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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