summaryrefslogtreecommitdiff
path: root/lib/unistdio/ulc-vfprintf.c
blob: 586fe13af8d4f66cca4a44507ab6d18b2c22b782 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
/* Formatted output to a stream.
   Copyright (C) 2004, 2006-2008 Free Software Foundation, Inc.

   This program 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 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 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 <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

/* Specification.  */
#include "unistdio.h"

#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

#include "fseterr.h"

/* Print formatted output to the stream FP.
   Return string length of formatted string.  On error, return a negative
   value.  */
int
ulc_vfprintf (FILE *fp, const char *format, va_list args)
{
  char buf[2000];
  char *output;
  size_t len;
  size_t lenbuf = sizeof (buf);

  output = ulc_vasnprintf (buf, &lenbuf, format, args);
  len = lenbuf;

  if (!output)
    {
      fseterr (fp);
      return -1;
    }

  if (fwrite (output, 1, len, fp) < len)
    {
      if (output != buf)
	{
	  int saved_errno = errno;
	  free (output);
	  errno = saved_errno;
	}
      return -1;
    }

  if (len > INT_MAX)
    {
      errno = EOVERFLOW;
      fseterr (fp);
      return -1;
    }

  return len;
}