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1 /*-
2 * Copyright (c) 2002 Tim J. Robbins
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/lib/libc/locale/wcsftime.c,v 1.4 2004/04/07 09:47:56 tjr Exp $");
29
30 #include "xlocale_private.h"
31
32 #include <errno.h>
33 #include <limits.h>
34 #include <stdlib.h>
35 #include <time.h>
36 #include <wchar.h>
37
38 /*
39 * Convert date and time to a wide-character string.
40 *
41 * This is the wide-character counterpart of strftime(). So that we do not
42 * have to duplicate the code of strftime(), we convert the format string to
43 * multibyte, call strftime(), then convert the result back into wide
44 * characters.
45 *
46 * This technique loses in the presence of stateful multibyte encoding if any
47 * of the conversions in the format string change conversion state. When
48 * stateful encoding is implemented, we will need to reset the state between
49 * format specifications in the format string.
50 */
51 size_t
52 wcsftime_l(wchar_t * __restrict wcs, size_t maxsize,
53 const wchar_t * __restrict format, const struct tm * __restrict timeptr,
54 locale_t loc)
55 {
56 static const mbstate_t initial;
57 mbstate_t mbs;
58 char *dst, *dstp, *sformat;
59 size_t n, sflen;
60 int sverrno;
61
62 NORMALIZE_LOCALE(loc);
63 sformat = dst = NULL;
64
65 /*
66 * Convert the supplied format string to a multibyte representation
67 * for strftime(), which only handles single-byte characters.
68 */
69 mbs = initial;
70 sflen = wcsrtombs_l(NULL, &format, 0, &mbs, loc);
71 if (sflen == (size_t)-1)
72 goto error;
73 if ((sformat = malloc(sflen + 1)) == NULL)
74 goto error;
75 mbs = initial;
76 wcsrtombs_l(sformat, &format, sflen + 1, &mbs, loc);
77
78 /*
79 * Allocate memory for longest multibyte sequence that will fit
80 * into the caller's buffer and call strftime() to fill it.
81 * Then, copy and convert the result back into wide characters in
82 * the caller's buffer.
83 */
84 if (SIZE_T_MAX / MB_CUR_MAX_L(loc) <= maxsize) {
85 /* maxsize is prepostorously large - avoid int. overflow. */
86 errno = EINVAL;
87 goto error;
88 }
89 if ((dst = malloc(maxsize * MB_CUR_MAX_L(loc))) == NULL)
90 goto error;
91 if (strftime_l(dst, maxsize, sformat, timeptr, loc) == 0)
92 goto error;
93 dstp = dst;
94 mbs = initial;
95 n = mbsrtowcs_l(wcs, (const char **)&dstp, maxsize, &mbs, loc);
96 if (n == (size_t)-2 || n == (size_t)-1 || dstp != NULL)
97 goto error;
98
99 free(sformat);
100 free(dst);
101 return (n);
102
103 error:
104 sverrno = errno;
105 free(sformat);
106 free(dst);
107 errno = sverrno;
108 return (0);
109 }
110
111 size_t
112 wcsftime(wchar_t * __restrict wcs, size_t maxsize,
113 const wchar_t * __restrict format, const struct tm * __restrict timeptr)
114 {
115 return wcsftime_l(wcs, maxsize, format, timeptr, __current_locale());
116 }