xref: /freebsd/lib/libc/stdio/vasprintf.c (revision 7c43148a974877188a930e4078a164f83da8e652)
1 /*	$OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $	*/
2 
3 /*-
4  * SPDX-License-Identifier: BSD-3-Clause
5  *
6  * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
7  * All rights reserved.
8  *
9  * Copyright (c) 2011 The FreeBSD Foundation
10  *
11  * Portions of this software were developed by David Chisnall
12  * under sponsorship from the FreeBSD Foundation.
13  *
14  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions
16  * are met:
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  * 2. Redistributions in binary form must reproduce the above copyright
20  *    notice, this list of conditions and the following disclaimer in the
21  *    documentation and/or other materials provided with the distribution.
22  * 3. The name of the author may not be used to endorse or promote products
23  *    derived from this software without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
26  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
27  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
28  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
31  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
32  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
33  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
34  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35  */
36 
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <errno.h>
40 #include "xlocale_private.h"
41 #include "local.h"
42 
43 int
44 vasprintf_l(char **str, locale_t locale, const char *fmt, __va_list ap)
45 {
46 	FILE f = FAKE_FILE;
47 	int ret;
48 	FIX_LOCALE(locale);
49 
50 	f._flags = __SWR | __SSTR | __SALC;
51 	f._bf._base = f._p = malloc(128);
52 	if (f._bf._base == NULL) {
53 		*str = NULL;
54 		errno = ENOMEM;
55 		return (-1);
56 	}
57 	f._bf._size = f._w = 127;		/* Leave room for the NUL */
58 	ret = __vfprintf(&f, locale, fmt, ap);
59 	if (ret < 0) {
60 		free(f._bf._base);
61 		*str = NULL;
62 		errno = ENOMEM;
63 		return (-1);
64 	}
65 	*f._p = '\0';
66 	*str = (char *)f._bf._base;
67 	return (ret);
68 }
69 int
70 vasprintf(char **str, const char *fmt, __va_list ap)
71 {
72 	return vasprintf_l(str, __get_locale(), fmt, ap);
73 }
74