88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
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/*-
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* Copyright (c) 2002 Tim J. Robbins
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <limits.h>
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#include <stdlib.h>
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#include <time.h>
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#include <wchar.h>
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/*
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* Convert date and time to a wide-character string.
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*
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* This is the wide-character counterpart of strftime(). So that we do not
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* have to duplicate the code of strftime(), we convert the format string to
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* multibyte, call strftime(), then convert the result back into wide
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* characters.
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*
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* This technique loses in the presence of stateful multibyte encoding if any
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* of the conversions in the format string change conversion state. When
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* stateful encoding is implemented, we will need to reset the state between
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* format specifications in the format string.
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*/
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size_t
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wcsftime(wchar_t * __restrict wcs, size_t maxsize,
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const wchar_t * __restrict format, const struct tm * __restrict timeptr)
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{
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static const mbstate_t initial;
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mbstate_t state;
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char *dst, *sformat;
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size_t n, sflen;
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/*
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* Convert the supplied format string to a multibyte representation
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* for strftime(), which only handles single-byte characters.
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*/
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state = initial;
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sflen = wcsrtombs(NULL, &format, 0, &state);
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if (sflen == (size_t)-1)
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return (0);
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sformat = alloca(sflen + 1);
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state = initial;
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wcsrtombs(sformat, &format, sflen + 1, &state);
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/*
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* Allocate memory for longest multibyte sequence that will fit
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* into the caller's buffer and call strftime() to fill it.
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* Then, copy and convert the result back into wide characters in
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* the caller's buffer.
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*/
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if (SIZE_T_MAX / MB_CUR_MAX <= maxsize)
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/* maxsize is prepostorously large - avoid int. overflow. */
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return (0);
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dst = alloca(maxsize * MB_CUR_MAX);
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if (strftime(dst, maxsize, sformat, timeptr) == 0)
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return (0);
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state = initial;
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n = mbsrtowcs(wcs, (const char **)&dst, maxsize, &state);
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if (n == (size_t)-2 || n == (size_t)-1 || dst != NULL)
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return (0);
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return (n);
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}
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