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1.1 joris 1: %{
1.14 ! guenther 2: /* $OpenBSD: date.y,v 1.13 2015/06/13 20:15:21 nicm 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 */
1.6 xsa 16:
17: #include <ctype.h>
18: #include <err.h>
19: #include <string.h>
1.14 ! guenther 20: #include <time.h>
1.1 joris 21:
22: #include "rcsprog.h"
23:
24: #define YEAR_EPOCH 1970
25: #define YEAR_TMORIGIN 1900
26: #define HOUR(x) ((time_t)(x) * 60)
27: #define SECSPERDAY (24L * 60L * 60L)
28:
29:
30: /* An entry in the lexical lookup table */
31: typedef struct _TABLE {
32: char *name;
33: int type;
34: time_t value;
35: } TABLE;
36:
37:
38: /* Daylight-savings mode: on, off, or not yet known. */
39: typedef enum _DSTMODE {
40: DSTon, DSToff, DSTmaybe
41: } DSTMODE;
42:
43: /* Meridian: am, pm, or 24-hour style. */
44: typedef enum _MERIDIAN {
45: MERam, MERpm, MER24
46: } MERIDIAN;
47:
48:
49: /*
50: * Global variables. We could get rid of most of these by using a good
51: * union as the yacc stack. (This routine was originally written before
52: * yacc had the %union construct.) Maybe someday; right now we only use
53: * the %union very rarely.
54: */
55: static const char *yyInput;
56: static DSTMODE yyDSTmode;
57: static time_t yyDayOrdinal;
58: static time_t yyDayNumber;
59: static int yyHaveDate;
60: static int yyHaveDay;
61: static int yyHaveRel;
62: static int yyHaveTime;
63: static int yyHaveZone;
64: static time_t yyTimezone;
65: static time_t yyDay;
66: static time_t yyHour;
67: static time_t yyMinutes;
68: static time_t yyMonth;
69: static time_t yySeconds;
70: static time_t yyYear;
71: static MERIDIAN yyMeridian;
72: static time_t yyRelMonth;
73: static time_t yyRelSeconds;
74:
75:
1.4 xsa 76: static int yyerror(const char *);
77: static int yylex(void);
78: static int yyparse(void);
79: static int lookup(char *);
1.1 joris 80:
81: %}
82:
83: %union {
84: time_t Number;
85: enum _MERIDIAN Meridian;
86: }
87:
88: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
89: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
90:
91: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
92: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
93: %type <Meridian> tMERIDIAN o_merid
94:
95: %%
96:
97: spec : /* NULL */
98: | spec item
99: ;
100:
101: item : time {
102: yyHaveTime++;
103: }
104: | zone {
105: yyHaveZone++;
106: }
107: | date {
108: yyHaveDate++;
109: }
110: | day {
111: yyHaveDay++;
112: }
113: | rel {
114: yyHaveRel++;
115: }
116: | number
117: ;
118:
119: time : tUNUMBER tMERIDIAN {
120: yyHour = $1;
121: yyMinutes = 0;
122: yySeconds = 0;
123: yyMeridian = $2;
124: }
125: | tUNUMBER ':' tUNUMBER o_merid {
126: yyHour = $1;
127: yyMinutes = $3;
128: yySeconds = 0;
129: yyMeridian = $4;
130: }
131: | tUNUMBER ':' tUNUMBER tSNUMBER {
132: yyHour = $1;
133: yyMinutes = $3;
134: yyMeridian = MER24;
135: yyDSTmode = DSToff;
136: yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
137: }
138: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
139: yyHour = $1;
140: yyMinutes = $3;
141: yySeconds = $5;
142: yyMeridian = $6;
143: }
144: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
145: yyHour = $1;
146: yyMinutes = $3;
147: yySeconds = $5;
148: yyMeridian = MER24;
149: yyDSTmode = DSToff;
150: yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
151: }
152: ;
153:
154: zone : tZONE {
155: yyTimezone = $1;
156: yyDSTmode = DSToff;
157: }
158: | tDAYZONE {
159: yyTimezone = $1;
160: yyDSTmode = DSTon;
161: }
162: | tZONE tDST {
163: yyTimezone = $1;
164: yyDSTmode = DSTon;
165: }
166: ;
167:
168: day : tDAY {
169: yyDayOrdinal = 1;
170: yyDayNumber = $1;
171: }
172: | tDAY ',' {
173: yyDayOrdinal = 1;
174: yyDayNumber = $1;
175: }
176: | tUNUMBER tDAY {
177: yyDayOrdinal = $1;
178: yyDayNumber = $2;
179: }
180: ;
181:
182: date : tUNUMBER '/' tUNUMBER {
183: yyMonth = $1;
184: yyDay = $3;
185: }
186: | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
187: if ($1 >= 100) {
188: yyYear = $1;
189: yyMonth = $3;
190: yyDay = $5;
191: } else {
192: yyMonth = $1;
193: yyDay = $3;
194: yyYear = $5;
195: }
196: }
197: | tUNUMBER tSNUMBER tSNUMBER {
198: /* ISO 8601 format. yyyy-mm-dd. */
199: yyYear = $1;
200: yyMonth = -$2;
201: yyDay = -$3;
202: }
203: | tUNUMBER tMONTH tSNUMBER {
204: /* e.g. 17-JUN-1992. */
205: yyDay = $1;
206: yyMonth = $2;
207: yyYear = -$3;
208: }
209: | tMONTH tUNUMBER {
210: yyMonth = $1;
211: yyDay = $2;
212: }
213: | tMONTH tUNUMBER ',' tUNUMBER {
214: yyMonth = $1;
215: yyDay = $2;
216: yyYear = $4;
217: }
218: | tUNUMBER tMONTH {
219: yyMonth = $2;
220: yyDay = $1;
221: }
222: | tUNUMBER tMONTH tUNUMBER {
223: yyMonth = $2;
224: yyDay = $1;
225: yyYear = $3;
226: }
227: ;
228:
229: rel : relunit tAGO {
230: yyRelSeconds = -yyRelSeconds;
231: yyRelMonth = -yyRelMonth;
232: }
233: | relunit
234: ;
235:
236: relunit : tUNUMBER tMINUTE_UNIT {
237: yyRelSeconds += $1 * $2 * 60L;
238: }
239: | tSNUMBER tMINUTE_UNIT {
240: yyRelSeconds += $1 * $2 * 60L;
241: }
242: | tMINUTE_UNIT {
243: yyRelSeconds += $1 * 60L;
244: }
245: | tSNUMBER tSEC_UNIT {
246: yyRelSeconds += $1;
247: }
248: | tUNUMBER tSEC_UNIT {
249: yyRelSeconds += $1;
250: }
251: | tSEC_UNIT {
252: yyRelSeconds++;
253: }
254: | tSNUMBER tMONTH_UNIT {
255: yyRelMonth += $1 * $2;
256: }
257: | tUNUMBER tMONTH_UNIT {
258: yyRelMonth += $1 * $2;
259: }
260: | tMONTH_UNIT {
261: yyRelMonth += $1;
262: }
263: ;
264:
265: number : tUNUMBER {
266: if (yyHaveTime && yyHaveDate && !yyHaveRel)
267: yyYear = $1;
268: else {
269: if ($1 > 10000) {
270: yyHaveDate++;
271: yyDay= ($1)%100;
272: yyMonth= ($1/100)%100;
273: yyYear = $1/10000;
274: } else {
275: yyHaveTime++;
276: if ($1 < 100) {
277: yyHour = $1;
278: yyMinutes = 0;
279: } else {
280: yyHour = $1 / 100;
281: yyMinutes = $1 % 100;
282: }
283: yySeconds = 0;
284: yyMeridian = MER24;
285: }
286: }
287: }
288: ;
289:
290: o_merid : /* NULL */ {
291: $$ = MER24;
292: }
293: | tMERIDIAN {
294: $$ = $1;
295: }
296: ;
297:
298: %%
299:
300: /* Month and day table. */
301: static TABLE const MonthDayTable[] = {
302: { "january", tMONTH, 1 },
303: { "february", tMONTH, 2 },
304: { "march", tMONTH, 3 },
305: { "april", tMONTH, 4 },
306: { "may", tMONTH, 5 },
307: { "june", tMONTH, 6 },
308: { "july", tMONTH, 7 },
309: { "august", tMONTH, 8 },
310: { "september", tMONTH, 9 },
311: { "sept", tMONTH, 9 },
312: { "october", tMONTH, 10 },
313: { "november", tMONTH, 11 },
314: { "december", tMONTH, 12 },
315: { "sunday", tDAY, 0 },
316: { "monday", tDAY, 1 },
317: { "tuesday", tDAY, 2 },
318: { "tues", tDAY, 2 },
319: { "wednesday", tDAY, 3 },
320: { "wednes", tDAY, 3 },
321: { "thursday", tDAY, 4 },
322: { "thur", tDAY, 4 },
323: { "thurs", tDAY, 4 },
324: { "friday", tDAY, 5 },
325: { "saturday", tDAY, 6 },
326: { NULL }
327: };
328:
329: /* Time units table. */
330: static TABLE const UnitsTable[] = {
331: { "year", tMONTH_UNIT, 12 },
332: { "month", tMONTH_UNIT, 1 },
333: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
334: { "week", tMINUTE_UNIT, 7 * 24 * 60 },
335: { "day", tMINUTE_UNIT, 1 * 24 * 60 },
336: { "hour", tMINUTE_UNIT, 60 },
337: { "minute", tMINUTE_UNIT, 1 },
338: { "min", tMINUTE_UNIT, 1 },
339: { "second", tSEC_UNIT, 1 },
340: { "sec", tSEC_UNIT, 1 },
341: { NULL }
342: };
343:
344: /* Assorted relative-time words. */
345: static TABLE const OtherTable[] = {
346: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
347: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
348: { "today", tMINUTE_UNIT, 0 },
349: { "now", tMINUTE_UNIT, 0 },
350: { "last", tUNUMBER, -1 },
351: { "this", tMINUTE_UNIT, 0 },
352: { "next", tUNUMBER, 2 },
353: { "first", tUNUMBER, 1 },
354: /* { "second", tUNUMBER, 2 }, */
355: { "third", tUNUMBER, 3 },
356: { "fourth", tUNUMBER, 4 },
357: { "fifth", tUNUMBER, 5 },
358: { "sixth", tUNUMBER, 6 },
359: { "seventh", tUNUMBER, 7 },
360: { "eighth", tUNUMBER, 8 },
361: { "ninth", tUNUMBER, 9 },
362: { "tenth", tUNUMBER, 10 },
363: { "eleventh", tUNUMBER, 11 },
364: { "twelfth", tUNUMBER, 12 },
365: { "ago", tAGO, 1 },
366: { NULL }
367: };
368:
369: /* The timezone table. */
370: /* Some of these are commented out because a time_t can't store a float. */
371: static TABLE const TimezoneTable[] = {
372: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
373: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
374: { "utc", tZONE, HOUR( 0) },
375: { "wet", tZONE, HOUR( 0) }, /* Western European */
376: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
377: { "wat", tZONE, HOUR( 1) }, /* West Africa */
378: { "at", tZONE, HOUR( 2) }, /* Azores */
379: #if 0
380: /* For completeness. BST is also British Summer, and GST is
381: * also Guam Standard. */
382: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
383: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
384: #endif
385: #if 0
386: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
387: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
388: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
389: #endif
390: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
391: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
392: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
393: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
394: { "cst", tZONE, HOUR( 6) }, /* Central Standard */
395: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
396: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
397: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
398: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
399: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
400: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
401: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
402: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
403: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
404: { "cat", tZONE, HOUR(10) }, /* Central Alaska */
405: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
406: { "nt", tZONE, HOUR(11) }, /* Nome */
407: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
408: { "cet", tZONE, -HOUR(1) }, /* Central European */
409: { "met", tZONE, -HOUR(1) }, /* Middle European */
410: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
411: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
412: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
413: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
414: { "fwt", tZONE, -HOUR(1) }, /* French Winter */
415: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
416: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
417: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
418: #if 0
419: { "it", tZONE, -HOUR(3.5) },/* Iran */
420: #endif
421: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
422: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
423: #if 0
424: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
425: #endif
426: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
427: #if 0
428: /* For completeness. NST is also Newfoundland Stanard, and SST is
429: * also Swedish Summer. */
430: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
431: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
432: #endif /* 0 */
433: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
434: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
435: #if 0
436: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
437: #endif
438: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
439: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
440: #if 0
441: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
442: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
443: #endif
444: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
445: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
446: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
447: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
448: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
449: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
450: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
451: { NULL }
452: };
453:
454: /* Military timezone table. */
455: static TABLE const MilitaryTable[] = {
456: { "a", tZONE, HOUR( 1) },
457: { "b", tZONE, HOUR( 2) },
458: { "c", tZONE, HOUR( 3) },
459: { "d", tZONE, HOUR( 4) },
460: { "e", tZONE, HOUR( 5) },
461: { "f", tZONE, HOUR( 6) },
462: { "g", tZONE, HOUR( 7) },
463: { "h", tZONE, HOUR( 8) },
464: { "i", tZONE, HOUR( 9) },
465: { "k", tZONE, HOUR( 10) },
466: { "l", tZONE, HOUR( 11) },
467: { "m", tZONE, HOUR( 12) },
468: { "n", tZONE, HOUR(- 1) },
469: { "o", tZONE, HOUR(- 2) },
470: { "p", tZONE, HOUR(- 3) },
471: { "q", tZONE, HOUR(- 4) },
472: { "r", tZONE, HOUR(- 5) },
473: { "s", tZONE, HOUR(- 6) },
474: { "t", tZONE, HOUR(- 7) },
475: { "u", tZONE, HOUR(- 8) },
476: { "v", tZONE, HOUR(- 9) },
477: { "w", tZONE, HOUR(-10) },
478: { "x", tZONE, HOUR(-11) },
479: { "y", tZONE, HOUR(-12) },
480: { "z", tZONE, HOUR( 0) },
481: { NULL }
482: };
483:
484:
485: static int
486: yyerror(const char *s)
487: {
488: char *str;
489:
490: if (isspace(yyInput[0]) || !isprint(yyInput[0]))
1.4 xsa 491: (void)xasprintf(&str,
492: "%s: unexpected char 0x%02x in date string", s, yyInput[0]);
1.1 joris 493: else
1.3 ray 494: (void)xasprintf(&str, "%s: unexpected %s in date string",
1.1 joris 495: s, yyInput);
496:
497: warnx("%s", str);
1.13 nicm 498: free(str);
1.1 joris 499: return (0);
500: }
501:
502:
503: static time_t
504: ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
505: {
506: if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
507: return (-1);
508:
509: switch (Meridian) {
510: case MER24:
511: if (Hours < 0 || Hours > 23)
512: return (-1);
513: return (Hours * 60L + Minutes) * 60L + Seconds;
514: case MERam:
515: if (Hours < 1 || Hours > 12)
516: return (-1);
517: if (Hours == 12)
518: Hours = 0;
519: return (Hours * 60L + Minutes) * 60L + Seconds;
520: case MERpm:
521: if (Hours < 1 || Hours > 12)
522: return (-1);
523: if (Hours == 12)
524: Hours = 0;
525: return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
526: default:
1.9 ray 527: return (-1);
1.1 joris 528: }
529: /* NOTREACHED */
530: }
531:
532:
533: /* Year is either
534: * A negative number, which means to use its absolute value (why?)
535: * A number from 0 to 99, which means a year from 1900 to 1999, or
536: * The actual year (>=100).
537: */
538: static time_t
539: Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes,
540: time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode)
541: {
542: static int DaysInMonth[12] = {
543: 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
544: };
545: time_t tod;
546: time_t julian;
547: int i;
548:
549: if (Year < 0)
550: Year = -Year;
551: if (Year < 69)
552: Year += 2000;
553: else if (Year < 100) {
554: Year += 1900;
555: if (Year < YEAR_EPOCH)
556: Year += 100;
557: }
558: DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
559: ? 29 : 28;
1.11 deraadt 560: /* XXX Sloppily check for 2038 if time_t is 32 bits */
561: if (Year < YEAR_EPOCH ||
562: (sizeof(time_t) == sizeof(int) && Year > 2038) ||
563: Month < 1 || Month > 12 ||
1.1 joris 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) */