1/* Formatted output to a stream.
2   Copyright (C) 2004, 2006-2012 Free Software Foundation, Inc.
3
4   This program is free software: you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17#if 1
18# include <config.h>
19#endif
20
21/* Specification.  */
22#include <stdio.h>
23
24#include <errno.h>
25#include <limits.h>
26#include <stdarg.h>
27#include <stdlib.h>
28
29#include "fseterr.h"
30#include "vasnprintf.h"
31
32/* Print formatted output to the stream FP.
33   Return string length of formatted string.  On error, return a negative
34   value.  */
35int
36vfprintf (FILE *fp, const char *format, va_list args)
37{
38  char buf[2000];
39  char *output;
40  size_t len;
41  size_t lenbuf = sizeof (buf);
42
43  output = vasnprintf (buf, &lenbuf, format, args);
44  len = lenbuf;
45
46  if (!output)
47    {
48      fseterr (fp);
49      return -1;
50    }
51
52  if (fwrite (output, 1, len, fp) < len)
53    {
54      if (output != buf)
55        {
56          int saved_errno = errno;
57          free (output);
58          errno = saved_errno;
59        }
60      return -1;
61    }
62
63  if (output != buf)
64    free (output);
65
66  if (len > INT_MAX)
67    {
68      errno = EOVERFLOW;
69      fseterr (fp);
70      return -1;
71    }
72
73  return len;
74}
75