1 /*- 2 * Copyright (c) 2002 Tim J. Robbins 3 * All rights reserved. 4 * 5 * Copyright (c) 2011 The FreeBSD Foundation 6 * All rights reserved. 7 * Portions of this software were developed by David Chisnall 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <errno.h> 36 #include <limits.h> 37 #include <stdlib.h> 38 #include <time.h> 39 #include <wchar.h> 40 #include "xlocale_private.h" 41 42 /* 43 * Convert date and time to a wide-character string. 44 * 45 * This is the wide-character counterpart of strftime(). So that we do not 46 * have to duplicate the code of strftime(), we convert the format string to 47 * multibyte, call strftime(), then convert the result back into wide 48 * characters. 49 * 50 * This technique loses in the presence of stateful multibyte encoding if any 51 * of the conversions in the format string change conversion state. When 52 * stateful encoding is implemented, we will need to reset the state between 53 * format specifications in the format string. 54 */ 55 size_t 56 wcsftime_l(wchar_t * __restrict wcs, size_t maxsize, 57 const wchar_t * __restrict format, const struct tm * __restrict timeptr, 58 locale_t locale) 59 { 60 static const mbstate_t initial; 61 mbstate_t mbs; 62 char *dst, *sformat; 63 const char *dstp; 64 const wchar_t *formatp; 65 size_t n, sflen; 66 int sverrno; 67 FIX_LOCALE(locale); 68 69 sformat = dst = NULL; 70 71 /* 72 * Convert the supplied format string to a multibyte representation 73 * for strftime(), which only handles single-byte characters. 74 */ 75 mbs = initial; 76 formatp = format; 77 sflen = wcsrtombs_l(NULL, &formatp, 0, &mbs, locale); 78 if (sflen == (size_t)-1) 79 goto error; 80 if ((sformat = malloc(sflen + 1)) == NULL) 81 goto error; 82 mbs = initial; 83 wcsrtombs_l(sformat, &formatp, sflen + 1, &mbs, locale); 84 85 /* 86 * Allocate memory for longest multibyte sequence that will fit 87 * into the caller's buffer and call strftime() to fill it. 88 * Then, copy and convert the result back into wide characters in 89 * the caller's buffer. 90 */ 91 if (SIZE_T_MAX / MB_CUR_MAX <= maxsize) { 92 /* maxsize is prepostorously large - avoid int. overflow. */ 93 errno = EINVAL; 94 goto error; 95 } 96 if ((dst = malloc(maxsize * MB_CUR_MAX)) == NULL) 97 goto error; 98 if (strftime_l(dst, maxsize, sformat, timeptr, locale) == 0) 99 goto error; 100 dstp = dst; 101 mbs = initial; 102 n = mbsrtowcs_l(wcs, &dstp, maxsize, &mbs, locale); 103 if (n == (size_t)-2 || n == (size_t)-1 || dstp != NULL) 104 goto error; 105 106 free(sformat); 107 free(dst); 108 return (n); 109 110 error: 111 sverrno = errno; 112 free(sformat); 113 free(dst); 114 errno = sverrno; 115 return (0); 116 } 117 size_t 118 wcsftime(wchar_t * __restrict wcs, size_t maxsize, 119 const wchar_t * __restrict format, const struct tm * __restrict timeptr) 120 { 121 return wcsftime_l(wcs, maxsize, format, timeptr, __get_locale()); 122 } 123