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  */
16 
17 #include <sys/types.h>
18 
19 #include <err.h>
20 #include <stdarg.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <stdlib.h>
24 
25 int
26 asprintf(char **ret, const char *fmt, ...)
27 {
28 	va_list	ap;
29 	int	n;
30 
31 	va_start(ap, fmt);
32 	n = vasprintf(ret, fmt, ap);
33 	va_end(ap);
34 
35 	return (n);
36 }
37 
38 int
39 vasprintf(char **ret, const char *fmt, va_list ap)
40 {
41 	int	 n;
42 	va_list  ap2;
43 
44 	va_copy(ap2, ap);
45 
46 	if ((n = vsnprintf(NULL, 0, fmt, ap)) < 0)
47 		goto error;
48 
49 	*ret = malloc(n + 1);
50 	if (*ret == NULL)
51 		errx(1, "vasprintf: malloc failed");
52 	if ((n = vsnprintf(*ret, n + 1, fmt, ap2)) < 0) {
53 		free(*ret);
54 		goto error;
55 	}
56 	va_end(ap2);
57 
58 	return (n);
59 
60 error:
61 	va_end(ap2);
62 	*ret = NULL;
63 	return (-1);
64 }