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1.1 jfb 1: %{
1.4 ! jfb 2: /* $OpenBSD: date.y,v 1.3 2005/03/24 15:40:43 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"
28:
1.3 jfb 29: #define YEAR_EPOCH 1970
30: #define YEAR_TMORIGIN 1900
1.1 jfb 31: #define HOUR(x) ((time_t)(x) * 60)
32: #define SECSPERDAY (24L * 60L * 60L)
33:
34:
35: /* An entry in the lexical lookup table */
36: typedef struct _TABLE {
37: char *name;
38: int type;
39: time_t value;
40: } TABLE;
41:
42:
1.4 ! jfb 43: /* Daylight-savings mode: on, off, or not yet known. */
1.1 jfb 44: typedef enum _DSTMODE {
45: DSTon, DSToff, DSTmaybe
46: } DSTMODE;
47:
1.4 ! jfb 48: /* Meridian: am, pm, or 24-hour style. */
1.1 jfb 49: typedef enum _MERIDIAN {
50: MERam, MERpm, MER24
51: } MERIDIAN;
52:
53:
54: /*
1.4 ! jfb 55: * Global variables. We could get rid of most of these by using a good
! 56: * union as the yacc stack. (This routine was originally written before
! 57: * yacc had the %union construct.) Maybe someday; right now we only use
! 58: * the %union very rarely.
! 59: */
1.1 jfb 60: static char *yyInput;
61: static DSTMODE yyDSTmode;
62: static time_t yyDayOrdinal;
63: static time_t yyDayNumber;
64: static int yyHaveDate;
65: static int yyHaveDay;
66: static int yyHaveRel;
67: static int yyHaveTime;
68: static int yyHaveZone;
69: static time_t yyTimezone;
70: static time_t yyDay;
71: static time_t yyHour;
72: static time_t yyMinutes;
73: static time_t yyMonth;
74: static time_t yySeconds;
75: static time_t yyYear;
76: static MERIDIAN yyMeridian;
77: static time_t yyRelMonth;
78: static time_t yyRelSeconds;
79:
1.2 jfb 80:
81: static int yyerror (const char *, ...);
82: static int yylex (void);
83: static int yyparse (void);
84:
85:
1.1 jfb 86: %}
87:
88: %union {
89: time_t Number;
90: enum _MERIDIAN Meridian;
91: }
92:
93: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
94: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
95:
96: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
97: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
98: %type <Meridian> tMERIDIAN o_merid
99:
100: %%
101:
102: spec : /* NULL */
103: | spec item
104: ;
105:
106: item : time {
1.3 jfb 107: yyHaveTime++;
1.1 jfb 108: }
109: | zone {
1.3 jfb 110: yyHaveZone++;
1.1 jfb 111: }
112: | date {
1.3 jfb 113: yyHaveDate++;
1.1 jfb 114: }
115: | day {
1.3 jfb 116: yyHaveDay++;
1.1 jfb 117: }
118: | rel {
1.3 jfb 119: yyHaveRel++;
1.1 jfb 120: }
121: | number
122: ;
123:
124: time : tUNUMBER tMERIDIAN {
1.3 jfb 125: yyHour = $1;
126: yyMinutes = 0;
127: yySeconds = 0;
128: yyMeridian = $2;
1.1 jfb 129: }
130: | tUNUMBER ':' tUNUMBER o_merid {
1.3 jfb 131: yyHour = $1;
132: yyMinutes = $3;
133: yySeconds = 0;
134: yyMeridian = $4;
1.1 jfb 135: }
136: | tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 jfb 137: yyHour = $1;
138: yyMinutes = $3;
139: yyMeridian = MER24;
140: yyDSTmode = DSToff;
141: yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
1.1 jfb 142: }
143: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
1.3 jfb 144: yyHour = $1;
145: yyMinutes = $3;
146: yySeconds = $5;
147: yyMeridian = $6;
1.1 jfb 148: }
149: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 jfb 150: yyHour = $1;
151: yyMinutes = $3;
152: yySeconds = $5;
153: yyMeridian = MER24;
154: yyDSTmode = DSToff;
155: yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
1.1 jfb 156: }
157: ;
158:
159: zone : tZONE {
1.3 jfb 160: yyTimezone = $1;
161: yyDSTmode = DSToff;
1.1 jfb 162: }
163: | tDAYZONE {
1.3 jfb 164: yyTimezone = $1;
165: yyDSTmode = DSTon;
1.1 jfb 166: }
1.3 jfb 167: | tZONE tDST {
168: yyTimezone = $1;
169: yyDSTmode = DSTon;
1.1 jfb 170: }
171: ;
172:
173: day : tDAY {
1.3 jfb 174: yyDayOrdinal = 1;
175: yyDayNumber = $1;
1.1 jfb 176: }
177: | tDAY ',' {
1.3 jfb 178: yyDayOrdinal = 1;
179: yyDayNumber = $1;
1.1 jfb 180: }
181: | tUNUMBER tDAY {
1.3 jfb 182: yyDayOrdinal = $1;
183: yyDayNumber = $2;
1.1 jfb 184: }
185: ;
186:
187: date : tUNUMBER '/' tUNUMBER {
1.3 jfb 188: yyMonth = $1;
189: yyDay = $3;
190: }
191: | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
192: if ($1 >= 100) {
193: yyYear = $1;
194: yyMonth = $3;
195: yyDay = $5;
196: } else {
1.1 jfb 197: yyMonth = $1;
198: yyDay = $3;
1.3 jfb 199: yyYear = $5;
200: }
1.1 jfb 201: }
1.3 jfb 202: | tUNUMBER tSNUMBER tSNUMBER {
203: /* ISO 8601 format. yyyy-mm-dd. */
1.1 jfb 204: yyYear = $1;
1.3 jfb 205: yyMonth = -$2;
206: yyDay = -$3;
1.1 jfb 207: }
208: | tUNUMBER tMONTH tSNUMBER {
1.3 jfb 209: /* e.g. 17-JUN-1992. */
210: yyDay = $1;
211: yyMonth = $2;
212: yyYear = -$3;
1.1 jfb 213: }
214: | tMONTH tUNUMBER {
1.3 jfb 215: yyMonth = $1;
216: yyDay = $2;
1.1 jfb 217: }
218: | tMONTH tUNUMBER ',' tUNUMBER {
1.3 jfb 219: yyMonth = $1;
220: yyDay = $2;
221: yyYear = $4;
1.1 jfb 222: }
223: | tUNUMBER tMONTH {
1.3 jfb 224: yyMonth = $2;
225: yyDay = $1;
1.1 jfb 226: }
227: | tUNUMBER tMONTH tUNUMBER {
1.3 jfb 228: yyMonth = $2;
229: yyDay = $1;
230: yyYear = $3;
1.1 jfb 231: }
232: ;
233:
234: rel : relunit tAGO {
1.3 jfb 235: yyRelSeconds = -yyRelSeconds;
236: yyRelMonth = -yyRelMonth;
1.1 jfb 237: }
238: | relunit
239: ;
240:
241: relunit : tUNUMBER tMINUTE_UNIT {
1.3 jfb 242: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 243: }
244: | tSNUMBER tMINUTE_UNIT {
1.3 jfb 245: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 246: }
247: | tMINUTE_UNIT {
1.3 jfb 248: yyRelSeconds += $1 * 60L;
1.1 jfb 249: }
250: | tSNUMBER tSEC_UNIT {
1.3 jfb 251: yyRelSeconds += $1;
1.1 jfb 252: }
253: | tUNUMBER tSEC_UNIT {
1.3 jfb 254: yyRelSeconds += $1;
1.1 jfb 255: }
256: | tSEC_UNIT {
1.3 jfb 257: yyRelSeconds++;
1.1 jfb 258: }
259: | tSNUMBER tMONTH_UNIT {
1.3 jfb 260: yyRelMonth += $1 * $2;
1.1 jfb 261: }
262: | tUNUMBER tMONTH_UNIT {
1.3 jfb 263: yyRelMonth += $1 * $2;
1.1 jfb 264: }
265: | tMONTH_UNIT {
1.3 jfb 266: yyRelMonth += $1;
1.1 jfb 267: }
268: ;
269:
270: number : tUNUMBER {
1.3 jfb 271: if (yyHaveTime && yyHaveDate && !yyHaveRel)
272: yyYear = $1;
273: else {
274: if ($1 > 10000) {
1.1 jfb 275: yyHaveDate++;
276: yyDay= ($1)%100;
277: yyMonth= ($1/100)%100;
278: yyYear = $1/10000;
1.3 jfb 279: } else {
1.1 jfb 280: yyHaveTime++;
281: if ($1 < 100) {
1.3 jfb 282: yyHour = $1;
283: yyMinutes = 0;
284: } else {
1.1 jfb 285: yyHour = $1 / 100;
286: yyMinutes = $1 % 100;
287: }
288: yySeconds = 0;
289: yyMeridian = MER24;
290: }
1.3 jfb 291: }
1.1 jfb 292: }
293: ;
294:
295: o_merid : /* NULL */ {
296: $$ = MER24;
297: }
298: | tMERIDIAN {
299: $$ = $1;
300: }
301: ;
302:
303: %%
304:
305: /* Month and day table. */
306: static TABLE const MonthDayTable[] = {
307: { "january", tMONTH, 1 },
308: { "february", tMONTH, 2 },
309: { "march", tMONTH, 3 },
310: { "april", tMONTH, 4 },
311: { "may", tMONTH, 5 },
312: { "june", tMONTH, 6 },
313: { "july", tMONTH, 7 },
314: { "august", tMONTH, 8 },
315: { "september", tMONTH, 9 },
316: { "sept", tMONTH, 9 },
317: { "october", tMONTH, 10 },
318: { "november", tMONTH, 11 },
319: { "december", tMONTH, 12 },
320: { "sunday", tDAY, 0 },
321: { "monday", tDAY, 1 },
322: { "tuesday", tDAY, 2 },
323: { "tues", tDAY, 2 },
324: { "wednesday", tDAY, 3 },
325: { "wednes", tDAY, 3 },
326: { "thursday", tDAY, 4 },
327: { "thur", tDAY, 4 },
328: { "thurs", tDAY, 4 },
329: { "friday", tDAY, 5 },
330: { "saturday", tDAY, 6 },
331: { NULL }
332: };
333:
334: /* Time units table. */
335: static TABLE const UnitsTable[] = {
336: { "year", tMONTH_UNIT, 12 },
337: { "month", tMONTH_UNIT, 1 },
338: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
339: { "week", tMINUTE_UNIT, 7 * 24 * 60 },
340: { "day", tMINUTE_UNIT, 1 * 24 * 60 },
341: { "hour", tMINUTE_UNIT, 60 },
342: { "minute", tMINUTE_UNIT, 1 },
343: { "min", tMINUTE_UNIT, 1 },
344: { "second", tSEC_UNIT, 1 },
345: { "sec", tSEC_UNIT, 1 },
346: { NULL }
347: };
348:
349: /* Assorted relative-time words. */
350: static TABLE const OtherTable[] = {
351: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
352: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
353: { "today", tMINUTE_UNIT, 0 },
354: { "now", tMINUTE_UNIT, 0 },
355: { "last", tUNUMBER, -1 },
356: { "this", tMINUTE_UNIT, 0 },
357: { "next", tUNUMBER, 2 },
358: { "first", tUNUMBER, 1 },
359: /* { "second", tUNUMBER, 2 }, */
360: { "third", tUNUMBER, 3 },
361: { "fourth", tUNUMBER, 4 },
362: { "fifth", tUNUMBER, 5 },
363: { "sixth", tUNUMBER, 6 },
364: { "seventh", tUNUMBER, 7 },
365: { "eighth", tUNUMBER, 8 },
366: { "ninth", tUNUMBER, 9 },
367: { "tenth", tUNUMBER, 10 },
368: { "eleventh", tUNUMBER, 11 },
369: { "twelfth", tUNUMBER, 12 },
370: { "ago", tAGO, 1 },
371: { NULL }
372: };
373:
374: /* The timezone table. */
375: /* Some of these are commented out because a time_t can't store a float. */
376: static TABLE const TimezoneTable[] = {
377: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
1.4 ! jfb 378: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
1.1 jfb 379: { "utc", tZONE, HOUR( 0) },
380: { "wet", tZONE, HOUR( 0) }, /* Western European */
381: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
382: { "wat", tZONE, HOUR( 1) }, /* West Africa */
1.4 ! jfb 383: { "at", tZONE, HOUR( 2) }, /* Azores */
1.1 jfb 384: #if 0
385: /* For completeness. BST is also British Summer, and GST is
386: * also Guam Standard. */
387: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
388: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
389: #endif
390: #if 0
391: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
392: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
393: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
394: #endif
395: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
396: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
397: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
398: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
399: { "cst", tZONE, HOUR( 6) }, /* Central Standard */
400: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
401: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
402: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
403: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
404: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
405: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
406: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
407: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
408: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
409: { "cat", tZONE, HOUR(10) }, /* Central Alaska */
410: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
1.4 ! jfb 411: { "nt", tZONE, HOUR(11) }, /* Nome */
1.1 jfb 412: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
413: { "cet", tZONE, -HOUR(1) }, /* Central European */
414: { "met", tZONE, -HOUR(1) }, /* Middle European */
415: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
416: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
417: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
418: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
419: { "fwt", tZONE, -HOUR(1) }, /* French Winter */
420: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
421: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
1.4 ! jfb 422: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
1.1 jfb 423: #if 0
1.4 ! jfb 424: { "it", tZONE, -HOUR(3.5) },/* Iran */
1.1 jfb 425: #endif
426: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
427: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
428: #if 0
429: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
430: #endif
431: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
432: #if 0
433: /* For completeness. NST is also Newfoundland Stanard, and SST is
434: * also Swedish Summer. */
435: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
436: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
437: #endif /* 0 */
438: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
439: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
440: #if 0
1.4 ! jfb 441: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
1.1 jfb 442: #endif
443: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
444: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
445: #if 0
446: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
447: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
448: #endif
449: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
450: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
451: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
452: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
453: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
454: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
455: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
456: { NULL }
457: };
458:
459: /* Military timezone table. */
460: static TABLE const MilitaryTable[] = {
461: { "a", tZONE, HOUR( 1) },
462: { "b", tZONE, HOUR( 2) },
463: { "c", tZONE, HOUR( 3) },
464: { "d", tZONE, HOUR( 4) },
465: { "e", tZONE, HOUR( 5) },
466: { "f", tZONE, HOUR( 6) },
467: { "g", tZONE, HOUR( 7) },
468: { "h", tZONE, HOUR( 8) },
469: { "i", tZONE, HOUR( 9) },
470: { "k", tZONE, HOUR( 10) },
471: { "l", tZONE, HOUR( 11) },
472: { "m", tZONE, HOUR( 12) },
473: { "n", tZONE, HOUR(- 1) },
474: { "o", tZONE, HOUR(- 2) },
475: { "p", tZONE, HOUR(- 3) },
476: { "q", tZONE, HOUR(- 4) },
477: { "r", tZONE, HOUR(- 5) },
478: { "s", tZONE, HOUR(- 6) },
479: { "t", tZONE, HOUR(- 7) },
480: { "u", tZONE, HOUR(- 8) },
481: { "v", tZONE, HOUR(- 9) },
482: { "w", tZONE, HOUR(-10) },
483: { "x", tZONE, HOUR(-11) },
484: { "y", tZONE, HOUR(-12) },
485: { "z", tZONE, HOUR( 0) },
486: { NULL }
487: };
488:
489:
490: /* ARGSUSED */
491: static int
1.2 jfb 492: yyerror(const char *fmt, ...)
1.1 jfb 493: {
1.2 jfb 494: va_list vap;
495:
496: va_start(vap, fmt);
497: cvs_vlog(LP_ERR, fmt, vap);
498: va_end(vap);
499:
1.1 jfb 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;
1.3 jfb 556: if (Year < YEAR_EPOCH)
1.1 jfb 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. */
1.3 jfb 563: if (Year < YEAR_EPOCH || Year > 2038 || Month < 1 || Month > 12 ||
1.1 jfb 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:
1.3 jfb 571: for (i = YEAR_EPOCH; i < Year; i++)
1.1 jfb 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: LookupWord(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 LookupWord(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
1.3 jfb 788: difftm(struct tm *a, struct tm *b)
1.1 jfb 789: {
1.3 jfb 790: int ay = a->tm_year + (YEAR_TMORIGIN - 1);
791: int by = b->tm_year + (YEAR_TMORIGIN - 1);
1.1 jfb 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: );
802: return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
803: + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec));
804: }
805:
806: time_t
807: get_date(char *p, struct timeb *now)
808: {
809: struct tm *tm, gmt;
810: struct timeb ftz;
1.2 jfb 811: time_t Start, tod, nowtime;
1.1 jfb 812:
813: yyInput = p;
814: if (now == NULL) {
815: struct tm *gmt_ptr;
816:
817: now = &ftz;
818: (void)time (&nowtime);
819:
820: gmt_ptr = gmtime (&nowtime);
821: if (gmt_ptr != NULL) {
822: /* Make a copy, in case localtime modifies *tm (I think
823: * that comment now applies to *gmt_ptr, but I am too
824: * lazy to dig into how gmtime and locatime allocate the
825: * structures they return pointers to).
826: */
827: gmt = *gmt_ptr;
828: }
829:
830: if (!(tm = localtime (&nowtime)))
831: return (-1);
832:
833: if (gmt_ptr != NULL)
834: ftz.timezone = difftm (&gmt, tm) / 60;
835: else
836: /* We are on a system like VMS, where the system clock is
837: in local time and the system has no concept of timezones.
838: Hopefully we can fake this out (for the case in which the
839: user specifies no timezone) by just saying the timezone
840: is zero. */
841: ftz.timezone = 0;
842:
843: if(tm->tm_isdst)
844: ftz.timezone += 60;
845: }
846: else {
847: nowtime = now->time;
848: }
849:
850: tm = localtime(&nowtime);
851: yyYear = tm->tm_year + 1900;
852: yyMonth = tm->tm_mon + 1;
853: yyDay = tm->tm_mday;
854: yyTimezone = now->timezone;
855: yyDSTmode = DSTmaybe;
856: yyHour = 0;
857: yyMinutes = 0;
858: yySeconds = 0;
859: yyMeridian = MER24;
860: yyRelSeconds = 0;
861: yyRelMonth = 0;
862: yyHaveDate = 0;
863: yyHaveDay = 0;
864: yyHaveRel = 0;
865: yyHaveTime = 0;
866: yyHaveZone = 0;
867:
868: if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 ||
869: yyHaveDate > 1 || yyHaveDay > 1)
870: return (-1);
871:
872: if (yyHaveDate || yyHaveTime || yyHaveDay) {
873: Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes,
874: yySeconds, yyMeridian, yyDSTmode);
875: if (Start < 0)
876: return (-1);
877: } else {
878: Start = nowtime;
879: if (!yyHaveRel)
880: Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
881: }
882:
883: Start += yyRelSeconds;
884: Start += RelativeMonth(Start, yyRelMonth);
885:
886: if (yyHaveDay && !yyHaveDate) {
887: tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
888: Start += tod;
889: }
890:
891: /* Have to do *something* with a legitimate -1 so it's distinguishable
892: * from the error return value. (Alternately could set errno on error.)
893: */
894: return (Start == -1) ? (0) : (Start);
895: }
896:
897: #if defined(TEST)
898: /* ARGSUSED */
899: int
900: main(int argc, char **argv)
901: {
902: char buff[128];
903: time_t d;
904:
905: (void)printf("Enter date, or blank line to exit.\n\t> ");
906: (void)fflush(stdout);
907: while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
908: d = get_date(buff, (struct timeb *)NULL);
909: if (d == -1)
910: (void)printf("Bad format - couldn't convert.\n");
911: else
912: (void)printf("%s", ctime(&d));
913: (void)printf("\t> ");
914: (void)fflush(stdout);
915: }
916:
917: return (0);
918: }
919: #endif /* defined(TEST) */