1 /* $NetBSD: src/lib/libc/time/strptime.c,v 1.22 2000/12/20 20:56:34 christos Exp $ */ 2 /* $DragonFly: src/lib/libc/stdtime/strptime.c,v 1.5 2005/12/04 23:25:40 swildner Exp $ */ 3 4 /*- 5 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code was contributed to The NetBSD Foundation by Klaus Klein. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/localedef.h> 40 #include <ctype.h> 41 #include <locale.h> 42 #include <string.h> 43 #include <time.h> 44 #include "private.h" 45 #include "tzfile.h" 46 47 #define _ctloc(x) (_CurrentTimeLocale->x) 48 49 /* 50 * We do not implement alternate representations. However, we always 51 * check whether a given modifier is allowed for a certain conversion. 52 */ 53 #define ALT_E 0x01 54 #define ALT_O 0x02 55 #define LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); } 56 57 static int conv_num(const unsigned char **, int *, int, int); 58 59 char * 60 strptime(const char *buf, const char *fmt, struct tm *tm) 61 { 62 unsigned char c; 63 const unsigned char *bp; 64 size_t len = 0; 65 int alt_format, i, split_year = 0; 66 67 bp = (const u_char *)buf; 68 69 while ((c = *fmt) != '\0') { 70 /* Clear `alternate' modifier prior to new conversion. */ 71 alt_format = 0; 72 73 /* Eat up white-space. */ 74 if (isspace(c)) { 75 while (isspace(*bp)) 76 bp++; 77 78 fmt++; 79 continue; 80 } 81 82 if ((c = *fmt++) != '%') 83 goto literal; 84 85 86 again: switch (c = *fmt++) { 87 case '%': /* "%%" is converted to "%". */ 88 literal: 89 if (c != *bp++) 90 return (0); 91 break; 92 93 /* 94 * "Alternative" modifiers. Just set the appropriate flag 95 * and start over again. 96 */ 97 case 'E': /* "%E?" alternative conversion modifier. */ 98 LEGAL_ALT(0); 99 alt_format |= ALT_E; 100 goto again; 101 102 case 'O': /* "%O?" alternative conversion modifier. */ 103 LEGAL_ALT(0); 104 alt_format |= ALT_O; 105 goto again; 106 107 /* 108 * "Complex" conversion rules, implemented through recursion. 109 */ 110 case 'c': /* Date and time, using the locale's format. */ 111 LEGAL_ALT(ALT_E); 112 if (!(bp = (const u_char *)strptime((const char *)bp, 113 _ctloc(d_t_fmt), tm))) 114 return (0); 115 break; 116 117 case 'D': /* The date as "%m/%d/%y". */ 118 LEGAL_ALT(0); 119 if (!(bp = (const u_char *) strptime((const char *)bp, 120 "%m/%d/%y", tm))) 121 return (0); 122 break; 123 124 case 'R': /* The time as "%H:%M". */ 125 LEGAL_ALT(0); 126 if (!(bp = (const u_char *)strptime((const char *)bp, 127 "%H:%M", tm))) 128 return (0); 129 break; 130 131 case 'r': /* The time in 12-hour clock representation. */ 132 LEGAL_ALT(0); 133 if (!(bp = (const u_char *)strptime((const char *)bp, 134 _ctloc(t_fmt_ampm), tm))) 135 return (0); 136 break; 137 138 case 'T': /* The time as "%H:%M:%S". */ 139 LEGAL_ALT(0); 140 if (!(bp = (const u_char *)strptime((const char *)bp, 141 "%H:%M:%S", tm))) 142 return (0); 143 break; 144 145 case 'X': /* The time, using the locale's format. */ 146 LEGAL_ALT(ALT_E); 147 if (!(bp = (const u_char *)strptime((const char *)bp, 148 _ctloc(t_fmt), tm))) 149 return (0); 150 break; 151 152 case 'x': /* The date, using the locale's format. */ 153 LEGAL_ALT(ALT_E); 154 if (!(bp = (const u_char *)strptime((const char *)bp, 155 _ctloc(d_fmt), tm))) 156 return (0); 157 break; 158 159 /* 160 * "Elementary" conversion rules. 161 */ 162 case 'A': /* The day of week, using the locale's form. */ 163 case 'a': 164 LEGAL_ALT(0); 165 for (i = 0; i < 7; i++) { 166 /* Full name. */ 167 len = strlen(_ctloc(day[i])); 168 if (strncasecmp(_ctloc(day[i]), 169 (const char *)bp, len) == 0) 170 break; 171 172 /* Abbreviated name. */ 173 len = strlen(_ctloc(abday[i])); 174 if (strncasecmp(_ctloc(abday[i]), 175 (const char *)bp, len) == 0) 176 break; 177 } 178 179 /* Nothing matched. */ 180 if (i == 7) 181 return (0); 182 183 tm->tm_wday = i; 184 bp += len; 185 break; 186 187 case 'B': /* The month, using the locale's form. */ 188 case 'b': 189 case 'h': 190 LEGAL_ALT(0); 191 for (i = 0; i < 12; i++) { 192 /* Full name. */ 193 len = strlen(_ctloc(mon[i])); 194 if (strncasecmp(_ctloc(mon[i]), 195 (const char *)bp, len) == 0) 196 break; 197 198 /* Abbreviated name. */ 199 len = strlen(_ctloc(abmon[i])); 200 if (strncasecmp(_ctloc(abmon[i]), 201 (const char *)bp, len) == 0) 202 break; 203 } 204 205 /* Nothing matched. */ 206 if (i == 12) 207 return (0); 208 209 tm->tm_mon = i; 210 bp += len; 211 break; 212 213 case 'C': /* The century number. */ 214 LEGAL_ALT(ALT_E); 215 if (!(conv_num(&bp, &i, 0, 99))) 216 return (0); 217 218 if (split_year) { 219 tm->tm_year = (tm->tm_year % 100) + (i * 100); 220 } else { 221 tm->tm_year = i * 100; 222 split_year = 1; 223 } 224 break; 225 226 case 'd': /* The day of month. */ 227 case 'e': 228 LEGAL_ALT(ALT_O); 229 if (!(conv_num(&bp, &tm->tm_mday, 1, 31))) 230 return (0); 231 break; 232 233 case 'k': /* The hour (24-hour clock representation). */ 234 LEGAL_ALT(0); 235 /* FALLTHROUGH */ 236 case 'H': 237 LEGAL_ALT(ALT_O); 238 if (!(conv_num(&bp, &tm->tm_hour, 0, 23))) 239 return (0); 240 break; 241 242 case 'l': /* The hour (12-hour clock representation). */ 243 LEGAL_ALT(0); 244 /* FALLTHROUGH */ 245 case 'I': 246 LEGAL_ALT(ALT_O); 247 if (!(conv_num(&bp, &tm->tm_hour, 1, 12))) 248 return (0); 249 if (tm->tm_hour == 12) 250 tm->tm_hour = 0; 251 break; 252 253 case 'j': /* The day of year. */ 254 LEGAL_ALT(0); 255 if (!(conv_num(&bp, &i, 1, 366))) 256 return (0); 257 tm->tm_yday = i - 1; 258 break; 259 260 case 'M': /* The minute. */ 261 LEGAL_ALT(ALT_O); 262 if (!(conv_num(&bp, &tm->tm_min, 0, 59))) 263 return (0); 264 break; 265 266 case 'm': /* The month. */ 267 LEGAL_ALT(ALT_O); 268 if (!(conv_num(&bp, &i, 1, 12))) 269 return (0); 270 tm->tm_mon = i - 1; 271 break; 272 273 case 'p': /* The locale's equivalent of AM/PM. */ 274 LEGAL_ALT(0); 275 /* AM? */ 276 if (strcasecmp(_ctloc(am_pm[0]), 277 (const char *)bp) == 0) { 278 if (tm->tm_hour > 11) 279 return (0); 280 281 bp += strlen(_ctloc(am_pm[0])); 282 break; 283 } 284 /* PM? */ 285 else if (strcasecmp(_ctloc(am_pm[1]), 286 (const char *)bp) == 0) { 287 if (tm->tm_hour > 11) 288 return (0); 289 290 tm->tm_hour += 12; 291 bp += strlen(_ctloc(am_pm[1])); 292 break; 293 } 294 295 /* Nothing matched. */ 296 return (0); 297 298 case 'S': /* The seconds. */ 299 LEGAL_ALT(ALT_O); 300 if (!(conv_num(&bp, &tm->tm_sec, 0, 61))) 301 return (0); 302 break; 303 304 case 'U': /* The week of year, beginning on sunday. */ 305 case 'W': /* The week of year, beginning on monday. */ 306 LEGAL_ALT(ALT_O); 307 /* 308 * XXX This is bogus, as we can not assume any valid 309 * information present in the tm structure at this 310 * point to calculate a real value, so just check the 311 * range for now. 312 */ 313 if (!(conv_num(&bp, &i, 0, 53))) 314 return (0); 315 break; 316 317 case 'w': /* The day of week, beginning on sunday. */ 318 LEGAL_ALT(ALT_O); 319 if (!(conv_num(&bp, &tm->tm_wday, 0, 6))) 320 return (0); 321 break; 322 323 case 'Y': /* The year. */ 324 LEGAL_ALT(ALT_E); 325 if (!(conv_num(&bp, &i, 0, 9999))) 326 return (0); 327 328 tm->tm_year = i - TM_YEAR_BASE; 329 break; 330 331 case 'y': /* The year within 100 years of the epoch. */ 332 LEGAL_ALT(ALT_E | ALT_O); 333 if (!(conv_num(&bp, &i, 0, 99))) 334 return (0); 335 336 if (split_year) { 337 tm->tm_year = ((tm->tm_year / 100) * 100) + i; 338 break; 339 } 340 split_year = 1; 341 if (i <= 68) 342 tm->tm_year = i + 2000 - TM_YEAR_BASE; 343 else 344 tm->tm_year = i + 1900 - TM_YEAR_BASE; 345 break; 346 347 /* 348 * Miscellaneous conversions. 349 */ 350 case 'n': /* Any kind of white-space. */ 351 case 't': 352 LEGAL_ALT(0); 353 while (isspace(*bp)) 354 bp++; 355 break; 356 357 358 default: /* Unknown/unsupported conversion. */ 359 return (0); 360 } 361 362 363 } 364 365 /* LINTED functional specification */ 366 return ((char *)bp); 367 } 368 369 370 static int 371 conv_num(const unsigned char **buf, int *dest, int llim, int ulim) 372 { 373 int result = 0; 374 375 /* The limit also determines the number of valid digits. */ 376 int rulim = ulim; 377 378 if (**buf < '0' || **buf > '9') 379 return (0); 380 381 do { 382 result *= 10; 383 result += *(*buf)++ - '0'; 384 rulim /= 10; 385 } while ((result * 10 <= ulim) && rulim && **buf >= '0' && **buf <= '9'); 386 387 if (result < llim || result > ulim) 388 return (0); 389 390 *dest = result; 391 return (1); 392 } 393