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: #ifdef 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(const 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", tUNUMBER, 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(const char *s)
517: {
518: return 0;
519: }
520:
521:
522: static time_t
523: ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
524: {
525: if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
526: return -1;
527: switch (Meridian) {
528: case MER24:
529: if (Hours < 0 || Hours > 23)
530: return -1;
531: return (Hours * 60L + Minutes) * 60L + Seconds;
532: case MERam:
533: if (Hours < 1 || Hours > 12)
534: return -1;
535: if (Hours == 12)
536: Hours = 0;
537: return (Hours * 60L + Minutes) * 60L + Seconds;
538: case MERpm:
539: if (Hours < 1 || Hours > 12)
540: return -1;
541: if (Hours == 12)
542: Hours = 0;
543: return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
544: default:
545: abort ();
546: }
547: /* NOTREACHED */
548: }
549:
550:
551: /* Year is either
552: * A negative number, which means to use its absolute value (why?)
553: * A number from 0 to 99, which means a year from 1900 to 1999, or
554: * The actual year (>=100). */
555: static time_t
556: Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes,
557: time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode)
558: {
559: static int DaysInMonth[12] = {
560: 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
561: };
562: struct tm *tm;
563: time_t tod;
564: time_t Julian;
565: int i;
566:
567: if (Year < 0)
568: Year = -Year;
569: if (Year < 69)
570: Year += 2000;
571: else if (Year < 100) {
572: Year += 1900;
573: if (Year < EPOCH)
574: Year += 100;
575: }
576: DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
577: ? 29 : 28;
578: /* 32-bit time_t cannot represent years past 2038 */
579: if (Year < EPOCH || (sizeof(time_t) == sizeof(int) && Year > 2038)
580: || Month < 1 || Month > 12
581: /* Lint fluff: "conversion from long may lose accuracy" */
582: || Day < 1 || Day > DaysInMonth[(int)--Month])
583: return -1;
584:
585: for (Julian = Day - 1, i = 0; i < Month; i++)
586: Julian += DaysInMonth[i];
587: for (i = EPOCH; i < Year; i++)
588: Julian += 365 + (i % 4 == 0);
589: Julian *= SECSPERDAY;
590: Julian += yyTimezone * 60L;
591: if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
592: return -1;
593: Julian += tod;
594: if (DSTmode == DSTon
595: || (DSTmode == DSTmaybe && (tm = localtime(&Julian)) && tm->tm_isdst))
596: Julian -= 60 * 60;
597: return Julian;
598: }
599:
600:
601: static time_t
602: DSTcorrect(time_t Start, time_t Future)
603: {
604: struct tm *start_tm;
605: struct tm *future_tm;
606: time_t StartDay;
607: time_t FutureDay;
608:
609: start_tm = localtime(&Start);
610: future_tm = localtime(&Future);
611: if (!start_tm || !future_tm)
612: return -1;
613:
614: StartDay = (start_tm->tm_hour + 1) % 24;
615: FutureDay = (future_tm->tm_hour + 1) % 24;
616: return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
617: }
618:
619:
620: static time_t
621: RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber)
622: {
623: struct tm *tm;
624: time_t now;
625:
626: now = Start;
627: if (!(tm = localtime(&now)))
628: return -1;
629: now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
630: now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
631: return DSTcorrect(Start, now);
632: }
633:
634:
635: static time_t
636: RelativeMonth(time_t Start, time_t RelMonth)
637: {
638: struct tm *tm;
639: time_t Month;
640: time_t Year;
641:
642: if (RelMonth == 0)
643: return 0;
644: if (!(tm = localtime(&Start)))
645: return -1;
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:
656: static int
657: LookupWord(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((unsigned char)*p))
668: *p = tolower((unsigned char)*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((unsigned char)*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:
762: static int
763: yylex(void)
764: {
765: char c;
766: char *p;
767: char buff[20];
768: int Count;
769: int sign;
770:
771: for ( ; ; ) {
772: while (isspace((unsigned char)*yyInput))
773: yyInput++;
774:
775: if (isdigit((unsigned char)(c = *yyInput)) || c == '-' || c == '+') {
776: if (c == '-' || c == '+') {
777: sign = c == '-' ? -1 : 1;
778: if (!isdigit((unsigned char)*++yyInput))
779: /* skip the '-' sign */
780: continue;
781: }
782: else
783: sign = 0;
784: for (yylval.Number = 0; isdigit((unsigned char)(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((unsigned char)c)) {
792: for (p = buff; isalpha((unsigned char)(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:
816: /* Yield A - B, measured in seconds. */
817: static long
818: difftm(struct tm *a, struct tm *b)
819: {
820: int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
821: int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
822: int days = (
823: /* difference in day of year */
824: a->tm_yday - b->tm_yday
825: /* + intervening leap days */
826: + ((ay >> 2) - (by >> 2))
827: - (ay/100 - by/100)
828: + ((ay/100 >> 2) - (by/100 >> 2))
829: /* + difference in years * 365 */
830: + (long)(ay-by) * 365
831: );
832: return (60*(60*(24*days + (a->tm_hour - b->tm_hour))
833: + (a->tm_min - b->tm_min))
834: + (a->tm_sec - b->tm_sec));
835: }
836:
837: time_t
838: get_date(char *p)
839: {
840: struct tm *tm, *gmt, gmtbuf;
841: time_t Start;
842: time_t tod;
843: time_t now;
844: time_t timezone;
845:
846: yyInput = p;
847: (void)time (&now);
848:
849: gmt = gmtime (&now);
850: if (gmt != NULL)
851: {
852: /* Make a copy, in case localtime modifies *tm (I think
853: that comment now applies to *gmt, but I am too
854: lazy to dig into how gmtime and locatime allocate the
855: structures they return pointers to). */
856: gmtbuf = *gmt;
857: gmt = &gmtbuf;
858: }
859:
860: if (! (tm = localtime (&now)))
861: return -1;
862:
863: if (gmt != NULL)
864: timezone = difftm (gmt, tm) / 60;
865: else
866: /* We are on a system like VMS, where the system clock is
867: in local time and the system has no concept of timezones.
868: Hopefully we can fake this out (for the case in which the
869: user specifies no timezone) by just saying the timezone
870: is zero. */
871: timezone = 0;
872:
873: if(tm->tm_isdst)
874: timezone += 60;
875:
876: yyYear = tm->tm_year + 1900;
877: yyMonth = tm->tm_mon + 1;
878: yyDay = tm->tm_mday;
879: yyTimezone = timezone;
880: yyDSTmode = DSTmaybe;
881: yyHour = 0;
882: yyMinutes = 0;
883: yySeconds = 0;
884: yyMeridian = MER24;
885: yyRelSeconds = 0;
886: yyRelMonth = 0;
887: yyHaveDate = 0;
888: yyHaveDay = 0;
889: yyHaveRel = 0;
890: yyHaveTime = 0;
891: yyHaveZone = 0;
892:
893: if (yyparse()
894: || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1)
895: return -1;
896:
897: if (yyHaveDate || yyHaveTime || yyHaveDay) {
898: Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds,
899: yyMeridian, yyDSTmode);
900: if (Start < 0)
901: return -1;
902: }
903: else {
904: Start = now;
905: if (!yyHaveRel)
906: Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
907: }
908:
909: Start += yyRelSeconds;
910: Start += RelativeMonth(Start, yyRelMonth);
911:
912: if (yyHaveDay && !yyHaveDate) {
913: tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
914: Start += tod;
915: }
916:
917: /* Have to do *something* with a legitimate -1 so it's distinguishable
918: * from the error return value. (Alternately could set errno on error.) */
919: return Start == -1 ? 0 : Start;
920: }
921:
922:
923: #ifdef TEST
924:
925: /* ARGSUSED */
926: int
927: main(int argc, char *argv[])
928: {
929: char buff[128];
930: time_t d;
931:
932: (void)printf("Enter date, or blank line to exit.\n\t> ");
933: (void)fflush(stdout);
934: while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
935: d = get_date(buff);
936: if (d == -1)
937: (void)printf("Bad format - couldn't convert.\n");
938: else
939: (void)printf("%s", ctime(&d));
940: (void)printf("\t> ");
941: (void)fflush(stdout);
942: }
943: exit(0);
944: /* NOTREACHED */
945: }
946: #endif /* TEST */
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