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comparison compat/asprintf.c @ 0:a7e41e1a79c8

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Initial revision
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Thu, 19 Jan 2017 22:39:51 +0100
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-1:000000000000 0:a7e41e1a79c8
1 /*
2 * Copyright (C) 2015 Guido Berhoerster <guido+pwm@berhoerster.name>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included
13 * in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <errno.h>
28
29 #include "asprintf.h"
30
31 int
32 vasprintf(char **strp, const char *fmt, va_list args)
33 {
34 int len;
35 va_list args_new;
36 char *str;
37
38 *strp = NULL;
39 va_copy(args_new, args);
40
41 len = vsnprintf(NULL, 0, fmt, args);
42 if (len < 0) {
43 goto out;
44 }
45
46 str = malloc(len + 1);
47 if (str == NULL) {
48 goto out;
49 }
50 len = vsnprintf(str, len + 1, fmt, args_new);
51 if (len < 0) {
52 free(str);
53 goto out;
54 }
55 *strp = str;
56 out:
57 va_end(args_new);
58
59 return (len);
60 }
61
62 int
63 asprintf(char **strp, const char *fmt, ...)
64 {
65 int len;
66 va_list args;
67
68 va_start(args, fmt);
69 len = vasprintf(strp, fmt, args);
70 va_end(args);
71
72 return (len);
73 }