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/* vsprintf with automatic memory allocation in C locale.
Copyright (C) 2002-2004, 2007-2023 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 <https://www.gnu.org/licenses/>. */
#ifndef _C_VASNPRINTF_H
#define _C_VASNPRINTF_H
/* This file uses _GL_ATTRIBUTE_FORMAT. */
#if !_GL_CONFIG_H_INCLUDED
#error "Please include config.h first."
#endif
/* Get va_list. */
#include <stdarg.h>
/* Get size_t. */
#include <stddef.h>
/* Get _GL_ATTRIBUTE_SPEC_PRINTF_STANDARD. */
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
/* 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);
}
Formatting takes place in the C locale, that is, the decimal point used in
floating-point formatting directives is always '.'.
*/
extern char *c_vasnprintf (char *restrict resultbuf, size_t *lengthp,
const char *format, va_list args)
_GL_ATTRIBUTE_FORMAT ((_GL_ATTRIBUTE_SPEC_PRINTF_STANDARD, 3, 0));
#ifdef __cplusplus
}
#endif
#endif /* _C_VASNPRINTF_H */
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