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 <sys/cdefs.h>
38 #if 0
39 __FBSDID("FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.16 2002/08/21 16:19:57 mike Exp ");
40 #endif
41 #include <errno.h>
42 #include <limits.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <wchar.h>
46 #include "local.h"
47 #include "xlocale_private.h"
48
49 int
vswprintf_l(wchar_t * __restrict s,size_t n,locale_t locale,const wchar_t * __restrict fmt,__va_list ap)50 vswprintf_l(wchar_t * __restrict s, size_t n, locale_t locale,
51 const wchar_t * __restrict fmt, __va_list ap)
52 {
53 static const mbstate_t initial;
54 mbstate_t mbs;
55 FILE f = FAKE_FILE;
56 char *mbp;
57 int ret, sverrno;
58 size_t nwc;
59 FIX_LOCALE(locale);
60
61 if (n == 0) {
62 errno = EINVAL;
63 return (-1);
64 }
65 if (n - 1 > INT_MAX) {
66 errno = EOVERFLOW;
67 *s = L'\0';
68 return (-1);
69 }
70
71 f._flags = __SWR | __SSTR | __SALC;
72 f._bf._base = f._p = (unsigned char *)malloc(128);
73 if (f._bf._base == NULL) {
74 errno = ENOMEM;
75 *s = L'\0';
76 return (-1);
77 }
78 f._bf._size = f._w = 127; /* Leave room for the NUL */
79 ret = __vfwprintf(&f, locale, fmt, ap);
80 if (ret < 0) {
81 sverrno = errno;
82 free(f._bf._base);
83 errno = sverrno;
84 *s = L'\0';
85 return (-1);
86 }
87 *f._p = '\0';
88 mbp = f._bf._base;
89 /*
90 * XXX Undo the conversion from wide characters to multibyte that
91 * fputwc() did in __vfwprintf().
92 */
93 mbs = initial;
94 nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, locale);
95 free(f._bf._base);
96 if (nwc == (size_t)-1) {
97 errno = EILSEQ;
98 *s = L'\0';
99 return (-1);
100 }
101 if (nwc == n) {
102 s[n - 1] = L'\0';
103 errno = EOVERFLOW;
104 return (-1);
105 }
106
107 return (ret);
108 }
109 int
vswprintf(wchar_t * __restrict s,size_t n,const wchar_t * __restrict fmt,__va_list ap)110 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
111 __va_list ap)
112 {
113 return vswprintf_l(s, n, __get_locale(), fmt, ap);
114 }
115