Add tools/cmpconfig.c to compare to configuration files

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4592 42af7a65-404d-4744-a932-0658087f49c3

10 files changed, 636 insertions, 24 deletions

diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog
index da3106df8..8adb64da7 100644
--- a/nuttx/ChangeLog
+++ b/nuttx/ChangeLog
@@ -2635,10 +2635,14 @@
 	  drivers/Kconfig, drivers/mtd/Kconfig, drivers/input/Kconfig
 	  drivers/analog/Kconfig, drivers/lcd/Kconfig:  Updated kernel
 	  configuration support provided by Lzyy.
+	* Kconfig:  Many more Kconfig updates (no longer tracking in the ChangeLog)
 	* arch/arm/src/Makefile, arch/x86/src/Makefile, arch/avr/src/Makefile,
 	  arch/mips/src/Makefile, arch/sim/src/Makefile, arch/hc/src/Makefile,
 	  arch/sh/src/Makefile:  The libgcc.a in newer versions of GCC now
 	  have an dependency on an external implementation of export().  This
 	  required modification to the Makefiles that do the final link:  Now
 	  libgcc.a must be included within the group of libraries that are
-	  search recursively.
\ No newline at end of file
+	  search recursively.
+	* arch/arm/srm/stm32/stm32_otgfsdev.c:  A USB OTG FS device-side driver
+	  for the STM32 F4 (and maybe F2 and F1 connectivity line).
+	* tools/cmpconfig.c:  A tool for comparing two configuration files.
diff --git a/nuttx/Kconfig b/nuttx/Kconfig
index 7bc036be3..085bae881 100644
--- a/nuttx/Kconfig
+++ b/nuttx/Kconfig
@@ -249,12 +249,9 @@ menu "Device Drivers"
 source drivers/Kconfig
 endmenu
 
-menuconfig NET
-	bool "Networking support"
-	default n
-if NET
+menu "Networking support"
 source net/Kconfig
-endif
+endmenu
 
 menu "File systems"
 source fs/Kconfig
diff --git a/nuttx/Makefile b/nuttx/Makefile
index e2a7e76c7..ab6886ae9 100644
--- a/nuttx/Makefile
+++ b/nuttx/Makefile
@@ -605,5 +605,5 @@ ifneq ($(APPDIR),)
 endif
 
 menuconfig:
-	APPSDIR=${CONFIG_APPS_DIR} mconf Kconfig
+	@APPSDIR=${CONFIG_APPS_DIR} mconf Kconfig
 
diff --git a/nuttx/arch/arm/src/stm32/stm32_otgfsdev.c b/nuttx/arch/arm/src/stm32/stm32_otgfsdev.c
index 948ee4510..f84f289d9 100755
--- a/nuttx/arch/arm/src/stm32/stm32_otgfsdev.c
+++ b/nuttx/arch/arm/src/stm32/stm32_otgfsdev.c
@@ -1153,7 +1153,8 @@ static void stm32_epin_request(FAR struct stm32_usbdev_s *priv,
       usbtrace(TRACE_COMPLETE(privep->epphy), privreq->req.xfrd);
       stm32_req_complete(privep, OK);
 
-      privep->zlp    = false;
+      /* The endpoint is no longer transferring data */
+
       privep->active = false;
     }
 }
diff --git a/nuttx/net/Kconfig b/nuttx/net/Kconfig
index ae2bf3130..80eda5721 100644
--- a/nuttx/net/Kconfig
+++ b/nuttx/net/Kconfig
@@ -2,3 +2,276 @@
 # For a description of the syntax of this configuration file,
 # see misc/tools/kconfig-language.txt.
 #
+
+config NET
+	bool "Networking support"
+	default n
+	---help---
+		Enable or disable all network features
+
+if NET
+
+config NET_NOINTS
+	bool "Not interrupt driven"
+	default n
+	---help---
+		NET_NOINT indicates that uIP not called from the interrupt level. 
+		If NET_NOINTS is defined, critical sections will be managed with semaphores;
+		Otherwise, it assumed that uIP will be called from interrupt level handling
+		and critical sections will be managed by enabling and disabling interrupts.
+
+config NET_MULTIBUFFER
+	bool "Use multiple device-side I/O buffers"
+	default n
+	---help---
+		Traditionally, uIP has used a single buffer for all incoming and
+		outgoing traffic.  If this configuration is selected, then the
+		driver can manage multiple I/O buffers and can, for example,
+		be filling one input buffer while sending another output buffer.
+		Or, as another example, the driver may support queuing of concurrent
+		input/ouput and output transfers for better performance.
+
+config NET_IPv6
+	bool "IPv6"
+	default n
+	---help---
+		Build in support for IPv6.  Not fully implemented.
+
+config NSOCKET_DESCRIPTORS
+	int "Number of socket descriptor"
+	default 8
+	---help---
+		Maximum number of socket descriptors per task/thread.
+
+config NET_NACTIVESOCKETS
+	int "Max socket operations"
+	---help---
+		Maximum number of concurrent socket operations (recv, send, etc.).
+		Default: NET_TCP_CONNS+NET_UCP_CONNS
+
+config NET_SOCKOPTS
+	bool "Socket options"
+	default n
+	---help---
+		Enable or disable support for socket options
+
+config NET_BUFSIZE
+	int "Network packet size"
+	default 562 if !NET_TCP && NET_UDP && !NET_SLIP
+	default 420 if NET_TCP && !NET_UDP && !NET_SLIP
+	default 296 if NET_SLIP
+	---help---
+		uIP buffer size.  Default: 562
+
+config NET_TCPURGDATA
+	bool "Urgent data"
+	default n
+	---help---
+		Determines if support for TCP urgent data notification should be
+		compiled in. Urgent data (out-of-band data) is a rarely used TCP feature
+		that is very seldom would be required.
+
+config NET_TCP
+	bool "TCP/IP Networking"
+	default n
+	---help---
+		TCP support on or off
+
+endif
+
+if NET_TCP
+config NET_TCP_CONNS
+	int "Number of TCP/IP connections"
+	default 8
+	---help---
+		Maximum number of TCP/IP connections (all tasks)
+
+config NET_MAX_LISTENPORTS
+	bool "Number of listening ports"
+	default n
+	---help---
+		Maximum number of listening TCP/IP ports (all tasks)
+
+config NET_TCP_READAHEAD_BUFSIZE
+	bool "TCP/IP read-ahead buffer size"
+	default 562
+	---help---
+		Size of TCP/IP read-ahead buffers
+
+config NET_NTCP_READAHEAD_BUFFERS
+	int "Number of TCP/IP read-ahead buffers"
+	default 8
+	---help---
+		Number of TCP/IP read-ahead buffers (may be zero)
+
+config NET_TCPBACKLOG
+	bool "TCP/IP backlog support"
+	default n
+	---help---
+		Incoming connections pend in a backlog until accept() is called.
+		The size of the backlog is selected when listen() is called.
+
+endif
+
+config NET_UDP
+	bool "UDP Networking"
+	default n
+	depends on NET
+	---help---
+		Enable or disable UDP networking support.
+
+if NET_UDP
+config NET_UDP_CHECKSUMS
+	bool "UDP checksums"
+	default n
+	---help---
+		Enable/disable UDP checksum support
+
+config NET_UDP_CONNS
+	int "Number of UDP sockets"
+	default 8
+	---help---
+		The maximum amount of open concurrent UDP sockets
+
+endif
+
+config NET_ICMP
+	bool "ICMP networking support"
+	default n
+	depends on NET
+	---help---
+		Enable minimal ICMP support. Includes built-in support
+		for sending replies to received ECHO (ping) requests.
+
+if NET_ICMP
+config NET_ICMP_PING
+	bool "ICMP ping interfaces"
+	default n
+	---help---
+		Provide interfaces to support application level support for
+		for sending ECHO (ping) requests and associating ECHO replies.
+
+config NET_PINGADDRCONF
+	bool "Ping address configuration"
+	default n
+	---help---
+		Use "ping" packet for setting IP address
+
+endif
+
+config NET_IGMP
+	bool "IGMPv2 clientsupport"
+	default n
+	depends on NET
+	---help---
+		Enable IGMPv2 client support.
+
+if NET_IGMP
+config PREALLOC_IGMPGROUPS
+	int "Number of pre-allocated IGMP groups"
+	default 4
+	---help---
+		Pre-allocated IGMP groups are used only if needed from interrupt
+		level group created (by the IGMP server). Default: 4.
+
+endif
+
+if NET
+
+config NET_STATISTICS
+	bool "Collect network statistics"
+	default n
+	---help---
+		uIP statistics on or off
+
+config NET_RECEIVE_WINDOW
+	int "Receive window size"
+	---help---
+		The size of the advertised receiver's window
+
+config NET_ARPTAB_SIZE
+	int "ARP table size"
+	default 16
+	---help---
+		The size of the ARP table
+
+config NET_ARP_IPIN
+	bool "ARP address harvesting"
+	default n
+	---help---
+		Harvest IP/MAC address mappings from the ARP table
+		from incoming IP packets.
+
+endif
+if NET_UDP
+
+config NET_BROADCAST
+	bool "UDP broadcast Rx support"
+	default n
+	---help---
+		Incoming UDP broadcast support
+
+endif
+if NET
+
+config NET_MULTICAST
+	bool "Multi-cast Tx support"
+	default n
+	---help---
+		Outgoing multi-cast address support
+
+config NET_FWCACHE_SIZE
+	int "FW cache size"
+	---help---
+		Number of packets to remember when looking for duplicates
+
+config NET_SLIP
+	bool "SLIP support"
+	default n
+	---help---
+		Enables building of the SLIP driver. SLIP requires
+		at least one IP protocol selected and the following additional
+		network settings: NET_NOINTS and NET_MULTIBUFFER.
+
+		NET_BUFSIZE *must* be set to 296.  Other optional configuration
+		settings that affect the SLIP driver: NET_STATISTICS. 
+		Default: Ethernet
+
+		SLIP supports point-to-point IP communications over a serial port.
+		The default data link layer for uIP is Ethernet. If NET_SLIP is
+		defined in the NuttX configuration file, then SLIP will be supported.
+		The basic differences between the SLIP and Ethernet configurations is
+		that when SLIP is selected: 
+		
+		* The link level header (that comes before the IP header) is omitted. 
+		* All MAC address processing is suppressed. 
+		* ARP is disabled.
+		
+		If NET_SLIP is not selected, then Ethernet will be used (there is
+		no need to define anything special in the configuration file to use
+		Ethernet -- it is the default). 
+
+endif
+if NET_SLIP
+
+config SLIP_NINTERFACES 
+	int "Number of SLIP interfaces"
+	default 1
+	---help---
+		Selects the number of physical SLIP
+		interfaces to support.  
+		Default: 1
+
+config SLIP_STACKSIZE
+	int "SLIP stack size"
+	default 2048
+	---help---
+		Select the stack size of the SLIP RX and TX tasks.  Default: 2048
+
+config SLIP_DEFPRIO
+	int "SLIP priority"
+	default 128
+	---help---
+		The priority of the SLIP RX and TX tasks. Default: 128
+
+endif
diff --git a/nuttx/tools/Makefile.host b/nuttx/tools/Makefile.host
index 2384697b2..cf421aa3b 100644
--- a/nuttx/tools/Makefile.host
+++ b/nuttx/tools/Makefile.host
@@ -1,8 +1,8 @@
 ############################################################################
 # Makefile.host
 #
-#   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
-#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#   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
@@ -46,6 +46,11 @@ CFLAGS = -O2 -Wall -I.
 mkconfig: mkconfig.c cfgparser.c
 	@gcc $(CFLAGS) -o mkconfig mkconfig.c cfgparser.c
 
+# cmpconfig - Compare the contents of two configuration files
+
+cmpconfig: cmpconfig.c
+	@gcc $(CFLAGS) -o cmpconfig cmpconfig.c
+
 # mkversion - Convert a .version file into a C version.h file
 
 mkversion: mkconfig.c cfgparser.c
diff --git a/nuttx/tools/README.txt b/nuttx/tools/README.txt
index e859e8735..b4368aff9 100755
--- a/nuttx/tools/README.txt
+++ b/nuttx/tools/README.txt
@@ -19,7 +19,7 @@ configure.sh
 
 mkconfig.c, cfgparser.c, and cfgparser.h
 
-  This is C file that is used to build mkconfig program.  The mkconfig
+  These are Cs file that are used to build mkconfig program.  The mkconfig
   program is used during the initial NuttX build.
 
   When you configure NuttX, you will copy a configuration file called .config
@@ -31,6 +31,11 @@ mkconfig.c, cfgparser.c, and cfgparser.h
   into include/nuttx/config.h.  config.h is a another version of the
   NuttX configuration that can be included by C files.
 
+cmdconfig.c
+
+  This C file can be used to build a utility for comparing two NuttX
+  configuration files.
+
 mkexport.sh and Makefile.export
 
   These implement part of the top-level Makefile's 'export' target.  That
@@ -136,10 +141,10 @@ bdf-convert.c
 
        genfontsources:
          ifeq ($(CONFIG_NXFONT_SANS23X27),y)
-	      @$(MAKE) -C nxfonts -f Makefile.sources TOPDIR=$(TOPDIR) NXFONTS_FONTID=1 EXTRADEFINES=$(EXTRADEFINES)
+          @$(MAKE) -C nxfonts -f Makefile.sources TOPDIR=$(TOPDIR) NXFONTS_FONTID=1 EXTRADEFINES=$(EXTRADEFINES)
         endif
          ifeq ($(CONFIG_NXFONT_MYFONT),y)
-	      @$(MAKE) -C nxfonts -f Makefile.sources TOPDIR=$(TOPDIR) NXFONTS_FONTID=2 EXTRADEFINES=$(EXTRADEFINES)
+          @$(MAKE) -C nxfonts -f Makefile.sources TOPDIR=$(TOPDIR) NXFONTS_FONTID=2 EXTRADEFINES=$(EXTRADEFINES)
         endif
 
     6. nuttx/graphics/nxfonts/Make.defs.  Set the make variable NXFSET_CSRCS.
@@ -147,10 +152,10 @@ bdf-convert.c
        NXFONTS_FONTID=2:
 
        ifeq ($(CONFIG_NXFONT_SANS23X27),y)
-       NXFSET_CSRCS	+= nxfonts_bitmaps_sans23x27.c
+       NXFSET_CSRCS    += nxfonts_bitmaps_sans23x27.c
        endif
        ifeq ($(CONFIG_NXFONT_MYFONT),y)
-       NXFSET_CSRCS	+= nxfonts_bitmaps_myfont.c
+       NXFSET_CSRCS    += nxfonts_bitmaps_myfont.c
        endif
 
     7. nuttx/graphics/nxfonts/Makefile.sources.  This is the Makefile used
@@ -161,12 +166,12 @@ bdf-convert.c
        was used in nuttx/graphics/nxfonts/Make.defs):
 
        ifeq ($(NXFONTS_FONTID),1)
-       NXFONTS_PREFIX	:= g_sans23x27_
-       GEN_CSRC	= nxfonts_bitmaps_sans23x27.c
+       NXFONTS_PREFIX    := g_sans23x27_
+       GEN_CSRC    = nxfonts_bitmaps_sans23x27.c
        endif
        ifeq ($(NXFONTS_FONTID),2)
-       NXFONTS_PREFIX	:= g_myfont_
-       GEN_CSRC	= nxfonts_bitmaps_myfont.c
+       NXFONTS_PREFIX    := g_myfont_
+       GEN_CSRC    = nxfonts_bitmaps_myfont.c
        endif
 
     8. graphics/nxfonts/nxfonts_bitmaps.c.  This is the file that contains
@@ -212,8 +217,12 @@ bdf-convert.c
 Makefile.host
 
   This is the makefile that is used to make the mkconfig program from
-  the mkconfig.c C file, the mkversion program from the mkconfig.c C file,
-  or the mksyscall program from the mksyscall.c file.
+  the mkconfig.c C file, the cmpconfig program from cmpconfig.c C file
+  the mkversion program from the mkconfig.c C file, or the mksyscall
+  program from the mksyscall.c file.  Usage:
+
+  cd tools/
+  make -f Makefile.host <program>
 
 mkromfsimg.sh
 
diff --git a/nuttx/tools/cfgparser.c b/nuttx/tools/cfgparser.c
index 2917a2f60..655fac573 100644
--- a/nuttx/tools/cfgparser.c
+++ b/nuttx/tools/cfgparser.c
@@ -1,8 +1,8 @@
 /****************************************************************************
  * tools/cfgpaser.c
  *
- *   Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/nuttx/tools/cmpconfig.c b/nuttx/tools/cmpconfig.c
new file mode 100644
index 000000000..1c4cbfe1b
--- /dev/null
+++ b/nuttx/tools/cmpconfig.c
@@ -0,0 +1,323 @@
+/****************************************************************************
+ * tools/cmpconfig.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 <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct variable_s
+{
+  struct variable_s *flink;
+  char *var;
+  char *val;
+  char storage[1];
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static void show_usage(const char *progname)
+{
+  fprintf(stderr, "USAGE: %s <config1> <config2>\n", progname);
+  exit(EXIT_FAILURE);
+}
+
+static char *skip_space(char *ptr)
+{
+  while (*ptr && isspace((int)*ptr)) ptr++;
+  return ptr;
+}
+
+static char *read_line(FILE *stream, char *line, int len)
+{
+  char *ptr;
+
+  for (;;)
+    {
+      line[len-1] = '\0';
+      if (!fgets(line, len, stream))
+        {
+          return NULL;
+        }
+      else
+        {
+          ptr = skip_space(line);
+          if (*ptr && *ptr != '#' && *ptr != '\n')
+            {
+              return ptr;
+            }
+        }
+    }
+}
+
+static char *find_name_end(char *ptr)
+{
+  while (*ptr && (isalnum((int)*ptr) || *ptr == '_')) ptr++;
+  return ptr;
+}
+
+static char *find_value_end(char *ptr)
+{
+  while (*ptr && !isspace((int)*ptr))
+    {
+      if (*ptr == '"')
+        {
+           do ptr++; while (*ptr && *ptr != '"');
+           if (*ptr) ptr++;
+        }
+      else
+        {
+           do ptr++; while (*ptr && !isspace((int)*ptr) && *ptr != '"');
+        }
+    }
+  return ptr;
+}
+
+static void parse_line(char *ptr, char **varname, char **varval)
+{
+  *varname = ptr;
+  *varval = NULL;
+
+   ptr = find_name_end(ptr);
+   if (*ptr && *ptr != '=')
+    {
+      *ptr = '\0';
+       ptr = skip_space(ptr + 1);
+    }
+
+  if (*ptr == '=')
+    {
+      *ptr = '\0';
+      ptr = skip_space(ptr + 1);
+      if (*ptr)
+        {
+          *varval = ptr;
+          ptr = find_value_end(ptr);
+          *ptr = '\0';
+        }
+    }
+}
+
+static void parse_file(FILE *stream, struct variable_s **list)
+{
+  char line[10242];
+  struct variable_s *curr;
+  struct variable_s *prev;
+  struct variable_s *next;
+  char *varname;
+  char *varval;
+  char *ptr;
+
+  do
+    {
+      ptr = read_line(stream, line, 1024);
+      if (ptr)
+        {
+          parse_line(ptr, &varname, &varval);
+          if (varname)
+            {
+              int varlen = strlen(varname) + 1;
+              int vallen = 0;
+
+              if (varval)
+                {
+                  vallen = strlen(varval) + 1;
+                }
+
+              curr = (struct variable_s *)malloc(sizeof(struct variable_s) + varlen + vallen - 1);
+              if (curr)
+                {
+                  curr->var = &curr->storage[0];
+                  strcpy(curr->var, varname);
+
+                  curr->val = NULL;
+                  if (varval)
+                    {
+                      curr->val = &curr->storage[varlen];
+                      strcpy(curr->val, varval);
+                    }
+                }
+
+              prev = 0;
+              next = *list;
+              while (next && strcmp(next->var, curr->var) <= 0)
+                {
+                  prev = next;
+                  next = next->flink;
+                }
+
+              if (prev)
+                {
+                  prev->flink = curr;
+                }
+              else
+                {
+                  *list = curr;
+                }
+              curr->flink = next;
+            }
+        }
+    }
+  while (ptr);
+}
+
+static void compare_variables(struct variable_s *list1, struct variable_s *list2)
+{
+  char *varval1;
+  char *varval2;
+
+  while (list1 || list2)
+    {
+      if (list1->val)
+        {
+          varval1 = list1->val;
+        }
+      else
+        {
+          varval1 = "<NULL>";
+        }
+
+      if (list2->val)
+        {
+          varval2 = list2->val;
+        }
+      else
+        {
+          varval2 = "<NULL>";
+        }
+
+      if (!list1)
+        {
+          printf("file1:\n");
+          printf("file2: %s=%s\n\n", list2->var, varval2);
+          list2 = list2->flink;
+        }
+      else if (!list2)
+        {
+          printf("file1: %s=%s\n", list1->var, varval1);
+          printf("file2:\n\n");
+          list1 = list1->flink;
+        }
+      else
+        {
+          int result = strcmp(list1->var, list2->var);
+          if (result < 0)
+            {
+              printf("file1: %s=%s\n", list1->var, varval1);
+              printf("file2:\n\n");
+              list1 = list1->flink;
+            }
+          else if (result > 0)
+            {
+              printf("file1:\n");
+              printf("file2: %s=%s\n\n", list2->var, varval2);
+              list2 = list2->flink;
+            }
+          else
+            {
+              int result = strcmp(varval1, varval2);
+              if (result != 0)
+                {
+                  printf("file1: %s=%s\n", list1->var, varval1);
+                  printf("file2: %s=%s\n\n", list2->var, varval2);
+                }
+
+              list1 = list1->flink;
+              list2 = list2->flink;
+            }
+        }
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int main(int argc, char **argv, char **envp)
+{
+  struct variable_s *list1 = 0;
+  struct variable_s *list2 = 0;
+  FILE *stream1;
+  FILE *stream2;
+
+  if (argc != 3)
+    {
+      fprintf(stderr, "Unexpected number of arguments: %d\n\n", argc);
+      show_usage(argv[0]);
+    }
+
+  stream1 = fopen(argv[1], "r");
+  if (!stream1)
+    {
+      fprintf(stderr, "Failed to open %s for reading: %s\n\n",
+        argv[1], strerror(errno));
+      show_usage(argv[0]);
+    }
+
+  stream2 = fopen(argv[2], "r");
+  if (!stream2)
+    {
+      fprintf(stderr, "Failed to open %s for reading: %s\n\n",
+        argv[2], strerror(errno));
+      show_usage(argv[0]);
+    }
+
+  parse_file(stream1, &list1);
+  parse_file(stream2, &list2);
+
+  fclose(stream1);
+  fclose(stream2);
+
+  printf("Comparing:\n\n");
+  printf("  file1 = %s\n", argv[1]);
+  printf("  file2 = %s\n\n", argv[2]);
+  compare_variables(list1, list2);
+  return EXIT_SUCCESS;
+}
diff --git a/nuttx/tools/mkconfig.c b/nuttx/tools/mkconfig.c
index 7e3162b8f..5bacb24a6 100644
--- a/nuttx/tools/mkconfig.c
+++ b/nuttx/tools/mkconfig.c
@@ -88,7 +88,7 @@ int main(int argc, char **argv, char **envp)
       exit(2);
     }
 
-  stream= fopen(filepath, "r");
+  stream = fopen(filepath, "r");
   if (!stream)
     {
       fprintf(stderr, "open %s failed: %s\n", filepath, strerror(errno));