1 %{ 2 /* $OpenBSD: date.y,v 1.18 2008/02/16 01:00:00 cnst 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 <string.h> 21 22 #include "cvs.h" 23 24 #define YEAR_EPOCH 1970 25 #define YEAR_TMORIGIN 1900 26 #define HOUR(x) ((time_t)(x) * 60) 27 #define SECSPERDAY (24L * 60L * 60L) 28 29 30 /* An entry in the lexical lookup table */ 31 typedef struct _TABLE { 32 char *name; 33 int type; 34 time_t value; 35 } TABLE; 36 37 38 /* Daylight-savings mode: on, off, or not yet known. */ 39 typedef enum _DSTMODE { 40 DSTon, DSToff, DSTmaybe 41 } DSTMODE; 42 43 /* Meridian: am, pm, or 24-hour style. */ 44 typedef enum _MERIDIAN { 45 MERam, MERpm, MER24 46 } MERIDIAN; 47 48 49 /* 50 * Global variables. We could get rid of most of these by using a good 51 * union as the yacc stack. (This routine was originally written before 52 * yacc had the %union construct.) Maybe someday; right now we only use 53 * the %union very rarely. 54 */ 55 static const char *yyInput; 56 static DSTMODE yyDSTmode; 57 static time_t yyDayOrdinal; 58 static time_t yyDayNumber; 59 static int yyHaveDate; 60 static int yyHaveDay; 61 static int yyHaveRel; 62 static int yyHaveTime; 63 static int yyHaveZone; 64 static time_t yyTimezone; 65 static time_t yyDay; 66 static time_t yyHour; 67 static time_t yyMinutes; 68 static time_t yyMonth; 69 static time_t yySeconds; 70 static time_t yyYear; 71 static MERIDIAN yyMeridian; 72 static time_t yyRelMonth; 73 static time_t yyRelSeconds; 74 75 76 static int yyerror(const char *); 77 static int yylex(void); 78 static int yyparse(void); 79 static int lookup(char *); 80 81 %} 82 83 %union { 84 time_t Number; 85 enum _MERIDIAN Meridian; 86 } 87 88 %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT 89 %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST 90 91 %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT 92 %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE 93 %type <Meridian> tMERIDIAN o_merid 94 95 %% 96 97 spec : /* NULL */ 98 | spec item 99 ; 100 101 item : time { 102 yyHaveTime++; 103 } 104 | zone { 105 yyHaveZone++; 106 } 107 | date { 108 yyHaveDate++; 109 } 110 | day { 111 yyHaveDay++; 112 } 113 | rel { 114 yyHaveRel++; 115 } 116 | number 117 ; 118 119 time : tUNUMBER tMERIDIAN { 120 yyHour = $1; 121 yyMinutes = 0; 122 yySeconds = 0; 123 yyMeridian = $2; 124 } 125 | tUNUMBER ':' tUNUMBER o_merid { 126 yyHour = $1; 127 yyMinutes = $3; 128 yySeconds = 0; 129 yyMeridian = $4; 130 } 131 | tUNUMBER ':' tUNUMBER tSNUMBER { 132 yyHour = $1; 133 yyMinutes = $3; 134 yyMeridian = MER24; 135 yyDSTmode = DSToff; 136 yyTimezone = - ($4 % 100 + ($4 / 100) * 60); 137 } 138 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { 139 yyHour = $1; 140 yyMinutes = $3; 141 yySeconds = $5; 142 yyMeridian = $6; 143 } 144 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { 145 yyHour = $1; 146 yyMinutes = $3; 147 yySeconds = $5; 148 yyMeridian = MER24; 149 yyDSTmode = DSToff; 150 yyTimezone = - ($6 % 100 + ($6 / 100) * 60); 151 } 152 ; 153 154 zone : tZONE { 155 yyTimezone = $1; 156 yyDSTmode = DSToff; 157 } 158 | tDAYZONE { 159 yyTimezone = $1; 160 yyDSTmode = DSTon; 161 } 162 | tZONE tDST { 163 yyTimezone = $1; 164 yyDSTmode = DSTon; 165 } 166 ; 167 168 day : tDAY { 169 yyDayOrdinal = 1; 170 yyDayNumber = $1; 171 } 172 | tDAY ',' { 173 yyDayOrdinal = 1; 174 yyDayNumber = $1; 175 } 176 | tUNUMBER tDAY { 177 yyDayOrdinal = $1; 178 yyDayNumber = $2; 179 } 180 ; 181 182 date : tUNUMBER '/' tUNUMBER { 183 yyMonth = $1; 184 yyDay = $3; 185 } 186 | tUNUMBER '/' tUNUMBER '/' tUNUMBER { 187 if ($1 >= 100) { 188 yyYear = $1; 189 yyMonth = $3; 190 yyDay = $5; 191 } else { 192 yyMonth = $1; 193 yyDay = $3; 194 yyYear = $5; 195 } 196 } 197 | tUNUMBER tSNUMBER tSNUMBER { 198 /* ISO 8601 format. yyyy-mm-dd. */ 199 yyYear = $1; 200 yyMonth = -$2; 201 yyDay = -$3; 202 } 203 | tUNUMBER tMONTH tSNUMBER { 204 /* e.g. 17-JUN-1992. */ 205 yyDay = $1; 206 yyMonth = $2; 207 yyYear = -$3; 208 } 209 | tMONTH tUNUMBER { 210 yyMonth = $1; 211 yyDay = $2; 212 } 213 | tMONTH tUNUMBER ',' tUNUMBER { 214 yyMonth = $1; 215 yyDay = $2; 216 yyYear = $4; 217 } 218 | tUNUMBER tMONTH { 219 yyMonth = $2; 220 yyDay = $1; 221 } 222 | tUNUMBER tMONTH tUNUMBER { 223 yyMonth = $2; 224 yyDay = $1; 225 yyYear = $3; 226 } 227 ; 228 229 rel : relunit tAGO { 230 yyRelSeconds = -yyRelSeconds; 231 yyRelMonth = -yyRelMonth; 232 } 233 | relunit 234 ; 235 236 relunit : tUNUMBER tMINUTE_UNIT { 237 yyRelSeconds += $1 * $2 * 60L; 238 } 239 | tSNUMBER tMINUTE_UNIT { 240 yyRelSeconds += $1 * $2 * 60L; 241 } 242 | tMINUTE_UNIT { 243 yyRelSeconds += $1 * 60L; 244 } 245 | tSNUMBER tSEC_UNIT { 246 yyRelSeconds += $1; 247 } 248 | tUNUMBER tSEC_UNIT { 249 yyRelSeconds += $1; 250 } 251 | tSEC_UNIT { 252 yyRelSeconds++; 253 } 254 | tSNUMBER tMONTH_UNIT { 255 yyRelMonth += $1 * $2; 256 } 257 | tUNUMBER tMONTH_UNIT { 258 yyRelMonth += $1 * $2; 259 } 260 | tMONTH_UNIT { 261 yyRelMonth += $1; 262 } 263 ; 264 265 number : tUNUMBER { 266 if (yyHaveTime && yyHaveDate && !yyHaveRel) 267 yyYear = $1; 268 else { 269 if ($1 > 10000) { 270 yyHaveDate++; 271 yyDay= ($1)%100; 272 yyMonth= ($1/100)%100; 273 yyYear = $1/10000; 274 } else { 275 yyHaveTime++; 276 if ($1 < 100) { 277 yyHour = $1; 278 yyMinutes = 0; 279 } else { 280 yyHour = $1 / 100; 281 yyMinutes = $1 % 100; 282 } 283 yySeconds = 0; 284 yyMeridian = MER24; 285 } 286 } 287 } 288 ; 289 290 o_merid : /* NULL */ { 291 $$ = MER24; 292 } 293 | tMERIDIAN { 294 $$ = $1; 295 } 296 ; 297 298 %% 299 300 /* Month and day table. */ 301 static TABLE const MonthDayTable[] = { 302 { "january", tMONTH, 1 }, 303 { "february", tMONTH, 2 }, 304 { "march", tMONTH, 3 }, 305 { "april", tMONTH, 4 }, 306 { "may", tMONTH, 5 }, 307 { "june", tMONTH, 6 }, 308 { "july", tMONTH, 7 }, 309 { "august", tMONTH, 8 }, 310 { "september", tMONTH, 9 }, 311 { "sept", tMONTH, 9 }, 312 { "october", tMONTH, 10 }, 313 { "november", tMONTH, 11 }, 314 { "december", tMONTH, 12 }, 315 { "sunday", tDAY, 0 }, 316 { "monday", tDAY, 1 }, 317 { "tuesday", tDAY, 2 }, 318 { "tues", tDAY, 2 }, 319 { "wednesday", tDAY, 3 }, 320 { "wednes", tDAY, 3 }, 321 { "thursday", tDAY, 4 }, 322 { "thur", tDAY, 4 }, 323 { "thurs", tDAY, 4 }, 324 { "friday", tDAY, 5 }, 325 { "saturday", tDAY, 6 }, 326 { NULL } 327 }; 328 329 /* Time units table. */ 330 static TABLE const UnitsTable[] = { 331 { "year", tMONTH_UNIT, 12 }, 332 { "month", tMONTH_UNIT, 1 }, 333 { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, 334 { "week", tMINUTE_UNIT, 7 * 24 * 60 }, 335 { "day", tMINUTE_UNIT, 1 * 24 * 60 }, 336 { "hour", tMINUTE_UNIT, 60 }, 337 { "minute", tMINUTE_UNIT, 1 }, 338 { "min", tMINUTE_UNIT, 1 }, 339 { "second", tSEC_UNIT, 1 }, 340 { "sec", tSEC_UNIT, 1 }, 341 { NULL } 342 }; 343 344 /* Assorted relative-time words. */ 345 static TABLE const OtherTable[] = { 346 { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, 347 { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, 348 { "today", tMINUTE_UNIT, 0 }, 349 { "now", tMINUTE_UNIT, 0 }, 350 { "last", tUNUMBER, -1 }, 351 { "this", tMINUTE_UNIT, 0 }, 352 { "next", tUNUMBER, 2 }, 353 { "first", tUNUMBER, 1 }, 354 /* { "second", tUNUMBER, 2 }, */ 355 { "third", tUNUMBER, 3 }, 356 { "fourth", tUNUMBER, 4 }, 357 { "fifth", tUNUMBER, 5 }, 358 { "sixth", tUNUMBER, 6 }, 359 { "seventh", tUNUMBER, 7 }, 360 { "eighth", tUNUMBER, 8 }, 361 { "ninth", tUNUMBER, 9 }, 362 { "tenth", tUNUMBER, 10 }, 363 { "eleventh", tUNUMBER, 11 }, 364 { "twelfth", tUNUMBER, 12 }, 365 { "ago", tAGO, 1 }, 366 { NULL } 367 }; 368 369 /* The timezone table. */ 370 /* Some of these are commented out because a time_t can't store a float. */ 371 static TABLE const TimezoneTable[] = { 372 { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ 373 { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */ 374 { "utc", tZONE, HOUR( 0) }, 375 { "wet", tZONE, HOUR( 0) }, /* Western European */ 376 { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ 377 { "wat", tZONE, HOUR( 1) }, /* West Africa */ 378 { "at", tZONE, HOUR( 2) }, /* Azores */ 379 #if 0 380 /* For completeness. BST is also British Summer, and GST is 381 * also Guam Standard. */ 382 { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ 383 { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ 384 #endif 385 #if 0 386 { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */ 387 { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */ 388 { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */ 389 #endif 390 { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ 391 { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ 392 { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ 393 { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ 394 { "cst", tZONE, HOUR( 6) }, /* Central Standard */ 395 { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ 396 { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ 397 { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ 398 { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ 399 { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ 400 { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ 401 { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ 402 { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ 403 { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */ 404 { "cat", tZONE, HOUR(10) }, /* Central Alaska */ 405 { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */ 406 { "nt", tZONE, HOUR(11) }, /* Nome */ 407 { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ 408 { "cet", tZONE, -HOUR(1) }, /* Central European */ 409 { "met", tZONE, -HOUR(1) }, /* Middle European */ 410 { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ 411 { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ 412 { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */ 413 { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */ 414 { "fwt", tZONE, -HOUR(1) }, /* French Winter */ 415 { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */ 416 { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */ 417 { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */ 418 #if 0 419 { "it", tZONE, -HOUR(3.5) },/* Iran */ 420 #endif 421 { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */ 422 { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */ 423 #if 0 424 { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */ 425 #endif 426 { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */ 427 #if 0 428 /* For completeness. NST is also Newfoundland Stanard, and SST is 429 * also Swedish Summer. */ 430 { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */ 431 { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */ 432 #endif /* 0 */ 433 { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */ 434 { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */ 435 #if 0 436 { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */ 437 #endif 438 { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */ 439 { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */ 440 #if 0 441 { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */ 442 { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */ 443 #endif 444 { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ 445 { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ 446 { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */ 447 { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ 448 { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ 449 { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ 450 { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ 451 { NULL } 452 }; 453 454 /* Military timezone table. */ 455 static TABLE const MilitaryTable[] = { 456 { "a", tZONE, HOUR( 1) }, 457 { "b", tZONE, HOUR( 2) }, 458 { "c", tZONE, HOUR( 3) }, 459 { "d", tZONE, HOUR( 4) }, 460 { "e", tZONE, HOUR( 5) }, 461 { "f", tZONE, HOUR( 6) }, 462 { "g", tZONE, HOUR( 7) }, 463 { "h", tZONE, HOUR( 8) }, 464 { "i", tZONE, HOUR( 9) }, 465 { "k", tZONE, HOUR( 10) }, 466 { "l", tZONE, HOUR( 11) }, 467 { "m", tZONE, HOUR( 12) }, 468 { "n", tZONE, HOUR(- 1) }, 469 { "o", tZONE, HOUR(- 2) }, 470 { "p", tZONE, HOUR(- 3) }, 471 { "q", tZONE, HOUR(- 4) }, 472 { "r", tZONE, HOUR(- 5) }, 473 { "s", tZONE, HOUR(- 6) }, 474 { "t", tZONE, HOUR(- 7) }, 475 { "u", tZONE, HOUR(- 8) }, 476 { "v", tZONE, HOUR(- 9) }, 477 { "w", tZONE, HOUR(-10) }, 478 { "x", tZONE, HOUR(-11) }, 479 { "y", tZONE, HOUR(-12) }, 480 { "z", tZONE, HOUR( 0) }, 481 { NULL } 482 }; 483 484 485 static int 486 yyerror(const char *s) 487 { 488 #if !defined(TEST) 489 char *str; 490 491 (void)xasprintf(&str, "parsing date string: %s", s); 492 cvs_log(LP_ERR, "%s", str); 493 xfree(str); 494 #endif 495 return (0); 496 } 497 498 499 static time_t 500 ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian) 501 { 502 if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) 503 return (-1); 504 505 switch (Meridian) { 506 case MER24: 507 if (Hours < 0 || Hours > 23) 508 return (-1); 509 return (Hours * 60L + Minutes) * 60L + Seconds; 510 case MERam: 511 if (Hours < 1 || Hours > 12) 512 return (-1); 513 if (Hours == 12) 514 Hours = 0; 515 return (Hours * 60L + Minutes) * 60L + Seconds; 516 case MERpm: 517 if (Hours < 1 || Hours > 12) 518 return (-1); 519 if (Hours == 12) 520 Hours = 0; 521 return ((Hours + 12) * 60L + Minutes) * 60L + Seconds; 522 default: 523 return (-1); 524 } 525 /* NOTREACHED */ 526 } 527 528 529 /* Year is either 530 * A negative number, which means to use its absolute value (why?) 531 * A number from 0 to 99, which means a year from 1900 to 1999, or 532 * The actual year (>=100). 533 */ 534 static time_t 535 Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes, 536 time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode) 537 { 538 static int DaysInMonth[12] = { 539 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 540 }; 541 time_t tod; 542 time_t julian; 543 int i; 544 545 if (Year < 0) 546 Year = -Year; 547 if (Year < 69) 548 Year += 2000; 549 else if (Year < 100) { 550 Year += 1900; 551 if (Year < YEAR_EPOCH) 552 Year += 100; 553 } 554 DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) 555 ? 29 : 28; 556 /* Checking for 2038 bogusly assumes that time_t is 32 bits. But 557 I'm too lazy to try to check for time_t overflow in another way. */ 558 if (Year < YEAR_EPOCH || Year > 2038 || 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 * cvs_date_parse() 804 * 805 * Returns the number of seconds since the Epoch corresponding to the date. 806 */ 807 time_t 808 cvs_date_parse(const char *p) 809 { 810 struct tm gmt, *gmt_ptr, *tm; 811 struct timeb ftz, *now; 812 time_t Start, tod, nowtime; 813 814 yyInput = p; 815 816 now = &ftz; 817 (void)time(&nowtime); 818 819 gmt_ptr = gmtime(&nowtime); 820 if (gmt_ptr != NULL) { 821 /* Make a copy, in case localtime modifies *tm (I think 822 * that comment now applies to *gmt_ptr, but I am too 823 * lazy to dig into how gmtime and locatime allocate the 824 * structures they return pointers to). 825 */ 826 gmt = *gmt_ptr; 827 } 828 829 if (!(tm = localtime(&nowtime))) 830 return (-1); 831 832 if (gmt_ptr != NULL) 833 ftz.timezone = difftm(&gmt, tm) / 60; 834 835 if (tm->tm_isdst) 836 ftz.timezone += 60; 837 838 tm = localtime(&nowtime); 839 yyYear = tm->tm_year + 1900; 840 yyMonth = tm->tm_mon + 1; 841 yyDay = tm->tm_mday; 842 yyTimezone = now->timezone; 843 yyDSTmode = DSTmaybe; 844 yyHour = 0; 845 yyMinutes = 0; 846 yySeconds = 0; 847 yyMeridian = MER24; 848 yyRelSeconds = 0; 849 yyRelMonth = 0; 850 yyHaveDate = 0; 851 yyHaveDay = 0; 852 yyHaveRel = 0; 853 yyHaveTime = 0; 854 yyHaveZone = 0; 855 856 if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 || 857 yyHaveDate > 1 || yyHaveDay > 1) 858 return (-1); 859 860 if (yyHaveDate || yyHaveTime || yyHaveDay) { 861 Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, 862 yySeconds, yyMeridian, yyDSTmode); 863 if (Start < 0) 864 return (-1); 865 } else { 866 Start = nowtime; 867 if (!yyHaveRel) 868 Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + 869 tm->tm_sec; 870 } 871 872 Start += yyRelSeconds; 873 Start += RelativeMonth(Start, yyRelMonth); 874 875 if (yyHaveDay && !yyHaveDate) { 876 tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber); 877 Start += tod; 878 } 879 880 /* Have to do *something* with a legitimate -1 so it's distinguishable 881 * from the error return value. (Alternately could set errno on error.) 882 */ 883 return (Start == -1) ? (0) : (Start); 884 } 885 886 #if defined(TEST) 887 /* ARGSUSED */ 888 int 889 main(int argc, char **argv) 890 { 891 char buff[128]; 892 time_t d; 893 894 (void)printf("Enter date, or blank line to exit.\n\t> "); 895 (void)fflush(stdout); 896 while (fgets(buff, sizeof(buff), stdin) && buff[0]) { 897 d = cvs_date_parse(buff); 898 if (d == -1) 899 (void)printf("Bad format - couldn't convert.\n"); 900 else 901 (void)printf("%s", ctime(&d)); 902 (void)printf("\t> "); 903 (void)fflush(stdout); 904 } 905 906 return (0); 907 } 908 #endif /* defined(TEST) */ 909