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1 /* $NetBSD: wcsftime.c,v 1.2 2006/10/04 14:19:16 tnozaki Exp $ */
3 * Copyright (c) 2002 Tim J. Robbins
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <LibConfig.h>
28 #include <sys/EfiCdefs.h>
29 #if defined(LIBC_SCCS) && !defined(lint)
31 __FBSDID("$FreeBSD: src/lib/libc/locale/wcsftime.c,v 1.4 2004/04/07 09:47:56 tjr Exp $");
33 __RCSID("$NetBSD: wcsftime.c,v 1.2 2006/10/04 14:19:16 tnozaki Exp $");
35 #endif /* LIBC_SCCS and not lint */
42 #include <machine/int_limits.h>
45 * Convert date and time to a wide-character string.
47 * This is the wide-character counterpart of strftime(). So that we do not
48 * have to duplicate the code of strftime(), we convert the format string to
49 * multibyte, call strftime(), then convert the result back into wide
52 * This technique loses in the presence of stateful multibyte encoding if any
53 * of the conversions in the format string change conversion state. When
54 * stateful encoding is implemented, we will need to reset the state between
55 * format specifications in the format string.
58 wcsftime(wchar_t *wcs
, size_t maxsize
,
59 const wchar_t *format
, const struct tm
*timeptr
)
61 char *dst
, *dstp
, *sformat
;
68 * Convert the supplied format string to a multibyte representation
69 * for strftime(), which only handles single-byte characters.
71 sflen
= wcstombs(NULL
, format
, 0);
72 if (sflen
== (size_t)-1)
74 if ((sformat
= malloc(sflen
+ 1)) == NULL
)
76 wcstombs(sformat
, format
, sflen
+ 1);
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.
84 if (SIZE_T_MAX
/ MB_CUR_MAX
<= maxsize
) {
85 /* maxsize is preposturously large - avoid int. overflow. */
89 dst
= malloc(maxsize
* MB_CUR_MAX
);
92 if (strftime(dst
, maxsize
, sformat
, timeptr
) == 0)
95 n
= mbstowcs(wcs
, dstp
, maxsize
);
96 if (n
== (size_t)-2 || n
== (size_t)-1)