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 ** send any email to Rich.
9 ** This grammar has 10 shift/reduce conflicts.
11 ** This code is in the public domain and has no copyright.
13 /* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */
14 /* SUPPRESS 288 on yyerrlab *//* Label unused */
24 /* Since the code of getdate.y is not included in the Emacs executable
25 itself, there is no need to #define static in this file. Even if
26 the code were included in the Emacs executable, it probably
27 wouldn't do any harm to #undef it here; this will only cause
28 problems if we try to write to a static variable, which I don't
29 think this code needs to do. */
41 #include <sys/types.h>
42 #ifdef TIME_WITH_SYS_TIME
46 #ifdef HAVE_SYS_TIME_H
54 #undef timezone /* needed for sgi */
57 #if defined (HAVE_SYS_TIMEB_H)
58 #include <sys/timeb.h>
61 /* get_date uses the obsolete `struct timeb' in its interface! FIXME.
62 Since some systems don't have it, we define it here;
63 callers must do likewise. */
66 time_t time; /* Seconds since the epoch */
67 unsigned short millitm; /* Field not used */
68 short timezone; /* Minutes west of GMT */
69 short dstflag; /* Field not used */
71 #endif /* defined (HAVE_SYS_TIMEB_H) */
73 #endif /* defined (vms) */
75 #if defined (STDC_HEADERS) || defined (USG)
79 /* Some old versions of bison generate parsers that use bcopy.
80 That loses on systems that don't provide the function, so we have
81 to redefine it here. */
82 #if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy)
83 #define bcopy(from, to, len) memcpy ((to), (from), (len))
86 extern struct tm *gmtime ();
87 extern struct tm *localtime ();
89 #define yyparse getdate_yyparse
90 #define yylex getdate_yylex
91 #define yyerror getdate_yyerror
94 static int yyerror ();
98 #define HOUR(x) ((time_t)(x) * 60)
99 #define SECSPERDAY (24L * 60L * 60L)
101 #define MAX_BUFF_LEN 128 /* size of buffer to read the date into */
104 ** An entry in the lexical lookup table.
106 typedef struct _TABLE {
114 ** Daylight-savings mode: on, off, or not yet known.
116 typedef enum _DSTMODE {
117 DSTon, DSToff, DSTmaybe
121 ** Meridian: am, pm, or 24-hour style.
123 typedef enum _MERIDIAN {
129 ** Global variables. We could get rid of most of these by using a good
130 ** union as the yacc stack. (This routine was originally written before
131 ** yacc had the %union construct.) Maybe someday; right now we only use
132 ** the %union very rarely.
134 static char *yyInput;
135 static DSTMODE yyDSTmode;
136 static time_t yyDayOrdinal;
137 static time_t yyDayNumber;
138 static int yyHaveDate;
139 static int yyHaveDay;
140 static int yyHaveRel;
141 static int yyHaveTime;
142 static int yyHaveZone;
143 static time_t yyTimezone;
145 static time_t yyHour;
146 static time_t yyMinutes;
147 static time_t yyMonth;
148 static time_t yySeconds;
149 static time_t yyYear;
150 static MERIDIAN yyMeridian;
151 static time_t yyRelMonth;
152 static time_t yyRelSeconds;
158 enum _MERIDIAN Meridian;
161 %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
162 %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
164 %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
165 %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
166 %type <Meridian> tMERIDIAN o_merid
192 time : tUNUMBER tMERIDIAN {
198 | tUNUMBER ':' tUNUMBER o_merid {
204 | tUNUMBER ':' tUNUMBER tSNUMBER {
209 yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
211 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
217 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
223 yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
256 date : tUNUMBER '/' tUNUMBER {
260 | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
265 | tUNUMBER tSNUMBER tSNUMBER {
266 /* ISO 8601 format. yyyy-mm-dd. */
271 | tUNUMBER tMONTH tSNUMBER {
272 /* e.g. 17-JUN-1992. */
281 | tMONTH tUNUMBER ',' tUNUMBER {
290 | tUNUMBER tMONTH tUNUMBER {
298 yyRelSeconds = -yyRelSeconds;
299 yyRelMonth = -yyRelMonth;
304 relunit : tUNUMBER tMINUTE_UNIT {
305 yyRelSeconds += $1 * $2 * 60L;
307 | tSNUMBER tMINUTE_UNIT {
308 yyRelSeconds += $1 * $2 * 60L;
311 yyRelSeconds += $1 * 60L;
313 | tSNUMBER tSEC_UNIT {
316 | tUNUMBER tSEC_UNIT {
322 | tSNUMBER tMONTH_UNIT {
323 yyRelMonth += $1 * $2;
325 | tUNUMBER tMONTH_UNIT {
326 yyRelMonth += $1 * $2;
334 if (yyHaveTime && yyHaveDate && !yyHaveRel)
340 yyMonth= ($1/100)%100;
351 yyMinutes = $1 % 100;
360 o_merid : /* NULL */ {
370 /* Month and day table. */
371 static TABLE const MonthDayTable[] = {
372 { "january", tMONTH, 1 },
373 { "february", tMONTH, 2 },
374 { "march", tMONTH, 3 },
375 { "april", tMONTH, 4 },
376 { "may", tMONTH, 5 },
377 { "june", tMONTH, 6 },
378 { "july", tMONTH, 7 },
379 { "august", tMONTH, 8 },
380 { "september", tMONTH, 9 },
381 { "sept", tMONTH, 9 },
382 { "october", tMONTH, 10 },
383 { "november", tMONTH, 11 },
384 { "december", tMONTH, 12 },
385 { "sunday", tDAY, 0 },
386 { "monday", tDAY, 1 },
387 { "tuesday", tDAY, 2 },
389 { "wednesday", tDAY, 3 },
390 { "wednes", tDAY, 3 },
391 { "thursday", tDAY, 4 },
393 { "thurs", tDAY, 4 },
394 { "friday", tDAY, 5 },
395 { "saturday", tDAY, 6 },
399 /* Time units table. */
400 static TABLE const UnitsTable[] = {
401 { "year", tMONTH_UNIT, 12 },
402 { "month", tMONTH_UNIT, 1 },
403 { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
404 { "week", tMINUTE_UNIT, 7 * 24 * 60 },
405 { "day", tMINUTE_UNIT, 1 * 24 * 60 },
406 { "hour", tMINUTE_UNIT, 60 },
407 { "minute", tMINUTE_UNIT, 1 },
408 { "min", tMINUTE_UNIT, 1 },
409 { "second", tSEC_UNIT, 1 },
410 { "sec", tSEC_UNIT, 1 },
414 /* Assorted relative-time words. */
415 static TABLE const OtherTable[] = {
416 { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
417 { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
418 { "today", tMINUTE_UNIT, 0 },
419 { "now", tMINUTE_UNIT, 0 },
420 { "last", tUNUMBER, -1 },
421 { "this", tMINUTE_UNIT, 0 },
422 { "next", tUNUMBER, 2 },
423 { "first", tUNUMBER, 1 },
424 /* { "second", tUNUMBER, 2 }, */
425 { "third", tUNUMBER, 3 },
426 { "fourth", tUNUMBER, 4 },
427 { "fifth", tUNUMBER, 5 },
428 { "sixth", tUNUMBER, 6 },
429 { "seventh", tUNUMBER, 7 },
430 { "eighth", tUNUMBER, 8 },
431 { "ninth", tUNUMBER, 9 },
432 { "tenth", tUNUMBER, 10 },
433 { "eleventh", tUNUMBER, 11 },
434 { "twelfth", tUNUMBER, 12 },
439 /* The timezone table. */
440 /* Some of these are commented out because a time_t can't store a float. */
441 static TABLE const TimezoneTable[] = {
442 { "gmt", tZONE, HOUR ( 0) }, /* Greenwich Mean */
443 { "ut", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */
444 { "utc", tZONE, HOUR ( 0) },
445 { "wet", tZONE, HOUR ( 0) }, /* Western European */
446 { "bst", tDAYZONE, HOUR ( 0) }, /* British Summer */
447 { "wat", tZONE, HOUR ( 1) }, /* West Africa */
448 { "at", tZONE, HOUR ( 2) }, /* Azores */
450 /* For completeness. BST is also British Summer, and GST is
451 * also Guam Standard. */
452 { "bst", tZONE, HOUR ( 3) }, /* Brazil Standard */
453 { "gst", tZONE, HOUR ( 3) }, /* Greenland Standard */
456 { "nft", tZONE, HOUR (3.5) }, /* Newfoundland */
457 { "nst", tZONE, HOUR (3.5) }, /* Newfoundland Standard */
458 { "ndt", tDAYZONE, HOUR (3.5) }, /* Newfoundland Daylight */
460 { "ast", tZONE, HOUR ( 4) }, /* Atlantic Standard */
461 { "adt", tDAYZONE, HOUR ( 4) }, /* Atlantic Daylight */
462 { "est", tZONE, HOUR ( 5) }, /* Eastern Standard */
463 { "edt", tDAYZONE, HOUR ( 5) }, /* Eastern Daylight */
464 { "cst", tZONE, HOUR ( 6) }, /* Central Standard */
465 { "cdt", tDAYZONE, HOUR ( 6) }, /* Central Daylight */
466 { "mst", tZONE, HOUR ( 7) }, /* Mountain Standard */
467 { "mdt", tDAYZONE, HOUR ( 7) }, /* Mountain Daylight */
468 { "pst", tZONE, HOUR ( 8) }, /* Pacific Standard */
469 { "pdt", tDAYZONE, HOUR ( 8) }, /* Pacific Daylight */
470 { "yst", tZONE, HOUR ( 9) }, /* Yukon Standard */
471 { "ydt", tDAYZONE, HOUR ( 9) }, /* Yukon Daylight */
472 { "hst", tZONE, HOUR (10) }, /* Hawaii Standard */
473 { "hdt", tDAYZONE, HOUR (10) }, /* Hawaii Daylight */
474 { "cat", tZONE, HOUR (10) }, /* Central Alaska */
475 { "ahst", tZONE, HOUR (10) }, /* Alaska-Hawaii Standard */
476 { "nt", tZONE, HOUR (11) }, /* Nome */
477 { "idlw", tZONE, HOUR (12) }, /* International Date Line West */
478 { "cet", tZONE, -HOUR (1) }, /* Central European */
479 { "met", tZONE, -HOUR (1) }, /* Middle European */
480 { "mewt", tZONE, -HOUR (1) }, /* Middle European Winter */
481 { "mest", tDAYZONE, -HOUR (1) }, /* Middle European Summer */
482 { "mesz", tDAYZONE, -HOUR (1) }, /* Middle European Summer */
483 { "swt", tZONE, -HOUR (1) }, /* Swedish Winter */
484 { "sst", tDAYZONE, -HOUR (1) }, /* Swedish Summer */
485 { "fwt", tZONE, -HOUR (1) }, /* French Winter */
486 { "fst", tDAYZONE, -HOUR (1) }, /* French Summer */
487 { "eet", tZONE, -HOUR (2) }, /* Eastern Europe, USSR Zone 1 */
488 { "bt", tZONE, -HOUR (3) }, /* Baghdad, USSR Zone 2 */
490 { "it", tZONE, -HOUR (3.5) },/* Iran */
492 { "zp4", tZONE, -HOUR (4) }, /* USSR Zone 3 */
493 { "zp5", tZONE, -HOUR (5) }, /* USSR Zone 4 */
495 { "ist", tZONE, -HOUR (5.5) },/* Indian Standard */
497 { "zp6", tZONE, -HOUR (6) }, /* USSR Zone 5 */
499 /* For completeness. NST is also Newfoundland Standard, and SST is
500 * also Swedish Summer. */
501 { "nst", tZONE, -HOUR (6.5) },/* North Sumatra */
502 { "sst", tZONE, -HOUR (7) }, /* South Sumatra, USSR Zone 6 */
504 { "wast", tZONE, -HOUR (7) }, /* West Australian Standard */
505 { "wadt", tDAYZONE, -HOUR (7) }, /* West Australian Daylight */
507 { "jt", tZONE, -HOUR (7.5) },/* Java (3pm in Cronusland!) */
509 { "cct", tZONE, -HOUR (8) }, /* China Coast, USSR Zone 7 */
510 { "jst", tZONE, -HOUR (9) }, /* Japan Standard, USSR Zone 8 */
512 { "cast", tZONE, -HOUR (9.5) },/* Central Australian Standard */
513 { "cadt", tDAYZONE, -HOUR (9.5) },/* Central Australian Daylight */
515 { "east", tZONE, -HOUR (10) }, /* Eastern Australian Standard */
516 { "eadt", tDAYZONE, -HOUR (10) }, /* Eastern Australian Daylight */
517 { "gst", tZONE, -HOUR (10) }, /* Guam Standard, USSR Zone 9 */
518 { "nzt", tZONE, -HOUR (12) }, /* New Zealand */
519 { "nzst", tZONE, -HOUR (12) }, /* New Zealand Standard */
520 { "nzdt", tDAYZONE, -HOUR (12) }, /* New Zealand Daylight */
521 { "idle", tZONE, -HOUR (12) }, /* International Date Line East */
525 /* Military timezone table. */
526 static TABLE const MilitaryTable[] = {
527 { "a", tZONE, HOUR ( 1) },
528 { "b", tZONE, HOUR ( 2) },
529 { "c", tZONE, HOUR ( 3) },
530 { "d", tZONE, HOUR ( 4) },
531 { "e", tZONE, HOUR ( 5) },
532 { "f", tZONE, HOUR ( 6) },
533 { "g", tZONE, HOUR ( 7) },
534 { "h", tZONE, HOUR ( 8) },
535 { "i", tZONE, HOUR ( 9) },
536 { "k", tZONE, HOUR ( 10) },
537 { "l", tZONE, HOUR ( 11) },
538 { "m", tZONE, HOUR ( 12) },
539 { "n", tZONE, HOUR (- 1) },
540 { "o", tZONE, HOUR (- 2) },
541 { "p", tZONE, HOUR (- 3) },
542 { "q", tZONE, HOUR (- 4) },
543 { "r", tZONE, HOUR (- 5) },
544 { "s", tZONE, HOUR (- 6) },
545 { "t", tZONE, HOUR (- 7) },
546 { "u", tZONE, HOUR (- 8) },
547 { "v", tZONE, HOUR (- 9) },
548 { "w", tZONE, HOUR (-10) },
549 { "x", tZONE, HOUR (-11) },
550 { "y", tZONE, HOUR (-12) },
551 { "z", tZONE, HOUR ( 0) },
568 ToSeconds (Hours, Minutes, Seconds, Meridian)
574 if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
578 if (Hours < 0 || Hours > 23)
580 return (Hours * 60L + Minutes) * 60L + Seconds;
582 if (Hours < 1 || Hours > 12)
586 return (Hours * 60L + Minutes) * 60L + Seconds;
588 if (Hours < 1 || Hours > 12)
592 return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
601 Convert (Month, Day, Year, Hours, Minutes, Seconds, Meridian, DSTmode)
611 static int DaysInMonth[12] = {
612 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
620 if (Year < DOOMSDAY-2000)
624 DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
626 if (Year < EPOCH || Year >= DOOMSDAY
627 || Month < 1 || Month > 12
628 /* Lint fluff: "conversion from long may lose accuracy" */
629 || Day < 1 || Day > DaysInMonth[(int)--Month])
632 for (Julian = Day - 1, i = 0; i < Month; i++)
633 Julian += DaysInMonth[i];
634 for (i = EPOCH; i < Year; i++)
635 Julian += 365 + (i % 4 == 0);
636 Julian *= SECSPERDAY;
637 Julian += yyTimezone * 60L;
638 if ((tod = ToSeconds (Hours, Minutes, Seconds, Meridian)) < 0)
642 || (DSTmode == DSTmaybe && localtime (&Julian)->tm_isdst))
649 DSTcorrect (Start, Future)
656 StartDay = (localtime (&Start)->tm_hour + 1) % 24;
657 FutureDay = (localtime (&Future)->tm_hour + 1) % 24;
658 return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
663 RelativeDate (Start, DayOrdinal, DayNumber)
672 tm = localtime (&now);
673 now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
674 now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
675 return DSTcorrect (Start, now);
680 RelativeMonth (Start, RelMonth)
690 tm = localtime (&Start);
691 Month = 12 * (1900 + tm->tm_year) + tm->tm_mon + RelMonth;
693 Month = Month % 12 + 1;
694 return DSTcorrect (Start,
695 Convert (Month, (time_t)tm->tm_mday, Year,
696 (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
707 register const TABLE *tp;
711 /* Make it lowercase. */
712 for (p = buff; *p; p++)
716 if (strcmp (buff, "am") == 0 || strcmp (buff, "a.m.") == 0) {
717 yylval.Meridian = MERam;
720 if (strcmp (buff, "pm") == 0 || strcmp (buff, "p.m.") == 0) {
721 yylval.Meridian = MERpm;
725 /* See if we have an abbreviation for a month. */
726 if (strlen (buff) == 3)
728 else if (strlen (buff) == 4 && buff[3] == '.') {
735 for (tp = MonthDayTable; tp->name; tp++) {
737 if (strncmp (buff, tp->name, 3) == 0) {
738 yylval.Number = tp->value;
742 else if (strcmp (buff, tp->name) == 0) {
743 yylval.Number = tp->value;
748 for (tp = TimezoneTable; tp->name; tp++)
749 if (strcmp (buff, tp->name) == 0) {
750 yylval.Number = tp->value;
754 if (strcmp (buff, "dst") == 0)
757 for (tp = UnitsTable; tp->name; tp++)
758 if (strcmp (buff, tp->name) == 0) {
759 yylval.Number = tp->value;
763 /* Strip off any plural and try the units table again. */
764 i = strlen (buff) - 1;
765 if (buff[i] == 's') {
767 for (tp = UnitsTable; tp->name; tp++)
768 if (strcmp (buff, tp->name) == 0) {
769 yylval.Number = tp->value;
772 buff[i] = 's'; /* Put back for "this" in OtherTable. */
775 for (tp = OtherTable; tp->name; tp++)
776 if (strcmp (buff, tp->name) == 0) {
777 yylval.Number = tp->value;
781 /* Military timezones. */
782 if (buff[1] == '\0' && isalpha (*buff)) {
783 for (tp = MilitaryTable; tp->name; tp++)
784 if (strcmp (buff, tp->name) == 0) {
785 yylval.Number = tp->value;
790 /* Drop out any periods and try the timezone table again. */
791 for (i = 0, p = q = buff; *q; q++)
798 for (tp = TimezoneTable; tp->name; tp++)
799 if (strcmp (buff, tp->name) == 0) {
800 yylval.Number = tp->value;
818 while (isspace (*yyInput))
821 if (isdigit (c = *yyInput) || c == '-' || c == '+') {
822 if (c == '-' || c == '+') {
823 sign = c == '-' ? -1 : 1;
824 if (!isdigit (*++yyInput))
825 /* skip the '-' sign */
830 for (yylval.Number = 0; isdigit (c = *yyInput++); )
831 yylval.Number = 10 * yylval.Number + c - '0';
834 yylval.Number = -yylval.Number;
835 return sign ? tSNUMBER : tUNUMBER;
838 for (p = buff; isalpha (c = *yyInput++) || c == '.'; )
839 if (p < &buff[sizeof buff - 1])
843 return LookupWord (buff);
860 #define TM_YEAR_ORIGIN 1900
862 /* Yield A - B, measured in seconds. */
867 int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
868 int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
870 /* difference in day of year */
871 a->tm_yday - b->tm_yday
872 /* + intervening leap days */
873 + ((ay >> 2) - (by >> 2))
875 + ((ay/100 >> 2) - (by/100 >> 2))
876 /* + difference in years * 365 */
877 + (long)(ay-by) * 365
879 return (60*(60*(24*days + (a->tm_hour - b->tm_hour))
880 + (a->tm_min - b->tm_min))
881 + (a->tm_sec - b->tm_sec));
897 (void)time (&ftz.time);
899 if (! (tm = gmtime (&ftz.time)))
901 gmt = *tm; /* Make a copy, in case localtime modifies *tm. */
903 if (! (tm = localtime (&ftz.time)))
906 ftz.timezone = difftm (&gmt, tm) / 60;
911 tm = localtime (&now->time);
912 yyYear = tm->tm_year;
913 yyMonth = tm->tm_mon + 1;
915 yyTimezone = now->timezone;
916 yyDSTmode = DSTmaybe;
930 || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1)
933 if (yyHaveDate || yyHaveTime || yyHaveDay) {
934 Start = Convert (yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds,
935 yyMeridian, yyDSTmode);
942 Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
945 Start += yyRelSeconds;
946 Start += RelativeMonth (Start, yyRelMonth);
948 if (yyHaveDay && !yyHaveDate) {
949 tod = RelativeDate (Start, yyDayOrdinal, yyDayNumber);
953 /* Have to do *something* with a legitimate -1 so it's distinguishable
954 * from the error return value. (Alternately could set errno on error.) */
955 return Start == -1 ? 0 : Start;
967 char buff[MAX_BUFF_LEN + 1];
970 (void)printf ("Enter date, or blank line to exit.\n\t> ");
971 (void)fflush (stdout);
973 buff[MAX_BUFF_LEN] = 0;
974 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0]) {
975 d = get_date (buff, (struct timeb *)NULL);
977 (void)printf ("Bad format - couldn't convert.\n");
979 (void)printf ("%s", ctime (&d));
980 (void)printf ("\t> ");
981 (void)fflush (stdout);
986 #endif /* defined (TEST) */