Blob


1 /*
2 * Copyright (c) 2006 Nicholas Marriott <nicholas.marriott@gmail.com>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
14 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
17 #include <sys/types.h>
19 #include <err.h>
20 #include <stdarg.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <stdlib.h>
25 int vasprintf(char **, const char *, va_list);
27 int
28 asprintf(char **ret, const char *fmt, ...)
29 {
30 va_list ap;
31 int n;
33 va_start(ap, fmt);
34 n = vasprintf(ret, fmt, ap);
35 va_end(ap);
37 return (n);
38 }
40 int
41 vasprintf(char **ret, const char *fmt, va_list ap)
42 {
43 int n;
44 va_list ap2;
46 va_copy(ap2, ap);
48 if ((n = vsnprintf(NULL, 0, fmt, ap)) < 0)
49 goto error;
51 *ret = malloc(n + 1);
52 if (*ret == NULL)
53 errx(1, "vasprintf: malloc failed");
54 if ((n = vsnprintf(*ret, n + 1, fmt, ap2)) < 0) {
55 free(*ret);
56 goto error;
57 }
58 va_end(ap2);
60 return (n);
62 error:
63 va_end(ap2);
64 *ret = NULL;
65 return (-1);
66 }