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 1.6 2009/01/15 20:45:59 rdivacky 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 */ 51size_t 52wcsftime_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, *sformat; 59 const char *dstp; 60 const wchar_t *formatp; 61 size_t n, sflen; 62 int sverrno; 63 64 NORMALIZE_LOCALE(loc); 65 sformat = dst = NULL; 66 67 /* 68 * Convert the supplied format string to a multibyte representation 69 * for strftime(), which only handles single-byte characters. 70 */ 71 mbs = initial; 72 formatp = format; 73 sflen = wcsrtombs_l(NULL, &formatp, 0, &mbs, loc); 74 if (sflen == (size_t)-1) 75 goto error; 76 if ((sformat = malloc(sflen + 1)) == NULL) 77 goto error; 78 mbs = initial; 79 wcsrtombs_l(sformat, &formatp, sflen + 1, &mbs, loc); 80 81 /* 82 * Allocate memory for longest multibyte sequence that will fit 83 * into the caller's buffer and call strftime() to fill it. 84 * Then, copy and convert the result back into wide characters in 85 * the caller's buffer. 86 */ 87 if (SIZE_T_MAX / MB_CUR_MAX_L(loc) <= maxsize) { 88 /* maxsize is prepostorously large - avoid int. overflow. */ 89 errno = EINVAL; 90 goto error; 91 } 92 if ((dst = malloc(maxsize * MB_CUR_MAX_L(loc))) == NULL) 93 goto error; 94 if (strftime_l(dst, maxsize, sformat, timeptr, loc) == 0) 95 goto error; 96 dstp = dst; 97 mbs = initial; 98 n = mbsrtowcs_l(wcs, &dstp, maxsize, &mbs, loc); 99 if (n == (size_t)-2 || n == (size_t)-1 || dstp != NULL) 100 goto error; 101 102 free(sformat); 103 free(dst); 104 return (n); 105 106error: 107 sverrno = errno; 108 free(sformat); 109 free(dst); 110 errno = sverrno; 111 return (0); 112} 113 114size_t 115wcsftime(wchar_t * __restrict wcs, size_t maxsize, 116 const wchar_t * __restrict format, const struct tm * __restrict timeptr) 117{ 118 return wcsftime_l(wcs, maxsize, format, timeptr, __current_locale()); 119} 120