vasprintf.c revision 104001 
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 104001 2002-09-26 13:11:24Z tjr $");
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	__va_list ap;
43{
44	int ret;
45	FILE f;
46	struct __sFILEX ext;
47
48	f._file = -1;
49	f._flags = __SWR | __SSTR | __SALC;
50	f._bf._base = f._p = (unsigned char *)malloc(128);
51	if (f._bf._base == NULL) {
52		*str = NULL;
53		errno = ENOMEM;
54		return (-1);
55	}
56	f._bf._size = f._w = 127;		/* Leave room for the NUL */
57	f._extra = &ext;
58	INITEXTRA(&f);
59	ret = __vfprintf(&f, fmt, ap);
60	if (ret < 0) {
61		free(f._bf._base);
62		*str = NULL;
63		errno = ENOMEM;
64		return (-1);
65	}
66	*f._p = '\0';
67	*str = (char *)f._bf._base;
68	return (ret);
69}
70