vasprintf.c revision 206217 
1/*	$OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $	*/
2
3/*
4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/lib/libc/stdio/vasprintf.c 206217 2010-04-05 22:09:29Z obrien $");
32
33#include <stdio.h>
34#include <stdlib.h>
35#include <errno.h>
36#include "local.h"
37
38int
39vasprintf(char **str, const char *fmt, __va_list ap)
40{
41	FILE f = FAKE_FILE;
42	int ret;
43
44	f._flags = __SWR | __SSTR | __SALC;
45	f._bf._base = f._p = malloc(128);
46	if (f._bf._base == NULL) {
47		*str = NULL;
48		errno = ENOMEM;
49		return (-1);
50	}
51	f._bf._size = f._w = 127;		/* Leave room for the NUL */
52	ret = __vfprintf(&f, fmt, ap);
53	if (ret < 0) {
54		free(f._bf._base);
55		*str = NULL;
56		errno = ENOMEM;
57		return (-1);
58	}
59	*f._p = '\0';
60	*str = (char *)f._bf._base;
61	return (ret);
62}
63