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1.1 jfb 1: %{
1.8 ! jfb 2: /* $OpenBSD: date.y,v 1.7 2005/05/19 04:17:24 jfb 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 */
16:
17: #include <sys/types.h>
18: #include <sys/timeb.h>
19:
20: #include <ctype.h>
21: #include <stdio.h>
1.2 jfb 22: #include <stdarg.h>
1.1 jfb 23: #include <stdlib.h>
24: #include <string.h>
25: #include <time.h>
26:
27: #include "log.h"
1.7 jfb 28: #include "cvs.h"
1.1 jfb 29:
1.3 jfb 30: #define YEAR_EPOCH 1970
31: #define YEAR_TMORIGIN 1900
1.1 jfb 32: #define HOUR(x) ((time_t)(x) * 60)
33: #define SECSPERDAY (24L * 60L * 60L)
34:
35:
36: /* An entry in the lexical lookup table */
37: typedef struct _TABLE {
38: char *name;
39: int type;
40: time_t value;
41: } TABLE;
42:
43:
1.4 jfb 44: /* Daylight-savings mode: on, off, or not yet known. */
1.1 jfb 45: typedef enum _DSTMODE {
46: DSTon, DSToff, DSTmaybe
47: } DSTMODE;
48:
1.4 jfb 49: /* Meridian: am, pm, or 24-hour style. */
1.1 jfb 50: typedef enum _MERIDIAN {
51: MERam, MERpm, MER24
52: } MERIDIAN;
53:
54:
55: /*
1.4 jfb 56: * Global variables. We could get rid of most of these by using a good
57: * union as the yacc stack. (This routine was originally written before
58: * yacc had the %union construct.) Maybe someday; right now we only use
59: * the %union very rarely.
60: */
1.7 jfb 61: static const char *yyInput;
1.1 jfb 62: static DSTMODE yyDSTmode;
63: static time_t yyDayOrdinal;
64: static time_t yyDayNumber;
65: static int yyHaveDate;
66: static int yyHaveDay;
67: static int yyHaveRel;
68: static int yyHaveTime;
69: static int yyHaveZone;
70: static time_t yyTimezone;
71: static time_t yyDay;
72: static time_t yyHour;
73: static time_t yyMinutes;
74: static time_t yyMonth;
75: static time_t yySeconds;
76: static time_t yyYear;
77: static MERIDIAN yyMeridian;
78: static time_t yyRelMonth;
79: static time_t yyRelSeconds;
80:
1.2 jfb 81:
82: static int yyerror (const char *, ...);
83: static int yylex (void);
84: static int yyparse (void);
1.8 ! jfb 85: static int lookup (char *);
1.2 jfb 86:
1.1 jfb 87: %}
88:
89: %union {
90: time_t Number;
91: enum _MERIDIAN Meridian;
92: }
93:
94: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
95: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
96:
97: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
98: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
99: %type <Meridian> tMERIDIAN o_merid
100:
101: %%
102:
103: spec : /* NULL */
104: | spec item
105: ;
106:
107: item : time {
1.3 jfb 108: yyHaveTime++;
1.1 jfb 109: }
110: | zone {
1.3 jfb 111: yyHaveZone++;
1.1 jfb 112: }
113: | date {
1.3 jfb 114: yyHaveDate++;
1.1 jfb 115: }
116: | day {
1.3 jfb 117: yyHaveDay++;
1.1 jfb 118: }
119: | rel {
1.3 jfb 120: yyHaveRel++;
1.1 jfb 121: }
122: | number
123: ;
124:
125: time : tUNUMBER tMERIDIAN {
1.3 jfb 126: yyHour = $1;
127: yyMinutes = 0;
128: yySeconds = 0;
129: yyMeridian = $2;
1.1 jfb 130: }
131: | tUNUMBER ':' tUNUMBER o_merid {
1.3 jfb 132: yyHour = $1;
133: yyMinutes = $3;
134: yySeconds = 0;
135: yyMeridian = $4;
1.1 jfb 136: }
137: | tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 jfb 138: yyHour = $1;
139: yyMinutes = $3;
140: yyMeridian = MER24;
141: yyDSTmode = DSToff;
142: yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
1.1 jfb 143: }
144: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
1.3 jfb 145: yyHour = $1;
146: yyMinutes = $3;
147: yySeconds = $5;
148: yyMeridian = $6;
1.1 jfb 149: }
150: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 jfb 151: yyHour = $1;
152: yyMinutes = $3;
153: yySeconds = $5;
154: yyMeridian = MER24;
155: yyDSTmode = DSToff;
156: yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
1.1 jfb 157: }
158: ;
159:
160: zone : tZONE {
1.3 jfb 161: yyTimezone = $1;
162: yyDSTmode = DSToff;
1.1 jfb 163: }
164: | tDAYZONE {
1.3 jfb 165: yyTimezone = $1;
166: yyDSTmode = DSTon;
1.1 jfb 167: }
1.3 jfb 168: | tZONE tDST {
169: yyTimezone = $1;
170: yyDSTmode = DSTon;
1.1 jfb 171: }
172: ;
173:
174: day : tDAY {
1.3 jfb 175: yyDayOrdinal = 1;
176: yyDayNumber = $1;
1.1 jfb 177: }
178: | tDAY ',' {
1.3 jfb 179: yyDayOrdinal = 1;
180: yyDayNumber = $1;
1.1 jfb 181: }
182: | tUNUMBER tDAY {
1.3 jfb 183: yyDayOrdinal = $1;
184: yyDayNumber = $2;
1.1 jfb 185: }
186: ;
187:
188: date : tUNUMBER '/' tUNUMBER {
1.3 jfb 189: yyMonth = $1;
190: yyDay = $3;
191: }
192: | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
193: if ($1 >= 100) {
194: yyYear = $1;
195: yyMonth = $3;
196: yyDay = $5;
197: } else {
1.1 jfb 198: yyMonth = $1;
199: yyDay = $3;
1.3 jfb 200: yyYear = $5;
201: }
1.1 jfb 202: }
1.3 jfb 203: | tUNUMBER tSNUMBER tSNUMBER {
204: /* ISO 8601 format. yyyy-mm-dd. */
1.1 jfb 205: yyYear = $1;
1.3 jfb 206: yyMonth = -$2;
207: yyDay = -$3;
1.1 jfb 208: }
209: | tUNUMBER tMONTH tSNUMBER {
1.3 jfb 210: /* e.g. 17-JUN-1992. */
211: yyDay = $1;
212: yyMonth = $2;
213: yyYear = -$3;
1.1 jfb 214: }
215: | tMONTH tUNUMBER {
1.3 jfb 216: yyMonth = $1;
217: yyDay = $2;
1.1 jfb 218: }
219: | tMONTH tUNUMBER ',' tUNUMBER {
1.3 jfb 220: yyMonth = $1;
221: yyDay = $2;
222: yyYear = $4;
1.1 jfb 223: }
224: | tUNUMBER tMONTH {
1.3 jfb 225: yyMonth = $2;
226: yyDay = $1;
1.1 jfb 227: }
228: | tUNUMBER tMONTH tUNUMBER {
1.3 jfb 229: yyMonth = $2;
230: yyDay = $1;
231: yyYear = $3;
1.1 jfb 232: }
233: ;
234:
235: rel : relunit tAGO {
1.3 jfb 236: yyRelSeconds = -yyRelSeconds;
237: yyRelMonth = -yyRelMonth;
1.1 jfb 238: }
239: | relunit
240: ;
241:
242: relunit : tUNUMBER tMINUTE_UNIT {
1.3 jfb 243: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 244: }
245: | tSNUMBER tMINUTE_UNIT {
1.3 jfb 246: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 247: }
248: | tMINUTE_UNIT {
1.3 jfb 249: yyRelSeconds += $1 * 60L;
1.1 jfb 250: }
251: | tSNUMBER tSEC_UNIT {
1.3 jfb 252: yyRelSeconds += $1;
1.1 jfb 253: }
254: | tUNUMBER tSEC_UNIT {
1.3 jfb 255: yyRelSeconds += $1;
1.1 jfb 256: }
257: | tSEC_UNIT {
1.3 jfb 258: yyRelSeconds++;
1.1 jfb 259: }
260: | tSNUMBER tMONTH_UNIT {
1.3 jfb 261: yyRelMonth += $1 * $2;
1.1 jfb 262: }
263: | tUNUMBER tMONTH_UNIT {
1.3 jfb 264: yyRelMonth += $1 * $2;
1.1 jfb 265: }
266: | tMONTH_UNIT {
1.3 jfb 267: yyRelMonth += $1;
1.1 jfb 268: }
269: ;
270:
271: number : tUNUMBER {
1.3 jfb 272: if (yyHaveTime && yyHaveDate && !yyHaveRel)
273: yyYear = $1;
274: else {
275: if ($1 > 10000) {
1.1 jfb 276: yyHaveDate++;
277: yyDay= ($1)%100;
278: yyMonth= ($1/100)%100;
279: yyYear = $1/10000;
1.3 jfb 280: } else {
1.1 jfb 281: yyHaveTime++;
282: if ($1 < 100) {
1.3 jfb 283: yyHour = $1;
284: yyMinutes = 0;
285: } else {
1.1 jfb 286: yyHour = $1 / 100;
287: yyMinutes = $1 % 100;
288: }
289: yySeconds = 0;
290: yyMeridian = MER24;
291: }
1.3 jfb 292: }
1.1 jfb 293: }
294: ;
295:
296: o_merid : /* NULL */ {
297: $$ = MER24;
298: }
299: | tMERIDIAN {
300: $$ = $1;
301: }
302: ;
303:
304: %%
305:
306: /* Month and day table. */
307: static TABLE const MonthDayTable[] = {
308: { "january", tMONTH, 1 },
309: { "february", tMONTH, 2 },
310: { "march", tMONTH, 3 },
311: { "april", tMONTH, 4 },
312: { "may", tMONTH, 5 },
313: { "june", tMONTH, 6 },
314: { "july", tMONTH, 7 },
315: { "august", tMONTH, 8 },
316: { "september", tMONTH, 9 },
317: { "sept", tMONTH, 9 },
318: { "october", tMONTH, 10 },
319: { "november", tMONTH, 11 },
320: { "december", tMONTH, 12 },
321: { "sunday", tDAY, 0 },
322: { "monday", tDAY, 1 },
323: { "tuesday", tDAY, 2 },
324: { "tues", tDAY, 2 },
325: { "wednesday", tDAY, 3 },
326: { "wednes", tDAY, 3 },
327: { "thursday", tDAY, 4 },
328: { "thur", tDAY, 4 },
329: { "thurs", tDAY, 4 },
330: { "friday", tDAY, 5 },
331: { "saturday", tDAY, 6 },
332: { NULL }
333: };
334:
335: /* Time units table. */
336: static TABLE const UnitsTable[] = {
337: { "year", tMONTH_UNIT, 12 },
338: { "month", tMONTH_UNIT, 1 },
339: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
340: { "week", tMINUTE_UNIT, 7 * 24 * 60 },
341: { "day", tMINUTE_UNIT, 1 * 24 * 60 },
342: { "hour", tMINUTE_UNIT, 60 },
343: { "minute", tMINUTE_UNIT, 1 },
344: { "min", tMINUTE_UNIT, 1 },
345: { "second", tSEC_UNIT, 1 },
346: { "sec", tSEC_UNIT, 1 },
347: { NULL }
348: };
349:
350: /* Assorted relative-time words. */
351: static TABLE const OtherTable[] = {
352: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
353: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
354: { "today", tMINUTE_UNIT, 0 },
355: { "now", tMINUTE_UNIT, 0 },
356: { "last", tUNUMBER, -1 },
357: { "this", tMINUTE_UNIT, 0 },
358: { "next", tUNUMBER, 2 },
359: { "first", tUNUMBER, 1 },
360: /* { "second", tUNUMBER, 2 }, */
361: { "third", tUNUMBER, 3 },
362: { "fourth", tUNUMBER, 4 },
363: { "fifth", tUNUMBER, 5 },
364: { "sixth", tUNUMBER, 6 },
365: { "seventh", tUNUMBER, 7 },
366: { "eighth", tUNUMBER, 8 },
367: { "ninth", tUNUMBER, 9 },
368: { "tenth", tUNUMBER, 10 },
369: { "eleventh", tUNUMBER, 11 },
370: { "twelfth", tUNUMBER, 12 },
371: { "ago", tAGO, 1 },
372: { NULL }
373: };
374:
375: /* The timezone table. */
376: /* Some of these are commented out because a time_t can't store a float. */
377: static TABLE const TimezoneTable[] = {
378: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
1.4 jfb 379: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
1.1 jfb 380: { "utc", tZONE, HOUR( 0) },
381: { "wet", tZONE, HOUR( 0) }, /* Western European */
382: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
383: { "wat", tZONE, HOUR( 1) }, /* West Africa */
1.4 jfb 384: { "at", tZONE, HOUR( 2) }, /* Azores */
1.1 jfb 385: #if 0
386: /* For completeness. BST is also British Summer, and GST is
387: * also Guam Standard. */
388: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
389: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
390: #endif
391: #if 0
392: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
393: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
394: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
395: #endif
396: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
397: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
398: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
399: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
400: { "cst", tZONE, HOUR( 6) }, /* Central Standard */
401: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
402: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
403: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
404: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
405: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
406: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
407: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
408: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
409: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
410: { "cat", tZONE, HOUR(10) }, /* Central Alaska */
411: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
1.4 jfb 412: { "nt", tZONE, HOUR(11) }, /* Nome */
1.1 jfb 413: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
414: { "cet", tZONE, -HOUR(1) }, /* Central European */
415: { "met", tZONE, -HOUR(1) }, /* Middle European */
416: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
417: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
418: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
419: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
420: { "fwt", tZONE, -HOUR(1) }, /* French Winter */
421: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
422: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
1.4 jfb 423: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
1.1 jfb 424: #if 0
1.4 jfb 425: { "it", tZONE, -HOUR(3.5) },/* Iran */
1.1 jfb 426: #endif
427: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
428: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
429: #if 0
430: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
431: #endif
432: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
433: #if 0
434: /* For completeness. NST is also Newfoundland Stanard, and SST is
435: * also Swedish Summer. */
436: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
437: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
438: #endif /* 0 */
439: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
440: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
441: #if 0
1.4 jfb 442: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
1.1 jfb 443: #endif
444: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
445: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
446: #if 0
447: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
448: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
449: #endif
450: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
451: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
452: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
453: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
454: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
455: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
456: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
457: { NULL }
458: };
459:
460: /* Military timezone table. */
461: static TABLE const MilitaryTable[] = {
462: { "a", tZONE, HOUR( 1) },
463: { "b", tZONE, HOUR( 2) },
464: { "c", tZONE, HOUR( 3) },
465: { "d", tZONE, HOUR( 4) },
466: { "e", tZONE, HOUR( 5) },
467: { "f", tZONE, HOUR( 6) },
468: { "g", tZONE, HOUR( 7) },
469: { "h", tZONE, HOUR( 8) },
470: { "i", tZONE, HOUR( 9) },
471: { "k", tZONE, HOUR( 10) },
472: { "l", tZONE, HOUR( 11) },
473: { "m", tZONE, HOUR( 12) },
474: { "n", tZONE, HOUR(- 1) },
475: { "o", tZONE, HOUR(- 2) },
476: { "p", tZONE, HOUR(- 3) },
477: { "q", tZONE, HOUR(- 4) },
478: { "r", tZONE, HOUR(- 5) },
479: { "s", tZONE, HOUR(- 6) },
480: { "t", tZONE, HOUR(- 7) },
481: { "u", tZONE, HOUR(- 8) },
482: { "v", tZONE, HOUR(- 9) },
483: { "w", tZONE, HOUR(-10) },
484: { "x", tZONE, HOUR(-11) },
485: { "y", tZONE, HOUR(-12) },
486: { "z", tZONE, HOUR( 0) },
487: { NULL }
488: };
489:
490:
491: /* ARGSUSED */
492: static int
1.2 jfb 493: yyerror(const char *fmt, ...)
1.1 jfb 494: {
1.2 jfb 495: va_list vap;
496:
497: va_start(vap, fmt);
1.5 joris 498: #if defined(TEST)
499: vprintf(fmt, vap);
500: #else
1.2 jfb 501: cvs_vlog(LP_ERR, fmt, vap);
1.5 joris 502: #endif
1.2 jfb 503: va_end(vap);
504:
1.1 jfb 505: return (0);
506: }
507:
508:
509: static time_t
510: ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
511: {
512: if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
513: return (-1);
514:
515: switch (Meridian) {
516: case MER24:
517: if (Hours < 0 || Hours > 23)
518: return (-1);
519: return (Hours * 60L + Minutes) * 60L + Seconds;
520: case MERam:
521: if (Hours < 1 || Hours > 12)
522: return (-1);
523: if (Hours == 12)
524: Hours = 0;
525: return (Hours * 60L + Minutes) * 60L + Seconds;
526: case MERpm:
527: if (Hours < 1 || Hours > 12)
528: return (-1);
529: if (Hours == 12)
530: Hours = 0;
531: return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
532: default:
533: abort ();
534: }
535: /* NOTREACHED */
536: }
537:
538:
539: /* Year is either
540: * A negative number, which means to use its absolute value (why?)
541: * A number from 0 to 99, which means a year from 1900 to 1999, or
542: * The actual year (>=100).
543: */
544: static time_t
545: Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes,
546: time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode)
547: {
548: static int DaysInMonth[12] = {
549: 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
550: };
551: time_t tod;
552: time_t julian;
553: int i;
554:
555: if (Year < 0)
556: Year = -Year;
557: if (Year < 69)
558: Year += 2000;
559: else if (Year < 100) {
560: Year += 1900;
1.3 jfb 561: if (Year < YEAR_EPOCH)
1.1 jfb 562: Year += 100;
563: }
564: DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
565: ? 29 : 28;
566: /* Checking for 2038 bogusly assumes that time_t is 32 bits. But
567: I'm too lazy to try to check for time_t overflow in another way. */
1.3 jfb 568: if (Year < YEAR_EPOCH || Year > 2038 || Month < 1 || Month > 12 ||
1.1 jfb 569: /* Lint fluff: "conversion from long may lose accuracy" */
570: Day < 1 || Day > DaysInMonth[(int)--Month])
571: return (-1);
572:
573: for (julian = Day - 1, i = 0; i < Month; i++)
574: julian += DaysInMonth[i];
575:
1.3 jfb 576: for (i = YEAR_EPOCH; i < Year; i++)
1.1 jfb 577: julian += 365 + (i % 4 == 0);
578: julian *= SECSPERDAY;
579: julian += yyTimezone * 60L;
580:
581: if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
582: return (-1);
583: julian += tod;
584: if ((DSTmode == DSTon) ||
585: (DSTmode == DSTmaybe && localtime(&julian)->tm_isdst))
586: julian -= 60 * 60;
587: return (julian);
588: }
589:
590:
591: static time_t
592: DSTcorrect(time_t Start, time_t Future)
593: {
594: time_t StartDay;
595: time_t FutureDay;
596:
597: StartDay = (localtime(&Start)->tm_hour + 1) % 24;
598: FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
599: return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
600: }
601:
602:
603: static time_t
604: RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber)
605: {
606: struct tm *tm;
607: time_t now;
608:
609: now = Start;
610: tm = localtime(&now);
611: now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
612: now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
613: return DSTcorrect(Start, now);
614: }
615:
616:
617: static time_t
618: RelativeMonth(time_t Start, time_t RelMonth)
619: {
620: struct tm *tm;
621: time_t Month;
622: time_t Year;
623:
624: if (RelMonth == 0)
625: return (0);
626: tm = localtime(&Start);
627: Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth;
628: Year = Month / 12;
629: Month = Month % 12 + 1;
630: return DSTcorrect(Start,
631: Convert(Month, (time_t)tm->tm_mday, Year,
632: (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
633: MER24, DSTmaybe));
634: }
635:
636:
637: static int
1.8 ! jfb 638: lookup(char *buff)
1.1 jfb 639: {
640: char *p, *q;
641: int i, abbrev;
642: const TABLE *tp;
643:
644: /* Make it lowercase. */
645: for (p = buff; *p; p++)
646: if (isupper(*p))
647: *p = tolower(*p);
648:
649: if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
650: yylval.Meridian = MERam;
651: return (tMERIDIAN);
652: }
653: if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
654: yylval.Meridian = MERpm;
655: return (tMERIDIAN);
656: }
657:
658: /* See if we have an abbreviation for a month. */
659: if (strlen(buff) == 3)
660: abbrev = 1;
661: else if (strlen(buff) == 4 && buff[3] == '.') {
662: abbrev = 1;
663: buff[3] = '\0';
664: } else
665: abbrev = 0;
666:
667: for (tp = MonthDayTable; tp->name; tp++) {
668: if (abbrev) {
669: if (strncmp(buff, tp->name, 3) == 0) {
670: yylval.Number = tp->value;
671: return (tp->type);
672: }
673: } else if (strcmp(buff, tp->name) == 0) {
674: yylval.Number = tp->value;
675: return (tp->type);
676: }
677: }
678:
679: for (tp = TimezoneTable; tp->name; tp++)
680: if (strcmp(buff, tp->name) == 0) {
681: yylval.Number = tp->value;
682: return (tp->type);
683: }
684:
685: if (strcmp(buff, "dst") == 0)
686: return (tDST);
687:
688: for (tp = UnitsTable; tp->name; tp++)
689: if (strcmp(buff, tp->name) == 0) {
690: yylval.Number = tp->value;
691: return (tp->type);
692: }
693:
694: /* Strip off any plural and try the units table again. */
695: i = strlen(buff) - 1;
696: if (buff[i] == 's') {
697: buff[i] = '\0';
698: for (tp = UnitsTable; tp->name; tp++)
699: if (strcmp(buff, tp->name) == 0) {
700: yylval.Number = tp->value;
701: return (tp->type);
702: }
703: buff[i] = 's'; /* Put back for "this" in OtherTable. */
704: }
705:
706: for (tp = OtherTable; tp->name; tp++)
707: if (strcmp(buff, tp->name) == 0) {
708: yylval.Number = tp->value;
709: return (tp->type);
710: }
711:
712: /* Military timezones. */
713: if (buff[1] == '\0' && isalpha(*buff)) {
714: for (tp = MilitaryTable; tp->name; tp++)
715: if (strcmp(buff, tp->name) == 0) {
716: yylval.Number = tp->value;
717: return (tp->type);
718: }
719: }
720:
721: /* Drop out any periods and try the timezone table again. */
722: for (i = 0, p = q = buff; *q; q++)
723: if (*q != '.')
724: *p++ = *q;
725: else
726: i++;
727: *p = '\0';
728: if (i)
729: for (tp = TimezoneTable; tp->name; tp++)
730: if (strcmp(buff, tp->name) == 0) {
731: yylval.Number = tp->value;
732: return (tp->type);
733: }
734:
735: return (tID);
736: }
737:
738:
739: static int
740: yylex(void)
741: {
742: char c, *p, buff[20];
743: int count, sign;
744:
745: for (;;) {
746: while (isspace(*yyInput))
747: yyInput++;
748:
749: if (isdigit(c = *yyInput) || c == '-' || c == '+') {
750: if (c == '-' || c == '+') {
751: sign = c == '-' ? -1 : 1;
752: if (!isdigit(*++yyInput))
753: /* skip the '-' sign */
754: continue;
755: }
756: else
757: sign = 0;
758:
759: for (yylval.Number = 0; isdigit(c = *yyInput++); )
760: yylval.Number = 10 * yylval.Number + c - '0';
761: yyInput--;
762: if (sign < 0)
763: yylval.Number = -yylval.Number;
764: return sign ? tSNUMBER : tUNUMBER;
765: }
766:
767: if (isalpha(c)) {
768: for (p = buff; isalpha(c = *yyInput++) || c == '.'; )
769: if (p < &buff[sizeof buff - 1])
770: *p++ = c;
771: *p = '\0';
772: yyInput--;
1.8 ! jfb 773: return lookup(buff);
1.1 jfb 774: }
775: if (c != '(')
776: return *yyInput++;
777:
778: count = 0;
779: do {
780: c = *yyInput++;
781: if (c == '\0')
782: return (c);
783: if (c == '(')
784: count++;
785: else if (c == ')')
786: count--;
787: } while (count > 0);
788: }
789: }
790:
791: /* Yield A - B, measured in seconds. */
792: static long
1.3 jfb 793: difftm(struct tm *a, struct tm *b)
1.1 jfb 794: {
1.3 jfb 795: int ay = a->tm_year + (YEAR_TMORIGIN - 1);
796: int by = b->tm_year + (YEAR_TMORIGIN - 1);
1.1 jfb 797: int days = (
798: /* difference in day of year */
799: a->tm_yday - b->tm_yday
800: /* + intervening leap days */
801: + ((ay >> 2) - (by >> 2))
802: - (ay/100 - by/100)
803: + ((ay/100 >> 2) - (by/100 >> 2))
804: /* + difference in years * 365 */
805: + (long)(ay-by) * 365
806: );
807: return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
808: + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec));
809: }
810:
1.8 ! jfb 811: /*
! 812: * cvs_date_parse()
! 813: *
! 814: * Returns the number of seconds since the Epoch corresponding to the date.
! 815: */
1.1 jfb 816: time_t
1.7 jfb 817: cvs_date_parse(const char *p)
1.1 jfb 818: {
819: struct tm *tm, gmt;
1.7 jfb 820: struct timeb ftz, *now;
1.2 jfb 821: time_t Start, tod, nowtime;
1.7 jfb 822:
823: now = NULL;
1.1 jfb 824:
825: yyInput = p;
826: if (now == NULL) {
827: struct tm *gmt_ptr;
828:
829: now = &ftz;
1.8 ! jfb 830: (void)time(&nowtime);
1.1 jfb 831:
1.8 ! jfb 832: gmt_ptr = gmtime(&nowtime);
1.1 jfb 833: if (gmt_ptr != NULL) {
834: /* Make a copy, in case localtime modifies *tm (I think
835: * that comment now applies to *gmt_ptr, but I am too
836: * lazy to dig into how gmtime and locatime allocate the
837: * structures they return pointers to).
838: */
839: gmt = *gmt_ptr;
840: }
841:
1.8 ! jfb 842: if (!(tm = localtime(&nowtime)))
1.1 jfb 843: return (-1);
844:
845: if (gmt_ptr != NULL)
1.8 ! jfb 846: ftz.timezone = difftm(&gmt, tm) / 60;
1.1 jfb 847:
848: if(tm->tm_isdst)
849: ftz.timezone += 60;
850: }
851: else {
852: nowtime = now->time;
853: }
854:
855: tm = localtime(&nowtime);
856: yyYear = tm->tm_year + 1900;
857: yyMonth = tm->tm_mon + 1;
858: yyDay = tm->tm_mday;
859: yyTimezone = now->timezone;
860: yyDSTmode = DSTmaybe;
861: yyHour = 0;
862: yyMinutes = 0;
863: yySeconds = 0;
864: yyMeridian = MER24;
865: yyRelSeconds = 0;
866: yyRelMonth = 0;
867: yyHaveDate = 0;
868: yyHaveDay = 0;
869: yyHaveRel = 0;
870: yyHaveTime = 0;
871: yyHaveZone = 0;
872:
873: if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 ||
874: yyHaveDate > 1 || yyHaveDay > 1)
875: return (-1);
876:
877: if (yyHaveDate || yyHaveTime || yyHaveDay) {
878: Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes,
879: yySeconds, yyMeridian, yyDSTmode);
880: if (Start < 0)
881: return (-1);
882: } else {
883: Start = nowtime;
884: if (!yyHaveRel)
885: Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
886: }
887:
888: Start += yyRelSeconds;
889: Start += RelativeMonth(Start, yyRelMonth);
890:
891: if (yyHaveDay && !yyHaveDate) {
892: tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
893: Start += tod;
894: }
895:
896: /* Have to do *something* with a legitimate -1 so it's distinguishable
897: * from the error return value. (Alternately could set errno on error.)
898: */
899: return (Start == -1) ? (0) : (Start);
900: }
901:
902: #if defined(TEST)
903: /* ARGSUSED */
904: int
905: main(int argc, char **argv)
906: {
907: char buff[128];
908: time_t d;
909:
910: (void)printf("Enter date, or blank line to exit.\n\t> ");
911: (void)fflush(stdout);
912: while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
1.8 ! jfb 913: d = cvs_date_parse(buff);
1.1 jfb 914: if (d == -1)
915: (void)printf("Bad format - couldn't convert.\n");
916: else
917: (void)printf("%s", ctime(&d));
918: (void)printf("\t> ");
919: (void)fflush(stdout);
920: }
921:
922: return (0);
923: }
924: #endif /* defined(TEST) */