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1.1 joris 1: %{
1.10 ! ray 2: /* $OpenBSD: date.y,v 1.9 2010/07/29 18:52:45 ray Exp $ */
1.1 joris 3:
4: /*
5: ** Originally written by Steven M. Bellovin <smb@research.att.com> while
6: ** at the University of North Carolina at Chapel Hill. Later tweaked by
7: ** a couple of people on Usenet. Completely overhauled by Rich $alz
8: ** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990;
9: **
10: ** This grammar has 10 shift/reduce conflicts.
11: **
12: ** This code is in the public domain and has no copyright.
13: */
14: /* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */
15: /* SUPPRESS 288 on yyerrlab *//* Label unused */
16:
1.6 xsa 17: #include <sys/timeb.h>
18:
19: #include <ctype.h>
20: #include <err.h>
21: #include <string.h>
1.1 joris 22:
23: #include "rcsprog.h"
24:
25: #define YEAR_EPOCH 1970
26: #define YEAR_TMORIGIN 1900
27: #define HOUR(x) ((time_t)(x) * 60)
28: #define SECSPERDAY (24L * 60L * 60L)
29:
30:
31: /* An entry in the lexical lookup table */
32: typedef struct _TABLE {
33: char *name;
34: int type;
35: time_t value;
36: } TABLE;
37:
38:
39: /* Daylight-savings mode: on, off, or not yet known. */
40: typedef enum _DSTMODE {
41: DSTon, DSToff, DSTmaybe
42: } DSTMODE;
43:
44: /* Meridian: am, pm, or 24-hour style. */
45: typedef enum _MERIDIAN {
46: MERam, MERpm, MER24
47: } MERIDIAN;
48:
49:
50: /*
51: * Global variables. We could get rid of most of these by using a good
52: * union as the yacc stack. (This routine was originally written before
53: * yacc had the %union construct.) Maybe someday; right now we only use
54: * the %union very rarely.
55: */
56: static const char *yyInput;
57: static DSTMODE yyDSTmode;
58: static time_t yyDayOrdinal;
59: static time_t yyDayNumber;
60: static int yyHaveDate;
61: static int yyHaveDay;
62: static int yyHaveRel;
63: static int yyHaveTime;
64: static int yyHaveZone;
65: static time_t yyTimezone;
66: static time_t yyDay;
67: static time_t yyHour;
68: static time_t yyMinutes;
69: static time_t yyMonth;
70: static time_t yySeconds;
71: static time_t yyYear;
72: static MERIDIAN yyMeridian;
73: static time_t yyRelMonth;
74: static time_t yyRelSeconds;
75:
76:
1.4 xsa 77: static int yyerror(const char *);
78: static int yylex(void);
79: static int yyparse(void);
80: static int lookup(char *);
1.1 joris 81:
82: %}
83:
84: %union {
85: time_t Number;
86: enum _MERIDIAN Meridian;
87: }
88:
89: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
90: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
91:
92: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
93: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
94: %type <Meridian> tMERIDIAN o_merid
95:
96: %%
97:
98: spec : /* NULL */
99: | spec item
100: ;
101:
102: item : time {
103: yyHaveTime++;
104: }
105: | zone {
106: yyHaveZone++;
107: }
108: | date {
109: yyHaveDate++;
110: }
111: | day {
112: yyHaveDay++;
113: }
114: | rel {
115: yyHaveRel++;
116: }
117: | number
118: ;
119:
120: time : tUNUMBER tMERIDIAN {
121: yyHour = $1;
122: yyMinutes = 0;
123: yySeconds = 0;
124: yyMeridian = $2;
125: }
126: | tUNUMBER ':' tUNUMBER o_merid {
127: yyHour = $1;
128: yyMinutes = $3;
129: yySeconds = 0;
130: yyMeridian = $4;
131: }
132: | tUNUMBER ':' tUNUMBER tSNUMBER {
133: yyHour = $1;
134: yyMinutes = $3;
135: yyMeridian = MER24;
136: yyDSTmode = DSToff;
137: yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
138: }
139: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
140: yyHour = $1;
141: yyMinutes = $3;
142: yySeconds = $5;
143: yyMeridian = $6;
144: }
145: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
146: yyHour = $1;
147: yyMinutes = $3;
148: yySeconds = $5;
149: yyMeridian = MER24;
150: yyDSTmode = DSToff;
151: yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
152: }
153: ;
154:
155: zone : tZONE {
156: yyTimezone = $1;
157: yyDSTmode = DSToff;
158: }
159: | tDAYZONE {
160: yyTimezone = $1;
161: yyDSTmode = DSTon;
162: }
163: | tZONE tDST {
164: yyTimezone = $1;
165: yyDSTmode = DSTon;
166: }
167: ;
168:
169: day : tDAY {
170: yyDayOrdinal = 1;
171: yyDayNumber = $1;
172: }
173: | tDAY ',' {
174: yyDayOrdinal = 1;
175: yyDayNumber = $1;
176: }
177: | tUNUMBER tDAY {
178: yyDayOrdinal = $1;
179: yyDayNumber = $2;
180: }
181: ;
182:
183: date : tUNUMBER '/' tUNUMBER {
184: yyMonth = $1;
185: yyDay = $3;
186: }
187: | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
188: if ($1 >= 100) {
189: yyYear = $1;
190: yyMonth = $3;
191: yyDay = $5;
192: } else {
193: yyMonth = $1;
194: yyDay = $3;
195: yyYear = $5;
196: }
197: }
198: | tUNUMBER tSNUMBER tSNUMBER {
199: /* ISO 8601 format. yyyy-mm-dd. */
200: yyYear = $1;
201: yyMonth = -$2;
202: yyDay = -$3;
203: }
204: | tUNUMBER tMONTH tSNUMBER {
205: /* e.g. 17-JUN-1992. */
206: yyDay = $1;
207: yyMonth = $2;
208: yyYear = -$3;
209: }
210: | tMONTH tUNUMBER {
211: yyMonth = $1;
212: yyDay = $2;
213: }
214: | tMONTH tUNUMBER ',' tUNUMBER {
215: yyMonth = $1;
216: yyDay = $2;
217: yyYear = $4;
218: }
219: | tUNUMBER tMONTH {
220: yyMonth = $2;
221: yyDay = $1;
222: }
223: | tUNUMBER tMONTH tUNUMBER {
224: yyMonth = $2;
225: yyDay = $1;
226: yyYear = $3;
227: }
228: ;
229:
230: rel : relunit tAGO {
231: yyRelSeconds = -yyRelSeconds;
232: yyRelMonth = -yyRelMonth;
233: }
234: | relunit
235: ;
236:
237: relunit : tUNUMBER tMINUTE_UNIT {
238: yyRelSeconds += $1 * $2 * 60L;
239: }
240: | tSNUMBER tMINUTE_UNIT {
241: yyRelSeconds += $1 * $2 * 60L;
242: }
243: | tMINUTE_UNIT {
244: yyRelSeconds += $1 * 60L;
245: }
246: | tSNUMBER tSEC_UNIT {
247: yyRelSeconds += $1;
248: }
249: | tUNUMBER tSEC_UNIT {
250: yyRelSeconds += $1;
251: }
252: | tSEC_UNIT {
253: yyRelSeconds++;
254: }
255: | tSNUMBER tMONTH_UNIT {
256: yyRelMonth += $1 * $2;
257: }
258: | tUNUMBER tMONTH_UNIT {
259: yyRelMonth += $1 * $2;
260: }
261: | tMONTH_UNIT {
262: yyRelMonth += $1;
263: }
264: ;
265:
266: number : tUNUMBER {
267: if (yyHaveTime && yyHaveDate && !yyHaveRel)
268: yyYear = $1;
269: else {
270: if ($1 > 10000) {
271: yyHaveDate++;
272: yyDay= ($1)%100;
273: yyMonth= ($1/100)%100;
274: yyYear = $1/10000;
275: } else {
276: yyHaveTime++;
277: if ($1 < 100) {
278: yyHour = $1;
279: yyMinutes = 0;
280: } else {
281: yyHour = $1 / 100;
282: yyMinutes = $1 % 100;
283: }
284: yySeconds = 0;
285: yyMeridian = MER24;
286: }
287: }
288: }
289: ;
290:
291: o_merid : /* NULL */ {
292: $$ = MER24;
293: }
294: | tMERIDIAN {
295: $$ = $1;
296: }
297: ;
298:
299: %%
300:
301: /* Month and day table. */
302: static TABLE const MonthDayTable[] = {
303: { "january", tMONTH, 1 },
304: { "february", tMONTH, 2 },
305: { "march", tMONTH, 3 },
306: { "april", tMONTH, 4 },
307: { "may", tMONTH, 5 },
308: { "june", tMONTH, 6 },
309: { "july", tMONTH, 7 },
310: { "august", tMONTH, 8 },
311: { "september", tMONTH, 9 },
312: { "sept", tMONTH, 9 },
313: { "october", tMONTH, 10 },
314: { "november", tMONTH, 11 },
315: { "december", tMONTH, 12 },
316: { "sunday", tDAY, 0 },
317: { "monday", tDAY, 1 },
318: { "tuesday", tDAY, 2 },
319: { "tues", tDAY, 2 },
320: { "wednesday", tDAY, 3 },
321: { "wednes", tDAY, 3 },
322: { "thursday", tDAY, 4 },
323: { "thur", tDAY, 4 },
324: { "thurs", tDAY, 4 },
325: { "friday", tDAY, 5 },
326: { "saturday", tDAY, 6 },
327: { NULL }
328: };
329:
330: /* Time units table. */
331: static TABLE const UnitsTable[] = {
332: { "year", tMONTH_UNIT, 12 },
333: { "month", tMONTH_UNIT, 1 },
334: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
335: { "week", tMINUTE_UNIT, 7 * 24 * 60 },
336: { "day", tMINUTE_UNIT, 1 * 24 * 60 },
337: { "hour", tMINUTE_UNIT, 60 },
338: { "minute", tMINUTE_UNIT, 1 },
339: { "min", tMINUTE_UNIT, 1 },
340: { "second", tSEC_UNIT, 1 },
341: { "sec", tSEC_UNIT, 1 },
342: { NULL }
343: };
344:
345: /* Assorted relative-time words. */
346: static TABLE const OtherTable[] = {
347: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
348: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
349: { "today", tMINUTE_UNIT, 0 },
350: { "now", tMINUTE_UNIT, 0 },
351: { "last", tUNUMBER, -1 },
352: { "this", tMINUTE_UNIT, 0 },
353: { "next", tUNUMBER, 2 },
354: { "first", tUNUMBER, 1 },
355: /* { "second", tUNUMBER, 2 }, */
356: { "third", tUNUMBER, 3 },
357: { "fourth", tUNUMBER, 4 },
358: { "fifth", tUNUMBER, 5 },
359: { "sixth", tUNUMBER, 6 },
360: { "seventh", tUNUMBER, 7 },
361: { "eighth", tUNUMBER, 8 },
362: { "ninth", tUNUMBER, 9 },
363: { "tenth", tUNUMBER, 10 },
364: { "eleventh", tUNUMBER, 11 },
365: { "twelfth", tUNUMBER, 12 },
366: { "ago", tAGO, 1 },
367: { NULL }
368: };
369:
370: /* The timezone table. */
371: /* Some of these are commented out because a time_t can't store a float. */
372: static TABLE const TimezoneTable[] = {
373: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
374: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
375: { "utc", tZONE, HOUR( 0) },
376: { "wet", tZONE, HOUR( 0) }, /* Western European */
377: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
378: { "wat", tZONE, HOUR( 1) }, /* West Africa */
379: { "at", tZONE, HOUR( 2) }, /* Azores */
380: #if 0
381: /* For completeness. BST is also British Summer, and GST is
382: * also Guam Standard. */
383: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
384: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
385: #endif
386: #if 0
387: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
388: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
389: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
390: #endif
391: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
392: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
393: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
394: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
395: { "cst", tZONE, HOUR( 6) }, /* Central Standard */
396: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
397: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
398: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
399: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
400: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
401: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
402: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
403: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
404: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
405: { "cat", tZONE, HOUR(10) }, /* Central Alaska */
406: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
407: { "nt", tZONE, HOUR(11) }, /* Nome */
408: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
409: { "cet", tZONE, -HOUR(1) }, /* Central European */
410: { "met", tZONE, -HOUR(1) }, /* Middle European */
411: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
412: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
413: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
414: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
415: { "fwt", tZONE, -HOUR(1) }, /* French Winter */
416: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
417: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
418: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
419: #if 0
420: { "it", tZONE, -HOUR(3.5) },/* Iran */
421: #endif
422: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
423: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
424: #if 0
425: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
426: #endif
427: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
428: #if 0
429: /* For completeness. NST is also Newfoundland Stanard, and SST is
430: * also Swedish Summer. */
431: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
432: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
433: #endif /* 0 */
434: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
435: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
436: #if 0
437: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
438: #endif
439: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
440: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
441: #if 0
442: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
443: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
444: #endif
445: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
446: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
447: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
448: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
449: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
450: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
451: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
452: { NULL }
453: };
454:
455: /* Military timezone table. */
456: static TABLE const MilitaryTable[] = {
457: { "a", tZONE, HOUR( 1) },
458: { "b", tZONE, HOUR( 2) },
459: { "c", tZONE, HOUR( 3) },
460: { "d", tZONE, HOUR( 4) },
461: { "e", tZONE, HOUR( 5) },
462: { "f", tZONE, HOUR( 6) },
463: { "g", tZONE, HOUR( 7) },
464: { "h", tZONE, HOUR( 8) },
465: { "i", tZONE, HOUR( 9) },
466: { "k", tZONE, HOUR( 10) },
467: { "l", tZONE, HOUR( 11) },
468: { "m", tZONE, HOUR( 12) },
469: { "n", tZONE, HOUR(- 1) },
470: { "o", tZONE, HOUR(- 2) },
471: { "p", tZONE, HOUR(- 3) },
472: { "q", tZONE, HOUR(- 4) },
473: { "r", tZONE, HOUR(- 5) },
474: { "s", tZONE, HOUR(- 6) },
475: { "t", tZONE, HOUR(- 7) },
476: { "u", tZONE, HOUR(- 8) },
477: { "v", tZONE, HOUR(- 9) },
478: { "w", tZONE, HOUR(-10) },
479: { "x", tZONE, HOUR(-11) },
480: { "y", tZONE, HOUR(-12) },
481: { "z", tZONE, HOUR( 0) },
482: { NULL }
483: };
484:
485:
486: static int
487: yyerror(const char *s)
488: {
489: char *str;
490:
491: if (isspace(yyInput[0]) || !isprint(yyInput[0]))
1.4 xsa 492: (void)xasprintf(&str,
493: "%s: unexpected char 0x%02x in date string", s, yyInput[0]);
1.1 joris 494: else
1.3 ray 495: (void)xasprintf(&str, "%s: unexpected %s in date string",
1.1 joris 496: s, yyInput);
497:
498: warnx("%s", str);
1.3 ray 499: xfree(str);
1.1 joris 500: return (0);
501: }
502:
503:
504: static time_t
505: ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
506: {
507: if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
508: return (-1);
509:
510: switch (Meridian) {
511: case MER24:
512: if (Hours < 0 || Hours > 23)
513: return (-1);
514: return (Hours * 60L + Minutes) * 60L + Seconds;
515: case MERam:
516: if (Hours < 1 || Hours > 12)
517: return (-1);
518: if (Hours == 12)
519: Hours = 0;
520: return (Hours * 60L + Minutes) * 60L + Seconds;
521: case MERpm:
522: if (Hours < 1 || Hours > 12)
523: return (-1);
524: if (Hours == 12)
525: Hours = 0;
526: return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
527: default:
1.9 ray 528: return (-1);
1.1 joris 529: }
530: /* NOTREACHED */
531: }
532:
533:
534: /* Year is either
535: * A negative number, which means to use its absolute value (why?)
536: * A number from 0 to 99, which means a year from 1900 to 1999, or
537: * The actual year (>=100).
538: */
539: static time_t
540: Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes,
541: time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode)
542: {
543: static int DaysInMonth[12] = {
544: 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
545: };
546: time_t tod;
547: time_t julian;
548: int i;
549:
550: if (Year < 0)
551: Year = -Year;
552: if (Year < 69)
553: Year += 2000;
554: else if (Year < 100) {
555: Year += 1900;
556: if (Year < YEAR_EPOCH)
557: Year += 100;
558: }
559: DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
560: ? 29 : 28;
561: /* Checking for 2038 bogusly assumes that time_t is 32 bits. But
562: I'm too lazy to try to check for time_t overflow in another way. */
563: if (Year < YEAR_EPOCH || Year > 2038 || Month < 1 || Month > 12 ||
564: /* Lint fluff: "conversion from long may lose accuracy" */
565: Day < 1 || Day > DaysInMonth[(int)--Month])
566: return (-1);
567:
568: for (julian = Day - 1, i = 0; i < Month; i++)
569: julian += DaysInMonth[i];
570:
571: for (i = YEAR_EPOCH; i < Year; i++)
572: julian += 365 + (i % 4 == 0);
573: julian *= SECSPERDAY;
574: julian += yyTimezone * 60L;
575:
576: if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
577: return (-1);
578: julian += tod;
579: if ((DSTmode == DSTon) ||
580: (DSTmode == DSTmaybe && localtime(&julian)->tm_isdst))
581: julian -= 60 * 60;
582: return (julian);
583: }
584:
585:
586: static time_t
587: DSTcorrect(time_t Start, time_t Future)
588: {
589: time_t StartDay;
590: time_t FutureDay;
591:
592: StartDay = (localtime(&Start)->tm_hour + 1) % 24;
593: FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
594: return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
595: }
596:
597:
598: static time_t
599: RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber)
600: {
601: struct tm *tm;
602: time_t now;
603:
604: now = Start;
605: tm = localtime(&now);
606: now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
607: now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
608: return DSTcorrect(Start, now);
609: }
610:
611:
612: static time_t
613: RelativeMonth(time_t Start, time_t RelMonth)
614: {
615: struct tm *tm;
616: time_t Month;
617: time_t Year;
618:
619: if (RelMonth == 0)
620: return (0);
621: tm = localtime(&Start);
622: Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth;
623: Year = Month / 12;
624: Month = Month % 12 + 1;
625: return DSTcorrect(Start,
626: Convert(Month, (time_t)tm->tm_mday, Year,
627: (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
628: MER24, DSTmaybe));
629: }
630:
631:
632: static int
633: lookup(char *buff)
634: {
1.5 ray 635: size_t len;
1.1 joris 636: char *p, *q;
637: int i, abbrev;
638: const TABLE *tp;
639:
640: /* Make it lowercase. */
641: for (p = buff; *p; p++)
642: if (isupper(*p))
643: *p = tolower(*p);
644:
645: if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
646: yylval.Meridian = MERam;
647: return (tMERIDIAN);
648: }
649: if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
650: yylval.Meridian = MERpm;
651: return (tMERIDIAN);
652: }
653:
1.5 ray 654: len = strlen(buff);
1.1 joris 655: /* See if we have an abbreviation for a month. */
1.5 ray 656: if (len == 3)
1.1 joris 657: abbrev = 1;
1.5 ray 658: else if (len == 4 && buff[3] == '.') {
1.1 joris 659: abbrev = 1;
660: buff[3] = '\0';
1.5 ray 661: --len;
1.1 joris 662: } else
663: abbrev = 0;
664:
665: for (tp = MonthDayTable; tp->name; tp++) {
666: if (abbrev) {
667: if (strncmp(buff, tp->name, 3) == 0) {
668: yylval.Number = tp->value;
669: return (tp->type);
670: }
671: } else if (strcmp(buff, tp->name) == 0) {
672: yylval.Number = tp->value;
673: return (tp->type);
674: }
675: }
676:
677: for (tp = TimezoneTable; tp->name; tp++)
678: if (strcmp(buff, tp->name) == 0) {
679: yylval.Number = tp->value;
680: return (tp->type);
681: }
682:
683: if (strcmp(buff, "dst") == 0)
684: return (tDST);
685:
686: for (tp = UnitsTable; tp->name; tp++)
687: if (strcmp(buff, tp->name) == 0) {
688: yylval.Number = tp->value;
689: return (tp->type);
690: }
691:
692: /* Strip off any plural and try the units table again. */
1.5 ray 693: if (len != 0 && buff[len - 1] == 's') {
694: buff[len - 1] = '\0';
1.1 joris 695: for (tp = UnitsTable; tp->name; tp++)
696: if (strcmp(buff, tp->name) == 0) {
697: yylval.Number = tp->value;
698: return (tp->type);
699: }
1.5 ray 700: buff[len - 1] = 's'; /* Put back for "this" in OtherTable. */
1.1 joris 701: }
702:
703: for (tp = OtherTable; tp->name; tp++)
704: if (strcmp(buff, tp->name) == 0) {
705: yylval.Number = tp->value;
706: return (tp->type);
707: }
708:
709: /* Military timezones. */
1.5 ray 710: if (len == 1 && isalpha(*buff)) {
1.1 joris 711: for (tp = MilitaryTable; tp->name; tp++)
712: if (strcmp(buff, tp->name) == 0) {
713: yylval.Number = tp->value;
714: return (tp->type);
715: }
716: }
717:
718: /* Drop out any periods and try the timezone table again. */
719: for (i = 0, p = q = buff; *q; q++)
720: if (*q != '.')
721: *p++ = *q;
722: else
723: i++;
724: *p = '\0';
725: if (i)
726: for (tp = TimezoneTable; tp->name; tp++)
727: if (strcmp(buff, tp->name) == 0) {
728: yylval.Number = tp->value;
729: return (tp->type);
730: }
731:
732: return (tID);
733: }
734:
735:
736: static int
737: yylex(void)
738: {
739: char c, *p, buff[20];
740: int count, sign;
741:
742: for (;;) {
743: while (isspace(*yyInput))
744: yyInput++;
745:
746: if (isdigit(c = *yyInput) || c == '-' || c == '+') {
747: if (c == '-' || c == '+') {
748: sign = c == '-' ? -1 : 1;
749: if (!isdigit(*++yyInput))
750: /* skip the '-' sign */
751: continue;
752: }
753: else
754: sign = 0;
755:
756: for (yylval.Number = 0; isdigit(c = *yyInput++); )
757: yylval.Number = 10 * yylval.Number + c - '0';
758: yyInput--;
759: if (sign < 0)
760: yylval.Number = -yylval.Number;
761: return sign ? tSNUMBER : tUNUMBER;
762: }
763:
764: if (isalpha(c)) {
765: for (p = buff; isalpha(c = *yyInput++) || c == '.'; )
766: if (p < &buff[sizeof buff - 1])
767: *p++ = c;
768: *p = '\0';
769: yyInput--;
770: return lookup(buff);
771: }
772: if (c != '(')
773: return *yyInput++;
774:
775: count = 0;
776: do {
777: c = *yyInput++;
778: if (c == '\0')
779: return (c);
780: if (c == '(')
781: count++;
782: else if (c == ')')
783: count--;
784: } while (count > 0);
785: }
786: }
787:
788: /* Yield A - B, measured in seconds. */
789: static long
790: difftm(struct tm *a, struct tm *b)
791: {
792: int ay = a->tm_year + (YEAR_TMORIGIN - 1);
793: int by = b->tm_year + (YEAR_TMORIGIN - 1);
794: int days = (
795: /* difference in day of year */
796: a->tm_yday - b->tm_yday
797: /* + intervening leap days */
798: + ((ay >> 2) - (by >> 2))
799: - (ay/100 - by/100)
800: + ((ay/100 >> 2) - (by/100 >> 2))
801: /* + difference in years * 365 */
802: + (long)(ay-by) * 365);
803: return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
804: + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec));
805: }
806:
807: /*
1.8 ray 808: * date_parse()
1.1 joris 809: *
810: * Returns the number of seconds since the Epoch corresponding to the date.
811: */
812: time_t
1.8 ray 813: date_parse(const char *p)
1.1 joris 814: {
1.7 ray 815: struct tm gmt, tm;
816: time_t Start, tod, nowtime, tz;
1.1 joris 817:
818: yyInput = p;
819:
1.7 ray 820: if (time(&nowtime) == -1 || !gmtime_r(&nowtime, &gmt) ||
821: !localtime_r(&nowtime, &tm))
1.9 ray 822: return -1;
1.7 ray 823:
824: tz = difftm(&gmt, &tm) / 60;
825:
826: if (tm.tm_isdst)
827: tz += 60;
828:
829: yyYear = tm.tm_year + 1900;
830: yyMonth = tm.tm_mon + 1;
831: yyDay = tm.tm_mday;
832: yyTimezone = tz;
1.1 joris 833: yyDSTmode = DSTmaybe;
834: yyHour = 0;
835: yyMinutes = 0;
836: yySeconds = 0;
837: yyMeridian = MER24;
838: yyRelSeconds = 0;
839: yyRelMonth = 0;
840: yyHaveDate = 0;
841: yyHaveDay = 0;
842: yyHaveRel = 0;
843: yyHaveTime = 0;
844: yyHaveZone = 0;
845:
846: if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 ||
847: yyHaveDate > 1 || yyHaveDay > 1)
848: return (-1);
849:
850: if (yyHaveDate || yyHaveTime || yyHaveDay) {
851: Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes,
852: yySeconds, yyMeridian, yyDSTmode);
853: if (Start < 0)
854: return (-1);
855: } else {
856: Start = nowtime;
857: if (!yyHaveRel)
1.7 ray 858: Start -= ((tm.tm_hour * 60L + tm.tm_min) * 60L) +
859: tm.tm_sec;
1.1 joris 860: }
861:
862: Start += yyRelSeconds;
863: Start += RelativeMonth(Start, yyRelMonth);
864:
865: if (yyHaveDay && !yyHaveDate) {
866: tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
867: Start += tod;
868: }
869:
1.10 ! ray 870: return Start;
1.1 joris 871: }
872:
873: #if defined(TEST)
874: /* ARGSUSED */
875: int
876: main(int argc, char **argv)
877: {
878: char buff[128];
879: time_t d;
880:
881: (void)printf("Enter date, or blank line to exit.\n\t> ");
882: (void)fflush(stdout);
883: while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
1.8 ray 884: d = date_parse(buff);
1.1 joris 885: if (d == -1)
886: (void)printf("Bad format - couldn't convert.\n");
887: else
888: (void)printf("%s", ctime(&d));
889: (void)printf("\t> ");
890: (void)fflush(stdout);
891: }
892:
893: return (0);
894: }
895: #endif /* defined(TEST) */