1 /* $OpenBSD: strptime.c,v 1.11 2005/08/08 08:05:38 espie Exp $ */ 2 /* $NetBSD: strptime.c,v 1.12 1998/01/20 21:39:40 mycroft 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 "tzfile.h" 45 46 static const struct { 47 const char *abday[7]; 48 const char *day[7]; 49 const char *abmon[12]; 50 const char *mon[12]; 51 const char *am_pm[2]; 52 const char *d_t_fmt; 53 const char *d_fmt; 54 const char *t_fmt; 55 const char *t_fmt_ampm; 56 } _DefaultTimeLocale = { 57 { 58 "Sun","Mon","Tue","Wed","Thu","Fri","Sat", 59 }, 60 { 61 "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", 62 "Friday", "Saturday" 63 }, 64 { 65 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 66 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 67 }, 68 { 69 "January", "February", "March", "April", "May", "June", "July", 70 "August", "September", "October", "November", "December" 71 }, 72 { 73 "AM", "PM" 74 }, 75 "%a %b %d %H:%M:%S %Y", 76 "%m/%d/%y", 77 "%H:%M:%S", 78 "%I:%M:%S %p" 79 }; 80 81 #define _ctloc(x) (_DefaultTimeLocale.x) 82 83 /* 84 * We do not implement alternate representations. However, we always 85 * check whether a given modifier is allowed for a certain conversion. 86 */ 87 #define _ALT_E 0x01 88 #define _ALT_O 0x02 89 #define _LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); } 90 91 92 struct century_relyear { 93 int century; 94 int relyear; 95 }; 96 static int _conv_num(const unsigned char **, int *, int, int); 97 static unsigned char *_strptime(const unsigned char *, const char *, struct tm *, 98 struct century_relyear *); 99 100 101 char * 102 strptime(const char *buf, const char *fmt, struct tm *tm) 103 { 104 struct century_relyear cr; 105 cr.century = TM_YEAR_BASE; 106 cr.relyear = -1; 107 return (char*)(_strptime((const unsigned char*)buf, fmt, tm, &cr)); 108 } 109 110 static unsigned char * 111 _strptime(const unsigned char *buf, const char *fmt, struct tm *tm, struct century_relyear *cr) 112 { 113 unsigned char c; 114 const unsigned char *bp; 115 size_t len = 0; 116 int alt_format, i; 117 118 bp = (unsigned char *)buf; 119 while ((c = *fmt) != '\0') { 120 /* Clear `alternate' modifier prior to new conversion. */ 121 alt_format = 0; 122 123 /* Eat up white-space. */ 124 if (isspace(c)) { 125 while (isspace(*bp)) 126 bp++; 127 128 fmt++; 129 continue; 130 } 131 132 if ((c = *fmt++) != '%') 133 goto literal; 134 135 136 again: switch (c = *fmt++) { 137 case '%': /* "%%" is converted to "%". */ 138 literal: 139 if (c != *bp++) 140 return (NULL); 141 142 break; 143 144 /* 145 * "Alternative" modifiers. Just set the appropriate flag 146 * and start over again. 147 */ 148 case 'E': /* "%E?" alternative conversion modifier. */ 149 _LEGAL_ALT(0); 150 alt_format |= _ALT_E; 151 goto again; 152 153 case 'O': /* "%O?" alternative conversion modifier. */ 154 _LEGAL_ALT(0); 155 alt_format |= _ALT_O; 156 goto again; 157 158 /* 159 * "Complex" conversion rules, implemented through recursion. 160 */ 161 case 'c': /* Date and time, using the locale's format. */ 162 _LEGAL_ALT(_ALT_E); 163 if (!(bp = _strptime(bp, _ctloc(d_t_fmt), tm, cr))) 164 return (NULL); 165 break; 166 167 case 'D': /* The date as "%m/%d/%y". */ 168 _LEGAL_ALT(0); 169 if (!(bp = _strptime(bp, "%m/%d/%y", tm, cr))) 170 return (NULL); 171 break; 172 173 case 'R': /* The time as "%H:%M". */ 174 _LEGAL_ALT(0); 175 if (!(bp = _strptime(bp, "%H:%M", tm, cr))) 176 return (NULL); 177 break; 178 179 case 'r': /* The time as "%I:%M:%S %p". */ 180 _LEGAL_ALT(0); 181 if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, cr))) 182 return (NULL); 183 break; 184 185 case 'T': /* The time as "%H:%M:%S". */ 186 _LEGAL_ALT(0); 187 if (!(bp = _strptime(bp, "%H:%M:%S", tm, cr))) 188 return (NULL); 189 break; 190 191 case 'X': /* The time, using the locale's format. */ 192 _LEGAL_ALT(_ALT_E); 193 if (!(bp = _strptime(bp, _ctloc(t_fmt), tm, cr))) 194 return (NULL); 195 break; 196 197 case 'x': /* The date, using the locale's format. */ 198 _LEGAL_ALT(_ALT_E); 199 if (!(bp = _strptime(bp, _ctloc(d_fmt), tm, cr))) 200 return (NULL); 201 break; 202 203 /* 204 * "Elementary" conversion rules. 205 */ 206 case 'A': /* The day of week, using the locale's form. */ 207 case 'a': 208 _LEGAL_ALT(0); 209 for (i = 0; i < 7; i++) { 210 /* Full name. */ 211 len = strlen(_ctloc(day[i])); 212 if (strncasecmp(_ctloc(day[i]), (const char*)bp, len) == 0) 213 break; 214 215 /* Abbreviated name. */ 216 len = strlen(_ctloc(abday[i])); 217 if (strncasecmp(_ctloc(abday[i]), (const char*)bp, len) == 0) 218 break; 219 } 220 221 /* Nothing matched. */ 222 if (i == 7) 223 return (NULL); 224 225 tm->tm_wday = i; 226 bp += len; 227 break; 228 229 case 'B': /* The month, using the locale's form. */ 230 case 'b': 231 case 'h': 232 _LEGAL_ALT(0); 233 for (i = 0; i < 12; i++) { 234 /* Full name. */ 235 len = strlen(_ctloc(mon[i])); 236 if (strncasecmp(_ctloc(mon[i]), (const char*)bp, len) == 0) 237 break; 238 239 /* Abbreviated name. */ 240 len = strlen(_ctloc(abmon[i])); 241 if (strncasecmp(_ctloc(abmon[i]), (const char*)bp, len) == 0) 242 break; 243 } 244 245 /* Nothing matched. */ 246 if (i == 12) 247 return (NULL); 248 249 tm->tm_mon = i; 250 bp += len; 251 break; 252 253 case 'C': /* The century number. */ 254 _LEGAL_ALT(_ALT_E); 255 if (!(_conv_num(&bp, &i, 0, 99))) 256 return (NULL); 257 258 cr->century = i * 100; 259 break; 260 261 case 'd': /* The day of month. */ 262 case 'e': 263 _LEGAL_ALT(_ALT_O); 264 if (!(_conv_num(&bp, &tm->tm_mday, 1, 31))) 265 return (NULL); 266 break; 267 268 case 'k': /* The hour (24-hour clock representation). */ 269 _LEGAL_ALT(0); 270 /* FALLTHROUGH */ 271 case 'H': 272 _LEGAL_ALT(_ALT_O); 273 if (!(_conv_num(&bp, &tm->tm_hour, 0, 23))) 274 return (NULL); 275 break; 276 277 case 'l': /* The hour (12-hour clock representation). */ 278 _LEGAL_ALT(0); 279 /* FALLTHROUGH */ 280 case 'I': 281 _LEGAL_ALT(_ALT_O); 282 if (!(_conv_num(&bp, &tm->tm_hour, 1, 12))) 283 return (NULL); 284 break; 285 286 case 'j': /* The day of year. */ 287 _LEGAL_ALT(0); 288 if (!(_conv_num(&bp, &tm->tm_yday, 1, 366))) 289 return (NULL); 290 tm->tm_yday--; 291 break; 292 293 case 'M': /* The minute. */ 294 _LEGAL_ALT(_ALT_O); 295 if (!(_conv_num(&bp, &tm->tm_min, 0, 59))) 296 return (NULL); 297 break; 298 299 case 'm': /* The month. */ 300 _LEGAL_ALT(_ALT_O); 301 if (!(_conv_num(&bp, &tm->tm_mon, 1, 12))) 302 return (NULL); 303 tm->tm_mon--; 304 break; 305 306 case 'p': /* The locale's equivalent of AM/PM. */ 307 _LEGAL_ALT(0); 308 /* AM? */ 309 len = strlen(_ctloc(am_pm[0])); 310 if (strncasecmp(_ctloc(am_pm[0]), (const char*)bp, len) == 0) { 311 if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */ 312 return (NULL); 313 else if (tm->tm_hour == 12) 314 tm->tm_hour = 0; 315 316 bp += len; 317 break; 318 } 319 /* PM? */ 320 len = strlen(_ctloc(am_pm[1])); 321 if (strncasecmp(_ctloc(am_pm[1]), (const char*)bp, len) == 0) { 322 if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */ 323 return (NULL); 324 else if (tm->tm_hour < 12) 325 tm->tm_hour += 12; 326 327 bp += len; 328 break; 329 } 330 331 /* Nothing matched. */ 332 return (NULL); 333 334 case 'S': /* The seconds. */ 335 _LEGAL_ALT(_ALT_O); 336 if (!(_conv_num(&bp, &tm->tm_sec, 0, 61))) 337 return (NULL); 338 break; 339 340 case 'U': /* The week of year, beginning on sunday. */ 341 case 'W': /* The week of year, beginning on monday. */ 342 _LEGAL_ALT(_ALT_O); 343 /* 344 * XXX This is bogus, as we can not assume any valid 345 * information present in the tm structure at this 346 * point to calculate a real value, so just check the 347 * range for now. 348 */ 349 if (!(_conv_num(&bp, &i, 0, 53))) 350 return (NULL); 351 break; 352 353 case 'w': /* The day of week, beginning on sunday. */ 354 _LEGAL_ALT(_ALT_O); 355 if (!(_conv_num(&bp, &tm->tm_wday, 0, 6))) 356 return (NULL); 357 break; 358 359 case 'Y': /* The year. */ 360 _LEGAL_ALT(_ALT_E); 361 if (!(_conv_num(&bp, &i, 0, 9999))) 362 return (NULL); 363 364 cr->relyear = -1; 365 tm->tm_year = i - TM_YEAR_BASE; 366 break; 367 368 case 'y': /* The year within the century (2 digits). */ 369 _LEGAL_ALT(_ALT_E | _ALT_O); 370 if (!(_conv_num(&bp, &cr->relyear, 0, 99))) 371 return (NULL); 372 break; 373 374 /* 375 * Miscellaneous conversions. 376 */ 377 case 'n': /* Any kind of white-space. */ 378 case 't': 379 _LEGAL_ALT(0); 380 while (isspace(*bp)) 381 bp++; 382 break; 383 384 385 default: /* Unknown/unsupported conversion. */ 386 return (NULL); 387 } 388 389 390 } 391 392 /* 393 * We need to evaluate the two digit year spec (%y) 394 * last as we can get a century spec (%C) at any time. 395 */ 396 if (cr->relyear != -1) { 397 if (cr->century == TM_YEAR_BASE) { 398 if (cr->relyear <= 68) 399 tm->tm_year = cr->relyear + 2000 - TM_YEAR_BASE; 400 else 401 tm->tm_year = cr->relyear + 1900 - TM_YEAR_BASE; 402 } else { 403 tm->tm_year = cr->relyear + cr->century - TM_YEAR_BASE; 404 } 405 } 406 407 return (unsigned char*)bp; 408 } 409 410 411 static int 412 _conv_num(const unsigned char **buf, int *dest, int llim, int ulim) 413 { 414 int result = 0; 415 int rulim = ulim; 416 417 if (**buf < '0' || **buf > '9') 418 return (0); 419 420 /* we use rulim to break out of the loop when we run out of digits */ 421 do { 422 result *= 10; 423 result += *(*buf)++ - '0'; 424 rulim /= 10; 425 } while ((result * 10 <= ulim) && rulim && **buf >= '0' && **buf <= '9'); 426 427 if (result < llim || result > ulim) 428 return (0); 429 430 *dest = result; 431 return (1); 432 } 433
