Move lib/stdio/lib_fgets.c to apps/system/readline; simplify fgets(); use readline instead of fgets in NSH

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4356 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 100 insertions, 0 deletions

diff --git a/apps/include/readline.h b/apps/include/readline.h
new file mode 100644
index 000000000..a53eaf5f6
--- /dev/null
+++ b/apps/include/readline.h
@@ -0,0 +1,100 @@
+/****************************************************************************
+ * include/apps/readline.h
+ *
+ *   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.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_APPS_READLINE_H
+#define __INCLUDE_APPS_READLINE_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: readline
+ *
+ *   readline() reads in at most one less than 'buflen' characters from
+ *   'instream' and stores them into the buffer pointed to by 'buf'.
+ *   Characters are echoed on 'outstream'.  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.
+ *
+ *   This version of realine assumes that we are reading and writing to
+ *   a VT100 console.  This will not work well if 'instream' or 'outstream'
+ *   corresponds to a raw byte steam.
+ *
+ *   This function is inspired by the GNU readline but is an entirely
+ *   different creature.
+ *
+ * Input Parameters:
+ *   buf       - The user allocated buffer to be filled.
+ *   buflen    - the size of the buffer.
+ *   instream  - The stream to read characters from
+ *   outstream - The stream to each characters to.
+ *
+ * Returned values:
+ *   On success, the (positive) number of bytes transferred is returned.
+ *   A length of zero would indicated an end of file condition. An failure,
+ *   a negated errno value is returned.
+ *
+ **************************************************************************/
+
+EXTERN ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCLUDE_APPS_READLINE_H */