vasprintf.c revision 92986 
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 92986 2002-03-22 21:53:29Z obrien $");
32
33#include <stdio.h>
34#include <stdlib.h>
35#include <errno.h>
36#include "local.h"
37
38int
39vasprintf(str, fmt, ap)
40	char **str;
41	const char *fmt;
42	_BSD_VA_LIST_ ap;
43{
44	int ret;
45	FILE f;
46
47	f._file = -1;
48	f._flags = __SWR | __SSTR | __SALC;
49	f._bf._base = f._p = (unsigned char *)malloc(128);
50	if (f._bf._base == NULL) {
51		*str = NULL;
52		errno = ENOMEM;
53		return (-1);
54	}
55	f._bf._size = f._w = 127;		/* Leave room for the NULL */
56	ret = __vfprintf(&f, fmt, ap);
57	*f._p = '\0';
58	f._bf._base = reallocf(f._bf._base, f._bf._size + 1);
59	if (f._bf._base == NULL) {
60		errno = ENOMEM;
61		ret = -1;
62	}
63	*str = (char *)f._bf._base;
64	return (ret);
65}
66