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/*
* libcompat - system compatibility library
*
* Copyright © 2010 Guillem Jover <guillem@debian.org>
*
* This 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 2 of the License, or
* (at your option) any later version.
*
* This 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/>.
*/
#include <config.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include "compat.h"
int
vasprintf(char **strp, char const *fmt, va_list args)
{
va_list args_copy;
int needed, n;
char *str;
va_copy(args_copy, args);
needed = vsnprintf(NULL, 0, fmt, args_copy);
va_end(args_copy);
if (needed < 0 || needed >= INT_MAX) {
if (needed >= INT_MAX)
errno = EOVERFLOW;
*strp = NULL;
return -1;
}
str = malloc(needed + 1);
if (str == NULL) {
*strp = NULL;
return -1;
}
n = vsnprintf(str, needed + 1, fmt, args);
if (n < 0) {
free(str);
str = NULL;
}
*strp = str;
return n;
}
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