32static int yylex(void);
33static int yyerror(const char *);
34
35#define EPOCH 1970
36#define HOUR(x) ((time_t)(x) * 60)
37#define SECSPERDAY (24L * 60L * 60L)
38
39
40/*
41** An entry in the lexical lookup table.
42*/
43typedef struct _TABLE {
44 const char *name;
45 int type;
46 time_t value;
47} TABLE;
48
49
50/*
51** Daylight-savings mode: on, off, or not yet known.
52*/
53typedef enum _DSTMODE {
54 DSToff, DSTon, DSTmaybe
55} DSTMODE;
56
57/*
58** Meridian: am, pm, or 24-hour style.
59*/
60typedef enum _MERIDIAN {
61 MERam, MERpm, MER24
62} MERIDIAN;
63
64
65/*
66** Global variables. We could get rid of most of these by using a good
67** union as the yacc stack. (This routine was originally written before
68** yacc had the %union construct.) Maybe someday; right now we only use
69** the %union very rarely.
70*/
71static char *yyInput;
72static DSTMODE yyDSTmode;
73static time_t yyDayOrdinal;
74static time_t yyDayNumber;
75static int yyHaveDate;
76static int yyHaveDay;
77static int yyHaveRel;
78static int yyHaveTime;
79static int yyHaveZone;
80static time_t yyTimezone;
81static time_t yyDay;
82static time_t yyHour;
83static time_t yyMinutes;
84static time_t yyMonth;
85static time_t yySeconds;
86static time_t yyYear;
87static MERIDIAN yyMeridian;
88static time_t yyRelMonth;
89static time_t yyRelSeconds;
90
91%}
92
93%union {
94 time_t Number;
95 enum _MERIDIAN Meridian;
96}
97
98%token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
99%token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
100
101%type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
102%type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
103%type <Meridian> tMERIDIAN o_merid
104
105%%
106
107spec : /* NULL */
108 | spec item
109 ;
110
111item : time {
112 yyHaveTime++;
113 }
114 | zone {
115 yyHaveZone++;
116 }
117 | date {
118 yyHaveDate++;
119 }
120 | day {
121 yyHaveDay++;
122 }
123 | rel {
124 yyHaveRel++;
125 }
126 | cvsstamp {
127 yyHaveTime++;
128 yyHaveDate++;
129 yyHaveZone++;
130 }
131 | number
132 ;
133
134cvsstamp: tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER {
135 yyYear = $1;
136 if (yyYear < 100) yyYear += 1900;
137 yyMonth = $3;
138 yyDay = $5;
139 yyHour = $7;
140 yyMinutes = $9;
141 yySeconds = $11;
142 yyDSTmode = DSToff;
143 yyTimezone = 0;
144 }
145 ;
146
147time : tUNUMBER tMERIDIAN {
148 yyHour = $1;
149 yyMinutes = 0;
150 yySeconds = 0;
151 yyMeridian = $2;
152 }
153 | tUNUMBER ':' tUNUMBER o_merid {
154 yyHour = $1;
155 yyMinutes = $3;
156 yySeconds = 0;
157 yyMeridian = $4;
158 }
159 | tUNUMBER ':' tUNUMBER tSNUMBER {
160 yyHour = $1;
161 yyMinutes = $3;
162 yyMeridian = MER24;
163 yyDSTmode = DSToff;
164 yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
165 }
166 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
167 yyHour = $1;
168 yyMinutes = $3;
169 yySeconds = $5;
170 yyMeridian = $6;
171 }
172 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
173 yyHour = $1;
174 yyMinutes = $3;
175 yySeconds = $5;
176 yyMeridian = MER24;
177 yyDSTmode = DSToff;
178 yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
179 }
180 ;
181
182zone : tZONE {
183 yyTimezone = $1;
184 yyDSTmode = DSToff;
185 }
186 | tDAYZONE {
187 yyTimezone = $1;
188 yyDSTmode = DSTon;
189 }
190 |
191 tZONE tDST {
192 yyTimezone = $1;
193 yyDSTmode = DSTon;
194 }
195 ;
196
197day : tDAY {
198 yyDayOrdinal = 1;
199 yyDayNumber = $1;
200 }
201 | tDAY ',' {
202 yyDayOrdinal = 1;
203 yyDayNumber = $1;
204 }
205 | tUNUMBER tDAY {
206 yyDayOrdinal = $1;
207 yyDayNumber = $2;
208 }
209 ;
210
211date : tUNUMBER '/' tUNUMBER {
212 yyMonth = $1;
213 yyDay = $3;
214 }
215 | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
216 if ($1 >= 100) {
217 yyYear = $1;
218 yyMonth = $3;
219 yyDay = $5;
220 } else {
221 yyMonth = $1;
222 yyDay = $3;
223 yyYear = $5;
224 }
225 }
226 | tUNUMBER tSNUMBER tSNUMBER {
227 /* ISO 8601 format. yyyy-mm-dd. */
228 yyYear = $1;
229 yyMonth = -$2;
230 yyDay = -$3;
231 }
232 | tUNUMBER tMONTH tSNUMBER {
233 /* e.g. 17-JUN-1992. */
234 yyDay = $1;
235 yyMonth = $2;
236 yyYear = -$3;
237 }
238 | tMONTH tUNUMBER {
239 yyMonth = $1;
240 yyDay = $2;
241 }
242 | tMONTH tUNUMBER ',' tUNUMBER {
243 yyMonth = $1;
244 yyDay = $2;
245 yyYear = $4;
246 }
247 | tUNUMBER tMONTH {
248 yyMonth = $2;
249 yyDay = $1;
250 }
251 | tUNUMBER tMONTH tUNUMBER {
252 yyMonth = $2;
253 yyDay = $1;
254 yyYear = $3;
255 }
256 ;
257
258rel : relunit tAGO {
259 yyRelSeconds = -yyRelSeconds;
260 yyRelMonth = -yyRelMonth;
261 }
262 | relunit
263 ;
264
265relunit : tUNUMBER tMINUTE_UNIT {
266 yyRelSeconds += $1 * $2 * 60L;
267 }
268 | tSNUMBER tMINUTE_UNIT {
269 yyRelSeconds += $1 * $2 * 60L;
270 }
271 | tMINUTE_UNIT {
272 yyRelSeconds += $1 * 60L;
273 }
274 | tSNUMBER tSEC_UNIT {
275 yyRelSeconds += $1;
276 }
277 | tUNUMBER tSEC_UNIT {
278 yyRelSeconds += $1;
279 }
280 | tSEC_UNIT {
281 yyRelSeconds++;
282 }
283 | tSNUMBER tMONTH_UNIT {
284 yyRelMonth += $1 * $2;
285 }
286 | tUNUMBER tMONTH_UNIT {
287 yyRelMonth += $1 * $2;
288 }
289 | tMONTH_UNIT {
290 yyRelMonth += $1;
291 }
292 ;
293
294number : tUNUMBER {
295 if (yyHaveTime && yyHaveDate && !yyHaveRel)
296 yyYear = $1;
297 else {
298 if($1>10000) {
299 yyHaveDate++;
300 yyDay= ($1)%100;
301 yyMonth= ($1/100)%100;
302 yyYear = $1/10000;
303 }
304 else {
305 yyHaveTime++;
306 if ($1 < 100) {
307 yyHour = $1;
308 yyMinutes = 0;
309 }
310 else {
311 yyHour = $1 / 100;
312 yyMinutes = $1 % 100;
313 }
314 yySeconds = 0;
315 yyMeridian = MER24;
316 }
317 }
318 }
319 ;
320
321o_merid : /* NULL */ {
322 $$ = MER24;
323 }
324 | tMERIDIAN {
325 $$ = $1;
326 }
327 ;
328
329%%
330
331/* Month and day table. */
332static TABLE const MonthDayTable[] = {
333 { "january", tMONTH, 1 },
334 { "february", tMONTH, 2 },
335 { "march", tMONTH, 3 },
336 { "april", tMONTH, 4 },
337 { "may", tMONTH, 5 },
338 { "june", tMONTH, 6 },
339 { "july", tMONTH, 7 },
340 { "august", tMONTH, 8 },
341 { "september", tMONTH, 9 },
342 { "sept", tMONTH, 9 },
343 { "october", tMONTH, 10 },
344 { "november", tMONTH, 11 },
345 { "december", tMONTH, 12 },
346 { "sunday", tDAY, 0 },
347 { "monday", tDAY, 1 },
348 { "tuesday", tDAY, 2 },
349 { "tues", tDAY, 2 },
350 { "wednesday", tDAY, 3 },
351 { "wednes", tDAY, 3 },
352 { "thursday", tDAY, 4 },
353 { "thur", tDAY, 4 },
354 { "thurs", tDAY, 4 },
355 { "friday", tDAY, 5 },
356 { "saturday", tDAY, 6 },
357 { NULL, 0, 0 }
358};
359
360/* Time units table. */
361static TABLE const UnitsTable[] = {
362 { "year", tMONTH_UNIT, 12 },
363 { "month", tMONTH_UNIT, 1 },
364 { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
365 { "week", tMINUTE_UNIT, 7 * 24 * 60 },
366 { "day", tMINUTE_UNIT, 1 * 24 * 60 },
367 { "hour", tMINUTE_UNIT, 60 },
368 { "minute", tMINUTE_UNIT, 1 },
369 { "min", tMINUTE_UNIT, 1 },
370 { "second", tSEC_UNIT, 1 },
371 { "sec", tSEC_UNIT, 1 },
372 { NULL, 0, 0 }
373};
374
375/* Assorted relative-time words. */
376static TABLE const OtherTable[] = {
377 { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
378 { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
379 { "today", tMINUTE_UNIT, 0 },
380 { "now", tMINUTE_UNIT, 0 },
381 { "last", tUNUMBER, -1 },
382 { "this", tMINUTE_UNIT, 0 },
383 { "next", tUNUMBER, 2 },
384 { "first", tUNUMBER, 1 },
385/* { "second", tUNUMBER, 2 }, */
386 { "third", tUNUMBER, 3 },
387 { "fourth", tUNUMBER, 4 },
388 { "fifth", tUNUMBER, 5 },
389 { "sixth", tUNUMBER, 6 },
390 { "seventh", tUNUMBER, 7 },
391 { "eighth", tUNUMBER, 8 },
392 { "ninth", tUNUMBER, 9 },
393 { "tenth", tUNUMBER, 10 },
394 { "eleventh", tUNUMBER, 11 },
395 { "twelfth", tUNUMBER, 12 },
396 { "ago", tAGO, 1 },
397 { NULL, 0, 0 }
398};
399
400/* The timezone table. */
401/* Some of these are commented out because a time_t can't store a float. */
402static TABLE const TimezoneTable[] = {
403 { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
404 { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
405 { "utc", tZONE, HOUR( 0) },
406 { "wet", tZONE, HOUR( 0) }, /* Western European */
407 { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
408 { "wat", tZONE, HOUR( 1) }, /* West Africa */
409 { "at", tZONE, HOUR( 2) }, /* Azores */
410#if 0
411 /* For completeness. BST is also British Summer, and GST is
412 * also Guam Standard. */
413 { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
414 { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
415#endif
416#if 0
417 { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
418 { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
419 { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
420#endif
421 { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
422 { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
423 { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
424 { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
425 { "cst", tZONE, HOUR( 6) }, /* Central Standard */
426 { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
427 { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
428 { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
429 { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
430 { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
431 { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
432 { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
433 { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
434 { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
435 { "cat", tZONE, HOUR(10) }, /* Central Alaska */
436 { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
437 { "nt", tZONE, HOUR(11) }, /* Nome */
438 { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
439 { "cet", tZONE, -HOUR(1) }, /* Central European */
440 { "met", tZONE, -HOUR(1) }, /* Middle European */
441 { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
442 { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
443 { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
444 { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
445 { "fwt", tZONE, -HOUR(1) }, /* French Winter */
446 { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
447 { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
448 { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
449#if 0
450 { "it", tZONE, -HOUR(3.5) },/* Iran */
451#endif
452 { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
453 { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
454#if 0
455 { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
456#endif
457 { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
458#if 0
459 /* For completeness. NST is also Newfoundland Stanard, and SST is
460 * also Swedish Summer. */
461 { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
462 { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
463#endif /* 0 */
464 { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
465 { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
466#if 0
467 { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
468#endif
469 { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
470 { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
471#if 0
472 { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
473 { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
474#endif
475 { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
476 { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
477 { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
478 { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
479 { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
480 { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
481 { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
482 { NULL, 0, 0 }
483};
484
485/* Military timezone table. */
486static TABLE const MilitaryTable[] = {
487 { "a", tZONE, HOUR( 1) },
488 { "b", tZONE, HOUR( 2) },
489 { "c", tZONE, HOUR( 3) },
490 { "d", tZONE, HOUR( 4) },
491 { "e", tZONE, HOUR( 5) },
492 { "f", tZONE, HOUR( 6) },
493 { "g", tZONE, HOUR( 7) },
494 { "h", tZONE, HOUR( 8) },
495 { "i", tZONE, HOUR( 9) },
496 { "k", tZONE, HOUR( 10) },
497 { "l", tZONE, HOUR( 11) },
498 { "m", tZONE, HOUR( 12) },
499 { "n", tZONE, HOUR(- 1) },
500 { "o", tZONE, HOUR(- 2) },
501 { "p", tZONE, HOUR(- 3) },
502 { "q", tZONE, HOUR(- 4) },
503 { "r", tZONE, HOUR(- 5) },
504 { "s", tZONE, HOUR(- 6) },
505 { "t", tZONE, HOUR(- 7) },
506 { "u", tZONE, HOUR(- 8) },
507 { "v", tZONE, HOUR(- 9) },
508 { "w", tZONE, HOUR(-10) },
509 { "x", tZONE, HOUR(-11) },
510 { "y", tZONE, HOUR(-12) },
511 { "z", tZONE, HOUR( 0) },
512 { NULL, 0, 0 }
513};
514
515
516
517
518/* ARGSUSED */
519static int
520yyerror(const char *s __unused)
521{
522 return 0;
523}
524
525
526static time_t
527ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
528{
529 if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
530 return -1;
531 switch (Meridian) {
532 case MER24:
533 if (Hours < 0 || Hours > 23)
534 return -1;
535 return (Hours * 60L + Minutes) * 60L + Seconds;
536 case MERam:
537 if (Hours < 1 || Hours > 12)
538 return -1;
539 if (Hours == 12)
540 Hours = 0;
541 return (Hours * 60L + Minutes) * 60L + Seconds;
542 case MERpm:
543 if (Hours < 1 || Hours > 12)
544 return -1;
545 if (Hours == 12)
546 Hours = 0;
547 return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
548 default:
549 abort ();
550 }
551 /* NOTREACHED */
552}
553
554
555/* Year is either
556 * A negative number, which means to use its absolute value (why?)
557 * A number from 0 to 99, which means a year from 1900 to 1999, or
558 * The actual year (>=100). */
559static time_t
560Convert(time_t Month, time_t Day, time_t Year,
561 time_t Hours, time_t Minutes, time_t Seconds,
562 MERIDIAN Meridian, DSTMODE DSTmode)
563{
564 static int DaysInMonth[12] = {
565 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
566 };
567 time_t tod;
568 time_t Julian;
569 int i;
570 struct tm *ltm;
571
572 if (Year < 0)
573 Year = -Year;
574 if (Year < 69)
575 Year += 2000;
576 else if (Year < 100)
577 Year += 1900;
578 DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
579 ? 29 : 28;
580 /* Checking for 2038 bogusly assumes that time_t is 32 bits. But
581 I'm too lazy to try to check for time_t overflow in another way. */
582 if (Year < EPOCH || Year > 2038
583 || Month < 1 || Month > 12
584 /* Lint fluff: "conversion from long may lose accuracy" */
585 || Day < 1 || Day > DaysInMonth[(int)--Month])
586 /* FIXME:
587 * It would be nice to set a global error string here.
588 * "February 30 is not a valid date" is much more informative than
589 * "Can't parse date/time: 100 months" when the user input was
590 * "100 months" and addition resolved that to February 30, for
591 * example. See rcs2-7 in src/sanity.sh for more. */
592 return -1;
593
594 for (Julian = Day - 1, i = 0; i < Month; i++)
595 Julian += DaysInMonth[i];
596 for (i = EPOCH; i < Year; i++)
597 Julian += 365 + (i % 4 == 0);
598 Julian *= SECSPERDAY;
599 Julian += yyTimezone * 60L;
600 if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
601 return -1;
602 Julian += tod;
603 ltm = localtime(&Julian);
604fprintf(stderr, "DST %d TZ %s %d\n", DSTmode, ltm->tm_zone, ltm->tm_isdst);
605 if (DSTmode == DSTon
606 || (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst))
607 Julian -= 60 * 60;
608 return Julian;
609}
610
611
612static time_t
613DSTcorrect(time_t Start, time_t Future)
614{
615 time_t StartDay;
616 time_t FutureDay;
617
618 StartDay = (localtime(&Start)->tm_hour + 1) % 24;
619 FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
620 return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
621}
622
623
624static time_t
625RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber)
626{
627 struct tm *tm;
628 time_t now;
629
630 now = Start;
631 tm = localtime(&now);
632 now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
633 now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
634 return DSTcorrect(Start, now);
635}
636
637
638static time_t
639RelativeMonth(time_t Start, time_t RelMonth)
640{
641 struct tm *tm;
642 time_t Month;
643 time_t Year;
644
645 if (RelMonth == 0)
646 return 0;
647 tm = localtime(&Start);
648 Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth;
649 Year = Month / 12;
650 Month = Month % 12 + 1;
651 return DSTcorrect(Start,
652 Convert(Month, (time_t)tm->tm_mday, Year,
653 (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
654 MER24, DSTmaybe));
655}
656
657
658static int
659LookupWord(char *buff)
660{
661 char *p;
662 char *q;
663 const TABLE *tp;
664 int i;
665 int abbrev;
666
667 /* Make it lowercase. */
668 for (p = buff; *p; p++)
669 if (isupper(*p))
670 *p = tolower(*p);
671
672 if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
673 yylval.Meridian = MERam;
674 return tMERIDIAN;
675 }
676 if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
677 yylval.Meridian = MERpm;
678 return tMERIDIAN;
679 }
680
681 /* See if we have an abbreviation for a month. */
682 if (strlen(buff) == 3)
683 abbrev = 1;
684 else if (strlen(buff) == 4 && buff[3] == '.') {
685 abbrev = 1;
686 buff[3] = '\0';
687 }
688 else
689 abbrev = 0;
690
691 for (tp = MonthDayTable; tp->name; tp++) {
692 if (abbrev) {
693 if (strncmp(buff, tp->name, 3) == 0) {
694 yylval.Number = tp->value;
695 return tp->type;
696 }
697 }
698 else if (strcmp(buff, tp->name) == 0) {
699 yylval.Number = tp->value;
700 return tp->type;
701 }
702 }
703
704 for (tp = TimezoneTable; tp->name; tp++)
705 if (strcmp(buff, tp->name) == 0) {
706 yylval.Number = tp->value;
707 return tp->type;
708 }
709
710 if (strcmp(buff, "dst") == 0)
711 return tDST;
712
713 for (tp = UnitsTable; tp->name; tp++)
714 if (strcmp(buff, tp->name) == 0) {
715 yylval.Number = tp->value;
716 return tp->type;
717 }
718
719 /* Strip off any plural and try the units table again. */
720 i = strlen(buff) - 1;
721 if (buff[i] == 's') {
722 buff[i] = '\0';
723 for (tp = UnitsTable; tp->name; tp++)
724 if (strcmp(buff, tp->name) == 0) {
725 yylval.Number = tp->value;
726 return tp->type;
727 }
728 buff[i] = 's'; /* Put back for "this" in OtherTable. */
729 }
730
731 for (tp = OtherTable; tp->name; tp++)
732 if (strcmp(buff, tp->name) == 0) {
733 yylval.Number = tp->value;
734 return tp->type;
735 }
736
737 /* Military timezones. */
738 if (buff[1] == '\0' && isalpha(*buff)) {
739 for (tp = MilitaryTable; tp->name; tp++)
740 if (strcmp(buff, tp->name) == 0) {
741 yylval.Number = tp->value;
742 return tp->type;
743 }
744 }
745
746 /* Drop out any periods and try the timezone table again. */
747 for (i = 0, p = q = buff; *q; q++)
748 if (*q != '.')
749 *p++ = *q;
750 else
751 i++;
752 *p = '\0';
753 if (i)
754 for (tp = TimezoneTable; tp->name; tp++)
755 if (strcmp(buff, tp->name) == 0) {
756 yylval.Number = tp->value;
757 return tp->type;
758 }
759
760 return tID;
761}
762
763
764static int
765yylex(void)
766{
767 char c;
768 char *p;
769 char buff[20];
770 int Count;
771 int sign;
772
773 for ( ; ; ) {
774 while (isspace(*yyInput))
775 yyInput++;
776
777 if (isdigit(c = *yyInput) || c == '-' || c == '+') {
778 if (c == '-' || c == '+') {
779 sign = c == '-' ? -1 : 1;
780 if (!isdigit(*++yyInput))
781 /* skip the '-' sign */
782 continue;
783 }
784 else
785 sign = 0;
786 for (yylval.Number = 0; isdigit(c = *yyInput++); )
787 yylval.Number = 10 * yylval.Number + c - '0';
788 yyInput--;
789 if (sign < 0)
790 yylval.Number = -yylval.Number;
791 return sign ? tSNUMBER : tUNUMBER;
792 }
793 if (isalpha(c)) {
794 for (p = buff; isalpha(c = *yyInput++) || c == '.'; )
795 if (p < &buff[sizeof buff - 1])
796 *p++ = c;
797 *p = '\0';
798 yyInput--;
799 return LookupWord(buff);
800 }
801 if (c != '(')
802 return *yyInput++;
803 Count = 0;
804 do {
805 c = *yyInput++;
806 if (c == '\0')
807 return c;
808 if (c == '(')
809 Count++;
810 else if (c == ')')
811 Count--;
812 } while (Count > 0);
813 }
814}
815
816#define TM_YEAR_ORIGIN 1900
817
818time_t
819get_date(char *p)
820{
821 struct tm *tm, gmt;
822 time_t Start;
823 time_t tod;
824 time_t nowtime;
825 struct tm *gmt_ptr;
826
827 yyInput = p;
828
829 (void)time (&nowtime);
830
831 gmt_ptr = gmtime (&nowtime);
832 if (gmt_ptr != NULL)
833 {
834 /* Make a copy, in case localtime modifies *tm (I think
835 that comment now applies to *gmt_ptr, but I am too
836 lazy to dig into how gmtime and locatime allocate the
837 structures they return pointers to). */
838 gmt = *gmt_ptr;
839 }
840
841 if (! (tm = localtime (&nowtime)))
842 return -1;
843
844 tm = localtime(&nowtime);
845 yyYear = tm->tm_year + 1900;
846 yyMonth = tm->tm_mon + 1;
847 yyDay = tm->tm_mday;
848 yyTimezone = tm->tm_gmtoff;
849 yyDSTmode = DSTmaybe;
850 yyHour = 0;
851 yyMinutes = 0;
852 yySeconds = 0;
853 yyMeridian = MER24;
854 yyRelSeconds = 0;
855 yyRelMonth = 0;
856 yyHaveDate = 0;
857 yyHaveDay = 0;
858 yyHaveRel = 0;
859 yyHaveTime = 0;
860 yyHaveZone = 0;
861
862 if (yyparse()
863 || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1)
864 return -1;
865
866 if (yyHaveDate || yyHaveTime || yyHaveDay) {
867 Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds,
868 yyMeridian, yyDSTmode);
869 if (Start < 0)
870 return -1;
871 }
872 else {
873 Start = nowtime;
874 if (!yyHaveRel)
875 Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
876 }
877
878 Start += yyRelSeconds;
879 Start += RelativeMonth(Start, yyRelMonth);
880
881 if (yyHaveDay && !yyHaveDate) {
882 tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
883 Start += tod;
884 }
885
886 /* Have to do *something* with a legitimate -1 so it's distinguishable
887 * from the error return value. (Alternately could set errno on error.) */
888 return Start == -1 ? 0 : Start;
889}
| 30static int yylex(void);
31static 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*/
41typedef 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*/
51typedef enum _DSTMODE {
52 DSToff, DSTon, DSTmaybe
53} DSTMODE;
54
55/*
56** Meridian: am, pm, or 24-hour style.
57*/
58typedef 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*/
69static char *yyInput;
70static DSTMODE yyDSTmode;
71static time_t yyDayOrdinal;
72static time_t yyDayNumber;
73static int yyHaveDate;
74static int yyHaveDay;
75static int yyHaveRel;
76static int yyHaveTime;
77static int yyHaveZone;
78static time_t yyTimezone;
79static time_t yyDay;
80static time_t yyHour;
81static time_t yyMinutes;
82static time_t yyMonth;
83static time_t yySeconds;
84static time_t yyYear;
85static MERIDIAN yyMeridian;
86static time_t yyRelMonth;
87static 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
105spec : /* NULL */
106 | spec item
107 ;
108
109item : 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
132cvsstamp: 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
145time : 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
180zone : 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
195day : 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
209date : 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
256rel : relunit tAGO {
257 yyRelSeconds = -yyRelSeconds;
258 yyRelMonth = -yyRelMonth;
259 }
260 | relunit
261 ;
262
263relunit : 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
292number : 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
319o_merid : /* NULL */ {
320 $$ = MER24;
321 }
322 | tMERIDIAN {
323 $$ = $1;
324 }
325 ;
326
327%%
328
329/* Month and day table. */
330static 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. */
359static 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. */
374static 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. */
400static 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. */
484static 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 */
517static int
518yyerror(const char *s __unused)
519{
520 return 0;
521}
522
523
524static time_t
525ToSeconds(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). */
557static time_t
558Convert(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);
602fprintf(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
610static time_t
611DSTcorrect(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
622static time_t
623RelativeDate(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
636static time_t
637RelativeMonth(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
656static int
657LookupWord(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
762static int
763yylex(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
816time_t
817get_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}
|