1 %{ 2 /* $OpenBSD: date.y,v 1.26 2017/07/20 13:39:11 okan 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 <ctype.h> 18 #include <string.h> 19 #include <time.h> 20 21 #include "cvs.h" 22 23 #define YEAR_EPOCH 1970 24 #define YEAR_TMORIGIN 1900 25 #define HOUR(x) ((time_t)(x) * 60) 26 #define SECSPERDAY (24L * 60L * 60L) 27 28 29 /* An entry in the lexical lookup table */ 30 typedef struct _TABLE { 31 char *name; 32 int type; 33 time_t value; 34 } TABLE; 35 36 37 /* Daylight-savings mode: on, off, or not yet known. */ 38 typedef enum _DSTMODE { 39 DSTon, DSToff, DSTmaybe 40 } DSTMODE; 41 42 /* Meridian: am, pm, or 24-hour style. */ 43 typedef enum _MERIDIAN { 44 MERam, MERpm, MER24 45 } MERIDIAN; 46 47 48 /* 49 * Global variables. We could get rid of most of these by using a good 50 * union as the yacc stack. (This routine was originally written before 51 * yacc had the %union construct.) Maybe someday; right now we only use 52 * the %union very rarely. 53 */ 54 static const char *yyInput; 55 static DSTMODE yyDSTmode; 56 static time_t yyDayOrdinal; 57 static time_t yyDayNumber; 58 static int yyHaveDate; 59 static int yyHaveDay; 60 static int yyHaveRel; 61 static int yyHaveTime; 62 static int yyHaveZone; 63 static time_t yyTimezone; 64 static time_t yyDay; 65 static time_t yyHour; 66 static time_t yyMinutes; 67 static time_t yyMonth; 68 static time_t yySeconds; 69 static time_t yyYear; 70 static MERIDIAN yyMeridian; 71 static time_t yyRelMonth; 72 static time_t yyRelSeconds; 73 74 75 static int yyerror(const char *); 76 static int yylex(void); 77 static int yyparse(void); 78 static int lookup(char *); 79 80 %} 81 82 %union { 83 time_t Number; 84 enum _MERIDIAN Meridian; 85 } 86 87 %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT 88 %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST 89 90 %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT 91 %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE 92 %type <Meridian> tMERIDIAN o_merid 93 94 %% 95 96 spec : /* NULL */ 97 | spec item 98 ; 99 100 item : time { 101 yyHaveTime++; 102 } 103 | zone { 104 yyHaveZone++; 105 } 106 | date { 107 yyHaveDate++; 108 } 109 | day { 110 yyHaveDay++; 111 } 112 | rel { 113 yyHaveRel++; 114 } 115 | number 116 ; 117 118 time : tUNUMBER tMERIDIAN { 119 yyHour = $1; 120 yyMinutes = 0; 121 yySeconds = 0; 122 yyMeridian = $2; 123 } 124 | tUNUMBER ':' tUNUMBER o_merid { 125 yyHour = $1; 126 yyMinutes = $3; 127 yySeconds = 0; 128 yyMeridian = $4; 129 } 130 | tUNUMBER ':' tUNUMBER tSNUMBER { 131 yyHour = $1; 132 yyMinutes = $3; 133 yyMeridian = MER24; 134 yyDSTmode = DSToff; 135 yyTimezone = - ($4 % 100 + ($4 / 100) * 60); 136 } 137 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { 138 yyHour = $1; 139 yyMinutes = $3; 140 yySeconds = $5; 141 yyMeridian = $6; 142 } 143 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { 144 yyHour = $1; 145 yyMinutes = $3; 146 yySeconds = $5; 147 yyMeridian = MER24; 148 yyDSTmode = DSToff; 149 yyTimezone = - ($6 % 100 + ($6 / 100) * 60); 150 } 151 ; 152 153 zone : tZONE { 154 yyTimezone = $1; 155 yyDSTmode = DSToff; 156 } 157 | tDAYZONE { 158 yyTimezone = $1; 159 yyDSTmode = DSTon; 160 } 161 | tZONE tDST { 162 yyTimezone = $1; 163 yyDSTmode = DSTon; 164 } 165 ; 166 167 day : tDAY { 168 yyDayOrdinal = 1; 169 yyDayNumber = $1; 170 } 171 | tDAY ',' { 172 yyDayOrdinal = 1; 173 yyDayNumber = $1; 174 } 175 | tUNUMBER tDAY { 176 yyDayOrdinal = $1; 177 yyDayNumber = $2; 178 } 179 ; 180 181 date : tUNUMBER '/' tUNUMBER { 182 yyMonth = $1; 183 yyDay = $3; 184 } 185 | tUNUMBER '/' tUNUMBER '/' tUNUMBER { 186 if ($1 >= 100) { 187 yyYear = $1; 188 yyMonth = $3; 189 yyDay = $5; 190 } else { 191 yyMonth = $1; 192 yyDay = $3; 193 yyYear = $5; 194 } 195 } 196 | tUNUMBER tSNUMBER tSNUMBER { 197 /* ISO 8601 format. yyyy-mm-dd. */ 198 yyYear = $1; 199 yyMonth = -$2; 200 yyDay = -$3; 201 } 202 | tUNUMBER tMONTH tSNUMBER { 203 /* e.g. 17-JUN-1992. */ 204 yyDay = $1; 205 yyMonth = $2; 206 yyYear = -$3; 207 } 208 | tMONTH tUNUMBER { 209 yyMonth = $1; 210 yyDay = $2; 211 } 212 | tMONTH tUNUMBER ',' tUNUMBER { 213 yyMonth = $1; 214 yyDay = $2; 215 yyYear = $4; 216 } 217 | tUNUMBER tMONTH { 218 yyMonth = $2; 219 yyDay = $1; 220 } 221 | tUNUMBER tMONTH tUNUMBER { 222 yyMonth = $2; 223 yyDay = $1; 224 yyYear = $3; 225 } 226 ; 227 228 rel : relunit tAGO { 229 yyRelSeconds = -yyRelSeconds; 230 yyRelMonth = -yyRelMonth; 231 } 232 | relunit 233 ; 234 235 relunit : tUNUMBER tMINUTE_UNIT { 236 yyRelSeconds += $1 * $2 * 60L; 237 } 238 | tSNUMBER tMINUTE_UNIT { 239 yyRelSeconds += $1 * $2 * 60L; 240 } 241 | tMINUTE_UNIT { 242 yyRelSeconds += $1 * 60L; 243 } 244 | tSNUMBER tSEC_UNIT { 245 yyRelSeconds += $1; 246 } 247 | tUNUMBER tSEC_UNIT { 248 yyRelSeconds += $1; 249 } 250 | tSEC_UNIT { 251 yyRelSeconds++; 252 } 253 | tSNUMBER tMONTH_UNIT { 254 yyRelMonth += $1 * $2; 255 } 256 | tUNUMBER tMONTH_UNIT { 257 yyRelMonth += $1 * $2; 258 } 259 | tMONTH_UNIT { 260 yyRelMonth += $1; 261 } 262 ; 263 264 number : tUNUMBER { 265 if (yyHaveTime && yyHaveDate && !yyHaveRel) 266 yyYear = $1; 267 else { 268 if ($1 > 10000) { 269 yyHaveDate++; 270 yyDay= ($1)%100; 271 yyMonth= ($1/100)%100; 272 yyYear = $1/10000; 273 } else { 274 yyHaveTime++; 275 if ($1 < 100) { 276 yyHour = $1; 277 yyMinutes = 0; 278 } else { 279 yyHour = $1 / 100; 280 yyMinutes = $1 % 100; 281 } 282 yySeconds = 0; 283 yyMeridian = MER24; 284 } 285 } 286 } 287 ; 288 289 o_merid : /* NULL */ { 290 $$ = MER24; 291 } 292 | tMERIDIAN { 293 $$ = $1; 294 } 295 ; 296 297 %% 298 299 /* Month and day table. */ 300 static TABLE const MonthDayTable[] = { 301 { "january", tMONTH, 1 }, 302 { "february", tMONTH, 2 }, 303 { "march", tMONTH, 3 }, 304 { "april", tMONTH, 4 }, 305 { "may", tMONTH, 5 }, 306 { "june", tMONTH, 6 }, 307 { "july", tMONTH, 7 }, 308 { "august", tMONTH, 8 }, 309 { "september", tMONTH, 9 }, 310 { "sept", tMONTH, 9 }, 311 { "october", tMONTH, 10 }, 312 { "november", tMONTH, 11 }, 313 { "december", tMONTH, 12 }, 314 { "sunday", tDAY, 0 }, 315 { "monday", tDAY, 1 }, 316 { "tuesday", tDAY, 2 }, 317 { "tues", tDAY, 2 }, 318 { "wednesday", tDAY, 3 }, 319 { "wednes", tDAY, 3 }, 320 { "thursday", tDAY, 4 }, 321 { "thur", tDAY, 4 }, 322 { "thurs", tDAY, 4 }, 323 { "friday", tDAY, 5 }, 324 { "saturday", tDAY, 6 }, 325 { NULL } 326 }; 327 328 /* Time units table. */ 329 static TABLE const UnitsTable[] = { 330 { "year", tMONTH_UNIT, 12 }, 331 { "month", tMONTH_UNIT, 1 }, 332 { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, 333 { "week", tMINUTE_UNIT, 7 * 24 * 60 }, 334 { "day", tMINUTE_UNIT, 1 * 24 * 60 }, 335 { "hour", tMINUTE_UNIT, 60 }, 336 { "minute", tMINUTE_UNIT, 1 }, 337 { "min", tMINUTE_UNIT, 1 }, 338 { "second", tSEC_UNIT, 1 }, 339 { "sec", tSEC_UNIT, 1 }, 340 { NULL } 341 }; 342 343 /* Assorted relative-time words. */ 344 static TABLE const OtherTable[] = { 345 { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, 346 { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, 347 { "today", tMINUTE_UNIT, 0 }, 348 { "now", tMINUTE_UNIT, 0 }, 349 { "last", tUNUMBER, -1 }, 350 { "this", tMINUTE_UNIT, 0 }, 351 { "next", tUNUMBER, 2 }, 352 { "first", tUNUMBER, 1 }, 353 /* { "second", tUNUMBER, 2 }, */ 354 { "third", tUNUMBER, 3 }, 355 { "fourth", tUNUMBER, 4 }, 356 { "fifth", tUNUMBER, 5 }, 357 { "sixth", tUNUMBER, 6 }, 358 { "seventh", tUNUMBER, 7 }, 359 { "eighth", tUNUMBER, 8 }, 360 { "ninth", tUNUMBER, 9 }, 361 { "tenth", tUNUMBER, 10 }, 362 { "eleventh", tUNUMBER, 11 }, 363 { "twelfth", tUNUMBER, 12 }, 364 { "ago", tAGO, 1 }, 365 { NULL } 366 }; 367 368 /* The timezone table. */ 369 /* Some of these are commented out because a time_t can't store a float. */ 370 static TABLE const TimezoneTable[] = { 371 { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ 372 { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */ 373 { "utc", tZONE, HOUR( 0) }, 374 { "wet", tZONE, HOUR( 0) }, /* Western European */ 375 { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ 376 { "wat", tZONE, HOUR( 1) }, /* West Africa */ 377 { "at", tZONE, HOUR( 2) }, /* Azores */ 378 #if 0 379 /* For completeness. BST is also British Summer, and GST is 380 * also Guam Standard. */ 381 { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ 382 { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ 383 #endif 384 #if 0 385 { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */ 386 { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */ 387 { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */ 388 #endif 389 { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ 390 { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ 391 { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ 392 { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ 393 { "cst", tZONE, HOUR( 6) }, /* Central Standard */ 394 { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ 395 { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ 396 { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ 397 { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ 398 { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ 399 { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ 400 { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ 401 { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ 402 { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */ 403 { "cat", tZONE, HOUR(10) }, /* Central Alaska */ 404 { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */ 405 { "nt", tZONE, HOUR(11) }, /* Nome */ 406 { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ 407 { "cet", tZONE, -HOUR(1) }, /* Central European */ 408 { "met", tZONE, -HOUR(1) }, /* Middle European */ 409 { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ 410 { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ 411 { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */ 412 { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */ 413 { "fwt", tZONE, -HOUR(1) }, /* French Winter */ 414 { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */ 415 { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */ 416 { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */ 417 #if 0 418 { "it", tZONE, -HOUR(3.5) },/* Iran */ 419 #endif 420 { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */ 421 { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */ 422 #if 0 423 { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */ 424 #endif 425 { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */ 426 #if 0 427 /* For completeness. NST is also Newfoundland Stanard, and SST is 428 * also Swedish Summer. */ 429 { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */ 430 { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */ 431 #endif /* 0 */ 432 { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */ 433 { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */ 434 #if 0 435 { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */ 436 #endif 437 { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */ 438 { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */ 439 #if 0 440 { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */ 441 { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */ 442 #endif 443 { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ 444 { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ 445 { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */ 446 { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ 447 { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ 448 { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ 449 { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ 450 { NULL } 451 }; 452 453 /* Military timezone table. */ 454 static TABLE const MilitaryTable[] = { 455 { "a", tZONE, HOUR( 1) }, 456 { "b", tZONE, HOUR( 2) }, 457 { "c", tZONE, HOUR( 3) }, 458 { "d", tZONE, HOUR( 4) }, 459 { "e", tZONE, HOUR( 5) }, 460 { "f", tZONE, HOUR( 6) }, 461 { "g", tZONE, HOUR( 7) }, 462 { "h", tZONE, HOUR( 8) }, 463 { "i", tZONE, HOUR( 9) }, 464 { "k", tZONE, HOUR( 10) }, 465 { "l", tZONE, HOUR( 11) }, 466 { "m", tZONE, HOUR( 12) }, 467 { "n", tZONE, HOUR(- 1) }, 468 { "o", tZONE, HOUR(- 2) }, 469 { "p", tZONE, HOUR(- 3) }, 470 { "q", tZONE, HOUR(- 4) }, 471 { "r", tZONE, HOUR(- 5) }, 472 { "s", tZONE, HOUR(- 6) }, 473 { "t", tZONE, HOUR(- 7) }, 474 { "u", tZONE, HOUR(- 8) }, 475 { "v", tZONE, HOUR(- 9) }, 476 { "w", tZONE, HOUR(-10) }, 477 { "x", tZONE, HOUR(-11) }, 478 { "y", tZONE, HOUR(-12) }, 479 { "z", tZONE, HOUR( 0) }, 480 { NULL } 481 }; 482 483 484 static int 485 yyerror(const char *s) 486 { 487 #if !defined(TEST) 488 char *str; 489 490 (void)xasprintf(&str, "parsing date string: %s", s); 491 cvs_log(LP_ERR, "%s", str); 492 free(str); 493 #endif 494 return (0); 495 } 496 497 498 static time_t 499 ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian) 500 { 501 if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) 502 return (-1); 503 504 switch (Meridian) { 505 case MER24: 506 if (Hours < 0 || Hours > 23) 507 return (-1); 508 return (Hours * 60L + Minutes) * 60L + Seconds; 509 case MERam: 510 if (Hours < 1 || Hours > 12) 511 return (-1); 512 if (Hours == 12) 513 Hours = 0; 514 return (Hours * 60L + Minutes) * 60L + Seconds; 515 case MERpm: 516 if (Hours < 1 || Hours > 12) 517 return (-1); 518 if (Hours == 12) 519 Hours = 0; 520 return ((Hours + 12) * 60L + Minutes) * 60L + Seconds; 521 default: 522 return (-1); 523 } 524 /* NOTREACHED */ 525 } 526 527 528 /* Year is either 529 * A negative number, which means to use its absolute value (why?) 530 * A number from 0 to 99, which means a year from 1900 to 1999, or 531 * The actual year (>=100). 532 */ 533 static time_t 534 Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes, 535 time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode) 536 { 537 static int DaysInMonth[12] = { 538 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 539 }; 540 time_t tod; 541 time_t julian; 542 int i; 543 544 if (Year < 0) 545 Year = -Year; 546 if (Year < 69) 547 Year += 2000; 548 else if (Year < 100) { 549 Year += 1900; 550 if (Year < YEAR_EPOCH) 551 Year += 100; 552 } 553 DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) 554 ? 29 : 28; 555 /* XXX Sloppily check for 2038 if time_t is 32 bits */ 556 if (Year < YEAR_EPOCH || 557 (sizeof(time_t) == sizeof(int) && Year > 2038) || 558 Month < 1 || Month > 12 || 559 /* Lint fluff: "conversion from long may lose accuracy" */ 560 Day < 1 || Day > DaysInMonth[(int)--Month]) 561 return (-1); 562 563 for (julian = Day - 1, i = 0; i < Month; i++) 564 julian += DaysInMonth[i]; 565 566 for (i = YEAR_EPOCH; i < Year; i++) 567 julian += 365 + (i % 4 == 0); 568 julian *= SECSPERDAY; 569 julian += yyTimezone * 60L; 570 571 if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0) 572 return (-1); 573 julian += tod; 574 if ((DSTmode == DSTon) || 575 (DSTmode == DSTmaybe && localtime(&julian)->tm_isdst)) 576 julian -= 60 * 60; 577 return (julian); 578 } 579 580 581 static time_t 582 DSTcorrect(time_t Start, time_t Future) 583 { 584 time_t StartDay; 585 time_t FutureDay; 586 587 StartDay = (localtime(&Start)->tm_hour + 1) % 24; 588 FutureDay = (localtime(&Future)->tm_hour + 1) % 24; 589 return (Future - Start) + (StartDay - FutureDay) * 60L * 60L; 590 } 591 592 593 static time_t 594 RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber) 595 { 596 struct tm *tm; 597 time_t now; 598 599 now = Start; 600 tm = localtime(&now); 601 now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7); 602 now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1); 603 return DSTcorrect(Start, now); 604 } 605 606 607 static time_t 608 RelativeMonth(time_t Start, time_t RelMonth) 609 { 610 struct tm *tm; 611 time_t Month; 612 time_t Year; 613 614 if (RelMonth == 0) 615 return (0); 616 tm = localtime(&Start); 617 Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth; 618 Year = Month / 12; 619 Month = Month % 12 + 1; 620 return DSTcorrect(Start, 621 Convert(Month, (time_t)tm->tm_mday, Year, 622 (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec, 623 MER24, DSTmaybe)); 624 } 625 626 627 static int 628 lookup(char *buff) 629 { 630 size_t len; 631 char *p, *q; 632 int i, abbrev; 633 const TABLE *tp; 634 635 /* Make it lowercase. */ 636 for (p = buff; *p; p++) 637 if (isupper(*p)) 638 *p = tolower(*p); 639 640 if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) { 641 yylval.Meridian = MERam; 642 return (tMERIDIAN); 643 } 644 if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) { 645 yylval.Meridian = MERpm; 646 return (tMERIDIAN); 647 } 648 649 len = strlen(buff); 650 /* See if we have an abbreviation for a month. */ 651 if (len == 3) 652 abbrev = 1; 653 else if (len == 4 && buff[3] == '.') { 654 abbrev = 1; 655 buff[3] = '\0'; 656 --len; 657 } else 658 abbrev = 0; 659 660 for (tp = MonthDayTable; tp->name; tp++) { 661 if (abbrev) { 662 if (strncmp(buff, tp->name, 3) == 0) { 663 yylval.Number = tp->value; 664 return (tp->type); 665 } 666 } else if (strcmp(buff, tp->name) == 0) { 667 yylval.Number = tp->value; 668 return (tp->type); 669 } 670 } 671 672 for (tp = TimezoneTable; tp->name; tp++) 673 if (strcmp(buff, tp->name) == 0) { 674 yylval.Number = tp->value; 675 return (tp->type); 676 } 677 678 if (strcmp(buff, "dst") == 0) 679 return (tDST); 680 681 for (tp = UnitsTable; tp->name; tp++) 682 if (strcmp(buff, tp->name) == 0) { 683 yylval.Number = tp->value; 684 return (tp->type); 685 } 686 687 /* Strip off any plural and try the units table again. */ 688 if (len != 0 && buff[len - 1] == 's') { 689 buff[len - 1] = '\0'; 690 for (tp = UnitsTable; tp->name; tp++) 691 if (strcmp(buff, tp->name) == 0) { 692 yylval.Number = tp->value; 693 return (tp->type); 694 } 695 buff[len - 1] = 's'; /* Put back for "this" in OtherTable. */ 696 } 697 698 for (tp = OtherTable; tp->name; tp++) 699 if (strcmp(buff, tp->name) == 0) { 700 yylval.Number = tp->value; 701 return (tp->type); 702 } 703 704 /* Military timezones. */ 705 if (len == 1 && isalpha(*buff)) { 706 for (tp = MilitaryTable; tp->name; tp++) 707 if (strcmp(buff, tp->name) == 0) { 708 yylval.Number = tp->value; 709 return (tp->type); 710 } 711 } 712 713 /* Drop out any periods and try the timezone table again. */ 714 for (i = 0, p = q = buff; *q; q++) 715 if (*q != '.') 716 *p++ = *q; 717 else 718 i++; 719 *p = '\0'; 720 if (i) 721 for (tp = TimezoneTable; tp->name; tp++) 722 if (strcmp(buff, tp->name) == 0) { 723 yylval.Number = tp->value; 724 return (tp->type); 725 } 726 727 return (tID); 728 } 729 730 731 static int 732 yylex(void) 733 { 734 char c, *p, buff[20]; 735 int count, sign; 736 737 for (;;) { 738 while (isspace(*yyInput)) 739 yyInput++; 740 741 if (isdigit(c = *yyInput) || c == '-' || c == '+') { 742 if (c == '-' || c == '+') { 743 sign = c == '-' ? -1 : 1; 744 if (!isdigit(*++yyInput)) 745 /* skip the '-' sign */ 746 continue; 747 } 748 else 749 sign = 0; 750 751 for (yylval.Number = 0; isdigit(c = *yyInput++); ) 752 yylval.Number = 10 * yylval.Number + c - '0'; 753 yyInput--; 754 if (sign < 0) 755 yylval.Number = -yylval.Number; 756 return sign ? tSNUMBER : tUNUMBER; 757 } 758 759 if (isalpha(c)) { 760 for (p = buff; isalpha(c = *yyInput++) || c == '.'; ) 761 if (p < &buff[sizeof buff - 1]) 762 *p++ = c; 763 *p = '\0'; 764 yyInput--; 765 return lookup(buff); 766 } 767 if (c != '(') 768 return *yyInput++; 769 770 count = 0; 771 do { 772 c = *yyInput++; 773 if (c == '\0') 774 return (c); 775 if (c == '(') 776 count++; 777 else if (c == ')') 778 count--; 779 } while (count > 0); 780 } 781 } 782 783 /* Yield A - B, measured in seconds. */ 784 static long 785 difftm(struct tm *a, struct tm *b) 786 { 787 int ay = a->tm_year + (YEAR_TMORIGIN - 1); 788 int by = b->tm_year + (YEAR_TMORIGIN - 1); 789 int days = ( 790 /* difference in day of year */ 791 a->tm_yday - b->tm_yday 792 /* + intervening leap days */ 793 + ((ay >> 2) - (by >> 2)) 794 - (ay/100 - by/100) 795 + ((ay/100 >> 2) - (by/100 >> 2)) 796 /* + difference in years * 365 */ 797 + (long)(ay-by) * 365); 798 return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) 799 + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec)); 800 } 801 802 /* 803 * date_parse() 804 * 805 * Returns the number of seconds since the Epoch corresponding to the date. 806 */ 807 time_t 808 date_parse(const char *p) 809 { 810 struct tm gmt, tm; 811 time_t Start, tod, nowtime, tz; 812 813 yyInput = p; 814 815 if (time(&nowtime) == -1 || !gmtime_r(&nowtime, &gmt) || 816 !localtime_r(&nowtime, &tm)) 817 return -1; 818 819 tz = difftm(&gmt, &tm) / 60; 820 821 if (tm.tm_isdst) 822 tz += 60; 823 824 yyYear = tm.tm_year + 1900; 825 yyMonth = tm.tm_mon + 1; 826 yyDay = tm.tm_mday; 827 yyTimezone = tz; 828 yyDSTmode = DSTmaybe; 829 yyHour = 0; 830 yyMinutes = 0; 831 yySeconds = 0; 832 yyMeridian = MER24; 833 yyRelSeconds = 0; 834 yyRelMonth = 0; 835 yyHaveDate = 0; 836 yyHaveDay = 0; 837 yyHaveRel = 0; 838 yyHaveTime = 0; 839 yyHaveZone = 0; 840 841 if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 || 842 yyHaveDate > 1 || yyHaveDay > 1) 843 return (-1); 844 845 if (yyHaveDate || yyHaveTime || yyHaveDay) { 846 Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, 847 yySeconds, yyMeridian, yyDSTmode); 848 if (Start < 0) 849 return (-1); 850 } else { 851 Start = nowtime; 852 if (!yyHaveRel) 853 Start -= ((tm.tm_hour * 60L + tm.tm_min) * 60L) + 854 tm.tm_sec; 855 } 856 857 Start += yyRelSeconds; 858 Start += RelativeMonth(Start, yyRelMonth); 859 860 if (yyHaveDay && !yyHaveDate) { 861 tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber); 862 Start += tod; 863 } 864 865 return Start; 866 } 867 868 #if defined(TEST) 869 /* ARGSUSED */ 870 int 871 main(int argc, char **argv) 872 { 873 char buff[128]; 874 time_t d; 875 876 (void)printf("Enter date, or blank line to exit.\n\t> "); 877 (void)fflush(stdout); 878 while (fgets(buff, sizeof(buff), stdin) && buff[0]) { 879 d = date_parse(buff); 880 if (d == -1) 881 (void)printf("Bad format - couldn't convert.\n"); 882 else 883 (void)printf("%s", ctime(&d)); 884 (void)printf("\t> "); 885 (void)fflush(stdout); 886 } 887 888 return (0); 889 } 890 #endif /* defined(TEST) */ 891