1 %{ 2 /* 3 ** Originally written by Steven M. Bellovin <smb@research.att.com> while 4 ** at the University of North Carolina at Chapel Hill. Later tweaked by 5 ** a couple of people on Usenet. Completely overhauled by Rich $alz 6 ** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990; 7 ** 8 ** This grammar has 10 shift/reduce conflicts. 9 ** 10 ** This code is in the public domain and has no copyright. 11 ** 12 ** Picked up from CVS and slightly cleaned up by to WARNS=5 level by 13 ** Poul-Henning Kamp <phk@FreeBSD.org> 14 ** 15 ** $FreeBSD$ 16 */ 17 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <ctype.h> 21 #include <string.h> 22 #include <sys/types.h> 23 #include <sys/time.h> 24 25 #include "libfifolog.h" 26 27 #define yylex getdate_yylex 28 #define yyerror getdate_yyerror 29 30 static int yylex(void); 31 static int yyerror(const char *); 32 33 #define EPOCH 1970 34 #define HOUR(x) ((time_t)(x) * 60) 35 #define SECSPERDAY (24L * 60L * 60L) 36 37 38 /* 39 ** An entry in the lexical lookup table. 40 */ 41 typedef struct _TABLE { 42 const char *name; 43 int type; 44 time_t value; 45 } TABLE; 46 47 48 /* 49 ** Daylight-savings mode: on, off, or not yet known. 50 */ 51 typedef enum _DSTMODE { 52 DSToff, DSTon, DSTmaybe 53 } DSTMODE; 54 55 /* 56 ** Meridian: am, pm, or 24-hour style. 57 */ 58 typedef enum _MERIDIAN { 59 MERam, MERpm, MER24 60 } MERIDIAN; 61 62 63 /* 64 ** Global variables. We could get rid of most of these by using a good 65 ** union as the yacc stack. (This routine was originally written before 66 ** yacc had the %union construct.) Maybe someday; right now we only use 67 ** the %union very rarely. 68 */ 69 static char *yyInput; 70 static DSTMODE yyDSTmode; 71 static time_t yyDayOrdinal; 72 static time_t yyDayNumber; 73 static int yyHaveDate; 74 static int yyHaveDay; 75 static int yyHaveRel; 76 static int yyHaveTime; 77 static int yyHaveZone; 78 static time_t yyTimezone; 79 static time_t yyDay; 80 static time_t yyHour; 81 static time_t yyMinutes; 82 static time_t yyMonth; 83 static time_t yySeconds; 84 static time_t yyYear; 85 static MERIDIAN yyMeridian; 86 static time_t yyRelMonth; 87 static time_t yyRelSeconds; 88 89 %} 90 91 %union { 92 time_t Number; 93 enum _MERIDIAN Meridian; 94 } 95 96 %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT 97 %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST 98 99 %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT 100 %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE 101 %type <Meridian> tMERIDIAN o_merid 102 103 %% 104 105 spec : /* NULL */ 106 | spec item 107 ; 108 109 item : time { 110 yyHaveTime++; 111 } 112 | zone { 113 yyHaveZone++; 114 } 115 | date { 116 yyHaveDate++; 117 } 118 | day { 119 yyHaveDay++; 120 } 121 | rel { 122 yyHaveRel++; 123 } 124 | cvsstamp { 125 yyHaveTime++; 126 yyHaveDate++; 127 yyHaveZone++; 128 } 129 | number 130 ; 131 132 cvsstamp: tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER { 133 yyYear = $1; 134 if (yyYear < 100) yyYear += 1900; 135 yyMonth = $3; 136 yyDay = $5; 137 yyHour = $7; 138 yyMinutes = $9; 139 yySeconds = $11; 140 yyDSTmode = DSToff; 141 yyTimezone = 0; 142 } 143 ; 144 145 time : tUNUMBER tMERIDIAN { 146 yyHour = $1; 147 yyMinutes = 0; 148 yySeconds = 0; 149 yyMeridian = $2; 150 } 151 | tUNUMBER ':' tUNUMBER o_merid { 152 yyHour = $1; 153 yyMinutes = $3; 154 yySeconds = 0; 155 yyMeridian = $4; 156 } 157 | tUNUMBER ':' tUNUMBER tSNUMBER { 158 yyHour = $1; 159 yyMinutes = $3; 160 yyMeridian = MER24; 161 yyDSTmode = DSToff; 162 yyTimezone = - ($4 % 100 + ($4 / 100) * 60); 163 } 164 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { 165 yyHour = $1; 166 yyMinutes = $3; 167 yySeconds = $5; 168 yyMeridian = $6; 169 } 170 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { 171 yyHour = $1; 172 yyMinutes = $3; 173 yySeconds = $5; 174 yyMeridian = MER24; 175 yyDSTmode = DSToff; 176 yyTimezone = - ($6 % 100 + ($6 / 100) * 60); 177 } 178 ; 179 180 zone : tZONE { 181 yyTimezone = $1; 182 yyDSTmode = DSToff; 183 } 184 | tDAYZONE { 185 yyTimezone = $1; 186 yyDSTmode = DSTon; 187 } 188 | 189 tZONE tDST { 190 yyTimezone = $1; 191 yyDSTmode = DSTon; 192 } 193 ; 194 195 day : tDAY { 196 yyDayOrdinal = 1; 197 yyDayNumber = $1; 198 } 199 | tDAY ',' { 200 yyDayOrdinal = 1; 201 yyDayNumber = $1; 202 } 203 | tUNUMBER tDAY { 204 yyDayOrdinal = $1; 205 yyDayNumber = $2; 206 } 207 ; 208 209 date : tUNUMBER '/' tUNUMBER { 210 yyMonth = $1; 211 yyDay = $3; 212 } 213 | tUNUMBER '/' tUNUMBER '/' tUNUMBER { 214 if ($1 >= 100) { 215 yyYear = $1; 216 yyMonth = $3; 217 yyDay = $5; 218 } else { 219 yyMonth = $1; 220 yyDay = $3; 221 yyYear = $5; 222 } 223 } 224 | tUNUMBER tSNUMBER tSNUMBER { 225 /* ISO 8601 format. yyyy-mm-dd. */ 226 yyYear = $1; 227 yyMonth = -$2; 228 yyDay = -$3; 229 } 230 | tUNUMBER tMONTH tSNUMBER { 231 /* e.g. 17-JUN-1992. */ 232 yyDay = $1; 233 yyMonth = $2; 234 yyYear = -$3; 235 } 236 | tMONTH tUNUMBER { 237 yyMonth = $1; 238 yyDay = $2; 239 } 240 | tMONTH tUNUMBER ',' tUNUMBER { 241 yyMonth = $1; 242 yyDay = $2; 243 yyYear = $4; 244 } 245 | tUNUMBER tMONTH { 246 yyMonth = $2; 247 yyDay = $1; 248 } 249 | tUNUMBER tMONTH tUNUMBER { 250 yyMonth = $2; 251 yyDay = $1; 252 yyYear = $3; 253 } 254 ; 255 256 rel : relunit tAGO { 257 yyRelSeconds = -yyRelSeconds; 258 yyRelMonth = -yyRelMonth; 259 } 260 | relunit 261 ; 262 263 relunit : tUNUMBER tMINUTE_UNIT { 264 yyRelSeconds += $1 * $2 * 60L; 265 } 266 | tSNUMBER tMINUTE_UNIT { 267 yyRelSeconds += $1 * $2 * 60L; 268 } 269 | tMINUTE_UNIT { 270 yyRelSeconds += $1 * 60L; 271 } 272 | tSNUMBER tSEC_UNIT { 273 yyRelSeconds += $1; 274 } 275 | tUNUMBER tSEC_UNIT { 276 yyRelSeconds += $1; 277 } 278 | tSEC_UNIT { 279 yyRelSeconds++; 280 } 281 | tSNUMBER tMONTH_UNIT { 282 yyRelMonth += $1 * $2; 283 } 284 | tUNUMBER tMONTH_UNIT { 285 yyRelMonth += $1 * $2; 286 } 287 | tMONTH_UNIT { 288 yyRelMonth += $1; 289 } 290 ; 291 292 number : tUNUMBER { 293 if (yyHaveTime && yyHaveDate && !yyHaveRel) 294 yyYear = $1; 295 else { 296 if($1>10000) { 297 yyHaveDate++; 298 yyDay= ($1)%100; 299 yyMonth= ($1/100)%100; 300 yyYear = $1/10000; 301 } 302 else { 303 yyHaveTime++; 304 if ($1 < 100) { 305 yyHour = $1; 306 yyMinutes = 0; 307 } 308 else { 309 yyHour = $1 / 100; 310 yyMinutes = $1 % 100; 311 } 312 yySeconds = 0; 313 yyMeridian = MER24; 314 } 315 } 316 } 317 ; 318 319 o_merid : /* NULL */ { 320 $$ = MER24; 321 } 322 | tMERIDIAN { 323 $$ = $1; 324 } 325 ; 326 327 %% 328 329 /* Month and day table. */ 330 static TABLE const MonthDayTable[] = { 331 { "january", tMONTH, 1 }, 332 { "february", tMONTH, 2 }, 333 { "march", tMONTH, 3 }, 334 { "april", tMONTH, 4 }, 335 { "may", tMONTH, 5 }, 336 { "june", tMONTH, 6 }, 337 { "july", tMONTH, 7 }, 338 { "august", tMONTH, 8 }, 339 { "september", tMONTH, 9 }, 340 { "sept", tMONTH, 9 }, 341 { "october", tMONTH, 10 }, 342 { "november", tMONTH, 11 }, 343 { "december", tMONTH, 12 }, 344 { "sunday", tDAY, 0 }, 345 { "monday", tDAY, 1 }, 346 { "tuesday", tDAY, 2 }, 347 { "tues", tDAY, 2 }, 348 { "wednesday", tDAY, 3 }, 349 { "wednes", tDAY, 3 }, 350 { "thursday", tDAY, 4 }, 351 { "thur", tDAY, 4 }, 352 { "thurs", tDAY, 4 }, 353 { "friday", tDAY, 5 }, 354 { "saturday", tDAY, 6 }, 355 { NULL, 0, 0 } 356 }; 357 358 /* Time units table. */ 359 static TABLE const UnitsTable[] = { 360 { "year", tMONTH_UNIT, 12 }, 361 { "month", tMONTH_UNIT, 1 }, 362 { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, 363 { "week", tMINUTE_UNIT, 7 * 24 * 60 }, 364 { "day", tMINUTE_UNIT, 1 * 24 * 60 }, 365 { "hour", tMINUTE_UNIT, 60 }, 366 { "minute", tMINUTE_UNIT, 1 }, 367 { "min", tMINUTE_UNIT, 1 }, 368 { "second", tSEC_UNIT, 1 }, 369 { "sec", tSEC_UNIT, 1 }, 370 { NULL, 0, 0 } 371 }; 372 373 /* Assorted relative-time words. */ 374 static TABLE const OtherTable[] = { 375 { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, 376 { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, 377 { "today", tMINUTE_UNIT, 0 }, 378 { "now", tMINUTE_UNIT, 0 }, 379 { "last", tUNUMBER, -1 }, 380 { "this", tMINUTE_UNIT, 0 }, 381 { "next", tUNUMBER, 2 }, 382 { "first", tUNUMBER, 1 }, 383 /* { "second", tUNUMBER, 2 }, */ 384 { "third", tUNUMBER, 3 }, 385 { "fourth", tUNUMBER, 4 }, 386 { "fifth", tUNUMBER, 5 }, 387 { "sixth", tUNUMBER, 6 }, 388 { "seventh", tUNUMBER, 7 }, 389 { "eighth", tUNUMBER, 8 }, 390 { "ninth", tUNUMBER, 9 }, 391 { "tenth", tUNUMBER, 10 }, 392 { "eleventh", tUNUMBER, 11 }, 393 { "twelfth", tUNUMBER, 12 }, 394 { "ago", tAGO, 1 }, 395 { NULL, 0, 0 } 396 }; 397 398 /* The timezone table. */ 399 /* Some of these are commented out because a time_t can't store a float. */ 400 static TABLE const TimezoneTable[] = { 401 { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ 402 { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */ 403 { "utc", tZONE, HOUR( 0) }, 404 { "wet", tZONE, HOUR( 0) }, /* Western European */ 405 { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ 406 { "wat", tZONE, HOUR( 1) }, /* West Africa */ 407 { "at", tZONE, HOUR( 2) }, /* Azores */ 408 #if 0 409 /* For completeness. BST is also British Summer, and GST is 410 * also Guam Standard. */ 411 { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ 412 { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ 413 #endif 414 #if 0 415 { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */ 416 { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */ 417 { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */ 418 #endif 419 { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ 420 { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ 421 { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ 422 { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ 423 { "cst", tZONE, HOUR( 6) }, /* Central Standard */ 424 { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ 425 { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ 426 { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ 427 { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ 428 { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ 429 { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ 430 { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ 431 { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ 432 { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */ 433 { "cat", tZONE, HOUR(10) }, /* Central Alaska */ 434 { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */ 435 { "nt", tZONE, HOUR(11) }, /* Nome */ 436 { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ 437 { "cet", tZONE, -HOUR(1) }, /* Central European */ 438 { "met", tZONE, -HOUR(1) }, /* Middle European */ 439 { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ 440 { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ 441 { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */ 442 { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */ 443 { "fwt", tZONE, -HOUR(1) }, /* French Winter */ 444 { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */ 445 { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */ 446 { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */ 447 #if 0 448 { "it", tZONE, -HOUR(3.5) },/* Iran */ 449 #endif 450 { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */ 451 { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */ 452 #if 0 453 { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */ 454 #endif 455 { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */ 456 #if 0 457 /* For completeness. NST is also Newfoundland Stanard, and SST is 458 * also Swedish Summer. */ 459 { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */ 460 { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */ 461 #endif /* 0 */ 462 { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */ 463 { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */ 464 #if 0 465 { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */ 466 #endif 467 { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */ 468 { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */ 469 #if 0 470 { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */ 471 { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */ 472 #endif 473 { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ 474 { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ 475 { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */ 476 { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ 477 { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ 478 { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ 479 { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ 480 { NULL, 0, 0 } 481 }; 482 483 /* Military timezone table. */ 484 static TABLE const MilitaryTable[] = { 485 { "a", tZONE, HOUR( 1) }, 486 { "b", tZONE, HOUR( 2) }, 487 { "c", tZONE, HOUR( 3) }, 488 { "d", tZONE, HOUR( 4) }, 489 { "e", tZONE, HOUR( 5) }, 490 { "f", tZONE, HOUR( 6) }, 491 { "g", tZONE, HOUR( 7) }, 492 { "h", tZONE, HOUR( 8) }, 493 { "i", tZONE, HOUR( 9) }, 494 { "k", tZONE, HOUR( 10) }, 495 { "l", tZONE, HOUR( 11) }, 496 { "m", tZONE, HOUR( 12) }, 497 { "n", tZONE, HOUR(- 1) }, 498 { "o", tZONE, HOUR(- 2) }, 499 { "p", tZONE, HOUR(- 3) }, 500 { "q", tZONE, HOUR(- 4) }, 501 { "r", tZONE, HOUR(- 5) }, 502 { "s", tZONE, HOUR(- 6) }, 503 { "t", tZONE, HOUR(- 7) }, 504 { "u", tZONE, HOUR(- 8) }, 505 { "v", tZONE, HOUR(- 9) }, 506 { "w", tZONE, HOUR(-10) }, 507 { "x", tZONE, HOUR(-11) }, 508 { "y", tZONE, HOUR(-12) }, 509 { "z", tZONE, HOUR( 0) }, 510 { NULL, 0, 0 } 511 }; 512 513 514 515 516 /* ARGSUSED */ 517 static int 518 yyerror(const char *s __unused) 519 { 520 return 0; 521 } 522 523 524 static time_t 525 ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian) 526 { 527 if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) 528 return -1; 529 switch (Meridian) { 530 case MER24: 531 if (Hours < 0 || Hours > 23) 532 return -1; 533 return (Hours * 60L + Minutes) * 60L + Seconds; 534 case MERam: 535 if (Hours < 1 || Hours > 12) 536 return -1; 537 if (Hours == 12) 538 Hours = 0; 539 return (Hours * 60L + Minutes) * 60L + Seconds; 540 case MERpm: 541 if (Hours < 1 || Hours > 12) 542 return -1; 543 if (Hours == 12) 544 Hours = 0; 545 return ((Hours + 12) * 60L + Minutes) * 60L + Seconds; 546 default: 547 abort (); 548 } 549 /* NOTREACHED */ 550 } 551 552 553 /* Year is either 554 * A negative number, which means to use its absolute value (why?) 555 * A number from 0 to 99, which means a year from 1900 to 1999, or 556 * The actual year (>=100). */ 557 static time_t 558 Convert(time_t Month, time_t Day, time_t Year, 559 time_t Hours, time_t Minutes, time_t Seconds, 560 MERIDIAN Meridian, DSTMODE DSTmode) 561 { 562 static int DaysInMonth[12] = { 563 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 564 }; 565 time_t tod; 566 time_t Julian; 567 int i; 568 struct tm *ltm; 569 570 if (Year < 0) 571 Year = -Year; 572 if (Year < 69) 573 Year += 2000; 574 else if (Year < 100) 575 Year += 1900; 576 DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) 577 ? 29 : 28; 578 /* Checking for 2038 bogusly assumes that time_t is 32 bits. But 579 I'm too lazy to try to check for time_t overflow in another way. */ 580 if (Year < EPOCH || Year > 2038 581 || Month < 1 || Month > 12 582 /* Lint fluff: "conversion from long may lose accuracy" */ 583 || Day < 1 || Day > DaysInMonth[(int)--Month]) 584 /* FIXME: 585 * It would be nice to set a global error string here. 586 * "February 30 is not a valid date" is much more informative than 587 * "Can't parse date/time: 100 months" when the user input was 588 * "100 months" and addition resolved that to February 30, for 589 * example. See rcs2-7 in src/sanity.sh for more. */ 590 return -1; 591 592 for (Julian = Day - 1, i = 0; i < Month; i++) 593 Julian += DaysInMonth[i]; 594 for (i = EPOCH; i < Year; i++) 595 Julian += 365 + (i % 4 == 0); 596 Julian *= SECSPERDAY; 597 Julian += yyTimezone * 60L; 598 if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0) 599 return -1; 600 Julian += tod; 601 ltm = localtime(&Julian); 602 fprintf(stderr, "DST %d TZ %s %d\n", DSTmode, ltm->tm_zone, ltm->tm_isdst); 603 if (DSTmode == DSTon 604 || (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst)) 605 Julian -= 60 * 60; 606 return Julian; 607 } 608 609 610 static time_t 611 DSTcorrect(time_t Start, time_t Future) 612 { 613 time_t StartDay; 614 time_t FutureDay; 615 616 StartDay = (localtime(&Start)->tm_hour + 1) % 24; 617 FutureDay = (localtime(&Future)->tm_hour + 1) % 24; 618 return (Future - Start) + (StartDay - FutureDay) * 60L * 60L; 619 } 620 621 622 static time_t 623 RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber) 624 { 625 struct tm *tm; 626 time_t now; 627 628 now = Start; 629 tm = localtime(&now); 630 now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7); 631 now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1); 632 return DSTcorrect(Start, now); 633 } 634 635 636 static time_t 637 RelativeMonth(time_t Start, time_t RelMonth) 638 { 639 struct tm *tm; 640 time_t Month; 641 time_t Year; 642 643 if (RelMonth == 0) 644 return 0; 645 tm = localtime(&Start); 646 Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth; 647 Year = Month / 12; 648 Month = Month % 12 + 1; 649 return DSTcorrect(Start, 650 Convert(Month, (time_t)tm->tm_mday, Year, 651 (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec, 652 MER24, DSTmaybe)); 653 } 654 655 656 static int 657 LookupWord(char *buff) 658 { 659 char *p; 660 char *q; 661 const TABLE *tp; 662 int i; 663 int abbrev; 664 665 /* Make it lowercase. */ 666 for (p = buff; *p; p++) 667 if (isupper(*p)) 668 *p = tolower(*p); 669 670 if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) { 671 yylval.Meridian = MERam; 672 return tMERIDIAN; 673 } 674 if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) { 675 yylval.Meridian = MERpm; 676 return tMERIDIAN; 677 } 678 679 /* See if we have an abbreviation for a month. */ 680 if (strlen(buff) == 3) 681 abbrev = 1; 682 else if (strlen(buff) == 4 && buff[3] == '.') { 683 abbrev = 1; 684 buff[3] = '\0'; 685 } 686 else 687 abbrev = 0; 688 689 for (tp = MonthDayTable; tp->name; tp++) { 690 if (abbrev) { 691 if (strncmp(buff, tp->name, 3) == 0) { 692 yylval.Number = tp->value; 693 return tp->type; 694 } 695 } 696 else if (strcmp(buff, tp->name) == 0) { 697 yylval.Number = tp->value; 698 return tp->type; 699 } 700 } 701 702 for (tp = TimezoneTable; tp->name; tp++) 703 if (strcmp(buff, tp->name) == 0) { 704 yylval.Number = tp->value; 705 return tp->type; 706 } 707 708 if (strcmp(buff, "dst") == 0) 709 return tDST; 710 711 for (tp = UnitsTable; tp->name; tp++) 712 if (strcmp(buff, tp->name) == 0) { 713 yylval.Number = tp->value; 714 return tp->type; 715 } 716 717 /* Strip off any plural and try the units table again. */ 718 i = strlen(buff) - 1; 719 if (buff[i] == 's') { 720 buff[i] = '\0'; 721 for (tp = UnitsTable; tp->name; tp++) 722 if (strcmp(buff, tp->name) == 0) { 723 yylval.Number = tp->value; 724 return tp->type; 725 } 726 buff[i] = 's'; /* Put back for "this" in OtherTable. */ 727 } 728 729 for (tp = OtherTable; tp->name; tp++) 730 if (strcmp(buff, tp->name) == 0) { 731 yylval.Number = tp->value; 732 return tp->type; 733 } 734 735 /* Military timezones. */ 736 if (buff[1] == '\0' && isalpha(*buff)) { 737 for (tp = MilitaryTable; tp->name; tp++) 738 if (strcmp(buff, tp->name) == 0) { 739 yylval.Number = tp->value; 740 return tp->type; 741 } 742 } 743 744 /* Drop out any periods and try the timezone table again. */ 745 for (i = 0, p = q = buff; *q; q++) 746 if (*q != '.') 747 *p++ = *q; 748 else 749 i++; 750 *p = '\0'; 751 if (i) 752 for (tp = TimezoneTable; tp->name; tp++) 753 if (strcmp(buff, tp->name) == 0) { 754 yylval.Number = tp->value; 755 return tp->type; 756 } 757 758 return tID; 759 } 760 761 762 static int 763 yylex(void) 764 { 765 char c; 766 char *p; 767 char buff[20]; 768 int Count; 769 int sign; 770 771 for ( ; ; ) { 772 while (isspace(*yyInput)) 773 yyInput++; 774 775 if (isdigit(c = *yyInput) || c == '-' || c == '+') { 776 if (c == '-' || c == '+') { 777 sign = c == '-' ? -1 : 1; 778 if (!isdigit(*++yyInput)) 779 /* skip the '-' sign */ 780 continue; 781 } 782 else 783 sign = 0; 784 for (yylval.Number = 0; isdigit(c = *yyInput++); ) 785 yylval.Number = 10 * yylval.Number + c - '0'; 786 yyInput--; 787 if (sign < 0) 788 yylval.Number = -yylval.Number; 789 return sign ? tSNUMBER : tUNUMBER; 790 } 791 if (isalpha(c)) { 792 for (p = buff; isalpha(c = *yyInput++) || c == '.'; ) 793 if (p < &buff[sizeof buff - 1]) 794 *p++ = c; 795 *p = '\0'; 796 yyInput--; 797 return LookupWord(buff); 798 } 799 if (c != '(') 800 return *yyInput++; 801 Count = 0; 802 do { 803 c = *yyInput++; 804 if (c == '\0') 805 return c; 806 if (c == '(') 807 Count++; 808 else if (c == ')') 809 Count--; 810 } while (Count > 0); 811 } 812 } 813 814 #define TM_YEAR_ORIGIN 1900 815 816 time_t 817 get_date(char *p) 818 { 819 struct tm *tm, gmt; 820 time_t Start; 821 time_t tod; 822 time_t nowtime; 823 struct tm *gmt_ptr; 824 825 yyInput = p; 826 827 (void)time (&nowtime); 828 829 gmt_ptr = gmtime (&nowtime); 830 if (gmt_ptr != NULL) 831 { 832 /* Make a copy, in case localtime modifies *tm (I think 833 that comment now applies to *gmt_ptr, but I am too 834 lazy to dig into how gmtime and locatime allocate the 835 structures they return pointers to). */ 836 gmt = *gmt_ptr; 837 } 838 839 if (! (tm = localtime (&nowtime))) 840 return -1; 841 842 tm = localtime(&nowtime); 843 yyYear = tm->tm_year + 1900; 844 yyMonth = tm->tm_mon + 1; 845 yyDay = tm->tm_mday; 846 yyTimezone = tm->tm_gmtoff; 847 yyDSTmode = DSTmaybe; 848 yyHour = 0; 849 yyMinutes = 0; 850 yySeconds = 0; 851 yyMeridian = MER24; 852 yyRelSeconds = 0; 853 yyRelMonth = 0; 854 yyHaveDate = 0; 855 yyHaveDay = 0; 856 yyHaveRel = 0; 857 yyHaveTime = 0; 858 yyHaveZone = 0; 859 860 if (yyparse() 861 || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1) 862 return -1; 863 864 if (yyHaveDate || yyHaveTime || yyHaveDay) { 865 Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds, 866 yyMeridian, yyDSTmode); 867 if (Start < 0) 868 return -1; 869 } 870 else { 871 Start = nowtime; 872 if (!yyHaveRel) 873 Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec; 874 } 875 876 Start += yyRelSeconds; 877 Start += RelativeMonth(Start, yyRelMonth); 878 879 if (yyHaveDay && !yyHaveDate) { 880 tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber); 881 Start += tod; 882 } 883 884 /* Have to do *something* with a legitimate -1 so it's distinguishable 885 * from the error return value. (Alternately could set errno on error.) */ 886 return Start == -1 ? 0 : Start; 887 } 888