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1.1 joris 1: %{
1.3 ! ray 2: /* $OpenBSD: date.y,v 1.2 2006/04/29 04:42:47 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:
17: #include "includes.h"
18:
19: #include "rcsprog.h"
20:
21: #define YEAR_EPOCH 1970
22: #define YEAR_TMORIGIN 1900
23: #define HOUR(x) ((time_t)(x) * 60)
24: #define SECSPERDAY (24L * 60L * 60L)
25:
26:
27: /* An entry in the lexical lookup table */
28: typedef struct _TABLE {
29: char *name;
30: int type;
31: time_t value;
32: } TABLE;
33:
34:
35: /* Daylight-savings mode: on, off, or not yet known. */
36: typedef enum _DSTMODE {
37: DSTon, DSToff, DSTmaybe
38: } DSTMODE;
39:
40: /* Meridian: am, pm, or 24-hour style. */
41: typedef enum _MERIDIAN {
42: MERam, MERpm, MER24
43: } MERIDIAN;
44:
45:
46: /*
47: * Global variables. We could get rid of most of these by using a good
48: * union as the yacc stack. (This routine was originally written before
49: * yacc had the %union construct.) Maybe someday; right now we only use
50: * the %union very rarely.
51: */
52: static const char *yyInput;
53: static DSTMODE yyDSTmode;
54: static time_t yyDayOrdinal;
55: static time_t yyDayNumber;
56: static int yyHaveDate;
57: static int yyHaveDay;
58: static int yyHaveRel;
59: static int yyHaveTime;
60: static int yyHaveZone;
61: static time_t yyTimezone;
62: static time_t yyDay;
63: static time_t yyHour;
64: static time_t yyMinutes;
65: static time_t yyMonth;
66: static time_t yySeconds;
67: static time_t yyYear;
68: static MERIDIAN yyMeridian;
69: static time_t yyRelMonth;
70: static time_t yyRelSeconds;
71:
72:
73: static int yyerror (const char *);
74: static int yylex (void);
75: static int yyparse (void);
76: static int lookup (char *);
77:
78: %}
79:
80: %union {
81: time_t Number;
82: enum _MERIDIAN Meridian;
83: }
84:
85: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
86: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
87:
88: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
89: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
90: %type <Meridian> tMERIDIAN o_merid
91:
92: %%
93:
94: spec : /* NULL */
95: | spec item
96: ;
97:
98: item : time {
99: yyHaveTime++;
100: }
101: | zone {
102: yyHaveZone++;
103: }
104: | date {
105: yyHaveDate++;
106: }
107: | day {
108: yyHaveDay++;
109: }
110: | rel {
111: yyHaveRel++;
112: }
113: | number
114: ;
115:
116: time : tUNUMBER tMERIDIAN {
117: yyHour = $1;
118: yyMinutes = 0;
119: yySeconds = 0;
120: yyMeridian = $2;
121: }
122: | tUNUMBER ':' tUNUMBER o_merid {
123: yyHour = $1;
124: yyMinutes = $3;
125: yySeconds = 0;
126: yyMeridian = $4;
127: }
128: | tUNUMBER ':' tUNUMBER tSNUMBER {
129: yyHour = $1;
130: yyMinutes = $3;
131: yyMeridian = MER24;
132: yyDSTmode = DSToff;
133: yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
134: }
135: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
136: yyHour = $1;
137: yyMinutes = $3;
138: yySeconds = $5;
139: yyMeridian = $6;
140: }
141: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
142: yyHour = $1;
143: yyMinutes = $3;
144: yySeconds = $5;
145: yyMeridian = MER24;
146: yyDSTmode = DSToff;
147: yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
148: }
149: ;
150:
151: zone : tZONE {
152: yyTimezone = $1;
153: yyDSTmode = DSToff;
154: }
155: | tDAYZONE {
156: yyTimezone = $1;
157: yyDSTmode = DSTon;
158: }
159: | tZONE tDST {
160: yyTimezone = $1;
161: yyDSTmode = DSTon;
162: }
163: ;
164:
165: day : tDAY {
166: yyDayOrdinal = 1;
167: yyDayNumber = $1;
168: }
169: | tDAY ',' {
170: yyDayOrdinal = 1;
171: yyDayNumber = $1;
172: }
173: | tUNUMBER tDAY {
174: yyDayOrdinal = $1;
175: yyDayNumber = $2;
176: }
177: ;
178:
179: date : tUNUMBER '/' tUNUMBER {
180: yyMonth = $1;
181: yyDay = $3;
182: }
183: | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
184: if ($1 >= 100) {
185: yyYear = $1;
186: yyMonth = $3;
187: yyDay = $5;
188: } else {
189: yyMonth = $1;
190: yyDay = $3;
191: yyYear = $5;
192: }
193: }
194: | tUNUMBER tSNUMBER tSNUMBER {
195: /* ISO 8601 format. yyyy-mm-dd. */
196: yyYear = $1;
197: yyMonth = -$2;
198: yyDay = -$3;
199: }
200: | tUNUMBER tMONTH tSNUMBER {
201: /* e.g. 17-JUN-1992. */
202: yyDay = $1;
203: yyMonth = $2;
204: yyYear = -$3;
205: }
206: | tMONTH tUNUMBER {
207: yyMonth = $1;
208: yyDay = $2;
209: }
210: | tMONTH tUNUMBER ',' tUNUMBER {
211: yyMonth = $1;
212: yyDay = $2;
213: yyYear = $4;
214: }
215: | tUNUMBER tMONTH {
216: yyMonth = $2;
217: yyDay = $1;
218: }
219: | tUNUMBER tMONTH tUNUMBER {
220: yyMonth = $2;
221: yyDay = $1;
222: yyYear = $3;
223: }
224: ;
225:
226: rel : relunit tAGO {
227: yyRelSeconds = -yyRelSeconds;
228: yyRelMonth = -yyRelMonth;
229: }
230: | relunit
231: ;
232:
233: relunit : tUNUMBER tMINUTE_UNIT {
234: yyRelSeconds += $1 * $2 * 60L;
235: }
236: | tSNUMBER tMINUTE_UNIT {
237: yyRelSeconds += $1 * $2 * 60L;
238: }
239: | tMINUTE_UNIT {
240: yyRelSeconds += $1 * 60L;
241: }
242: | tSNUMBER tSEC_UNIT {
243: yyRelSeconds += $1;
244: }
245: | tUNUMBER tSEC_UNIT {
246: yyRelSeconds += $1;
247: }
248: | tSEC_UNIT {
249: yyRelSeconds++;
250: }
251: | tSNUMBER tMONTH_UNIT {
252: yyRelMonth += $1 * $2;
253: }
254: | tUNUMBER tMONTH_UNIT {
255: yyRelMonth += $1 * $2;
256: }
257: | tMONTH_UNIT {
258: yyRelMonth += $1;
259: }
260: ;
261:
262: number : tUNUMBER {
263: if (yyHaveTime && yyHaveDate && !yyHaveRel)
264: yyYear = $1;
265: else {
266: if ($1 > 10000) {
267: yyHaveDate++;
268: yyDay= ($1)%100;
269: yyMonth= ($1/100)%100;
270: yyYear = $1/10000;
271: } else {
272: yyHaveTime++;
273: if ($1 < 100) {
274: yyHour = $1;
275: yyMinutes = 0;
276: } else {
277: yyHour = $1 / 100;
278: yyMinutes = $1 % 100;
279: }
280: yySeconds = 0;
281: yyMeridian = MER24;
282: }
283: }
284: }
285: ;
286:
287: o_merid : /* NULL */ {
288: $$ = MER24;
289: }
290: | tMERIDIAN {
291: $$ = $1;
292: }
293: ;
294:
295: %%
296:
297: /* Month and day table. */
298: static TABLE const MonthDayTable[] = {
299: { "january", tMONTH, 1 },
300: { "february", tMONTH, 2 },
301: { "march", tMONTH, 3 },
302: { "april", tMONTH, 4 },
303: { "may", tMONTH, 5 },
304: { "june", tMONTH, 6 },
305: { "july", tMONTH, 7 },
306: { "august", tMONTH, 8 },
307: { "september", tMONTH, 9 },
308: { "sept", tMONTH, 9 },
309: { "october", tMONTH, 10 },
310: { "november", tMONTH, 11 },
311: { "december", tMONTH, 12 },
312: { "sunday", tDAY, 0 },
313: { "monday", tDAY, 1 },
314: { "tuesday", tDAY, 2 },
315: { "tues", tDAY, 2 },
316: { "wednesday", tDAY, 3 },
317: { "wednes", tDAY, 3 },
318: { "thursday", tDAY, 4 },
319: { "thur", tDAY, 4 },
320: { "thurs", tDAY, 4 },
321: { "friday", tDAY, 5 },
322: { "saturday", tDAY, 6 },
323: { NULL }
324: };
325:
326: /* Time units table. */
327: static TABLE const UnitsTable[] = {
328: { "year", tMONTH_UNIT, 12 },
329: { "month", tMONTH_UNIT, 1 },
330: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
331: { "week", tMINUTE_UNIT, 7 * 24 * 60 },
332: { "day", tMINUTE_UNIT, 1 * 24 * 60 },
333: { "hour", tMINUTE_UNIT, 60 },
334: { "minute", tMINUTE_UNIT, 1 },
335: { "min", tMINUTE_UNIT, 1 },
336: { "second", tSEC_UNIT, 1 },
337: { "sec", tSEC_UNIT, 1 },
338: { NULL }
339: };
340:
341: /* Assorted relative-time words. */
342: static TABLE const OtherTable[] = {
343: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
344: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
345: { "today", tMINUTE_UNIT, 0 },
346: { "now", tMINUTE_UNIT, 0 },
347: { "last", tUNUMBER, -1 },
348: { "this", tMINUTE_UNIT, 0 },
349: { "next", tUNUMBER, 2 },
350: { "first", tUNUMBER, 1 },
351: /* { "second", tUNUMBER, 2 }, */
352: { "third", tUNUMBER, 3 },
353: { "fourth", tUNUMBER, 4 },
354: { "fifth", tUNUMBER, 5 },
355: { "sixth", tUNUMBER, 6 },
356: { "seventh", tUNUMBER, 7 },
357: { "eighth", tUNUMBER, 8 },
358: { "ninth", tUNUMBER, 9 },
359: { "tenth", tUNUMBER, 10 },
360: { "eleventh", tUNUMBER, 11 },
361: { "twelfth", tUNUMBER, 12 },
362: { "ago", tAGO, 1 },
363: { NULL }
364: };
365:
366: /* The timezone table. */
367: /* Some of these are commented out because a time_t can't store a float. */
368: static TABLE const TimezoneTable[] = {
369: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
370: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
371: { "utc", tZONE, HOUR( 0) },
372: { "wet", tZONE, HOUR( 0) }, /* Western European */
373: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
374: { "wat", tZONE, HOUR( 1) }, /* West Africa */
375: { "at", tZONE, HOUR( 2) }, /* Azores */
376: #if 0
377: /* For completeness. BST is also British Summer, and GST is
378: * also Guam Standard. */
379: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
380: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
381: #endif
382: #if 0
383: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
384: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
385: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
386: #endif
387: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
388: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
389: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
390: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
391: { "cst", tZONE, HOUR( 6) }, /* Central Standard */
392: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
393: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
394: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
395: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
396: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
397: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
398: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
399: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
400: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
401: { "cat", tZONE, HOUR(10) }, /* Central Alaska */
402: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
403: { "nt", tZONE, HOUR(11) }, /* Nome */
404: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
405: { "cet", tZONE, -HOUR(1) }, /* Central European */
406: { "met", tZONE, -HOUR(1) }, /* Middle European */
407: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
408: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
409: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
410: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
411: { "fwt", tZONE, -HOUR(1) }, /* French Winter */
412: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
413: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
414: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
415: #if 0
416: { "it", tZONE, -HOUR(3.5) },/* Iran */
417: #endif
418: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
419: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
420: #if 0
421: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
422: #endif
423: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
424: #if 0
425: /* For completeness. NST is also Newfoundland Stanard, and SST is
426: * also Swedish Summer. */
427: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
428: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
429: #endif /* 0 */
430: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
431: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
432: #if 0
433: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
434: #endif
435: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
436: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
437: #if 0
438: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
439: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
440: #endif
441: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
442: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
443: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
444: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
445: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
446: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
447: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
448: { NULL }
449: };
450:
451: /* Military timezone table. */
452: static TABLE const MilitaryTable[] = {
453: { "a", tZONE, HOUR( 1) },
454: { "b", tZONE, HOUR( 2) },
455: { "c", tZONE, HOUR( 3) },
456: { "d", tZONE, HOUR( 4) },
457: { "e", tZONE, HOUR( 5) },
458: { "f", tZONE, HOUR( 6) },
459: { "g", tZONE, HOUR( 7) },
460: { "h", tZONE, HOUR( 8) },
461: { "i", tZONE, HOUR( 9) },
462: { "k", tZONE, HOUR( 10) },
463: { "l", tZONE, HOUR( 11) },
464: { "m", tZONE, HOUR( 12) },
465: { "n", tZONE, HOUR(- 1) },
466: { "o", tZONE, HOUR(- 2) },
467: { "p", tZONE, HOUR(- 3) },
468: { "q", tZONE, HOUR(- 4) },
469: { "r", tZONE, HOUR(- 5) },
470: { "s", tZONE, HOUR(- 6) },
471: { "t", tZONE, HOUR(- 7) },
472: { "u", tZONE, HOUR(- 8) },
473: { "v", tZONE, HOUR(- 9) },
474: { "w", tZONE, HOUR(-10) },
475: { "x", tZONE, HOUR(-11) },
476: { "y", tZONE, HOUR(-12) },
477: { "z", tZONE, HOUR( 0) },
478: { NULL }
479: };
480:
481:
482: static int
483: yyerror(const char *s)
484: {
485: char *str;
486:
487: if (isspace(yyInput[0]) || !isprint(yyInput[0]))
1.3 ! ray 488: (void)xasprintf(&str, "%s: unexpected char 0x%02x in date string",
1.1 joris 489: s, yyInput[0]);
490: else
1.3 ! ray 491: (void)xasprintf(&str, "%s: unexpected %s in date string",
1.1 joris 492: s, yyInput);
493:
494: #if defined(TEST)
495: printf("%s", str);
496: #else
497: warnx("%s", str);
498: #endif
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:
528: abort();
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: {
635: char *p, *q;
636: int i, abbrev;
637: const TABLE *tp;
638:
639: /* Make it lowercase. */
640: for (p = buff; *p; p++)
641: if (isupper(*p))
642: *p = tolower(*p);
643:
644: if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
645: yylval.Meridian = MERam;
646: return (tMERIDIAN);
647: }
648: if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
649: yylval.Meridian = MERpm;
650: return (tMERIDIAN);
651: }
652:
653: /* See if we have an abbreviation for a month. */
654: if (strlen(buff) == 3)
655: abbrev = 1;
656: else if (strlen(buff) == 4 && buff[3] == '.') {
657: abbrev = 1;
658: buff[3] = '\0';
659: } else
660: abbrev = 0;
661:
662: for (tp = MonthDayTable; tp->name; tp++) {
663: if (abbrev) {
664: if (strncmp(buff, tp->name, 3) == 0) {
665: yylval.Number = tp->value;
666: return (tp->type);
667: }
668: } else if (strcmp(buff, tp->name) == 0) {
669: yylval.Number = tp->value;
670: return (tp->type);
671: }
672: }
673:
674: for (tp = TimezoneTable; tp->name; tp++)
675: if (strcmp(buff, tp->name) == 0) {
676: yylval.Number = tp->value;
677: return (tp->type);
678: }
679:
680: if (strcmp(buff, "dst") == 0)
681: return (tDST);
682:
683: for (tp = UnitsTable; tp->name; tp++)
684: if (strcmp(buff, tp->name) == 0) {
685: yylval.Number = tp->value;
686: return (tp->type);
687: }
688:
689: /* Strip off any plural and try the units table again. */
690: i = strlen(buff) - 1;
691: if (buff[i] == 's') {
692: buff[i] = '\0';
693: for (tp = UnitsTable; tp->name; tp++)
694: if (strcmp(buff, tp->name) == 0) {
695: yylval.Number = tp->value;
696: return (tp->type);
697: }
698: buff[i] = 's'; /* Put back for "this" in OtherTable. */
699: }
700:
701: for (tp = OtherTable; tp->name; tp++)
702: if (strcmp(buff, tp->name) == 0) {
703: yylval.Number = tp->value;
704: return (tp->type);
705: }
706:
707: /* Military timezones. */
708: if (buff[1] == '\0' && isalpha(*buff)) {
709: for (tp = MilitaryTable; tp->name; tp++)
710: if (strcmp(buff, tp->name) == 0) {
711: yylval.Number = tp->value;
712: return (tp->type);
713: }
714: }
715:
716: /* Drop out any periods and try the timezone table again. */
717: for (i = 0, p = q = buff; *q; q++)
718: if (*q != '.')
719: *p++ = *q;
720: else
721: i++;
722: *p = '\0';
723: if (i)
724: for (tp = TimezoneTable; tp->name; tp++)
725: if (strcmp(buff, tp->name) == 0) {
726: yylval.Number = tp->value;
727: return (tp->type);
728: }
729:
730: return (tID);
731: }
732:
733:
734: static int
735: yylex(void)
736: {
737: char c, *p, buff[20];
738: int count, sign;
739:
740: for (;;) {
741: while (isspace(*yyInput))
742: yyInput++;
743:
744: if (isdigit(c = *yyInput) || c == '-' || c == '+') {
745: if (c == '-' || c == '+') {
746: sign = c == '-' ? -1 : 1;
747: if (!isdigit(*++yyInput))
748: /* skip the '-' sign */
749: continue;
750: }
751: else
752: sign = 0;
753:
754: for (yylval.Number = 0; isdigit(c = *yyInput++); )
755: yylval.Number = 10 * yylval.Number + c - '0';
756: yyInput--;
757: if (sign < 0)
758: yylval.Number = -yylval.Number;
759: return sign ? tSNUMBER : tUNUMBER;
760: }
761:
762: if (isalpha(c)) {
763: for (p = buff; isalpha(c = *yyInput++) || c == '.'; )
764: if (p < &buff[sizeof buff - 1])
765: *p++ = c;
766: *p = '\0';
767: yyInput--;
768: return lookup(buff);
769: }
770: if (c != '(')
771: return *yyInput++;
772:
773: count = 0;
774: do {
775: c = *yyInput++;
776: if (c == '\0')
777: return (c);
778: if (c == '(')
779: count++;
780: else if (c == ')')
781: count--;
782: } while (count > 0);
783: }
784: }
785:
786: /* Yield A - B, measured in seconds. */
787: static long
788: difftm(struct tm *a, struct tm *b)
789: {
790: int ay = a->tm_year + (YEAR_TMORIGIN - 1);
791: int by = b->tm_year + (YEAR_TMORIGIN - 1);
792: int days = (
793: /* difference in day of year */
794: a->tm_yday - b->tm_yday
795: /* + intervening leap days */
796: + ((ay >> 2) - (by >> 2))
797: - (ay/100 - by/100)
798: + ((ay/100 >> 2) - (by/100 >> 2))
799: /* + difference in years * 365 */
800: + (long)(ay-by) * 365);
801: return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
802: + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec));
803: }
804:
805: /*
806: * rcs_date_parse()
807: *
808: * Returns the number of seconds since the Epoch corresponding to the date.
809: */
810: time_t
811: rcs_date_parse(const char *p)
812: {
1.2 ray 813: struct tm gmt, *gmt_ptr, *tm;
1.1 joris 814: struct timeb ftz, *now;
815: time_t Start, tod, nowtime;
816:
817: yyInput = p;
818:
1.2 ray 819: now = &ftz;
820: (void)time(&nowtime);
1.1 joris 821:
1.2 ray 822: gmt_ptr = gmtime(&nowtime);
823: if (gmt_ptr != NULL) {
824: /* Make a copy, in case localtime modifies *tm (I think
825: * that comment now applies to *gmt_ptr, but I am too
826: * lazy to dig into how gmtime and locatime allocate the
827: * structures they return pointers to).
828: */
829: gmt = *gmt_ptr;
830: }
1.1 joris 831:
1.2 ray 832: if (!(tm = localtime(&nowtime)))
833: return (-1);
1.1 joris 834:
1.2 ray 835: if (gmt_ptr != NULL)
836: ftz.timezone = difftm(&gmt, tm) / 60;
1.1 joris 837:
1.2 ray 838: if (tm->tm_isdst)
839: ftz.timezone += 60;
1.1 joris 840:
841: tm = localtime(&nowtime);
842: yyYear = tm->tm_year + 1900;
843: yyMonth = tm->tm_mon + 1;
844: yyDay = tm->tm_mday;
845: yyTimezone = now->timezone;
846: yyDSTmode = DSTmaybe;
847: yyHour = 0;
848: yyMinutes = 0;
849: yySeconds = 0;
850: yyMeridian = MER24;
851: yyRelSeconds = 0;
852: yyRelMonth = 0;
853: yyHaveDate = 0;
854: yyHaveDay = 0;
855: yyHaveRel = 0;
856: yyHaveTime = 0;
857: yyHaveZone = 0;
858:
859: if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 ||
860: yyHaveDate > 1 || yyHaveDay > 1)
861: return (-1);
862:
863: if (yyHaveDate || yyHaveTime || yyHaveDay) {
864: Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes,
865: yySeconds, yyMeridian, yyDSTmode);
866: if (Start < 0)
867: return (-1);
868: } else {
869: Start = nowtime;
870: if (!yyHaveRel)
871: Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) +
872: tm->tm_sec;
873: }
874:
875: Start += yyRelSeconds;
876: Start += RelativeMonth(Start, yyRelMonth);
877:
878: if (yyHaveDay && !yyHaveDate) {
879: tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
880: Start += tod;
881: }
882:
883: /* Have to do *something* with a legitimate -1 so it's distinguishable
884: * from the error return value. (Alternately could set errno on error.)
885: */
886: return (Start == -1) ? (0) : (Start);
887: }
888:
889: #if defined(TEST)
890: /* ARGSUSED */
891: int
892: main(int argc, char **argv)
893: {
894: char buff[128];
895: time_t d;
896:
897: (void)printf("Enter date, or blank line to exit.\n\t> ");
898: (void)fflush(stdout);
899: while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
900: d = rcs_date_parse(buff);
901: if (d == -1)
902: (void)printf("Bad format - couldn't convert.\n");
903: else
904: (void)printf("%s", ctime(&d));
905: (void)printf("\t> ");
906: (void)fflush(stdout);
907: }
908:
909: return (0);
910: }
911: #endif /* defined(TEST) */