Mercurial > hg-old > index.cgi

comparison lib/vsnprintf.c @ 272:d5392bb5da3c 2.5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added generated files
author lost
date Sun, 16 Aug 2009 17:16:49 +0000
parents
children
comparison
equal deleted inserted replaced
271:3b793ba7a6c6 272:d5392bb5da3c
1 /* Formatted output to strings.
2 Copyright (C) 2004, 2006-2008 Free Software Foundation, Inc.
3 Written by Simon Josefsson and Yoann Vandoorselaere <yoann@prelude-ids.org>.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22
23 /* Specification. */
24 #include <stdio.h>
25
26 #include <errno.h>
27 #include <limits.h>
28 #include <stdarg.h>
29 #include <stdlib.h>
30 #include <string.h>
31
32 #include "vasnprintf.h"
33
34 /* Print formatted output to string STR. Similar to vsprintf, but
35 additional length SIZE limit how much is written into STR. Returns
36 string length of formatted string (which may be larger than SIZE).
37 STR may be NULL, in which case nothing will be written. On error,
38 return a negative value. */
39 int
40 vsnprintf (char *str, size_t size, const char *format, va_list args)
41 {
42 char *output;
43 size_t len;
44 size_t lenbuf = size;
45
46 output = vasnprintf (str, &lenbuf, format, args);
47 len = lenbuf;
48
49 if (!output)
50 return -1;
51
52 if (output != str)
53 {
54 if (size)
55 {
56 size_t pruned_len = (len < size ? len : size - 1);
57 memcpy (str, output, pruned_len);
58 str[pruned_len] = '\0';
59 }
60
61 free (output);
62 }
63
64 if (len > INT_MAX)
65 {
66 errno = EOVERFLOW;
67 return -1;
68 }
69
70 return len;
71 }