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1.1 jfb 1: %{
1.19 ! ray 2: /* $OpenBSD: date.y,v 1.18 2008/02/16 01:00:00 cnst 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:
1.16 otto 17: #include <sys/timeb.h>
18:
19: #include <ctype.h>
20: #include <string.h>
1.1 jfb 21:
1.7 jfb 22: #include "cvs.h"
1.1 jfb 23:
1.3 jfb 24: #define YEAR_EPOCH 1970
25: #define YEAR_TMORIGIN 1900
1.1 jfb 26: #define HOUR(x) ((time_t)(x) * 60)
27: #define SECSPERDAY (24L * 60L * 60L)
28:
29:
30: /* An entry in the lexical lookup table */
31: typedef struct _TABLE {
32: char *name;
33: int type;
34: time_t value;
35: } TABLE;
36:
37:
1.4 jfb 38: /* Daylight-savings mode: on, off, or not yet known. */
1.1 jfb 39: typedef enum _DSTMODE {
40: DSTon, DSToff, DSTmaybe
41: } DSTMODE;
42:
1.4 jfb 43: /* Meridian: am, pm, or 24-hour style. */
1.1 jfb 44: typedef enum _MERIDIAN {
45: MERam, MERpm, MER24
46: } MERIDIAN;
47:
48:
49: /*
1.4 jfb 50: * Global variables. We could get rid of most of these by using a good
51: * union as the yacc stack. (This routine was originally written before
52: * yacc had the %union construct.) Maybe someday; right now we only use
53: * the %union very rarely.
54: */
1.7 jfb 55: static const char *yyInput;
1.1 jfb 56: static DSTMODE yyDSTmode;
57: static time_t yyDayOrdinal;
58: static time_t yyDayNumber;
59: static int yyHaveDate;
60: static int yyHaveDay;
61: static int yyHaveRel;
62: static int yyHaveTime;
63: static int yyHaveZone;
64: static time_t yyTimezone;
65: static time_t yyDay;
66: static time_t yyHour;
67: static time_t yyMinutes;
68: static time_t yyMonth;
69: static time_t yySeconds;
70: static time_t yyYear;
71: static MERIDIAN yyMeridian;
72: static time_t yyRelMonth;
73: static time_t yyRelSeconds;
74:
1.2 jfb 75:
1.14 xsa 76: static int yyerror(const char *);
77: static int yylex(void);
78: static int yyparse(void);
79: static int lookup(char *);
1.2 jfb 80:
1.1 jfb 81: %}
82:
83: %union {
84: time_t Number;
85: enum _MERIDIAN Meridian;
86: }
87:
88: %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
89: %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
90:
91: %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
92: %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
93: %type <Meridian> tMERIDIAN o_merid
94:
95: %%
96:
97: spec : /* NULL */
98: | spec item
99: ;
100:
101: item : time {
1.3 jfb 102: yyHaveTime++;
1.1 jfb 103: }
104: | zone {
1.3 jfb 105: yyHaveZone++;
1.1 jfb 106: }
107: | date {
1.3 jfb 108: yyHaveDate++;
1.1 jfb 109: }
110: | day {
1.3 jfb 111: yyHaveDay++;
1.1 jfb 112: }
113: | rel {
1.3 jfb 114: yyHaveRel++;
1.1 jfb 115: }
116: | number
117: ;
118:
119: time : tUNUMBER tMERIDIAN {
1.3 jfb 120: yyHour = $1;
121: yyMinutes = 0;
122: yySeconds = 0;
123: yyMeridian = $2;
1.1 jfb 124: }
125: | tUNUMBER ':' tUNUMBER o_merid {
1.3 jfb 126: yyHour = $1;
127: yyMinutes = $3;
128: yySeconds = 0;
129: yyMeridian = $4;
1.1 jfb 130: }
131: | tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 jfb 132: yyHour = $1;
133: yyMinutes = $3;
134: yyMeridian = MER24;
135: yyDSTmode = DSToff;
136: yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
1.1 jfb 137: }
138: | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
1.3 jfb 139: yyHour = $1;
140: yyMinutes = $3;
141: yySeconds = $5;
142: yyMeridian = $6;
1.1 jfb 143: }
144: | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
1.3 jfb 145: yyHour = $1;
146: yyMinutes = $3;
147: yySeconds = $5;
148: yyMeridian = MER24;
149: yyDSTmode = DSToff;
150: yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
1.1 jfb 151: }
152: ;
153:
154: zone : tZONE {
1.3 jfb 155: yyTimezone = $1;
156: yyDSTmode = DSToff;
1.1 jfb 157: }
158: | tDAYZONE {
1.3 jfb 159: yyTimezone = $1;
160: yyDSTmode = DSTon;
1.1 jfb 161: }
1.3 jfb 162: | tZONE tDST {
163: yyTimezone = $1;
164: yyDSTmode = DSTon;
1.1 jfb 165: }
166: ;
167:
168: day : tDAY {
1.3 jfb 169: yyDayOrdinal = 1;
170: yyDayNumber = $1;
1.1 jfb 171: }
172: | tDAY ',' {
1.3 jfb 173: yyDayOrdinal = 1;
174: yyDayNumber = $1;
1.1 jfb 175: }
176: | tUNUMBER tDAY {
1.3 jfb 177: yyDayOrdinal = $1;
178: yyDayNumber = $2;
1.1 jfb 179: }
180: ;
181:
182: date : tUNUMBER '/' tUNUMBER {
1.3 jfb 183: yyMonth = $1;
184: yyDay = $3;
185: }
186: | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
187: if ($1 >= 100) {
188: yyYear = $1;
189: yyMonth = $3;
190: yyDay = $5;
191: } else {
1.1 jfb 192: yyMonth = $1;
193: yyDay = $3;
1.3 jfb 194: yyYear = $5;
195: }
1.1 jfb 196: }
1.3 jfb 197: | tUNUMBER tSNUMBER tSNUMBER {
198: /* ISO 8601 format. yyyy-mm-dd. */
1.1 jfb 199: yyYear = $1;
1.3 jfb 200: yyMonth = -$2;
201: yyDay = -$3;
1.1 jfb 202: }
203: | tUNUMBER tMONTH tSNUMBER {
1.3 jfb 204: /* e.g. 17-JUN-1992. */
205: yyDay = $1;
206: yyMonth = $2;
207: yyYear = -$3;
1.1 jfb 208: }
209: | tMONTH tUNUMBER {
1.3 jfb 210: yyMonth = $1;
211: yyDay = $2;
1.1 jfb 212: }
213: | tMONTH tUNUMBER ',' tUNUMBER {
1.3 jfb 214: yyMonth = $1;
215: yyDay = $2;
216: yyYear = $4;
1.1 jfb 217: }
218: | tUNUMBER tMONTH {
1.3 jfb 219: yyMonth = $2;
220: yyDay = $1;
1.1 jfb 221: }
222: | tUNUMBER tMONTH tUNUMBER {
1.3 jfb 223: yyMonth = $2;
224: yyDay = $1;
225: yyYear = $3;
1.1 jfb 226: }
227: ;
228:
229: rel : relunit tAGO {
1.3 jfb 230: yyRelSeconds = -yyRelSeconds;
231: yyRelMonth = -yyRelMonth;
1.1 jfb 232: }
233: | relunit
234: ;
235:
236: relunit : tUNUMBER tMINUTE_UNIT {
1.3 jfb 237: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 238: }
239: | tSNUMBER tMINUTE_UNIT {
1.3 jfb 240: yyRelSeconds += $1 * $2 * 60L;
1.1 jfb 241: }
242: | tMINUTE_UNIT {
1.3 jfb 243: yyRelSeconds += $1 * 60L;
1.1 jfb 244: }
245: | tSNUMBER tSEC_UNIT {
1.3 jfb 246: yyRelSeconds += $1;
1.1 jfb 247: }
248: | tUNUMBER tSEC_UNIT {
1.3 jfb 249: yyRelSeconds += $1;
1.1 jfb 250: }
251: | tSEC_UNIT {
1.3 jfb 252: yyRelSeconds++;
1.1 jfb 253: }
254: | tSNUMBER tMONTH_UNIT {
1.3 jfb 255: yyRelMonth += $1 * $2;
1.1 jfb 256: }
257: | tUNUMBER tMONTH_UNIT {
1.3 jfb 258: yyRelMonth += $1 * $2;
1.1 jfb 259: }
260: | tMONTH_UNIT {
1.3 jfb 261: yyRelMonth += $1;
1.1 jfb 262: }
263: ;
264:
265: number : tUNUMBER {
1.3 jfb 266: if (yyHaveTime && yyHaveDate && !yyHaveRel)
267: yyYear = $1;
268: else {
269: if ($1 > 10000) {
1.1 jfb 270: yyHaveDate++;
271: yyDay= ($1)%100;
272: yyMonth= ($1/100)%100;
273: yyYear = $1/10000;
1.3 jfb 274: } else {
1.1 jfb 275: yyHaveTime++;
276: if ($1 < 100) {
1.3 jfb 277: yyHour = $1;
278: yyMinutes = 0;
279: } else {
1.1 jfb 280: yyHour = $1 / 100;
281: yyMinutes = $1 % 100;
282: }
283: yySeconds = 0;
284: yyMeridian = MER24;
285: }
1.3 jfb 286: }
1.1 jfb 287: }
288: ;
289:
290: o_merid : /* NULL */ {
291: $$ = MER24;
292: }
293: | tMERIDIAN {
294: $$ = $1;
295: }
296: ;
297:
298: %%
299:
300: /* Month and day table. */
301: static TABLE const MonthDayTable[] = {
302: { "january", tMONTH, 1 },
303: { "february", tMONTH, 2 },
304: { "march", tMONTH, 3 },
305: { "april", tMONTH, 4 },
306: { "may", tMONTH, 5 },
307: { "june", tMONTH, 6 },
308: { "july", tMONTH, 7 },
309: { "august", tMONTH, 8 },
310: { "september", tMONTH, 9 },
311: { "sept", tMONTH, 9 },
312: { "october", tMONTH, 10 },
313: { "november", tMONTH, 11 },
314: { "december", tMONTH, 12 },
315: { "sunday", tDAY, 0 },
316: { "monday", tDAY, 1 },
317: { "tuesday", tDAY, 2 },
318: { "tues", tDAY, 2 },
319: { "wednesday", tDAY, 3 },
320: { "wednes", tDAY, 3 },
321: { "thursday", tDAY, 4 },
322: { "thur", tDAY, 4 },
323: { "thurs", tDAY, 4 },
324: { "friday", tDAY, 5 },
325: { "saturday", tDAY, 6 },
326: { NULL }
327: };
328:
329: /* Time units table. */
330: static TABLE const UnitsTable[] = {
331: { "year", tMONTH_UNIT, 12 },
332: { "month", tMONTH_UNIT, 1 },
333: { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
334: { "week", tMINUTE_UNIT, 7 * 24 * 60 },
335: { "day", tMINUTE_UNIT, 1 * 24 * 60 },
336: { "hour", tMINUTE_UNIT, 60 },
337: { "minute", tMINUTE_UNIT, 1 },
338: { "min", tMINUTE_UNIT, 1 },
339: { "second", tSEC_UNIT, 1 },
340: { "sec", tSEC_UNIT, 1 },
341: { NULL }
342: };
343:
344: /* Assorted relative-time words. */
345: static TABLE const OtherTable[] = {
346: { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
347: { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
348: { "today", tMINUTE_UNIT, 0 },
349: { "now", tMINUTE_UNIT, 0 },
350: { "last", tUNUMBER, -1 },
351: { "this", tMINUTE_UNIT, 0 },
352: { "next", tUNUMBER, 2 },
353: { "first", tUNUMBER, 1 },
354: /* { "second", tUNUMBER, 2 }, */
355: { "third", tUNUMBER, 3 },
356: { "fourth", tUNUMBER, 4 },
357: { "fifth", tUNUMBER, 5 },
358: { "sixth", tUNUMBER, 6 },
359: { "seventh", tUNUMBER, 7 },
360: { "eighth", tUNUMBER, 8 },
361: { "ninth", tUNUMBER, 9 },
362: { "tenth", tUNUMBER, 10 },
363: { "eleventh", tUNUMBER, 11 },
364: { "twelfth", tUNUMBER, 12 },
365: { "ago", tAGO, 1 },
366: { NULL }
367: };
368:
369: /* The timezone table. */
370: /* Some of these are commented out because a time_t can't store a float. */
371: static TABLE const TimezoneTable[] = {
372: { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
1.4 jfb 373: { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
1.1 jfb 374: { "utc", tZONE, HOUR( 0) },
375: { "wet", tZONE, HOUR( 0) }, /* Western European */
376: { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
377: { "wat", tZONE, HOUR( 1) }, /* West Africa */
1.4 jfb 378: { "at", tZONE, HOUR( 2) }, /* Azores */
1.1 jfb 379: #if 0
380: /* For completeness. BST is also British Summer, and GST is
381: * also Guam Standard. */
382: { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
383: { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
384: #endif
385: #if 0
386: { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
387: { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
388: { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
389: #endif
390: { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
391: { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
392: { "est", tZONE, HOUR( 5) }, /* Eastern Standard */
393: { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
394: { "cst", tZONE, HOUR( 6) }, /* Central Standard */
395: { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
396: { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
397: { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
398: { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
399: { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
400: { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
401: { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
402: { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
403: { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
404: { "cat", tZONE, HOUR(10) }, /* Central Alaska */
405: { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
1.4 jfb 406: { "nt", tZONE, HOUR(11) }, /* Nome */
1.1 jfb 407: { "idlw", tZONE, HOUR(12) }, /* International Date Line West */
408: { "cet", tZONE, -HOUR(1) }, /* Central European */
409: { "met", tZONE, -HOUR(1) }, /* Middle European */
410: { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
411: { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
412: { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
413: { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
414: { "fwt", tZONE, -HOUR(1) }, /* French Winter */
415: { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
416: { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
1.4 jfb 417: { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
1.1 jfb 418: #if 0
1.4 jfb 419: { "it", tZONE, -HOUR(3.5) },/* Iran */
1.1 jfb 420: #endif
421: { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
422: { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
423: #if 0
424: { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
425: #endif
426: { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
427: #if 0
428: /* For completeness. NST is also Newfoundland Stanard, and SST is
429: * also Swedish Summer. */
430: { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
431: { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
432: #endif /* 0 */
433: { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
434: { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
435: #if 0
1.4 jfb 436: { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
1.1 jfb 437: #endif
438: { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
439: { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
440: #if 0
441: { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
442: { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
443: #endif
444: { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
445: { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
446: { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
447: { "nzt", tZONE, -HOUR(12) }, /* New Zealand */
448: { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
449: { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
450: { "idle", tZONE, -HOUR(12) }, /* International Date Line East */
451: { NULL }
452: };
453:
454: /* Military timezone table. */
455: static TABLE const MilitaryTable[] = {
456: { "a", tZONE, HOUR( 1) },
457: { "b", tZONE, HOUR( 2) },
458: { "c", tZONE, HOUR( 3) },
459: { "d", tZONE, HOUR( 4) },
460: { "e", tZONE, HOUR( 5) },
461: { "f", tZONE, HOUR( 6) },
462: { "g", tZONE, HOUR( 7) },
463: { "h", tZONE, HOUR( 8) },
464: { "i", tZONE, HOUR( 9) },
465: { "k", tZONE, HOUR( 10) },
466: { "l", tZONE, HOUR( 11) },
467: { "m", tZONE, HOUR( 12) },
468: { "n", tZONE, HOUR(- 1) },
469: { "o", tZONE, HOUR(- 2) },
470: { "p", tZONE, HOUR(- 3) },
471: { "q", tZONE, HOUR(- 4) },
472: { "r", tZONE, HOUR(- 5) },
473: { "s", tZONE, HOUR(- 6) },
474: { "t", tZONE, HOUR(- 7) },
475: { "u", tZONE, HOUR(- 8) },
476: { "v", tZONE, HOUR(- 9) },
477: { "w", tZONE, HOUR(-10) },
478: { "x", tZONE, HOUR(-11) },
479: { "y", tZONE, HOUR(-12) },
480: { "z", tZONE, HOUR( 0) },
481: { NULL }
482: };
483:
484:
485: static int
1.9 otto 486: yyerror(const char *s)
1.1 jfb 487: {
1.18 cnst 488: #if !defined(TEST)
1.9 otto 489: char *str;
490:
1.18 cnst 491: (void)xasprintf(&str, "parsing date string: %s", s);
1.9 otto 492: cvs_log(LP_ERR, "%s", str);
1.13 ray 493: xfree(str);
1.18 cnst 494: #endif
1.1 jfb 495: return (0);
496: }
497:
498:
499: static time_t
500: ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
501: {
502: if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
503: return (-1);
504:
505: switch (Meridian) {
506: case MER24:
507: if (Hours < 0 || Hours > 23)
508: return (-1);
509: return (Hours * 60L + Minutes) * 60L + Seconds;
510: case MERam:
511: if (Hours < 1 || Hours > 12)
512: return (-1);
513: if (Hours == 12)
514: Hours = 0;
515: return (Hours * 60L + Minutes) * 60L + Seconds;
516: case MERpm:
517: if (Hours < 1 || Hours > 12)
518: return (-1);
519: if (Hours == 12)
520: Hours = 0;
521: return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
522: default:
1.17 chl 523: return (-1);
1.1 jfb 524: }
525: /* NOTREACHED */
526: }
527:
528:
529: /* Year is either
530: * A negative number, which means to use its absolute value (why?)
531: * A number from 0 to 99, which means a year from 1900 to 1999, or
532: * The actual year (>=100).
533: */
534: static time_t
535: Convert(time_t Month, time_t Day, time_t Year, time_t Hours, time_t Minutes,
536: time_t Seconds, MERIDIAN Meridian, DSTMODE DSTmode)
537: {
538: static int DaysInMonth[12] = {
539: 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
540: };
541: time_t tod;
542: time_t julian;
543: int i;
544:
545: if (Year < 0)
546: Year = -Year;
547: if (Year < 69)
548: Year += 2000;
549: else if (Year < 100) {
550: Year += 1900;
1.3 jfb 551: if (Year < YEAR_EPOCH)
1.1 jfb 552: Year += 100;
553: }
554: DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
555: ? 29 : 28;
556: /* Checking for 2038 bogusly assumes that time_t is 32 bits. But
557: I'm too lazy to try to check for time_t overflow in another way. */
1.3 jfb 558: if (Year < YEAR_EPOCH || Year > 2038 || 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: /*
803: * cvs_date_parse()
804: *
805: * Returns the number of seconds since the Epoch corresponding to the date.
806: */
1.1 jfb 807: time_t
1.7 jfb 808: cvs_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))
! 817: fatal("cvs_date_parse failed");
! 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:
865: /* Have to do *something* with a legitimate -1 so it's distinguishable
866: * from the error return value. (Alternately could set errno on error.)
867: */
868: return (Start == -1) ? (0) : (Start);
869: }
870:
871: #if defined(TEST)
872: /* ARGSUSED */
873: int
874: main(int argc, char **argv)
875: {
876: char buff[128];
877: time_t d;
878:
879: (void)printf("Enter date, or blank line to exit.\n\t> ");
880: (void)fflush(stdout);
881: while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
1.8 jfb 882: d = cvs_date_parse(buff);
1.1 jfb 883: if (d == -1)
884: (void)printf("Bad format - couldn't convert.\n");
885: else
886: (void)printf("%s", ctime(&d));
887: (void)printf("\t> ");
888: (void)fflush(stdout);
889: }
890:
891: return (0);
892: }
893: #endif /* defined(TEST) */