PIPS
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#include <stdarg.h>
#include <stddef.h>
Go to the source code of this file.
Macros | |
#define | _GL_ATTRIBUTE_FORMAT(spec) /**empty */ |
vsprintf with automatic memory allocation. More... | |
Functions | |
char * | asnprintf (char *resultbuf, size_t *lengthp, const char *format,...) _GL_ATTRIBUTE_FORMAT((__printf__ |
Write formatted output to a string dynamically allocated with malloc(). More... | |
char char * | vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args) _GL_ATTRIBUTE_FORMAT((__printf__ |
#define _GL_ATTRIBUTE_FORMAT | ( | spec | ) | /**empty */ |
vsprintf with automatic memory allocation.
Copyright (C) 2002-2004, 2007-2014 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, see http://www.gnu.org/licenses/.
Get va_list.
Get size_t.
The attribute feature is available in gcc versions 2.5 and later. The -protected variants of the attributes 'format' and 'printf' are accepted by gcc versions 2.6.4 (effectively 2.7) and later. We enable _GL_ATTRIBUTE_FORMAT only if these are supported too, because gnulib and libintl do '#define printf __printf' when they override the 'printf' function.
Definition at line 35 of file vasnprintf.h.
char* asnprintf | ( | char * | resultbuf, |
size_t * | lengthp, | ||
const char * | format, | ||
... | |||
) |
Write formatted output to a string dynamically allocated with malloc().
You can pass a preallocated buffer for the result in RESULTBUF and its size in *LENGTHP; otherwise you pass RESULTBUF = NULL. If successful, return the address of the string (this may be = RESULTBUF if no dynamic memory allocation was necessary) and set *LENGTHP to the number of resulting bytes, excluding the trailing NUL. Upon error, set errno and return NULL.
When dynamic memory allocation occurs, the preallocated buffer is left alone (with possibly modified contents). This makes it possible to use a statically allocated or stack-allocated buffer, like this:
char buf[100]; size_t len = sizeof (buf); char *output = vasnprintf (buf, &len, format, args); if (output == NULL) ... error handling ...; else { ... use the output string ...; if (output != buf) free (output); }
char char* vasnprintf | ( | char * | resultbuf, |
size_t * | lengthp, | ||
const char * | format, | ||
va_list | args | ||
) |