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