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. */
35 int
fprintf(FILE * fp,const char * format,...)36 fprintf (FILE *fp, const char *format, ...)
37 {
38 char buf[2000];
39 char *output;
40 size_t len;
41 size_t lenbuf = sizeof (buf);
42 va_list args;
43
44 va_start (args, format);
45 output = vasnprintf (buf, &lenbuf, format, args);
46 len = lenbuf;
47 va_end (args);
48
49 if (!output)
50 {
51 fseterr (fp);
52 return -1;
53 }
54
55 if (fwrite (output, 1, len, fp) < len)
56 {
57 if (output != buf)
58 {
59 int saved_errno = errno;
60 free (output);
61 errno = saved_errno;
62 }
63 return -1;
64 }
65
66 if (output != buf)
67 free (output);
68
69 if (len > INT_MAX)
70 {
71 errno = EOVERFLOW;
72 fseterr (fp);
73 return -1;
74 }
75
76 return len;
77 }
78