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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 #if defined(LIBC_RCS) && !defined(lint)
31 static char rcsid[] = "$FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.12 2001/01/24 13:00:47 deischen Exp $";
32 #endif /* LIBC_RCS and not lint */
33
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <errno.h>
37
38 int
39 vasprintf(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 ;
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 = realloc(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 }