NOTE: It is assumed that string arguments for %s still reside in memory
+ * that can be directly accessed by de-referencing the string pointer.
+ */
+
+#ifdef CONFIG_ARCH_ROMGETC
+#  define FMT_TOP      ch = up_romgetc(src)         /* Loop initialization */
+#  define FMT_BOTTOM   src++, ch = up_romgetc(src)  /* Bottom of a loop */
+#  define FMT_CHAR     ch                           /* Access a character */
+#  define FMT_NEXT     src++; ch = up_romgetc(src)  /* Advance to the next character */
+#  define FMT_PREV     src--; ch = up_romgetc(src)  /* Backup to the previous character */
+#else
+#  define FMT_TOP                                   /* Loop initialization */
+#  define FMT_BOTTOM   src++                        /* Bottom of a loop */
+#  define FMT_CHAR     *src                         /* Access a character */
+#  define FMT_NEXT     src++                        /* Advance to the next character */
+#  define FMT_PREV     src--                        /* Backup to the previous character */
+#endif
+ 
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+enum
+{
+  FMT_RJUST = 0, /* Default */
+  FMT_LJUST,
+  FMT_RJUST0,
+  FMT_CENTER
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/* Pointer to ASCII conversion */
+
+#ifdef CONFIG_PTR_IS_NOT_INT
+static void ptohex(FAR struct lib_outstream_s *obj, uint8_t flags, FAR void *p);
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static int  getsizesize(uint8_t fmt, uint8_t flags, FAR void *p)
+#endif /* CONFIG_NOPRINTF_FIELDWIDTH */
+#endif /* CONFIG_PTR_IS_NOT_INT */
+
+/* Unsigned int to ASCII conversion */
+
+static void utodec(FAR struct lib_outstream_s *obj, unsigned int n);
+static void utohex(FAR struct lib_outstream_s *obj, unsigned int n, uint8_t a);
+static void utooct(FAR struct lib_outstream_s *obj, unsigned int n);
+static void utobin(FAR struct lib_outstream_s *obj, unsigned int n);
+static void utoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
+                     uint8_t flags, unsigned int lln);
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void fixup(uint8_t fmt, FAR uint8_t *flags, int *n);
+static int  getusize(uint8_t fmt, uint8_t flags, unsigned int lln);
+#endif
+
+/* Unsigned long int to ASCII conversion */
+
+#ifdef CONFIG_LONG_IS_NOT_INT
+static void lutodec(FAR struct lib_outstream_s *obj, unsigned long ln);
+static void lutohex(FAR struct lib_outstream_s *obj, unsigned long ln, uint8_t a);
+static void lutooct(FAR struct lib_outstream_s *obj, unsigned long ln);
+static void lutobin(FAR struct lib_outstream_s *obj, unsigned long ln);
+static void lutoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
+                      uint8_t flags, unsigned long ln);
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void lfixup(uint8_t fmt, FAR uint8_t *flags, long *ln);
+static int  getlusize(uint8_t fmt, FAR uint8_t flags, unsigned long ln);
+#endif
+#endif
+
+/* Unsigned long long int to ASCII conversions */
+
+#ifdef CONFIG_HAVE_LONG_LONG
+static void llutodec(FAR struct lib_outstream_s *obj, unsigned long long lln);
+static void llutohex(FAR struct lib_outstream_s *obj, unsigned long long lln, uint8_t a);
+static void llutooct(FAR struct lib_outstream_s *obj, unsigned long long lln);
+static void llutobin(FAR struct lib_outstream_s *obj, unsigned long long lln);
+static void llutoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
+                       uint8_t flags, unsigned long long lln);
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void llfixup(uint8_t fmt, FAR uint8_t *flags, FAR long long *lln);
+static int  getllusize(uint8_t fmt, FAR uint8_t flags, FAR unsigned long long lln);
+#endif
+#endif
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void prejustify(FAR struct lib_outstream_s *obj, uint8_t fmt,
+                       uint8_t flags, int fieldwidth, int valwidth);
+static void postjustify(FAR struct lib_outstream_s *obj, uint8_t fmt,
+                        uint8_t flags, int fieldwidth, int valwidth);
+#endif
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+static const char g_nullstring[] = "(null)";
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/* Include floating point functions */
+ 
+#ifdef CONFIG_LIBC_FLOATINGPOINT
+#  include "stdio/lib_libdtoa.c"
+#endif
+
+/****************************************************************************
+ * Name: ptohex
+ ****************************************************************************/
+
+#ifdef CONFIG_PTR_IS_NOT_INT
+static void ptohex(FAR struct lib_outstream_s *obj, uint8_t flags, FAR void *p)
+{
+  union
+  {
+    uint32_t  dw;
+    FAR void *p;
+  } u;
+  uint8_t bits;
+
+  /* Check for alternate form */
+
+  if (IS_ALTFORM(flags))
+    {
+      /* Prefix the number with "0x" */
+
+      obj->put(obj, '0');
+      obj->put(obj, 'x');
+    }
+
+  u.dw = 0;
+  u.p  = p;
+
+  for (bits = 8*sizeof(void *); bits > 0; bits -= 4)
+    {
+      uint8_t nibble = (uint8_t)((u.dw >> (bits - 4)) & 0xf);
+      if (nibble < 10)
+        {
+          obj->put(obj, nibble + '0');
+        }
+      else
+        {
+          obj->put(obj, nibble + 'a' - 10);
+        }
+    }
+}
+
+/****************************************************************************
+ * Name: getpsize
+ ****************************************************************************/
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static int getpsize(uint8_t flags, FAR void *p)
+{
+  struct lib_outstream_s nulloutstream;
+  lib_nulloutstream(&nulloutstream);
+
+  ptohex(&nulloutstream, flags, p);
+  return nulloutstream.nput;
+}
+
+#endif /* CONFIG_NOPRINTF_FIELDWIDTH */
+#endif /* CONFIG_PTR_IS_NOT_INT */
+
+/****************************************************************************
+ * Name: utodec
+ ****************************************************************************/
+
+static void utodec(FAR struct lib_outstream_s *obj, unsigned int n)
+{
+  unsigned int remainder = n % 10;
+  unsigned int dividend  = n / 10;
+
+  if (dividend)
+    {
+      utodec(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: utohex
+ ****************************************************************************/
+
+static void utohex(FAR struct lib_outstream_s *obj, unsigned int n, uint8_t a)
+{
+  bool    nonzero = false;
+  uint8_t bits;
+
+  for (bits = 8*sizeof(unsigned int); bits > 0; bits -= 4)
+    {
+      uint8_t nibble = (uint8_t)((n >> (bits - 4)) & 0xf);
+      if (nibble || nonzero)
+        {
+          nonzero = true;
+
+          if (nibble < 10)
+            {
+              obj->put(obj, nibble + '0');
+            }
+          else
+            {
+              obj->put(obj, nibble + a - 10);
+            }
+        }
+    }
+
+  if (!nonzero)
+    {
+      obj->put(obj, '0');
+    }
+}
+
+/****************************************************************************
+ * Name: utooct
+ ****************************************************************************/
+
+static void utooct(FAR struct lib_outstream_s *obj, unsigned int n)
+{
+  unsigned int remainder = n & 0x7;
+  unsigned int dividend = n >> 3;
+
+  if (dividend)
+    {
+      utooct(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: utobin
+ ****************************************************************************/
+
+static void utobin(FAR struct lib_outstream_s *obj, unsigned int n)
+{
+  unsigned int remainder = n & 1;
+  unsigned int dividend = n >> 1;
+
+  if (dividend)
+    {
+      utobin(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: utoascii
+ ****************************************************************************/
+
+static void utoascii(FAR struct lib_outstream_s *obj, uint8_t fmt, uint8_t flags, unsigned int n)
+{
+  /* Perform the integer conversion according to the format specifier */
+
+  switch (fmt)
+    {
+      case 'd':
+      case 'i':
+        /* Signed base 10 */
+        {
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+          if ((int)n < 0)
+            {
+              obj->put(obj, '-');
+              n = (unsigned int)(-(int)n);
+            }
+          else if (IS_SHOWPLUS(flags))
+            {
+              obj->put(obj, '+');
+            }
+#endif
+          /* Convert the unsigned value to a string. */
+
+          utodec(obj, n);
+        }
+        break;
+
+      case 'u':
+        /* Unigned base 10 */
+        {
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+          if (IS_SHOWPLUS(flags))
+            {
+              obj->put(obj, '+');
+            }
+#endif
+          /* Convert the unsigned value to a string. */
+
+          utodec(obj, n);
+        }
+        break;
+
+#ifndef CONFIG_PTR_IS_NOT_INT
+      case 'p':
+#endif
+      case 'x':
+      case 'X':
+        /* Hexadecimal */
+        {
+          /* Check for alternate form */
+
+          if (IS_ALTFORM(flags))
+            {
+              /* Prefix the number with "0x" */
+
+              obj->put(obj, '0');
+              obj->put(obj, 'x');
+            }
+
+          /* Convert the unsigned value to a string. */
+
+          if (fmt == 'X')
+            {
+              utohex(obj, n, 'A');
+            }
+          else
+            {
+              utohex(obj, n, 'a');
+            }
+        }
+        break;
+
+      case 'o':
+        /* Octal */
+         {
+           /* Check for alternate form */
+
+           if (IS_ALTFORM(flags))
+             {
+               /* Prefix the number with '0' */
+
+               obj->put(obj, '0');
+             }
+
+           /* Convert the unsigned value to a string. */
+
+           utooct(obj, n);
+         }
+         break;
+
+      case 'b':
+        /* Binary */
+        {
+          /* Convert the unsigned value to a string. */
+
+          utobin(obj, n);
+        }
+        break;
+
+#ifdef CONFIG_PTR_IS_NOT_INT
+      case 'p':
+#endif
+      default:
+        break;
+    }
+}
+
+/****************************************************************************
+ * Name: fixup
+ ****************************************************************************/
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void fixup(uint8_t fmt, FAR uint8_t *flags, FAR int *n)
+{
+  /* Perform the integer conversion according to the format specifier */
+
+  switch (fmt)
+    {
+      case 'd':
+      case 'i':
+        /* Signed base 10 */
+
+        if (*n < 0)
+          {
+            SET_NEGATE(*flags);
+            CLR_SHOWPLUS(*flags);
+            *n    = -*n;
+          }
+        break;
+
+      case 'u':
+        /* Unsigned base 10 */
+        break;
+
+      case 'p':
+      case 'x':
+      case 'X':
+        /* Hexadecimal */
+      case 'o':
+        /* Octal */
+      case 'b':
+        /* Binary */
+        CLR_SIGNED(*flags);
+        break;
+
+      default:
+        break;
+    }
+}
+
+/****************************************************************************
+ * Name: getusize
+ ****************************************************************************/
+
+static int getusize(uint8_t fmt, uint8_t flags, unsigned int n)
+{
+  struct lib_outstream_s nulloutstream;
+  lib_nulloutstream(&nulloutstream);
+
+  utoascii(&nulloutstream, fmt, flags, n);
+  return nulloutstream.nput;
+}
+
+/****************************************************************************
+ * Name: getdblsize
+ ****************************************************************************/
+
+#ifdef CONFIG_LIBC_FLOATINGPOINT
+static int getdblsize(uint8_t fmt, int trunc, uint8_t flags, double n)
+{
+  struct lib_outstream_s nulloutstream;
+  lib_nulloutstream(&nulloutstream);
+
+  lib_dtoa(&nulloutstream, fmt, trunc, flags, n);
+  return nulloutstream.nput;
+}
+#endif
+#endif /* CONFIG_NOPRINTF_FIELDWIDTH */
+
+#ifdef CONFIG_LONG_IS_NOT_INT
+/****************************************************************************
+ * Name: lutodec
+ ****************************************************************************/
+
+static void lutodec(FAR struct lib_outstream_s *obj, unsigned long n)
+{
+  unsigned int  remainder = n % 10;
+  unsigned long dividend  = n / 10;
+
+  if (dividend)
+    {
+      lutodec(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: lutohex
+ ****************************************************************************/
+
+static void lutohex(FAR struct lib_outstream_s *obj, unsigned long n, uint8_t a)
+{
+  bool    nonzero = false;
+  uint8_t bits;
+
+  for (bits = 8*sizeof(unsigned long); bits > 0; bits -= 4)
+    {
+      uint8_t nibble = (uint8_t)((n >> (bits - 4)) & 0xf);
+      if (nibble || nonzero)
+        {
+          nonzero = true;
+
+          if (nibble < 10)
+            {
+              obj->put(obj, nibble + '0');
+            }
+          else
+            {
+              obj->put(obj, nibble + a - 10);
+            }
+        }
+    }
+
+  if (!nonzero)
+    {
+      obj->put(obj, '0');
+    }
+}
+
+/****************************************************************************
+ * Name: lutooct
+ ****************************************************************************/
+
+static void lutooct(FAR struct lib_outstream_s *obj, unsigned long n)
+{
+  unsigned int  remainder = n & 0x7;
+  unsigned long dividend  = n >> 3;
+
+  if (dividend)
+    {
+      lutooct(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: lutobin
+ ****************************************************************************/
+
+static void lutobin(FAR struct lib_outstream_s *obj, unsigned long n)
+{
+  unsigned int  remainder = n & 1;
+  unsigned long dividend  = n >> 1;
+
+  if (dividend)
+    {
+      lutobin(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: lutoascii
+ ****************************************************************************/
+
+static void lutoascii(FAR struct lib_outstream_s *obj, uint8_t fmt, uint8_t flags, unsigned long ln)
+{
+  /* Perform the integer conversion according to the format specifier */
+
+  switch (fmt)
+    {
+      case 'd':
+      case 'i':
+        /* Signed base 10 */
+        {
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+          if ((long)ln < 0)
+            {
+              obj->put(obj, '-');
+              ln    = (unsigned long)(-(long)ln);
+            }
+          else if (IS_SHOWPLUS(flags))
+            {
+              obj->put(obj, '+');
+            }
+#endif
+          /* Convert the unsigned value to a string. */
+
+          lutodec(obj, ln);
+        }
+        break;
+
+      case 'u':
+        /* Unigned base 10 */
+        {
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+          if (IS_SHOWPLUS(flags))
+            {
+              obj->put(obj, '+');
+            }
+#endif
+          /* Convert the unsigned value to a string. */
+
+          lutodec(obj, ln);
+        }
+        break;
+
+      case 'x':
+      case 'X':
+        /* Hexadecimal */
+        {
+          /* Check for alternate form */
+
+          if (IS_ALTFORM(flags))
+            {
+              /* Prefix the number with "0x" */
+
+              obj->put(obj, '0');
+              obj->put(obj, 'x');
+            }
+
+          /* Convert the unsigned value to a string. */
+
+          if (fmt == 'X')
+            {
+              lutohex(obj, ln, 'A');
+            }
+          else
+            {
+              lutohex(obj, ln, 'a');
+            }
+        }
+        break;
+
+      case 'o':
+        /* Octal */
+         {
+           /* Check for alternate form */
+
+           if (IS_ALTFORM(flags))
+             {
+               /* Prefix the number with '0' */
+
+               obj->put(obj, '0');
+             }
+
+           /* Convert the unsigned value to a string. */
+
+           lutooct(obj, ln);
+         }
+         break;
+
+      case 'b':
+        /* Binary */
+        {
+          /* Convert the unsigned value to a string. */
+
+          lutobin(obj, ln);
+        }
+        break;
+
+      case 'p':
+      default:
+        break;
+    }
+}
+
+/****************************************************************************
+ * Name: lfixup
+ ****************************************************************************/
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void lfixup(uint8_t fmt, FAR uint8_t *flags, FAR long *ln)
+{
+  /* Perform the integer conversion according to the format specifier */
+
+  switch (fmt)
+    {
+      case 'd':
+      case 'i':
+        /* Signed base 10 */
+
+        if (*ln < 0)
+          {
+            SET_NEGATE(*flags);
+            CLR_SHOWPLUS(*flags);
+            *ln    = -*ln;
+          }
+        break;
+
+      case 'u':
+        /* Unsigned base 10 */
+        break;
+
+      case 'p':
+      case 'x':
+      case 'X':
+        /* Hexadecimal */
+      case 'o':
+        /* Octal */
+      case 'b':
+        /* Binary */
+        CLR_SIGNED(*flags);
+        break;
+
+      default:
+        break;
+    }
+}
+
+/****************************************************************************
+ * Name: getlusize
+ ****************************************************************************/
+
+static int getlusize(uint8_t fmt, uint8_t flags, unsigned long ln)
+{
+  struct lib_outstream_s nulloutstream;
+  lib_nulloutstream(&nulloutstream);
+
+  lutoascii(&nulloutstream, fmt, flags, ln);
+  return nulloutstream.nput;
+}
+
+#endif /* CONFIG_NOPRINTF_FIELDWIDTH */
+#endif /* CONFIG_LONG_IS_NOT_INT */
+
+#ifdef CONFIG_HAVE_LONG_LONG
+/****************************************************************************
+ * Name: llutodec
+ ****************************************************************************/
+
+static void llutodec(FAR struct lib_outstream_s *obj, unsigned long long n)
+{
+  unsigned int remainder = n % 10;
+  unsigned long long dividend = n / 10;
+
+  if (dividend)
+    {
+      llutodec(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: llutohex
+ ****************************************************************************/
+
+static void llutohex(FAR struct lib_outstream_s *obj, unsigned long long n, uint8_t a)
+{
+  bool    nonzero = false;
+  uint8_t bits;
+
+  for (bits = 8*sizeof(unsigned long long); bits > 0; bits -= 4)
+    {
+      uint8_t nibble = (uint8_t)((n >> (bits - 4)) & 0xf);
+      if (nibble || nonzero)
+        {
+          nonzero = true;
+
+          if (nibble < 10)
+            {
+              obj->put(obj, (nibble + '0'));
+            }
+          else
+            {
+              obj->put(obj, (nibble + a - 10));
+            }
+        }
+    }
+
+  if (!nonzero)
+    {
+      obj->put(obj, '0');
+    }
+}
+
+/****************************************************************************
+ * Name: llutooct
+ ****************************************************************************/
+
+static void llutooct(FAR struct lib_outstream_s *obj, unsigned long long n)
+{
+  unsigned int remainder = n & 0x7;
+  unsigned long long dividend = n >> 3;
+
+  if (dividend)
+    {
+      llutooct(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: llutobin
+ ****************************************************************************/
+
+static void llutobin(FAR struct lib_outstream_s *obj, unsigned long long n)
+{
+  unsigned int remainder = n & 1;
+  unsigned long long dividend = n >> 1;
+
+  if (dividend)
+    {
+      llutobin(obj, dividend);
+    }
+
+  obj->put(obj, (remainder + (unsigned int)'0'));
+}
+
+/****************************************************************************
+ * Name: llutoascii
+ ****************************************************************************/
+
+static void llutoascii(FAR struct lib_outstream_s *obj, uint8_t fmt, uint8_t flags, unsigned long long lln)
+{
+  /* Perform the integer conversion according to the format specifier */
+
+  switch (fmt)
+    {
+      case 'd':
+      case 'i':
+        /* Signed base 10 */
+        {
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+          if ((long long)lln < 0)
+            {
+              obj->put(obj, '-');
+              lln    = (unsigned long long)(-(long long)lln);
+            }
+          else if (IS_SHOWPLUS(flags))
+            {
+              obj->put(obj, '+');
+            }
+#endif
+          /* Convert the unsigned value to a string. */
+
+          llutodec(obj, (unsigned long long)lln);
+        }
+        break;
+
+      case 'u':
+        /* Unigned base 10 */
+        {
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+          if (IS_SHOWPLUS(flags))
+            {
+              obj->put(obj, '+');
+            }
+#endif
+          /* Convert the unsigned value to a string. */
+
+          llutodec(obj, (unsigned long long)lln);
+        }
+        break;
+
+      case 'x':
+      case 'X':
+        /* Hexadecimal */
+        {
+          /* Check for alternate form */
+
+          if (IS_ALTFORM(flags))
+            {
+              /* Prefix the number with "0x" */
+
+              obj->put(obj, '0');
+              obj->put(obj, 'x');
+            }
+
+          /* Convert the unsigned value to a string. */
+
+          if (fmt == 'X')
+            {
+              llutohex(obj, (unsigned long long)lln, 'A');
+            }
+          else
+            {
+              llutohex(obj, (unsigned long long)lln, 'a');
+            }
+        }
+        break;
+
+      case 'o':
+        /* Octal */
+         {
+           /* Check for alternate form */
+
+           if (IS_ALTFORM(flags))
+             {
+               /* Prefix the number with '0' */
+
+               obj->put(obj, '0');
+             }
+
+           /* Convert the unsigned value to a string. */
+
+           llutooct(obj, (unsigned long long)lln);
+         }
+         break;
+
+      case 'b':
+        /* Binary */
+        {
+          /* Convert the unsigned value to a string. */
+
+          llutobin(obj, (unsigned long long)lln);
+        }
+        break;
+
+      case 'p':
+      default:
+        break;
+    }
+}
+
+/****************************************************************************
+ * Name: llfixup
+ ****************************************************************************/
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void llfixup(uint8_t fmt, FAR uint8_t *flags, FAR long long *lln)
+{
+  /* Perform the integer conversion according to the format specifier */
+
+  switch (fmt)
+    {
+      case 'd':
+      case 'i':
+        /* Signed base 10 */
+
+        if (*lln < 0)
+          {
+            SET_NEGATE(*flags);
+            CLR_SHOWPLUS(*flags);
+            *lln    = -*lln;
+          }
+        break;
+
+      case 'u':
+        /* Unsigned base 10 */
+        break;
+
+      case 'p':
+      case 'x':
+      case 'X':
+        /* Hexadecimal */
+      case 'o':
+        /* Octal */
+      case 'b':
+        /* Binary */
+        CLR_SIGNED(*flags);
+        break;
+
+      default:
+        break;
+    }
+}
+
+/****************************************************************************
+ * Name: getllusize
+ ****************************************************************************/
+
+static int getllusize(uint8_t fmt, uint8_t flags, unsigned long long lln)
+{
+  struct lib_outstream_s nulloutstream;
+  lib_nulloutstream(&nulloutstream);
+
+
+  llutoascii(&nulloutstream, fmt, flags, lln);
+  return nulloutstream.nput;
+}
+
+#endif /* CONFIG_NOPRINTF_FIELDWIDTH */
+#endif /* CONFIG_HAVE_LONG_LONG */
+
+/****************************************************************************
+ * Name: prejustify
+ ****************************************************************************/
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void prejustify(FAR struct lib_outstream_s *obj, uint8_t fmt,
+                       uint8_t flags, int fieldwidth, int valwidth)
+{
+  int i;
+
+  switch (fmt)
+    {
+      default:
+      case FMT_RJUST:
+        if (IS_SIGNED(flags))
+          {
+            valwidth++;
+          }
+
+        for (i = fieldwidth - valwidth; i > 0; i--)
+          {
+            obj->put(obj, ' ');
+          }
+
+        if (IS_NEGATE(flags))
+          {
+            obj->put(obj, '-');
+          }
+        else if (IS_SHOWPLUS(flags))
+          {
+            obj->put(obj, '+');
+          }
+        break;
+
+      case FMT_RJUST0:
+         if (IS_NEGATE(flags))
+          {
+            obj->put(obj, '-');
+            valwidth++;
+          }
+        else if (IS_SHOWPLUS(flags))
+          {
+            obj->put(obj, '+');
+            valwidth++;
+          }
+
+        for (i = fieldwidth - valwidth; i > 0; i--)
+          {
+            obj->put(obj, '0');
+          }
+        break;
+
+      case FMT_LJUST:
+         if (IS_NEGATE(flags))
+          {
+            obj->put(obj, '-');
+          }
+        else if (IS_SHOWPLUS(flags))
+          {
+            obj->put(obj, '+');
+          }
+        break;
+    }
+}
+#endif
+
+/****************************************************************************
+ * Name: postjustify
+ ****************************************************************************/
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+static void postjustify(FAR struct lib_outstream_s *obj, uint8_t fmt,
+                        uint8_t flags, int fieldwidth, int valwidth)
+{
+  int i;
+
+  /* Apply field justification to the integer value. */
+
+  switch (fmt)
+    {
+      default:
+      case FMT_RJUST:
+      case FMT_RJUST0:
+        break;
+
+      case FMT_LJUST:
+        if (IS_SIGNED(flags))
+          {
+            valwidth++;
+          }
+
+        for (i = fieldwidth - valwidth; i > 0; i--)
+          {
+            obj->put(obj, ' ');
+          }
+        break;
+    }
+}
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * lib/stdio/lib_vsprintf
+ ****************************************************************************/
+
+int lib_vsprintf(FAR struct lib_outstream_s *obj, FAR const char *src, va_list ap)
+{
+  FAR char        *ptmp;
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+  int             width;
+#ifdef CONFIG_LIBC_FLOATINGPOINT
+  int             trunc;
+#endif
+  uint8_t         fmt;
+#endif
+  uint8_t         flags;
+#ifdef CONFIG_ARCH_ROMGETC
+  char            ch;
+#endif
+
+  for (FMT_TOP; FMT_CHAR; FMT_BOTTOM)
+    {
+      /* Just copy regular characters */
+
+      if (FMT_CHAR != '%')
+        {
+           /* Output the character */
+
+           obj->put(obj, FMT_CHAR);
+
+           /* Flush the buffer if a newline is encountered */
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+           if (FMT_CHAR == '\n')
+             {
+               /* Should return an error on a failure to flush */
+
+               (void)obj->flush(obj);
+             }
+#endif
+           /* Process the next character in the format */
+
+           continue;
+        }
+
+      /* We have found a format specifier. Move past it. */
+
+      FMT_NEXT;
+
+      /* Assume defaults */
+
+      flags = 0;
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+      fmt   = FMT_RJUST;
+      width = 0;
+#ifdef CONFIG_LIBC_FLOATINGPOINT
+      trunc = 0;
+#endif
+#endif
+
+      /* Process each format qualifier. */
+
+      for (; FMT_CHAR; FMT_BOTTOM)
+        {
+          /* Break out of the loop when the format is known. */
+
+          if (strchr("diuxXpobeEfgGlLsc%", FMT_CHAR))
+            {
+              break;
+            }
+
+          /* Check for left justification. */
+
+          else if (FMT_CHAR == '-')
+            {
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              fmt = FMT_LJUST;
+#endif
+            }
+
+          /* Check for leading zero fill right justification. */
+
+          else if (FMT_CHAR == '0')
+            {
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              fmt = FMT_RJUST0;
+#endif
+            }
+#if 0
+          /* Center justification. */
+
+          else if (FMT_CHAR == '~')
+            {
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              fmt = FMT_CENTER;
+#endif
+            }
+#endif
+
+          else if (FMT_CHAR == '*')
+            {
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              int value = va_arg(ap, int);
+              if (IS_HASDOT(flags))
+                {
+#ifdef CONFIG_LIBC_FLOATINGPOINT
+                  trunc = value;
+                  SET_HASASTERISKTRUNC(flags);
+#endif
+                }
+              else
+                {
+                  width = value;
+                  SET_HASASTERISKWIDTH(flags);
+                }
+#endif
+            }
+
+          /* Check for field width */
+
+          else if (FMT_CHAR >= '1' && FMT_CHAR <= '9')
+            {
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+              do
+                {
+                  FMT_NEXT;
+                }
+              while (FMT_CHAR >= '0' && FMT_CHAR <= '9');
+#else
+              /* Accumulate the field width integer. */
+
+              int n = ((int)(FMT_CHAR)) - (int)'0';
+              for (;;)
+                {
+                  FMT_NEXT;
+                  if (FMT_CHAR >= '0' && FMT_CHAR <= '9')
+                    {
+                      n = 10*n + (((int)(FMT_CHAR)) - (int)'0');
+                    }
+                  else
+                    {
+                      break;
+                    }
+                }
+
+              if (IS_HASDOT(flags))
+                {
+#ifdef CONFIG_LIBC_FLOATINGPOINT
+                  trunc = n;
+#endif
+                }
+              else
+                {
+                  width = n;
+                }
+#endif
+              /* Back up to the last digit. */
+
+              FMT_PREV;
+            }
+
+          /* Check for a decimal point. */
+
+          else if (FMT_CHAR == '.')
+            {
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              SET_HASDOT(flags);
+#endif
+            }
+
+          /* Check for leading plus sign. */
+
+          else if (FMT_CHAR == '+')
+            {
+              SET_SHOWPLUS(flags);
+            }
+
+          /* Check for alternate form. */
+
+          else if (FMT_CHAR == '#')
+            {
+              SET_ALTFORM(flags);
+            }
+        }
+
+      /* "%%" means that a literal '%' was intended (instead of a format
+       * specification).
+       */
+
+      if (FMT_CHAR == '%')
+        {
+          obj->put(obj, '%');
+          continue;
+        }
+
+      /* Check for the string format. */
+
+      if (FMT_CHAR == 's')
+        {
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+          int swidth;
+#endif
+          /* Get the string to output */
+
+          ptmp = va_arg(ap, char *);
+          if (!ptmp)
+            {
+              ptmp = (char*)g_nullstring;
+            }
+
+          /* Get the widith of the string and perform right-justification
+           * operations.
+           */
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+          swidth = strlen(ptmp);
+          prejustify(obj, fmt, 0, width, swidth);
+#endif
+          /* Concatenate the string into the output */
+
+          while (*ptmp)
+            {
+              obj->put(obj, *ptmp);
+              ptmp++;
+            }
+
+          /* Perform left-justification operations. */
+
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+          postjustify(obj, fmt, 0, width, swidth);
+#endif
+          continue;
+        }
+
+      /* Check for the character output */
+
+      else if (FMT_CHAR == 'c')
+        {
+          /* Just copy the character into the output. */
+
+          int n = va_arg(ap, int);
+          obj->put(obj, n);
+          continue;
+        }
+
+      /* Check for the long long prefix. */
+
+      if (FMT_CHAR == 'L')
+        {
+           SET_LONGLONGPRECISION(flags);
+           FMT_NEXT;
+        }
+      else if (FMT_CHAR == 'l')
+        {
+          SET_LONGPRECISION(flags);
+          FMT_NEXT;
+          if (FMT_CHAR == 'l')
+            {
+              SET_LONGLONGPRECISION(flags);
+              FMT_NEXT;
+            }
+        }
+
+      /* Handle integer conversions */
+
+      if (strchr("diuxXpob", FMT_CHAR))
+        {
+#ifdef CONFIG_HAVE_LONG_LONG
+          if (IS_LONGLONGPRECISION(flags) && FMT_CHAR != 'p')
+            {
+              long long lln;
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              int lluwidth;
+#endif
+              /* Extract the long long value. */
+
+              lln = va_arg(ap, long long);
+
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+              /* Output the number */
+
+              llutoascii(obj, FMT_CHAR, flags, (unsigned long long)lln);
+#else
+              /* Resolve sign-ness and format issues */
+
+              llfixup(FMT_CHAR, &flags, &lln);
+
+              /* Get the width of the output */
+
+              lluwidth = getllusize(FMT_CHAR, flags, lln);
+
+              /* Perform left field justification actions */
+
+              prejustify(obj, fmt, flags, width, lluwidth);
+
+              /* Output the number */
+
+              llutoascii(obj, FMT_CHAR, flags, (unsigned long long)lln);
+
+              /* Perform right field justification actions */
+
+              postjustify(obj, fmt, flags, width, lluwidth);
+#endif
+            }
+          else
+#endif /* CONFIG_HAVE_LONG_LONG */
+#ifdef CONFIG_LONG_IS_NOT_INT
+          if (IS_LONGPRECISION(flags) && FMT_CHAR != 'p')
+            {
+              long ln;
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              int luwidth;
+#endif
+              /* Extract the long value. */
+
+              ln = va_arg(ap, long);
+
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+              /* Output the number */
+
+              lutoascii(obj, FMT_CHAR, flags, (unsigned long)ln);
+#else
+              /* Resolve sign-ness and format issues */
+
+              lfixup(FMT_CHAR, &flags, &ln);
+
+              /* Get the width of the output */
+
+              luwidth = getlusize(FMT_CHAR, flags, ln);
+
+              /* Perform left field justification actions */
+
+              prejustify(obj, fmt, flags, width, luwidth);
+
+              /* Output the number */
+
+              lutoascii(obj, FMT_CHAR, flags, (unsigned long)ln);
+
+              /* Perform right field justification actions */
+
+              postjustify(obj, fmt, flags, width, luwidth);
+#endif
+            }
+          else
+#endif /* CONFIG_LONG_IS_NOT_INT */
+#ifdef CONFIG_PTR_IS_NOT_INT
+          if (FMT_CHAR == 'p')
+            {
+              void *p;
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              int pwidth;
+#endif
+              /* Extract the integer value. */
+
+              p = va_arg(ap, void *);
+
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+              /* Output the pointer value */
+
+              ptohex(obj, flags, p);
+#else
+              /* Resolve sign-ness and format issues */
+
+              lfixup(FMT_CHAR, &flags, &ln);
+
+              /* Get the width of the output */
+
+              luwidth = getpsize(FMT_CHAR, flags, p);
+
+              /* Perform left field justification actions */
+
+              prejustify(obj, fmt, flags, width, pwidth);
+
+              /* Output the pointer value */
+
+              ptohex(obj, flags, p);
+
+              /* Perform right field justification actions */
+
+              postjustify(obj, fmt, flags, width, pwidth);
+#endif
+            }
+          else
+#endif
+            {
+              int n;
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+              int uwidth;
+#endif
+              /* Extract the long long value. */
+
+              n = va_arg(ap, int);
+
+#ifdef CONFIG_NOPRINTF_FIELDWIDTH
+              /* Output the number */
+
+              utoascii(obj, FMT_CHAR, flags, (unsigned int)n);
+#else
+              /* Resolve sign-ness and format issues */
+
+              fixup(FMT_CHAR, &flags, &n);
+
+              /* Get the width of the output */
+
+              uwidth = getusize(FMT_CHAR, flags, n);
+
+              /* Perform left field justification actions */
+
+              prejustify(obj, fmt, flags, width, uwidth);
+
+              /* Output the number */
+
+              utoascii(obj, FMT_CHAR, flags, (unsigned int)n);
+
+              /* Perform right field justification actions */
+
+              postjustify(obj, fmt, flags, width, uwidth);
+#endif
+            }
+        }
+
+      /* Handle floating point conversions */
+
+#ifdef CONFIG_LIBC_FLOATINGPOINT
+      else if (strchr("eEfgG", FMT_CHAR))
+        {
+#ifndef CONFIG_NOPRINTF_FIELDWIDTH
+          double dblval = va_arg(ap, double);
+          int dblsize;
+
+          /* Get the width of the output */
+
+          dblsize = getdblsize(FMT_CHAR, trunc, flags, dblval);
+
+          /* Perform left field justification actions */
+
+          prejustify(obj, fmt, 0, width, dblsize);
+
+          /* Output the number */
+
+          lib_dtoa(obj, FMT_CHAR, trunc, flags, dblval);
+
+          /* Perform right field justification actions */
+
+          postjustify(obj, fmt, 0, width, dblsize);
+#else
+          /* Output the number with a fixed precision */
+
+          double dblval = va_arg(ap, double);
+          lib_dtoa(obj, FMT_CHAR, CONFIG_LIBC_FIXEDPRECISION, flags, dblval);
+#endif
+        }
+#endif /* CONFIG_LIBC_FLOATINGPOINT */
+    }
+
+  return obj->nput;
+}
+
+
diff --git a/nuttx/lib/stdio/lib_lowinstream.c b/nuttx/lib/stdio/lib_lowinstream.c
new file mode 100644
index 000000000..499a647ea
--- /dev/null
+++ b/nuttx/lib/stdio/lib_lowinstream.c
@@ -0,0 +1,102 @@
+/****************************************************************************
+ * lib/stdio/lib_lowinstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+
+#include "lib_internal.h"
+
+#ifdef CONFIG_ARCH_LOWGETC
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lowinstream_getc
+ ****************************************************************************/
+
+static int lowinstream_getc(FAR struct lib_instream_s *this)
+{
+  int ret;
+
+  DEBUGASSERT(this);
+
+  /* Get the next character from the incoming stream */
+
+  ret = up_getc(ch)
+  if (ret != EOF)
+    {
+      this->nget++;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_lowinstream
+ *
+ * Description:
+ *   Initializes a stream for use with low-level, architecture-specific I/O.
+ *
+ * Input parameters:
+ *   lowoutstream - User allocated, uninitialized instance of struct
+ *                  lib_lowoutstream_s to be initialized.
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_lowinstream(FAR struct lib_instream_s *stream)
+{
+  stream->get  = lowinstream_getc;
+  stream->nget = 0;
+}
+
+#endif /* CONFIG_ARCH_LOWGETC */
diff --git a/nuttx/lib/stdio/lib_lowoutstream.c b/nuttx/lib/stdio/lib_lowoutstream.c
new file mode 100644
index 000000000..092f39ca2
--- /dev/null
+++ b/nuttx/lib/stdio/lib_lowoutstream.c
@@ -0,0 +1,97 @@
+/****************************************************************************
+ * lib/stdio/lib_lowoutstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifdef CONFIG_ARCH_LOWPUTC
+
+#include <stdio.h>
+#include <assert.h>
+#include <errno.h>
+#include <nuttx/arch.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lowoutstream_putc
+ ****************************************************************************/
+
+static void lowoutstream_putc(FAR struct lib_outstream_s *this, int ch)
+{
+  DEBUGASSERT(this);
+
+  if (up_putc(ch) != EOF)
+    {
+      this->nput++;
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_lowoutstream
+ *
+ * Description:
+ *   Initializes a stream for use with low-level, architecture-specific I/O.
+ *
+ * Input parameters:
+ *   lowoutstream - User allocated, uninitialized instance of struct
+ *                  lib_lowoutstream_s to be initialized.
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_lowoutstream(FAR struct lib_outstream_s *stream)
+{
+  stream->put   = lowoutstream_putc;
+#ifdef CONFIG_STDIO_LINEBUFFER
+  stream->flush = lib_noflush;
+#endif
+  stream->nput  = 0;
+}
+
+#endif /* CONFIG_ARCH_LOWPUTC */
diff --git a/nuttx/lib/stdio/lib_lowprintf.c b/nuttx/lib/stdio/lib_lowprintf.c
new file mode 100644
index 000000000..392ef2c6a
--- /dev/null
+++ b/nuttx/lib/stdio/lib_lowprintf.c
@@ -0,0 +1,128 @@
+/****************************************************************************
+ * lib/stdio/lib_lowprintf.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdio.h>
+#include <debug.h>
+#include "lib_internal.h"
+
+/* This interface can only be used from within the kernel */
+
+#if !defined(CONFIG_NUTTX_KERNEL) || defined(__KERNEL__)
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_lowvprintf
+ ****************************************************************************/
+
+#if defined(CONFIG_ARCH_LOWPUTC) || defined(CONFIG_SYSLOG)
+
+int lib_lowvprintf(const char *fmt, va_list ap)
+{
+  struct lib_outstream_s stream;
+
+  /* Wrap the stdout in a stream object and let lib_vsprintf do the work. */
+
+#ifdef CONFIG_SYSLOG
+  lib_syslogstream((FAR struct lib_outstream_s *)&stream);
+#else
+  lib_lowoutstream((FAR struct lib_outstream_s *)&stream);
+#endif
+  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
+}
+
+/****************************************************************************
+ * Name: lib_lowprintf
+ ****************************************************************************/
+
+int lib_lowprintf(const char *fmt, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, fmt);
+      ret = lib_lowvprintf(fmt, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_ARCH_LOWPUTC || CONFIG_SYSLOG */
+#endif /* __KERNEL__ */
diff --git a/nuttx/lib/stdio/lib_meminstream.c b/nuttx/lib/stdio/lib_meminstream.c
new file mode 100644
index 000000000..a842096fb
--- /dev/null
+++ b/nuttx/lib/stdio/lib_meminstream.c
@@ -0,0 +1,104 @@
+/****************************************************************************
+ * lib/stdio/lib_meminstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <assert.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: meminstream_getc
+ ****************************************************************************/
+
+static int meminstream_getc(FAR struct lib_instream_s *this)
+{
+  FAR struct lib_meminstream_s *mthis = (FAR struct lib_meminstream_s *)this;
+  int ret;
+
+  DEBUGASSERT(this);
+
+  /* Get the next character (if any) from the buffer */
+
+  if (this->nget < mthis->buflen)
+    {
+      ret = mthis->buffer[this->nget];
+      this->nget++;
+    }
+  else
+    {
+      ret = EOF;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_meminstream
+ *
+ * Description:
+ *   Initializes a stream for use with a fixed-size memory buffer.
+ *
+ * Input parameters:
+ *   meminstream - User allocated, uninitialized instance of struct
+ *                 lib_meminstream_s to be initialized.
+ *   bufstart    - Address of the beginning of the fixed-size memory buffer
+ *   buflen      - Size of the fixed-sized memory buffer in bytes
+ *
+ * Returned Value:
+ *   None (meminstream initialized).
+ *
+ ****************************************************************************/
+
+void lib_meminstream(FAR struct lib_meminstream_s *meminstream,
+                     FAR const char *bufstart, int buflen)
+{
+  meminstream->public.get  = meminstream_getc;
+  meminstream->public.nget = 0;          /* Will be buffer index */
+  meminstream->buffer      = bufstart;   /* Start of buffer */
+  meminstream->buflen      = buflen;     /* Length of the buffer */
+}
+
+
diff --git a/nuttx/lib/stdio/lib_memoutstream.c b/nuttx/lib/stdio/lib_memoutstream.c
new file mode 100644
index 000000000..21197358b
--- /dev/null
+++ b/nuttx/lib/stdio/lib_memoutstream.c
@@ -0,0 +1,105 @@
+/****************************************************************************
+ * lib/stdio/lib_memoutstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <assert.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: memoutstream_putc
+ ****************************************************************************/
+
+static void memoutstream_putc(FAR struct lib_outstream_s *this, int ch)
+{
+  FAR struct lib_memoutstream_s *mthis = (FAR struct lib_memoutstream_s *)this;
+
+  DEBUGASSERT(this);
+
+  /* If this will not overrun the buffer, then write the character to the
+   * buffer.  Not that buflen was pre-decremented when the stream was
+   * created so it is okay to write past the end of the buflen by one.
+   */
+
+  if (this->nput < mthis->buflen)
+    {
+      mthis->buffer[this->nput] = ch;
+      this->nput++;
+      mthis->buffer[this->nput] = '\0';
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_memoutstream
+ *
+ * Description:
+ *   Initializes a stream for use with a fixed-size memory buffer.
+ *
+ * Input parameters:
+ *   memoutstream - User allocated, uninitialized instance of struct
+ *                  lib_memoutstream_s to be initialized.
+ *   bufstart     - Address of the beginning of the fixed-size memory buffer
+ *   buflen       - Size of the fixed-sized memory buffer in bytes
+ *
+ * Returned Value:
+ *   None (memoutstream initialized).
+ *
+ ****************************************************************************/
+
+void lib_memoutstream(FAR struct lib_memoutstream_s *memoutstream,
+                      FAR char *bufstart, int buflen)
+{
+  memoutstream->public.put   = memoutstream_putc;
+#ifdef CONFIG_STDIO_LINEBUFFER
+  memoutstream->public.flush = lib_noflush;
+#endif
+  memoutstream->public.nput  = 0;          /* Will be buffer index */
+  memoutstream->buffer       = bufstart;   /* Start of buffer */
+  memoutstream->buflen       = buflen - 1; /* Save space for null terminator */
+  memoutstream->buffer[0]    = '\0';       /* Start with an empty string */
+}
+
+
diff --git a/nuttx/lib/stdio/lib_nullinstream.c b/nuttx/lib/stdio/lib_nullinstream.c
new file mode 100644
index 000000000..0eadb0a8e
--- /dev/null
+++ b/nuttx/lib/stdio/lib_nullinstream.c
@@ -0,0 +1,79 @@
+/****************************************************************************
+ * lib/stdio/lib_nullinstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static int nullinstream_getc(FAR struct lib_instream_s *this)
+{
+  return EOF;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_nullinstream
+ *
+ * Description:
+ *   Initializes a NULL stream. The initialized stream will  will return only
+ *   EOF.
+ *
+ * Input parameters:
+ *   nullinstream  - User allocated, uninitialized instance of struct
+ *                   lib_instream_s to be initialized.
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_nullinstream(FAR struct lib_instream_s *nullinstream)
+{
+  nullinstream->get  = nullinstream_getc;
+  nullinstream->nget = 0;
+}
+
diff --git a/nuttx/lib/stdio/lib_nulloutstream.c b/nuttx/lib/stdio/lib_nulloutstream.c
new file mode 100644
index 000000000..69878fd57
--- /dev/null
+++ b/nuttx/lib/stdio/lib_nulloutstream.c
@@ -0,0 +1,84 @@
+/****************************************************************************
+ * lib/stdio/lib_nulloutstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static void nulloutstream_putc(FAR struct lib_outstream_s *this, int ch)
+{
+  DEBUGASSERT(this);
+  this->nput++;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_nulloutstream
+ *
+ * Description:
+ *   Initializes a NULL streams. The initialized stream will write all data
+ *   to the bit-bucket.
+ *
+ * Input parameters:
+ *   nulloutstream - User allocated, uninitialized instance of struct
+ *                   lib_outstream_s to be initialized.
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_nulloutstream(FAR struct lib_outstream_s *nulloutstream)
+{
+  nulloutstream->put   = nulloutstream_putc;
+#ifdef CONFIG_STDIO_LINEBUFFER
+  nulloutstream->flush = lib_noflush;
+#endif
+  nulloutstream->nput  = 0;
+}
+
diff --git a/nuttx/lib/stdio/lib_perror.c b/nuttx/lib/stdio/lib_perror.c
new file mode 100644
index 000000000..867e113f9
--- /dev/null
+++ b/nuttx/lib/stdio/lib_perror.c
@@ -0,0 +1,99 @@
+/****************************************************************************
+ * lib/stdio/lib_perror.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* POSIX requires that perror provide its output on stderr.  This option may
+ * be defined, however, to provide perror output that is serialized with
+ * other stdout messages.
+ */
+ 
+#ifdef CONFIG_LIBC_PERROR_STDOUT
+#  define PERROR_STREAM stdout
+#else
+#  define PERROR_STREAM stderr
+#endif
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: perror
+ ****************************************************************************/
+
+void perror(FAR const char *s)
+{
+
+  /* If strerror() is not enabled, then just print the error number */
+
+#ifdef CONFIG_LIBC_STRERROR
+  (void)fprintf(PERROR_STREAM, "%s: %s\n", s, strerror(errno));
+#else
+  (void)fprintf(PERROR_STREAM, "%s: Error %d\n", s, errno);
+#endif
+}
+
diff --git a/nuttx/lib/stdio/lib_printf.c b/nuttx/lib/stdio/lib_printf.c
new file mode 100644
index 000000000..50db06c47
--- /dev/null
+++ b/nuttx/lib/stdio/lib_printf.c
@@ -0,0 +1,109 @@
+/****************************************************************************
+ * lib/stdio/lib_printf.c
+ *
+ *   Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/**************************************************************************
+ * Global Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/**************************************************************************
+ * Private Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ **************************************************************************/
+
+/****************************************************************************
+ * Name: printf
+ **************************************************************************/
+
+int printf(const char *fmt, ...)
+{
+  va_list ap;
+  int     ret;
+
+  va_start(ap, fmt);
+#if CONFIG_NFILE_STREAMS > 0
+  ret = vfprintf(stdout, fmt, ap);
+#elif CONFIG_NFILE_DESCRIPTORS > 0
+  ret = lib_rawvprintf(fmt, ap);
+#elif defined(CONFIG_ARCH_LOWPUTC)
+  ret = lib_lowvprintf(fmt, ap);
+#else
+# ifdef CONFIG_CPP_HAVE_WARNING
+#   warning "printf has no data sink"
+# endif
+  ret = 0;
+#endif
+  va_end(ap);
+
+  return ret;
+}
+
diff --git a/nuttx/lib/stdio/lib_puts.c b/nuttx/lib/stdio/lib_puts.c
new file mode 100644
index 000000000..e63a63917
--- /dev/null
+++ b/nuttx/lib/stdio/lib_puts.c
@@ -0,0 +1,130 @@
+/****************************************************************************
+ * lib/stdio/lib_puts.c
+ *
+ *   Copyright (C) 2007, 2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: puts
+ *
+ * Description:
+ *   puts() writes the string s and a trailing newline to stdout.
+ *
+ ****************************************************************************/
+
+int puts(FAR const char *s)
+{
+  FILE *stream = stdout;
+  int nwritten;
+  int nput = EOF;
+  int ret;
+
+  /* Write the string (the next two steps must be atomic) */
+
+  lib_take_semaphore(stream);
+
+  /* Write the string without its trailing '\0' */
+
+  nwritten = fputs(s, stream);
+  if (nwritten > 0)
+    {
+      /* Followed by a newline */
+
+      char newline = '\n';
+      ret = lib_fwrite(&newline, 1, stream);
+      if (ret > 0)
+        {
+          nput = nwritten + 1;
+
+          /* Flush the buffer after the newline is output. */
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+          ret = lib_fflush(stream, true);
+          if (ret < 0)
+            {
+              nput = EOF;
+            }
+#endif
+        }
+    }
+
+  lib_give_semaphore(stdout);
+  return nput;
+}
+
diff --git a/nuttx/lib/stdio/lib_rawinstream.c b/nuttx/lib/stdio/lib_rawinstream.c
new file mode 100644
index 000000000..9671a2716
--- /dev/null
+++ b/nuttx/lib/stdio/lib_rawinstream.c
@@ -0,0 +1,107 @@
+/****************************************************************************
+ * lib/stdio/lib_rawinstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: rawinstream_getc
+ ****************************************************************************/
+
+static int rawinstream_getc(FAR struct lib_instream_s *this)
+{
+  FAR struct lib_rawinstream_s *rthis = (FAR struct lib_rawinstream_s *)this;
+  int nwritten;
+  char ch;
+
+  DEBUGASSERT(this && rthis->fd >= 0);
+
+  /* Attempt to read one character */
+
+  nwritten = read(rthis->fd, &ch, 1);
+  if (nwritten == 1)
+    {
+      this->nget++;
+      return ch;
+    }
+
+  /* Return EOF on any failure to read from the incoming byte stream. The
+   * only expected error is EINTR meaning that the read was interrupted
+   * by a signal.  A Zero return value would indicated an end-of-file
+   * confition.
+   */
+
+  return EOF;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_rawinstream
+ *
+ * Description:
+ *   Initializes a stream for use with a file descriptor.
+ *
+ * Input parameters:
+ *   rawinstream - User allocated, uninitialized instance of struct
+ *                 lib_rawinstream_s to be initialized.
+ *   fd          - User provided file/socket descriptor (must have been opened
+ *                 for the correct access).
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_rawinstream(FAR struct lib_rawinstream_s *rawinstream, int fd)
+{
+  rawinstream->public.get  = rawinstream_getc;
+  rawinstream->public.nget = 0;
+  rawinstream->fd          = fd;
+}
+
diff --git a/nuttx/lib/stdio/lib_rawoutstream.c b/nuttx/lib/stdio/lib_rawoutstream.c
new file mode 100644
index 000000000..ed813f87a
--- /dev/null
+++ b/nuttx/lib/stdio/lib_rawoutstream.c
@@ -0,0 +1,115 @@
+/****************************************************************************
+ * lib/stdio/lib_rawoutstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: rawoutstream_putc
+ ****************************************************************************/
+
+static void rawoutstream_putc(FAR struct lib_outstream_s *this, int ch)
+{
+  FAR struct lib_rawoutstream_s *rthis = (FAR struct lib_rawoutstream_s *)this;
+  int nwritten;
+  char buffer = ch;
+
+  DEBUGASSERT(this && rthis->fd >= 0);
+
+  /* Loop until the character is successfully transferred or until an
+   * irrecoverable error occurs.
+   */
+
+  do
+    {
+      nwritten = write(rthis->fd, &buffer, 1);
+      if (nwritten == 1)
+        {
+          this->nput++;
+          return;
+        }
+
+      /* The only expected error is EINTR, meaning that the write operation
+       * was awakened by a signal.  Zero would not be a valid return value
+       * from write().
+       */
+
+      DEBUGASSERT(nwritten < 0);
+    }
+  while (get_errno() == EINTR);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_rawoutstream
+ *
+ * Description:
+ *   Initializes a stream for use with a file descriptor.
+ *
+ * Input parameters:
+ *   rawoutstream - User allocated, uninitialized instance of struct
+ *                  lib_rawoutstream_s to be initialized.
+ *   fd           - User provided file/socket descriptor (must have been opened
+ *                  for write access).
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_rawoutstream(FAR struct lib_rawoutstream_s *rawoutstream, int fd)
+{
+  rawoutstream->public.put   = rawoutstream_putc;
+#ifdef CONFIG_STDIO_LINEBUFFER
+  rawoutstream->public.flush = lib_noflush;
+#endif
+  rawoutstream->public.nput  = 0;
+  rawoutstream->fd           = fd;
+}
+
diff --git a/nuttx/lib/stdio/lib_rawprintf.c b/nuttx/lib/stdio/lib_rawprintf.c
new file mode 100644
index 000000000..19dfa895e
--- /dev/null
+++ b/nuttx/lib/stdio/lib_rawprintf.c
@@ -0,0 +1,151 @@
+/****************************************************************************
+ * lib/stdio/lib_rawprintf.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <debug.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Some output destinations are only available from within the kernel */
+
+#if defined(CONFIG_NUTTX_KERNEL) && !defined(__KERNEL__)
+#  undef CONFIG_SYSLOG
+#  undef CONFIG_ARCH_LOWPUTC
+#endif
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_rawvprintf
+ ****************************************************************************/
+
+int lib_rawvprintf(const char *fmt, va_list ap)
+{
+#if defined(CONFIG_SYSLOG)
+
+  struct lib_outstream_s stream;
+
+  /* Wrap the low-level output in a stream object and let lib_vsprintf
+   * do the work.
+   */
+
+  lib_syslogstream((FAR struct lib_outstream_s *)&stream);
+  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
+
+#elif CONFIG_NFILE_DESCRIPTORS > 0
+
+  struct lib_rawoutstream_s rawoutstream;
+
+  /* Wrap the stdout in a stream object and let lib_vsprintf
+   * do the work.
+   */
+
+  lib_rawoutstream(&rawoutstream, 1);
+  return lib_vsprintf(&rawoutstream.public, fmt, ap);
+
+#elif defined(CONFIG_ARCH_LOWPUTC)
+
+  struct lib_outstream_s stream;
+
+  /* Wrap the low-level output in a stream object and let lib_vsprintf
+   * do the work.
+   */
+
+  lib_lowoutstream((FAR struct lib_outstream_s *)&stream);
+  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
+
+#else
+  return 0;
+#endif
+}
+
+/****************************************************************************
+ * Name: lib_rawprintf
+ ****************************************************************************/
+
+int lib_rawprintf(const char *fmt, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, fmt);
+      ret = lib_rawvprintf(fmt, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
diff --git a/nuttx/lib/stdio/lib_rdflush.c b/nuttx/lib/stdio/lib_rdflush.c
new file mode 100644
index 000000000..35c5495c1
--- /dev/null
+++ b/nuttx/lib/stdio/lib_rdflush.c
@@ -0,0 +1,144 @@
+/****************************************************************************
+ * lib/stdio/lib_rdflush.c
+ *
+ *   Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_rdflush
+ *
+ * Description:
+ *   Flush read data from the I/O buffer and adjust the file pointer to
+ *   account for the unread data
+ *
+ ****************************************************************************/
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+int lib_rdflush(FAR FILE *stream)
+{
+  if (!stream)
+    {
+      set_errno(EBADF);
+      return ERROR;
+    }
+
+  /* Get exclusive access to the stream */
+
+  lib_take_semaphore(stream);
+
+  /* If the buffer is currently being used for read access, then discard all
+   * of the read-ahead data.  We do not support concurrent buffered read/write
+   * access.
+   */
+
+  if (stream->fs_bufread != stream->fs_bufstart)
+    {
+      /* Now adjust the stream pointer to account for the read-ahead data that
+       * was not actually read by the user.
+       */
+
+#if CONFIG_NUNGET_CHARS > 0
+      off_t rdoffset = stream->fs_bufread - stream->fs_bufpos + stream->fs_nungotten;
+#else
+      off_t rdoffset = stream->fs_bufread - stream->fs_bufpos;
+#endif
+      /* Mark the buffer as empty (do this before calling fseek() because fseek()
+       * also calls this function).
+       */
+
+      stream->fs_bufpos = stream->fs_bufread = stream->fs_bufstart;
+#if CONFIG_NUNGET_CHARS > 0
+      stream->fs_nungotten = 0;
+#endif
+      /* Then seek to the position corresponding to the last data read by the user */
+
+      if (fseek(stream, -rdoffset, SEEK_CUR) < 0)
+        {
+          lib_give_semaphore(stream);
+          return ERROR;
+        }
+    }
+
+  lib_give_semaphore(stream);
+  return OK;
+}
+#endif /* CONFIG_STDIO_BUFFER_SIZE */
+
diff --git a/nuttx/lib/stdio/lib_snprintf.c b/nuttx/lib/stdio/lib_snprintf.c
new file mode 100644
index 000000000..e5ce7b0f0
--- /dev/null
+++ b/nuttx/lib/stdio/lib_snprintf.c
@@ -0,0 +1,99 @@
+/****************************************************************************
+ * lib/stdio/lib_snprintf.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * sprintf
+ ****************************************************************************/
+
+int snprintf(FAR char *buf, size_t size, const char *format, ...)
+{
+  struct lib_memoutstream_s memoutstream;
+  va_list ap;
+  int     n;
+
+  /* Initialize a memory stream to write to the buffer */
+
+  lib_memoutstream((FAR struct lib_memoutstream_s *)&memoutstream, buf, size);
+
+  /* Then let lib_vsprintf do the real work */
+
+  va_start(ap, format);
+  n = lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public, format, ap);
+  va_end(ap);
+  return n;
+}
diff --git a/nuttx/lib/stdio/lib_sprintf.c b/nuttx/lib/stdio/lib_sprintf.c
new file mode 100644
index 000000000..89fd61033
--- /dev/null
+++ b/nuttx/lib/stdio/lib_sprintf.c
@@ -0,0 +1,95 @@
+/****************************************************************************
+ * lib/stdio/lib_sprintf.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * sprintf
+ ****************************************************************************/
+
+int sprintf (FAR char *buf, const char *fmt, ...)
+{
+  struct lib_memoutstream_s memoutstream;
+  va_list ap;
+  int     n;
+
+  /* Initialize a memory stream to write to the buffer */
+
+  lib_memoutstream((FAR struct lib_memoutstream_s *)&memoutstream, buf, LIB_BUFLEN_UNKNOWN);
+
+  /* Then let lib_vsprintf do the real work */
+
+  va_start(ap, fmt);
+  n = lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public, fmt, ap);
+  va_end(ap);
+  return n;
+}
diff --git a/nuttx/lib/stdio/lib_sscanf.c b/nuttx/lib/stdio/lib_sscanf.c
new file mode 100644
index 000000000..7e1fae276
--- /dev/null
+++ b/nuttx/lib/stdio/lib_sscanf.c
@@ -0,0 +1,507 @@
+/****************************************************************************
+ * lib/stdio/lib_sscanf.c
+ *
+ *   Copyright (C) 2007, 2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+
+#include <sys/types.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <ctype.h>
+#include <debug.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#define MAXLN 128
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+int vsscanf(char *buf, const char *fmt, va_list ap);
+
+/**************************************************************************
+ * Global Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/**************************************************************************
+ * Private Constant Data
+ **************************************************************************/
+
+static const char spaces[] = " \t\n\r\f\v";
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  findwidth
+ *
+ * Description:
+ *    Try to figure out the width of the input data.
+ *
+ ****************************************************************************/
+
+static int findwidth(FAR const char *buf, FAR const char *fmt)
+{
+  FAR const char *next = fmt + 1;
+
+  /* No... is there a space after the format? Or does the format string end
+   * here?
+   */
+
+  if (isspace(*next) || *next == 0)
+    {
+      /* Use the input up until the first white space is encountered. */
+
+      return strcspn(buf, spaces);
+    }
+
+  /* No.. Another possibility is the the format character is followed by
+   * some recognizable delimiting value.
+   */
+
+  if (*next != '%')
+    {
+      /* If so we will say that the string ends there if we can find that
+       * delimiter in the input string.
+       */
+
+      FAR const char *ptr = strchr(buf, *next);
+      if (ptr)
+        {
+          return (int)(ptr - buf);
+        }
+    }
+
+  /* No... the format has not delimiter and is back-to-back with the next
+   * formats (or no is following by a delimiter that does not exist in the
+   * input string).  At this point we just bail and Use the input up until
+   * the first white space is encountered.
+   *
+   * NOTE:  This means that values from the following format may be
+   * concatenated with the first. This is a bug.  We have no generic way of
+   * determining the width of the data if there is no fieldwith, no space
+   * separating the input, and no usable delimiter character.
+   */
+
+  return strcspn(buf, spaces);
+}
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  sscanf
+ *
+ * Description:
+ *    ANSI standard sscanf implementation.
+ *
+ ****************************************************************************/
+
+int sscanf(FAR const char *buf, FAR const char *fmt, ...)
+{
+  va_list ap;
+  int     count;
+
+  va_start(ap, fmt);
+  count = vsscanf((FAR char*)buf, fmt, ap);
+  va_end(ap);
+  return count;
+}
+
+/****************************************************************************
+ * Function:  vsscanf
+ *
+ * Description:
+ *    ANSI standard vsscanf implementation.
+ *
+ ****************************************************************************/
+
+int vsscanf(FAR char *buf, FAR const char *fmt, va_list ap)
+{
+  FAR char       *bufstart;
+  FAR char       *tv;
+  FAR const char *tc;
+  bool            lflag;
+  bool            noassign;
+  int             count;
+  int             width;
+  int             base = 10;
+  char            tmp[MAXLN];
+
+  lvdbg("vsscanf: buf=\"%s\" fmt=\"%s\"\n", buf, fmt);
+
+  /* Remember the start of the input buffer.  We will need this for %n
+   * calculations.
+   */
+
+  bufstart = buf;
+
+  /* Parse the format, extracting values from the input buffer as needed */
+
+  count    = 0;
+  width    = 0;
+  noassign = false;
+  lflag    = false;
+
+  while (*fmt && *buf)
+    {
+      /* Skip over white space */
+
+      while (isspace(*fmt))
+        {
+          fmt++;
+        }
+
+      /* Check for a conversion specifier */
+
+      if (*fmt == '%')
+        {
+          lvdbg("vsscanf: Specifier found\n");
+
+          /* Check for qualifiers on the conversion specifier */
+          fmt++;
+          for (; *fmt; fmt++)
+            {
+              lvdbg("vsscanf: Processing %c\n", *fmt);
+
+              if (strchr("dibouxcsefgn%", *fmt))
+                {
+                  break;
+                }
+
+              if (*fmt == '*')
+                {
+                  noassign = true;
+                }
+              else if (*fmt == 'l' || *fmt == 'L')
+                {
+                  /* NOTE: Missing check for long long ('ll') */
+
+                  lflag = true;
+                }
+              else if (*fmt >= '1' && *fmt <= '9')
+                {
+                  for (tc = fmt; isdigit(*fmt); fmt++);
+                  strncpy(tmp, tc, fmt - tc);
+                  tmp[fmt - tc] = '\0';
+                  width = atoi(tmp);
+                  fmt--;
+                }
+            }
+
+          /* Process %s:  String conversion */
+
+          if (*fmt == 's')
+            {
+              lvdbg("vsscanf: Performing string conversion\n");
+
+              while (isspace(*buf))
+                {
+                  buf++;
+                }
+
+              /* Was a fieldwidth specified? */
+
+              if (!width)
+                {
+                  /* No... Guess a field width using some heuristics */
+
+                  width = findwidth(buf, fmt);
+                }
+
+              if (!noassign)
+                {
+                  tv = va_arg(ap, char*);
+                  strncpy(tv, buf, width);
+                  tv[width] = '\0';
+                }
+
+              buf += width;
+            }
+
+          /* Process %c:  Character conversion */
+
+          else if (*fmt == 'c')
+            {
+              lvdbg("vsscanf: Performing character conversion\n");
+
+              /* Was a fieldwidth specified? */
+
+              if (!width)
+                {
+                  /* No, then width is this one single character */
+
+                  width = 1;
+                }
+
+              if (!noassign)
+                {
+                  tv = va_arg(ap, char*);
+                  strncpy(tv, buf, width);
+                  tv[width] = '\0';
+                }
+
+              buf += width;
+            }
+
+          /* Process %d, %o, %b, %x, %u:  Various integer conversions */
+
+          else if (strchr("dobxu", *fmt))
+            {
+              lvdbg("vsscanf: Performing integer conversion\n");
+
+              /* Skip over any white space before the integer string */
+
+              while (isspace(*buf))
+                {
+                  buf++;
+                }
+
+              /* The base of the integer conversion depends on the specific
+               * conversion specification.
+               */
+
+              if (*fmt == 'd' || *fmt == 'u')
+                {
+                  base = 10;
+                }
+              else if (*fmt == 'x')
+                {
+                  base = 16;
+                }
+              else if (*fmt == 'o')
+                {
+                  base = 8;
+                }
+              else if (*fmt == 'b')
+                {
+                  base = 2;
+                }
+
+              /* Was a fieldwidth specified? */
+
+              if (!width)
+                {
+                  /* No... Guess a field width using some heuristics */
+
+                  width = findwidth(buf, fmt);
+                }
+
+              /* Copy the numeric string into a temporary working buffer. */
+
+              strncpy(tmp, buf, width);
+              tmp[width] = '\0';
+
+              lvdbg("vsscanf: tmp[]=\"%s\"\n", tmp);
+
+              /* Perform the integer conversion */
+
+              buf += width;
+              if (!noassign)
+                {
+#ifdef SDCC
+                  char *endptr;
+                  long tmplong = strtol(tmp, &endptr, base);
+#else
+                  long tmplong = strtol(tmp, NULL, base);
+#endif
+                  if (lflag)
+                    {
+                      long *plong = va_arg(ap, long*);
+                      lvdbg("vsscanf: Return %ld to 0x%p\n", tmplong, plong);
+                      *plong = tmplong;
+                    }
+                  else
+                    {
+                      int *pint = va_arg(ap, int*);
+                      lvdbg("vsscanf: Return %ld to 0x%p\n", tmplong, pint);
+                      *pint = (int)tmplong;
+                    }
+                }
+            }
+
+          /* Process %f:  Floating point conversion */
+
+          else if (*fmt == 'f')
+            {
+#ifndef CONFIG_LIBC_FLOATINGPOINT
+              /* No floating point conversions */
+
+              void *pv = va_arg(ap, void*);
+
+              lvdbg("vsscanf: Return 0.0 to %p\n", pv);
+              *((double_t*)pv) = 0.0;
+#else
+              lvdbg("vsscanf: Performing floating point conversion\n");
+
+              /* Skip over any white space before the real string */
+
+              while (isspace(*buf))
+                {
+                  buf++;
+                }
+
+              /* Was a fieldwidth specified? */
+
+              if (!width)
+                {
+                  /* No... Guess a field width using some heuristics */
+
+                  width = findwidth(buf, fmt);
+                }
+
+              /* Copy the real string into a temporary working buffer. */
+
+              strncpy(tmp, buf, width);
+              tmp[width] = '\0';
+              buf += width;
+
+              lvdbg("vsscanf: tmp[]=\"%s\"\n", tmp);
+
+              /* Perform the floating point conversion */
+
+              if (!noassign)
+                {
+                  /* strtod always returns a double */
+#ifdef SDCC
+                  char *endptr;
+                  double_t dvalue = strtod(tmp,&endptr);
+#else
+                  double_t dvalue = strtod(tmp, NULL);
+#endif
+                  void *pv = va_arg(ap, void*);
+
+                  lvdbg("vsscanf: Return %f to %p\n", dvalue, pv);
+
+                  /* But we have to check whether we need to return a
+                   * float or a double.
+                   */
+
+#ifdef CONFIG_HAVE_DOUBLE
+                  if (lflag)
+                    {
+                      *((double_t*)pv) = dvalue;
+                    }
+                  else
+#endif
+                    {
+                      *((float*)pv) = (float)dvalue;
+                    }
+                }
+#endif
+            }
+
+          /* Process %n:  Character count */
+
+          else if (*fmt == 'n')
+            {
+              lvdbg("vsscanf: Performing character count\n");
+
+              if (!noassign)
+                {
+                  size_t nchars = (size_t)(buf - bufstart);
+
+                  if (lflag)
+                    {
+                      long *plong = va_arg(ap, long*);
+                      *plong = (long)nchars;
+                    }
+                  else
+                    {
+                      int *pint = va_arg(ap, int*);
+                      *pint = (int)nchars;
+                    }
+                }
+            }
+
+          /* Note %n does not count as a conversion */
+
+          if (!noassign && *fmt != 'n')
+            {
+              count++;
+            }
+
+          width    = 0;
+          noassign = false;
+          lflag    = false;
+
+          fmt++;
+        }
+
+    /* Its is not a conversion specifier */
+
+      else
+        {
+          while (isspace(*buf))
+            {
+              buf++;
+            }
+
+          if (*fmt != *buf)
+            {
+              break;
+            }
+          else
+            {
+              fmt++;
+              buf++;
+            }
+        }
+    }
+
+  return count;
+}
diff --git a/nuttx/lib/stdio/lib_stdinstream.c b/nuttx/lib/stdio/lib_stdinstream.c
new file mode 100644
index 000000000..77aab9ec8
--- /dev/null
+++ b/nuttx/lib/stdio/lib_stdinstream.c
@@ -0,0 +1,99 @@
+/****************************************************************************
+ * lib/stdio/lib_stdinstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <assert.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stdinstream_getc
+ ****************************************************************************/
+
+static int stdinstream_getc(FAR struct lib_instream_s *this)
+{
+  FAR struct lib_stdinstream_s *sthis = (FAR struct lib_stdinstream_s *)this;
+  int ret;
+
+  DEBUGASSERT(this);
+
+  /* Get the next character from the incoming stream */
+
+  ret = getc(sthis->stream);
+  if (ret != EOF)
+    {
+      this->nget++;
+    }
+ 
+ return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_stdinstream
+ *
+ * Description:
+ *   Initializes a stream for use with a FILE instance.
+ *
+ * Input parameters:
+ *   stdinstream - User allocated, uninitialized instance of struct
+ *                 lib_stdinstream_s to be initialized.
+ *   stream      - User provided stream instance (must have been opened for
+ *                 read access).
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_stdinstream(FAR struct lib_stdinstream_s *stdinstream,
+                     FAR FILE *stream)
+{
+  stdinstream->public.get  = stdinstream_getc;
+  stdinstream->public.nget = 0;
+  stdinstream->stream      = stream;
+}
+
+
diff --git a/nuttx/lib/stdio/lib_stdoutstream.c b/nuttx/lib/stdio/lib_stdoutstream.c
new file mode 100644
index 000000000..20da5b702
--- /dev/null
+++ b/nuttx/lib/stdio/lib_stdoutstream.c
@@ -0,0 +1,147 @@
+/****************************************************************************
+ * lib/stdio/lib_stdoutstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <fcntl.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stdoutstream_putc
+ ****************************************************************************/
+
+static void stdoutstream_putc(FAR struct lib_outstream_s *this, int ch)
+{
+  FAR struct lib_stdoutstream_s *sthis = (FAR struct lib_stdoutstream_s *)this;
+  int result;
+
+  DEBUGASSERT(this && sthis->stream);
+
+  /* Loop until the character is successfully transferred or an irrecoverable
+   * error occurs.
+   */
+
+  do
+    {
+      result = fputc(ch, sthis->stream);
+      if (result != EOF)
+        {
+          this->nput++;
+          return;
+        }
+
+      /* EINTR (meaning that fputc was interrupted by a signal) is the only
+       * recoverable error.
+       */
+    }
+  while (get_errno() == EINTR);
+}
+
+/****************************************************************************
+ * Name: stdoutstream_flush
+ ****************************************************************************/
+
+#if defined(CONFIG_STDIO_LINEBUFFER) && CONFIG_STDIO_BUFFER_SIZE > 0
+int stdoutstream_flush(FAR struct lib_outstream_s *this)
+{
+  FAR struct lib_stdoutstream_s *sthis = (FAR struct lib_stdoutstream_s *)this;
+  return lib_fflush(sthis->stream, true);
+}
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_stdoutstream
+ *
+ * Description:
+ *   Initializes a stream for use with a FILE instance.
+ *
+ * Input parameters:
+ *   stdoutstream - User allocated, uninitialized instance of struct
+ *                  lib_stdoutstream_s to be initialized.
+ *   stream       - User provided stream instance (must have been opened for
+ *                  write access).
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_stdoutstream(FAR struct lib_stdoutstream_s *stdoutstream,
+                   FAR FILE *stream)
+{
+  /* Select the put operation */
+
+  stdoutstream->public.put   = stdoutstream_putc;
+
+  /* Select the correct flush operation.  This flush is only called when
+   * a newline is encountered in the output stream.  However, we do not
+   * want to support this line buffering behavior if the stream was
+   * opened in binary mode.  In binary mode, the newline has no special
+   * meaning.
+   */
+
+#ifdef CONFIG_STDIO_LINEBUFFER
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+  if ((stream->fs_oflags & O_BINARY) == 0)
+    {
+      stdoutstream->public.flush = stdoutstream_flush;
+    }
+  else
+#endif
+    {
+      stdoutstream->public.flush = lib_noflush;
+    }
+#endif
+
+  /* Set the number of bytes put to zero and remember the stream */
+
+  stdoutstream->public.nput  = 0;
+  stdoutstream->stream       = stream;
+}
+
+
diff --git a/nuttx/lib/stdio/lib_syslogstream.c b/nuttx/lib/stdio/lib_syslogstream.c
new file mode 100644
index 000000000..21151b43a
--- /dev/null
+++ b/nuttx/lib/stdio/lib_syslogstream.c
@@ -0,0 +1,122 @@
+/****************************************************************************
+ * lib/stdio/lib_syslogstream.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <nuttx/syslog.h>
+
+#include "lib_internal.h"
+
+#ifdef CONFIG_SYSLOG
+
+/****************************************************************************
+ * Pre-processor definition
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: syslogstream_putc
+ ****************************************************************************/
+
+static void syslogstream_putc(FAR struct lib_outstream_s *this, int ch)
+{
+  int ret;
+
+  /* Try writing until the write was successful or until an irrecoverable
+   * error occurs.
+   */
+
+  do
+    {
+      /* Write the character to the supported logging device */
+
+      ret = syslog_putc(ch);
+      if (ret == OK)
+        {
+          this->nput++;
+          return;
+        }
+
+      /* On failure syslog_putc will return a negated errno value.  The
+       * errno variable will not be set.  The special value -EINTR means that
+       * syslog_putc() was awakened by a signal.  This is not a real error and
+       * must be ignored in this context.
+       */
+    }
+  while (ret == -EINTR);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_syslogstream
+ *
+ * Description:
+ *   Initializes a stream for use with the configured syslog interface.
+ *
+ * Input parameters:
+ *   lowoutstream - User allocated, uninitialized instance of struct
+ *                  lib_lowoutstream_s to be initialized.
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_syslogstream(FAR struct lib_outstream_s *stream)
+{
+  stream->put   = syslogstream_putc;
+#ifdef CONFIG_STDIO_LINEBUFFER
+  stream->flush = lib_noflush;
+#endif
+  stream->nput  = 0;
+}
+
+#endif /* CONFIG_SYSLOG */
+
+
diff --git a/nuttx/lib/stdio/lib_ungetc.c b/nuttx/lib/stdio/lib_ungetc.c
new file mode 100644
index 000000000..c10d4fba1
--- /dev/null
+++ b/nuttx/lib/stdio/lib_ungetc.c
@@ -0,0 +1,121 @@
+/****************************************************************************
+ * lib/stdio/lib_ungetc.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <nuttx/fs/fs.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/**************************************************************************
+ * Global Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/**************************************************************************
+ * Private Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ **************************************************************************/
+
+/****************************************************************************
+ * Name: ungetc
+ **************************************************************************/
+
+int ungetc(int c, FAR FILE *stream)
+{
+#if CONFIG_NUNGET_CHARS > 0
+  int nungotten;
+#endif
+
+  /* Stream must be open for read access */
+
+  if ((stream && stream->fs_filedes < 0) ||
+      ((stream->fs_oflags & O_RDOK) == 0))
+    {
+      set_errno(EBADF);
+      return EOF;
+    }
+
+#if CONFIG_NUNGET_CHARS > 0
+  nungotten = stream->fs_nungotten;
+  if (stream->fs_nungotten < CONFIG_NUNGET_CHARS)
+    {
+      stream->fs_ungotten[nungotten] = c;
+      stream->fs_nungotten = nungotten + 1;
+      return c;
+    }
+  else
+#endif
+    {
+      set_errno(ENOMEM);
+      return EOF;
+    }
+}
+
diff --git a/nuttx/lib/stdio/lib_vfprintf.c b/nuttx/lib/stdio/lib_vfprintf.c
new file mode 100644
index 000000000..1c3a2d7fc
--- /dev/null
+++ b/nuttx/lib/stdio/lib_vfprintf.c
@@ -0,0 +1,102 @@
+/****************************************************************************
+ * lib/stdio/lib_vfprintf.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <semaphore.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int vfprintf(FAR FILE *stream, FAR const char *fmt, va_list ap)
+{
+  struct lib_stdoutstream_s stdoutstream;
+  int  n = ERROR;
+
+  if (stream)
+    {
+      /* Wrap the stream in a stream object and let lib_vsprintf
+       * do the work.
+       */
+
+      lib_stdoutstream(&stdoutstream, stream);
+
+      /* Hold the stream semaphore throughout the lib_vsprintf
+       * call so that this thread can get its entire message out
+       * before being pre-empted by the next thread.
+       */
+
+      lib_take_semaphore(stream);
+      n = lib_vsprintf(&stdoutstream.public, fmt, ap);
+      lib_give_semaphore(stream);
+    }
+  return n;
+}
diff --git a/nuttx/lib/stdio/lib_vprintf.c b/nuttx/lib/stdio/lib_vprintf.c
new file mode 100644
index 000000000..d085d5886
--- /dev/null
+++ b/nuttx/lib/stdio/lib_vprintf.c
@@ -0,0 +1,92 @@
+/****************************************************************************
+ * lib/stdio/lib_vprintf.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/**************************************************************************
+ * Global Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/**************************************************************************
+ * Private Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ **************************************************************************/
+
+/****************************************************************************
+ * Name: vprintf
+ **************************************************************************/
+
+int vprintf(FAR const char *fmt, va_list ap)
+{
+  /* vfprintf into stdout */
+
+  return vfprintf(stdout, fmt, ap);
+}
+
diff --git a/nuttx/lib/stdio/lib_vsnprintf.c b/nuttx/lib/stdio/lib_vsnprintf.c
new file mode 100644
index 000000000..c6f52092d
--- /dev/null
+++ b/nuttx/lib/stdio/lib_vsnprintf.c
@@ -0,0 +1,96 @@
+/****************************************************************************
+ * lib/stdio/lib_vsnprintf.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: vsnprintf
+ ****************************************************************************/
+
+int vsnprintf(FAR char *buf, size_t size, const char *format, va_list ap)
+{
+  struct lib_memoutstream_s memoutstream;
+  int     n;
+
+  /* Initialize a memory stream to write to the buffer */
+
+  lib_memoutstream((FAR struct lib_memoutstream_s *)&memoutstream, buf, size);
+
+  /* Then let lib_vsprintf do the real work */
+
+  n = lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public, format, ap);
+  return n;
+}
diff --git a/nuttx/lib/stdio/lib_vsprintf.c b/nuttx/lib/stdio/lib_vsprintf.c
new file mode 100644
index 000000000..5db46664e
--- /dev/null
+++ b/nuttx/lib/stdio/lib_vsprintf.c
@@ -0,0 +1,92 @@
+/****************************************************************************
+ * lib/stdio/lib_vsprintf.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: vsprintf
+ ****************************************************************************/
+
+int vsprintf(FAR char *dest, const char *src, va_list ap)
+{
+  struct lib_memoutstream_s memoutstream;
+
+  /* Wrap the destination buffer in a stream object and let
+   * lib/stdio/lib_vsprintf do the work.
+   */
+
+  lib_memoutstream((FAR struct lib_memoutstream_s *)&memoutstream, dest, LIB_BUFLEN_UNKNOWN);
+  return lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public, src, ap);
+}
diff --git a/nuttx/lib/stdio/lib_wrflush.c b/nuttx/lib/stdio/lib_wrflush.c
new file mode 100644
index 000000000..39680da6a
--- /dev/null
+++ b/nuttx/lib/stdio/lib_wrflush.c
@@ -0,0 +1,134 @@
+/****************************************************************************
+ * lib/stdio/lib_wrflush.c
+ *
+ *   Copyright (C) 2008-2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_wrflush
+ *
+ * Description:
+ *   This is simply a version of fflush that does not report an error if
+ *   the file is not open for writing.
+ *
+ ****************************************************************************/
+
+int lib_wrflush(FAR FILE *stream)
+{
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+  /* Verify that we were passed a valid (i.e., non-NULL) stream */
+
+#ifdef CONFIG_DEBUG
+  if (!stream)
+    {
+      return -EINVAL;
+    }
+#endif
+
+  /* Verify that the stream is opened for writing... lib_fflush will
+   * return an error if it is called for a stream that is not opened for
+   * writing.  Check that first so that this function will not fail in
+   * that case.
+   */
+
+  if ((stream->fs_oflags & O_WROK) == 0)
+    {
+      /* Report that the success was successful if we attempt to flush a
+       * read-only stream.
+       */
+
+      return OK;
+    }
+
+  /* Flush the stream.   Return success if there is no buffered write data
+   * -- i.e., that the stream is opened for writing and  that all of the
+   * buffered write data was successfully flushed by lib_fflush().
+   */
+
+  return lib_fflush(stream, true);
+#else
+  /* Verify that we were passed a valid (i.e., non-NULL) stream */
+
+#ifdef CONFIG_DEBUG
+  if (!stream)
+    {
+      return -EINVAL;
+    }
+#endif
+
+  return OK;
+#endif
+}
diff --git a/nuttx/lib/stdio/lib_zeroinstream.c b/nuttx/lib/stdio/lib_zeroinstream.c
new file mode 100644
index 000000000..39a6c22ef
--- /dev/null
+++ b/nuttx/lib/stdio/lib_zeroinstream.c
@@ -0,0 +1,79 @@
+/****************************************************************************
+ * lib/stdio/lib_zeroinstream.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <errno.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static int zeroinstream_getc(FAR struct lib_instream_s *this)
+{
+  this->nget++;
+  return 0;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_zeroinstream
+ *
+ * Description:
+ *   Initializes a NULL stream.  The initialized stream will return an
+ *   infinitely long stream of zeroes.
+ *
+ * Input parameters:
+ *   zeroinstream  - User allocated, uninitialized instance of struct
+ *                   lib_instream_s to be initialized.
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_zeroinstream(FAR struct lib_instream_s *zeroinstream)
+{
+  zeroinstream->get  = zeroinstream_getc;
+  zeroinstream->nget = 0;
+}
+
diff --git a/nuttx/lib/stdlib/Make.defs b/nuttx/lib/stdlib/Make.defs
new file mode 100644
index 000000000..76e285808
--- /dev/null
+++ b/nuttx/lib/stdlib/Make.defs
@@ -0,0 +1,44 @@
+############################################################################
+# lib/stdlib/Make.defs
+#
+#   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the stdlib C files to the build
+
+CSRCS += lib_abs.c lib_abort.c lib_imaxabs.c lib_labs.c lib_llabs.c \
+		  lib_rand.c lib_qsort.c
+
+# Add the stdlib directory to the build
+
+DEPPATH += --dep-path stdlib
+VPATH += :stdlib
diff --git a/nuttx/lib/stdlib/lib_abort.c b/nuttx/lib/stdlib/lib_abort.c
new file mode 100644
index 000000000..84b600950
--- /dev/null
+++ b/nuttx/lib/stdlib/lib_abort.c
@@ -0,0 +1,121 @@
+/************************************************************************
+ * lib/stdlib/lib_abort.c
+ *
+ *   Copyright (C) 2007, 2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdlib.h>
+#include <pthread.h>
+
+/************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Function Prototypes
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: Abort
+ *
+ * Description:
+ *   The abort() first unblocks the SIGABRT signal, and then raises that
+ *   signal for the calling process. This results in the abnormal
+ *   termination of the process unless the SIGABRT signal is caught and
+ *   the signal handler does not return.
+ *
+ *   If the abort() function causes process termination, all open
+ *   streams are closed and flushed.
+ *
+ *   If the SIGABRT signal is ignored, or caught by a handler that
+ *   returns, the abort() function will still terminate the process.
+ *   It does this by restoring the default disposition for SIGABRT and
+ *   then raising the signal for a second time.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *  This function does not return,
+ *
+ ************************************************************************/
+
+void abort(void)
+{
+  /* NuttX does not support standard signal functionality (like the
+   * behavior of the SIGABRT signal).  So no attempt is made to provide
+   * a conformant version of abort() at this time.  This version does not
+   * signal the calling thread all.
+   *
+   * Note that pthread_exit() is called instead of exit().  That is because
+   * we do no know if abort was called from a pthread or a normal thread
+   * (we could find out, of course).  If abort() is called from a non-pthread,
+   * then pthread_exit() should fail and fall back to call exit() anyway.
+   *
+   * If exit() is called (either below or via pthread_exit()), then exit()
+   * will flush and close all open files and terminate the thread.  If this
+   * function was called from a pthread, then pthread_exit() will complete
+   * any joins, but will not flush or close any streams.
+   */
+
+#ifdef CONFIG_DISABLE_PTHREAD
+  exit(EXIT_FAILURE);
+#else
+  pthread_exit(NULL);
+#endif
+}
diff --git a/nuttx/lib/stdlib/lib_abs.c b/nuttx/lib/stdlib/lib_abs.c
new file mode 100644
index 000000000..1a0c1671c
--- /dev/null
+++ b/nuttx/lib/stdlib/lib_abs.c
@@ -0,0 +1,54 @@
+/************************************************************************
+ * lib/stdlib/lib_abs.c
+ *
+ *   Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdlib.h>
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+int abs(int j)
+{
+  if (j < 0)
+    {
+      j = -j;
+    }
+  return j;
+}
diff --git a/nuttx/lib/stdlib/lib_imaxabs.c b/nuttx/lib/stdlib/lib_imaxabs.c
new file mode 100644
index 000000000..c6e227c7d
--- /dev/null
+++ b/nuttx/lib/stdlib/lib_imaxabs.c
@@ -0,0 +1,54 @@
+/************************************************************************
+ * lib/stdlib//lib_abs.c
+ *
+ *   Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <inttypes.h>
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+intmax_t imaxabs(intmax_t j)
+{
+  if (j < 0)
+    {
+      j = -j;
+    }
+  return j;
+}
diff --git a/nuttx/lib/stdlib/lib_labs.c b/nuttx/lib/stdlib/lib_labs.c
new file mode 100644
index 000000000..f7218ee83
--- /dev/null
+++ b/nuttx/lib/stdlib/lib_labs.c
@@ -0,0 +1,54 @@
+/************************************************************************
+ * lib/stdlib/lib_labs.c
+ *
+ *   Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdlib.h>
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+long int labs(long int j)
+{
+  if (j < 0)
+    {
+      j = -j;
+    }
+  return j;
+}
diff --git a/nuttx/lib/stdlib/lib_llabs.c b/nuttx/lib/stdlib/lib_llabs.c
new file mode 100644
index 000000000..db7d3dbe0
--- /dev/null
+++ b/nuttx/lib/stdlib/lib_llabs.c
@@ -0,0 +1,57 @@
+/************************************************************************
+ * lib/stdlib/lib_llabs.c
+ *
+ *   Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+#include <stdlib.h>
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_LONG_LONG
+long long int llabs(long long int j)
+{
+  if (j < 0)
+    {
+      j = -j;
+    }
+  return j;
+}
+#endif
diff --git a/nuttx/lib/stdlib/lib_qsort.c b/nuttx/lib/stdlib/lib_qsort.c
new file mode 100644
index 000000000..9dd5c0040
--- /dev/null
+++ b/nuttx/lib/stdlib/lib_qsort.c
@@ -0,0 +1,238 @@
+/****************************************************************************
+ * lib/stdlib/lib_qsort.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Leveraged from:
+ *
+ *  Copyright (c) 1992, 1993
+ *  The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    This product includes software developed by the University of
+ *    California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdlib.h>
+
+/****************************************************************************
+ * Preprocessor Definitions
+ ****************************************************************************/
+
+#define min(a, b)  (a) < (b) ? a : b
+
+#define swapcode(TYPE, parmi, parmj, n) \
+  { \
+    long i = (n) / sizeof (TYPE); \
+    register TYPE *pi = (TYPE *) (parmi); \
+    register TYPE *pj = (TYPE *) (parmj); \
+    do { \
+      register TYPE  t = *pi; \
+      *pi++ = *pj; \
+      *pj++ = t; \
+    } while (--i > 0); \
+  }
+
+#define SWAPINIT(a, size) \
+  swaptype = ((char *)a - (char *)0) % sizeof(long) || \
+  size % sizeof(long) ? 2 : size == sizeof(long)? 0 : 1;
+
+#define swap(a, b) \
+  if (swaptype == 0) \
+    { \
+      long t = *(long *)(a); \
+      *(long *)(a) = *(long *)(b); \
+      *(long *)(b) = t; \
+    } \
+  else \
+    { \
+      swapfunc(a, b, size, swaptype); \
+    }
+
+#define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n, swaptype)
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static inline void swapfunc(char *a, char *b, int n, int swaptype);
+static inline char *med3(char *a, char *b, char *c,
+                         int (*compar)(const void *, const void *));
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static inline void swapfunc(char *a, char *b, int n, int swaptype)
+{
+  if(swaptype <= 1)
+    {
+      swapcode(long, a, b, n)
+    }
+  else
+    {
+      swapcode(char, a, b, n)
+    }
+}
+
+static inline char *med3(char *a, char *b, char *c,
+                         int (*compar)(const void *, const void *))
+{
+  return compar(a, b) < 0 ?
+         (compar(b, c) < 0 ? b : (compar(a, c) < 0 ? c : a ))
+              :(compar(b, c) > 0 ? b : (compar(a, c) < 0 ? a : c ));
+}
+
+/****************************************************************************
+ * Public Function
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: qsort
+ *
+ * Description:
+ *   Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
+ *
+ ****************************************************************************/
+
+void qsort(void *base, size_t nmemb, size_t size,
+           int(*compar)(const void *, const void *))
+{
+  char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
+  int d, r, swaptype, swap_cnt;
+
+loop:
+  SWAPINIT(base, size);
+  swap_cnt = 0;
+  if (nmemb < 7)
+    {
+      for (pm = (char *) base + size; pm < (char *) base + nmemb * size; pm += size)
+        {
+          for (pl = pm; pl > (char *) base && compar(pl - size, pl) > 0; pl -= size)
+            {
+              swap(pl, pl - size);
+            }
+        }
+      return;
+  }
+
+  pm = (char *) base + (nmemb / 2) * size;
+  if (nmemb > 7)
+    {
+      pl = base;
+      pn = (char *) base + (nmemb - 1) * size;
+      if (nmemb > 40)
+        {
+          d = (nmemb / 8) * size;
+          pl = med3(pl, pl + d, pl + 2 * d, compar);
+          pm = med3(pm - d, pm, pm + d, compar);
+          pn = med3(pn - 2 * d, pn - d, pn, compar);
+        }
+      pm = med3(pl, pm, pn, compar);
+    }
+  swap(base, pm);
+  pa = pb = (char *) base + size;
+
+  pc = pd = (char *) base + (nmemb - 1) * size;
+  for (;;)
+    {
+      while (pb <= pc && (r = compar(pb, base)) <= 0)
+        {
+          if (r == 0)
+            {
+              swap_cnt = 1;
+              swap(pa, pb);
+              pa += size;
+            }
+          pb += size;
+        }
+      while (pb <= pc && (r = compar(pc, base)) >= 0)
+        {
+          if (r == 0)
+            {
+              swap_cnt = 1;
+              swap(pc, pd);
+              pd -= size;
+            }
+          pc -= size;
+        }
+
+      if (pb > pc)
+        {
+          break;
+        }
+
+      swap(pb, pc);
+      swap_cnt = 1;
+      pb += size;
+      pc -= size;
+    }
+
+  if (swap_cnt == 0)
+    {
+      /* Switch to insertion sort */
+
+      for (pm = (char *) base + size; pm < (char *) base + nmemb * size; pm += size)
+        {
+          for (pl = pm; pl > (char *) base && compar(pl - size, pl) > 0; pl -= size)
+            {
+              swap(pl, pl - size);
+            }
+        }
+      return;
+    }
+
+  pn = (char *) base + nmemb * size;
+  r = min(pa - (char *)base, pb - pa);
+  vecswap(base, pb - r, r);
+  r = min(pd - pc, pn - pd - size);
+  vecswap(pb, pn - r, r);
+
+  if ((r = pb - pa) > size)
+    {
+      qsort(base, r / size, size, compar);
+    }
+
+  if ((r = pd - pc) > size)
+    {
+      /* Iterate rather than recurse to save stack space */
+      base = pn - r;
+      nmemb = r / size;
+      goto loop;
+    }
+}
+
diff --git a/nuttx/lib/stdlib/lib_rand.c b/nuttx/lib/stdlib/lib_rand.c
new file mode 100644
index 000000000..7227c52d0
--- /dev/null
+++ b/nuttx/lib/stdlib/lib_rand.c
@@ -0,0 +1,220 @@
+/************************************************************
+ * lib/stdlib/lib_rand.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <sys/types.h>
+#include <stdlib.h>
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+#ifndef CONFIG_LIB_RAND_ORDER
+#define CONFIG_LIB_RAND_ORDER 1
+#endif
+
+/* Values needed by the random number generator */
+
+#define RND1_CONSTK  470001
+#define RND1_CONSTP  999563
+#define RND2_CONSTK1 366528
+#define RND2_CONSTK2 508531
+#define RND2_CONSTP  998917
+#define RND3_CONSTK1 360137
+#define RND3_CONSTK2 519815
+#define RND3_CONSTK3 616087
+#define RND3_CONSTP  997783
+
+#if CONFIG_LIB_RAND_ORDER == 1
+# define RND_CONSTP RND1_CONSTP
+#elif CONFIG_LIB_RAND_ORDER == 2
+# define RND_CONSTP RND2_CONSTP
+#else
+# define RND_CONSTP RND3_CONSTP
+#endif
+
+/************************************************************
+ * Private Type Declarations
+ ************************************************************/
+
+/************************************************************
+ * Private Function Prototypes
+ ************************************************************/
+
+static unsigned int nrand(unsigned int nLimit);
+static double_t frand1(void);
+#if (CONFIG_LIB_RAND_ORDER > 1)
+static double_t frand2(void);
+#if (CONFIG_LIB_RAND_ORDER > 2)
+static double_t frand3(void);
+#endif
+#endif
+
+/**********************************************************
+ * Global Constant Data
+ **********************************************************/
+
+/************************************************************
+ * Global Variables
+ ************************************************************/
+
+/**********************************************************
+ * Private Constant Data
+ **********************************************************/
+
+/************************************************************
+ * Private Variables
+ ************************************************************/
+
+static unsigned long g_nRandInt1;
+#if (CONFIG_LIB_RAND_ORDER > 1)
+static unsigned long g_nRandInt2;
+#if (CONFIG_LIB_RAND_ORDER > 2)
+static unsigned long g_nRandInt3;
+#endif
+#endif
+
+/************************************************************
+ * Private Functions
+ ************************************************************/
+ 
+static unsigned int nrand(unsigned int nLimit)
+{
+  unsigned long nResult;
+  double_t fRatio;
+
+  /* Loop to be sure a legal random number is generated */
+  do {
+
+    /* Get a random integer in the requested range */
+#if (CONFIG_LIB_RAND_ORDER == 1)
+    fRatio = frand1();
+#elif (CONFIG_LIB_RAND_ORDER == 2)
+    fRatio = frand2();
+#else
+    fRatio = frand3();
+#endif
+
+    /* Then, produce the return-able value */
+    nResult = (unsigned long)(((double_t)nLimit) * fRatio);
+
+  } while (nResult >= (unsigned long)nLimit);
+
+  return (unsigned int)nResult;
+
+} /* end nrand */
+
+static double_t frand1(void)
+{
+  unsigned long nRandInt;
+
+  /* First order congruential generator */
+  nRandInt = (RND1_CONSTK * g_nRandInt1) % RND1_CONSTP;
+  g_nRandInt1 = nRandInt;
+
+  /* Construct an floating point value in the range from 0.0 up to 1.0 */
+  return ((double_t)nRandInt) / ((double_t)RND_CONSTP);
+
+} /* end frand */
+
+#if (CONFIG_LIB_RAND_ORDER > 1)
+static double_t frand2(void)
+{
+  unsigned long nRandInt;
+
+  /* Second order congruential generator */
+  nRandInt = (RND2_CONSTK1 * g_nRandInt1 + RND2_CONSTK2 * g_nRandInt2) %
+    RND2_CONSTP;
+  g_nRandInt2 = g_nRandInt1;
+  g_nRandInt1 = nRandInt;
+
+  /* Construct an floating point value in the range from 0.0 up to 1.0 */
+  return ((double_t)nRandInt) / ((double_t)RND_CONSTP);
+
+} /* end frand */
+
+#if (CONFIG_LIB_RAND_ORDER > 2)
+static double_t frand3(void)
+{
+  unsigned long nRandInt;
+
+  /* Third order congruential generator */
+  nRandInt = (RND3_CONSTK1 * g_nRandInt1 + RND3_CONSTK2 * g_nRandInt2 +
+	      RND3_CONSTK2 * g_nRandInt3) % RND3_CONSTP;
+  g_nRandInt3 = g_nRandInt2;
+  g_nRandInt2 = g_nRandInt1;
+  g_nRandInt1 = nRandInt;
+
+  /* Construct an floating point value in the range from 0.0 up to 1.0 */
+  return ((double_t)nRandInt) / ((double_t)RND_CONSTP);
+
+} /* end frand */
+#endif
+#endif
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+/************************************************************
+ * Function:  srand, rand
+ ************************************************************/
+
+void srand(unsigned int seed)
+{
+  g_nRandInt1 = seed;
+#if (CONFIG_LIB_RAND_ORDER > 1)
+  g_nRandInt2 = seed;
+  (void)frand1();
+#if (CONFIG_LIB_RAND_ORDER > 2)
+  g_nRandInt3 = seed;
+  (void)frand2();
+#endif
+#endif
+
+} /* end srand */
+
+int rand(void)
+{
+  return (int)nrand(32768);
+
+} /* end rand */
+
diff --git a/nuttx/lib/string/Make.defs b/nuttx/lib/string/Make.defs
new file mode 100644
index 000000000..191b9ffea
--- /dev/null
+++ b/nuttx/lib/string/Make.defs
@@ -0,0 +1,58 @@
+############################################################################
+# lib/string/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the string C files to the build
+
+CSRCS += lib_checkbase.c lib_isbasedigit.c lib_memset.c lib_memchr.c \
+		 lib_memccpy.c lib_memcmp.c lib_memmove.c lib_skipspace.c \
+		 lib_strcasecmp.c lib_strcat.c lib_strchr.c lib_strcpy.c lib_strcmp.c \
+		 lib_strcspn.c lib_strdup.c lib_strerror.c lib_strlen.c lib_strnlen.c \
+		 lib_strncasecmp.c lib_strncat.c lib_strncmp.c lib_strncpy.c \
+		 lib_strndup.c lib_strcasestr.c lib_strpbrk.c lib_strrchr.c\
+		 lib_strspn.c lib_strstr.c lib_strtok.c lib_strtokr.c lib_strtol.c \
+		 lib_strtoll.c lib_strtoul.c lib_strtoull.c lib_strtod.c
+
+ifneq ($(CONFIG_ARCH_MEMCPY),y)
+ifeq ($(CONFIG_MEMCPY_VIK),y)
+CSRCS += lib_vikmemcpy.c
+else
+CSRCS += lib_memcpy.c
+endif
+endif
+
+# Add the string directory to the build
+
+DEPPATH += --dep-path string
+VPATH += :string
diff --git a/nuttx/lib/string/lib_checkbase.c b/nuttx/lib/string/lib_checkbase.c
new file mode 100644
index 000000000..bc79ab2ce
--- /dev/null
+++ b/nuttx/lib/string/lib_checkbase.c
@@ -0,0 +1,115 @@
+/****************************************************************************
+ * lib/string/lib_checkbase.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <ctype.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_checkbase
+ *
+ * Description:
+ *   This is part of the strol() family implementation.  This function checks
+ *   the initial part of a string to see if it can determine the numeric
+ *   base that is represented.
+ *
+ * Assumptions:
+ *   *ptr points to the first, non-whitespace character in the string.
+ *
+ ****************************************************************************/
+ 
+int lib_checkbase(int base, const char **pptr)
+{
+   const char *ptr = *pptr;
+
+  /* Check for unspecified base */
+
+  if (!base)
+    {
+      /* Assume base 10 */
+
+      base = 10;
+
+      /* Check for leading '0' - that would signify octal or hex (or binary) */
+
+      if (*ptr == '0')
+        {
+          /* Assume octal */
+
+          base = 8;
+          ptr++;
+
+          /* Check for hexidecimal */
+
+          if ((*ptr == 'X' || *ptr == 'x') && 
+              lib_isbasedigit(ptr[1], 16, NULL))
+            {
+              base = 16;
+              ptr++;
+            }
+        }
+    }
+
+  /* If it a hexidecimal representation, than discard any leading "0X" or "0x" */
+
+  else if (base == 16)
+    {
+      if (ptr[0] == '0' && (ptr[1] == 'X' || ptr[1] == 'x'))
+        {
+          ptr += 2;
+        }
+    }
+
+  /* Return the updated pointer and base */
+
+  *pptr = ptr;
+  return base;
+}
+
diff --git a/nuttx/lib/string/lib_isbasedigit.c b/nuttx/lib/string/lib_isbasedigit.c
new file mode 100644
index 000000000..a2421bf2a
--- /dev/null
+++ b/nuttx/lib/string/lib_isbasedigit.c
@@ -0,0 +1,105 @@
+/****************************************************************************
+ * lib/string/lib_isbasedigit.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_isbasedigit
+ *
+ * Description:
+ *   Given an ASCII character, ch, and a base (1-36) do two
+ *   things:  1) Determine if ch is a valid charcter, and 2)
+ *   convert ch to its binary value.
+ *
+ ****************************************************************************/
+
+bool lib_isbasedigit(int ch, int base, int *value)
+{
+  bool ret = false;
+  int  tmp = 0;
+
+  if (base <= 10)
+    {
+      if (ch >= '0' && ch <= base + '0' - 1)
+        {
+          tmp = ch - '0';
+          ret = true;
+        }
+    }
+  else if (base <= 36)
+    {
+      if (ch >= '0' && ch <= '9')
+        {
+          tmp = ch - '0';
+          ret = true;
+        }
+      else if (ch >= 'a' && ch <= 'a' + base - 11)
+        {
+          tmp = ch - 'a' + 10;
+          ret = true;
+        }
+      else if (ch >= 'A' && ch <= 'A' + base - 11)
+        {
+          tmp = ch - 'A' + 10;
+          ret = true;
+        }
+    }
+
+  if (value)
+    {
+      *value = tmp;
+    }
+  return ret;
+}
+
+
diff --git a/nuttx/lib/string/lib_memccpy.c b/nuttx/lib/string/lib_memccpy.c
new file mode 100644
index 000000000..1f3dbb52d
--- /dev/null
+++ b/nuttx/lib/string/lib_memccpy.c
@@ -0,0 +1,99 @@
+/****************************************************************************
+ * lib/string/lib_memccpy.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+
+/****************************************************************************
+ * Name: memccpy
+ *
+ * Description:
+ *   The memccpy() function copies bytes from memory area s2 into s1,
+ *   stopping after the first occurrence of byte c (converted to an unsigned
+ *   char) is copied, or after n bytes are copied, whichever comes first. If
+ *   copying takes place between objects that overlap, the behavior is
+ *   undefined.
+ *
+ * Returned Value:
+ *   The memccpy() function returns a pointer to the byte after the copy of c
+ *   in s1, or a null pointer if c was not found in the first n bytes of s2.
+ *
+ ****************************************************************************/
+
+FAR void *memccpy(FAR void *s1, FAR const void *s2, int c, size_t n)
+{
+  FAR unsigned char *pout = (FAR unsigned char*)s1;
+  FAR unsigned char *pin  = (FAR unsigned char*)s2;
+
+  /* Copy at most n bytes */
+
+  while (n-- > 0)
+    {
+      /* Copy one byte */
+
+      *pout = *pin++;
+
+      /* Did we just copy the terminating byte c? */
+
+      if (*pout == (unsigned char)c)
+        {
+          /* Yes return a pointer to the byte after the copy of c into s1 */
+
+          return (FAR void *)pout;
+        }
+
+      /* No increment to the next destination location */
+
+      pout++;
+    }
+
+  /* C was not found in the first n bytes of s2 */
+
+  return NULL;
+}
diff --git a/nuttx/lib/string/lib_memchr.c b/nuttx/lib/string/lib_memchr.c
new file mode 100644
index 000000000..e0dec8270
--- /dev/null
+++ b/nuttx/lib/string/lib_memchr.c
@@ -0,0 +1,80 @@
+/****************************************************************************
+ * lib/string/lib_memchr.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: memchr
+ *
+ * Description:
+ *   The memchr() function locates the first occurrence of 'c' (converted to
+ *   an unsigned char) in the initial 'n' bytes (each interpreted as
+ *   unsigned char) of the object pointed to by s.
+ *
+ * Returned Value:
+ *   The memchr() function returns a pointer to the located byte, or a null
+ *   pointer if the byte does not occur in the object.
+ *
+ ****************************************************************************/
+
+FAR void *memchr(FAR const void *s, int c, size_t n)
+{
+  FAR const unsigned char *p = (FAR const unsigned char *)s;
+
+  if (s)
+    {
+      while (n--)
+        {
+          if (*p == (unsigned char)c)
+            {
+              return (FAR void *)p;
+            }
+
+          p++;
+        }
+    }
+
+  return NULL;
+}
diff --git a/nuttx/lib/string/lib_memcmp.c b/nuttx/lib/string/lib_memcmp.c
new file mode 100644
index 000000000..eb2e1fd12
--- /dev/null
+++ b/nuttx/lib/string/lib_memcmp.c
@@ -0,0 +1,74 @@
+/************************************************************
+ * lib/string/lib_memcmp.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+#ifndef CONFIG_ARCH_MEMCMP
+int memcmp(const void *s1, const void *s2, size_t n)
+{
+  unsigned char *p1 = (unsigned char *)s1;
+  unsigned char *p2 = (unsigned char *)s2;
+
+  while (n-- > 0)
+    {
+      if (*p1 < *p2)
+        {
+          return -1;
+        }
+      else if (*p1 > *p2)
+        {
+          return 1;
+        }
+
+      p1++;
+      p2++;
+    }
+  return 0;
+}
+#endif
diff --git a/nuttx/lib/string/lib_memcpy.c b/nuttx/lib/string/lib_memcpy.c
new file mode 100644
index 000000000..3b62edbab
--- /dev/null
+++ b/nuttx/lib/string/lib_memcpy.c
@@ -0,0 +1,64 @@
+/****************************************************************************
+ * lib/string/lib_memcpy.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: memcpy
+ ****************************************************************************/
+
+#ifndef CONFIG_ARCH_MEMCPY
+FAR void *memcpy(FAR void *dest, FAR const void *src, size_t n)
+{
+  FAR unsigned char *pout = (FAR unsigned char*)dest;
+  FAR unsigned char *pin  = (FAR unsigned char*)src;
+  while (n-- > 0) *pout++ = *pin++;
+  return dest;
+}
+#endif
diff --git a/nuttx/lib/string/lib_memmove.c b/nuttx/lib/string/lib_memmove.c
new file mode 100644
index 000000000..85cb79e17
--- /dev/null
+++ b/nuttx/lib/string/lib_memmove.c
@@ -0,0 +1,77 @@
+/************************************************************
+ * lib/string/lib_memmove.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+#ifndef CONFIG_ARCH_MEMMOVE
+void *memmove(void *dest, const void *src, size_t count)
+{
+  char *tmp, *s;
+  if (dest <= src)
+    {
+      tmp = (char*) dest;
+      s   = (char*) src;
+      while (count--)
+        {
+	  *tmp++ = *s++;
+        }
+    }
+  else
+    {
+      tmp = (char*) dest + count;
+      s   = (char*) src + count;
+      while (count--)
+        {
+	  *--tmp = *--s;
+        }
+    }
+
+  return dest;
+}
+#endif
diff --git a/nuttx/lib/string/lib_memset.c b/nuttx/lib/string/lib_memset.c
new file mode 100644
index 000000000..31c386e92
--- /dev/null
+++ b/nuttx/lib/string/lib_memset.c
@@ -0,0 +1,188 @@
+
+/****************************************************************************
+ * lib/string/lib_memset.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Can't support CONFIG_MEMSET_64BIT if the platform does not have 64-bit
+ * integer types.
+ */
+
+#ifndef CONFIG_HAVE_LONG_LONG
+#  undef CONFIG_MEMSET_64BIT
+#endif
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+#ifndef CONFIG_ARCH_MEMSET
+void *memset(void *s, int c, size_t n)
+{
+#ifdef CONFIG_MEMSET_OPTSPEED
+  /* This version is optimized for speed (you could do better
+   * still by exploiting processor caching or memory burst
+   * knowledge.)
+   */
+
+  uintptr_t addr  = (uintptr_t)s;
+  uint16_t  val16 = ((uint16_t)c << 8) | (uint16_t)c;
+  uint32_t  val32 = ((uint32_t)val16 << 16) | (uint32_t)val16;
+#ifdef CONFIG_MEMSET_64BIT
+  uint64_t  val64 = ((uint64_t)val32 << 32) | (uint64_t)val32;
+#endif
+
+  /* Make sure that there is something to be cleared */
+
+  if (n > 0)
+    {
+      /* Align to a 16-bit boundary */
+
+      if ((addr & 1) != 0)
+        {
+          *(uint8_t*)addr = (uint8_t)c;
+          addr += 1;
+          n    -= 1;
+        }
+
+      /* Check if there are at least 16-bits left to be written */
+
+      if (n >= 2)
+        {
+          /* Align to a 32-bit boundary (we know that the destination
+           * address is already aligned to at least a 16-bit boundary).
+           */
+
+          if ((addr & 3) != 0)
+            {
+              *(uint16_t*)addr = val16;
+              addr += 2;
+              n    -= 2;
+            }
+
+#ifndef CONFIG_MEMSET_64BIT
+          /* Loop while there are at least 32-bits left to be written */
+
+          while (n >= 4)
+            {
+              *(uint32_t*)addr = val32;
+              addr += 4;
+              n    -= 4;
+            }
+#else
+          /* Check if there are at least 32-bits left to be written */
+
+          if (n >= 4)
+            {
+              /* Align to a 64-bit boundary (we know that the destination
+               * address is already aligned to at least a 32-bit boundary).
+               */
+
+              if ((addr & 7) != 0)
+                {
+                  *(uint32_t*)addr = val32;
+                  addr += 4;
+                  n    -= 4;
+                }
+
+              /* Loop while there are at least 64-bits left to be written */
+
+              while (n >= 8)
+                {
+                  *(uint64_t*)addr = val64;
+                  addr += 8;
+                  n    -= 8;
+                }
+            }
+#endif
+        }
+
+#ifdef CONFIG_MEMSET_64BIT
+      /* We may get here with n in the range 0..7.  If n >= 4, then we should
+       * have 64-bit alignment.
+       */
+
+      if (n >= 4)
+        {
+          *(uint32_t*)addr = val32;
+          addr += 4;
+          n    -= 4;
+        }
+#endif
+
+      /* We may get here under the following conditions:
+       *
+       *   n = 0, addr may or may not be aligned
+       *   n = 1, addr is aligned to at least a 16-bit boundary
+       *   n = 2, addr is aligned to a 32-bit boundary
+       *   n = 3, addr is aligned to a 32-bit boundary
+       */
+
+      if (n >= 2)
+        {
+          *(uint16_t*)addr = val16;
+          addr += 2;
+          n    -= 2;
+        }
+
+      if (n >= 1)
+        {
+          *(uint8_t*)addr = (uint8_t)c;
+        }
+    }
+#else
+  /* This version is optimized for size */
+
+  unsigned char *p = (unsigned char*)s;
+  while (n-- > 0) *p++ = c;
+#endif
+  return s;
+}
+#endif
diff --git a/nuttx/lib/string/lib_skipspace.c b/nuttx/lib/string/lib_skipspace.c
new file mode 100644
index 000000000..b4e6588e5
--- /dev/null
+++ b/nuttx/lib/string/lib_skipspace.c
@@ -0,0 +1,69 @@
+/****************************************************************************
+ * lib/string/lib_skipspace.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <ctype.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_skipspace
+ *
+ * Description:
+ *   Skip over leading whitespace
+ *
+ ****************************************************************************/
+
+void lib_skipspace(const char **pptr)
+{
+   const char *ptr = *pptr;
+   while (isspace(*ptr)) ptr++;
+   *pptr = ptr;
+}
+
+
diff --git a/nuttx/lib/string/lib_strcasecmp.c b/nuttx/lib/string/lib_strcasecmp.c
new file mode 100644
index 000000000..d4aa8cc03
--- /dev/null
+++ b/nuttx/lib/string/lib_strcasecmp.c
@@ -0,0 +1,65 @@
+/****************************************************************************
+ * lib/string/lib_strcasecmp.c
+ *
+ *   Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ *****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <ctype.h>
+
+/****************************************************************************
+ * Public Functions
+ *****************************************************************************/
+
+#ifndef CONFIG_ARCH_STRCMP
+int strcasecmp(const char *cs, const char *ct)
+{
+  int result;
+  for (;;)
+    {
+      if ((result = (int)toupper(*cs) - (int)toupper(*ct)) != 0 || !*cs)
+        {
+          break;
+        }
+
+      cs++;
+      ct++;
+    }
+  return result;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strcasestr.c b/nuttx/lib/string/lib_strcasestr.c
new file mode 100644
index 000000000..23f0ab57e
--- /dev/null
+++ b/nuttx/lib/string/lib_strcasestr.c
@@ -0,0 +1,134 @@
+/****************************************************************************
+ * lib/string/lib_strstr.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use str source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions str binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer str
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <ctype.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static FAR char *strcasechr(FAR const char *s, int uc)
+{
+  register char ch;
+
+  if (s)
+    {
+      for (; *s; s++)
+        {
+          ch = *s;
+          if (toupper(ch) == uc)
+            {
+              return (FAR char*)s;
+            }
+        }
+    }
+
+  return NULL;
+}
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+FAR char *strcasestr(FAR const char *str, FAR const char *substr)
+{
+  const char *candidate;  /* Candidate in str with matching start character */
+  char         ch;        /* First character of the substring */
+  int          len;       /* The length of the substring */
+
+  /* Special case the empty substring */
+
+  len = strlen(substr);
+  ch  = *substr;
+
+  if (!ch)
+    {
+      /* We'll say that an empty substring matches at the beginning of
+       * the string
+       */
+
+      return (char*)str;
+    }
+
+  /* Search for the substring */
+
+  candidate = str;
+  ch        = toupper(ch);
+
+  for (;;)
+    {
+      /* strcasechr() will return a pointer to the next occurrence of the
+       * character ch in the string (ignoring case)
+       */
+
+      candidate = strcasechr(candidate, ch);
+      if (!candidate || strlen(candidate) < len)
+        {
+           /* First character of the substring does not appear in the string
+            * or the remainder of the string is not long enough to contain the
+            * substring.
+            */
+
+           return NULL;
+        }
+
+      /* Check if this is the beginning of a matching substring (ignoring case) */
+
+      if (strncasecmp(candidate, substr, len) == 0)
+        {
+           /* Yes.. return the pointer to the first occurrence of the matching
+            * substring.
+            */
+
+           return (char*)candidate;
+        }
+
+      /* No, find the next candidate after this one */
+
+      candidate++;
+    }
+
+  /* Won't get here, but some compilers might complain */
+
+  return NULL;
+}
+
diff --git a/nuttx/lib/string/lib_strcat.c b/nuttx/lib/string/lib_strcat.c
new file mode 100644
index 000000000..20350fec0
--- /dev/null
+++ b/nuttx/lib/string/lib_strcat.c
@@ -0,0 +1,62 @@
+/****************************************************************************
+ * lib/string/lib_strcat.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+#ifndef CONFIG_ARCH_STRCAT
+char *strcat(char *dest, const char *src)
+{
+  char *ret   = dest;
+
+  dest  += strlen(dest);
+  while (*src != '\0')
+    {
+      *dest++ = *src++;
+    }
+  *dest = '\0';
+
+  return ret;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strchr.c b/nuttx/lib/string/lib_strchr.c
new file mode 100644
index 000000000..d0bd22a0e
--- /dev/null
+++ b/nuttx/lib/string/lib_strchr.c
@@ -0,0 +1,78 @@
+/****************************************************************************
+ * lib/string/lib_strchr.c
+ *
+ *   Copyright (C) 2007, 2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strchr
+ *
+ * Description:
+ *   The strchr() function locates the first occurrence of 'c' (converted to
+ *   a char) in the string pointed to by 's'. The terminating null byte is
+ *   considered to be part of the string.
+ *
+ * Returned Value:
+ *   Upon completion, strchr() returns a pointer to the byte, or a null
+ *   pointer if the byte was not found.
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_ARCH_STRCHR
+FAR char *strchr(FAR const char *s, int c)
+{
+  if (s)
+    {
+      for (; *s; s++)
+        {
+          if (*s == c)
+            {
+              return (FAR char *)s;
+            }
+        }
+    }
+
+  return NULL;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strcmp.c b/nuttx/lib/string/lib_strcmp.c
new file mode 100644
index 000000000..0e3eee890
--- /dev/null
+++ b/nuttx/lib/string/lib_strcmp.c
@@ -0,0 +1,59 @@
+/****************************************************************************
+ * lib/string/lib_strcmp.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ *****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/****************************************************************************
+ * Public Functions
+ *****************************************************************************/
+
+#ifndef CONFIG_ARCH_STRCMP
+int strcmp(const char *cs, const char *ct)
+{
+  register signed char result;
+  for (;;)
+    {
+      if ((result = *cs - *ct++) != 0 || !*cs++)
+	break;
+    }
+  return result;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strcpy.c b/nuttx/lib/string/lib_strcpy.c
new file mode 100644
index 000000000..e2f70b94e
--- /dev/null
+++ b/nuttx/lib/string/lib_strcpy.c
@@ -0,0 +1,55 @@
+/************************************************************************
+ * lib/string/lib_strcpy.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+#ifndef CONFIG_ARCH_STRCPY
+char *strcpy(char *dest, const char *src)
+{
+  char *tmp = dest;
+  while ((*dest++ = *src++) != '\0');
+  return tmp;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strcspn.c b/nuttx/lib/string/lib_strcspn.c
new file mode 100644
index 000000000..9da89241c
--- /dev/null
+++ b/nuttx/lib/string/lib_strcspn.c
@@ -0,0 +1,67 @@
+/****************************************************************************
+ * lib/string/lib_strcspn.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strcspn
+ *
+ * Description:
+ *  strspn() calculates the length of the initial segment of s which
+ *  consists entirely of characters not in reject
+ *
+ ****************************************************************************/
+
+size_t strcspn(const char *s, const char *reject)
+{
+  size_t i;
+  for (i = 0; s[i] && strchr(reject, s[i]) == NULL; i++);
+  return i;
+}
+
diff --git a/nuttx/lib/string/lib_strdup.c b/nuttx/lib/string/lib_strdup.c
new file mode 100644
index 000000000..44a0cbc0d
--- /dev/null
+++ b/nuttx/lib/string/lib_strdup.c
@@ -0,0 +1,62 @@
+/************************************************************************
+ * lib/string//lib_strdup.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+#include "lib_internal.h"
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+FAR char *strdup(const char *s)
+{
+  FAR char *news = NULL;
+  if (s)
+    {
+      news = (FAR char*)lib_malloc(strlen(s) + 1);
+      if (news)
+        {
+          strcpy(news, s);
+        }
+    }
+  return news;
+}
diff --git a/nuttx/lib/string/lib_strerror.c b/nuttx/lib/string/lib_strerror.c
new file mode 100644
index 000000000..249f695c1
--- /dev/null
+++ b/nuttx/lib/string/lib_strerror.c
@@ -0,0 +1,375 @@
+/************************************************************************
+ * lib/string/lib_strerror.c
+ *
+ *   Copyright (C) 2007, 2009, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Types
+ ************************************************************************/
+
+struct errno_strmap_s
+{
+  uint8_t     errnum;
+  const char *str;
+};
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+#ifdef CONFIG_LIBC_STRERROR
+
+/* This table maps all error numbers to descriptive strings.
+ * The only assumption that the code makes with regard to this
+ * this table is that it is ordered by error number.
+ *
+ * The size of this table is quite large.  Its size can be
+ * reduced by eliminating some of the more obscure error
+ * strings.
+ */
+
+#ifndef CONFIG_LIBC_STRERROR_SHORT
+
+static const struct errno_strmap_s g_errnomap[] =
+{
+  { EPERM,               EPERM_STR           },
+  { ENOENT,              ENOENT_STR          },
+  { ESRCH,               ESRCH_STR           },
+  { EINTR,               EINTR_STR           },
+  { EIO,                 EIO_STR             },
+  { ENXIO,               ENXIO_STR           },
+  { E2BIG,               E2BIG_STR           },
+  { ENOEXEC,             ENOEXEC_STR         },
+  { EBADF,               EBADF_STR           },
+  { ECHILD,              ECHILD_STR          },
+  { EAGAIN,              EAGAIN_STR          },
+  { ENOMEM,              ENOMEM_STR          },
+  { EACCES,              EACCES_STR          },
+  { EFAULT,              EFAULT_STR          },
+  { ENOTBLK,             ENOTBLK_STR         },
+  { EBUSY,               EBUSY_STR           },
+  { EEXIST,              EEXIST_STR          },
+  { EXDEV,               EXDEV_STR           },
+  { ENODEV,              ENODEV_STR          },
+  { ENOTDIR,             ENOTDIR_STR         },
+  { EISDIR,              EISDIR_STR          },
+  { EINVAL,              EINVAL_STR          },
+  { ENFILE,              ENFILE_STR          },
+  { EMFILE,              EMFILE_STR          },
+  { ENOTTY,              ENOTTY_STR          },
+  { ETXTBSY,             ETXTBSY_STR         },
+  { EFBIG,               EFBIG_STR           },
+  { ENOSPC,              ENOSPC_STR          },
+  { ESPIPE,              ESPIPE_STR          },
+  { EROFS,               EROFS_STR           },
+  { EMLINK,              EMLINK_STR          },
+  { EPIPE,               EPIPE_STR           },
+  { EDOM,                EDOM_STR            },
+  { ERANGE,              ERANGE_STR          },
+  { EDEADLK,             EDEADLK_STR         },
+  { ENAMETOOLONG,        ENAMETOOLONG_STR    },
+  { ENOLCK,              ENOLCK_STR          },
+  { ENOSYS,              ENOSYS_STR          },
+  { ENOTEMPTY,           ENOTEMPTY_STR       },
+  { ELOOP,               ELOOP_STR           },
+  { ENOMSG,              ENOMSG_STR          },
+  { EIDRM,               EIDRM_STR           },
+  { ECHRNG,              ECHRNG_STR          },
+  { EL2NSYNC,            EL2NSYNC_STR        },
+  { EL3HLT,              EL3HLT_STR          },
+  { EL3RST,              EL3RST_STR          },
+  { ELNRNG,              ELNRNG_STR          },
+  { EUNATCH,             EUNATCH_STR         },
+  { ENOCSI,              ENOCSI_STR          },
+  { EL2HLT,              EL2HLT_STR          },
+  { EBADE,               EBADE_STR           },
+  { EBADR,               EBADR_STR           },
+  { EXFULL,              EXFULL_STR          },
+  { ENOANO,              ENOANO_STR          },
+  { EBADRQC,             EBADRQC_STR         },
+  { EBADSLT,             EBADSLT_STR         },
+  { EBFONT,              EBFONT_STR          },
+  { ENOSTR,              ENOSTR_STR          },
+  { ENODATA,             ENODATA_STR         },
+  { ETIME,               ETIME_STR           },
+  { ENOSR,               ENOSR_STR           },
+  { ENONET,              ENONET_STR          },
+  { ENOPKG,              ENOPKG_STR          },
+  { EREMOTE,             EREMOTE_STR         },
+  { ENOLINK,             ENOLINK_STR         },
+  { EADV,                EADV_STR            },
+  { ESRMNT,              ESRMNT_STR          },
+  { ECOMM,               ECOMM_STR           },
+  { EPROTO,              EPROTO_STR          },
+  { EMULTIHOP,           EMULTIHOP_STR       },
+  { EDOTDOT,             EDOTDOT_STR         },
+  { EBADMSG,             EBADMSG_STR         },
+  { EOVERFLOW,           EOVERFLOW_STR       },
+  { ENOTUNIQ,            ENOTUNIQ_STR        },
+  { EBADFD,              EBADFD_STR          },
+  { EREMCHG,             EREMCHG_STR         },
+  { ELIBACC,             ELIBACC_STR         },
+  { ELIBBAD,             ELIBBAD_STR         },
+  { ELIBSCN,             ELIBSCN_STR         },
+  { ELIBMAX,             ELIBMAX_STR         },
+  { ELIBEXEC,            ELIBEXEC_STR        },
+  { EILSEQ,              EILSEQ_STR          },
+  { ERESTART,            ERESTART_STR        },
+  { ESTRPIPE,            ESTRPIPE_STR        },
+  { EUSERS,              EUSERS_STR          },
+  { ENOTSOCK,            ENOTSOCK_STR        },
+  { EDESTADDRREQ,        EDESTADDRREQ_STR    },
+  { EMSGSIZE,            EMSGSIZE_STR        },
+  { EPROTOTYPE,          EPROTOTYPE_STR      },
+  { ENOPROTOOPT,         ENOPROTOOPT_STR     },
+  { EPROTONOSUPPORT,     EPROTONOSUPPORT_STR },
+  { ESOCKTNOSUPPORT,     ESOCKTNOSUPPORT_STR },
+  { EOPNOTSUPP,          EOPNOTSUPP_STR      },
+  { EPFNOSUPPORT,        EPFNOSUPPORT_STR    },
+  { EAFNOSUPPORT,        EAFNOSUPPORT_STR    },
+  { EADDRINUSE,          EADDRINUSE_STR      },
+  { EADDRNOTAVAIL,       EADDRNOTAVAIL_STR   },
+  { ENETDOWN,            ENETDOWN_STR        },
+  { ENETUNREACH,         ENETUNREACH_STR     },
+  { ENETRESET,           ENETRESET_STR       },
+  { ECONNABORTED,        ECONNABORTED_STR    },
+  { ECONNRESET,          ECONNRESET_STR      },
+  { ENOBUFS,             ENOBUFS_STR         },
+  { EISCONN,             EISCONN_STR         },
+  { ENOTCONN,            ENOTCONN_STR        },
+  { ESHUTDOWN,           ESHUTDOWN_STR       },
+  { ETOOMANYREFS,        ETOOMANYREFS_STR    },
+  { ETIMEDOUT,           ETIMEDOUT_STR       },
+  { ECONNREFUSED,        ECONNREFUSED_STR    },
+  { EHOSTDOWN,           EHOSTDOWN_STR       },
+  { EHOSTUNREACH,        EHOSTUNREACH_STR    },
+  { EALREADY,            EALREADY_STR        },
+  { EINPROGRESS,         EINPROGRESS_STR     },
+  { ESTALE,              ESTALE_STR          },
+  { EUCLEAN,             EUCLEAN_STR         },
+  { ENOTNAM,             ENOTNAM_STR         },
+  { ENAVAIL,             ENAVAIL_STR         },
+  { EISNAM,              EISNAM_STR          },
+  { EREMOTEIO,           EREMOTEIO_STR       },
+  { EDQUOT,              EDQUOT_STR          },
+  { ENOMEDIUM,           ENOMEDIUM_STR       },
+  { EMEDIUMTYPE,         EMEDIUMTYPE_STR     }
+};
+
+#else /* CONFIG_LIBC_STRERROR_SHORT */
+
+static const struct errno_strmap_s g_errnomap[] =
+{
+  { EPERM,               "EPERM"             },
+  { ENOENT,              "ENOENT"            },
+  { ESRCH,               "ESRCH"             },
+  { EINTR,               "EINTR"             },
+  { EIO,                 "EIO"               },
+  { ENXIO,               "ENXIO"             },
+  { E2BIG,               "E2BIG"             },
+  { ENOEXEC,             "ENOEXEC"           },
+  { EBADF,               "EBADF"             },
+  { ECHILD,              "ECHILD"            },
+  { EAGAIN,              "EAGAIN"            },
+  { ENOMEM,              "ENOMEM"            },
+  { EACCES,              "EACCES"            },
+  { EFAULT,              "EFAULT"            },
+  { ENOTBLK,             "ENOTBLK"           },
+  { EBUSY,               "EBUSY"             },
+  { EEXIST,              "EEXIST"            },
+  { EXDEV,               "EXDEV"             },
+  { ENODEV,              "ENODEV"            },
+  { ENOTDIR,             "ENOTDIR"           },
+  { EISDIR,              "EISDIR"            },
+  { EINVAL,              "EINVAL"            },
+  { ENFILE,              "ENFILE"            },
+  { EMFILE,              "EMFILE"            },
+  { ENOTTY,              "ENOTTY"            },
+  { ETXTBSY,             "ETXTBSY"           },
+  { EFBIG,               "EFBIG"             },
+  { ENOSPC,              "ENOSPC"            },
+  { ESPIPE,              "ESPIPE"            },
+  { EROFS,               "EROFS"             },
+  { EMLINK,              "EMLINK"            },
+  { EPIPE,               "EPIPE"             },
+  { EDOM,                "EDOM"              },
+  { ERANGE,              "ERANGE"            },
+  { EDEADLK,             "EDEADLK"           },
+  { ENAMETOOLONG,        "ENAMETOOLONG"      },
+  { ENOLCK,              "ENOLCK"            },
+  { ENOSYS,              "ENOSYS"            },
+  { ENOTEMPTY,           "ENOTEMPTY"         },
+  { ELOOP,               "ELOOP"             },
+  { ENOMSG,              "ENOMSG"            },
+  { EIDRM,               "EIDRM"             },
+  { ECHRNG,              "ECHRNG"            },
+  { EL2NSYNC,            "EL2NSYNC"          },
+  { EL3HLT,              "EL3HLT"            },
+  { EL3RST,              "EL3RST"            },
+  { EL3RST,              "EL3RST"            },
+  { EUNATCH,             "EUNATCH"           },
+  { ENOCSI,              "ENOCSI"            },
+  { EL2HLT,              "EL2HLT"            },
+  { EBADE,               "EBADE"             },
+  { EBADR,               "EBADR"             },
+  { EXFULL,              "EXFULL"            },
+  { ENOANO,              "ENOANO"            },
+  { EBADRQC,             "EBADRQC"           },
+  { EBADSLT,             "EBADSLT"           },
+  { EBFONT,              "EBFONT"            },
+  { ENOSTR,              "ENOSTR"            },
+  { ENODATA,             "ENODATA"           },
+  { ETIME,               "ETIME"             },
+  { ENOSR,               "ENOSR"             },
+  { ENONET,              "ENONET"            },
+  { ENOPKG,              "ENOPKG"            },
+  { EREMOTE,             "EREMOTE"           },
+  { ENOLINK,             "ENOLINK"           },
+  { EADV,                "EADV"              },
+  { ESRMNT,              "ESRMNT"            },
+  { ECOMM,               "ECOMM"             },
+  { EPROTO,              "EPROTO"            },
+  { EMULTIHOP,           "EMULTIHOP"         },
+  { EDOTDOT,             "EDOTDOT"           },
+  { EBADMSG,             "EBADMSG"           },
+  { EOVERFLOW,           "EOVERFLOW"         },
+  { ENOTUNIQ,            "ENOTUNIQ"          },
+  { EBADFD,              "EBADFD"            },
+  { EREMCHG,             "EREMCHG"           },
+  { ELIBACC,             "ELIBACC"           },
+  { ELIBBAD,             "ELIBBAD"           },
+  { ELIBSCN,             "ELIBSCN"           },
+  { ELIBMAX,             "ELIBMAX"           },
+  { ELIBEXEC,            "ELIBEXEC"          },
+  { EILSEQ,              "EILSEQ"            },
+  { ERESTART,            "ERESTART"          },
+  { ESTRPIPE,            "ESTRPIPE"          },
+  { EUSERS,              "EUSERS"            },
+  { ENOTSOCK,            "ENOTSOCK"          },
+  { EDESTADDRREQ,        "EDESTADDRREQ"      },
+  { EMSGSIZE,            "EMSGSIZE"          },
+  { EPROTOTYPE,          "EPROTOTYPE"        },
+  { ENOPROTOOPT,         "ENOPROTOOPT"       },
+  { EPROTONOSUPPORT,     "EPROTONOSUPPORT"   },
+  { ESOCKTNOSUPPORT,     "ESOCKTNOSUPPORT"   },
+  { EOPNOTSUPP,          "EOPNOTSUPP"        },
+  { EPFNOSUPPORT,        "EPFNOSUPPORT"      },
+  { EAFNOSUPPORT,        "EAFNOSUPPORT"      },
+  { EADDRINUSE,          "EADDRINUSE"        },
+  { EADDRNOTAVAIL,       "EADDRNOTAVAIL"     },
+  { ENETDOWN,            "ENETDOWN"          },
+  { ENETUNREACH,         "ENETUNREACH"       },
+  { ENETRESET,           "ENETRESET"         },
+  { ECONNABORTED,        "ECONNABORTED"      },
+  { ECONNRESET,          "ECONNRESET"        },
+  { ENOBUFS,             "ENOBUFS"           },
+  { EISCONN,             "EISCONN"           },
+  { ENOTCONN,            "ENOTCONN"          },
+  { ESHUTDOWN,           "ESHUTDOWN"         },
+  { ETOOMANYREFS,        "ETOOMANYREFS"      },
+  { ETIMEDOUT,           "ETIMEDOUT"         },
+  { ECONNREFUSED,        "ECONNREFUSED"      },
+  { EHOSTDOWN,           "EHOSTDOWN"         },
+  { EHOSTUNREACH,        "EHOSTUNREACH"      },
+  { EALREADY,            "EALREADY"          },
+  { EINPROGRESS,         "EINPROGRESS"       },
+  { ESTALE,              "ESTALE"            },
+  { EUCLEAN,             "EUCLEAN"           },
+  { ENOTNAM,             "ENOTNAM"           },
+  { ENAVAIL,             "ENAVAIL"           },
+  { EISNAM,              "EISNAM"            },
+  { EREMOTEIO,           "EREMOTEIO"         },
+  { EDQUOT,              "EDQUOT"            },
+  { ENOMEDIUM,           "ENOMEDIUM"         },
+  { EMEDIUMTYPE,         "EMEDIUMTYPE"     }
+};
+
+#endif /* CONFIG_LIBC_STRERROR_SHORT */
+
+#define NERRNO_STRS (sizeof(g_errnomap) / sizeof(struct errno_strmap_s))
+
+#endif /* CONFIG_LIBC_STRERROR */
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: strerror
+ ************************************************************************/
+
+FAR const char *strerror(int errnum)
+{
+#ifdef CONFIG_LIBC_STRERROR
+  int ndxlow = 0;
+  int ndxhi  = NERRNO_STRS - 1;
+  int ndxmid;
+
+  do
+    {
+      ndxmid = (ndxlow + ndxhi) >> 1;
+      if (errnum > g_errnomap[ndxmid].errnum)
+        {
+          ndxlow = ndxmid + 1;
+        }
+      else if (errnum < g_errnomap[ndxmid].errnum)
+        {
+          ndxhi = ndxmid - 1;
+        }
+      else
+        {
+          return g_errnomap[ndxmid].str;
+        }
+    }
+  while (ndxlow <= ndxhi);
+#endif
+  return "Unknown error";
+}
diff --git a/nuttx/lib/string/lib_strlen.c b/nuttx/lib/string/lib_strlen.c
new file mode 100644
index 000000000..833305809
--- /dev/null
+++ b/nuttx/lib/string/lib_strlen.c
@@ -0,0 +1,55 @@
+/****************************************************************************
+ * lib/string/lib_strlen.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+#ifndef CONFIG_ARCH_STRLEN
+size_t strlen(const char *s)
+{
+  const char *sc;
+  for (sc = s; *sc != '\0'; ++sc);
+  return sc - s;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strncasecmp.c b/nuttx/lib/string/lib_strncasecmp.c
new file mode 100644
index 000000000..be369cf0d
--- /dev/null
+++ b/nuttx/lib/string/lib_strncasecmp.c
@@ -0,0 +1,70 @@
+/****************************************************************************
+ * lib/string/lib_strncasecmp.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ *****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ *****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <string.h>
+#include <ctype.h>
+
+/****************************************************************************
+ * Global Functions
+ *****************************************************************************/
+
+#ifndef CONFIG_ARCH_STRNCASECMP
+int strncasecmp(const char *cs, const char *ct, size_t nb)
+{
+  int result = 0;
+  for (; nb > 0; nb--)
+    {
+      if ((result = (int)toupper(*cs) - (int)toupper(*ct)) != 0 || !*cs)
+        {
+          break;
+        }
+
+      cs++;
+      ct++;
+    }
+  return result;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strncat.c b/nuttx/lib/string/lib_strncat.c
new file mode 100644
index 000000000..af893e0f9
--- /dev/null
+++ b/nuttx/lib/string/lib_strncat.c
@@ -0,0 +1,62 @@
+/************************************************************
+ * lib/string/lib_strncat.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+#ifndef CONFIG_ARCH_STRNCAT
+char *strncat(char *dest, const char *src, size_t n)
+{
+  char *ret   = dest;
+
+  dest  += strlen(dest);
+  for (; n > 0 && *src != '\0' ; n--)
+    {
+      *dest++ = *src++;
+    }
+  *dest = '\0';
+
+  return ret;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strncmp.c b/nuttx/lib/string/lib_strncmp.c
new file mode 100644
index 000000000..ce2282024
--- /dev/null
+++ b/nuttx/lib/string/lib_strncmp.c
@@ -0,0 +1,65 @@
+/****************************************************************************
+ * lib/lib_strncmp.c
+ *
+ *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ *****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ *****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ *****************************************************************************/
+
+#ifndef CONFIG_ARCH_STRNCMP
+int strncmp(const char *cs, const char *ct, size_t nb)
+{
+  int result = 0;
+  for (; nb > 0; nb--)
+    {
+      if ((result = (int)*cs - (int)*ct++) != 0 || !*cs++)
+        {
+          break;
+        }
+    }
+  return result;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strncpy.c b/nuttx/lib/string/lib_strncpy.c
new file mode 100644
index 000000000..149369d50
--- /dev/null
+++ b/nuttx/lib/string/lib_strncpy.c
@@ -0,0 +1,57 @@
+/************************************************************
+ * lib/string/lib_strncpy.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+#ifndef CONFIG_ARCH_STRNCPY
+char *strncpy(char *dest, const char *src, size_t n)
+{
+  char *ret = dest;     /* Value to be returned */
+  char *end = dest + n; /* End of dest buffer + 1 byte */
+
+  while ((*dest++ = *src++) != '\0' && dest != end);
+  return ret;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strndup.c b/nuttx/lib/string/lib_strndup.c
new file mode 100644
index 000000000..ffaf892ea
--- /dev/null
+++ b/nuttx/lib/string/lib_strndup.c
@@ -0,0 +1,93 @@
+/************************************************************************
+ * lib/string//lib_strndup.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+#include "lib_internal.h"
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+/************************************************************************
+ * Name: strndup
+ *
+ * Description:
+ *   The strndup() function is equivalent to the strdup() function,
+ *   duplicating the provided 's' in a new block of memory allocated as
+ *   if by using malloc(), with the exception being that strndup() copies
+ *   at most 'size' plus one bytes into the newly allocated memory,
+ *   terminating the new string with a NUL character. If the length of 's'
+ *   is larger than 'size', only 'size' bytes will be duplicated. If
+ *   'size' is larger than the length of 's', all bytes in s will be
+ *   copied into the new memory buffer, including the terminating NUL
+ *   character. The newly created string will always be properly
+ *   terminated.
+ *
+ ************************************************************************/
+
+FAR char *strndup(FAR const char *s, size_t size)
+{
+  FAR char *news = NULL;
+  if (s)
+    {
+      /* Get the size of the new string = MIN(strlen(s), size) */
+
+      size_t allocsize = strlen(s);
+      if (allocsize > size)
+        {
+          allocsize = size;
+        }
+
+      /* Allocate the new string, adding 1 for the NUL terminator */
+
+      news = (FAR char*)lib_malloc(allocsize + 1);
+      if (news)
+        {
+          /* Copy the string into the allocated memory and add a NUL
+           * terminator in any case.
+           */
+
+          memcpy(news, s, allocsize);
+          news[allocsize] = '\0';
+        }
+    }
+  return news;
+}
diff --git a/nuttx/lib/string/lib_strnlen.c b/nuttx/lib/string/lib_strnlen.c
new file mode 100644
index 000000000..2b64fe984
--- /dev/null
+++ b/nuttx/lib/string/lib_strnlen.c
@@ -0,0 +1,62 @@
+/****************************************************************************
+ * lib/string/lib_strnlen.c
+ *
+ * This file is part of NuttX, contributed by Michael Hrabanek
+ *
+ *   Copyright (C) 2010 Gregory Nutt. All rights reserved.
+ *   Author: Michael Hrabanek
+ *
+ * Derives from the file lib/lib_strlen.c:
+ *
+ *   Copyright (C) 2007, 2008, 2010 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+#ifndef CONFIG_ARCH_STRNLEN
+size_t strnlen(const char *s, size_t maxlen)
+{
+  const char *sc;
+  for (sc = s; maxlen != 0 && *sc != '\0'; maxlen--, ++sc);
+  return sc - s;
+}
+#endif
diff --git a/nuttx/lib/string/lib_strpbrk.c b/nuttx/lib/string/lib_strpbrk.c
new file mode 100644
index 000000000..02e2ea2c7
--- /dev/null
+++ b/nuttx/lib/string/lib_strpbrk.c
@@ -0,0 +1,85 @@
+/****************************************************************************
+ * lib/string/lib_strpbrk.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use str source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions str binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer str
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+char *strpbrk(const char *str, const char *charset)
+{
+  /* Sanity checking */
+
+#ifdef CONFIG_DEBUG
+  if (!str || !charset)
+    {
+      return NULL;
+    }
+#endif
+    
+  /* Check each character in the string */
+
+  while (*str)
+    {
+      /* Check if the character from the string matches any character in the charset */
+
+      if (strchr(charset, *str) != NULL)
+        {
+          /* Yes, then this position must be the first occurrence in string */
+
+          return (char*)str;
+	}
+
+      /* This character from the strings matches none of those in the charset.
+       * Try the next character from the string.
+       */
+
+      str++;
+    }
+
+  /* We have looked at every character in the string, and none of them match any of
+   * the characters in charset.
+   */
+
+  return NULL;
+}
+
diff --git a/nuttx/lib/string/lib_strrchr.c b/nuttx/lib/string/lib_strrchr.c
new file mode 100644
index 000000000..91243ce58
--- /dev/null
+++ b/nuttx/lib/string/lib_strrchr.c
@@ -0,0 +1,68 @@
+/************************************************************************
+ * lib/string/lib_strrchr.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+/* The strrchr() function returns a pointer to the last
+ * occurrence of the character c in the string s.
+ */
+
+char *strrchr(const char *s, int c)
+{
+  if (s)
+    {
+      const char *p = &s[strlen(s) - 1];
+      for (; p >= s; p--)
+        {
+          if (*p == c)
+            {
+              return (char*)p;
+            }
+        }
+    }
+
+  return NULL;
+}
+
diff --git a/nuttx/lib/string/lib_strspn.c b/nuttx/lib/string/lib_strspn.c
new file mode 100644
index 000000000..e7b5ea0a5
--- /dev/null
+++ b/nuttx/lib/string/lib_strspn.c
@@ -0,0 +1,66 @@
+/****************************************************************************
+ * lib/string/lib_strspn.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strspn
+ *
+ * Description:
+ *  strspn() calculates the length of the initial segment of s which
+ *  consists entirely of characters in accept.
+ *
+ ****************************************************************************/
+
+size_t strspn(const char *s, const char *accept)
+{
+  size_t i;
+  for (i = 0; s[i] && strchr(accept, s[i]) != NULL; i++);
+  return i;
+}
diff --git a/nuttx/lib/string/lib_strstr.c b/nuttx/lib/string/lib_strstr.c
new file mode 100644
index 000000000..b8c896fa2
--- /dev/null
+++ b/nuttx/lib/string/lib_strstr.c
@@ -0,0 +1,104 @@
+/****************************************************************************
+ * lib/string/lib_strstr.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use str source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions str binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer str
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+char *strstr(const char *str, const char *substr)
+{
+  const char *candidate;  /* Candidate in str with matching start character */
+  char         ch;        /* First character of the substring */
+  int          len;       /* The length of the substring */
+
+  /* Special case the empty substring */
+
+  len = strlen(substr);
+  ch  = *substr;
+
+  if (!ch)
+    {
+      /* We'll say that an empty substring matches at the beginning of
+       * the string
+       */
+
+      return (char*)str;
+    }
+
+  /* Search for the substring */
+
+  candidate = str;
+  for (;;)
+    {
+      /* strchr() will return a pointer to the next occurrence of the
+       * character ch in the string
+       */
+
+      candidate = strchr(candidate, ch);
+      if (!candidate || strlen(candidate) < len)
+        {
+           /* First character of the substring does not appear in the string
+            * or the remainder of the string is not long enough to contain the
+            * substring.
+            */
+
+           return NULL;
+        }
+
+      /* Check if this is the beginning of a matching substring */
+
+      if (strncmp(candidate, substr, len) == 0)
+        {
+           return (char*)candidate;
+        }
+
+      /* No, find the next candidate after this one */
+
+      candidate++;
+    }
+
+  /* Won't get here, but some compilers might complain */
+
+  return NULL;
+}
+
diff --git a/nuttx/lib/string/lib_strtod.c b/nuttx/lib/string/lib_strtod.c
new file mode 100644
index 000000000..8fecd4571
--- /dev/null
+++ b/nuttx/lib/string/lib_strtod.c
@@ -0,0 +1,241 @@
+/****************************************************************************
+ * lib/string/lib_strtod.c
+ * Convert string to double
+ *
+ *   Copyright (C) 2002 Michael Ringgaard. All rights reserved.
+ *   Copyright (C) 2006-2007 H. Peter Anvin.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+
+#ifdef CONFIG_HAVE_DOUBLE
+
+/****************************************************************************
+ * Pre-processor definitions
+ ****************************************************************************/
+
+/* These are predefined with GCC, but could be issues for other compilers. If
+ * not defined, an arbitrary big number is put in for now.  These should be
+ * added to nuttx/compiler for your compiler.
+ */
+
+#if !defined(__DBL_MIN_EXP__) || !defined(__DBL_MAX_EXP__)
+#  ifdef CONFIG_CPP_HAVE_WARNING
+#    warning "Size of exponent is unknown"
+#  endif
+#  undef  __DBL_MIN_EXP__
+#  define __DBL_MIN_EXP__ (-1021)
+#  undef  __DBL_MAX_EXP__
+#  define __DBL_MAX_EXP__ (1024)
+#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static inline int is_real(double x)
+{
+  const double_t infinite = 1.0/0.0;
+  return (x < infinite) && (x >= -infinite);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/***************************************************(************************
+ * Name: strtod
+ *
+ * Description:
+ *   Convert a string to a double value
+ *
+ ****************************************************************************/
+
+double_t strtod(const char *str, char **endptr)
+{
+  double_t number;
+  int exponent;
+  int negative;
+  char *p = (char *) str;
+  double p10;
+  int n;
+  int num_digits;
+  int num_decimals;
+  const double_t infinite = 1.0/0.0;
+
+  /* Skip leading whitespace */
+
+  while (isspace(*p))
+    {
+      p++;
+    }
+
+  /* Handle optional sign */
+
+  negative = 0;
+  switch (*p)
+    {
+    case '-':
+      negative = 1; /* Fall through to increment position */
+    case '+':
+      p++;
+    }
+
+  number       = 0.;
+  exponent     = 0;
+  num_digits   = 0;
+  num_decimals = 0;
+
+  /* Process string of digits */
+
+  while (isdigit(*p))
+    {
+      number = number * 10. + (*p - '0');
+      p++;
+      num_digits++;
+    }
+
+  /* Process decimal part */
+
+  if (*p == '.')
+    {
+      p++;
+
+      while (isdigit(*p))
+      {
+        number = number * 10. + (*p - '0');
+        p++;
+        num_digits++;
+        num_decimals++;
+      }
+
+      exponent -= num_decimals;
+    }
+
+  if (num_digits == 0)
+    {
+      set_errno(ERANGE);
+      return 0.0;
+    }
+
+  /* Correct for sign */
+
+  if (negative)
+    {
+      number = -number;
+    }
+
+  /* Process an exponent string */
+
+  if (*p == 'e' || *p == 'E')
+    {
+      /* Handle optional sign */
+
+      negative = 0;
+      switch(*++p)
+        {
+        case '-':
+          negative = 1;   /* Fall through to increment pos */
+        case '+':
+          p++;
+        }
+
+      /* Process string of digits */
+
+      n = 0;
+      while (isdigit(*p))
+        {
+          n = n * 10 + (*p - '0');
+          p++;
+        }
+
+      if (negative)
+        {
+          exponent -= n;
+        }
+      else
+        {
+          exponent += n;
+        }
+    }
+
+  if (exponent < __DBL_MIN_EXP__ ||
+      exponent > __DBL_MAX_EXP__)
+    {
+      set_errno(ERANGE);
+      return infinite;
+    }
+
+  /* Scale the result */
+
+  p10 = 10.;
+  n = exponent;
+  if (n < 0) n = -n;
+  while (n)
+    {
+      if (n & 1)
+        {
+          if (exponent < 0)
+            {
+              number /= p10;
+            }
+          else
+            {
+              number *= p10;
+            }
+        }
+      n >>= 1;
+      p10 *= p10;
+    }
+
+  if (!is_real(number))
+    {
+      set_errno(ERANGE);
+    }
+
+  if (endptr)
+    {
+      *endptr = p;
+    }
+
+  return number;
+}
+
+#endif /* CONFIG_HAVE_DOUBLE */
+
diff --git a/nuttx/lib/string/lib_strtok.c b/nuttx/lib/string/lib_strtok.c
new file mode 100644
index 000000000..c40993135
--- /dev/null
+++ b/nuttx/lib/string/lib_strtok.c
@@ -0,0 +1,87 @@
+/****************************************************************************
+ * lib/string/lib_strtok.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <string.h>
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static char *g_saveptr = NULL;
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strtok
+ *
+ * Description:
+ *    The  strtok()  function  parses  a string into a
+ *    sequence of tokens.  On the first call to strtok() the
+ *    string to be parsed should be specified in 'str'.  In
+ *    each subsequent call that should parse the same string, 
+ *    'str' should be NULL.
+ *
+ *    The 'delim' argument specifies a set of characters that
+ *    delimit the tokens in the parsed string.  The caller
+ *    may specify different strings in delim in successive
+ *    calls that parse the same string.
+ *
+ *    Each call to strtok() returns a pointer to a null-
+ *    terminated string containing the next token. This
+ *    string  does not include the delimiting character.  If
+ *    no more tokens are found, strtok() returns NULL.
+ *
+ *    A sequence of two or more contiguous delimiter
+ *    characters in the parsed string is considered to be a
+ *    single delimiter. Delimiter characters at the start or
+ *    end of the string are ignored.  The tokens returned by
+ *    strtok() are always non-empty strings.
+ *
+ * Return
+ *    strtok() returns a pointer to the next token, or NULL
+ *    if there are no more tokens.
+ *
+ ****************************************************************************/
+
+char *strtok(char *str, const char *delim)
+{
+  return strtok_r(str, delim, &g_saveptr);
+}
diff --git a/nuttx/lib/string/lib_strtokr.c b/nuttx/lib/string/lib_strtokr.c
new file mode 100644
index 000000000..1c571b6ae
--- /dev/null
+++ b/nuttx/lib/string/lib_strtokr.c
@@ -0,0 +1,157 @@
+/****************************************************************************
+ * lib/string/lib_strtokr.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <string.h>
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strtok_r
+ *
+ * Description:
+ *   The strtok_r() function is a reentrant version strtok().
+ *   Like strtok(), it  parses  a string into a sequence of
+ *   tokens.  On the first call to strtok() the string to be
+ *   parsed should be specified in 'str'.  In each subsequent
+ *   call that should parse the same string, 'str' should be
+ *   NULL.
+ *
+ *   The 'saveptr' argument is a pointer to a char *
+ *   variable  that  is  used internally by strtok_r() in
+ *   order to maintain context between successive calls
+ *   that parse the same string.
+ *
+ *   On the first call to strtok_r(), 'str' should point to the
+ *   string to be parsed, and the value of 'saveptr' is 
+ *   ignored.  In subsequent calls, 'str' should be NULL, and
+ *   saveptr should be unchanged since the previous call.
+ *
+ *   The 'delim' argument specifies a set of characters that
+ *   delimit the tokens in the parsed string.  The caller
+ *   may specify different strings in delim in successive
+ *   calls that parse the same string.
+ *
+ *   Each call to strtok_r() returns a pointer to a null-
+ *   terminated string containing the next token. This
+ *   string  does not include the delimiting character.  If
+ *   no more tokens are found, strtok_r() returns NULL.
+ *
+ *   A sequence of two or more contiguous delimiter
+ *   characters in the parsed string is considered to be a
+ *   single delimiter. Delimiter characters at the start or
+ *   end of the string are ignored.  The tokens returned by
+ *   strtok() are always non-empty strings.
+ *
+ * Return
+ *    strtok_r() returns a pointer to the next token, or NULL
+ *    if there are no more tokens.
+ *
+ ****************************************************************************/
+
+FAR char *strtok_r(FAR char *str, FAR const char *delim, FAR char **saveptr)
+{
+  char *pbegin;
+  char *pend = NULL;
+
+  /* Decide if we are starting a new string or continuing from
+   * the point we left off.
+   */
+
+  if (str)
+    {
+      pbegin = str;
+    }
+  else if (saveptr && *saveptr)
+    {
+      pbegin = *saveptr;
+    }
+  else
+    {
+      return NULL;
+    }
+
+  /* Find the beginning of the next token */
+
+  for (;
+       *pbegin && strchr(delim, *pbegin) != NULL;
+       pbegin++);
+
+  /* If we are at the end of the string with nothing
+   * but delimiters found, then return NULL.
+   */
+
+  if (!*pbegin)
+    {
+      return NULL;
+    }
+
+  /* Find the end of the token */
+
+  for (pend = pbegin + 1;
+       *pend && strchr(delim, *pend) == NULL;
+       pend++);
+
+
+  /* pend either points to the end of the string or to
+   * the first delimiter after the string.
+   */
+
+  if (*pend)
+    {
+      /* Turn the delimiter into a null terminator */
+
+      *pend++ = '\0';
+    }
+
+  /* Save the pointer where we left off and return the
+   * beginning of the token.
+   */
+
+  if (saveptr)
+    {
+      *saveptr = pend;
+    }
+  return pbegin;
+}
diff --git a/nuttx/lib/string/lib_strtol.c b/nuttx/lib/string/lib_strtol.c
new file mode 100644
index 000000000..c17d87e63
--- /dev/null
+++ b/nuttx/lib/string/lib_strtol.c
@@ -0,0 +1,103 @@
+/****************************************************************************
+ * lib/string/lib_strtol.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strtol
+ *
+ * Description:
+ *   The  strtol() function  converts  the initial part of the string in
+ *   nptr to a long integer value according to the given base, which must be
+ *   between 2 and 36 inclusive, or be the special value 0.
+ *
+ * Warning: does not check for integer overflow!
+ *
+ ****************************************************************************/
+ 
+long strtol(const char *nptr, char **endptr, int base)
+{
+  unsigned long accum = 0;
+  bool negate = false;
+
+  if (nptr)
+    {
+      /* Skip leading spaces */
+
+      lib_skipspace(&nptr);
+
+      /* Check for leading + or - */
+
+      if (*nptr == '-')
+        {
+          negate = true;
+          nptr++;
+        }
+      else if (*nptr == '+')
+        {
+          nptr++;
+        }
+
+      /* Get the unsigned value */
+
+      accum = strtoul(nptr, endptr, base);
+
+      /* Correct the sign of the result */
+
+      if (negate)
+        {
+          return -(long)accum;
+        }
+    }
+  return (long)accum;
+}
+
diff --git a/nuttx/lib/string/lib_strtoll.c b/nuttx/lib/string/lib_strtoll.c
new file mode 100644
index 000000000..242e025c0
--- /dev/null
+++ b/nuttx/lib/string/lib_strtoll.c
@@ -0,0 +1,107 @@
+/****************************************************************************
+ * lib/string/lib_strtoll.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "lib_internal.h"
+
+#ifdef CONFIG_HAVE_LONG_LONG
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strtoll
+ *
+ * Description:
+ *   The  strtol() function  converts  the initial part of the string in
+ *   nptr to a long long integer value according to the given base, which
+ *   must be between 2 and 36 inclusive, or be the special value 0.
+ *
+ * Warning: does not check for integer overflow!
+ *
+ ****************************************************************************/
+ 
+long long strtoll(const char *nptr, char **endptr, int base)
+{
+  unsigned long long accum = 0;
+  bool negate = false;
+
+  if (nptr)
+    {
+      /* Skip leading spaces */
+
+      lib_skipspace(&nptr);
+
+      /* Check for leading + or - */
+
+      if (*nptr == '-')
+        {
+          negate = true;
+          nptr++;
+        }
+      else if (*nptr == '+')
+        {
+          nptr++;
+        }
+
+      /* Get the unsigned value */
+
+      accum = strtoull(nptr, endptr, base);
+
+      /* Correct the sign of the result */
+
+      if (negate)
+        {
+          return -(long long)accum;
+        }
+    }
+  return (long long)accum;
+}
+
+#endif
+
diff --git a/nuttx/lib/string/lib_strtoul.c b/nuttx/lib/string/lib_strtoul.c
new file mode 100644
index 000000000..b0d2d090e
--- /dev/null
+++ b/nuttx/lib/string/lib_strtoul.c
@@ -0,0 +1,98 @@
+/****************************************************************************
+ * /lib/string/lib_strtoul.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdlib.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strtoul
+ *
+ * Description:
+ *   The  strtol() function  converts  the initial part of the string in
+ *   nptr to a long unsigned integer value according to the given base, which
+ *   must be between 2 and 36 inclusive, or be the special value 0.
+ *
+ * Warning: does not check for integer overflow!
+ *
+ ****************************************************************************/
+ 
+unsigned long strtoul(const char *nptr, char **endptr, int base)
+{
+  unsigned long accum = 0;
+  int value;
+
+  if (nptr)
+    {
+      /* Skip leading spaces */
+
+      lib_skipspace(&nptr);
+
+      /* Check for unspecified base */
+
+      base = lib_checkbase(base, &nptr);
+
+      /* Accumulate each "digit" */
+
+      while (lib_isbasedigit(*nptr, base, &value))
+        {
+            accum = accum*base + value;
+            nptr++;
+        }
+
+      /* Return the final pointer to the unused value */
+
+      if (endptr)
+        {
+          *endptr = (char *)nptr;
+        }
+    }
+   return accum;
+}
+
diff --git a/nuttx/lib/string/lib_strtoull.c b/nuttx/lib/string/lib_strtoull.c
new file mode 100644
index 000000000..6567457c0
--- /dev/null
+++ b/nuttx/lib/string/lib_strtoull.c
@@ -0,0 +1,100 @@
+/****************************************************************************
+ * /lib/string/lib_strtoull.c
+ *
+ *   Copyright (C) 2009, 2010 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <stdlib.h>
+
+#include "lib_internal.h"
+
+#ifdef CONFIG_HAVE_LONG_LONG
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strtoull
+ *
+ * Description:
+ *   The  strtol() function  converts  the initial part of the string in
+ *   nptr to a long unsigned integer value according to the given base, which
+ *   must be between 2 and 36 inclusive, or be the special value 0.
+ *
+ ****************************************************************************/
+ 
+unsigned long long strtoull(const char *nptr, char **endptr, int base)
+{
+  unsigned long long accum = 0;
+  int value;
+
+  if (nptr)
+    {
+      /* Skip leading spaces */
+
+      lib_skipspace(&nptr);
+
+      /* Check for unspecified base */
+
+      base = lib_checkbase(base, &nptr);
+
+      /* Accumulate each "digit" */
+
+      while (lib_isbasedigit(*nptr, base, &value))
+        {
+            accum = accum*base + value;
+            nptr++;
+        }
+
+      /* Return the final pointer to the unused value */
+
+      if (endptr)
+        {
+          *endptr = (char *)nptr;
+        }
+    }
+   return accum;
+}
+#endif
+
diff --git a/nuttx/lib/string/lib_vikmemcpy.c b/nuttx/lib/string/lib_vikmemcpy.c
new file mode 100644
index 000000000..b50942aaa
--- /dev/null
+++ b/nuttx/lib/string/lib_vikmemcpy.c
@@ -0,0 +1,348 @@
+/****************************************************************************

+ * File: lib/string/lib_vikmemcpy.c

+ *

+ * This is version of the optimized memcpy by Daniel Vik, adapted to the

+ * NuttX environment.

+ *

+ *   Copyright (C) 1999-2010 Daniel Vik

+ *

+ * Adaptations include:

+ * - File name change

+ * - Use of types defined in stdint.h

+ * - Integration with the NuttX configuration system

+ * - Other cosmetic changes for consistency with NuttX coding standards

+ * 

+ * This software is provided 'as-is', without any express or implied

+ * warranty. In no event will the authors be held liable for any

+ * damages arising from the use of this software.

+ * Permission is granted to anyone to use this software for any

+ * purpose, including commercial applications, and to alter it and

+ * redistribute it freely, subject to the following restrictions:

+ * 

+ * 1. The origin of this software must not be misrepresented; you

+ *    must not claim that you wrote the original software. If you

+ *    use this software in a product, an acknowledgment in the

+ *    use this software in a product, an acknowledgment in the

+ *    product documentation would be appreciated but is not

+ *    required.

+ * 

+ * 2. Altered source versions must be plainly marked as such, and

+ *    must not be misrepresented as being the original software.

+ * 

+ * 3. This notice may not be removed or altered from any source

+ *    distribution.

+ * 

+ * Description: Implementation of the standard library function memcpy.

+ *              This implementation of memcpy() is ANSI-C89 compatible.

+ *

+ * The following configuration options can be set:

+ *

+ *   CONFIG_ENDIAN_BIG

+ *     Uses processor with big endian addressing. Default is little endian.

+ *

+ *   CONFIG_MEMCPY_PRE_INC_PTRS

+ *     Use pre increment of pointers. Default is post increment of pointers.

+ *

+ *   CONFIG_MEMCPY_INDEXED_COPY

+ *     Copying data using array indexing. Using this option, disables the

+ *     CONFIG_MEMCPY_PRE_INC_PTRS option.

+ *

+ *   CONFIG_MEMCPY_64BIT - Compiles memcpy for 64 bit architectures

+ *

+ ****************************************************************************/

+

+/****************************************************************************

+ * Configuration definitions.

+ ****************************************************************************/

+

+#define CONFIG_MEMCPY_INDEXED_COPY

+

+/********************************************************************

+ * Included Files

+ *******************************************************************/

+

+#include <nuttx/config.h>

+#include <nuttx/compiler.h>

+

+#include <stddef.h>

+#include <stdint.h>

+#include <string.h>

+

+/********************************************************************

+ * Pre-processor Definitions

+ *******************************************************************/

+

+/* Can't support CONFIG_MEMCPY_64BIT if the platform does not have 64-bit

+ * integer types.

+ */

+

+#ifndef CONFIG_HAVE_LONG_LONG

+#  undef CONFIG_MEMCPY_64BIT

+#endif

+

+/* Remove definitions when CONFIG_MEMCPY_INDEXED_COPY is defined */

+

+#if defined (CONFIG_MEMCPY_INDEXED_COPY)

+#  if defined (CONFIG_MEMCPY_PRE_INC_PTRS)

+#    undef CONFIG_MEMCPY_PRE_INC_PTRS

+#  endif /* CONFIG_MEMCPY_PRE_INC_PTRS */

+#endif /* CONFIG_MEMCPY_INDEXED_COPY */

+

+/* Definitions for pre and post increment of pointers */

+

+#if defined (CONFIG_MEMCPY_PRE_INC_PTRS)

+

+#  define START_VAL(x)            (x)--

+#  define INC_VAL(x)              *++(x)

+#  define CAST_TO_U8(p, o)        ((uint8_t*)p + o + TYPE_WIDTH)

+#  define WHILE_DEST_BREAK        (TYPE_WIDTH - 1)

+#  define PRE_LOOP_ADJUST         - (TYPE_WIDTH - 1)

+#  define PRE_SWITCH_ADJUST       + 1

+

+#else /* CONFIG_MEMCPY_PRE_INC_PTRS */

+

+#  define START_VAL(x)

+#  define INC_VAL(x)              *(x)++

+#  define CAST_TO_U8(p, o)        ((uint8_t*)p + o)

+#  define WHILE_DEST_BREAK        0

+#  define PRE_LOOP_ADJUST

+#  define PRE_SWITCH_ADJUST

+

+#endif /* CONFIG_MEMCPY_PRE_INC_PTRS */

+

+/* Definitions for endian-ness */

+

+#ifdef CONFIG_ENDIAN_BIG

+

+#  define SHL <<

+#  define SHR >>

+

+#else /* CONFIG_ENDIAN_BIG */

+

+#  define SHL >>

+#  define SHR <<

+

+#endif /* CONFIG_ENDIAN_BIG */

+

+/********************************************************************

+ * Macros for copying words of  different alignment.

+ * Uses incremening pointers.

+ *******************************************************************/

+

+#define CP_INCR()                         \

+{                                         \

+  INC_VAL(dstN) = INC_VAL(srcN);          \

+}

+

+#define CP_INCR_SH(shl, shr)              \

+{                                         \

+  dstWord       = srcWord SHL shl;        \

+  srcWord       = INC_VAL(srcN);          \

+  dstWord      |= srcWord SHR shr;        \

+  INC_VAL(dstN) = dstWord;                \

+}

+

+/********************************************************************

+ * Macros for copying words of  different alignment.

+ * Uses array indexes.

+ *******************************************************************/

+

+#define CP_INDEX(idx)                     \

+{                                         \

+  dstN[idx] = srcN[idx];                  \

+}

+

+#define CP_INDEX_SH(x, shl, shr)          \

+{                                         \

+  dstWord   = srcWord SHL shl;            \

+  srcWord   = srcN[x];                    \

+  dstWord  |= srcWord SHR shr;            \

+  dstN[x]   = dstWord;                    \

+}

+

+/********************************************************************

+ * Macros for copying words of different alignment.

+ * Uses incremening pointers or array indexes depending on

+ * configuration.

+ *******************************************************************/

+

+#if defined (CONFIG_MEMCPY_INDEXED_COPY)

+

+#  define CP(idx)               CP_INDEX(idx)

+#  define CP_SH(idx, shl, shr)  CP_INDEX_SH(idx, shl, shr)

+

+#  define INC_INDEX(p, o)       ((p) += (o))

+

+#else /* CONFIG_MEMCPY_INDEXED_COPY */

+

+#  define CP(idx)               CP_INCR()

+#  define CP_SH(idx, shl, shr)  CP_INCR_SH(shl, shr)

+

+#  define INC_INDEX(p, o)

+

+#endif /* CONFIG_MEMCPY_INDEXED_COPY */

+

+#define COPY_REMAINING(count)                                     \

+{                                                                 \

+  START_VAL(dst8);                                                \

+  START_VAL(src8);                                                \

+                                                                  \

+  switch (count)                                                  \

+    {                                                             \

+    case 7: INC_VAL(dst8) = INC_VAL(src8);                        \

+    case 6: INC_VAL(dst8) = INC_VAL(src8);                        \

+    case 5: INC_VAL(dst8) = INC_VAL(src8);                        \

+    case 4: INC_VAL(dst8) = INC_VAL(src8);                        \

+    case 3: INC_VAL(dst8) = INC_VAL(src8);                        \

+    case 2: INC_VAL(dst8) = INC_VAL(src8);                        \

+    case 1: INC_VAL(dst8) = INC_VAL(src8);                        \

+    case 0:                                                       \

+    default: break;                                               \

+    }                                                             \

+}

+

+#define COPY_NO_SHIFT()                                           \

+{                                                                 \

+  UIntN* dstN = (UIntN*)(dst8 PRE_LOOP_ADJUST);                   \

+  UIntN* srcN = (UIntN*)(src8 PRE_LOOP_ADJUST);                   \

+  size_t length = count / TYPE_WIDTH;                             \

+                                                                  \

+  while (length & 7)                                              \

+    {                                                             \

+      CP_INCR();                                                  \

+      length--;                                                   \

+    }                                                             \

+                                                                  \

+  length /= 8;                                                    \

+                                                                  \

+  while (length--)                                                \

+    {                                                             \

+      CP(0);                                                      \

+      CP(1);                                                      \

+      CP(2);                                                      \

+      CP(3);                                                      \

+      CP(4);                                                      \

+      CP(5);                                                      \

+      CP(6);                                                      \

+      CP(7);                                                      \

+                                                                  \

+      INC_INDEX(dstN, 8);                                         \

+      INC_INDEX(srcN, 8);                                         \

+    }                                                             \

+                                                                  \

+  src8 = CAST_TO_U8(srcN, 0);                                     \

+  dst8 = CAST_TO_U8(dstN, 0);                                     \

+                                                                  \

+  COPY_REMAINING(count & (TYPE_WIDTH - 1));                       \

+                                                                  \

+  return dest;                                                    \

+}

+

+#define COPY_SHIFT(shift)                                         \

+{                                                                 \

+  UIntN* dstN  = (UIntN*)((((UIntN)dst8) PRE_LOOP_ADJUST) &       \

+                           ~(TYPE_WIDTH - 1));                    \

+  UIntN* srcN  = (UIntN*)((((UIntN)src8) PRE_LOOP_ADJUST) &       \

+                           ~(TYPE_WIDTH - 1));                    \

+  size_t length  = count / TYPE_WIDTH;                            \

+  UIntN srcWord = INC_VAL(srcN);                                  \

+  UIntN dstWord;                                                  \

+                                                                  \

+  while (length & 7)                                              \

+    {                                                             \

+      CP_INCR_SH(8 * shift, 8 * (TYPE_WIDTH - shift));            \

+      length--;                                                   \

+    }                                                             \

+                                                                  \

+  length /= 8;                                                    \

+                                                                  \

+  while (length--)                                                \

+    {                                                             \

+      CP_SH(0, 8 * shift, 8 * (TYPE_WIDTH - shift));              \

+      CP_SH(1, 8 * shift, 8 * (TYPE_WIDTH - shift));              \

+      CP_SH(2, 8 * shift, 8 * (TYPE_WIDTH - shift));              \

+      CP_SH(3, 8 * shift, 8 * (TYPE_WIDTH - shift));              \

+      CP_SH(4, 8 * shift, 8 * (TYPE_WIDTH - shift));              \

+      CP_SH(5, 8 * shift, 8 * (TYPE_WIDTH - shift));              \

+      CP_SH(6, 8 * shift, 8 * (TYPE_WIDTH - shift));              \

+      CP_SH(7, 8 * shift, 8 * (TYPE_WIDTH - shift));              \

+                                                                  \

+      INC_INDEX(dstN, 8);                                         \

+      INC_INDEX(srcN, 8);                                         \

+    }                                                             \

+                                                                  \

+  src8 = CAST_TO_U8(srcN, (shift - TYPE_WIDTH));                  \

+  dst8 = CAST_TO_U8(dstN, 0);                                     \

+                                                                  \

+  COPY_REMAINING(count & (TYPE_WIDTH - 1));                       \

+                                                                  \

+  return dest;                                                    \

+}

+

+/********************************************************************

+ * Type Definitions

+ *******************************************************************/

+

+#ifdef CONFIG_MEMCPY_64BIT

+typedef uint64_t            UIntN;

+#  define TYPE_WIDTH        8L

+#else

+typedef uint32_t            UIntN;

+#  define TYPE_WIDTH        4L

+#endif

+

+/********************************************************************

+ * Public Functions

+ *******************************************************************/

+/********************************************************************

+ * Name: memcpy

+ *

+ * Description:

+ *   Copies count bytes from src to dest. No overlap check is performed.

+ *

+ * Input Parameters:

+ *   dest        - pointer to destination buffer

+ *   src         - pointer to source buffer

+ *   count       - number of bytes to copy

+ *

+ * Returned Value:

+ *   A pointer to destination buffer

+ *

+ *******************************************************************/

+

+void *memcpy(void *dest, const void *src, size_t count) 

+{

+  uint8_t *dst8 = (uint8_t*)dest;

+  uint8_t *src8 = (uint8_t*)src;

+

+  if (count < 8)

+    {

+      COPY_REMAINING(count);

+      return dest;

+    }

+

+  START_VAL(dst8);

+  START_VAL(src8);

+

+  while (((UIntN)dst8 & (TYPE_WIDTH - 1)) != WHILE_DEST_BREAK)

+    {

+      INC_VAL(dst8) = INC_VAL(src8);

+      count--;

+    }

+

+  switch ((((UIntN)src8) PRE_SWITCH_ADJUST) & (TYPE_WIDTH - 1))

+    {

+    case 0: COPY_NO_SHIFT(); break;

+    case 1: COPY_SHIFT(1);   break;

+    case 2: COPY_SHIFT(2);   break;

+    case 3: COPY_SHIFT(3);   break;

+#if TYPE_WIDTH > 4

+    case 4: COPY_SHIFT(4);   break;

+    case 5: COPY_SHIFT(5);   break;

+    case 6: COPY_SHIFT(6);   break;

+    case 7: COPY_SHIFT(7);   break;

+#endif

+    }

+

+  return dest;

+}

diff --git a/nuttx/lib/termios/Make.defs b/nuttx/lib/termios/Make.defs
new file mode 100644
index 000000000..a6bb77f83
--- /dev/null
+++ b/nuttx/lib/termios/Make.defs
@@ -0,0 +1,54 @@
+############################################################################
+# lib/misc/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# termios.h support requires file descriptors and that CONFIG_SERIAL_TERMIOS
+# is defined
+
+ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
+ifeq ($(CONFIG_SERIAL_TERMIOS),y)
+
+# Add the termios C files to the build
+
+CSRCS += lib_cfgetspeed.c lib_cfsetspeed.c lib_tcflush.c
+CSRCS += lib_tcgetattr.c lib_tcsetattr.c
+
+# Add the termios directory to the build
+
+DEPPATH += --dep-path termios
+VPATH += termios
+
+endif
+endif
+
diff --git a/nuttx/lib/termios/lib_cfgetspeed.c b/nuttx/lib/termios/lib_cfgetspeed.c
new file mode 100644
index 000000000..d7f0dc473
--- /dev/null
+++ b/nuttx/lib/termios/lib_cfgetspeed.c
@@ -0,0 +1,93 @@
+/****************************************************************************
+ * lib/termios/lib_cfgetspeed.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <termios.h>
+#include <assert.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cfgetspeed
+ *
+ * Descripton:
+ *   The cfgetspeed() function is a non-POSIX function will extract the baud
+ *   from the termios structure to which the termiosp argument points.
+ *
+ *   This function will return exactly the value in the termios data
+ *   structure, without interpretation.
+ *
+ *   NOTE 1: NuttX does not control input/output baud independently.  Both
+ *   must be the same.  The POSIX standard interfaces, cfisetispeed() and
+ *   cfisetospeed() are defined to be cfgetspeed() in termios.h.
+ *   NOTE 2.  In Nuttx, the speed_t is defined to be uint32_t and the baud
+ *   encodings of termios.h are the actual baud values themselves.  Therefore,
+ *   any baud value may be returned here... not just those enumerated in
+ *   termios.h
+ *
+ * Input Parameters:
+ *   termiosp - The termiosp argument is a pointer to a termios structure.
+ *
+ * Returned Value:
+ *   Encoded baud value from the termios structure. 
+ *
+ ****************************************************************************/
+
+speed_t cfgetspeed(FAR const struct termios *termiosp)
+{
+  DEBUGASSERT(termiosp);
+  return termiosp->c_speed;
+}
diff --git a/nuttx/lib/termios/lib_cfsetspeed.c b/nuttx/lib/termios/lib_cfsetspeed.c
new file mode 100644
index 000000000..714562ff5
--- /dev/null
+++ b/nuttx/lib/termios/lib_cfsetspeed.c
@@ -0,0 +1,116 @@
+/****************************************************************************
+ * lib/termios/lib_cfsetspeed.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <termios.h>
+#include <assert.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cfsetspeed
+ *
+ * Descripton:
+ *   The cfsetspeed() function is a non-POSIX function that sets the baud
+ *   stored in the structure pointed to by termiosp to speed.
+ *
+ *   There is no effect on the baud set in the hardware until a subsequent
+ *   successful call to tcsetattr() on the same termios structure. 
+ *
+ *   NOTE 1: NuttX does not control input/output baud independently.  Both
+ *   must be the same.  The POSIX standard interfaces, cfisetispeed() and
+ *   cfisetospeed() are defined to be cfsetspeed() in termios.h.
+ *
+ *   NOTE 3:  A consequence of NOTE 1 is that you should never attempt to
+ *   set the input and output baud to different values.
+ *
+ *   Also, the following POSIX requirement cannot be supported: "If the input
+ *   baud rate stored in the termios structure pointed to by termios_p is 0,
+ *   the input baud rate given to the hardware will be the same as the output
+ *   baud rate stored in the termios structure."
+ *
+ *   NOTE 2.  In Nuttx, the speed_t is defined to be uint32_t and the baud
+ *   encodings of termios.h are the actual baud values themselves.  Therefore,
+ *   any baud value can be provided as the speed argument here.  However, if
+ *   you do so, your code will *NOT* be portable to other environments where
+ *   speed_t is smaller and where the termios.h baud values are encoded! To
+ *   avoid portability issues, use the baud definitions in termios.h!
+ *
+ *   Linux, for example, would require this (also non-portable) sequence:
+ *
+ *     cfsetispeed(termiosp, BOTHER);
+ *     termiosp->c_ispeed = baud;
+ *
+ *     cfsetospeed(termiosp, BOTHER);
+ *     termiosp->c_ospeed = baud;
+ *
+ * Input Parameters:
+ *   termiosp - The termiosp argument is a pointer to a termios structure.
+ *   speed - The new input speed
+ *
+ * Returned Value:
+ *   Baud is not checked... OK is always returned (this is non-standard
+ *   behavior). 
+ *
+ ****************************************************************************/
+
+int cfsetspeed(FAR struct termios *termiosp, speed_t speed)
+{
+  DEBUGASSERT(termiosp);
+  termiosp->c_speed = speed;
+  return OK;
+}
diff --git a/nuttx/lib/termios/lib_tcflush.c b/nuttx/lib/termios/lib_tcflush.c
new file mode 100644
index 000000000..338524bdd
--- /dev/null
+++ b/nuttx/lib/termios/lib_tcflush.c
@@ -0,0 +1,88 @@
+/****************************************************************************
+ * lib/termios/lib_tcflush.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/ioctl.h>
+
+#include <termios.h>
+#include <errno.h>
+
+#include <nuttx/serial/tioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: tcflush
+ *
+ * Descripton:
+ *   Function for flushing a terminal/serial device
+ *
+ * Input Parameters:
+ *   fd  - The 'fd' argument is an open file descriptor associated with a terminal.
+ *   cmd - The TCFLSH ioctl argument.
+ *
+ * Returned Value:
+ *   Upon successful completion, 0 is returned. Otherwise, -1 is returned and
+ *   errno is set to indicate the error.
+ *
+ ****************************************************************************/
+
+int tcflush(int fd, int cmd)
+{
+  return ioctl(fd, TCFLSH, (unsigned long)cmd);
+}
diff --git a/nuttx/lib/termios/lib_tcgetattr.c b/nuttx/lib/termios/lib_tcgetattr.c
new file mode 100644
index 000000000..500871d9f
--- /dev/null
+++ b/nuttx/lib/termios/lib_tcgetattr.c
@@ -0,0 +1,93 @@
+/****************************************************************************
+ * lib/termios/lib_tcgetattr.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/ioctl.h>
+
+#include <termios.h>
+#include <errno.h>
+
+#include <nuttx/serial/tioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: tcgetattr
+ *
+ * Descripton:
+ *   The tcgetattr() function gets the parameters associated with the
+ *   terminal referred to by 'fd' and stores them in the termios structure
+ *   referenced by 'termiosp'.
+ *
+ * Input Parameters:
+ *   fd - The 'fd' argument is an open file descriptor associated with a terminal.
+ *   termiosp - The termiosp argument is a pointer to a termios structure.
+ *
+ * Returned Value:
+ *   Upon successful completion, 0 is returned. Otherwise, -1 is returned and
+ *   errno is set to indicate the error.  The following errors may be reported:
+ *
+ *   - EBADF: The 'fd' argument is not a valid file descriptor. 
+ *   - ENOTTY: The file associated with 'fd' is not a terminal. 
+ *
+ ****************************************************************************/
+
+int tcgetattr(int fd, FAR struct termios *termiosp)
+{
+  return ioctl(fd, TCGETS, (unsigned long)termiosp);
+}
diff --git a/nuttx/lib/termios/lib_tcsetattr.c b/nuttx/lib/termios/lib_tcsetattr.c
new file mode 100644
index 000000000..791b519c8
--- /dev/null
+++ b/nuttx/lib/termios/lib_tcsetattr.c
@@ -0,0 +1,122 @@
+/****************************************************************************
+ * lib/termios/lib_tcsetattr.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/ioctl.h>
+
+#include <termios.h>
+#include <errno.h>
+
+#include <nuttx/serial/tioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: tcsetattr
+ *
+ * Descripton:
+ *   The tcsetattr() function sets the parameters associated with the
+ *   terminal referred to by the open file descriptor 'fd' from the termios
+ *   structure referenced by 'termiop' as follows:
+ *
+ *   If 'options' is TCSANOW, the change will occur immediately.
+ *
+ *   If 'options' is TCSADRAIN, the change will occur after all output
+ *   written to 'fd' is transmitted. This function should be used when changing
+ *   parameters that affect output.
+ *
+ *   If 'options' is TCSAFLUSH, the change will occur after all
+ *   output written to 'fd' is transmitted, and all input so far received but
+ *   not read will be discarded before the change is made.
+ *
+ *   The tcsetattr() function will return successfully if it was able to
+ *   perform any of the requested actions, even if some of the requested
+ *   actions could not be performed. It will set all the attributes that
+ *   implementation supports as requested and leave all the attributes not
+ *   supported by the implementation unchanged. If no part of the request
+ *   can be honoured, it will return -1 and set errno to EINVAL.
+ *
+ *   The effect of tcsetattr() is undefined if the value of the termios
+ *   structure pointed to by 'termiop' was not derived from the result of
+ *   a call to tcgetattr() on 'fd'; an application should modify only fields
+ *   and flags defined by this specification between the call to tcgetattr()
+ *   and tcsetattr(), leaving all other fields and flags unmodified.
+ *
+ * Returned Value:
+ *
+ *   Upon successful completion, 0 is returned. Otherwise, -1 is returned
+ *   and errno is set to indicate the error.  The following errors may be
+ *   reported:
+ *
+ *   - EBADF: The 'fd' argument is not a valid file descriptor. 
+ *   - EINTR:  A signal interrupted tcsetattr(). 
+ *   - EINVAL: The 'options' argument is not a supported value, or
+ *     an attempt was made to change an attribute represented in the
+ *     termios structure to an unsupported value. 
+ *   - ENOTTY: The file associated with 'fd' is not a terminal. 
+ *
+ ****************************************************************************/
+
+int tcsetattr(int fd, int options, FAR const struct termios *termiosp)
+{
+  if (options == TCSANOW)
+    {
+      return ioctl(fd, TCSETS, (unsigned long)termiosp);
+    }
+  return -ENOSYS;
+}
diff --git a/nuttx/lib/time/Make.defs b/nuttx/lib/time/Make.defs
new file mode 100644
index 000000000..ab7414229
--- /dev/null
+++ b/nuttx/lib/time/Make.defs
@@ -0,0 +1,44 @@
+############################################################################
+# lib/time/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the time C files to the build
+
+CSRCS += lib_mktime.c lib_gmtime.c lib_gmtimer.c lib_strftime.c \
+		  lib_calendar2utc.c lib_daysbeforemonth.c lib_isleapyear.c lib_time.c
+
+# Add the time directory to the build
+
+DEPPATH += --dep-path time
+VPATH += :time
diff --git a/nuttx/lib/time/lib_calendar2utc.c b/nuttx/lib/time/lib_calendar2utc.c
new file mode 100644
index 000000000..e80c292fc
--- /dev/null
+++ b/nuttx/lib/time/lib_calendar2utc.c
@@ -0,0 +1,209 @@
+/****************************************************************************
+ * lib/time/lib_calendar2utc.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <time.h>
+#include <debug.h>
+
+#include <nuttx/time.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  clock_gregorian2utc, clock_julian2utc
+ *
+ * Description:
+ *    UTC conversion routines.  These conversions are based
+ *    on algorithms from p. 604 of Seidelman, P. K. 1992.
+ *    Explanatory Supplement to the Astronomical Almanac.
+ *    University Science Books, Mill Valley. 
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_GREGORIAN_TIME
+static time_t clock_gregorian2utc(int year, int month, int day)
+{
+  int temp;
+
+  /* temp = (month - 14)/12; */
+
+  temp = (month <= 2 ? -1:0);
+
+  return (1461*(year + 4800 + temp))/4
+    + (367*(month - 2 - 12*temp))/12
+    - (3*((year + 4900 + temp)/100))/4 + day - 32075;
+}
+
+#ifdef CONFIG_JULIAN_TIME
+static time_t clock_julian2utc(int year, int month, int day)
+{
+  return 367*year
+    - (7*(year + 5001 + (month-9)/7))/4
+    + (275*month)/9
+    + day + 1729777;
+}
+#endif /* CONFIG_JULIAN_TIME */
+#endif /* CONFIG_GREGORIAN_TIME */
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  clock_calendar2utc
+ *
+ * Description:
+ *    Calendar/UTC conversion based on algorithms from p. 604
+ *    of Seidelman, P. K. 1992.  Explanatory Supplement to
+ *    the Astronomical Almanac.  University Science Books,
+ *    Mill Valley. 
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_GREGORIAN_TIME
+time_t clock_calendar2utc(int year, int month, int day)
+{
+  int dyear;
+#ifdef CONFIG_JULIAN_TIME
+  bool isgreg;
+#endif /* CONFIG_JULIAN_TIME */
+
+  /* Correct year & month ranges.  Shift month into range 1-12 */
+
+  dyear = (month-1) / 12;	
+  month -= 12 * dyear;
+  year += dyear;
+
+  if (month < 1)
+    {
+      month += 12;
+      year -= 1;
+    }
+
+#ifdef CONFIG_JULIAN_TIME
+  /* Determine which calendar to use */
+
+  if (year > GREG_YEAR)
+    {
+      isgreg = true;
+    }
+  else if (year < GREG_YEAR)
+    {
+      isgreg = false;
+    }
+  else if (month > GREG_MONTH)
+    {
+      isgreg = true;
+    }
+  else if (month < GREG_MONTH)
+    {
+      isgreg = false;
+    }
+  else
+    {
+      isgreg = (day >= GREG_DAY);
+    }
+
+  /* Calculate and return date */
+
+  if (isgreg)
+    {
+      return clock_gregorian2utc(year, month, day) - JD_OF_EPOCH;
+    }
+  else
+    {
+      return clock_julian2utc (year, month, day) - JD_OF_EPOCH;
+    }
+
+#else /* CONFIG_JULIAN_TIME */
+
+  return clock_gregorian2utc(year, month, day) - JD_OF_EPOCH;
+
+#endif /* CONFIG_JULIAN_TIME */
+}
+#else
+
+/* A highly simplified version that only handles days in the time
+ * since Jan 1, 1970.
+ */
+
+time_t clock_calendar2utc(int year, int month, int day)
+{
+  struct tm t;
+
+  /* mktime can (kind of) do this */
+
+  t.tm_year = year;
+  t.tm_mon  = month;
+  t.tm_mday = day;
+  t.tm_hour = 0;
+  t.tm_min  = 0;
+  t.tm_sec  = 0;
+  return mktime(&t);
+}
+#endif /* CONFIG_GREGORIAN_TIME */
+
diff --git a/nuttx/lib/time/lib_daysbeforemonth.c b/nuttx/lib/time/lib_daysbeforemonth.c
new file mode 100644
index 000000000..8000b0e7a
--- /dev/null
+++ b/nuttx/lib/time/lib_daysbeforemonth.c
@@ -0,0 +1,102 @@
+/****************************************************************************
+ * lib/time/lib_daysbeforemonth.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <nuttx/time.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+uint16_t g_daysbeforemonth[13] =
+{
+  0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
+};
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  clock_daysbeforemonth
+ *
+ * Description:
+ *    Get the number of days that occurred before the beginning of the month.
+ *
+ ****************************************************************************/
+
+int clock_daysbeforemonth(int month, bool leapyear)
+{
+  int retval = g_daysbeforemonth[month];
+  if (month >= 2 && leapyear)
+    {
+      retval++;
+    }
+  return retval;
+}
+
+
diff --git a/nuttx/lib/time/lib_gmtime.c b/nuttx/lib/time/lib_gmtime.c
new file mode 100644
index 000000000..99afeded9
--- /dev/null
+++ b/nuttx/lib/time/lib_gmtime.c
@@ -0,0 +1,93 @@
+/****************************************************************************
+ * lib/time/lib_gmtime.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <time.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/time.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/**************************************************************************
+ * Public Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/**************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  gmtime
+ *
+ * Description:
+ *  Similar to gmtime_r, but not thread-safe
+ *
+ ****************************************************************************/
+
+struct tm *gmtime(const time_t *timer)
+{
+  static struct tm tm;
+  return gmtime_r(timer, &tm);
+}
+
diff --git a/nuttx/lib/time/lib_gmtimer.c b/nuttx/lib/time/lib_gmtimer.c
new file mode 100644
index 000000000..ba1c9724f
--- /dev/null
+++ b/nuttx/lib/time/lib_gmtimer.c
@@ -0,0 +1,355 @@
+/****************************************************************************
+ * lib/time/lib_gmtimer.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <time.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/time.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#define SEC_PER_MIN  ((time_t)60)
+#define SEC_PER_HOUR ((time_t)60 * SEC_PER_MIN)
+#define SEC_PER_DAY  ((time_t)24 * SEC_PER_HOUR)
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/* Calendar/UTC conversion routines */
+
+static void   clock_utc2calendar(time_t utc, int *year, int *month, int *day);
+#ifdef CONFIG_GREGORIAN_TIME
+static void   clock_utc2gregorian (time_t jdn, int *year, int *month, int *day);
+
+#ifdef CONFIG_JULIAN_TIME
+static void   clock_utc2julian(time_t jdn, int *year, int *month, int *day);
+#endif /* CONFIG_JULIAN_TIME */
+#endif /* CONFIG_GREGORIAN_TIME */
+
+/**************************************************************************
+ * Public Constant Data
+ **************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/**************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  clock_calendar2utc, clock_gregorian2utc,
+ *            and clock_julian2utc
+ *
+ * Description:
+ *    Calendar to UTC conversion routines.  These conversions
+ *    are based on algorithms from p. 604 of Seidelman, P. K.
+ *    1992.  Explanatory Supplement to the Astronomical
+ *    Almanac.  University Science Books, Mill Valley. 
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_GREGORIAN_TIME
+static void clock_utc2calendar(time_t utc, int *year, int *month, int *day)
+{
+#ifdef CONFIG_JULIAN_TIME
+
+  if (utc >= GREG_DUTC)
+    {
+      clock_utc2gregorian(utc + JD_OF_EPOCH, year, month, day);
+    }
+  else
+    {
+      clock_utc2julian (utc + JD_OF_EPOCH, year, month, day);
+    }
+
+#else /* CONFIG_JULIAN_TIME */
+
+  clock_utc2gregorian(utc + JD_OF_EPOCH, year, month, day);
+
+#endif /* CONFIG_JULIAN_TIME */
+}
+
+static void clock_utc2gregorian(time_t jd, int *year, int *month, int *day)
+{
+  long	l, n, i, j, d, m, y;
+
+  l = jd + 68569;
+  n = (4*l) / 146097;
+  l = l - (146097*n + 3)/4;
+  i = (4000*(l+1))/1461001;
+  l = l - (1461*i)/4 + 31;
+  j = (80*l)/2447;
+  d = l - (2447*j)/80;
+  l = j/11;
+  m = j + 2 - 12*l;
+  y = 100*(n-49) + i + l;
+
+  *year  = y;
+  *month = m;
+  *day   = d;
+}
+
+#ifdef CONFIG_JULIAN_TIME
+
+static void clock_utc2julian(time_t jd, int *year, int *month, int *day)
+{
+  long	j, k, l, n, d, i, m, y;
+
+  j = jd + 1402;
+  k = (j-1)/1461;
+  l = j - 1461*k;
+  n = (l-1)/365 - l/1461;
+  i = l - 365*n + 30;
+  j = (80*i)/2447;
+  d = i - (2447*j)/80;
+  i = j/11;
+  m = j + 2 - 12*i;
+  y = 4*k + n + i - 4716;
+
+  *year  = y;
+  *month = m;
+  *day   = d;
+}
+
+#endif /* CONFIG_JULIAN_TIME */
+#else/* CONFIG_GREGORIAN_TIME */
+
+/* Only handles dates since Jan 1, 1970 */
+
+static void clock_utc2calendar(time_t days, int *year, int *month, int *day)
+{
+  int  value;
+  int  min;
+  int  max;
+  int  tmp;
+  bool leapyear;
+
+  /* There is one leap year every four years, so we can get close with the
+   * following:
+   */
+
+  value   = days  / (4*365 + 1);  /* Number of 4-years periods since the epoch*/
+  days   -= value * (4*365 + 1);  /* Remaining days */
+  value <<= 2;                    /* Years since the epoch */
+
+  /* Then we will brute force the next 0-3 years */
+
+  for (;;)
+    {
+      /* Is this year a leap year (we'll need this later too) */
+
+      leapyear = clock_isleapyear(value + 1970);
+
+      /* Get the number of days in the year */
+
+      tmp = (leapyear ? 366 : 365);
+
+      /* Do we have that many days? */
+
+      if (days >= tmp)
+        {
+           /* Yes.. bump up the year */
+
+           value++;
+           days -= tmp;
+        }
+      else
+        {
+           /* Nope... then go handle months */
+
+           break;
+        }
+    }
+
+  /* At this point, value has the year and days has number days into this year */
+
+  *year = 1970 + value;
+
+  /* Handle the month (zero based) */
+
+  min = 0;
+  max = 11;
+
+  do
+    {
+      /* Get the midpoint */
+
+      value = (min + max) >> 1;
+
+      /* Get the number of days that occurred before the beginning of the month
+       * following the midpoint.
+      */
+
+      tmp = clock_daysbeforemonth(value + 1, leapyear);
+
+      /* Does the number of days before this month that equal or exceed the
+       * number of days we have remaining?
+       */
+
+      if (tmp > days)
+        {
+          /* Yes.. then the month we want is somewhere from 'min' and to the
+           * midpoint, 'value'.  Could it be the midpoint?
+           */
+
+          tmp = clock_daysbeforemonth(value, leapyear);
+          if (tmp > days)
+            {
+              /* No... The one we want is somewhere between min and value-1 */
+
+              max = value - 1;
+            }
+          else
+            {
+              /* Yes.. 'value' contains the month that we want */
+
+              break;
+            }
+        }
+      else
+        {
+           /* No... The one we want is somwhere between value+1 and max */
+
+           min = value + 1;
+        }
+
+      /* If we break out of the loop because min == max, then we want value
+       * to be equal to min == max.
+       */
+
+      value = min;
+    }
+  while (min < max);
+
+  /* The selected month number is in value. Subtract the number of days in the
+   * selected month
+   */
+
+  days -= clock_daysbeforemonth(value, leapyear);
+
+  /* At this point, value has the month into this year (zero based) and days has
+   * number of days into this month (zero based)
+   */
+
+  *month = value + 1; /* 1-based */
+  *day   = days + 1;  /* 1-based */
+}
+
+#endif /* CONFIG_GREGORIAN_TIME */
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  gmtime_r
+ *
+ * Description:
+ *  Time conversion (based on the POSIX API)
+ *
+ ****************************************************************************/
+
+FAR struct tm *gmtime_r(FAR const time_t *timer, FAR struct tm *result)
+{
+  time_t epoch;
+  time_t jdn;
+  int    year;
+  int    month;
+  int    day;
+  int    hour;
+  int    min;
+  int    sec;
+
+  /* Get the seconds since the EPOCH */
+
+  epoch = *timer;
+  sdbg("timer=%d\n", (int)epoch);
+
+  /* Convert to days, hours, minutes, and seconds since the EPOCH */
+
+  jdn    = epoch / SEC_PER_DAY;
+  epoch -= SEC_PER_DAY * jdn;
+
+  hour   = epoch / SEC_PER_HOUR;
+  epoch -= SEC_PER_HOUR * hour;
+
+  min    = epoch / SEC_PER_MIN;
+  epoch -= SEC_PER_MIN * min;
+
+  sec    = epoch;
+
+  sdbg("hour=%d min=%d sec=%d\n",
+       (int)hour, (int)min, (int)sec);
+
+  /* Convert the days since the EPOCH to calendar day */
+
+  clock_utc2calendar(jdn, &year, &month, &day);
+
+  sdbg("jdn=%d year=%d month=%d day=%d\n",
+       (int)jdn, (int)year, (int)month, (int)day);
+
+  /* Then return the struct tm contents */
+
+  result->tm_year = (int)year - 1900; /* Relative to 1900 */
+  result->tm_mon  = (int)month - 1;   /* zero-based */
+  result->tm_mday = (int)day;         /* one-based */
+  result->tm_hour = (int)hour;
+  result->tm_min  = (int)min;
+  result->tm_sec  = (int)sec;
+
+  return result;
+}
+
diff --git a/nuttx/lib/time/lib_isleapyear.c b/nuttx/lib/time/lib_isleapyear.c
new file mode 100644
index 000000000..966c248e0
--- /dev/null
+++ b/nuttx/lib/time/lib_isleapyear.c
@@ -0,0 +1,88 @@
+/****************************************************************************
+ * lib/time/lib_isleapyear.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/time.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  clock_isleapyear
+ *
+ * Description:
+ *    Return true if the specified year is a leap year
+ *
+ ****************************************************************************/
+
+int clock_isleapyear(int year)
+{
+  return year % 400 ? (year % 100 ? (year % 4 ? 0 : 1) : 0) : 1;
+}
+
diff --git a/nuttx/lib/time/lib_mktime.c b/nuttx/lib/time/lib_mktime.c
new file mode 100644
index 000000000..8c17e7c0a
--- /dev/null
+++ b/nuttx/lib/time/lib_mktime.c
@@ -0,0 +1,141 @@
+/****************************************************************************
+ * lib/time/lib_mktime.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <time.h>
+#include <debug.h>
+
+#include <nuttx/time.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  mktime
+ *
+ * Description:
+ *  Time conversion (based on the POSIX API)
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_GREGORIAN_TIME
+time_t mktime(const struct tm *tp)
+{
+  time_t ret;
+  time_t jdn;
+
+  /* Get the EPOCH-relative julian date from the calendar year,
+   * month, and date
+   */
+
+  jdn = clock_calendar2utc(tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday);
+  sdbg("jdn=%d tm_year=%d tm_mon=%d tm_mday=%d\n",
+       (int)jdn, tp->tm_year, tp->tm_mon, tp->tm_mday);
+
+  /* Return the seconds into the julian day. */
+
+  ret = ((jdn*24 + tp->tm_hour)*60 + tp->tm_min)*60 + tp->tm_sec;
+  sdbg("ret=%d tm_hour=%d tm_min=%d tm_sec=%d\n",
+       (int)ret, tp->tm_hour, tp->tm_min, tp->tm_sec);
+
+  return ret;
+}
+#else
+
+/* Simple version that only works for dates within a (relatively) small range
+ * from the epoch.  It does not handle earlier days or longer days where leap
+ * seconds, etc. apply.
+ */
+
+time_t mktime(const struct tm *tp)
+{
+  unsigned int days;
+
+  /* Years since epoch in units of days (ignoring leap years). */
+
+  days = (tp->tm_year - 70) * 365;
+
+  /* Add in the extra days for the leap years prior to the current year. */
+
+  days += (tp->tm_year - 69) >> 2;
+
+  /* Add in the days up to the beginning of this month. */
+
+  days += (time_t)clock_daysbeforemonth(tp->tm_mon, clock_isleapyear(tp->tm_year + 1900));
+
+  /* Add in the days since the beginning of this month (days are 1-based). */
+
+  days += tp->tm_mday - 1;
+
+  /* Then convert the seconds and add in hours, minutes, and seconds */
+
+  return ((days * 24 + tp->tm_hour) * 60 + tp->tm_min) * 60 + tp->tm_sec;
+}
+#endif /* CONFIG_GREGORIAN_TIME */
+
diff --git a/nuttx/lib/time/lib_strftime.c b/nuttx/lib/time/lib_strftime.c
new file mode 100644
index 000000000..cd0804f55
--- /dev/null
+++ b/nuttx/lib/time/lib_strftime.c
@@ -0,0 +1,398 @@
+/****************************************************************************
+ * lib/time/lib_strftime.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+
+#include <stdio.h>
+#include <time.h>
+#include <debug.h>
+
+#include <nuttx/time.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const char * const g_abbrevmonthname[12] =
+{
+  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+static const char * const g_monthname[12] =
+{
+  "January", "February", "March",     "April",   "May",      "June",
+  "July",    "August",   "September", "October", "November", "December"
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  strftime
+ *
+ * Description:
+ *   The  strftime()  function  formats the broken-down time tm according to
+ *   the format specification format and places the result in the  character
+ *   array s of size max.
+ *
+ *   Ordinary characters placed in the format string are copied to s without
+ *   conversion.  Conversion specifications are introduced by a '%'  charac-
+ *   ter,  and  terminated  by  a  conversion  specifier  character, and are
+ *   replaced in s as follows:
+ *
+ *   %b     The abbreviated month name according to the current locale.
+ *   %B     The full month name according to the current locale.
+ *   %C     The century number (year/100) as a 2-digit integer. (SU)
+ *   %d     The day of the month as a decimal number (range 01 to 31).
+ *   %e     Like %d, the day of the month as a decimal number, but a leading
+ *          zero is replaced by a space.
+ *   %h     Equivalent to %b.  (SU)
+ *   %H     The hour as a decimal number using a 24-hour clock (range 00 to 23).
+ *   %I     The  hour as a decimal number using a 12-hour clock (range 01 to 12).
+ *   %j     The day of the year as a decimal number (range 001 to 366).
+ *   %k     The hour (24-hour clock) as a decimal number (range  0  to  23);
+ *          single digits are preceded by a blank.  (See also %H.)  (TZ)
+ *   %l     The  hour  (12-hour  clock) as a decimal number (range 1 to 12);
+ *          single digits are preceded by a blank.  (See also %I.)  (TZ)
+ *   %m     The month as a decimal number (range 01 to 12).
+ *   %M     The minute as a decimal number (range 00 to 59).
+ *   %n     A newline character. (SU)
+ *   %p     Either "AM" or "PM" according to the given time  value, or the
+ *          corresponding  strings  for the current locale.  Noon is treated
+ *          as "PM" and midnight as "AM".
+ *   %P     Like %p but in lowercase: "am" or "pm" or a corresponding string
+ *          for the current locale. (GNU)
+ *   %s     The number of seconds since the Epoch, that is, since 1970-01-01
+ *          00:00:00 UTC. (TZ)
+ *   %S     The second as a decimal number (range 00 to 60).  (The range is
+ *          up to 60 to allow for occasional leap seconds.)
+ *   %t     A tab character. (SU)
+ *   %y     The year as a decimal number without a century (range 00 to 99).
+ *   %Y     The year as a decimal number including the century.
+ *   %%     A literal '%' character.
+ *
+ * Returned Value:
+ *   The strftime() function returns the number of characters placed in  the
+ *    array s, not including the terminating null byte, provided the string,
+ *    including the terminating null byte, fits.  Otherwise,  it returns 0,
+ *    and the contents of the array is undefined. 
+ *
+ ****************************************************************************/
+
+size_t strftime(char *s, size_t max, const char *format, const struct tm *tm)
+{
+  const char *str;
+  char       *dest   = s;
+  int         chleft = max;
+  int         value;
+  int         len;
+
+  while (*format && chleft > 0)
+    {
+      /* Just copy regular characters */
+
+      if (*format != '%')
+        {
+           *dest++ = *format++;
+           chleft--;
+           continue;
+        }
+
+      /* Handle the format character */
+
+       format++;
+       len   = 0;
+
+       switch (*format++)
+         {
+           /* %a: A three-letter abbreviation for the day of the week. */
+           /* %A: The full name for the day of the week. */
+
+           case 'a':
+           case 'A':
+             {
+               len = snprintf(dest, chleft, "Day"); /* Not supported */
+             }
+             break;
+           
+           /* %h: Equivalent to %b */
+
+           case 'h':
+
+           /* %b: The abbreviated month name according to the current locale. */
+
+           case 'b':
+             {
+               if (tm->tm_mon < 12)
+                 {
+                   str = g_abbrevmonthname[tm->tm_mon];
+                   len = snprintf(dest, chleft, "%s", str);
+                 }
+             }
+             break;
+
+           /* %B: The full month name according to the current locale. */
+
+           case 'B':
+             {
+               if (tm->tm_mon < 12)
+                 {
+                   str = g_monthname[tm->tm_mon];
+                   len = snprintf(dest, chleft, "%s", str);
+                 }
+             }
+             break;
+
+           /* %y: The year as a decimal number without a century (range 00 to 99). */
+
+           case 'y':
+
+           /* %C: The century number (year/100) as a 2-digit integer. */
+
+           case 'C':
+             {
+               len = snprintf(dest, chleft, "%02d", tm->tm_year % 100);
+             }
+             break;
+
+           /* %d: The day of the month as a decimal number (range 01 to 31). */
+
+           case 'd':
+             {
+               len = snprintf(dest, chleft, "%02d", tm->tm_mday);
+             }
+             break;
+
+           /* %e: Like %d, the day of the month as a decimal number, but a leading
+            * zero is replaced by a space.
+            */
+
+           case 'e':
+             {
+               len = snprintf(dest, chleft, "%2d", tm->tm_mday);
+             }
+             break;
+
+           /* %H: The hour as a decimal number using a 24-hour clock (range 00  to 23). */
+
+           case 'H':
+             {
+               len = snprintf(dest, chleft, "%02d", tm->tm_hour);
+             }
+             break;
+
+           /* %I: The  hour as a decimal number using a 12-hour clock (range 01 to 12). */
+
+           case 'I':
+             {
+               len = snprintf(dest, chleft, "%02d", tm->tm_hour % 12);
+             }
+             break;
+
+           /* %j: The day of the year as a decimal number (range 001 to 366). */
+
+           case 'j':
+             {
+               if (tm->tm_mon < 12)
+                 {
+                   value = clock_daysbeforemonth(tm->tm_mon, clock_isleapyear(tm->tm_year)) + tm->tm_mday;
+                   len   = snprintf(dest, chleft, "%03d", value);
+                 }
+             }
+             break;
+
+           /* %k: The hour (24-hour clock) as a decimal number (range  0  to  23);
+            * single digits are preceded by a blank.
+            */
+
+           case 'k':
+             {
+               len = snprintf(dest, chleft, "%2d", tm->tm_hour);
+             }
+             break;
+
+           /* %l: The  hour  (12-hour  clock) as a decimal number (range 1 to 12);
+            * single digits are preceded by a blank.
+            */
+
+           case 'l':
+             {
+               len = snprintf(dest, chleft, "%2d", tm->tm_hour % 12);
+             }
+             break;
+
+           /* %m: The month as a decimal number (range 01 to 12). */
+
+           case 'm':
+             {
+               len = snprintf(dest, chleft, "%02d", tm->tm_mon + 1);
+             }
+             break;
+
+           /* %M: The minute as a decimal number (range 00 to 59). */
+
+           case 'M':
+             {
+               len = snprintf(dest, chleft, "%02d", tm->tm_min);
+             }
+             break;
+
+           /* %n: A newline character. */
+
+           case 'n':
+             {
+               *dest = '\n';
+               len   = 1;
+             }
+             break;
+
+           /* %p: Either "AM" or "PM" according to the given time  value. */
+
+           case 'p':
+             {
+               if (tm->tm_hour >= 12)
+                 {
+                   str = "PM";
+                 }
+               else
+                 {
+                   str = "AM";
+                 }
+               len = snprintf(dest, chleft, "%s", str);
+             }
+             break;
+
+           /* %P: Like %p but in lowercase: "am" or "pm" */
+
+           case 'P':
+             {
+               if (tm->tm_hour >= 12)
+                 {
+                   str = "pm";
+                 }
+               else
+                 {
+                   str = "am";
+                 }
+               len = snprintf(dest, chleft, "%s", str);
+             }
+             break;
+
+           /* %s: The number of seconds since the Epoch, that is, since 1970-01-01
+            * 00:00:00 UTC.
+            */
+
+           case 's':
+             {
+               len = snprintf(dest, chleft, "%d", mktime(tm));
+             }
+             break;
+
+           /* %S: The second as a decimal number (range 00 to 60).  (The range  is
+            * up to 60 to allow for occasional leap seconds.)
+            */
+
+           case 'S':
+             {
+               len = snprintf(dest, chleft, "%02d", tm->tm_sec);
+             }
+             break;
+
+           /* %t: A tab character. */
+
+           case 't':
+             {
+               *dest = '\t';
+               len   = 1;
+             }
+             break;
+
+           /* %Y: The year as a decimal number including the century. */
+
+           case 'Y':
+             {
+               len = snprintf(dest, chleft, "%04d", tm->tm_year + 1900);
+             }
+             break;
+
+           /* %%:  A literal '%' character. */
+
+           case '%':
+             {
+               *dest = '%';
+               len   = 1;
+             }
+             break;
+        }
+
+      /* Update counts and pointers */
+
+      dest   += len;
+      chleft -= len;
+    }
+
+  return max - chleft;
+}
diff --git a/nuttx/lib/time/lib_time.c b/nuttx/lib/time/lib_time.c
new file mode 100644
index 000000000..106a04c36
--- /dev/null
+++ b/nuttx/lib/time/lib_time.c
@@ -0,0 +1,110 @@
+/****************************************************************************
+ * lib/time/lib_time.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/time.h>
+#include <time.h>
+
+#ifndef CONFIG_DISABLE_CLOCK
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+ 
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  time
+ *
+ * Description:
+ *   Get the current calendar time as a time_t object.  The function returns
+ *   this value, and if the argument is not a null pointer, the value is also
+ *   set to the object pointed by tloc.
+ *
+ *   Note that this function is just a thin wrapper around gettimeofday()
+ *   and is provided for compatibility.  gettimeofday() is the preffered way
+ *   to obtain system time.
+ *
+ * Parameters:
+ *   Pointer to an object of type time_t, where the time value is stored.
+ *   Alternativelly, this parameter can be a null pointer, in which case the
+ *   parameter is not used, but a time_t object is still returned by the
+ *   function.
+ *
+ * Return Value:
+ *   The current calendar time as a time_t object.  If the argument is not
+ *   a null pointer, the return value is the same as the one stored in the
+ *   location pointed by the argument.
+ *
+ *   If the function could not retrieve the calendar time, it returns a -1
+ *   value.
+ *
+ ****************************************************************************/
+
+time_t time(time_t *tloc)
+{
+  struct timeval tp;
+  int ret;
+
+  /* Get the current time from the system */
+
+  ret = gettimeofday(&tp, NULL);
+  if (ret == OK)
+    {
+      /* Return the seconds since the epoch */
+
+      if (tloc)
+        {
+          *tloc = tp.tv_sec;
+        }
+
+      return tp.tv_sec;
+    }
+
+  return (time_t)ERROR;
+}
+
+#endif /* !CONFIG_DISABLE_CLOCK */
diff --git a/nuttx/lib/unistd/Make.defs b/nuttx/lib/unistd/Make.defs
new file mode 100644
index 000000000..e1441a48d
--- /dev/null
+++ b/nuttx/lib/unistd/Make.defs
@@ -0,0 +1,49 @@
+############################################################################
+# lib/unistd/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Add the unistd C files to the build
+
+CSRCS += lib_getopt.c lib_getoptargp.c lib_getoptindp.c lib_getoptoptp.c
+
+ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
+ifneq ($(CONFIG_DISABLE_ENVIRON),y)
+CSRCS +=  lib_chdir.c lib_getcwd.c
+endif
+endif
+
+# Add the unistd directory to the build
+
+DEPPATH += --dep-path unistd
+VPATH += :unistd
diff --git a/nuttx/lib/unistd/lib_chdir.c b/nuttx/lib/unistd/lib_chdir.c
new file mode 100644
index 000000000..3dd1333ce
--- /dev/null
+++ b/nuttx/lib/unistd/lib_chdir.c
@@ -0,0 +1,179 @@
+/****************************************************************************
+ * lib/unistd/lib_chdir.c
+ *
+ *   Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: _trimdir
+ ****************************************************************************/
+
+#if 0
+static inline void _trimdir(char *path)
+{
+ /* Skip any trailing '/' characters (unless it is also the leading '/') */
+
+ int len = strlen(path) - 1;
+ while (len > 0 && path[len] == '/')
+   {
+      path[len] = '\0';
+      len--;
+   }
+}
+#else
+#  define _trimdir(p)
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: chdir
+ *
+ * Description:
+ *   The chdir() function causes the directory named by the pathname pointed
+ *   to by the 'path' argument to become the current working directory; that
+ *   is, the starting point for path searches for pathnames not beginning
+ *   with '/'.
+ *
+ * Input Parmeters:
+ *   path - A pointer to a directory to use as the new current working
+ *     directory
+ *
+ * Returned Value:
+ *   0(OK) on success; -1(ERROR) on failure with errno set appropriately:
+ *
+ *   EACCES
+ *     Search permission is denied for any component of the pathname.
+ *   ELOOP
+ *     A loop exists in symbolic links encountered during resolution of the
+ *     'path' argument OR more that SYMLOOP_MAX symbolic links in the
+ *     resolution of the 'path' argument.
+ *   ENAMETOOLONG
+ *     The length of the path argument exceeds PATH_MAX or a pathname component
+ *     is longer than NAME_MAX.
+ *   ENOENT
+ *     A component of 'path' does not name an existing directory or path is
+ *     an empty string.
+ *   ENOTDIR
+ *     A component of the pathname is not a directory.
+ *
+ ****************************************************************************/
+
+int chdir(FAR const char *path)
+{
+  struct stat buf;
+  char *oldpwd;
+  char *alloc;
+  int err;
+  int ret;
+
+  /* Verify the input parameters */
+
+  if (!path)
+    {
+      err = ENOENT;
+      goto errout;
+    }
+
+  /* Verify that 'path' refers to a directory */
+
+  ret = stat(path, &buf);
+  if (ret != 0)
+    {
+      err = ENOENT;
+      goto errout;
+    }
+
+  /* Something exists here... is it a directory? */
+
+  if (!S_ISDIR(buf.st_mode))
+    {
+      err = ENOTDIR;
+      goto errout;
+    }
+
+  /* Yes, it is a directory. Remove any trailing '/' characters from the path */
+
+  _trimdir(path);
+
+  /* Replace any preceding OLDPWD with the current PWD (this is to
+   * support 'cd -' in NSH)
+   */
+
+  sched_lock();
+  oldpwd = getenv("PWD");
+  if (!oldpwd)
+    {
+      oldpwd = CONFIG_LIB_HOMEDIR;
+    }
+
+  alloc = strdup(oldpwd);  /* kludge needed because environment is realloc'ed */
+  setenv("OLDPWD", alloc, TRUE);
+  lib_free(alloc);
+
+  /* Set the cwd to the input 'path' */
+
+  setenv("PWD", path, TRUE);
+  sched_unlock();
+  return OK;
+
+errout:
+  set_errno(err);
+  return ERROR;
+}
+#endif /* CONFIG_NFILE_DESCRIPTORS && !CONFIG_DISABLE_ENVIRON */
diff --git a/nuttx/lib/unistd/lib_getcwd.c b/nuttx/lib/unistd/lib_getcwd.c
new file mode 100644
index 000000000..b94823300
--- /dev/null
+++ b/nuttx/lib/unistd/lib_getcwd.c
@@ -0,0 +1,132 @@
+/****************************************************************************
+ * lib/unistd/lib_getcwd.c
+ *
+ *   Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getwcd
+ *
+ * Description:
+ *   getcwd() function places the absolute pathname of the current working
+ *   directory in the array pointed to by 'buf', and returns 'buf.' The
+ *   pathname copied to the array shall contain no components that are
+ *   symbolic links. The 'size' argument is the size in bytes of the
+ *   character array pointed to by the 'buf' argument.
+ *
+ * Input Parmeters:
+ *   buf - a pointer to the location in which the current working directory
+ *     pathaname is returned.
+ *   size - The size in bytes avaiable at 'buf'
+ *
+ * Returned Value:
+ *   Upon successful completion, getcwd() returns the 'buf' argument.
+ *   Otherwise, getcwd() returns a null pointer and sets errno to indicate
+ *   the error:
+ *
+ *   EINVAL
+ *     The 'size' argument is 0 or the 'buf' argument is NULL.
+ *   ERANGE
+ *     The size argument is greater than 0, but is smaller than the length
+ *     of the currrent working directory pathname +1.
+ *   EACCES
+ *     Read or search permission was denied for a component of the pathname.
+ *   ENOMEM
+ *  Insufficient storage space is available. 
+ *
+ ****************************************************************************/
+
+FAR char *getcwd(FAR char *buf, size_t size)
+{
+  char *pwd;
+
+  /* Verify input parameters */
+
+#ifdef CONFIG_DEBUG
+  if (!buf || !size)
+    {
+      set_errno(EINVAL);
+      return NULL;
+    }
+#endif
+
+  /* If no working directory is defined, then default to the home directory */
+
+  pwd = getenv("PWD");
+  if (!pwd)
+    {
+      pwd = CONFIG_LIB_HOMEDIR;
+    }
+
+  /* Verify that the cwd will fit into the user-provided buffer */
+
+  if (strlen(pwd) + 1 > size)
+    {
+      set_errno(ERANGE);
+      return NULL;
+    }
+
+  /* Copy the cwd to the user buffer */
+
+  strcpy(buf, pwd);
+  sched_unlock();
+  return buf;
+}
+#endif /* CONFIG_NFILE_DESCRIPTORS && !CONFIG_DISABLE_ENVIRON */
diff --git a/nuttx/lib/unistd/lib_getopt.c b/nuttx/lib/unistd/lib_getopt.c
new file mode 100644
index 000000000..832d28721
--- /dev/null
+++ b/nuttx/lib/unistd/lib_getopt.c
@@ -0,0 +1,269 @@
+/****************************************************************************
+ * lib/unistd/lib_getopt.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <unistd.h>
+#include <string.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+FAR char *optarg; /* Optional argument following option */
+int optind = 1;   /* Index into argv */
+int optopt = '?'; /* unrecognized option character */
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+static FAR char *g_optptr       = NULL;
+static bool      g_binitialized = false;
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getopt
+ *
+ * Description: getopt() parses command-line arguments.  Its arguments argc
+ *   and argv are the argument count and array as passed to the main()
+ *   function on program invocation.  An element of argv that starts with
+ *   '-' is an option element. The characters of this element (aside from
+ *   the initial '-') are option characters. If getopt() is called repeatedly,
+ *   it returns successively each of the option characters from each of the
+ *   option elements.
+ *
+ *   If getopt() finds another option character, it returns that character,
+ *   updating the external variable optind and a static variable nextchar so
+ *   that the next call to getopt() can resume the scan with the following
+ *   option character or argv-element.
+ *
+ *   If there are no more option characters, getopt() returns -1. Then optind
+ *   is the index in argv of the first argv-element that is not an option.
+ *
+ *   The 'optstring' argument is a string containing the legitimate option
+ *   characters. If such a character is followed by a colon, this indicates
+ *   that the option requires an argument.  If an argument is required for an
+ *   option so getopt() places a pointer to the following text in the same
+ *   argv-element, or the text of the following argv-element, in optarg.
+ *
+ *   NOTES:
+ *   1. opterr is not supported and this implementation of getopt() never
+ *      printfs error messages.
+ *   2. getopt is NOT threadsafe!
+ *   3. This version of getopt() does not reset global variables until
+ *      -1 is returned.  As a result, your command line parsing loops
+ *      must call getopt() repeatedly and continue to parse if other
+ *      errors are returned ('?' or ':') until getopt() finally returns -1.
+ *     (You can also set optind to -1 to force a reset).
+ *
+ * Return: If an option was successfully found, then getopt() returns the
+ *   option character. If all command-line options have been parsed, then
+ *   getopt() returns -1.  If getopt() encounters an option character that
+ *   was not in optstring, then '?' is returned. If getopt() encounters an
+ *   option with a missing argument, then the return value depends on the
+ *   first character in optstring: if it is ':', then ':' is returned;
+ *   otherwise '?' is returned.
+ *
+ ****************************************************************************/
+
+int getopt(int argc, FAR char *const argv[], FAR const char *optstring)
+{
+  if (argv && optstring && argc > 1)
+    {
+      int noarg_ret = '?';
+      char *optchar;
+
+      /* The inital value of optind is 1.  If getopt() is called again in the
+       * program, optind must be reset to some value <= 1.
+       */
+
+      if (optind < 1 || !g_binitialized)
+        {
+          optind         = 1;     /* Skip over the program name */
+          g_optptr       = NULL;  /* Start at the beginning of the first argument */
+          g_binitialized = true;  /* Now we are initialized */
+        }
+
+      /* If the first character of opstring s ':', then ':' is in the event of
+       * a missing argument. Otherwise '?' is returned.
+       */
+
+      if (*optstring == ':')
+        {
+           noarg_ret = ':';
+           optstring++;
+        }
+
+      /* Are we resuming in the middle, or at the end of a string of arguments?
+       * g_optptr == NULL means that we are started at the beginning of argv[optind];
+       * *g_optptr == \0 means that we are starting at the beginning of optind+1
+       */
+
+      while (!g_optptr || !*g_optptr)
+        {
+          /* We need to start at the beginning of the next argv. Check if we need
+           * to increment optind
+           */
+
+          if (g_optptr)
+            {
+              /* Yes.. Increment it and check for the case where where we have
+               * processed everything in the argv[] array.
+               */
+
+              optind++;
+            }
+
+          /* Check for the end of the argument list */
+
+          g_optptr = argv[optind];
+          if (!g_optptr)
+            {
+              /* There are no more arguments, we are finished */
+
+              g_binitialized = false;
+              return ERROR;
+            }
+
+          /* We are starting at the beginning of argv[optind].  In this case, the
+           * first character must be '-'
+           */
+
+          if (*g_optptr != '-')
+            {
+              /* The argument does not start with '-', we are finished */
+
+              g_binitialized = false;
+              return ERROR;
+            }
+
+          /* Skip over the '-' */
+
+          g_optptr++;
+        }
+
+        /* Special case handling of "-" and "-:" */
+
+        if (!*g_optptr)
+          {
+             optopt = '\0'; /* We'll fix up g_optptr the next time we are called */
+             return '?';
+          }
+
+        /* Handle the case of "-:" */
+
+        if (*g_optptr == ':')
+          {
+            optopt = ':';
+            g_optptr++;
+            return '?';
+          }
+
+        /* g_optptr now points at the next option and it is not something crazy.
+         * check if the option is in the list of valid options.
+         */
+
+        optchar = strchr(optstring, *g_optptr);
+        if (!optchar)
+          {
+            /* No this character is not in the list of valid options */
+
+            optopt = *g_optptr;
+            g_optptr++;
+            return '?';
+          }
+
+        /* Yes, the character is in the list of valid options.  Does it have an
+         * required argument?
+         */
+
+        if (optchar[1] != ':')
+          {
+            /* No, no arguments. Just return the character that we found */
+
+            g_optptr++;
+            return *optchar;
+          }
+
+        /* Yes, it has a required argument.  Is the required argument
+         * immediately after the command in this same argument?
+         */
+
+        if (g_optptr[1] != '\0')
+          {
+              /* Yes, return a pointer into the current argument */
+
+              optarg = &g_optptr[1];
+              optind++;
+              g_optptr = NULL;
+              return *optchar;
+          }
+
+        /* No.. is the optional argument the next argument in argv[] ? */
+
+        if (argv[optind+1] && *argv[optind+1] != '-')
+          {
+            /* Yes.. return that */
+
+            optarg = argv[optind+1];
+            optind += 2;
+            g_optptr = NULL;
+            return *optchar;
+          }
+
+        /* No argument was supplied */
+
+        optarg = NULL;
+        optopt = *optchar;
+        optind++;
+        return noarg_ret;
+    }
+
+  g_binitialized = false;
+  return ERROR;
+}
diff --git a/nuttx/lib/unistd/lib_getoptargp.c b/nuttx/lib/unistd/lib_getoptargp.c
new file mode 100644
index 000000000..98a485016
--- /dev/null
+++ b/nuttx/lib/unistd/lib_getoptargp.c
@@ -0,0 +1,73 @@
+/****************************************************************************
+ * lib/unistd/lib_getoptargp.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <unistd.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getoptargp
+ *
+ * Description:
+ *   Returns a pointer to optarg.  This function is only used for external
+ *   modules that need to access the base, global variable, optarg.
+ *
+ ****************************************************************************/
+
+FAR char **getoptargp(void)
+{
+  return &optarg;
+}
+
diff --git a/nuttx/lib/unistd/lib_getoptindp.c b/nuttx/lib/unistd/lib_getoptindp.c
new file mode 100644
index 000000000..7714f8e70
--- /dev/null
+++ b/nuttx/lib/unistd/lib_getoptindp.c
@@ -0,0 +1,73 @@
+/****************************************************************************
+ * lib/unistd/lib_getoptindp.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <unistd.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getoptindp
+ *
+ * Description:
+ *   Returns a pointer to optind.  This function is only used for external
+ *   modules that need to access the base, global variable, optind.
+ *
+ ****************************************************************************/
+
+int *getoptindp(void)
+{
+  return &optind;
+}
+
diff --git a/nuttx/lib/unistd/lib_getoptoptp.c b/nuttx/lib/unistd/lib_getoptoptp.c
new file mode 100644
index 000000000..4805b7ac3
--- /dev/null
+++ b/nuttx/lib/unistd/lib_getoptoptp.c
@@ -0,0 +1,73 @@
+/****************************************************************************
+ * lib/unistd/lib_getoptoptp.c
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <unistd.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getoptoptp
+ *
+ * Description:
+ *   Returns a pointer to optopt.  This function is only used for external
+ *   modules that need to access the base, global variable, optopt.
+ *
+ ****************************************************************************/
+
+int *getoptoptp(void)
+{
+  return &optopt;
+}
+