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/* Formatted output to strings.
Copyright (C) 2004, 2006-2019 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 of the License, 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/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/* Specification. */
#include <stdio.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include "vasnprintf.h"
#ifndef SIZE_MAX
# define SIZE_MAX ((size_t) -1)
#endif
/* Print formatted output to string STR.
Return string length of formatted string. On error, return a negative
value. */
int
vsprintf (char *str, const char *format, va_list args)
{
char *output;
size_t len;
size_t lenbuf;
/* vasnprintf fails with EOVERFLOW when the buffer size argument is larger
than INT_MAX (if that fits into a 'size_t' at all).
Also note that glibc's iconv fails with E2BIG when we pass a length that
is so large that str + lenbuf wraps around, i.e.
(uintptr_t) (str + lenbuf) < (uintptr_t) str.
Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */
lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX);
if (lenbuf > ~ (uintptr_t) str)
lenbuf = ~ (uintptr_t) str;
output = vasnprintf (str, &lenbuf, format, args);
len = lenbuf;
if (!output)
return -1;
if (output != str)
{
/* len is near SIZE_MAX. */
free (output);
errno = EOVERFLOW;
return -1;
}
if (len > INT_MAX)
{
errno = EOVERFLOW;
return -1;
}
return len;
}
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