|
421
|
1 /* Formatted output to strings.
|
|
|
2 Copyright (C) 2004, 2006-2010 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 }
|
