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1.1 jfb 1: %{
1.26 ! okan 2: /* $OpenBSD: date.y,v 1.25 2015/11/05 09:48:21 nicm Exp $ */
1.1 jfb 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 */
1.16 otto 16:
17: #include <ctype.h>
18: #include <string.h>
1.26 ! okan 19: #include <time.h>
1.1 jfb 20:
1.7 jfb 21: #include "cvs.h"
1.1 jfb 22:
1.3 jfb 23: #define YEAR_EPOCH 1970
24: #define YEAR_TMORIGIN 1900
1.1 jfb 25: #define HOUR(x) ((time_t)(x) * 60)
26: #define SECSPERDAY (24L * 60L * 60L)
27:
28:
29: /* An entry in the lexical lookup table */
30: typedef struct _TABLE {
31: char *name;
32: int type;
33: time_t value;
34: } TABLE;
35:
36:
1.4 jfb 37: /* Daylight-savings mode: on, off, or not yet known. */
1.1 jfb 38: typedef enum _DSTMODE {
39: DSTon, DSToff, DSTmaybe
40: } DSTMODE;
41:
1.4 jfb 42: /* Meridian: am, pm, or 24-hour style. */
1.1 jfb 43: typedef enum _MERIDIAN {
44: MERam, MERpm, MER24
45: } MERIDIAN;
46:
47:
48: /*
1.4 jfb 49: * Global variables. We could get rid of most of these by using a good
50: * union as the yacc stack. (This routine was originally written before
51: * yacc had the %union construct.) Maybe someday; right now we only use
52: * the %union very rarely.
53: */
1.7 jfb 54: static const char *yyInput;
1.1 jfb 55: static DSTMODE yyDSTmode;
56: static time_t yyDayOrdinal;
57: static time_t yyDayNumber;
58: static int yyHaveDate;
59: static int yyHaveDay;
60: static int yyHaveRel;
61: static int yyHaveTime;
62: static int yyHaveZone;
63: static time_t yyTimezone;
64: static time_t yyDay;
65: static time_t yyHour;
66: static time_t yyMinutes;
67: static time_t yyMonth;
68: static time_t yySeconds;
69: static time_t yyYear;
70: static MERIDIAN yyMeridian;
71: static time_t yyRelMonth;
72: static time_t yyRelSeconds;
73:
1.2 jfb 74:
1.14 xsa 75: static int yyerror(const char *);
76: static int yylex(void);
77: static int yyparse(void);
78: static int lookup(char *);
1.2 jfb 79:
1.1 jfb 80: %}
81:
82: %union {
83: time_t Number;
84: enum _MERIDIAN Meridian;
85: }
86:
87: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
88: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
89:
90: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
91: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
92: %type <Meridian> tMERIDIAN o_merid
93:
94: %%
95:
96: spec : /* NULL */
97: | spec item
98: ;
99:
100: item : time {
1.3 jfb 101: yyHaveTime++;
1.1 jfb 102: }
103: | zone {
1.3 jfb 104: yyHaveZone++;
1.1 jfb 105: }
106: | date {
1.3 jfb 107: yyHaveDate++;
1.1 jfb 108: }
109: | day {
1.3 jfb 110: yyHaveDay++;
1.1 jfb 111: }
112: | rel {
1.3 jfb 113: yyHaveRel++;
1.1 jfb 114: }
115: | number
116: ;
117:
118: time : tUNUMBER tMERIDIAN {
1.3 jfb 119: yyHour = $1;
120: yyMinutes = 0;
121: yySeconds = 0;
122: yyMeridian = $2;
1.1 jfb 123: }
124: | tUNUMBER ':' tUNUMBER o_merid {
1.3 jfb 125: yyHour = $1;
126: yyMinutes = $3;
127: yySeconds = 0;
128: yyMeridian = $4;
1.1 jfb 129: }
130: | tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 jfb 131: yyHour = $1;
132: yyMinutes = $3;
133: yyMeridian = MER24;
134: yyDSTmode = DSToff;
135: yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
1.1 jfb 136: }
137: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
1.3 jfb 138: yyHour = $1;
139: yyMinutes = $3;
140: yySeconds = $5;
141: yyMeridian = $6;
1.1 jfb 142: }
143: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 jfb 144: yyHour = $1;
145: yyMinutes = $3;
146: yySeconds = $5;
147: yyMeridian = MER24;
148: yyDSTmode = DSToff;
149: yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
1.1 jfb 150: }
151: ;
152:
153: zone : tZONE {
1.3 jfb 154: yyTimezone = $1;
155: yyDSTmode = DSToff;
1.1 jfb 156: }
157: | tDAYZONE {
1.3 jfb 158: yyTimezone = $1;
159: yyDSTmode = DSTon;
1.1 jfb 160: }
1.3 jfb 161: | tZONE tDST {
162: yyTimezone = $1;
163: yyDSTmode = DSTon;
1.1 jfb 164: }
165: ;
166:
167: day : tDAY {
1.3 jfb 168: yyDayOrdinal = 1;
169: yyDayNumber = $1;
1.1 jfb 170: }
171: | tDAY ',' {
1.3 jfb 172: yyDayOrdinal = 1;
173: yyDayNumber = $1;
1.1 jfb 174: }
175: | tUNUMBER tDAY {
1.3 jfb 176: yyDayOrdinal = $1;
177: yyDayNumber = $2;
1.1 jfb 178: }
179: ;
180:
181: date : tUNUMBER '/' tUNUMBER {
1.3 jfb 182: yyMonth = $1;
183: yyDay = $3;
184: }
185: | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
186: if ($1 >= 100) {
187: yyYear = $1;
188: yyMonth = $3;
189: yyDay = $5;
190: } else {
1.1 jfb 191: yyMonth = $1;
192: yyDay = $3;
1.3 jfb 193: yyYear = $5;
194: }
1.1 jfb 195: }
1.3 jfb 196: | tUNUMBER tSNUMBER tSNUMBER {
197: /* ISO 8601 format. yyyy-mm-dd. */
1.1 jfb 198: yyYear = $1;
1.3 jfb 199: yyMonth = -$2;
200: yyDay = -$3;
1.1 jfb 201: }
202: | tUNUMBER tMONTH tSNUMBER {
1.3 jfb 203: /* e.g. 17-JUN-1992. */
204: yyDay = $1;
205: yyMonth = $2;
206: yyYear = -$3;
1.1 jfb 207: }
208: | tMONTH tUNUMBER {
1.3 jfb 209: yyMonth = $1;
210: yyDay = $2;
1.1 jfb 211: }
212: | tMONTH tUNUMBER ',' tUNUMBER {
1.3 jfb 213: yyMonth = $1;
214: yyDay = $2;
215: yyYear = $4;
1.1 jfb 216: }
217: | tUNUMBER tMONTH {
1.3 jfb 218: yyMonth = $2;
219: yyDay = $1;
1.1 jfb 220: }
221: | tUNUMBER tMONTH tUNUMBER {
1.3 jfb 222: yyMonth = $2;
223: yyDay = $1;
224: yyYear = $3;
1.1 jfb 225: }
226: ;
227:
228: rel : relunit tAGO {
1.3 jfb 229: yyRelSeconds = -yyRelSeconds;
230: yyRelMonth = -yyRelMonth;
1.1 jfb 231: }
232: | relunit
233: ;
234:
235: relunit : tUNUMBER tMINUTE_UNIT {
1.3 jfb 236: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 237: }
238: | tSNUMBER tMINUTE_UNIT {
1.3 jfb 239: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 240: }
241: | tMINUTE_UNIT {
1.3 jfb 242: yyRelSeconds += $1 * 60L;
1.1 jfb 243: }
244: | tSNUMBER tSEC_UNIT {
1.3 jfb 245: yyRelSeconds += $1;
1.1 jfb 246: }
247: | tUNUMBER tSEC_UNIT {
1.3 jfb 248: yyRelSeconds += $1;
1.1 jfb 249: }
250: | tSEC_UNIT {
1.3 jfb 251: yyRelSeconds++;
1.1 jfb 252: }
253: | tSNUMBER tMONTH_UNIT {
1.3 jfb 254: yyRelMonth += $1 * $2;
1.1 jfb 255: }
256: | tUNUMBER tMONTH_UNIT {
1.3 jfb 257: yyRelMonth += $1 * $2;
1.1 jfb 258: }
259: | tMONTH_UNIT {
1.3 jfb 260: yyRelMonth += $1;
1.1 jfb 261: }
262: ;
263:
264: number : tUNUMBER {
1.3 jfb 265: if (yyHaveTime && yyHaveDate && !yyHaveRel)
266: yyYear = $1;
267: else {
268: if ($1 > 10000) {
1.1 jfb 269: yyHaveDate++;
270: yyDay= ($1)%100;
271: yyMonth= ($1/100)%100;
272: yyYear = $1/10000;
1.3 jfb 273: } else {
1.1 jfb 274: yyHaveTime++;
275: if ($1 < 100) {
1.3 jfb 276: yyHour = $1;
277: yyMinutes = 0;
278: } else {
1.1 jfb 279: yyHour = $1 / 100;
280: yyMinutes = $1 % 100;
281: }
282: yySeconds = 0;
283: yyMeridian = MER24;
284: }
1.3 jfb 285: }
1.1 jfb 286: }
287: ;
288:
289: o_merid : /* NULL */ {
290: $$ = MER24;
291: }
292: | tMERIDIAN {
293: $$ = $1;
294: }
295: ;
296:
297: %%
298:
299: /* Month and day table. */
300: static TABLE const MonthDayTable[] = {
301: { "january", tMONTH, 1 },
302: { "february", tMONTH, 2 },
303: { "march", tMONTH, 3 },
304: { "april", tMONTH, 4 },
305: { "may", tMONTH, 5 },
306: { "june", tMONTH, 6 },
307: { "july", tMONTH, 7 },
308: { "august", tMONTH, 8 },
309: { "september", tMONTH, 9 },
310: { "sept", tMONTH, 9 },
311: { "october", tMONTH, 10 },
312: { "november", tMONTH, 11 },
313: { "december", tMONTH, 12 },
314: { "sunday", tDAY, 0 },
315: { "monday", tDAY, 1 },
316: { "tuesday", tDAY, 2 },
317: { "tues", tDAY, 2 },
318: { "wednesday", tDAY, 3 },
319: { "wednes", tDAY, 3 },
320: { "thursday", tDAY, 4 },
321: { "thur", tDAY, 4 },
322: { "thurs", tDAY, 4 },
323: { "friday", tDAY, 5 },
324: { "saturday", tDAY, 6 },
325: { NULL }
326: };
327:
328: /* Time units table. */
329: static TABLE const UnitsTable[] = {
330: { "year", tMONTH_UNIT, 12 },
331: { "month", tMONTH_UNIT, 1 },
332: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
333: { "week", tMINUTE_UNIT, 7 * 24 * 60 },
334: { "day", tMINUTE_UNIT, 1 * 24 * 60 },
335: { "hour", tMINUTE_UNIT, 60 },
336: { "minute", tMINUTE_UNIT, 1 },
337: { "min", tMINUTE_UNIT, 1 },
338: { "second", tSEC_UNIT, 1 },
339: { "sec", tSEC_UNIT, 1 },
340: { NULL }
341: };
342:
343: /* Assorted relative-time words. */
344: static TABLE const OtherTable[] = {
345: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
346: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
347: { "today", tMINUTE_UNIT, 0 },
348: { "now", tMINUTE_UNIT, 0 },
349: { "last", tUNUMBER, -1 },
350: { "this", tMINUTE_UNIT, 0 },
351: { "next", tUNUMBER, 2 },
352: { "first", tUNUMBER, 1 },
353: /* { "second", tUNUMBER, 2 }, */
354: { "third", tUNUMBER, 3 },
355: { "fourth", tUNUMBER, 4 },
356: { "fifth", tUNUMBER, 5 },
357: { "sixth", tUNUMBER, 6 },
358: { "seventh", tUNUMBER, 7 },
359: { "eighth", tUNUMBER, 8 },
360: { "ninth", tUNUMBER, 9 },
361: { "tenth", tUNUMBER, 10 },
362: { "eleventh", tUNUMBER, 11 },
363: { "twelfth", tUNUMBER, 12 },
364: { "ago", tAGO, 1 },
365: { NULL }
366: };
367:
368: /* The timezone table. */
369: /* Some of these are commented out because a time_t can't store a float. */
370: static TABLE const TimezoneTable[] = {
371: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
1.4 jfb 372: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
1.1 jfb 373: { "utc", tZONE, HOUR( 0) },
374: { "wet", tZONE, HOUR( 0) }, /* Western European */
375: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
376: { "wat", tZONE, HOUR( 1) }, /* West Africa */
1.4 jfb 377: { "at", tZONE, HOUR( 2) }, /* Azores */
1.1 jfb 378: #if 0
379: /* For completeness. BST is also British Summer, and GST is
380: * also Guam Standard. */
381: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
382: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
383: #endif
384: #if 0
385: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
386: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
387: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
388: #endif
389: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
390: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
391: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
392: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
393: { "cst", tZONE, HOUR( 6) }, /* Central Standard */
394: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
395: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
396: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
397: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
398: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
399: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
400: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
401: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
402: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
403: { "cat", tZONE, HOUR(10) }, /* Central Alaska */
404: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
1.4 jfb 405: { "nt", tZONE, HOUR(11) }, /* Nome */
1.1 jfb 406: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
407: { "cet", tZONE, -HOUR(1) }, /* Central European */
408: { "met", tZONE, -HOUR(1) }, /* Middle European */
409: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
410: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
411: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
412: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
413: { "fwt", tZONE, -HOUR(1) }, /* French Winter */
414: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
415: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
1.4 jfb 416: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
1.1 jfb 417: #if 0
1.4 jfb 418: { "it", tZONE, -HOUR(3.5) },/* Iran */
1.1 jfb 419: #endif
420: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
421: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
422: #if 0
423: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
424: #endif
425: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
426: #if 0
427: /* For completeness. NST is also Newfoundland Stanard, and SST is
428: * also Swedish Summer. */
429: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
430: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
431: #endif /* 0 */
432: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
433: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
434: #if 0
1.4 jfb 435: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
1.1 jfb 436: #endif
437: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
438: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
439: #if 0
440: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
441: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
442: #endif
443: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
444: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
445: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
446: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
447: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
448: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
449: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
450: { NULL }
451: };
452:
453: /* Military timezone table. */
454: static TABLE const MilitaryTable[] = {
455: { "a", tZONE, HOUR( 1) },
456: { "b", tZONE, HOUR( 2) },
457: { "c", tZONE, HOUR( 3) },
458: { "d", tZONE, HOUR( 4) },
459: { "e", tZONE, HOUR( 5) },
460: { "f", tZONE, HOUR( 6) },
461: { "g", tZONE, HOUR( 7) },
462: { "h", tZONE, HOUR( 8) },
463: { "i", tZONE, HOUR( 9) },
464: { "k", tZONE, HOUR( 10) },
465: { "l", tZONE, HOUR( 11) },
466: { "m", tZONE, HOUR( 12) },
467: { "n", tZONE, HOUR(- 1) },
468: { "o", tZONE, HOUR(- 2) },
469: { "p", tZONE, HOUR(- 3) },
470: { "q", tZONE, HOUR(- 4) },
471: { "r", tZONE, HOUR(- 5) },
472: { "s", tZONE, HOUR(- 6) },
473: { "t", tZONE, HOUR(- 7) },
474: { "u", tZONE, HOUR(- 8) },
475: { "v", tZONE, HOUR(- 9) },
476: { "w", tZONE, HOUR(-10) },
477: { "x", tZONE, HOUR(-11) },
478: { "y", tZONE, HOUR(-12) },
479: { "z", tZONE, HOUR( 0) },
480: { NULL }
481: };
482:
483:
484: static int
1.9 otto 485: yyerror(const char *s)
1.1 jfb 486: {
1.18 cnst 487: #if !defined(TEST)
1.9 otto 488: char *str;
489:
1.18 cnst 490: (void)xasprintf(&str, "parsing date string: %s", s);
1.9 otto 491: cvs_log(LP_ERR, "%s", str);
1.25 nicm 492: free(str);
1.18 cnst 493: #endif
1.1 jfb 494: return (0);
495: }
496:
497:
498: static time_t
499: ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
500: {
501: if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
502: return (-1);
503:
504: switch (Meridian) {
505: case MER24:
506: if (Hours < 0 || Hours > 23)
507: return (-1);
508: return (Hours * 60L + Minutes) * 60L + Seconds;
509: case MERam:
510: if (Hours < 1 || Hours > 12)
511: return (-1);
512: if (Hours == 12)
513: Hours = 0;
514: return (Hours * 60L + Minutes) * 60L + Seconds;
515: case MERpm:
516: if (Hours < 1 || Hours > 12)
517: return (-1);
518: if (Hours == 12)
519: Hours = 0;
520: return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
521: default:
1.17 chl 522: return (-1);
1.1 jfb 523: }
524: /* NOTREACHED */
525: }
526:
527:
528: /* Year is either
529: * A negative number, which means to use its absolute value (why?)
530: * A number from 0 to 99, which means a year from 1900 to 1999, or
531: * The actual year (>=100).
532: */
533: static time_t
534: Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes,
535: time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode)
536: {
537: static int DaysInMonth[12] = {
538: 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
539: };
540: time_t tod;
541: time_t julian;
542: int i;
543:
544: if (Year < 0)
545: Year = -Year;
546: if (Year < 69)
547: Year += 2000;
548: else if (Year < 100) {
549: Year += 1900;
1.3 jfb 550: if (Year < YEAR_EPOCH)
1.1 jfb 551: Year += 100;
552: }
553: DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
554: ? 29 : 28;
1.23 deraadt 555: /* XXX Sloppily check for 2038 if time_t is 32 bits */
556: if (Year < YEAR_EPOCH ||
557: (sizeof(time_t) == sizeof(int) && Year > 2038) ||
558: Month < 1 || Month > 12 ||
1.1 jfb 559: /* Lint fluff: "conversion from long may lose accuracy" */
560: Day < 1 || Day > DaysInMonth[(int)--Month])
561: return (-1);
562:
563: for (julian = Day - 1, i = 0; i < Month; i++)
564: julian += DaysInMonth[i];
565:
1.3 jfb 566: for (i = YEAR_EPOCH; i < Year; i++)
1.1 jfb 567: julian += 365 + (i % 4 == 0);
568: julian *= SECSPERDAY;
569: julian += yyTimezone * 60L;
570:
571: if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
572: return (-1);
573: julian += tod;
574: if ((DSTmode == DSTon) ||
575: (DSTmode == DSTmaybe && localtime(&julian)->tm_isdst))
576: julian -= 60 * 60;
577: return (julian);
578: }
579:
580:
581: static time_t
582: DSTcorrect(time_t Start, time_t Future)
583: {
584: time_t StartDay;
585: time_t FutureDay;
586:
587: StartDay = (localtime(&Start)->tm_hour + 1) % 24;
588: FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
589: return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
590: }
591:
592:
593: static time_t
594: RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber)
595: {
596: struct tm *tm;
597: time_t now;
598:
599: now = Start;
600: tm = localtime(&now);
601: now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
602: now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
603: return DSTcorrect(Start, now);
604: }
605:
606:
607: static time_t
608: RelativeMonth(time_t Start, time_t RelMonth)
609: {
610: struct tm *tm;
611: time_t Month;
612: time_t Year;
613:
614: if (RelMonth == 0)
615: return (0);
616: tm = localtime(&Start);
617: Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth;
618: Year = Month / 12;
619: Month = Month % 12 + 1;
620: return DSTcorrect(Start,
621: Convert(Month, (time_t)tm->tm_mday, Year,
622: (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
623: MER24, DSTmaybe));
624: }
625:
626:
627: static int
1.8 jfb 628: lookup(char *buff)
1.1 jfb 629: {
1.15 ray 630: size_t len;
1.1 jfb 631: char *p, *q;
632: int i, abbrev;
633: const TABLE *tp;
634:
635: /* Make it lowercase. */
636: for (p = buff; *p; p++)
637: if (isupper(*p))
638: *p = tolower(*p);
639:
640: if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
641: yylval.Meridian = MERam;
642: return (tMERIDIAN);
643: }
644: if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
645: yylval.Meridian = MERpm;
646: return (tMERIDIAN);
647: }
648:
1.15 ray 649: len = strlen(buff);
1.1 jfb 650: /* See if we have an abbreviation for a month. */
1.15 ray 651: if (len == 3)
1.1 jfb 652: abbrev = 1;
1.15 ray 653: else if (len == 4 && buff[3] == '.') {
1.1 jfb 654: abbrev = 1;
655: buff[3] = '\0';
1.15 ray 656: --len;
1.1 jfb 657: } else
658: abbrev = 0;
659:
660: for (tp = MonthDayTable; tp->name; tp++) {
661: if (abbrev) {
662: if (strncmp(buff, tp->name, 3) == 0) {
663: yylval.Number = tp->value;
664: return (tp->type);
665: }
666: } else if (strcmp(buff, tp->name) == 0) {
667: yylval.Number = tp->value;
668: return (tp->type);
669: }
670: }
671:
672: for (tp = TimezoneTable; tp->name; tp++)
673: if (strcmp(buff, tp->name) == 0) {
674: yylval.Number = tp->value;
675: return (tp->type);
676: }
677:
678: if (strcmp(buff, "dst") == 0)
679: return (tDST);
680:
681: for (tp = UnitsTable; tp->name; tp++)
682: if (strcmp(buff, tp->name) == 0) {
683: yylval.Number = tp->value;
684: return (tp->type);
685: }
686:
687: /* Strip off any plural and try the units table again. */
1.15 ray 688: if (len != 0 && buff[len - 1] == 's') {
689: buff[len - 1] = '\0';
1.1 jfb 690: for (tp = UnitsTable; tp->name; tp++)
691: if (strcmp(buff, tp->name) == 0) {
692: yylval.Number = tp->value;
693: return (tp->type);
694: }
1.15 ray 695: buff[len - 1] = 's'; /* Put back for "this" in OtherTable. */
1.1 jfb 696: }
697:
698: for (tp = OtherTable; tp->name; tp++)
699: if (strcmp(buff, tp->name) == 0) {
700: yylval.Number = tp->value;
701: return (tp->type);
702: }
703:
704: /* Military timezones. */
1.15 ray 705: if (len == 1 && isalpha(*buff)) {
1.1 jfb 706: for (tp = MilitaryTable; tp->name; tp++)
707: if (strcmp(buff, tp->name) == 0) {
708: yylval.Number = tp->value;
709: return (tp->type);
710: }
711: }
712:
713: /* Drop out any periods and try the timezone table again. */
714: for (i = 0, p = q = buff; *q; q++)
715: if (*q != '.')
716: *p++ = *q;
717: else
718: i++;
719: *p = '\0';
720: if (i)
721: for (tp = TimezoneTable; tp->name; tp++)
722: if (strcmp(buff, tp->name) == 0) {
723: yylval.Number = tp->value;
724: return (tp->type);
725: }
726:
727: return (tID);
728: }
729:
730:
731: static int
732: yylex(void)
733: {
734: char c, *p, buff[20];
735: int count, sign;
736:
737: for (;;) {
738: while (isspace(*yyInput))
739: yyInput++;
740:
741: if (isdigit(c = *yyInput) || c == '-' || c == '+') {
742: if (c == '-' || c == '+') {
743: sign = c == '-' ? -1 : 1;
744: if (!isdigit(*++yyInput))
745: /* skip the '-' sign */
746: continue;
747: }
748: else
749: sign = 0;
750:
751: for (yylval.Number = 0; isdigit(c = *yyInput++); )
752: yylval.Number = 10 * yylval.Number + c - '0';
753: yyInput--;
754: if (sign < 0)
755: yylval.Number = -yylval.Number;
756: return sign ? tSNUMBER : tUNUMBER;
757: }
758:
759: if (isalpha(c)) {
760: for (p = buff; isalpha(c = *yyInput++) || c == '.'; )
761: if (p < &buff[sizeof buff - 1])
762: *p++ = c;
763: *p = '\0';
764: yyInput--;
1.8 jfb 765: return lookup(buff);
1.1 jfb 766: }
767: if (c != '(')
768: return *yyInput++;
769:
770: count = 0;
771: do {
772: c = *yyInput++;
773: if (c == '\0')
774: return (c);
775: if (c == '(')
776: count++;
777: else if (c == ')')
778: count--;
779: } while (count > 0);
780: }
781: }
782:
783: /* Yield A - B, measured in seconds. */
784: static long
1.3 jfb 785: difftm(struct tm *a, struct tm *b)
1.1 jfb 786: {
1.3 jfb 787: int ay = a->tm_year + (YEAR_TMORIGIN - 1);
788: int by = b->tm_year + (YEAR_TMORIGIN - 1);
1.1 jfb 789: int days = (
1.10 reyk 790: /* difference in day of year */
791: a->tm_yday - b->tm_yday
792: /* + intervening leap days */
793: + ((ay >> 2) - (by >> 2))
794: - (ay/100 - by/100)
795: + ((ay/100 >> 2) - (by/100 >> 2))
796: /* + difference in years * 365 */
797: + (long)(ay-by) * 365);
1.1 jfb 798: return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
799: + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec));
800: }
801:
1.8 jfb 802: /*
1.20 ray 803: * date_parse()
1.8 jfb 804: *
805: * Returns the number of seconds since the Epoch corresponding to the date.
806: */
1.1 jfb 807: time_t
1.20 ray 808: date_parse(const char *p)
1.1 jfb 809: {
1.19 ray 810: struct tm gmt, tm;
811: time_t Start, tod, nowtime, tz;
1.7 jfb 812:
1.1 jfb 813: yyInput = p;
814:
1.19 ray 815: if (time(&nowtime) == -1 || !gmtime_r(&nowtime, &gmt) ||
816: !localtime_r(&nowtime, &tm))
1.21 ray 817: return -1;
1.19 ray 818:
819: tz = difftm(&gmt, &tm) / 60;
820:
821: if (tm.tm_isdst)
822: tz += 60;
823:
824: yyYear = tm.tm_year + 1900;
825: yyMonth = tm.tm_mon + 1;
826: yyDay = tm.tm_mday;
827: yyTimezone = tz;
1.1 jfb 828: yyDSTmode = DSTmaybe;
829: yyHour = 0;
830: yyMinutes = 0;
831: yySeconds = 0;
832: yyMeridian = MER24;
833: yyRelSeconds = 0;
834: yyRelMonth = 0;
835: yyHaveDate = 0;
836: yyHaveDay = 0;
837: yyHaveRel = 0;
838: yyHaveTime = 0;
839: yyHaveZone = 0;
840:
841: if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 ||
842: yyHaveDate > 1 || yyHaveDay > 1)
843: return (-1);
844:
845: if (yyHaveDate || yyHaveTime || yyHaveDay) {
846: Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes,
847: yySeconds, yyMeridian, yyDSTmode);
848: if (Start < 0)
849: return (-1);
850: } else {
851: Start = nowtime;
852: if (!yyHaveRel)
1.19 ray 853: Start -= ((tm.tm_hour * 60L + tm.tm_min) * 60L) +
854: tm.tm_sec;
1.1 jfb 855: }
856:
857: Start += yyRelSeconds;
858: Start += RelativeMonth(Start, yyRelMonth);
859:
860: if (yyHaveDay && !yyHaveDate) {
861: tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
862: Start += tod;
863: }
864:
1.22 ray 865: return Start;
1.1 jfb 866: }
867:
868: #if defined(TEST)
869: /* ARGSUSED */
870: int
871: main(int argc, char **argv)
872: {
873: char buff[128];
874: time_t d;
875:
876: (void)printf("Enter date, or blank line to exit.\n\t> ");
877: (void)fflush(stdout);
878: while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
1.20 ray 879: d = date_parse(buff);
1.1 jfb 880: if (d == -1)
881: (void)printf("Bad format - couldn't convert.\n");
882: else
883: (void)printf("%s", ctime(&d));
884: (void)printf("\t> ");
885: (void)fflush(stdout);
886: }
887:
888: return (0);
889: }
890: #endif /* defined(TEST) */