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1.1 ! misho 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: /* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */ ! 13: /* SUPPRESS 288 on yyerrlab *//* Label unused */ ! 14: ! 15: #include <config.h> ! 16: ! 17: #include <sys/types.h> ! 18: #include <sys/time.h> ! 19: #include <stdio.h> ! 20: #ifdef STDC_HEADERS ! 21: # include <stdlib.h> ! 22: # include <stddef.h> ! 23: #else ! 24: # ifdef HAVE_STDLIB_H ! 25: # include <stdlib.h> ! 26: # endif ! 27: #endif /* STDC_HEADERS */ ! 28: #ifdef HAVE_STRING_H ! 29: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS) ! 30: # include <memory.h> ! 31: # endif ! 32: # include <string.h> ! 33: #endif /* HAVE_STRING_H */ ! 34: #ifdef HAVE_STRINGS_H ! 35: # include <strings.h> ! 36: #endif /* HAVE_STRINGS_H */ ! 37: #if TIME_WITH_SYS_TIME ! 38: # include <time.h> ! 39: #endif ! 40: #include <ctype.h> ! 41: ! 42: #include "missing.h" ! 43: ! 44: ! 45: #define EPOCH 1970 ! 46: #define HOUR(x) ((time_t)(x) * 60) ! 47: #define SECSPERDAY (24L * 60L * 60L) ! 48: ! 49: ! 50: /* ! 51: ** An entry in the lexical lookup table. ! 52: */ ! 53: typedef struct _TABLE { ! 54: char *name; ! 55: int type; ! 56: time_t value; ! 57: } TABLE; ! 58: ! 59: ! 60: /* ! 61: ** Daylight-savings mode: on, off, or not yet known. ! 62: */ ! 63: typedef enum _DSTMODE { ! 64: DSTon, DSToff, DSTmaybe ! 65: } DSTMODE; ! 66: ! 67: /* ! 68: ** Meridian: am, pm, or 24-hour style. ! 69: */ ! 70: typedef enum _MERIDIAN { ! 71: MERam, MERpm, MER24 ! 72: } MERIDIAN; ! 73: ! 74: ! 75: /* ! 76: ** Global variables. We could get rid of most of these by using a good ! 77: ** union as the yacc stack. (This routine was originally written before ! 78: ** yacc had the %union construct.) Maybe someday; right now we only use ! 79: ** the %union very rarely. ! 80: */ ! 81: static char *yyInput; ! 82: static DSTMODE yyDSTmode; ! 83: static time_t yyDayOrdinal; ! 84: static time_t yyDayNumber; ! 85: static int yyHaveDate; ! 86: static int yyHaveDay; ! 87: static int yyHaveRel; ! 88: static int yyHaveTime; ! 89: static int yyHaveZone; ! 90: static time_t yyTimezone; ! 91: static time_t yyDay; ! 92: static time_t yyHour; ! 93: static time_t yyMinutes; ! 94: static time_t yyMonth; ! 95: static time_t yySeconds; ! 96: static time_t yyYear; ! 97: static MERIDIAN yyMeridian; ! 98: static time_t yyRelMonth; ! 99: static time_t yyRelSeconds; ! 100: ! 101: static int yyerror(char *s); ! 102: static int yylex(void); ! 103: int yyparse(void); ! 104: ! 105: %} ! 106: ! 107: %union { ! 108: time_t Number; ! 109: enum _MERIDIAN Meridian; ! 110: } ! 111: ! 112: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT ! 113: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST ! 114: ! 115: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT ! 116: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE ! 117: %type <Meridian> tMERIDIAN o_merid ! 118: ! 119: %% ! 120: ! 121: spec : /* NULL */ ! 122: | spec item ! 123: ; ! 124: ! 125: item : time { ! 126: yyHaveTime++; ! 127: } ! 128: | zone { ! 129: yyHaveZone++; ! 130: } ! 131: | date { ! 132: yyHaveDate++; ! 133: } ! 134: | day { ! 135: yyHaveDay++; ! 136: } ! 137: | rel { ! 138: yyHaveRel++; ! 139: } ! 140: | number ! 141: ; ! 142: ! 143: time : tUNUMBER tMERIDIAN { ! 144: yyHour = $1; ! 145: yyMinutes = 0; ! 146: yySeconds = 0; ! 147: yyMeridian = $2; ! 148: } ! 149: | tUNUMBER ':' tUNUMBER o_merid { ! 150: yyHour = $1; ! 151: yyMinutes = $3; ! 152: yySeconds = 0; ! 153: yyMeridian = $4; ! 154: } ! 155: | tUNUMBER ':' tUNUMBER tSNUMBER { ! 156: yyHour = $1; ! 157: yyMinutes = $3; ! 158: yyMeridian = MER24; ! 159: yyDSTmode = DSToff; ! 160: yyTimezone = - ($4 % 100 + ($4 / 100) * 60); ! 161: } ! 162: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { ! 163: yyHour = $1; ! 164: yyMinutes = $3; ! 165: yySeconds = $5; ! 166: yyMeridian = $6; ! 167: } ! 168: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { ! 169: yyHour = $1; ! 170: yyMinutes = $3; ! 171: yySeconds = $5; ! 172: yyMeridian = MER24; ! 173: yyDSTmode = DSToff; ! 174: yyTimezone = - ($6 % 100 + ($6 / 100) * 60); ! 175: } ! 176: ; ! 177: ! 178: zone : tZONE { ! 179: yyTimezone = $1; ! 180: yyDSTmode = DSToff; ! 181: } ! 182: | tDAYZONE { ! 183: yyTimezone = $1; ! 184: yyDSTmode = DSTon; ! 185: } ! 186: | ! 187: tZONE tDST { ! 188: yyTimezone = $1; ! 189: yyDSTmode = DSTon; ! 190: } ! 191: ; ! 192: ! 193: day : tDAY { ! 194: yyDayOrdinal = 1; ! 195: yyDayNumber = $1; ! 196: } ! 197: | tDAY ',' { ! 198: yyDayOrdinal = 1; ! 199: yyDayNumber = $1; ! 200: } ! 201: | tUNUMBER tDAY { ! 202: yyDayOrdinal = $1; ! 203: yyDayNumber = $2; ! 204: } ! 205: ; ! 206: ! 207: date : tUNUMBER '/' tUNUMBER { ! 208: yyMonth = $1; ! 209: yyDay = $3; ! 210: } ! 211: | tUNUMBER '/' tUNUMBER '/' tUNUMBER { ! 212: if ($1 >= 100) { ! 213: yyYear = $1; ! 214: yyMonth = $3; ! 215: yyDay = $5; ! 216: } else { ! 217: yyMonth = $1; ! 218: yyDay = $3; ! 219: yyYear = $5; ! 220: } ! 221: } ! 222: | tUNUMBER tSNUMBER tSNUMBER { ! 223: /* ISO 8601 format. yyyy-mm-dd. */ ! 224: yyYear = $1; ! 225: yyMonth = -$2; ! 226: yyDay = -$3; ! 227: } ! 228: | tUNUMBER tMONTH tSNUMBER { ! 229: /* e.g. 17-JUN-1992. */ ! 230: yyDay = $1; ! 231: yyMonth = $2; ! 232: yyYear = -$3; ! 233: } ! 234: | tMONTH tUNUMBER { ! 235: yyMonth = $1; ! 236: yyDay = $2; ! 237: } ! 238: | tMONTH tUNUMBER ',' tUNUMBER { ! 239: yyMonth = $1; ! 240: yyDay = $2; ! 241: yyYear = $4; ! 242: } ! 243: | tUNUMBER tMONTH { ! 244: yyMonth = $2; ! 245: yyDay = $1; ! 246: } ! 247: | tUNUMBER tMONTH tUNUMBER { ! 248: yyMonth = $2; ! 249: yyDay = $1; ! 250: yyYear = $3; ! 251: } ! 252: ; ! 253: ! 254: rel : relunit tAGO { ! 255: yyRelSeconds = -yyRelSeconds; ! 256: yyRelMonth = -yyRelMonth; ! 257: } ! 258: | relunit ! 259: ; ! 260: ! 261: relunit : tUNUMBER tMINUTE_UNIT { ! 262: yyRelSeconds += $1 * $2 * 60L; ! 263: } ! 264: | tSNUMBER tMINUTE_UNIT { ! 265: yyRelSeconds += $1 * $2 * 60L; ! 266: } ! 267: | tMINUTE_UNIT { ! 268: yyRelSeconds += $1 * 60L; ! 269: } ! 270: | tSNUMBER tSEC_UNIT { ! 271: yyRelSeconds += $1; ! 272: } ! 273: | tUNUMBER tSEC_UNIT { ! 274: yyRelSeconds += $1; ! 275: } ! 276: | tSEC_UNIT { ! 277: yyRelSeconds++; ! 278: } ! 279: | tSNUMBER tMONTH_UNIT { ! 280: yyRelMonth += $1 * $2; ! 281: } ! 282: | tUNUMBER tMONTH_UNIT { ! 283: yyRelMonth += $1 * $2; ! 284: } ! 285: | tMONTH_UNIT { ! 286: yyRelMonth += $1; ! 287: } ! 288: ; ! 289: ! 290: number : tUNUMBER { ! 291: if (yyHaveTime && yyHaveDate && !yyHaveRel) ! 292: yyYear = $1; ! 293: else { ! 294: if($1>10000) { ! 295: yyHaveDate++; ! 296: yyDay= ($1)%100; ! 297: yyMonth= ($1/100)%100; ! 298: yyYear = $1/10000; ! 299: } ! 300: else { ! 301: yyHaveTime++; ! 302: if ($1 < 100) { ! 303: yyHour = $1; ! 304: yyMinutes = 0; ! 305: } ! 306: else { ! 307: yyHour = $1 / 100; ! 308: yyMinutes = $1 % 100; ! 309: } ! 310: yySeconds = 0; ! 311: yyMeridian = MER24; ! 312: } ! 313: } ! 314: } ! 315: ; ! 316: ! 317: o_merid : /* NULL */ { ! 318: $$ = MER24; ! 319: } ! 320: | tMERIDIAN { ! 321: $$ = $1; ! 322: } ! 323: ; ! 324: ! 325: %% ! 326: ! 327: /* Month and day table. */ ! 328: static TABLE const MonthDayTable[] = { ! 329: { "january", tMONTH, 1 }, ! 330: { "february", tMONTH, 2 }, ! 331: { "march", tMONTH, 3 }, ! 332: { "april", tMONTH, 4 }, ! 333: { "may", tMONTH, 5 }, ! 334: { "june", tMONTH, 6 }, ! 335: { "july", tMONTH, 7 }, ! 336: { "august", tMONTH, 8 }, ! 337: { "september", tMONTH, 9 }, ! 338: { "sept", tMONTH, 9 }, ! 339: { "october", tMONTH, 10 }, ! 340: { "november", tMONTH, 11 }, ! 341: { "december", tMONTH, 12 }, ! 342: { "sunday", tDAY, 0 }, ! 343: { "monday", tDAY, 1 }, ! 344: { "tuesday", tDAY, 2 }, ! 345: { "tues", tDAY, 2 }, ! 346: { "wednesday", tDAY, 3 }, ! 347: { "wednes", tDAY, 3 }, ! 348: { "thursday", tDAY, 4 }, ! 349: { "thur", tDAY, 4 }, ! 350: { "thurs", tDAY, 4 }, ! 351: { "friday", tDAY, 5 }, ! 352: { "saturday", tDAY, 6 }, ! 353: { NULL } ! 354: }; ! 355: ! 356: /* Time units table. */ ! 357: static TABLE const UnitsTable[] = { ! 358: { "year", tMONTH_UNIT, 12 }, ! 359: { "month", tMONTH_UNIT, 1 }, ! 360: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, ! 361: { "week", tMINUTE_UNIT, 7 * 24 * 60 }, ! 362: { "day", tMINUTE_UNIT, 1 * 24 * 60 }, ! 363: { "hour", tMINUTE_UNIT, 60 }, ! 364: { "minute", tMINUTE_UNIT, 1 }, ! 365: { "min", tMINUTE_UNIT, 1 }, ! 366: { "second", tSEC_UNIT, 1 }, ! 367: { "sec", tSEC_UNIT, 1 }, ! 368: { NULL } ! 369: }; ! 370: ! 371: /* Assorted relative-time words. */ ! 372: static TABLE const OtherTable[] = { ! 373: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, ! 374: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, ! 375: { "today", tMINUTE_UNIT, 0 }, ! 376: { "now", tMINUTE_UNIT, 0 }, ! 377: { "last", tUNUMBER, -1 }, ! 378: { "this", tMINUTE_UNIT, 0 }, ! 379: { "next", tUNUMBER, 2 }, ! 380: { "first", tUNUMBER, 1 }, ! 381: /* { "second", tUNUMBER, 2 }, */ ! 382: { "third", tUNUMBER, 3 }, ! 383: { "fourth", tUNUMBER, 4 }, ! 384: { "fifth", tUNUMBER, 5 }, ! 385: { "sixth", tUNUMBER, 6 }, ! 386: { "seventh", tUNUMBER, 7 }, ! 387: { "eighth", tUNUMBER, 8 }, ! 388: { "ninth", tUNUMBER, 9 }, ! 389: { "tenth", tUNUMBER, 10 }, ! 390: { "eleventh", tUNUMBER, 11 }, ! 391: { "twelfth", tUNUMBER, 12 }, ! 392: { "ago", tAGO, 1 }, ! 393: { NULL } ! 394: }; ! 395: ! 396: /* The timezone table. */ ! 397: /* Some of these are commented out because a time_t can't store a float. */ ! 398: static TABLE const TimezoneTable[] = { ! 399: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ ! 400: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */ ! 401: { "utc", tZONE, HOUR( 0) }, ! 402: { "wet", tZONE, HOUR( 0) }, /* Western European */ ! 403: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ ! 404: { "wat", tZONE, HOUR( 1) }, /* West Africa */ ! 405: { "at", tZONE, HOUR( 2) }, /* Azores */ ! 406: #if 0 ! 407: /* For completeness. BST is also British Summer, and GST is ! 408: * also Guam Standard. */ ! 409: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ ! 410: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ ! 411: #endif ! 412: #if 0 ! 413: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */ ! 414: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */ ! 415: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */ ! 416: #endif ! 417: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ ! 418: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ ! 419: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ ! 420: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ ! 421: { "cst", tZONE, HOUR( 6) }, /* Central Standard */ ! 422: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ ! 423: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ ! 424: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ ! 425: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ ! 426: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ ! 427: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ ! 428: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ ! 429: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ ! 430: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */ ! 431: { "cat", tZONE, HOUR(10) }, /* Central Alaska */ ! 432: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */ ! 433: { "nt", tZONE, HOUR(11) }, /* Nome */ ! 434: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ ! 435: { "cet", tZONE, -HOUR(1) }, /* Central European */ ! 436: { "met", tZONE, -HOUR(1) }, /* Middle European */ ! 437: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ ! 438: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ ! 439: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */ ! 440: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */ ! 441: { "fwt", tZONE, -HOUR(1) }, /* French Winter */ ! 442: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */ ! 443: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */ ! 444: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */ ! 445: #if 0 ! 446: { "it", tZONE, -HOUR(3.5) },/* Iran */ ! 447: #endif ! 448: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */ ! 449: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */ ! 450: #if 0 ! 451: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */ ! 452: #endif ! 453: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */ ! 454: #if 0 ! 455: /* For completeness. NST is also Newfoundland Stanard, and SST is ! 456: * also Swedish Summer. */ ! 457: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */ ! 458: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */ ! 459: #endif /* 0 */ ! 460: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */ ! 461: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */ ! 462: #if 0 ! 463: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */ ! 464: #endif ! 465: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */ ! 466: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */ ! 467: #if 0 ! 468: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */ ! 469: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */ ! 470: #endif ! 471: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ ! 472: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ ! 473: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */ ! 474: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ ! 475: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ ! 476: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ ! 477: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ ! 478: { NULL } ! 479: }; ! 480: ! 481: /* Military timezone table. */ ! 482: static TABLE const MilitaryTable[] = { ! 483: { "a", tZONE, HOUR( 1) }, ! 484: { "b", tZONE, HOUR( 2) }, ! 485: { "c", tZONE, HOUR( 3) }, ! 486: { "d", tZONE, HOUR( 4) }, ! 487: { "e", tZONE, HOUR( 5) }, ! 488: { "f", tZONE, HOUR( 6) }, ! 489: { "g", tZONE, HOUR( 7) }, ! 490: { "h", tZONE, HOUR( 8) }, ! 491: { "i", tZONE, HOUR( 9) }, ! 492: { "k", tZONE, HOUR( 10) }, ! 493: { "l", tZONE, HOUR( 11) }, ! 494: { "m", tZONE, HOUR( 12) }, ! 495: { "n", tZONE, HOUR(- 1) }, ! 496: { "o", tZONE, HOUR(- 2) }, ! 497: { "p", tZONE, HOUR(- 3) }, ! 498: { "q", tZONE, HOUR(- 4) }, ! 499: { "r", tZONE, HOUR(- 5) }, ! 500: { "s", tZONE, HOUR(- 6) }, ! 501: { "t", tZONE, HOUR(- 7) }, ! 502: { "u", tZONE, HOUR(- 8) }, ! 503: { "v", tZONE, HOUR(- 9) }, ! 504: { "w", tZONE, HOUR(-10) }, ! 505: { "x", tZONE, HOUR(-11) }, ! 506: { "y", tZONE, HOUR(-12) }, ! 507: { "z", tZONE, HOUR( 0) }, ! 508: { NULL } ! 509: }; ! 510: ! 511: ! 512: ! 513: ! 514: /* ARGSUSED */ ! 515: static int ! 516: yyerror(s) ! 517: char *s; ! 518: { ! 519: return 0; ! 520: } ! 521: ! 522: ! 523: static time_t ! 524: ToSeconds(Hours, Minutes, Seconds, Meridian) ! 525: time_t Hours; ! 526: time_t Minutes; ! 527: time_t Seconds; ! 528: MERIDIAN Meridian; ! 529: { ! 530: if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) ! 531: return -1; ! 532: switch (Meridian) { ! 533: case MER24: ! 534: if (Hours < 0 || Hours > 23) ! 535: return -1; ! 536: return (Hours * 60L + Minutes) * 60L + Seconds; ! 537: case MERam: ! 538: if (Hours < 1 || Hours > 12) ! 539: return -1; ! 540: if (Hours == 12) ! 541: Hours = 0; ! 542: return (Hours * 60L + Minutes) * 60L + Seconds; ! 543: case MERpm: ! 544: if (Hours < 1 || Hours > 12) ! 545: return -1; ! 546: if (Hours == 12) ! 547: Hours = 0; ! 548: return ((Hours + 12) * 60L + Minutes) * 60L + Seconds; ! 549: default: ! 550: abort (); ! 551: } ! 552: /* NOTREACHED */ ! 553: } ! 554: ! 555: ! 556: /* Year is either ! 557: * A negative number, which means to use its absolute value (why?) ! 558: * A number from 0 to 99, which means a year from 1900 to 1999, or ! 559: * The actual year (>=100). */ ! 560: static time_t ! 561: Convert(Month, Day, Year, Hours, Minutes, Seconds, Meridian, DSTmode) ! 562: time_t Month; ! 563: time_t Day; ! 564: time_t Year; ! 565: time_t Hours; ! 566: time_t Minutes; ! 567: time_t Seconds; ! 568: MERIDIAN Meridian; ! 569: DSTMODE DSTmode; ! 570: { ! 571: static int DaysInMonth[12] = { ! 572: 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ! 573: }; ! 574: time_t tod; ! 575: time_t Julian; ! 576: int i; ! 577: ! 578: if (Year < 0) ! 579: Year = -Year; ! 580: if (Year < 69) ! 581: Year += 2000; ! 582: else if (Year < 100) { ! 583: Year += 1900; ! 584: if (Year < EPOCH) ! 585: Year += 100; ! 586: } ! 587: DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ! 588: ? 29 : 28; ! 589: /* Checking for 2038 bogusly assumes that time_t is 32 bits. But ! 590: I'm too lazy to try to check for time_t overflow in another way. */ ! 591: if (Year < EPOCH || Year > 2038 ! 592: || Month < 1 || Month > 12 ! 593: /* Lint fluff: "conversion from long may lose accuracy" */ ! 594: || Day < 1 || Day > DaysInMonth[(int)--Month]) ! 595: return -1; ! 596: ! 597: for (Julian = Day - 1, i = 0; i < Month; i++) ! 598: Julian += DaysInMonth[i]; ! 599: for (i = EPOCH; i < Year; i++) ! 600: Julian += 365 + (i % 4 == 0); ! 601: Julian *= SECSPERDAY; ! 602: Julian += yyTimezone * 60L; ! 603: if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0) ! 604: return -1; ! 605: Julian += tod; ! 606: if (DSTmode == DSTon ! 607: || (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst)) ! 608: Julian -= 60 * 60; ! 609: return Julian; ! 610: } ! 611: ! 612: ! 613: static time_t ! 614: DSTcorrect(Start, Future) ! 615: time_t Start; ! 616: time_t Future; ! 617: { ! 618: time_t StartDay; ! 619: time_t FutureDay; ! 620: ! 621: StartDay = (localtime(&Start)->tm_hour + 1) % 24; ! 622: FutureDay = (localtime(&Future)->tm_hour + 1) % 24; ! 623: return (Future - Start) + (StartDay - FutureDay) * 60L * 60L; ! 624: } ! 625: ! 626: ! 627: static time_t ! 628: RelativeDate(Start, DayOrdinal, DayNumber) ! 629: time_t Start; ! 630: time_t DayOrdinal; ! 631: time_t DayNumber; ! 632: { ! 633: struct tm *tm; ! 634: time_t now; ! 635: ! 636: now = Start; ! 637: tm = localtime(&now); ! 638: now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7); ! 639: now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1); ! 640: return DSTcorrect(Start, now); ! 641: } ! 642: ! 643: ! 644: static time_t ! 645: RelativeMonth(Start, RelMonth) ! 646: time_t Start; ! 647: time_t RelMonth; ! 648: { ! 649: struct tm *tm; ! 650: time_t Month; ! 651: time_t Year; ! 652: ! 653: if (RelMonth == 0) ! 654: return 0; ! 655: tm = localtime(&Start); ! 656: Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth; ! 657: Year = Month / 12; ! 658: Month = Month % 12 + 1; ! 659: return DSTcorrect(Start, ! 660: Convert(Month, (time_t)tm->tm_mday, Year, ! 661: (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec, ! 662: MER24, DSTmaybe)); ! 663: } ! 664: ! 665: ! 666: static int ! 667: LookupWord(buff) ! 668: char *buff; ! 669: { ! 670: char *p; ! 671: char *q; ! 672: const TABLE *tp; ! 673: int i; ! 674: int abbrev; ! 675: ! 676: /* Make it lowercase. */ ! 677: for (p = buff; *p; p++) ! 678: if (isupper((unsigned char)*p)) ! 679: *p = tolower((unsigned char)*p); ! 680: ! 681: if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) { ! 682: yylval.Meridian = MERam; ! 683: return tMERIDIAN; ! 684: } ! 685: if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) { ! 686: yylval.Meridian = MERpm; ! 687: return tMERIDIAN; ! 688: } ! 689: ! 690: /* See if we have an abbreviation for a month. */ ! 691: if (strlen(buff) == 3) ! 692: abbrev = 1; ! 693: else if (strlen(buff) == 4 && buff[3] == '.') { ! 694: abbrev = 1; ! 695: buff[3] = '\0'; ! 696: } ! 697: else ! 698: abbrev = 0; ! 699: ! 700: for (tp = MonthDayTable; tp->name; tp++) { ! 701: if (abbrev) { ! 702: if (strncmp(buff, tp->name, 3) == 0) { ! 703: yylval.Number = tp->value; ! 704: return tp->type; ! 705: } ! 706: } ! 707: else if (strcmp(buff, tp->name) == 0) { ! 708: yylval.Number = tp->value; ! 709: return tp->type; ! 710: } ! 711: } ! 712: ! 713: for (tp = TimezoneTable; tp->name; tp++) ! 714: if (strcmp(buff, tp->name) == 0) { ! 715: yylval.Number = tp->value; ! 716: return tp->type; ! 717: } ! 718: ! 719: if (strcmp(buff, "dst") == 0) ! 720: return tDST; ! 721: ! 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: ! 728: /* Strip off any plural and try the units table again. */ ! 729: i = strlen(buff) - 1; ! 730: if (buff[i] == 's') { ! 731: buff[i] = '\0'; ! 732: for (tp = UnitsTable; tp->name; tp++) ! 733: if (strcmp(buff, tp->name) == 0) { ! 734: yylval.Number = tp->value; ! 735: return tp->type; ! 736: } ! 737: buff[i] = 's'; /* Put back for "this" in OtherTable. */ ! 738: } ! 739: ! 740: for (tp = OtherTable; tp->name; tp++) ! 741: if (strcmp(buff, tp->name) == 0) { ! 742: yylval.Number = tp->value; ! 743: return tp->type; ! 744: } ! 745: ! 746: /* Military timezones. */ ! 747: if (buff[1] == '\0' && isalpha((unsigned char)*buff)) { ! 748: for (tp = MilitaryTable; tp->name; tp++) ! 749: if (strcmp(buff, tp->name) == 0) { ! 750: yylval.Number = tp->value; ! 751: return tp->type; ! 752: } ! 753: } ! 754: ! 755: /* Drop out any periods and try the timezone table again. */ ! 756: for (i = 0, p = q = buff; *q; q++) ! 757: if (*q != '.') ! 758: *p++ = *q; ! 759: else ! 760: i++; ! 761: *p = '\0'; ! 762: if (i) ! 763: for (tp = TimezoneTable; tp->name; tp++) ! 764: if (strcmp(buff, tp->name) == 0) { ! 765: yylval.Number = tp->value; ! 766: return tp->type; ! 767: } ! 768: ! 769: return tID; ! 770: } ! 771: ! 772: ! 773: static int ! 774: yylex() ! 775: { ! 776: char c; ! 777: char *p; ! 778: char buff[20]; ! 779: int Count; ! 780: int sign; ! 781: ! 782: for ( ; ; ) { ! 783: while (isspace((unsigned char)*yyInput)) ! 784: yyInput++; ! 785: ! 786: if (isdigit((unsigned char)(c = *yyInput)) || c == '-' || c == '+') { ! 787: if (c == '-' || c == '+') { ! 788: sign = c == '-' ? -1 : 1; ! 789: if (!isdigit((unsigned char)*++yyInput)) ! 790: /* skip the '-' sign */ ! 791: continue; ! 792: } ! 793: else ! 794: sign = 0; ! 795: for (yylval.Number = 0; isdigit((unsigned char)(c = *yyInput++)); ) ! 796: yylval.Number = 10 * yylval.Number + c - '0'; ! 797: yyInput--; ! 798: if (sign < 0) ! 799: yylval.Number = -yylval.Number; ! 800: return sign ? tSNUMBER : tUNUMBER; ! 801: } ! 802: if (isalpha((unsigned char)c)) { ! 803: for (p = buff; isalpha((unsigned char)(c = *yyInput++)) || c == '.'; ) ! 804: if (p < &buff[sizeof buff - 1]) ! 805: *p++ = c; ! 806: *p = '\0'; ! 807: yyInput--; ! 808: return LookupWord(buff); ! 809: } ! 810: if (c != '(') ! 811: return *yyInput++; ! 812: Count = 0; ! 813: do { ! 814: c = *yyInput++; ! 815: if (c == '\0') ! 816: return c; ! 817: if (c == '(') ! 818: Count++; ! 819: else if (c == ')') ! 820: Count--; ! 821: } while (Count > 0); ! 822: } ! 823: } ! 824: ! 825: #define TM_YEAR_ORIGIN 1900 ! 826: ! 827: /* Yield A - B, measured in seconds. */ ! 828: static long ! 829: difftm (a, b) ! 830: struct tm *a, *b; ! 831: { ! 832: int ay = a->tm_year + (TM_YEAR_ORIGIN - 1); ! 833: int by = b->tm_year + (TM_YEAR_ORIGIN - 1); ! 834: int days = ( ! 835: /* difference in day of year */ ! 836: a->tm_yday - b->tm_yday ! 837: /* + intervening leap days */ ! 838: + ((ay >> 2) - (by >> 2)) ! 839: - (ay/100 - by/100) ! 840: + ((ay/100 >> 2) - (by/100 >> 2)) ! 841: /* + difference in years * 365 */ ! 842: + (long)(ay-by) * 365 ! 843: ); ! 844: return (60*(60*(24*days + (a->tm_hour - b->tm_hour)) ! 845: + (a->tm_min - b->tm_min)) ! 846: + (a->tm_sec - b->tm_sec)); ! 847: } ! 848: ! 849: time_t ! 850: get_date(p) ! 851: char *p; ! 852: { ! 853: struct tm *tm, *gmt, gmtbuf; ! 854: time_t Start; ! 855: time_t tod; ! 856: time_t now; ! 857: time_t timezone; ! 858: ! 859: yyInput = p; ! 860: (void)time (&now); ! 861: ! 862: gmt = gmtime (&now); ! 863: if (gmt != NULL) ! 864: { ! 865: /* Make a copy, in case localtime modifies *tm (I think ! 866: that comment now applies to *gmt, but I am too ! 867: lazy to dig into how gmtime and locatime allocate the ! 868: structures they return pointers to). */ ! 869: gmtbuf = *gmt; ! 870: gmt = &gmtbuf; ! 871: } ! 872: ! 873: if (! (tm = localtime (&now))) ! 874: return -1; ! 875: ! 876: if (gmt != NULL) ! 877: timezone = difftm (gmt, tm) / 60; ! 878: else ! 879: /* We are on a system like VMS, where the system clock is ! 880: in local time and the system has no concept of timezones. ! 881: Hopefully we can fake this out (for the case in which the ! 882: user specifies no timezone) by just saying the timezone ! 883: is zero. */ ! 884: timezone = 0; ! 885: ! 886: if(tm->tm_isdst) ! 887: timezone += 60; ! 888: ! 889: tm = localtime(&now); ! 890: yyYear = tm->tm_year + 1900; ! 891: yyMonth = tm->tm_mon + 1; ! 892: yyDay = tm->tm_mday; ! 893: yyTimezone = timezone; ! 894: yyDSTmode = DSTmaybe; ! 895: yyHour = 0; ! 896: yyMinutes = 0; ! 897: yySeconds = 0; ! 898: yyMeridian = MER24; ! 899: yyRelSeconds = 0; ! 900: yyRelMonth = 0; ! 901: yyHaveDate = 0; ! 902: yyHaveDay = 0; ! 903: yyHaveRel = 0; ! 904: yyHaveTime = 0; ! 905: yyHaveZone = 0; ! 906: ! 907: if (yyparse() ! 908: || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1) ! 909: return -1; ! 910: ! 911: if (yyHaveDate || yyHaveTime || yyHaveDay) { ! 912: Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds, ! 913: yyMeridian, yyDSTmode); ! 914: if (Start < 0) ! 915: return -1; ! 916: } ! 917: else { ! 918: Start = now; ! 919: if (!yyHaveRel) ! 920: Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec; ! 921: } ! 922: ! 923: Start += yyRelSeconds; ! 924: Start += RelativeMonth(Start, yyRelMonth); ! 925: ! 926: if (yyHaveDay && !yyHaveDate) { ! 927: tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber); ! 928: Start += tod; ! 929: } ! 930: ! 931: /* Have to do *something* with a legitimate -1 so it's distinguishable ! 932: * from the error return value. (Alternately could set errno on error.) */ ! 933: return Start == -1 ? 0 : Start; ! 934: } ! 935: ! 936: ! 937: #if defined(TEST) ! 938: ! 939: /* ARGSUSED */ ! 940: int ! 941: main(ac, av) ! 942: int ac; ! 943: char *av[]; ! 944: { ! 945: char buff[128]; ! 946: time_t d; ! 947: ! 948: (void)printf("Enter date, or blank line to exit.\n\t> "); ! 949: (void)fflush(stdout); ! 950: while (gets(buff) && buff[0]) { ! 951: d = get_date(buff); ! 952: if (d == -1) ! 953: (void)printf("Bad format - couldn't convert.\n"); ! 954: else ! 955: (void)printf("%s", ctime(&d)); ! 956: (void)printf("\t> "); ! 957: (void)fflush(stdout); ! 958: } ! 959: exit(0); ! 960: /* NOTREACHED */ ! 961: } ! 962: #endif /* defined(TEST) */