1 dd038bc6 2021-09-21 thomas.ad /*
 2 dd038bc6 2021-09-21 thomas.ad  * Copyright (c) 2006 Nicholas Marriott <nicholas.marriott@gmail.com>
 3 dd038bc6 2021-09-21 thomas.ad  *
 4 dd038bc6 2021-09-21 thomas.ad  * Permission to use, copy, modify, and distribute this software for any
 5 dd038bc6 2021-09-21 thomas.ad  * purpose with or without fee is hereby granted, provided that the above
 6 dd038bc6 2021-09-21 thomas.ad  * copyright notice and this permission notice appear in all copies.
 7 dd038bc6 2021-09-21 thomas.ad  *
 8 dd038bc6 2021-09-21 thomas.ad  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9 dd038bc6 2021-09-21 thomas.ad  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 dd038bc6 2021-09-21 thomas.ad  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 dd038bc6 2021-09-21 thomas.ad  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 dd038bc6 2021-09-21 thomas.ad  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
13 dd038bc6 2021-09-21 thomas.ad  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
14 dd038bc6 2021-09-21 thomas.ad  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 dd038bc6 2021-09-21 thomas.ad  */
16 dd038bc6 2021-09-21 thomas.ad 
17 dd038bc6 2021-09-21 thomas.ad #include <sys/types.h>
18 dd038bc6 2021-09-21 thomas.ad 
19 dd038bc6 2021-09-21 thomas.ad #include <err.h>
20 dd038bc6 2021-09-21 thomas.ad #include <stdarg.h>
21 dd038bc6 2021-09-21 thomas.ad #include <stdio.h>
22 dd038bc6 2021-09-21 thomas.ad #include <string.h>
23 dd038bc6 2021-09-21 thomas.ad #include <stdlib.h>
24 dd038bc6 2021-09-21 thomas.ad 
25 dd038bc6 2021-09-21 thomas.ad int
26 dd038bc6 2021-09-21 thomas.ad asprintf(char **ret, const char *fmt, ...)
27 dd038bc6 2021-09-21 thomas.ad {
28 dd038bc6 2021-09-21 thomas.ad 	va_list	ap;
29 dd038bc6 2021-09-21 thomas.ad 	int	n;
30 dd038bc6 2021-09-21 thomas.ad 
31 dd038bc6 2021-09-21 thomas.ad 	va_start(ap, fmt);
32 dd038bc6 2021-09-21 thomas.ad 	n = vasprintf(ret, fmt, ap);
33 dd038bc6 2021-09-21 thomas.ad 	va_end(ap);
34 dd038bc6 2021-09-21 thomas.ad 
35 dd038bc6 2021-09-21 thomas.ad 	return (n);
36 dd038bc6 2021-09-21 thomas.ad }
37 dd038bc6 2021-09-21 thomas.ad 
38 dd038bc6 2021-09-21 thomas.ad int
39 dd038bc6 2021-09-21 thomas.ad vasprintf(char **ret, const char *fmt, va_list ap)
40 dd038bc6 2021-09-21 thomas.ad {
41 dd038bc6 2021-09-21 thomas.ad 	int	 n;
42 dd038bc6 2021-09-21 thomas.ad 	va_list  ap2;
43 dd038bc6 2021-09-21 thomas.ad 
44 dd038bc6 2021-09-21 thomas.ad 	va_copy(ap2, ap);
45 dd038bc6 2021-09-21 thomas.ad 
46 dd038bc6 2021-09-21 thomas.ad 	if ((n = vsnprintf(NULL, 0, fmt, ap)) < 0)
47 dd038bc6 2021-09-21 thomas.ad 		goto error;
48 dd038bc6 2021-09-21 thomas.ad 
49 dd038bc6 2021-09-21 thomas.ad 	*ret = malloc(n + 1);
50 dd038bc6 2021-09-21 thomas.ad 	if (*ret == NULL)
51 dd038bc6 2021-09-21 thomas.ad 		errx(1, "vasprintf: malloc failed");
52 dd038bc6 2021-09-21 thomas.ad 	if ((n = vsnprintf(*ret, n + 1, fmt, ap2)) < 0) {
53 dd038bc6 2021-09-21 thomas.ad 		free(*ret);
54 dd038bc6 2021-09-21 thomas.ad 		goto error;
55 dd038bc6 2021-09-21 thomas.ad 	}
56 dd038bc6 2021-09-21 thomas.ad 	va_end(ap2);
57 dd038bc6 2021-09-21 thomas.ad 
58 dd038bc6 2021-09-21 thomas.ad 	return (n);
59 dd038bc6 2021-09-21 thomas.ad 
60 dd038bc6 2021-09-21 thomas.ad error:
61 dd038bc6 2021-09-21 thomas.ad 	va_end(ap2);
62 dd038bc6 2021-09-21 thomas.ad 	*ret = NULL;
63 dd038bc6 2021-09-21 thomas.ad 	return (-1);
64 dd038bc6 2021-09-21 thomas.ad }