timelocal.c revision 53940
1/*- 2 * Copyright (c) 1997 FreeBSD Inc. 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 * $FreeBSD: head/lib/libc/stdtime/timelocal.c 53940 1999-11-30 07:33:37Z ache $ 27 */ 28 29#include <sys/types.h> 30#include <sys/stat.h> 31#include <sys/syslimits.h> 32#include <fcntl.h> 33#include <locale.h> 34#include <stddef.h> 35#include <stdlib.h> 36#include <string.h> 37#include "setlocale.h" 38#include "timelocal.h" 39 40static int split_lines(char *, const char *); 41static void set_from_buf(const char *, int); 42 43struct lc_time_T _time_localebuf; 44int _time_using_locale; 45 46#define LCTIME_SIZE_FULL (sizeof(struct lc_time_T) / sizeof(char *)) 47#define LCTIME_SIZE_1 \ 48 (offsetof(struct lc_time_T, alt_month[0]) / sizeof(char *)) 49#define LCTIME_SIZE_2 \ 50 (offsetof(struct lc_time_T, Ex_fmt) / sizeof(char *)) 51 52const struct lc_time_T _C_time_locale = { 53 { 54 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 55 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 56 }, { 57 "January", "February", "March", "April", "May", "June", 58 "July", "August", "September", "October", "November", "December" 59 }, { 60 "Sun", "Mon", "Tue", "Wed", 61 "Thu", "Fri", "Sat" 62 }, { 63 "Sunday", "Monday", "Tuesday", "Wednesday", 64 "Thursday", "Friday", "Saturday" 65 }, 66 67 /* X_fmt */ 68 "%H:%M:%S", 69 70 /* 71 ** x_fmt 72 ** Since the C language standard calls for 73 ** "date, using locale's date format," anything goes. 74 ** Using just numbers (as here) makes Quakers happier; 75 ** it's also compatible with SVR4. 76 */ 77 "%m/%d/%y", 78 79 /* 80 ** c_fmt (ctime-compatible) 81 ** Note that 82 ** "%a %b %d %H:%M:%S %Y" 83 ** is used by Solaris 2.3. 84 */ 85 "%a %Ex %X %Y", 86 87 /* am */ 88 "AM", 89 90 /* pm */ 91 "PM", 92 93 /* date_fmt */ 94 "%a %Ex %X %Z %Y", 95 96 { 97 "January", "February", "March", "April", "May", "June", 98 "July", "August", "September", "October", "November", "December" 99 }, 100 101 /* Ex_fmt 102 ** To determine months / day order 103 */ 104 "%b %e" 105}; 106 107 108int 109__time_load_locale(const char *name) 110{ 111 static char * locale_buf; 112 static char locale_buf_C[] = "C"; 113 static int num_lines; 114 115 int fd; 116 char * lbuf; 117 char * p; 118 const char * plim; 119 char filename[PATH_MAX]; 120 struct stat st; 121 size_t namesize; 122 size_t bufsize; 123 int save_using_locale; 124 125 save_using_locale = _time_using_locale; 126 _time_using_locale = 0; 127 128 if (name == NULL) 129 goto no_locale; 130 131 if (!strcmp(name, "C") || !strcmp(name, "POSIX")) 132 return 0; 133 134 /* 135 ** If the locale name is the same as our cache, use the cache. 136 */ 137 lbuf = locale_buf; 138 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 139 set_from_buf(lbuf, num_lines); 140 _time_using_locale = 1; 141 return 0; 142 } 143 /* 144 ** Slurp the locale file into the cache. 145 */ 146 namesize = strlen(name) + 1; 147 148 if (!_PathLocale) 149 goto no_locale; 150 /* Range checking not needed, 'name' size is limited */ 151 strcpy(filename, _PathLocale); 152 strcat(filename, "/"); 153 strcat(filename, name); 154 strcat(filename, "/LC_TIME"); 155 fd = open(filename, O_RDONLY); 156 if (fd < 0) 157 goto no_locale; 158 if (fstat(fd, &st) != 0) 159 goto bad_locale; 160 if (st.st_size <= 0) 161 goto bad_locale; 162 bufsize = namesize + st.st_size; 163 locale_buf = NULL; 164 lbuf = (lbuf == NULL || lbuf == locale_buf_C) ? 165 malloc(bufsize) : reallocf(lbuf, bufsize); 166 if (lbuf == NULL) 167 goto bad_locale; 168 (void) strcpy(lbuf, name); 169 p = lbuf + namesize; 170 plim = p + st.st_size; 171 if (read(fd, p, (size_t) st.st_size) != st.st_size) 172 goto bad_lbuf; 173 if (close(fd) != 0) 174 goto bad_lbuf; 175 /* 176 ** Parse the locale file into localebuf. 177 */ 178 if (plim[-1] != '\n') 179 goto bad_lbuf; 180 num_lines = split_lines(p, plim); 181 if (num_lines >= LCTIME_SIZE_FULL) 182 num_lines = LCTIME_SIZE_FULL; 183 else if (num_lines >= LCTIME_SIZE_2) 184 num_lines = LCTIME_SIZE_2; 185 else if (num_lines >= LCTIME_SIZE_1) 186 num_lines = LCTIME_SIZE_1; 187 else 188 goto reset_locale; 189 set_from_buf(lbuf, num_lines); 190 /* 191 ** Record the successful parse in the cache. 192 */ 193 locale_buf = lbuf; 194 195 _time_using_locale = 1; 196 return 0; 197 198reset_locale: 199 /* 200 * XXX - This may not be the correct thing to do in this case. 201 * setlocale() assumes that we left the old locale alone. 202 */ 203 locale_buf = locale_buf_C; 204 _time_localebuf = _C_time_locale; 205 save_using_locale = 0; 206bad_lbuf: 207 free(lbuf); 208bad_locale: 209 (void) close(fd); 210no_locale: 211 _time_using_locale = save_using_locale; 212 return -1; 213} 214 215static int 216split_lines(char *p, const char *plim) 217{ 218 int i; 219 220 for (i = 0; p < plim; i++) { 221 p = strchr(p, '\n'); 222 *p++ = '\0'; 223 } 224 return i; 225} 226 227static void 228set_from_buf(const char *p, int num_lines) 229{ 230 const char **ap; 231 int i; 232 233 for (ap = (const char **) &_time_localebuf, i = 0; 234 i < num_lines; ++ap, ++i) 235 *ap = p += strlen(p) + 1; 236 if (num_lines == LCTIME_SIZE_FULL) 237 return; 238 for (i = 0; i < 12; i++) 239 _time_localebuf.alt_month[i] = _time_localebuf.month[i]; 240} 241