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1479465f GJ |
1 | /* |
2 | * libcompat - system compatibility library | |
3 | * | |
4 | * Copyright © 2010 Guillem Jover <guillem@debian.org> | |
5 | * | |
6 | * This is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | #include <stdarg.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | ||
26 | #include "compat.h" | |
27 | ||
28 | int | |
29 | vasprintf(char **strp, char const *fmt, va_list args) | |
30 | { | |
31 | va_list args_copy; | |
32 | int needed, n; | |
33 | char *str; | |
34 | ||
35 | va_copy(args_copy, args); | |
36 | needed = vsnprintf(NULL, 0, fmt, args_copy); | |
37 | va_end(args_copy); | |
38 | ||
39 | if (needed < 0) { | |
40 | *strp = NULL; | |
41 | return -1; | |
42 | } | |
43 | ||
44 | str = malloc(needed + 1); | |
45 | if (str == NULL) { | |
46 | *strp = NULL; | |
47 | return -1; | |
48 | } | |
49 | ||
50 | n = vsnprintf(str, needed + 1, fmt, args); | |
51 | if (n < 0) { | |
52 | free(str); | |
53 | str = NULL; | |
54 | } | |
55 | ||
56 | *strp = str; | |
57 | ||
58 | return n; | |
59 | } |