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Add avsprintf() 

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4365 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo 2012-02-03 17:31:08 +00:00
parent 3323e32588
commit c9d369441f
5 changed files with 159 additions and 56 deletions
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3
nuttx/ChangeLog
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@ -2442,5 +2442,6 @@
console (only a Telnet console) and SDIO is enabled. This configuration is
required because the STM3240G-EVAL board cannot simultaneously support
RS-232 and SDIO due to pin conflicts.
* lib/string/strcasestr.c: Add strcasestr().
* lib/string/lib_strcasestr.c: Add strcasestr().
* lib/stdio/lib_avsprintf.c: Add avsprintf().

1
nuttx/include/stdio.h
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@ -133,6 +133,7 @@ EXTERN int ungetc(int c, FAR FILE *stream);
EXTERN int vprintf(FAR const char *format, va_list ap);
EXTERN int vfprintf(FAR FILE *stream, const char *format, va_list ap);
EXTERN int vsprintf(FAR char *buf, const char *format, va_list ap);
EXTERN int avsprintf(FAR char **ptr, const char *fmt, va_list ap);
EXTERN int vsnprintf(FAR char *buf, size_t size, const char *format, va_list ap);
EXTERN int vsscanf(char *buf, const char *s, va_list ap);

6
nuttx/lib/stdio/Make.defs
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@ -1,8 +1,8 @@
############################################################################
# lib/stdio/Make.defs
#
# Copyright (C) 2011 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <spudmonkey@racsa.co.cr>
# 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
@ -35,7 +35,7 @@
STDIO_SRCS = 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_vsnprintf.c lib_libvsprintf.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

59
nuttx/lib/stdio/lib_asprintf.c
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@ -1,8 +1,8 @@
/****************************************************************************
* lib/stdio/lib_asprintf.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
* 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
@ -38,10 +38,7 @@
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "lib_internal.h"
#include <stdarg.h>
/****************************************************************************
* Pre-processor Definitions
@ -95,56 +92,14 @@
int asprintf (FAR char **ptr, const char *fmt, ...)
{
struct lib_outstream_s nulloutstream;
struct lib_memoutstream_s memoutstream;
FAR char *buf;
va_list ap;
int nbytes;
int ret;
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);
va_start(ap, fmt);
nbytes = lib_vsprintf((FAR struct lib_outstream_s *)&nulloutstream, fmt, ap);
va_end(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 */
/* Let avsprintf do all of the work */
va_start(ap, fmt);
nbytes = lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public, fmt, ap);
ret = avsprintf(ptr, fmt, ap);
va_end(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;
return ret;
}

146
nuttx/lib/stdio/lib_avsprintf.c Normal file
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@ -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;
}