1 /* $NetBSD: vasprintf.c,v 1.17 2013/05/19 21:45:00 christos 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 #if defined(LIBC_SCCS) && !defined(lint)
32 __RCSID("$NetBSD: vasprintf.c,v 1.17 2013/05/19 21:45:00 christos Exp $");
33 #endif /* LIBC_SCCS and not lint */
34
35 #include "namespace.h"
36
37 #include <assert.h>
38 #include <errno.h>
39 #include <locale.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42
43 #include "reentrant.h"
44 #include "setlocale_local.h"
45 #include "local.h"
46
__weak_alias(asprintf,_asprintf)47 __weak_alias(asprintf, _asprintf)
48 __weak_alias(asprintf_l, _asprintf_l)
49 __weak_alias(vasprintf, _vasprintf)
50 __weak_alias(vasprintf_l, _vasprintf_l)
51
52 int
53 vasprintf_l(char **str, locale_t loc, const char *fmt, va_list ap)
54 {
55 int ret;
56 FILE f;
57 struct __sfileext fext;
58 unsigned char *_base;
59
60 _DIAGASSERT(str != NULL);
61 _DIAGASSERT(fmt != NULL);
62
63 _FILEEXT_SETUP(&f, &fext);
64 f._file = -1;
65 f._flags = __SWR | __SSTR | __SALC;
66 f._bf._base = f._p = malloc(128);
67 if (f._bf._base == NULL)
68 goto err;
69 f._bf._size = f._w = 127; /* Leave room for the NUL */
70 ret = __vfprintf_unlocked_l(&f, loc, fmt, ap);
71 if (ret == -1)
72 goto err;
73 *f._p = '\0';
74 _base = realloc(f._bf._base, (size_t)(ret + 1));
75 if (_base == NULL)
76 goto err;
77 *str = (char *)_base;
78 return ret;
79
80 err:
81 if (f._bf._base)
82 free(f._bf._base);
83 *str = NULL;
84 errno = ENOMEM;
85 return -1;
86 }
87
88 int
vasprintf(char ** str,const char * fmt,va_list ap)89 vasprintf(char **str, const char *fmt, va_list ap)
90 {
91 return vasprintf_l(str, _current_locale(), fmt, ap);
92 }
93
94 int
asprintf_l(char ** str,locale_t loc,char const * fmt,...)95 asprintf_l(char **str, locale_t loc, char const *fmt, ...)
96 {
97 va_list ap;
98 int ret;
99
100 va_start(ap, fmt);
101 ret = vasprintf_l(str, loc, fmt, ap);
102 va_end(ap);
103 return ret;
104 }
105
106 int
asprintf(char ** str,char const * fmt,...)107 asprintf(char **str, char const *fmt, ...)
108 {
109 va_list ap;
110 int ret;
111
112 va_start(ap, fmt);
113 ret = vasprintf(str, fmt, ap);
114 va_end(ap);
115 return ret;
116 }
117