b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/* $NetBSD: wcsftime.c,v 1.3 2007/05/21 15:32:17 tnozaki Exp $ */
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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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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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__FBSDID("$FreeBSD: src/lib/libc/locale/wcsftime.c,v 1.4 2004/04/07 09:47:56 tjr Exp $");
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#else
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__RCSID("$NetBSD: wcsftime.c,v 1.3 2007/05/21 15:32:17 tnozaki Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <errno.h>
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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 *wcs, size_t maxsize,
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const wchar_t *format, const struct tm *timeptr)
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{
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char *dst, *dstp, *sformat;
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size_t n, sflen;
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int sverrno;
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sformat = dst = NULL;
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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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sflen = wcstombs(NULL, format, 0);
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if (sflen == (size_t)-1)
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goto error;
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if ((sformat = malloc(sflen + 1)) == NULL)
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goto error;
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wcstombs(sformat, format, sflen + 1);
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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 preposterously large - avoid int. overflow. */
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errno = EINVAL;
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goto error;
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}
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dst = malloc(maxsize * MB_CUR_MAX);
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if (dst == NULL)
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goto error;
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if (strftime(dst, maxsize, sformat, timeptr) == 0)
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goto error;
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dstp = dst;
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n = mbstowcs(wcs, dstp, maxsize);
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if (n == (size_t)-2 || n == (size_t)-1)
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goto error;
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free(sformat);
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free(dst);
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return n;
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error:
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sverrno = errno;
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free(sformat);
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free(dst);
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errno = sverrno;
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return 0;
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}
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