1 %{ 2 /* $OpenBSD: date.y,v 1.10 2010/07/31 08:54:42 ray Exp $ */ 3 4 /* 5 ** Originally written by Steven M. Bellovin <smb@research.att.com> while 6 ** at the University of North Carolina at Chapel Hill. Later tweaked by 7 ** a couple of people on Usenet. Completely overhauled by Rich $alz 8 ** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990; 9 ** 10 ** This grammar has 10 shift/reduce conflicts. 11 ** 12 ** This code is in the public domain and has no copyright. 13 */ 14 /* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */ 15 /* SUPPRESS 288 on yyerrlab *//* Label unused */ 16 17 #include <sys/timeb.h> 18 19 #include <ctype.h> 20 #include <err.h> 21 #include <string.h> 22 23 #include "rcsprog.h" 24 25 #define YEAR_EPOCH 1970 26 #define YEAR_TMORIGIN 1900 27 #define HOUR(x) ((time_t)(x) * 60) 28 #define SECSPERDAY (24L * 60L * 60L) 29 30 31 /* An entry in the lexical lookup table */ 32 typedef struct _TABLE { 33 char *name; 34 int type; 35 time_t value; 36 } TABLE; 37 38 39 /* Daylight-savings mode: on, off, or not yet known. */ 40 typedef enum _DSTMODE { 41 DSTon, DSToff, DSTmaybe 42 } DSTMODE; 43 44 /* Meridian: am, pm, or 24-hour style. */ 45 typedef enum _MERIDIAN { 46 MERam, MERpm, MER24 47 } MERIDIAN; 48 49 50 /* 51 * Global variables. We could get rid of most of these by using a good 52 * union as the yacc stack. (This routine was originally written before 53 * yacc had the %union construct.) Maybe someday; right now we only use 54 * the %union very rarely. 55 */ 56 static const char *yyInput; 57 static DSTMODE yyDSTmode; 58 static time_t yyDayOrdinal; 59 static time_t yyDayNumber; 60 static int yyHaveDate; 61 static int yyHaveDay; 62 static int yyHaveRel; 63 static int yyHaveTime; 64 static int yyHaveZone; 65 static time_t yyTimezone; 66 static time_t yyDay; 67 static time_t yyHour; 68 static time_t yyMinutes; 69 static time_t yyMonth; 70 static time_t yySeconds; 71 static time_t yyYear; 72 static MERIDIAN yyMeridian; 73 static time_t yyRelMonth; 74 static time_t yyRelSeconds; 75 76 77 static int yyerror(const char *); 78 static int yylex(void); 79 static int yyparse(void); 80 static int lookup(char *); 81 82 %} 83 84 %union { 85 time_t Number; 86 enum _MERIDIAN Meridian; 87 } 88 89 %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT 90 %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST 91 92 %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT 93 %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE 94 %type <Meridian> tMERIDIAN o_merid 95 96 %% 97 98 spec : /* NULL */ 99 | spec item 100 ; 101 102 item : time { 103 yyHaveTime++; 104 } 105 | zone { 106 yyHaveZone++; 107 } 108 | date { 109 yyHaveDate++; 110 } 111 | day { 112 yyHaveDay++; 113 } 114 | rel { 115 yyHaveRel++; 116 } 117 | number 118 ; 119 120 time : tUNUMBER tMERIDIAN { 121 yyHour = $1; 122 yyMinutes = 0; 123 yySeconds = 0; 124 yyMeridian = $2; 125 } 126 | tUNUMBER ':' tUNUMBER o_merid { 127 yyHour = $1; 128 yyMinutes = $3; 129 yySeconds = 0; 130 yyMeridian = $4; 131 } 132 | tUNUMBER ':' tUNUMBER tSNUMBER { 133 yyHour = $1; 134 yyMinutes = $3; 135 yyMeridian = MER24; 136 yyDSTmode = DSToff; 137 yyTimezone = - ($4 % 100 + ($4 / 100) * 60); 138 } 139 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { 140 yyHour = $1; 141 yyMinutes = $3; 142 yySeconds = $5; 143 yyMeridian = $6; 144 } 145 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { 146 yyHour = $1; 147 yyMinutes = $3; 148 yySeconds = $5; 149 yyMeridian = MER24; 150 yyDSTmode = DSToff; 151 yyTimezone = - ($6 % 100 + ($6 / 100) * 60); 152 } 153 ; 154 155 zone : tZONE { 156 yyTimezone = $1; 157 yyDSTmode = DSToff; 158 } 159 | tDAYZONE { 160 yyTimezone = $1; 161 yyDSTmode = DSTon; 162 } 163 | tZONE tDST { 164 yyTimezone = $1; 165 yyDSTmode = DSTon; 166 } 167 ; 168 169 day : tDAY { 170 yyDayOrdinal = 1; 171 yyDayNumber = $1; 172 } 173 | tDAY ',' { 174 yyDayOrdinal = 1; 175 yyDayNumber = $1; 176 } 177 | tUNUMBER tDAY { 178 yyDayOrdinal = $1; 179 yyDayNumber = $2; 180 } 181 ; 182 183 date : tUNUMBER '/' tUNUMBER { 184 yyMonth = $1; 185 yyDay = $3; 186 } 187 | tUNUMBER '/' tUNUMBER '/' tUNUMBER { 188 if ($1 >= 100) { 189 yyYear = $1; 190 yyMonth = $3; 191 yyDay = $5; 192 } else { 193 yyMonth = $1; 194 yyDay = $3; 195 yyYear = $5; 196 } 197 } 198 | tUNUMBER tSNUMBER tSNUMBER { 199 /* ISO 8601 format. yyyy-mm-dd. */ 200 yyYear = $1; 201 yyMonth = -$2; 202 yyDay = -$3; 203 } 204 | tUNUMBER tMONTH tSNUMBER { 205 /* e.g. 17-JUN-1992. */ 206 yyDay = $1; 207 yyMonth = $2; 208 yyYear = -$3; 209 } 210 | tMONTH tUNUMBER { 211 yyMonth = $1; 212 yyDay = $2; 213 } 214 | tMONTH tUNUMBER ',' tUNUMBER { 215 yyMonth = $1; 216 yyDay = $2; 217 yyYear = $4; 218 } 219 | tUNUMBER tMONTH { 220 yyMonth = $2; 221 yyDay = $1; 222 } 223 | tUNUMBER tMONTH tUNUMBER { 224 yyMonth = $2; 225 yyDay = $1; 226 yyYear = $3; 227 } 228 ; 229 230 rel : relunit tAGO { 231 yyRelSeconds = -yyRelSeconds; 232 yyRelMonth = -yyRelMonth; 233 } 234 | relunit 235 ; 236 237 relunit : tUNUMBER tMINUTE_UNIT { 238 yyRelSeconds += $1 * $2 * 60L; 239 } 240 | tSNUMBER tMINUTE_UNIT { 241 yyRelSeconds += $1 * $2 * 60L; 242 } 243 | tMINUTE_UNIT { 244 yyRelSeconds += $1 * 60L; 245 } 246 | tSNUMBER tSEC_UNIT { 247 yyRelSeconds += $1; 248 } 249 | tUNUMBER tSEC_UNIT { 250 yyRelSeconds += $1; 251 } 252 | tSEC_UNIT { 253 yyRelSeconds++; 254 } 255 | tSNUMBER tMONTH_UNIT { 256 yyRelMonth += $1 * $2; 257 } 258 | tUNUMBER tMONTH_UNIT { 259 yyRelMonth += $1 * $2; 260 } 261 | tMONTH_UNIT { 262 yyRelMonth += $1; 263 } 264 ; 265 266 number : tUNUMBER { 267 if (yyHaveTime && yyHaveDate && !yyHaveRel) 268 yyYear = $1; 269 else { 270 if ($1 > 10000) { 271 yyHaveDate++; 272 yyDay= ($1)%100; 273 yyMonth= ($1/100)%100; 274 yyYear = $1/10000; 275 } else { 276 yyHaveTime++; 277 if ($1 < 100) { 278 yyHour = $1; 279 yyMinutes = 0; 280 } else { 281 yyHour = $1 / 100; 282 yyMinutes = $1 % 100; 283 } 284 yySeconds = 0; 285 yyMeridian = MER24; 286 } 287 } 288 } 289 ; 290 291 o_merid : /* NULL */ { 292 $$ = MER24; 293 } 294 | tMERIDIAN { 295 $$ = $1; 296 } 297 ; 298 299 %% 300 301 /* Month and day table. */ 302 static TABLE const MonthDayTable[] = { 303 { "january", tMONTH, 1 }, 304 { "february", tMONTH, 2 }, 305 { "march", tMONTH, 3 }, 306 { "april", tMONTH, 4 }, 307 { "may", tMONTH, 5 }, 308 { "june", tMONTH, 6 }, 309 { "july", tMONTH, 7 }, 310 { "august", tMONTH, 8 }, 311 { "september", tMONTH, 9 }, 312 { "sept", tMONTH, 9 }, 313 { "october", tMONTH, 10 }, 314 { "november", tMONTH, 11 }, 315 { "december", tMONTH, 12 }, 316 { "sunday", tDAY, 0 }, 317 { "monday", tDAY, 1 }, 318 { "tuesday", tDAY, 2 }, 319 { "tues", tDAY, 2 }, 320 { "wednesday", tDAY, 3 }, 321 { "wednes", tDAY, 3 }, 322 { "thursday", tDAY, 4 }, 323 { "thur", tDAY, 4 }, 324 { "thurs", tDAY, 4 }, 325 { "friday", tDAY, 5 }, 326 { "saturday", tDAY, 6 }, 327 { NULL } 328 }; 329 330 /* Time units table. */ 331 static TABLE const UnitsTable[] = { 332 { "year", tMONTH_UNIT, 12 }, 333 { "month", tMONTH_UNIT, 1 }, 334 { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, 335 { "week", tMINUTE_UNIT, 7 * 24 * 60 }, 336 { "day", tMINUTE_UNIT, 1 * 24 * 60 }, 337 { "hour", tMINUTE_UNIT, 60 }, 338 { "minute", tMINUTE_UNIT, 1 }, 339 { "min", tMINUTE_UNIT, 1 }, 340 { "second", tSEC_UNIT, 1 }, 341 { "sec", tSEC_UNIT, 1 }, 342 { NULL } 343 }; 344 345 /* Assorted relative-time words. */ 346 static TABLE const OtherTable[] = { 347 { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, 348 { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, 349 { "today", tMINUTE_UNIT, 0 }, 350 { "now", tMINUTE_UNIT, 0 }, 351 { "last", tUNUMBER, -1 }, 352 { "this", tMINUTE_UNIT, 0 }, 353 { "next", tUNUMBER, 2 }, 354 { "first", tUNUMBER, 1 }, 355 /* { "second", tUNUMBER, 2 }, */ 356 { "third", tUNUMBER, 3 }, 357 { "fourth", tUNUMBER, 4 }, 358 { "fifth", tUNUMBER, 5 }, 359 { "sixth", tUNUMBER, 6 }, 360 { "seventh", tUNUMBER, 7 }, 361 { "eighth", tUNUMBER, 8 }, 362 { "ninth", tUNUMBER, 9 }, 363 { "tenth", tUNUMBER, 10 }, 364 { "eleventh", tUNUMBER, 11 }, 365 { "twelfth", tUNUMBER, 12 }, 366 { "ago", tAGO, 1 }, 367 { NULL } 368 }; 369 370 /* The timezone table. */ 371 /* Some of these are commented out because a time_t can't store a float. */ 372 static TABLE const TimezoneTable[] = { 373 { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ 374 { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */ 375 { "utc", tZONE, HOUR( 0) }, 376 { "wet", tZONE, HOUR( 0) }, /* Western European */ 377 { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ 378 { "wat", tZONE, HOUR( 1) }, /* West Africa */ 379 { "at", tZONE, HOUR( 2) }, /* Azores */ 380 #if 0 381 /* For completeness. BST is also British Summer, and GST is 382 * also Guam Standard. */ 383 { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ 384 { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ 385 #endif 386 #if 0 387 { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */ 388 { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */ 389 { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */ 390 #endif 391 { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ 392 { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ 393 { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ 394 { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ 395 { "cst", tZONE, HOUR( 6) }, /* Central Standard */ 396 { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ 397 { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ 398 { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ 399 { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ 400 { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ 401 { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ 402 { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ 403 { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ 404 { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */ 405 { "cat", tZONE, HOUR(10) }, /* Central Alaska */ 406 { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */ 407 { "nt", tZONE, HOUR(11) }, /* Nome */ 408 { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ 409 { "cet", tZONE, -HOUR(1) }, /* Central European */ 410 { "met", tZONE, -HOUR(1) }, /* Middle European */ 411 { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ 412 { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ 413 { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */ 414 { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */ 415 { "fwt", tZONE, -HOUR(1) }, /* French Winter */ 416 { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */ 417 { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */ 418 { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */ 419 #if 0 420 { "it", tZONE, -HOUR(3.5) },/* Iran */ 421 #endif 422 { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */ 423 { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */ 424 #if 0 425 { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */ 426 #endif 427 { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */ 428 #if 0 429 /* For completeness. NST is also Newfoundland Stanard, and SST is 430 * also Swedish Summer. */ 431 { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */ 432 { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */ 433 #endif /* 0 */ 434 { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */ 435 { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */ 436 #if 0 437 { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */ 438 #endif 439 { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */ 440 { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */ 441 #if 0 442 { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */ 443 { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */ 444 #endif 445 { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ 446 { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ 447 { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */ 448 { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ 449 { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ 450 { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ 451 { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ 452 { NULL } 453 }; 454 455 /* Military timezone table. */ 456 static TABLE const MilitaryTable[] = { 457 { "a", tZONE, HOUR( 1) }, 458 { "b", tZONE, HOUR( 2) }, 459 { "c", tZONE, HOUR( 3) }, 460 { "d", tZONE, HOUR( 4) }, 461 { "e", tZONE, HOUR( 5) }, 462 { "f", tZONE, HOUR( 6) }, 463 { "g", tZONE, HOUR( 7) }, 464 { "h", tZONE, HOUR( 8) }, 465 { "i", tZONE, HOUR( 9) }, 466 { "k", tZONE, HOUR( 10) }, 467 { "l", tZONE, HOUR( 11) }, 468 { "m", tZONE, HOUR( 12) }, 469 { "n", tZONE, HOUR(- 1) }, 470 { "o", tZONE, HOUR(- 2) }, 471 { "p", tZONE, HOUR(- 3) }, 472 { "q", tZONE, HOUR(- 4) }, 473 { "r", tZONE, HOUR(- 5) }, 474 { "s", tZONE, HOUR(- 6) }, 475 { "t", tZONE, HOUR(- 7) }, 476 { "u", tZONE, HOUR(- 8) }, 477 { "v", tZONE, HOUR(- 9) }, 478 { "w", tZONE, HOUR(-10) }, 479 { "x", tZONE, HOUR(-11) }, 480 { "y", tZONE, HOUR(-12) }, 481 { "z", tZONE, HOUR( 0) }, 482 { NULL } 483 }; 484 485 486 static int 487 yyerror(const char *s) 488 { 489 char *str; 490 491 if (isspace(yyInput[0]) || !isprint(yyInput[0])) 492 (void)xasprintf(&str, 493 "%s: unexpected char 0x%02x in date string", s, yyInput[0]); 494 else 495 (void)xasprintf(&str, "%s: unexpected %s in date string", 496 s, yyInput); 497 498 warnx("%s", str); 499 xfree(str); 500 return (0); 501 } 502 503 504 static time_t 505 ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian) 506 { 507 if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) 508 return (-1); 509 510 switch (Meridian) { 511 case MER24: 512 if (Hours < 0 || Hours > 23) 513 return (-1); 514 return (Hours * 60L + Minutes) * 60L + Seconds; 515 case MERam: 516 if (Hours < 1 || Hours > 12) 517 return (-1); 518 if (Hours == 12) 519 Hours = 0; 520 return (Hours * 60L + Minutes) * 60L + Seconds; 521 case MERpm: 522 if (Hours < 1 || Hours > 12) 523 return (-1); 524 if (Hours == 12) 525 Hours = 0; 526 return ((Hours + 12) * 60L + Minutes) * 60L + Seconds; 527 default: 528 return (-1); 529 } 530 /* NOTREACHED */ 531 } 532 533 534 /* Year is either 535 * A negative number, which means to use its absolute value (why?) 536 * A number from 0 to 99, which means a year from 1900 to 1999, or 537 * The actual year (>=100). 538 */ 539 static time_t 540 Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes, 541 time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode) 542 { 543 static int DaysInMonth[12] = { 544 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 545 }; 546 time_t tod; 547 time_t julian; 548 int i; 549 550 if (Year < 0) 551 Year = -Year; 552 if (Year < 69) 553 Year += 2000; 554 else if (Year < 100) { 555 Year += 1900; 556 if (Year < YEAR_EPOCH) 557 Year += 100; 558 } 559 DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) 560 ? 29 : 28; 561 /* Checking for 2038 bogusly assumes that time_t is 32 bits. But 562 I'm too lazy to try to check for time_t overflow in another way. */ 563 if (Year < YEAR_EPOCH || Year > 2038 || Month < 1 || Month > 12 || 564 /* Lint fluff: "conversion from long may lose accuracy" */ 565 Day < 1 || Day > DaysInMonth[(int)--Month]) 566 return (-1); 567 568 for (julian = Day - 1, i = 0; i < Month; i++) 569 julian += DaysInMonth[i]; 570 571 for (i = YEAR_EPOCH; i < Year; i++) 572 julian += 365 + (i % 4 == 0); 573 julian *= SECSPERDAY; 574 julian += yyTimezone * 60L; 575 576 if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0) 577 return (-1); 578 julian += tod; 579 if ((DSTmode == DSTon) || 580 (DSTmode == DSTmaybe && localtime(&julian)->tm_isdst)) 581 julian -= 60 * 60; 582 return (julian); 583 } 584 585 586 static time_t 587 DSTcorrect(time_t Start, time_t Future) 588 { 589 time_t StartDay; 590 time_t FutureDay; 591 592 StartDay = (localtime(&Start)->tm_hour + 1) % 24; 593 FutureDay = (localtime(&Future)->tm_hour + 1) % 24; 594 return (Future - Start) + (StartDay - FutureDay) * 60L * 60L; 595 } 596 597 598 static time_t 599 RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber) 600 { 601 struct tm *tm; 602 time_t now; 603 604 now = Start; 605 tm = localtime(&now); 606 now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7); 607 now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1); 608 return DSTcorrect(Start, now); 609 } 610 611 612 static time_t 613 RelativeMonth(time_t Start, time_t RelMonth) 614 { 615 struct tm *tm; 616 time_t Month; 617 time_t Year; 618 619 if (RelMonth == 0) 620 return (0); 621 tm = localtime(&Start); 622 Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth; 623 Year = Month / 12; 624 Month = Month % 12 + 1; 625 return DSTcorrect(Start, 626 Convert(Month, (time_t)tm->tm_mday, Year, 627 (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec, 628 MER24, DSTmaybe)); 629 } 630 631 632 static int 633 lookup(char *buff) 634 { 635 size_t len; 636 char *p, *q; 637 int i, abbrev; 638 const TABLE *tp; 639 640 /* Make it lowercase. */ 641 for (p = buff; *p; p++) 642 if (isupper(*p)) 643 *p = tolower(*p); 644 645 if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) { 646 yylval.Meridian = MERam; 647 return (tMERIDIAN); 648 } 649 if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) { 650 yylval.Meridian = MERpm; 651 return (tMERIDIAN); 652 } 653 654 len = strlen(buff); 655 /* See if we have an abbreviation for a month. */ 656 if (len == 3) 657 abbrev = 1; 658 else if (len == 4 && buff[3] == '.') { 659 abbrev = 1; 660 buff[3] = '\0'; 661 --len; 662 } else 663 abbrev = 0; 664 665 for (tp = MonthDayTable; tp->name; tp++) { 666 if (abbrev) { 667 if (strncmp(buff, tp->name, 3) == 0) { 668 yylval.Number = tp->value; 669 return (tp->type); 670 } 671 } else if (strcmp(buff, tp->name) == 0) { 672 yylval.Number = tp->value; 673 return (tp->type); 674 } 675 } 676 677 for (tp = TimezoneTable; tp->name; tp++) 678 if (strcmp(buff, tp->name) == 0) { 679 yylval.Number = tp->value; 680 return (tp->type); 681 } 682 683 if (strcmp(buff, "dst") == 0) 684 return (tDST); 685 686 for (tp = UnitsTable; tp->name; tp++) 687 if (strcmp(buff, tp->name) == 0) { 688 yylval.Number = tp->value; 689 return (tp->type); 690 } 691 692 /* Strip off any plural and try the units table again. */ 693 if (len != 0 && buff[len - 1] == 's') { 694 buff[len - 1] = '\0'; 695 for (tp = UnitsTable; tp->name; tp++) 696 if (strcmp(buff, tp->name) == 0) { 697 yylval.Number = tp->value; 698 return (tp->type); 699 } 700 buff[len - 1] = 's'; /* Put back for "this" in OtherTable. */ 701 } 702 703 for (tp = OtherTable; tp->name; tp++) 704 if (strcmp(buff, tp->name) == 0) { 705 yylval.Number = tp->value; 706 return (tp->type); 707 } 708 709 /* Military timezones. */ 710 if (len == 1 && isalpha(*buff)) { 711 for (tp = MilitaryTable; tp->name; tp++) 712 if (strcmp(buff, tp->name) == 0) { 713 yylval.Number = tp->value; 714 return (tp->type); 715 } 716 } 717 718 /* Drop out any periods and try the timezone table again. */ 719 for (i = 0, p = q = buff; *q; q++) 720 if (*q != '.') 721 *p++ = *q; 722 else 723 i++; 724 *p = '\0'; 725 if (i) 726 for (tp = TimezoneTable; tp->name; tp++) 727 if (strcmp(buff, tp->name) == 0) { 728 yylval.Number = tp->value; 729 return (tp->type); 730 } 731 732 return (tID); 733 } 734 735 736 static int 737 yylex(void) 738 { 739 char c, *p, buff[20]; 740 int count, sign; 741 742 for (;;) { 743 while (isspace(*yyInput)) 744 yyInput++; 745 746 if (isdigit(c = *yyInput) || c == '-' || c == '+') { 747 if (c == '-' || c == '+') { 748 sign = c == '-' ? -1 : 1; 749 if (!isdigit(*++yyInput)) 750 /* skip the '-' sign */ 751 continue; 752 } 753 else 754 sign = 0; 755 756 for (yylval.Number = 0; isdigit(c = *yyInput++); ) 757 yylval.Number = 10 * yylval.Number + c - '0'; 758 yyInput--; 759 if (sign < 0) 760 yylval.Number = -yylval.Number; 761 return sign ? tSNUMBER : tUNUMBER; 762 } 763 764 if (isalpha(c)) { 765 for (p = buff; isalpha(c = *yyInput++) || c == '.'; ) 766 if (p < &buff[sizeof buff - 1]) 767 *p++ = c; 768 *p = '\0'; 769 yyInput--; 770 return lookup(buff); 771 } 772 if (c != '(') 773 return *yyInput++; 774 775 count = 0; 776 do { 777 c = *yyInput++; 778 if (c == '\0') 779 return (c); 780 if (c == '(') 781 count++; 782 else if (c == ')') 783 count--; 784 } while (count > 0); 785 } 786 } 787 788 /* Yield A - B, measured in seconds. */ 789 static long 790 difftm(struct tm *a, struct tm *b) 791 { 792 int ay = a->tm_year + (YEAR_TMORIGIN - 1); 793 int by = b->tm_year + (YEAR_TMORIGIN - 1); 794 int days = ( 795 /* difference in day of year */ 796 a->tm_yday - b->tm_yday 797 /* + intervening leap days */ 798 + ((ay >> 2) - (by >> 2)) 799 - (ay/100 - by/100) 800 + ((ay/100 >> 2) - (by/100 >> 2)) 801 /* + difference in years * 365 */ 802 + (long)(ay-by) * 365); 803 return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) 804 + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec)); 805 } 806 807 /* 808 * date_parse() 809 * 810 * Returns the number of seconds since the Epoch corresponding to the date. 811 */ 812 time_t 813 date_parse(const char *p) 814 { 815 struct tm gmt, tm; 816 time_t Start, tod, nowtime, tz; 817 818 yyInput = p; 819 820 if (time(&nowtime) == -1 || !gmtime_r(&nowtime, &gmt) || 821 !localtime_r(&nowtime, &tm)) 822 return -1; 823 824 tz = difftm(&gmt, &tm) / 60; 825 826 if (tm.tm_isdst) 827 tz += 60; 828 829 yyYear = tm.tm_year + 1900; 830 yyMonth = tm.tm_mon + 1; 831 yyDay = tm.tm_mday; 832 yyTimezone = tz; 833 yyDSTmode = DSTmaybe; 834 yyHour = 0; 835 yyMinutes = 0; 836 yySeconds = 0; 837 yyMeridian = MER24; 838 yyRelSeconds = 0; 839 yyRelMonth = 0; 840 yyHaveDate = 0; 841 yyHaveDay = 0; 842 yyHaveRel = 0; 843 yyHaveTime = 0; 844 yyHaveZone = 0; 845 846 if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 || 847 yyHaveDate > 1 || yyHaveDay > 1) 848 return (-1); 849 850 if (yyHaveDate || yyHaveTime || yyHaveDay) { 851 Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, 852 yySeconds, yyMeridian, yyDSTmode); 853 if (Start < 0) 854 return (-1); 855 } else { 856 Start = nowtime; 857 if (!yyHaveRel) 858 Start -= ((tm.tm_hour * 60L + tm.tm_min) * 60L) + 859 tm.tm_sec; 860 } 861 862 Start += yyRelSeconds; 863 Start += RelativeMonth(Start, yyRelMonth); 864 865 if (yyHaveDay && !yyHaveDate) { 866 tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber); 867 Start += tod; 868 } 869 870 return Start; 871 } 872 873 #if defined(TEST) 874 /* ARGSUSED */ 875 int 876 main(int argc, char **argv) 877 { 878 char buff[128]; 879 time_t d; 880 881 (void)printf("Enter date, or blank line to exit.\n\t> "); 882 (void)fflush(stdout); 883 while (fgets(buff, sizeof(buff), stdin) && buff[0]) { 884 d = date_parse(buff); 885 if (d == -1) 886 (void)printf("Bad format - couldn't convert.\n"); 887 else 888 (void)printf("%s", ctime(&d)); 889 (void)printf("\t> "); 890 (void)fflush(stdout); 891 } 892 893 return (0); 894 } 895 #endif /* defined(TEST) */ 896