Add asprintf()
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@3652 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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patacongo
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@ -1791,3 +1791,5 @@
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* lib/string/lib_strndup.c: Add standard strndup() library function.
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* net/getsockname.c: Added standard getsockname() to return the local
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address associated with a socket.
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* lib/stdio/lib_asprintf.c: Add asprintf()
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@ -125,6 +125,7 @@ EXTERN int printf(const char *format, ...);
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EXTERN int puts(FAR const char *s);
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EXTERN int rename(FAR const char *oldpath, FAR const char *newpath);
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EXTERN int sprintf(FAR char *buf, const char *format, ...);
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EXTERN int asprintf (FAR char **ptr, const char *fmt, ...);
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EXTERN int snprintf(FAR char *buf, size_t size, const char *format, ...);
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EXTERN int sscanf(const char *buf, const char *fmt, ...);
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@ -34,11 +34,11 @@
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############################################################################
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STDIO_SRCS = lib_fileno.c lib_printf.c lib_rawprintf.c lib_lowprintf.c \
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lib_sprintf.c lib_snprintf.c lib_libsprintf.c lib_vsprintf.c \
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lib_vsnprintf.c lib_libvsprintf.c lib_meminstream.c \
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lib_memoutstream.c lib_lowinstream.c lib_lowoutstream.c \
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lib_zeroinstream.c lib_nullinstream.c lib_nulloutstream.c \
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lib_sscanf.c
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lib_sprintf.c lib_asprintf.c lib_snprintf.c lib_libsprintf.c \
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lib_vsprintf.c lib_vsnprintf.c lib_libvsprintf.c \
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lib_meminstream.c lib_memoutstream.c lib_lowinstream.c \
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lib_lowoutstream.c lib_zeroinstream.c lib_nullinstream.c \
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lib_nulloutstream.c lib_sscanf.c
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ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
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STDIO_SRCS += lib_rawinstream.c lib_rawoutstream.c
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@ -0,0 +1,133 @@
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/****************************************************************************
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* lib/stdio/lib_asprintf.c
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "lib_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Global Constant Data
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Constant Data
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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/****************************************************************************
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* Name: asprintf
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*
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* Description:
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* This function is similar to sprintf, except that it dynamically
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* allocates a string (as with malloc) to hold the output, instead of
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* putting the output in a buffer you allocate in advance. The ptr
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* argument should be the address of a char * object, and a successful
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* call to asprintf stores a pointer to the newly allocated string at that
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* location.
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*
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* Returned Value:
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* The returned value is the number of characters allocated for the buffer,
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* or less than zero if an error occurred. Usually this means that the buffer
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* could not be allocated.
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*
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****************************************************************************/
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int asprintf (FAR char **ptr, const char *fmt, ...)
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{
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struct lib_outstream_s nulloutstream;
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struct lib_memoutstream_s memoutstream;
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FAR char *buf;
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va_list ap;
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int n;
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/* First, use a nullstream to get the size of the buffer */
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lib_nulloutstream(&nulloutstream);
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va_start(ap, fmt);
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n = lib_vsprintf((FAR struct lib_outstream_s *)&nulloutstream, fmt, ap);
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va_end(ap);
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/* Then allocate a buffer to hold that number of characters */
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buf = (FAR char *)malloc(nulloutstream.nput + 1);
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if (!buf)
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{
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return ERROR;
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}
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/* Initialize a memory stream to write into the allocated buffer */
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lib_memoutstream((FAR struct lib_memoutstream_s *)&memoutstream,
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buf, nulloutstream.nput);
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/* Then let lib_vsprintf do it real thing */
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va_start(ap, fmt);
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n = lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public, fmt, ap);
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va_end(ap);
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DEBUGASSERT(n < 0 || n == nulloutstream.nput);
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buf[nulloutstream.nput] = '\0';
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return n;
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}
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