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 <[email protected]>
7 * All rights reserved.
8 *
9 * Copyright (c) 2011 The FreeBSD Foundation
10 * All rights reserved.
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 __FBSDID("$FreeBSD$");
42
43 #include <errno.h>
44 #include <limits.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <wchar.h>
48 #include "local.h"
49 #include "xlocale_private.h"
50
51 int
vswprintf_l(wchar_t * __restrict s,size_t n,locale_t locale,const wchar_t * __restrict fmt,__va_list ap)52 vswprintf_l(wchar_t * __restrict s, size_t n, locale_t locale,
53 const wchar_t * __restrict fmt, __va_list ap)
54 {
55 static const mbstate_t initial;
56 mbstate_t mbs;
57 FILE f = FAKE_FILE;
58 char *mbp;
59 int ret, sverrno;
60 size_t nwc;
61 FIX_LOCALE(locale);
62
63 if (n == 0) {
64 errno = EINVAL;
65 return (-1);
66 }
67 if (n - 1 > INT_MAX) {
68 errno = EOVERFLOW;
69 *s = L'\0';
70 return (-1);
71 }
72
73 f._flags = __SWR | __SSTR | __SALC;
74 f._bf._base = f._p = (unsigned char *)malloc(128);
75 if (f._bf._base == NULL) {
76 errno = ENOMEM;
77 *s = L'\0';
78 return (-1);
79 }
80 f._bf._size = f._w = 127; /* Leave room for the NUL */
81 ret = __vfwprintf(&f, locale, fmt, ap);
82 if (ret < 0) {
83 sverrno = errno;
84 free(f._bf._base);
85 errno = sverrno;
86 *s = L'\0';
87 return (-1);
88 }
89 *f._p = '\0';
90 mbp = f._bf._base;
91 /*
92 * XXX Undo the conversion from wide characters to multibyte that
93 * fputwc() did in __vfwprintf().
94 */
95 mbs = initial;
96 nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, locale);
97 free(f._bf._base);
98 if (nwc == (size_t)-1) {
99 errno = EILSEQ;
100 *s = L'\0';
101 return (-1);
102 }
103 if (nwc == n) {
104 s[n - 1] = L'\0';
105 errno = EOVERFLOW;
106 return (-1);
107 }
108
109 return (ret);
110 }
111 int
vswprintf(wchar_t * __restrict s,size_t n,const wchar_t * __restrict fmt,__va_list ap)112 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
113 __va_list ap)
114 {
115 return vswprintf_l(s, n, __get_locale(), fmt, ap);
116 }
117