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/* Formatted output to a stream.
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/>. */
#if 1
# include <config.h>
#endif
/* Specification. */
#include <stdio.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include "fseterr.h"
#include "intprops.h"
#include "vasnprintf.h"
off64_t
vfzprintf (FILE *fp, const char *format, va_list args)
{
char buf[2000];
char *output;
size_t len;
size_t lenbuf = sizeof (buf);
output = vasnprintf (buf, &lenbuf, format, args);
len = lenbuf;
if (!output)
{
fseterr (fp);
return -1;
}
if (len > TYPE_MAXIMUM (off64_t))
{
/* We could write the (huge) output, but then could not return len, as it
would be negative. Treat this case as if vasnprintf had already
encountered an out-of-memory situation. */
if (output != buf)
free (output);
fseterr (fp);
errno = ENOMEM;
return -1;
}
if (fwrite (output, 1, len, fp) < len)
{
if (output != buf)
free (output);
return -1;
}
if (output != buf)
free (output);
return len;
}
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