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/* Formatted output to strings.
Copyright (C) 2004, 2006-2026 Free Software Foundation, Inc.
Written by Simon Josefsson and Paul Eggert.
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 2.1 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/>. */
#include <config.h>
/* Specification. */
#include <stdio.h>
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "vasnprintf.h"
ptrdiff_t
snzprintf (char *str, size_t size, const char *format, ...)
{
va_list args;
va_start (args, format);
size_t lenbuf = size;
char *output = vasnprintf (str, &lenbuf, format, args);
size_t len = lenbuf;
va_end (args);
if (!output)
return -1;
if (output != str)
{
if (size)
{
size_t pruned_len = (len < size ? len : size - 1);
memcpy (str, output, pruned_len);
str[pruned_len] = '\0';
}
free (output);
}
if (len > PTRDIFF_MAX)
{
errno = ENOMEM;
return -1;
}
return len;
}
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