1 /* Formatted output to a stream.
2 Copyright (C) 2004, 2006-2018 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 <https://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. */
35 int
vfprintf(FILE * fp,const char * format,va_list args)36 vfprintf (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