1 /* Formatted output to strings.
2 Copyright (C) 1999, 2002, 2006-2007 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 Lesser General Public License as published by
6 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 #include <config.h>
18
19 /* Specification. */
20 #ifdef IN_LIBASPRINTF
21 # include "vasprintf.h"
22 #else
23 # include <stdio.h>
24 #endif
25
26 #include <errno.h>
27 #include <limits.h>
28 #include <stdlib.h>
29
30 #include "vasnprintf.h"
31
32 /* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW. */
33 #ifndef EOVERFLOW
34 # define EOVERFLOW E2BIG
35 #endif
36
37 int
vasprintf(char ** resultp,const char * format,va_list args)38 vasprintf (char **resultp, const char *format, va_list args)
39 {
40 size_t length;
41 char *result = vasnprintf (NULL, &length, format, args);
42 if (result == NULL)
43 return -1;
44
45 if (length > INT_MAX)
46 {
47 free (result);
48 errno = EOVERFLOW;
49 return -1;
50 }
51
52 *resultp = result;
53 /* Return the number of resulting bytes, excluding the trailing NUL. */
54 return length;
55 }
56