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1.1 jfb 1: %{
1.3 ! jfb 2: /* $OpenBSD: date.y,v 1.2 2005/03/24 03:07:04 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:
43: /*
44: ** Daylight-savings mode: on, off, or not yet known.
45: */
46: typedef enum _DSTMODE {
47: DSTon, DSToff, DSTmaybe
48: } DSTMODE;
49:
50: /*
51: ** Meridian: am, pm, or 24-hour style.
52: */
53: typedef enum _MERIDIAN {
54: MERam, MERpm, MER24
55: } MERIDIAN;
56:
57:
58: /*
59: ** Global variables. We could get rid of most of these by using a good
60: ** union as the yacc stack. (This routine was originally written before
61: ** yacc had the %union construct.) Maybe someday; right now we only use
62: ** the %union very rarely.
63: */
64: static char *yyInput;
65: static DSTMODE yyDSTmode;
66: static time_t yyDayOrdinal;
67: static time_t yyDayNumber;
68: static int yyHaveDate;
69: static int yyHaveDay;
70: static int yyHaveRel;
71: static int yyHaveTime;
72: static int yyHaveZone;
73: static time_t yyTimezone;
74: static time_t yyDay;
75: static time_t yyHour;
76: static time_t yyMinutes;
77: static time_t yyMonth;
78: static time_t yySeconds;
79: static time_t yyYear;
80: static MERIDIAN yyMeridian;
81: static time_t yyRelMonth;
82: static time_t yyRelSeconds;
83:
1.2 jfb 84:
85: static int yyerror (const char *, ...);
86: static int yylex (void);
87: static int yyparse (void);
88:
89:
1.1 jfb 90: %}
91:
92: %union {
93: time_t Number;
94: enum _MERIDIAN Meridian;
95: }
96:
97: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
98: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
99:
100: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
101: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
102: %type <Meridian> tMERIDIAN o_merid
103:
104: %%
105:
106: spec : /* NULL */
107: | spec item
108: ;
109:
110: item : time {
1.3 ! jfb 111: yyHaveTime++;
1.1 jfb 112: }
113: | zone {
1.3 ! jfb 114: yyHaveZone++;
1.1 jfb 115: }
116: | date {
1.3 ! jfb 117: yyHaveDate++;
1.1 jfb 118: }
119: | day {
1.3 ! jfb 120: yyHaveDay++;
1.1 jfb 121: }
122: | rel {
1.3 ! jfb 123: yyHaveRel++;
1.1 jfb 124: }
125: | number
126: ;
127:
128: time : tUNUMBER tMERIDIAN {
1.3 ! jfb 129: yyHour = $1;
! 130: yyMinutes = 0;
! 131: yySeconds = 0;
! 132: yyMeridian = $2;
1.1 jfb 133: }
134: | tUNUMBER ':' tUNUMBER o_merid {
1.3 ! jfb 135: yyHour = $1;
! 136: yyMinutes = $3;
! 137: yySeconds = 0;
! 138: yyMeridian = $4;
1.1 jfb 139: }
140: | tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 ! jfb 141: yyHour = $1;
! 142: yyMinutes = $3;
! 143: yyMeridian = MER24;
! 144: yyDSTmode = DSToff;
! 145: yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
1.1 jfb 146: }
147: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
1.3 ! jfb 148: yyHour = $1;
! 149: yyMinutes = $3;
! 150: yySeconds = $5;
! 151: yyMeridian = $6;
1.1 jfb 152: }
153: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 ! jfb 154: yyHour = $1;
! 155: yyMinutes = $3;
! 156: yySeconds = $5;
! 157: yyMeridian = MER24;
! 158: yyDSTmode = DSToff;
! 159: yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
1.1 jfb 160: }
161: ;
162:
163: zone : tZONE {
1.3 ! jfb 164: yyTimezone = $1;
! 165: yyDSTmode = DSToff;
1.1 jfb 166: }
167: | tDAYZONE {
1.3 ! jfb 168: yyTimezone = $1;
! 169: yyDSTmode = DSTon;
1.1 jfb 170: }
1.3 ! jfb 171: | tZONE tDST {
! 172: yyTimezone = $1;
! 173: yyDSTmode = DSTon;
1.1 jfb 174: }
175: ;
176:
177: day : tDAY {
1.3 ! jfb 178: yyDayOrdinal = 1;
! 179: yyDayNumber = $1;
1.1 jfb 180: }
181: | tDAY ',' {
1.3 ! jfb 182: yyDayOrdinal = 1;
! 183: yyDayNumber = $1;
1.1 jfb 184: }
185: | tUNUMBER tDAY {
1.3 ! jfb 186: yyDayOrdinal = $1;
! 187: yyDayNumber = $2;
1.1 jfb 188: }
189: ;
190:
191: date : tUNUMBER '/' tUNUMBER {
1.3 ! jfb 192: yyMonth = $1;
! 193: yyDay = $3;
! 194: }
! 195: | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
! 196: if ($1 >= 100) {
! 197: yyYear = $1;
! 198: yyMonth = $3;
! 199: yyDay = $5;
! 200: } else {
1.1 jfb 201: yyMonth = $1;
202: yyDay = $3;
1.3 ! jfb 203: yyYear = $5;
! 204: }
1.1 jfb 205: }
1.3 ! jfb 206: | tUNUMBER tSNUMBER tSNUMBER {
! 207: /* ISO 8601 format. yyyy-mm-dd. */
1.1 jfb 208: yyYear = $1;
1.3 ! jfb 209: yyMonth = -$2;
! 210: yyDay = -$3;
1.1 jfb 211: }
212: | tUNUMBER tMONTH tSNUMBER {
1.3 ! jfb 213: /* e.g. 17-JUN-1992. */
! 214: yyDay = $1;
! 215: yyMonth = $2;
! 216: yyYear = -$3;
1.1 jfb 217: }
218: | tMONTH tUNUMBER {
1.3 ! jfb 219: yyMonth = $1;
! 220: yyDay = $2;
1.1 jfb 221: }
222: | tMONTH tUNUMBER ',' tUNUMBER {
1.3 ! jfb 223: yyMonth = $1;
! 224: yyDay = $2;
! 225: yyYear = $4;
1.1 jfb 226: }
227: | tUNUMBER tMONTH {
1.3 ! jfb 228: yyMonth = $2;
! 229: yyDay = $1;
1.1 jfb 230: }
231: | tUNUMBER tMONTH tUNUMBER {
1.3 ! jfb 232: yyMonth = $2;
! 233: yyDay = $1;
! 234: yyYear = $3;
1.1 jfb 235: }
236: ;
237:
238: rel : relunit tAGO {
1.3 ! jfb 239: yyRelSeconds = -yyRelSeconds;
! 240: yyRelMonth = -yyRelMonth;
1.1 jfb 241: }
242: | relunit
243: ;
244:
245: relunit : tUNUMBER tMINUTE_UNIT {
1.3 ! jfb 246: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 247: }
248: | tSNUMBER tMINUTE_UNIT {
1.3 ! jfb 249: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 250: }
251: | tMINUTE_UNIT {
1.3 ! jfb 252: yyRelSeconds += $1 * 60L;
1.1 jfb 253: }
254: | tSNUMBER tSEC_UNIT {
1.3 ! jfb 255: yyRelSeconds += $1;
1.1 jfb 256: }
257: | tUNUMBER tSEC_UNIT {
1.3 ! jfb 258: yyRelSeconds += $1;
1.1 jfb 259: }
260: | tSEC_UNIT {
1.3 ! jfb 261: yyRelSeconds++;
1.1 jfb 262: }
263: | tSNUMBER tMONTH_UNIT {
1.3 ! jfb 264: yyRelMonth += $1 * $2;
1.1 jfb 265: }
266: | tUNUMBER tMONTH_UNIT {
1.3 ! jfb 267: yyRelMonth += $1 * $2;
1.1 jfb 268: }
269: | tMONTH_UNIT {
1.3 ! jfb 270: yyRelMonth += $1;
1.1 jfb 271: }
272: ;
273:
274: number : tUNUMBER {
1.3 ! jfb 275: if (yyHaveTime && yyHaveDate && !yyHaveRel)
! 276: yyYear = $1;
! 277: else {
! 278: if ($1 > 10000) {
1.1 jfb 279: yyHaveDate++;
280: yyDay= ($1)%100;
281: yyMonth= ($1/100)%100;
282: yyYear = $1/10000;
1.3 ! jfb 283: } else {
1.1 jfb 284: yyHaveTime++;
285: if ($1 < 100) {
1.3 ! jfb 286: yyHour = $1;
! 287: yyMinutes = 0;
! 288: } else {
1.1 jfb 289: yyHour = $1 / 100;
290: yyMinutes = $1 % 100;
291: }
292: yySeconds = 0;
293: yyMeridian = MER24;
294: }
1.3 ! jfb 295: }
1.1 jfb 296: }
297: ;
298:
299: o_merid : /* NULL */ {
300: $$ = MER24;
301: }
302: | tMERIDIAN {
303: $$ = $1;
304: }
305: ;
306:
307: %%
308:
309: /* Month and day table. */
310: static TABLE const MonthDayTable[] = {
311: { "january", tMONTH, 1 },
312: { "february", tMONTH, 2 },
313: { "march", tMONTH, 3 },
314: { "april", tMONTH, 4 },
315: { "may", tMONTH, 5 },
316: { "june", tMONTH, 6 },
317: { "july", tMONTH, 7 },
318: { "august", tMONTH, 8 },
319: { "september", tMONTH, 9 },
320: { "sept", tMONTH, 9 },
321: { "october", tMONTH, 10 },
322: { "november", tMONTH, 11 },
323: { "december", tMONTH, 12 },
324: { "sunday", tDAY, 0 },
325: { "monday", tDAY, 1 },
326: { "tuesday", tDAY, 2 },
327: { "tues", tDAY, 2 },
328: { "wednesday", tDAY, 3 },
329: { "wednes", tDAY, 3 },
330: { "thursday", tDAY, 4 },
331: { "thur", tDAY, 4 },
332: { "thurs", tDAY, 4 },
333: { "friday", tDAY, 5 },
334: { "saturday", tDAY, 6 },
335: { NULL }
336: };
337:
338: /* Time units table. */
339: static TABLE const UnitsTable[] = {
340: { "year", tMONTH_UNIT, 12 },
341: { "month", tMONTH_UNIT, 1 },
342: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
343: { "week", tMINUTE_UNIT, 7 * 24 * 60 },
344: { "day", tMINUTE_UNIT, 1 * 24 * 60 },
345: { "hour", tMINUTE_UNIT, 60 },
346: { "minute", tMINUTE_UNIT, 1 },
347: { "min", tMINUTE_UNIT, 1 },
348: { "second", tSEC_UNIT, 1 },
349: { "sec", tSEC_UNIT, 1 },
350: { NULL }
351: };
352:
353: /* Assorted relative-time words. */
354: static TABLE const OtherTable[] = {
355: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
356: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
357: { "today", tMINUTE_UNIT, 0 },
358: { "now", tMINUTE_UNIT, 0 },
359: { "last", tUNUMBER, -1 },
360: { "this", tMINUTE_UNIT, 0 },
361: { "next", tUNUMBER, 2 },
362: { "first", tUNUMBER, 1 },
363: /* { "second", tUNUMBER, 2 }, */
364: { "third", tUNUMBER, 3 },
365: { "fourth", tUNUMBER, 4 },
366: { "fifth", tUNUMBER, 5 },
367: { "sixth", tUNUMBER, 6 },
368: { "seventh", tUNUMBER, 7 },
369: { "eighth", tUNUMBER, 8 },
370: { "ninth", tUNUMBER, 9 },
371: { "tenth", tUNUMBER, 10 },
372: { "eleventh", tUNUMBER, 11 },
373: { "twelfth", tUNUMBER, 12 },
374: { "ago", tAGO, 1 },
375: { NULL }
376: };
377:
378: /* The timezone table. */
379: /* Some of these are commented out because a time_t can't store a float. */
380: static TABLE const TimezoneTable[] = {
381: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
382: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
383: { "utc", tZONE, HOUR( 0) },
384: { "wet", tZONE, HOUR( 0) }, /* Western European */
385: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
386: { "wat", tZONE, HOUR( 1) }, /* West Africa */
387: { "at", tZONE, HOUR( 2) }, /* Azores */
388: #if 0
389: /* For completeness. BST is also British Summer, and GST is
390: * also Guam Standard. */
391: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
392: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
393: #endif
394: #if 0
395: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
396: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
397: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
398: #endif
399: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
400: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
401: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
402: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
403: { "cst", tZONE, HOUR( 6) }, /* Central Standard */
404: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
405: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
406: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
407: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
408: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
409: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
410: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
411: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
412: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
413: { "cat", tZONE, HOUR(10) }, /* Central Alaska */
414: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
415: { "nt", tZONE, HOUR(11) }, /* Nome */
416: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
417: { "cet", tZONE, -HOUR(1) }, /* Central European */
418: { "met", tZONE, -HOUR(1) }, /* Middle European */
419: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
420: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
421: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
422: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
423: { "fwt", tZONE, -HOUR(1) }, /* French Winter */
424: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
425: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
426: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
427: #if 0
428: { "it", tZONE, -HOUR(3.5) },/* Iran */
429: #endif
430: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
431: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
432: #if 0
433: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
434: #endif
435: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
436: #if 0
437: /* For completeness. NST is also Newfoundland Stanard, and SST is
438: * also Swedish Summer. */
439: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
440: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
441: #endif /* 0 */
442: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
443: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
444: #if 0
445: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
446: #endif
447: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
448: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
449: #if 0
450: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
451: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
452: #endif
453: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
454: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
455: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
456: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
457: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
458: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
459: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
460: { NULL }
461: };
462:
463: /* Military timezone table. */
464: static TABLE const MilitaryTable[] = {
465: { "a", tZONE, HOUR( 1) },
466: { "b", tZONE, HOUR( 2) },
467: { "c", tZONE, HOUR( 3) },
468: { "d", tZONE, HOUR( 4) },
469: { "e", tZONE, HOUR( 5) },
470: { "f", tZONE, HOUR( 6) },
471: { "g", tZONE, HOUR( 7) },
472: { "h", tZONE, HOUR( 8) },
473: { "i", tZONE, HOUR( 9) },
474: { "k", tZONE, HOUR( 10) },
475: { "l", tZONE, HOUR( 11) },
476: { "m", tZONE, HOUR( 12) },
477: { "n", tZONE, HOUR(- 1) },
478: { "o", tZONE, HOUR(- 2) },
479: { "p", tZONE, HOUR(- 3) },
480: { "q", tZONE, HOUR(- 4) },
481: { "r", tZONE, HOUR(- 5) },
482: { "s", tZONE, HOUR(- 6) },
483: { "t", tZONE, HOUR(- 7) },
484: { "u", tZONE, HOUR(- 8) },
485: { "v", tZONE, HOUR(- 9) },
486: { "w", tZONE, HOUR(-10) },
487: { "x", tZONE, HOUR(-11) },
488: { "y", tZONE, HOUR(-12) },
489: { "z", tZONE, HOUR( 0) },
490: { NULL }
491: };
492:
493:
494: /* ARGSUSED */
495: static int
1.2 jfb 496: yyerror(const char *fmt, ...)
1.1 jfb 497: {
1.2 jfb 498: va_list vap;
499:
500: va_start(vap, fmt);
501: cvs_vlog(LP_ERR, fmt, vap);
502: va_end(vap);
503:
1.1 jfb 504: return (0);
505: }
506:
507:
508: static time_t
509: ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
510: {
511: if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
512: return (-1);
513:
514: switch (Meridian) {
515: case MER24:
516: if (Hours < 0 || Hours > 23)
517: return (-1);
518: return (Hours * 60L + Minutes) * 60L + Seconds;
519: case MERam:
520: if (Hours < 1 || Hours > 12)
521: return (-1);
522: if (Hours == 12)
523: Hours = 0;
524: return (Hours * 60L + Minutes) * 60L + Seconds;
525: case MERpm:
526: if (Hours < 1 || Hours > 12)
527: return (-1);
528: if (Hours == 12)
529: Hours = 0;
530: return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
531: default:
532: abort ();
533: }
534: /* NOTREACHED */
535: }
536:
537:
538: /* Year is either
539: * A negative number, which means to use its absolute value (why?)
540: * A number from 0 to 99, which means a year from 1900 to 1999, or
541: * The actual year (>=100).
542: */
543: static time_t
544: Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes,
545: time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode)
546: {
547: static int DaysInMonth[12] = {
548: 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
549: };
550: time_t tod;
551: time_t julian;
552: int i;
553:
554: if (Year < 0)
555: Year = -Year;
556: if (Year < 69)
557: Year += 2000;
558: else if (Year < 100) {
559: Year += 1900;
1.3 ! jfb 560: if (Year < YEAR_EPOCH)
1.1 jfb 561: Year += 100;
562: }
563: DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
564: ? 29 : 28;
565: /* Checking for 2038 bogusly assumes that time_t is 32 bits. But
566: I'm too lazy to try to check for time_t overflow in another way. */
1.3 ! jfb 567: if (Year < YEAR_EPOCH || Year > 2038 || Month < 1 || Month > 12 ||
1.1 jfb 568: /* Lint fluff: "conversion from long may lose accuracy" */
569: Day < 1 || Day > DaysInMonth[(int)--Month])
570: return (-1);
571:
572: for (julian = Day - 1, i = 0; i < Month; i++)
573: julian += DaysInMonth[i];
574:
1.3 ! jfb 575: for (i = YEAR_EPOCH; i < Year; i++)
1.1 jfb 576: julian += 365 + (i % 4 == 0);
577: julian *= SECSPERDAY;
578: julian += yyTimezone * 60L;
579:
580: if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
581: return (-1);
582: julian += tod;
583: if ((DSTmode == DSTon) ||
584: (DSTmode == DSTmaybe && localtime(&julian)->tm_isdst))
585: julian -= 60 * 60;
586: return (julian);
587: }
588:
589:
590: static time_t
591: DSTcorrect(time_t Start, time_t Future)
592: {
593: time_t StartDay;
594: time_t FutureDay;
595:
596: StartDay = (localtime(&Start)->tm_hour + 1) % 24;
597: FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
598: return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
599: }
600:
601:
602: static time_t
603: RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber)
604: {
605: struct tm *tm;
606: time_t now;
607:
608: now = Start;
609: tm = localtime(&now);
610: now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
611: now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
612: return DSTcorrect(Start, now);
613: }
614:
615:
616: static time_t
617: RelativeMonth(time_t Start, time_t RelMonth)
618: {
619: struct tm *tm;
620: time_t Month;
621: time_t Year;
622:
623: if (RelMonth == 0)
624: return (0);
625: tm = localtime(&Start);
626: Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth;
627: Year = Month / 12;
628: Month = Month % 12 + 1;
629: return DSTcorrect(Start,
630: Convert(Month, (time_t)tm->tm_mday, Year,
631: (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
632: MER24, DSTmaybe));
633: }
634:
635:
636: static int
637: LookupWord(char *buff)
638: {
639: char *p, *q;
640: int i, abbrev;
641: const TABLE *tp;
642:
643: /* Make it lowercase. */
644: for (p = buff; *p; p++)
645: if (isupper(*p))
646: *p = tolower(*p);
647:
648: if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
649: yylval.Meridian = MERam;
650: return (tMERIDIAN);
651: }
652: if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
653: yylval.Meridian = MERpm;
654: return (tMERIDIAN);
655: }
656:
657: /* See if we have an abbreviation for a month. */
658: if (strlen(buff) == 3)
659: abbrev = 1;
660: else if (strlen(buff) == 4 && buff[3] == '.') {
661: abbrev = 1;
662: buff[3] = '\0';
663: } else
664: abbrev = 0;
665:
666: for (tp = MonthDayTable; tp->name; tp++) {
667: if (abbrev) {
668: if (strncmp(buff, tp->name, 3) == 0) {
669: yylval.Number = tp->value;
670: return (tp->type);
671: }
672: } else if (strcmp(buff, tp->name) == 0) {
673: yylval.Number = tp->value;
674: return (tp->type);
675: }
676: }
677:
678: for (tp = TimezoneTable; tp->name; tp++)
679: if (strcmp(buff, tp->name) == 0) {
680: yylval.Number = tp->value;
681: return (tp->type);
682: }
683:
684: if (strcmp(buff, "dst") == 0)
685: return (tDST);
686:
687: for (tp = UnitsTable; tp->name; tp++)
688: if (strcmp(buff, tp->name) == 0) {
689: yylval.Number = tp->value;
690: return (tp->type);
691: }
692:
693: /* Strip off any plural and try the units table again. */
694: i = strlen(buff) - 1;
695: if (buff[i] == 's') {
696: buff[i] = '\0';
697: for (tp = UnitsTable; tp->name; tp++)
698: if (strcmp(buff, tp->name) == 0) {
699: yylval.Number = tp->value;
700: return (tp->type);
701: }
702: buff[i] = 's'; /* Put back for "this" in OtherTable. */
703: }
704:
705: for (tp = OtherTable; tp->name; tp++)
706: if (strcmp(buff, tp->name) == 0) {
707: yylval.Number = tp->value;
708: return (tp->type);
709: }
710:
711: /* Military timezones. */
712: if (buff[1] == '\0' && isalpha(*buff)) {
713: for (tp = MilitaryTable; tp->name; tp++)
714: if (strcmp(buff, tp->name) == 0) {
715: yylval.Number = tp->value;
716: return (tp->type);
717: }
718: }
719:
720: /* Drop out any periods and try the timezone table again. */
721: for (i = 0, p = q = buff; *q; q++)
722: if (*q != '.')
723: *p++ = *q;
724: else
725: i++;
726: *p = '\0';
727: if (i)
728: for (tp = TimezoneTable; tp->name; tp++)
729: if (strcmp(buff, tp->name) == 0) {
730: yylval.Number = tp->value;
731: return (tp->type);
732: }
733:
734: return (tID);
735: }
736:
737:
738: static int
739: yylex(void)
740: {
741: char c, *p, buff[20];
742: int count, sign;
743:
744: for (;;) {
745: while (isspace(*yyInput))
746: yyInput++;
747:
748: if (isdigit(c = *yyInput) || c == '-' || c == '+') {
749: if (c == '-' || c == '+') {
750: sign = c == '-' ? -1 : 1;
751: if (!isdigit(*++yyInput))
752: /* skip the '-' sign */
753: continue;
754: }
755: else
756: sign = 0;
757:
758: for (yylval.Number = 0; isdigit(c = *yyInput++); )
759: yylval.Number = 10 * yylval.Number + c - '0';
760: yyInput--;
761: if (sign < 0)
762: yylval.Number = -yylval.Number;
763: return sign ? tSNUMBER : tUNUMBER;
764: }
765:
766: if (isalpha(c)) {
767: for (p = buff; isalpha(c = *yyInput++) || c == '.'; )
768: if (p < &buff[sizeof buff - 1])
769: *p++ = c;
770: *p = '\0';
771: yyInput--;
772: return LookupWord(buff);
773: }
774: if (c != '(')
775: return *yyInput++;
776:
777: count = 0;
778: do {
779: c = *yyInput++;
780: if (c == '\0')
781: return (c);
782: if (c == '(')
783: count++;
784: else if (c == ')')
785: count--;
786: } while (count > 0);
787: }
788: }
789:
790: /* Yield A - B, measured in seconds. */
791: static long
1.3 ! jfb 792: difftm(struct tm *a, struct tm *b)
1.1 jfb 793: {
1.3 ! jfb 794: int ay = a->tm_year + (YEAR_TMORIGIN - 1);
! 795: int by = b->tm_year + (YEAR_TMORIGIN - 1);
1.1 jfb 796: int days = (
797: /* difference in day of year */
798: a->tm_yday - b->tm_yday
799: /* + intervening leap days */
800: + ((ay >> 2) - (by >> 2))
801: - (ay/100 - by/100)
802: + ((ay/100 >> 2) - (by/100 >> 2))
803: /* + difference in years * 365 */
804: + (long)(ay-by) * 365
805: );
806: return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
807: + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec));
808: }
809:
810: time_t
811: get_date(char *p, struct timeb *now)
812: {
813: struct tm *tm, gmt;
814: struct timeb ftz;
1.2 jfb 815: time_t Start, tod, nowtime;
1.1 jfb 816:
817: yyInput = p;
818: if (now == NULL) {
819: struct tm *gmt_ptr;
820:
821: now = &ftz;
822: (void)time (&nowtime);
823:
824: gmt_ptr = gmtime (&nowtime);
825: if (gmt_ptr != NULL) {
826: /* Make a copy, in case localtime modifies *tm (I think
827: * that comment now applies to *gmt_ptr, but I am too
828: * lazy to dig into how gmtime and locatime allocate the
829: * structures they return pointers to).
830: */
831: gmt = *gmt_ptr;
832: }
833:
834: if (!(tm = localtime (&nowtime)))
835: return (-1);
836:
837: if (gmt_ptr != NULL)
838: ftz.timezone = difftm (&gmt, tm) / 60;
839: else
840: /* We are on a system like VMS, where the system clock is
841: in local time and the system has no concept of timezones.
842: Hopefully we can fake this out (for the case in which the
843: user specifies no timezone) by just saying the timezone
844: is zero. */
845: ftz.timezone = 0;
846:
847: if(tm->tm_isdst)
848: ftz.timezone += 60;
849: }
850: else {
851: nowtime = now->time;
852: }
853:
854: tm = localtime(&nowtime);
855: yyYear = tm->tm_year + 1900;
856: yyMonth = tm->tm_mon + 1;
857: yyDay = tm->tm_mday;
858: yyTimezone = now->timezone;
859: yyDSTmode = DSTmaybe;
860: yyHour = 0;
861: yyMinutes = 0;
862: yySeconds = 0;
863: yyMeridian = MER24;
864: yyRelSeconds = 0;
865: yyRelMonth = 0;
866: yyHaveDate = 0;
867: yyHaveDay = 0;
868: yyHaveRel = 0;
869: yyHaveTime = 0;
870: yyHaveZone = 0;
871:
872: if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 ||
873: yyHaveDate > 1 || yyHaveDay > 1)
874: return (-1);
875:
876: if (yyHaveDate || yyHaveTime || yyHaveDay) {
877: Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes,
878: yySeconds, yyMeridian, yyDSTmode);
879: if (Start < 0)
880: return (-1);
881: } else {
882: Start = nowtime;
883: if (!yyHaveRel)
884: Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
885: }
886:
887: Start += yyRelSeconds;
888: Start += RelativeMonth(Start, yyRelMonth);
889:
890: if (yyHaveDay && !yyHaveDate) {
891: tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
892: Start += tod;
893: }
894:
895: /* Have to do *something* with a legitimate -1 so it's distinguishable
896: * from the error return value. (Alternately could set errno on error.)
897: */
898: return (Start == -1) ? (0) : (Start);
899: }
900:
901: #if defined(TEST)
902: /* ARGSUSED */
903: int
904: main(int argc, char **argv)
905: {
906: char buff[128];
907: time_t d;
908:
909: (void)printf("Enter date, or blank line to exit.\n\t> ");
910: (void)fflush(stdout);
911: while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
912: d = get_date(buff, (struct timeb *)NULL);
913: if (d == -1)
914: (void)printf("Bad format - couldn't convert.\n");
915: else
916: (void)printf("%s", ctime(&d));
917: (void)printf("\t> ");
918: (void)fflush(stdout);
919: }
920:
921: return (0);
922: }
923: #endif /* defined(TEST) */