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
yyerror(const char * s __unused)519 yyerror(const char *s __unused)
520 {
521 return 0;
522 }
523
524
525 static time_t
ToSeconds(time_t Hours,time_t Minutes,time_t Seconds,MERIDIAN Meridian)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
Convert(time_t Month,time_t Day,time_t Year,time_t Hours,time_t Minutes,time_t Seconds,MERIDIAN Meridian,DSTMODE DSTmode)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
DSTcorrect(time_t Start,time_t Future)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
RelativeDate(time_t Start,time_t DayOrdinal,time_t DayNumber)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
RelativeMonth(time_t Start,time_t RelMonth)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
LookupWord(char * buff)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
yylex(void)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
get_date(char * p)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