timelocal.c revision 71579
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 71579 2001-01-24 13:01:12Z deischen $ 27 */ 28 29#include "namespace.h" 30#include <sys/types.h> 31#include <sys/stat.h> 32#include <sys/syslimits.h> 33#include <fcntl.h> 34#include <locale.h> 35#include <stddef.h> 36#include <stdlib.h> 37#include <string.h> 38#include <unistd.h> 39#include "un-namespace.h" 40 41#include "setlocale.h" 42#include "timelocal.h" 43 44static int split_lines(char *, const char *); 45static void set_from_buf(const char *, int); 46 47struct lc_time_T _time_localebuf; 48int _time_using_locale; 49 50#define LCTIME_SIZE_FULL (sizeof(struct lc_time_T) / sizeof(char *)) 51#define LCTIME_SIZE_1 \ 52 (offsetof(struct lc_time_T, alt_month[0]) / sizeof(char *)) 53#define LCTIME_SIZE_2 \ 54 (offsetof(struct lc_time_T, Ef_fmt) / sizeof(char *)) 55 56const struct lc_time_T _C_time_locale = { 57 { 58 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 59 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 60 }, { 61 "January", "February", "March", "April", "May", "June", 62 "July", "August", "September", "October", "November", "December" 63 }, { 64 "Sun", "Mon", "Tue", "Wed", 65 "Thu", "Fri", "Sat" 66 }, { 67 "Sunday", "Monday", "Tuesday", "Wednesday", 68 "Thursday", "Friday", "Saturday" 69 }, 70 71 /* X_fmt */ 72 "%H:%M:%S", 73 74 /* 75 ** x_fmt 76 ** Since the C language standard calls for 77 ** "date, using locale's date format," anything goes. 78 ** Using just numbers (as here) makes Quakers happier; 79 ** it's also compatible with SVR4. 80 */ 81 "%m/%d/%y", 82 83 /* 84 ** c_fmt (ctime-compatible) 85 ** Not used, just compatibility placeholder. 86 */ 87 NULL, 88 89 /* am */ 90 "AM", 91 92 /* pm */ 93 "PM", 94 95 /* date_fmt */ 96 "%a %Ef %X %Z %Y", 97 98 { 99 "January", "February", "March", "April", "May", "June", 100 "July", "August", "September", "October", "November", "December" 101 }, 102 103 /* Ef_fmt 104 ** To determine short months / day order 105 */ 106 "%b %e", 107 108 /* EF_fmt 109 ** To determine long months / day order 110 */ 111 "%B %e" 112}; 113 114 115int 116__time_load_locale(const char *name) 117{ 118 static char * locale_buf; 119 static char locale_buf_C[] = "C"; 120 static int num_lines; 121 122 int fd; 123 char * lbuf; 124 char * p; 125 const char * plim; 126 char filename[PATH_MAX]; 127 struct stat st; 128 size_t namesize; 129 size_t bufsize; 130 int save_using_locale; 131 132 save_using_locale = _time_using_locale; 133 _time_using_locale = 0; 134 135 if (name == NULL) 136 goto no_locale; 137 138 if (!strcmp(name, "C") || !strcmp(name, "POSIX")) 139 return 0; 140 141 /* 142 ** If the locale name is the same as our cache, use the cache. 143 */ 144 lbuf = locale_buf; 145 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 146 set_from_buf(lbuf, num_lines); 147 _time_using_locale = 1; 148 return 0; 149 } 150 /* 151 ** Slurp the locale file into the cache. 152 */ 153 namesize = strlen(name) + 1; 154 155 if (!_PathLocale) 156 goto no_locale; 157 /* Range checking not needed, 'name' size is limited */ 158 strcpy(filename, _PathLocale); 159 strcat(filename, "/"); 160 strcat(filename, name); 161 strcat(filename, "/LC_TIME"); 162 fd = _open(filename, O_RDONLY); 163 if (fd < 0) 164 goto no_locale; 165 if (_fstat(fd, &st) != 0) 166 goto bad_locale; 167 if (st.st_size <= 0) 168 goto bad_locale; 169 bufsize = namesize + st.st_size; 170 locale_buf = NULL; 171 lbuf = (lbuf == NULL || lbuf == locale_buf_C) ? 172 malloc(bufsize) : reallocf(lbuf, bufsize); 173 if (lbuf == NULL) 174 goto bad_locale; 175 (void) strcpy(lbuf, name); 176 p = lbuf + namesize; 177 plim = p + st.st_size; 178 if (_read(fd, p, (size_t) st.st_size) != st.st_size) 179 goto bad_lbuf; 180 if (_close(fd) != 0) 181 goto bad_lbuf; 182 /* 183 ** Parse the locale file into localebuf. 184 */ 185 if (plim[-1] != '\n') 186 goto bad_lbuf; 187 num_lines = split_lines(p, plim); 188 if (num_lines >= LCTIME_SIZE_FULL) 189 num_lines = LCTIME_SIZE_FULL; 190 else if (num_lines >= LCTIME_SIZE_2) 191 num_lines = LCTIME_SIZE_2; 192 else if (num_lines >= LCTIME_SIZE_1) 193 num_lines = LCTIME_SIZE_1; 194 else 195 goto reset_locale; 196 set_from_buf(lbuf, num_lines); 197 /* 198 ** Record the successful parse in the cache. 199 */ 200 locale_buf = lbuf; 201 202 _time_using_locale = 1; 203 return 0; 204 205reset_locale: 206 /* 207 * XXX - This may not be the correct thing to do in this case. 208 * setlocale() assumes that we left the old locale alone. 209 */ 210 locale_buf = locale_buf_C; 211 _time_localebuf = _C_time_locale; 212 save_using_locale = 0; 213bad_lbuf: 214 free(lbuf); 215bad_locale: 216 (void)_close(fd); 217no_locale: 218 _time_using_locale = save_using_locale; 219 return -1; 220} 221 222static int 223split_lines(char *p, const char *plim) 224{ 225 int i; 226 227 for (i = 0; p < plim; i++) { 228 p = strchr(p, '\n'); 229 *p++ = '\0'; 230 } 231 return i; 232} 233 234static void 235set_from_buf(const char *p, int num_lines) 236{ 237 const char **ap; 238 int i; 239 240 for (ap = (const char **) &_time_localebuf, i = 0; 241 i < num_lines; ++ap, ++i) 242 *ap = p += strlen(p) + 1; 243 if (num_lines >= LCTIME_SIZE_2) 244 return; 245 for (i = 0; i < 12; i++) 246 _time_localebuf.alt_month[i] = _time_localebuf.month[i]; 247} 248