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/* Formatted output to strings.
Copyright (C) 2004, 2006-2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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 <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include "vasnprintf.h"
ptrdiff_t
vszprintf (char *str, const char *format, va_list args)
{
char *output;
size_t len;
size_t lenbuf;
/* Set lenbuf = min (SIZE_MAX, - (uintptr_t) str - 1). */
lenbuf = SIZE_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 = ENOMEM;
return -1;
}
if (len > PTRDIFF_MAX)
{
errno = ENOMEM;
return -1;
}
return len;
}
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