1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002 Tim J. Robbins 5 * All rights reserved. 6 * 7 * Copyright (c) 2011 The FreeBSD Foundation 8 * 9 * Portions of this software were developed by David Chisnall 10 * under sponsorship from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <errno.h> 38 #include <limits.h> 39 #include <stdlib.h> 40 #include <time.h> 41 #include <wchar.h> 42 #include "xlocale_private.h" 43 44 /* 45 * Convert date and time to a wide-character string. 46 * 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 50 * characters. 51 * 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. 56 */ 57 size_t 58 wcsftime_l(wchar_t * __restrict wcs, size_t maxsize, 59 const wchar_t * __restrict format, const struct tm * __restrict timeptr, 60 locale_t locale) 61 { 62 static const mbstate_t initial; 63 mbstate_t mbs; 64 char *dst, *sformat; 65 const char *dstp; 66 const wchar_t *formatp; 67 size_t n, sflen; 68 int sverrno; 69 FIX_LOCALE(locale); 70 71 sformat = dst = NULL; 72 73 /* 74 * Convert the supplied format string to a multibyte representation 75 * for strftime(), which only handles single-byte characters. 76 */ 77 mbs = initial; 78 formatp = format; 79 sflen = wcsrtombs_l(NULL, &formatp, 0, &mbs, locale); 80 if (sflen == (size_t)-1) 81 goto error; 82 if ((sformat = malloc(sflen + 1)) == NULL) 83 goto error; 84 mbs = initial; 85 wcsrtombs_l(sformat, &formatp, sflen + 1, &mbs, locale); 86 87 /* 88 * Allocate memory for longest multibyte sequence that will fit 89 * into the caller's buffer and call strftime() to fill it. 90 * Then, copy and convert the result back into wide characters in 91 * the caller's buffer. 92 */ 93 if (SIZE_T_MAX / MB_CUR_MAX <= maxsize) { 94 /* maxsize is prepostorously large - avoid int. overflow. */ 95 errno = EINVAL; 96 goto error; 97 } 98 if ((dst = malloc(maxsize * MB_CUR_MAX)) == NULL) 99 goto error; 100 if (strftime_l(dst, maxsize, sformat, timeptr, locale) == 0) 101 goto error; 102 dstp = dst; 103 mbs = initial; 104 n = mbsrtowcs_l(wcs, &dstp, maxsize, &mbs, locale); 105 if (n == (size_t)-2 || n == (size_t)-1 || dstp != NULL) 106 goto error; 107 108 free(sformat); 109 free(dst); 110 return (n); 111 112 error: 113 sverrno = errno; 114 free(sformat); 115 free(dst); 116 errno = sverrno; 117 return (0); 118 } 119 size_t 120 wcsftime(wchar_t * __restrict wcs, size_t maxsize, 121 const wchar_t * __restrict format, const struct tm * __restrict timeptr) 122 { 123 return wcsftime_l(wcs, maxsize, format, timeptr, __get_locale()); 124 } 125