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e1a085ba A |
1 | %{ |
2 | /* | |
3 | ** Originally written by Steven M. Bellovin <smb@research.att.com> while | |
4 | ** at the University of North Carolina at Chapel Hill. Later tweaked by | |
5 | ** a couple of people on Usenet. Completely overhauled by Rich $alz | |
6 | ** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990; | |
7 | ** | |
8 | ** This grammar has 10 shift/reduce conflicts. | |
9 | ** | |
10 | ** This code is in the public domain and has no copyright. | |
11 | */ | |
12 | /* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */ | |
13 | /* SUPPRESS 288 on yyerrlab *//* Label unused */ | |
14 | ||
15 | #include <sys/cdefs.h> | |
1e9ba8f2 | 16 | __FBSDID("$FreeBSD: src/usr.bin/find/getdate.y,v 1.7 2010/02/09 21:24:41 ed Exp $"); |
e1a085ba A |
17 | |
18 | #include <stdio.h> | |
19 | #include <ctype.h> | |
20 | ||
21 | /* The code at the top of get_date which figures out the offset of the | |
22 | current time zone checks various CPP symbols to see if special | |
23 | tricks are need, but defaults to using the gettimeofday system call. | |
24 | Include <sys/time.h> if that will be used. */ | |
25 | ||
26 | #if defined(vms) | |
27 | # include <types.h> | |
28 | #else /* defined(vms) */ | |
29 | # include <sys/types.h> | |
30 | # include <sys/time.h> | |
e1a085ba A |
31 | #endif /* !defined(vms) */ |
32 | ||
33 | #if defined (__STDC__) || defined (USG) | |
34 | #include <string.h> | |
35 | #endif | |
36 | ||
37 | /* Some old versions of bison generate parsers that use bcopy. | |
38 | That loses on systems that don't provide the function, so we have | |
39 | to redefine it here. */ | |
40 | #if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy) | |
41 | #define bcopy(from, to, len) memcpy ((to), (from), (len)) | |
42 | #endif | |
43 | ||
44 | #if defined (__STDC__) | |
45 | #include <stdlib.h> | |
46 | #endif | |
47 | ||
48 | /* NOTES on rebuilding getdate.c (particularly for inclusion in CVS | |
49 | releases): | |
50 | ||
51 | We don't want to mess with all the portability hassles of alloca. | |
52 | In particular, most (all?) versions of bison will use alloca in | |
53 | their parser. If bison works on your system (e.g. it should work | |
54 | with gcc), then go ahead and use it, but the more general solution | |
55 | is to use byacc instead of bison, which should generate a portable | |
56 | parser. I played with adding "#define alloca dont_use_alloca", to | |
57 | give an error if the parser generator uses alloca (and thus detect | |
58 | unportable getdate.c's), but that seems to cause as many problems | |
59 | as it solves. */ | |
60 | ||
61 | #include <time.h> | |
62 | ||
63 | #define yyparse getdate_yyparse | |
64 | #define yylex getdate_yylex | |
65 | #define yyerror getdate_yyerror | |
66 | ||
67 | static int yyparse(void); | |
68 | static int yylex(void); | |
69 | static int yyerror(const char *); | |
70 | ||
1e9ba8f2 | 71 | time_t get_date(char *); |
e1a085ba A |
72 | |
73 | #define EPOCH 1970 | |
74 | #define HOUR(x) ((time_t)(x) * 60) | |
75 | #define SECSPERDAY (24L * 60L * 60L) | |
76 | ||
77 | ||
78 | /* | |
79 | ** An entry in the lexical lookup table. | |
80 | */ | |
81 | typedef struct _TABLE { | |
82 | const char *name; | |
83 | int type; | |
84 | time_t value; | |
85 | } TABLE; | |
86 | ||
87 | ||
88 | /* | |
89 | ** Daylight-savings mode: on, off, or not yet known. | |
90 | */ | |
91 | typedef enum _DSTMODE { | |
92 | DSTon, DSToff, DSTmaybe | |
93 | } DSTMODE; | |
94 | ||
95 | /* | |
96 | ** Meridian: am, pm, or 24-hour style. | |
97 | */ | |
98 | typedef enum _MERIDIAN { | |
99 | MERam, MERpm, MER24 | |
100 | } MERIDIAN; | |
101 | ||
102 | ||
103 | /* | |
104 | ** Global variables. We could get rid of most of these by using a good | |
105 | ** union as the yacc stack. (This routine was originally written before | |
106 | ** yacc had the %union construct.) Maybe someday; right now we only use | |
107 | ** the %union very rarely. | |
108 | */ | |
109 | static char *yyInput; | |
110 | static DSTMODE yyDSTmode; | |
111 | static time_t yyDayOrdinal; | |
112 | static time_t yyDayNumber; | |
113 | static int yyHaveDate; | |
114 | static int yyHaveDay; | |
115 | static int yyHaveRel; | |
116 | static int yyHaveTime; | |
117 | static int yyHaveZone; | |
118 | static time_t yyTimezone; | |
119 | static time_t yyDay; | |
120 | static time_t yyHour; | |
121 | static time_t yyMinutes; | |
122 | static time_t yyMonth; | |
123 | static time_t yySeconds; | |
124 | static time_t yyYear; | |
125 | static MERIDIAN yyMeridian; | |
126 | static time_t yyRelMonth; | |
127 | static time_t yyRelSeconds; | |
128 | ||
129 | %} | |
130 | ||
131 | %union { | |
132 | time_t Number; | |
133 | enum _MERIDIAN Meridian; | |
134 | } | |
135 | ||
136 | %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT | |
137 | %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST | |
138 | ||
139 | %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT | |
140 | %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE | |
141 | %type <Meridian> tMERIDIAN o_merid | |
142 | ||
143 | %% | |
144 | ||
145 | spec : /* NULL */ | |
146 | | spec item | |
147 | ; | |
148 | ||
149 | item : time { | |
150 | yyHaveTime++; | |
151 | } | |
152 | | zone { | |
153 | yyHaveZone++; | |
154 | } | |
155 | | date { | |
156 | yyHaveDate++; | |
157 | } | |
158 | | day { | |
159 | yyHaveDay++; | |
160 | } | |
161 | | rel { | |
162 | yyHaveRel++; | |
163 | } | |
164 | | number | |
165 | ; | |
166 | ||
167 | time : tUNUMBER tMERIDIAN { | |
168 | yyHour = $1; | |
169 | yyMinutes = 0; | |
170 | yySeconds = 0; | |
171 | yyMeridian = $2; | |
172 | } | |
173 | | tUNUMBER ':' tUNUMBER o_merid { | |
174 | yyHour = $1; | |
175 | yyMinutes = $3; | |
176 | yySeconds = 0; | |
177 | yyMeridian = $4; | |
178 | } | |
179 | | tUNUMBER ':' tUNUMBER tSNUMBER { | |
180 | yyHour = $1; | |
181 | yyMinutes = $3; | |
182 | yyMeridian = MER24; | |
183 | yyDSTmode = DSToff; | |
184 | yyTimezone = - ($4 % 100 + ($4 / 100) * 60); | |
185 | } | |
186 | | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { | |
187 | yyHour = $1; | |
188 | yyMinutes = $3; | |
189 | yySeconds = $5; | |
190 | yyMeridian = $6; | |
191 | } | |
192 | | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { | |
193 | yyHour = $1; | |
194 | yyMinutes = $3; | |
195 | yySeconds = $5; | |
196 | yyMeridian = MER24; | |
197 | yyDSTmode = DSToff; | |
198 | yyTimezone = - ($6 % 100 + ($6 / 100) * 60); | |
199 | } | |
200 | ; | |
201 | ||
202 | zone : tZONE { | |
203 | yyTimezone = $1; | |
204 | yyDSTmode = DSToff; | |
205 | } | |
206 | | tDAYZONE { | |
207 | yyTimezone = $1; | |
208 | yyDSTmode = DSTon; | |
209 | } | |
210 | | | |
211 | tZONE tDST { | |
212 | yyTimezone = $1; | |
213 | yyDSTmode = DSTon; | |
214 | } | |
215 | ; | |
216 | ||
217 | day : tDAY { | |
218 | yyDayOrdinal = 1; | |
219 | yyDayNumber = $1; | |
220 | } | |
221 | | tDAY ',' { | |
222 | yyDayOrdinal = 1; | |
223 | yyDayNumber = $1; | |
224 | } | |
225 | | tUNUMBER tDAY { | |
226 | yyDayOrdinal = $1; | |
227 | yyDayNumber = $2; | |
228 | } | |
229 | ; | |
230 | ||
231 | date : tUNUMBER '/' tUNUMBER { | |
232 | yyMonth = $1; | |
233 | yyDay = $3; | |
234 | } | |
235 | | tUNUMBER '/' tUNUMBER '/' tUNUMBER { | |
236 | if ($1 >= 100) { | |
237 | yyYear = $1; | |
238 | yyMonth = $3; | |
239 | yyDay = $5; | |
240 | } else { | |
241 | yyMonth = $1; | |
242 | yyDay = $3; | |
243 | yyYear = $5; | |
244 | } | |
245 | } | |
246 | | tUNUMBER tSNUMBER tSNUMBER { | |
247 | /* ISO 8601 format. yyyy-mm-dd. */ | |
248 | yyYear = $1; | |
249 | yyMonth = -$2; | |
250 | yyDay = -$3; | |
251 | } | |
252 | | tUNUMBER tMONTH tSNUMBER { | |
253 | /* e.g. 17-JUN-1992. */ | |
254 | yyDay = $1; | |
255 | yyMonth = $2; | |
256 | yyYear = -$3; | |
257 | } | |
258 | | tMONTH tUNUMBER { | |
259 | yyMonth = $1; | |
260 | yyDay = $2; | |
261 | } | |
262 | | tMONTH tUNUMBER ',' tUNUMBER { | |
263 | yyMonth = $1; | |
264 | yyDay = $2; | |
265 | yyYear = $4; | |
266 | } | |
267 | | tUNUMBER tMONTH { | |
268 | yyMonth = $2; | |
269 | yyDay = $1; | |
270 | } | |
271 | | tUNUMBER tMONTH tUNUMBER { | |
272 | yyMonth = $2; | |
273 | yyDay = $1; | |
274 | yyYear = $3; | |
275 | } | |
276 | ; | |
277 | ||
278 | rel : relunit tAGO { | |
279 | yyRelSeconds = -yyRelSeconds; | |
280 | yyRelMonth = -yyRelMonth; | |
281 | } | |
282 | | relunit | |
283 | ; | |
284 | ||
285 | relunit : tUNUMBER tMINUTE_UNIT { | |
286 | yyRelSeconds += $1 * $2 * 60L; | |
287 | } | |
288 | | tSNUMBER tMINUTE_UNIT { | |
289 | yyRelSeconds += $1 * $2 * 60L; | |
290 | } | |
291 | | tMINUTE_UNIT { | |
292 | yyRelSeconds += $1 * 60L; | |
293 | } | |
294 | | tSNUMBER tSEC_UNIT { | |
295 | yyRelSeconds += $1; | |
296 | } | |
297 | | tUNUMBER tSEC_UNIT { | |
298 | yyRelSeconds += $1; | |
299 | } | |
300 | | tSEC_UNIT { | |
301 | yyRelSeconds++; | |
302 | } | |
303 | | tSNUMBER tMONTH_UNIT { | |
304 | yyRelMonth += $1 * $2; | |
305 | } | |
306 | | tUNUMBER tMONTH_UNIT { | |
307 | yyRelMonth += $1 * $2; | |
308 | } | |
309 | | tMONTH_UNIT { | |
310 | yyRelMonth += $1; | |
311 | } | |
312 | ; | |
313 | ||
314 | number : tUNUMBER { | |
315 | if (yyHaveTime && yyHaveDate && !yyHaveRel) | |
316 | yyYear = $1; | |
317 | else { | |
318 | if($1>10000) { | |
319 | yyHaveDate++; | |
320 | yyDay= ($1)%100; | |
321 | yyMonth= ($1/100)%100; | |
322 | yyYear = $1/10000; | |
323 | } | |
324 | else { | |
325 | yyHaveTime++; | |
326 | if ($1 < 100) { | |
327 | yyHour = $1; | |
328 | yyMinutes = 0; | |
329 | } | |
330 | else { | |
331 | yyHour = $1 / 100; | |
332 | yyMinutes = $1 % 100; | |
333 | } | |
334 | yySeconds = 0; | |
335 | yyMeridian = MER24; | |
336 | } | |
337 | } | |
338 | } | |
339 | ; | |
340 | ||
341 | o_merid : /* NULL */ { | |
342 | $$ = MER24; | |
343 | } | |
344 | | tMERIDIAN { | |
345 | $$ = $1; | |
346 | } | |
347 | ; | |
348 | ||
349 | %% | |
350 | ||
351 | /* Month and day table. */ | |
352 | static TABLE const MonthDayTable[] = { | |
353 | { "january", tMONTH, 1 }, | |
354 | { "february", tMONTH, 2 }, | |
355 | { "march", tMONTH, 3 }, | |
356 | { "april", tMONTH, 4 }, | |
357 | { "may", tMONTH, 5 }, | |
358 | { "june", tMONTH, 6 }, | |
359 | { "july", tMONTH, 7 }, | |
360 | { "august", tMONTH, 8 }, | |
361 | { "september", tMONTH, 9 }, | |
362 | { "sept", tMONTH, 9 }, | |
363 | { "october", tMONTH, 10 }, | |
364 | { "november", tMONTH, 11 }, | |
365 | { "december", tMONTH, 12 }, | |
366 | { "sunday", tDAY, 0 }, | |
367 | { "monday", tDAY, 1 }, | |
368 | { "tuesday", tDAY, 2 }, | |
369 | { "tues", tDAY, 2 }, | |
370 | { "wednesday", tDAY, 3 }, | |
371 | { "wednes", tDAY, 3 }, | |
372 | { "thursday", tDAY, 4 }, | |
373 | { "thur", tDAY, 4 }, | |
374 | { "thurs", tDAY, 4 }, | |
375 | { "friday", tDAY, 5 }, | |
376 | { "saturday", tDAY, 6 }, | |
377 | { NULL, 0, 0 } | |
378 | }; | |
379 | ||
380 | /* Time units table. */ | |
381 | static TABLE const UnitsTable[] = { | |
382 | { "year", tMONTH_UNIT, 12 }, | |
383 | { "month", tMONTH_UNIT, 1 }, | |
384 | { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, | |
385 | { "week", tMINUTE_UNIT, 7 * 24 * 60 }, | |
386 | { "day", tMINUTE_UNIT, 1 * 24 * 60 }, | |
387 | { "hour", tMINUTE_UNIT, 60 }, | |
388 | { "minute", tMINUTE_UNIT, 1 }, | |
389 | { "min", tMINUTE_UNIT, 1 }, | |
390 | { "second", tSEC_UNIT, 1 }, | |
391 | { "sec", tSEC_UNIT, 1 }, | |
392 | { NULL, 0, 0 } | |
393 | }; | |
394 | ||
395 | /* Assorted relative-time words. */ | |
396 | static TABLE const OtherTable[] = { | |
397 | { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, | |
398 | { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, | |
399 | { "today", tMINUTE_UNIT, 0 }, | |
400 | { "now", tMINUTE_UNIT, 0 }, | |
401 | { "last", tUNUMBER, -1 }, | |
402 | { "this", tMINUTE_UNIT, 0 }, | |
403 | { "next", tUNUMBER, 2 }, | |
404 | { "first", tUNUMBER, 1 }, | |
405 | /* { "second", tUNUMBER, 2 }, */ | |
406 | { "third", tUNUMBER, 3 }, | |
407 | { "fourth", tUNUMBER, 4 }, | |
408 | { "fifth", tUNUMBER, 5 }, | |
409 | { "sixth", tUNUMBER, 6 }, | |
410 | { "seventh", tUNUMBER, 7 }, | |
411 | { "eighth", tUNUMBER, 8 }, | |
412 | { "ninth", tUNUMBER, 9 }, | |
413 | { "tenth", tUNUMBER, 10 }, | |
414 | { "eleventh", tUNUMBER, 11 }, | |
415 | { "twelfth", tUNUMBER, 12 }, | |
416 | { "ago", tAGO, 1 }, | |
417 | { NULL, 0, 0 } | |
418 | }; | |
419 | ||
420 | /* The timezone table. */ | |
421 | /* Some of these are commented out because a time_t can't store a float. */ | |
422 | static TABLE const TimezoneTable[] = { | |
423 | { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ | |
424 | { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */ | |
425 | { "utc", tZONE, HOUR( 0) }, | |
426 | { "wet", tZONE, HOUR( 0) }, /* Western European */ | |
427 | { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ | |
428 | { "wat", tZONE, HOUR( 1) }, /* West Africa */ | |
429 | { "at", tZONE, HOUR( 2) }, /* Azores */ | |
430 | #if 0 | |
431 | /* For completeness. BST is also British Summer, and GST is | |
432 | * also Guam Standard. */ | |
433 | { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ | |
434 | { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ | |
435 | #endif | |
436 | #if 0 | |
437 | { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */ | |
438 | { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */ | |
439 | { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */ | |
440 | #endif | |
441 | { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ | |
442 | { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ | |
443 | { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ | |
444 | { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ | |
445 | { "cst", tZONE, HOUR( 6) }, /* Central Standard */ | |
446 | { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ | |
447 | { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ | |
448 | { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ | |
449 | { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ | |
450 | { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ | |
451 | { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ | |
452 | { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ | |
453 | { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ | |
454 | { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */ | |
455 | { "cat", tZONE, HOUR(10) }, /* Central Alaska */ | |
456 | { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */ | |
457 | { "nt", tZONE, HOUR(11) }, /* Nome */ | |
458 | { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ | |
459 | { "cet", tZONE, -HOUR(1) }, /* Central European */ | |
460 | { "met", tZONE, -HOUR(1) }, /* Middle European */ | |
461 | { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ | |
462 | { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ | |
463 | { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */ | |
464 | { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */ | |
465 | { "fwt", tZONE, -HOUR(1) }, /* French Winter */ | |
466 | { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */ | |
467 | { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */ | |
468 | { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */ | |
469 | #if 0 | |
470 | { "it", tZONE, -HOUR(3.5) },/* Iran */ | |
471 | #endif | |
472 | { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */ | |
473 | { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */ | |
474 | #if 0 | |
475 | { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */ | |
476 | #endif | |
477 | { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */ | |
478 | #if 0 | |
479 | /* For completeness. NST is also Newfoundland Stanard, and SST is | |
480 | * also Swedish Summer. */ | |
481 | { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */ | |
482 | { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */ | |
483 | #endif /* 0 */ | |
484 | { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */ | |
485 | { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */ | |
486 | #if 0 | |
487 | { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */ | |
488 | #endif | |
489 | { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */ | |
490 | { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */ | |
491 | #if 0 | |
492 | { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */ | |
493 | { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */ | |
494 | #endif | |
495 | { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ | |
496 | { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ | |
497 | { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */ | |
498 | { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ | |
499 | { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ | |
500 | { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ | |
501 | { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ | |
502 | { NULL, 0, 0 } | |
503 | }; | |
504 | ||
505 | /* Military timezone table. */ | |
506 | static TABLE const MilitaryTable[] = { | |
507 | { "a", tZONE, HOUR( 1) }, | |
508 | { "b", tZONE, HOUR( 2) }, | |
509 | { "c", tZONE, HOUR( 3) }, | |
510 | { "d", tZONE, HOUR( 4) }, | |
511 | { "e", tZONE, HOUR( 5) }, | |
512 | { "f", tZONE, HOUR( 6) }, | |
513 | { "g", tZONE, HOUR( 7) }, | |
514 | { "h", tZONE, HOUR( 8) }, | |
515 | { "i", tZONE, HOUR( 9) }, | |
516 | { "k", tZONE, HOUR( 10) }, | |
517 | { "l", tZONE, HOUR( 11) }, | |
518 | { "m", tZONE, HOUR( 12) }, | |
519 | { "n", tZONE, HOUR(- 1) }, | |
520 | { "o", tZONE, HOUR(- 2) }, | |
521 | { "p", tZONE, HOUR(- 3) }, | |
522 | { "q", tZONE, HOUR(- 4) }, | |
523 | { "r", tZONE, HOUR(- 5) }, | |
524 | { "s", tZONE, HOUR(- 6) }, | |
525 | { "t", tZONE, HOUR(- 7) }, | |
526 | { "u", tZONE, HOUR(- 8) }, | |
527 | { "v", tZONE, HOUR(- 9) }, | |
528 | { "w", tZONE, HOUR(-10) }, | |
529 | { "x", tZONE, HOUR(-11) }, | |
530 | { "y", tZONE, HOUR(-12) }, | |
531 | { "z", tZONE, HOUR( 0) }, | |
532 | { NULL, 0, 0 } | |
533 | }; | |
534 | ||
535 | \f | |
536 | ||
537 | ||
538 | /* ARGSUSED */ | |
539 | static int | |
540 | yyerror(const char *s __unused) | |
541 | { | |
542 | return 0; | |
543 | } | |
544 | ||
545 | ||
546 | static time_t | |
547 | ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian) | |
548 | { | |
549 | if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) | |
550 | return -1; | |
551 | switch (Meridian) { | |
552 | case MER24: | |
553 | if (Hours < 0 || Hours > 23) | |
554 | return -1; | |
555 | return (Hours * 60L + Minutes) * 60L + Seconds; | |
556 | case MERam: | |
557 | if (Hours < 1 || Hours > 12) | |
558 | return -1; | |
559 | if (Hours == 12) | |
560 | Hours = 0; | |
561 | return (Hours * 60L + Minutes) * 60L + Seconds; | |
562 | case MERpm: | |
563 | if (Hours < 1 || Hours > 12) | |
564 | return -1; | |
565 | if (Hours == 12) | |
566 | Hours = 0; | |
567 | return ((Hours + 12) * 60L + Minutes) * 60L + Seconds; | |
568 | default: | |
569 | abort (); | |
570 | } | |
571 | /* NOTREACHED */ | |
572 | } | |
573 | ||
574 | ||
575 | /* Year is either | |
576 | * A negative number, which means to use its absolute value (why?) | |
577 | * A number from 0 to 99, which means a year from 1900 to 1999, or | |
578 | * The actual year (>=100). */ | |
579 | static time_t | |
580 | Convert(time_t Month, time_t Day, time_t Year, | |
581 | time_t Hours, time_t Minutes, time_t Seconds, | |
582 | MERIDIAN Meridian, DSTMODE DSTmode) | |
583 | { | |
584 | static int DaysInMonth[12] = { | |
585 | 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 | |
586 | }; | |
587 | time_t tod; | |
588 | time_t Julian; | |
589 | int i; | |
590 | ||
591 | if (Year < 0) | |
592 | Year = -Year; | |
593 | if (Year < 69) | |
594 | Year += 2000; | |
595 | else if (Year < 100) | |
596 | Year += 1900; | |
597 | DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) | |
598 | ? 29 : 28; | |
599 | /* Checking for 2038 bogusly assumes that time_t is 32 bits. But | |
600 | I'm too lazy to try to check for time_t overflow in another way. */ | |
601 | if (Year < EPOCH || Year > 2038 | |
602 | || Month < 1 || Month > 12 | |
603 | /* Lint fluff: "conversion from long may lose accuracy" */ | |
604 | || Day < 1 || Day > DaysInMonth[(int)--Month]) | |
605 | return -1; | |
606 | ||
607 | for (Julian = Day - 1, i = 0; i < Month; i++) | |
608 | Julian += DaysInMonth[i]; | |
609 | for (i = EPOCH; i < Year; i++) | |
610 | Julian += 365 + (i % 4 == 0); | |
611 | Julian *= SECSPERDAY; | |
612 | Julian += yyTimezone * 60L; | |
613 | if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0) | |
614 | return -1; | |
615 | Julian += tod; | |
616 | if (DSTmode == DSTon | |
617 | || (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst)) | |
618 | Julian -= 60 * 60; | |
619 | return Julian; | |
620 | } | |
621 | ||
622 | ||
623 | static time_t | |
624 | DSTcorrect(time_t Start, time_t Future) | |
625 | { | |
626 | time_t StartDay; | |
627 | time_t FutureDay; | |
628 | ||
629 | StartDay = (localtime(&Start)->tm_hour + 1) % 24; | |
630 | FutureDay = (localtime(&Future)->tm_hour + 1) % 24; | |
631 | return (Future - Start) + (StartDay - FutureDay) * 60L * 60L; | |
632 | } | |
633 | ||
634 | ||
635 | static time_t | |
636 | RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber) | |
637 | { | |
638 | struct tm *tm; | |
639 | time_t now; | |
640 | ||
641 | now = Start; | |
642 | tm = localtime(&now); | |
643 | now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7); | |
644 | now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1); | |
645 | return DSTcorrect(Start, now); | |
646 | } | |
647 | ||
648 | ||
649 | static time_t | |
650 | RelativeMonth(time_t Start, time_t RelMonth) | |
651 | { | |
652 | struct tm *tm; | |
653 | time_t Month; | |
654 | time_t Year; | |
655 | ||
656 | if (RelMonth == 0) | |
657 | return 0; | |
658 | tm = localtime(&Start); | |
659 | Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth; | |
660 | Year = Month / 12; | |
661 | Month = Month % 12 + 1; | |
662 | return DSTcorrect(Start, | |
663 | Convert(Month, (time_t)tm->tm_mday, Year, | |
664 | (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec, | |
665 | MER24, DSTmaybe)); | |
666 | } | |
667 | ||
668 | ||
669 | static int | |
670 | LookupWord(char *buff) | |
671 | { | |
672 | char *p; | |
673 | char *q; | |
674 | const TABLE *tp; | |
675 | int i; | |
676 | int abbrev; | |
677 | ||
678 | /* Make it lowercase. */ | |
679 | for (p = buff; *p; p++) | |
680 | if (isupper(*p)) | |
681 | *p = tolower(*p); | |
682 | ||
683 | if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) { | |
684 | yylval.Meridian = MERam; | |
685 | return tMERIDIAN; | |
686 | } | |
687 | if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) { | |
688 | yylval.Meridian = MERpm; | |
689 | return tMERIDIAN; | |
690 | } | |
691 | ||
692 | /* See if we have an abbreviation for a month. */ | |
693 | if (strlen(buff) == 3) | |
694 | abbrev = 1; | |
695 | else if (strlen(buff) == 4 && buff[3] == '.') { | |
696 | abbrev = 1; | |
697 | buff[3] = '\0'; | |
698 | } | |
699 | else | |
700 | abbrev = 0; | |
701 | ||
702 | for (tp = MonthDayTable; tp->name; tp++) { | |
703 | if (abbrev) { | |
704 | if (strncmp(buff, tp->name, 3) == 0) { | |
705 | yylval.Number = tp->value; | |
706 | return tp->type; | |
707 | } | |
708 | } | |
709 | else if (strcmp(buff, tp->name) == 0) { | |
710 | yylval.Number = tp->value; | |
711 | return tp->type; | |
712 | } | |
713 | } | |
714 | ||
715 | for (tp = TimezoneTable; tp->name; tp++) | |
716 | if (strcmp(buff, tp->name) == 0) { | |
717 | yylval.Number = tp->value; | |
718 | return tp->type; | |
719 | } | |
720 | ||
721 | if (strcmp(buff, "dst") == 0) | |
722 | return tDST; | |
723 | ||
724 | for (tp = UnitsTable; tp->name; tp++) | |
725 | if (strcmp(buff, tp->name) == 0) { | |
726 | yylval.Number = tp->value; | |
727 | return tp->type; | |
728 | } | |
729 | ||
730 | /* Strip off any plural and try the units table again. */ | |
731 | i = strlen(buff) - 1; | |
732 | if (buff[i] == 's') { | |
733 | buff[i] = '\0'; | |
734 | for (tp = UnitsTable; tp->name; tp++) | |
735 | if (strcmp(buff, tp->name) == 0) { | |
736 | yylval.Number = tp->value; | |
737 | return tp->type; | |
738 | } | |
739 | buff[i] = 's'; /* Put back for "this" in OtherTable. */ | |
740 | } | |
741 | ||
742 | for (tp = OtherTable; tp->name; tp++) | |
743 | if (strcmp(buff, tp->name) == 0) { | |
744 | yylval.Number = tp->value; | |
745 | return tp->type; | |
746 | } | |
747 | ||
748 | /* Military timezones. */ | |
749 | if (buff[1] == '\0' && isalpha(*buff)) { | |
750 | for (tp = MilitaryTable; tp->name; tp++) | |
751 | if (strcmp(buff, tp->name) == 0) { | |
752 | yylval.Number = tp->value; | |
753 | return tp->type; | |
754 | } | |
755 | } | |
756 | ||
757 | /* Drop out any periods and try the timezone table again. */ | |
758 | for (i = 0, p = q = buff; *q; q++) | |
759 | if (*q != '.') | |
760 | *p++ = *q; | |
761 | else | |
762 | i++; | |
763 | *p = '\0'; | |
764 | if (i) | |
765 | for (tp = TimezoneTable; tp->name; tp++) | |
766 | if (strcmp(buff, tp->name) == 0) { | |
767 | yylval.Number = tp->value; | |
768 | return tp->type; | |
769 | } | |
770 | ||
771 | return tID; | |
772 | } | |
773 | ||
774 | ||
775 | static int | |
776 | yylex(void) | |
777 | { | |
778 | char c; | |
779 | char *p; | |
780 | char buff[20]; | |
781 | int Count; | |
782 | int sign; | |
783 | ||
784 | for ( ; ; ) { | |
785 | while (isspace(*yyInput)) | |
786 | yyInput++; | |
787 | ||
788 | if (isdigit(c = *yyInput) || c == '-' || c == '+') { | |
789 | if (c == '-' || c == '+') { | |
790 | sign = c == '-' ? -1 : 1; | |
791 | if (!isdigit(*++yyInput)) | |
792 | /* skip the '-' sign */ | |
793 | continue; | |
794 | } | |
795 | else | |
796 | sign = 0; | |
797 | for (yylval.Number = 0; isdigit(c = *yyInput++); ) | |
798 | yylval.Number = 10 * yylval.Number + c - '0'; | |
799 | yyInput--; | |
800 | if (sign < 0) | |
801 | yylval.Number = -yylval.Number; | |
802 | return sign ? tSNUMBER : tUNUMBER; | |
803 | } | |
804 | if (isalpha(c)) { | |
805 | for (p = buff; isalpha(c = *yyInput++) || c == '.'; ) | |
806 | if (p < &buff[sizeof buff - 1]) | |
807 | *p++ = c; | |
808 | *p = '\0'; | |
809 | yyInput--; | |
810 | return LookupWord(buff); | |
811 | } | |
812 | if (c != '(') | |
813 | return *yyInput++; | |
814 | Count = 0; | |
815 | do { | |
816 | c = *yyInput++; | |
817 | if (c == '\0') | |
818 | return c; | |
819 | if (c == '(') | |
820 | Count++; | |
821 | else if (c == ')') | |
822 | Count--; | |
823 | } while (Count > 0); | |
824 | } | |
825 | } | |
826 | ||
827 | #define TM_YEAR_ORIGIN 1900 | |
828 | ||
829 | /* Yield A - B, measured in seconds. */ | |
830 | static long | |
831 | difftm (struct tm *a, struct tm *b) | |
832 | { | |
833 | int ay = a->tm_year + (TM_YEAR_ORIGIN - 1); | |
834 | int by = b->tm_year + (TM_YEAR_ORIGIN - 1); | |
835 | int days = ( | |
836 | /* difference in day of year */ | |
837 | a->tm_yday - b->tm_yday | |
838 | /* + intervening leap days */ | |
839 | + ((ay >> 2) - (by >> 2)) | |
840 | - (ay/100 - by/100) | |
841 | + ((ay/100 >> 2) - (by/100 >> 2)) | |
842 | /* + difference in years * 365 */ | |
843 | + (long)(ay-by) * 365 | |
844 | ); | |
845 | return (60*(60*(24*days + (a->tm_hour - b->tm_hour)) | |
846 | + (a->tm_min - b->tm_min)) | |
847 | + (a->tm_sec - b->tm_sec)); | |
848 | } | |
849 | ||
850 | time_t | |
1e9ba8f2 | 851 | get_date(char *p) |
e1a085ba | 852 | { |
1e9ba8f2 A |
853 | struct tm *tm, *gmt_ptr, gmt; |
854 | int tzoff; | |
e1a085ba A |
855 | time_t Start; |
856 | time_t tod; | |
857 | time_t nowtime; | |
858 | ||
859 | bzero (&gmt, sizeof(struct tm)); | |
860 | yyInput = p; | |
e1a085ba | 861 | |
1e9ba8f2 | 862 | (void)time (&nowtime); |
e1a085ba | 863 | |
1e9ba8f2 A |
864 | gmt_ptr = gmtime (&nowtime); |
865 | if (gmt_ptr != NULL) | |
866 | { | |
867 | /* Make a copy, in case localtime modifies *tm (I think | |
868 | that comment now applies to *gmt_ptr, but I am too | |
869 | lazy to dig into how gmtime and locatime allocate the | |
870 | structures they return pointers to). */ | |
871 | gmt = *gmt_ptr; | |
872 | } | |
e1a085ba | 873 | |
1e9ba8f2 A |
874 | if (! (tm = localtime (&nowtime))) |
875 | return -1; | |
e1a085ba | 876 | |
1e9ba8f2 A |
877 | if (gmt_ptr != NULL) |
878 | tzoff = difftm (&gmt, tm) / 60; | |
e1a085ba | 879 | else |
1e9ba8f2 A |
880 | /* We are on a system like VMS, where the system clock is |
881 | in local time and the system has no concept of timezones. | |
882 | Hopefully we can fake this out (for the case in which the | |
883 | user specifies no timezone) by just saying the timezone | |
884 | is zero. */ | |
885 | tzoff = 0; | |
886 | ||
887 | if(tm->tm_isdst) | |
888 | tzoff += 60; | |
e1a085ba A |
889 | |
890 | tm = localtime(&nowtime); | |
891 | yyYear = tm->tm_year + 1900; | |
892 | yyMonth = tm->tm_mon + 1; | |
893 | yyDay = tm->tm_mday; | |
1e9ba8f2 | 894 | yyTimezone = tzoff; |
e1a085ba A |
895 | yyDSTmode = DSTmaybe; |
896 | yyHour = 0; | |
897 | yyMinutes = 0; | |
898 | yySeconds = 0; | |
899 | yyMeridian = MER24; | |
900 | yyRelSeconds = 0; | |
901 | yyRelMonth = 0; | |
902 | yyHaveDate = 0; | |
903 | yyHaveDay = 0; | |
904 | yyHaveRel = 0; | |
905 | yyHaveTime = 0; | |
906 | yyHaveZone = 0; | |
907 | ||
908 | if (yyparse() | |
909 | || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1) | |
910 | return -1; | |
911 | ||
912 | if (yyHaveDate || yyHaveTime || yyHaveDay) { | |
913 | Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds, | |
914 | yyMeridian, yyDSTmode); | |
915 | if (Start < 0) | |
916 | return -1; | |
917 | } | |
918 | else { | |
919 | Start = nowtime; | |
920 | if (!yyHaveRel) | |
921 | Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec; | |
922 | } | |
923 | ||
924 | Start += yyRelSeconds; | |
925 | Start += RelativeMonth(Start, yyRelMonth); | |
926 | ||
927 | if (yyHaveDay && !yyHaveDate) { | |
928 | tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber); | |
929 | Start += tod; | |
930 | } | |
931 | ||
932 | /* Have to do *something* with a legitimate -1 so it's distinguishable | |
933 | * from the error return value. (Alternately could set errno on error.) */ | |
934 | return Start == -1 ? 0 : Start; | |
935 | } | |
936 | ||
937 | ||
938 | #if defined(TEST) | |
939 | ||
940 | /* ARGSUSED */ | |
941 | int | |
942 | main(int ac, char *av[]) | |
943 | { | |
944 | char buff[128]; | |
945 | time_t d; | |
946 | ||
947 | (void)printf("Enter date, or blank line to exit.\n\t> "); | |
948 | (void)fflush(stdout); | |
949 | while (gets(buff) && buff[0]) { | |
1e9ba8f2 | 950 | d = get_date(buff); |
e1a085ba A |
951 | if (d == -1) |
952 | (void)printf("Bad format - couldn't convert.\n"); | |
953 | else | |
954 | (void)printf("%s", ctime(&d)); | |
955 | (void)printf("\t> "); | |
956 | (void)fflush(stdout); | |
957 | } | |
958 | exit(0); | |
959 | /* NOTREACHED */ | |
960 | } | |
961 | #endif /* defined(TEST) */ |