1/*-
2 * Copyright (c) 2013-2015 Sandvine Inc.  All rights reserved.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/param.h>
28#include <sys/systm.h>
29#include <sys/malloc.h>
30
31#include <machine/stdarg.h>
32
33int
34vasprintf(char **buf, struct malloc_type *mtp, const char *format, va_list va)
35{
36	int len, ret;
37	va_list tmp_va;
38	char dummy;
39
40	va_copy(tmp_va, va);
41	len = vsnprintf(&dummy, 0, format, tmp_va);
42	va_end(tmp_va);
43	if (len < 0) {
44		*buf = NULL;
45		return (len);
46	}
47
48	/* Account for null terminator. */
49	len += 1;
50	*buf = malloc(len, mtp, M_NOWAIT);
51	if (*buf == NULL)
52		return (-1);
53
54	ret = vsnprintf(*buf, len, format, va);
55	if (ret < 0) {
56		free(*buf, mtp);
57		*buf = NULL;
58	}
59
60	return (ret);
61}
62
63int
64asprintf(char **buf, struct malloc_type *mtp, const char *format, ...)
65{
66	int ret;
67	va_list va;
68
69	va_start(va, format);
70	ret = vasprintf(buf, mtp, format, va);
71	va_end(va);
72
73	return (ret);
74}
75