Commit | Line | Data |
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574495fc | 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 13 shift/reduce conflicts. | |
9 | ** | |
10 | ** This code is in the public domain and has no copyright. | |
11 | ** | |
12 | ** Since butchered by Mark Wooding, 1999-03-07. | |
13 | */ | |
14 | ||
15 | #include <stdio.h> | |
16 | #include <ctype.h> | |
c7c126d4 | 17 | #include <stdlib.h> |
574495fc | 18 | |
19 | #define ISSPACE(c) (isspace ((unsigned char)c)) | |
20 | #define ISALPHA(c) (isalpha ((unsigned char)c)) | |
21 | #define ISUPPER(c) (isupper ((unsigned char)c)) | |
22 | #define ISDIGIT_LOCALE(c) ((unsigned char)isdigit (c)) | |
23 | ||
24 | /* ISDIGIT differs from ISDIGIT_LOCALE, as follows: | |
25 | - Its arg may be any int or unsigned int; it need not be an unsigned char. | |
26 | - It's guaranteed to evaluate its argument exactly once. | |
27 | - It's typically faster. | |
28 | Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that | |
29 | only '0' through '9' are digits. Prefer ISDIGIT to ISDIGIT_LOCALE unless | |
30 | it's important to use the locale's definition of `digit' even when the | |
31 | host does not conform to Posix. */ | |
32 | #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) | |
33 | ||
34 | #include "getdate.h" | |
35 | ||
36 | #include <string.h> | |
37 | ||
38 | /* Some old versions of bison generate parsers that use bcopy. | |
39 | That loses on systems that don't provide the function, so we have | |
40 | to redefine it here. (Assume everyone has memcpy -- [mdw]) */ | |
41 | ||
42 | #define bcopy(from, to, len) memcpy ((to), (from), (len)) | |
43 | ||
44 | /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc), | |
45 | as well as gratuitiously global symbol names, so we can have multiple | |
46 | yacc generated parsers in the same program. Note that these are only | |
47 | the variables produced by yacc. If other parser generators (bison, | |
48 | byacc, etc) produce additional global names that conflict at link time, | |
49 | then those parser generators need to be fixed instead of adding those | |
50 | names to this list. */ | |
51 | ||
52 | #define yymaxdepth gd_maxdepth | |
53 | #define yyparse gd_parse | |
54 | #define yylex gd_lex | |
55 | #define yyerror gd_error | |
56 | #define yylval gd_lval | |
57 | #define yychar gd_char | |
58 | #define yydebug gd_debug | |
59 | #define yypact gd_pact | |
60 | #define yyr1 gd_r1 | |
61 | #define yyr2 gd_r2 | |
62 | #define yydef gd_def | |
63 | #define yychk gd_chk | |
64 | #define yypgo gd_pgo | |
65 | #define yyact gd_act | |
66 | #define yyexca gd_exca | |
67 | #define yyerrflag gd_errflag | |
68 | #define yynerrs gd_nerrs | |
69 | #define yyps gd_ps | |
70 | #define yypv gd_pv | |
71 | #define yys gd_s | |
72 | #define yy_yys gd_yys | |
73 | #define yystate gd_state | |
74 | #define yytmp gd_tmp | |
75 | #define yyv gd_v | |
76 | #define yy_yyv gd_yyv | |
77 | #define yyval gd_val | |
78 | #define yylloc gd_lloc | |
79 | #define yyreds gd_reds /* With YYDEBUG defined */ | |
80 | #define yytoks gd_toks /* With YYDEBUG defined */ | |
81 | #define yylhs gd_yylhs | |
82 | #define yylen gd_yylen | |
83 | #define yydefred gd_yydefred | |
84 | #define yydgoto gd_yydgoto | |
85 | #define yysindex gd_yysindex | |
86 | #define yyrindex gd_yyrindex | |
87 | #define yygindex gd_yygindex | |
88 | #define yytable gd_yytable | |
89 | #define yycheck gd_yycheck | |
90 | ||
91 | static int yylex (); | |
92 | static int yyerror (); | |
93 | ||
94 | #define EPOCH 1970 | |
2d13b3c8 | 95 | #define HOUR(x) ((time_t)(x) * 60) |
96 | #define SECSPERDAY (24L * 60L * 60L) | |
574495fc | 97 | |
98 | #define MAX_BUFF_LEN 128 /* size of buffer to read the date into */ | |
99 | ||
100 | /* | |
101 | ** An entry in the lexical lookup table. | |
102 | */ | |
103 | typedef struct _TABLE { | |
104 | const char *name; | |
105 | int type; | |
106 | int value; | |
107 | } TABLE; | |
108 | ||
109 | ||
110 | /* | |
111 | ** Meridian: am, pm, or 24-hour style. | |
112 | */ | |
113 | typedef enum _MERIDIAN { | |
114 | MERam, MERpm, MER24 | |
115 | } MERIDIAN; | |
116 | ||
117 | ||
118 | /* | |
119 | ** Global variables. We could get rid of most of these by using a good | |
120 | ** union as the yacc stack. (This routine was originally written before | |
121 | ** yacc had the %union construct.) Maybe someday; right now we only use | |
122 | ** the %union very rarely. | |
123 | */ | |
124 | static const char *yyInput; | |
125 | static int yyDayOrdinal; | |
126 | static int yyDayNumber; | |
127 | static int yyHaveDate; | |
128 | static int yyHaveDay; | |
129 | static int yyHaveRel; | |
130 | static int yyHaveTime; | |
131 | static int yyHaveZone; | |
132 | static int yyTimezone; | |
133 | static int yyDay; | |
134 | static int yyHour; | |
135 | static int yyMinutes; | |
136 | static int yyMonth; | |
137 | static int yySeconds; | |
138 | static int yyYear; | |
139 | static MERIDIAN yyMeridian; | |
140 | static int yyRelDay; | |
141 | static int yyRelHour; | |
142 | static int yyRelMinutes; | |
143 | static int yyRelMonth; | |
144 | static int yyRelSeconds; | |
145 | static int yyRelYear; | |
146 | ||
147 | %} | |
148 | ||
149 | %union { | |
150 | int Number; | |
151 | enum _MERIDIAN Meridian; | |
152 | } | |
153 | ||
154 | %token tAGO tDAY tDAY_UNIT tDAYZONE tDST tHOUR_UNIT tID | |
155 | %token tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT | |
156 | %token tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE | |
157 | ||
158 | %type <Number> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tMINUTE_UNIT | |
159 | %type <Number> tMONTH tMONTH_UNIT | |
160 | %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE | |
161 | %type <Meridian> tMERIDIAN o_merid | |
162 | ||
163 | %% | |
164 | ||
165 | spec : /* NULL */ | |
166 | | spec item | |
167 | ; | |
168 | ||
169 | item : time { | |
170 | yyHaveTime++; | |
171 | } | |
172 | | zone { | |
173 | yyHaveZone++; | |
174 | } | |
175 | | date { | |
176 | yyHaveDate++; | |
177 | } | |
178 | | day { | |
179 | yyHaveDay++; | |
180 | } | |
181 | | rel { | |
182 | yyHaveRel++; | |
183 | } | |
184 | | number | |
185 | ; | |
186 | ||
187 | time : tUNUMBER tMERIDIAN { | |
188 | yyHour = $1; | |
189 | yyMinutes = 0; | |
190 | yySeconds = 0; | |
191 | yyMeridian = $2; | |
192 | } | |
193 | | tUNUMBER ':' tUNUMBER o_merid { | |
194 | yyHour = $1; | |
195 | yyMinutes = $3; | |
196 | yySeconds = 0; | |
197 | yyMeridian = $4; | |
198 | } | |
199 | | tUNUMBER ':' tUNUMBER tSNUMBER { | |
200 | yyHour = $1; | |
201 | yyMinutes = $3; | |
202 | yyMeridian = MER24; | |
203 | yyHaveZone++; | |
204 | yyTimezone = ($4 < 0 | |
205 | ? -$4 % 100 + (-$4 / 100) * 60 | |
206 | : - ($4 % 100 + ($4 / 100) * 60)); | |
207 | } | |
208 | | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { | |
209 | yyHour = $1; | |
210 | yyMinutes = $3; | |
211 | yySeconds = $5; | |
212 | yyMeridian = $6; | |
213 | } | |
214 | | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { | |
215 | yyHour = $1; | |
216 | yyMinutes = $3; | |
217 | yySeconds = $5; | |
218 | yyMeridian = MER24; | |
219 | yyHaveZone++; | |
220 | yyTimezone = ($6 < 0 | |
221 | ? -$6 % 100 + (-$6 / 100) * 60 | |
222 | : - ($6 % 100 + ($6 / 100) * 60)); | |
223 | } | |
224 | ; | |
225 | ||
226 | zone : tZONE { | |
227 | yyTimezone = $1; | |
228 | } | |
229 | | tDAYZONE { | |
230 | yyTimezone = $1 - 60; | |
231 | } | |
232 | | | |
233 | tZONE tDST { | |
234 | yyTimezone = $1 - 60; | |
235 | } | |
236 | ; | |
237 | ||
238 | day : tDAY { | |
239 | yyDayOrdinal = 1; | |
240 | yyDayNumber = $1; | |
241 | } | |
242 | | tDAY ',' { | |
243 | yyDayOrdinal = 1; | |
244 | yyDayNumber = $1; | |
245 | } | |
246 | | tUNUMBER tDAY { | |
247 | yyDayOrdinal = $1; | |
248 | yyDayNumber = $2; | |
249 | } | |
250 | ; | |
251 | ||
252 | date : tUNUMBER '/' tUNUMBER { | |
253 | yyMonth = $1; | |
254 | yyDay = $3; | |
255 | } | |
256 | | tUNUMBER '/' tUNUMBER '/' tUNUMBER { | |
257 | /* Interpret as YYYY/MM/DD if $1 >= 1000, otherwise as MM/DD/YY. | |
258 | The goal in recognizing YYYY/MM/DD is solely to support legacy | |
259 | machine-generated dates like those in an RCS log listing. If | |
260 | you want portability, use the ISO 8601 format. */ | |
261 | if ($1 >= 1000) | |
262 | { | |
263 | yyYear = $1; | |
264 | yyMonth = $3; | |
265 | yyDay = $5; | |
266 | } | |
267 | else | |
268 | { | |
269 | yyMonth = $1; | |
270 | yyDay = $3; | |
271 | yyYear = $5; | |
272 | } | |
273 | } | |
274 | | tUNUMBER tSNUMBER tSNUMBER { | |
275 | /* ISO 8601 format. yyyy-mm-dd. */ | |
276 | yyYear = $1; | |
277 | yyMonth = -$2; | |
278 | yyDay = -$3; | |
279 | } | |
280 | | tUNUMBER tMONTH tSNUMBER { | |
281 | /* e.g. 17-JUN-1992. */ | |
282 | yyDay = $1; | |
283 | yyMonth = $2; | |
284 | yyYear = -$3; | |
285 | } | |
286 | | tMONTH tUNUMBER { | |
287 | yyMonth = $1; | |
288 | yyDay = $2; | |
289 | } | |
290 | | tMONTH tUNUMBER ',' tUNUMBER { | |
291 | yyMonth = $1; | |
292 | yyDay = $2; | |
293 | yyYear = $4; | |
294 | } | |
295 | | tUNUMBER tMONTH { | |
296 | yyMonth = $2; | |
297 | yyDay = $1; | |
298 | } | |
299 | | tUNUMBER tMONTH tUNUMBER { | |
300 | yyMonth = $2; | |
301 | yyDay = $1; | |
302 | yyYear = $3; | |
303 | } | |
304 | ; | |
305 | ||
306 | rel : relunit tAGO { | |
307 | yyRelSeconds = -yyRelSeconds; | |
308 | yyRelMinutes = -yyRelMinutes; | |
309 | yyRelHour = -yyRelHour; | |
310 | yyRelDay = -yyRelDay; | |
311 | yyRelMonth = -yyRelMonth; | |
312 | yyRelYear = -yyRelYear; | |
313 | } | |
314 | | relunit | |
315 | ; | |
316 | ||
317 | relunit : tUNUMBER tYEAR_UNIT { | |
318 | yyRelYear += $1 * $2; | |
319 | } | |
320 | | tSNUMBER tYEAR_UNIT { | |
321 | yyRelYear += $1 * $2; | |
322 | } | |
323 | | tYEAR_UNIT { | |
2d13b3c8 | 324 | yyRelYear += $1; |
574495fc | 325 | } |
326 | | tUNUMBER tMONTH_UNIT { | |
327 | yyRelMonth += $1 * $2; | |
328 | } | |
329 | | tSNUMBER tMONTH_UNIT { | |
330 | yyRelMonth += $1 * $2; | |
331 | } | |
332 | | tMONTH_UNIT { | |
2d13b3c8 | 333 | yyRelMonth += $1; |
574495fc | 334 | } |
335 | | tUNUMBER tDAY_UNIT { | |
336 | yyRelDay += $1 * $2; | |
337 | } | |
338 | | tSNUMBER tDAY_UNIT { | |
339 | yyRelDay += $1 * $2; | |
340 | } | |
341 | | tDAY_UNIT { | |
2d13b3c8 | 342 | yyRelDay += $1; |
574495fc | 343 | } |
344 | | tUNUMBER tHOUR_UNIT { | |
345 | yyRelHour += $1 * $2; | |
346 | } | |
347 | | tSNUMBER tHOUR_UNIT { | |
348 | yyRelHour += $1 * $2; | |
349 | } | |
350 | | tHOUR_UNIT { | |
2d13b3c8 | 351 | yyRelHour += $1; |
574495fc | 352 | } |
353 | | tUNUMBER tMINUTE_UNIT { | |
354 | yyRelMinutes += $1 * $2; | |
355 | } | |
356 | | tSNUMBER tMINUTE_UNIT { | |
357 | yyRelMinutes += $1 * $2; | |
358 | } | |
359 | | tMINUTE_UNIT { | |
2d13b3c8 | 360 | yyRelMinutes += $1; |
574495fc | 361 | } |
362 | | tUNUMBER tSEC_UNIT { | |
363 | yyRelSeconds += $1 * $2; | |
364 | } | |
365 | | tSNUMBER tSEC_UNIT { | |
366 | yyRelSeconds += $1 * $2; | |
367 | } | |
368 | | tSEC_UNIT { | |
2d13b3c8 | 369 | yyRelSeconds += $1; |
574495fc | 370 | } |
371 | ; | |
372 | ||
373 | number : tUNUMBER | |
fcc208c5 | 374 | { |
574495fc | 375 | if (yyHaveTime && yyHaveDate && !yyHaveRel) |
376 | yyYear = $1; | |
377 | else | |
378 | { | |
379 | if ($1>10000) | |
380 | { | |
381 | yyHaveDate++; | |
382 | yyDay= ($1)%100; | |
383 | yyMonth= ($1/100)%100; | |
384 | yyYear = $1/10000; | |
385 | } | |
386 | else | |
387 | { | |
388 | yyHaveTime++; | |
389 | if ($1 < 100) | |
390 | { | |
391 | yyHour = $1; | |
392 | yyMinutes = 0; | |
393 | } | |
394 | else | |
395 | { | |
fcc208c5 MW |
396 | yyHour = $1 / 100; |
397 | yyMinutes = $1 % 100; | |
574495fc | 398 | } |
399 | yySeconds = 0; | |
400 | yyMeridian = MER24; | |
401 | } | |
402 | } | |
403 | } | |
404 | ; | |
405 | ||
406 | o_merid : /* NULL */ | |
407 | { | |
408 | $$ = MER24; | |
409 | } | |
410 | | tMERIDIAN | |
411 | { | |
412 | $$ = $1; | |
413 | } | |
414 | ; | |
415 | ||
416 | %% | |
417 | ||
418 | /* Month and day table. */ | |
419 | static TABLE const MonthDayTable[] = { | |
420 | { "january", tMONTH, 1 }, | |
421 | { "february", tMONTH, 2 }, | |
422 | { "march", tMONTH, 3 }, | |
423 | { "april", tMONTH, 4 }, | |
424 | { "may", tMONTH, 5 }, | |
425 | { "june", tMONTH, 6 }, | |
426 | { "july", tMONTH, 7 }, | |
427 | { "august", tMONTH, 8 }, | |
428 | { "september", tMONTH, 9 }, | |
429 | { "sept", tMONTH, 9 }, | |
430 | { "october", tMONTH, 10 }, | |
431 | { "november", tMONTH, 11 }, | |
432 | { "december", tMONTH, 12 }, | |
433 | { "sunday", tDAY, 0 }, | |
434 | { "monday", tDAY, 1 }, | |
435 | { "tuesday", tDAY, 2 }, | |
436 | { "tues", tDAY, 2 }, | |
437 | { "wednesday", tDAY, 3 }, | |
438 | { "wednes", tDAY, 3 }, | |
439 | { "thursday", tDAY, 4 }, | |
440 | { "thur", tDAY, 4 }, | |
441 | { "thurs", tDAY, 4 }, | |
442 | { "friday", tDAY, 5 }, | |
443 | { "saturday", tDAY, 6 }, | |
444 | { NULL } | |
445 | }; | |
446 | ||
447 | /* Time units table. */ | |
448 | static TABLE const UnitsTable[] = { | |
449 | { "year", tYEAR_UNIT, 1 }, | |
450 | { "month", tMONTH_UNIT, 1 }, | |
451 | { "fortnight", tDAY_UNIT, 14 }, | |
452 | { "week", tDAY_UNIT, 7 }, | |
453 | { "day", tDAY_UNIT, 1 }, | |
454 | { "hour", tHOUR_UNIT, 1 }, | |
455 | { "minute", tMINUTE_UNIT, 1 }, | |
456 | { "min", tMINUTE_UNIT, 1 }, | |
457 | { "second", tSEC_UNIT, 1 }, | |
458 | { "sec", tSEC_UNIT, 1 }, | |
459 | { NULL } | |
460 | }; | |
461 | ||
462 | /* Assorted relative-time words. */ | |
463 | static TABLE const OtherTable[] = { | |
464 | { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, | |
465 | { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, | |
466 | { "today", tMINUTE_UNIT, 0 }, | |
467 | { "now", tMINUTE_UNIT, 0 }, | |
468 | { "last", tUNUMBER, -1 }, | |
469 | { "this", tMINUTE_UNIT, 0 }, | |
2d13b3c8 | 470 | { "next", tUNUMBER, 1 /* Was bogusly 2 [mdw] */ }, |
574495fc | 471 | { "first", tUNUMBER, 1 }, |
472 | /* { "second", tUNUMBER, 2 }, */ | |
473 | { "third", tUNUMBER, 3 }, | |
474 | { "fourth", tUNUMBER, 4 }, | |
475 | { "fifth", tUNUMBER, 5 }, | |
476 | { "sixth", tUNUMBER, 6 }, | |
477 | { "seventh", tUNUMBER, 7 }, | |
478 | { "eighth", tUNUMBER, 8 }, | |
479 | { "ninth", tUNUMBER, 9 }, | |
480 | { "tenth", tUNUMBER, 10 }, | |
481 | { "eleventh", tUNUMBER, 11 }, | |
482 | { "twelfth", tUNUMBER, 12 }, | |
483 | { "ago", tAGO, 1 }, | |
484 | { NULL } | |
485 | }; | |
486 | ||
487 | /* The timezone table. */ | |
488 | static TABLE const TimezoneTable[] = { | |
489 | { "gmt", tZONE, HOUR ( 0) }, /* Greenwich Mean */ | |
490 | { "ut", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */ | |
491 | { "utc", tZONE, HOUR ( 0) }, | |
492 | { "wet", tZONE, HOUR ( 0) }, /* Western European */ | |
493 | { "bst", tDAYZONE, HOUR ( 0) }, /* British Summer */ | |
494 | { "wat", tZONE, HOUR ( 1) }, /* West Africa */ | |
495 | { "at", tZONE, HOUR ( 2) }, /* Azores */ | |
496 | #if 0 | |
497 | /* For completeness. BST is also British Summer, and GST is | |
498 | * also Guam Standard. */ | |
499 | { "bst", tZONE, HOUR ( 3) }, /* Brazil Standard */ | |
500 | { "gst", tZONE, HOUR ( 3) }, /* Greenland Standard */ | |
501 | #endif | |
502 | #if 0 | |
503 | { "nft", tZONE, HOUR (3.5) }, /* Newfoundland */ | |
504 | { "nst", tZONE, HOUR (3.5) }, /* Newfoundland Standard */ | |
505 | { "ndt", tDAYZONE, HOUR (3.5) }, /* Newfoundland Daylight */ | |
506 | #endif | |
507 | { "ast", tZONE, HOUR ( 4) }, /* Atlantic Standard */ | |
508 | { "adt", tDAYZONE, HOUR ( 4) }, /* Atlantic Daylight */ | |
509 | { "est", tZONE, HOUR ( 5) }, /* Eastern Standard */ | |
510 | { "edt", tDAYZONE, HOUR ( 5) }, /* Eastern Daylight */ | |
511 | { "cst", tZONE, HOUR ( 6) }, /* Central Standard */ | |
512 | { "cdt", tDAYZONE, HOUR ( 6) }, /* Central Daylight */ | |
513 | { "mst", tZONE, HOUR ( 7) }, /* Mountain Standard */ | |
514 | { "mdt", tDAYZONE, HOUR ( 7) }, /* Mountain Daylight */ | |
515 | { "pst", tZONE, HOUR ( 8) }, /* Pacific Standard */ | |
516 | { "pdt", tDAYZONE, HOUR ( 8) }, /* Pacific Daylight */ | |
517 | { "yst", tZONE, HOUR ( 9) }, /* Yukon Standard */ | |
518 | { "ydt", tDAYZONE, HOUR ( 9) }, /* Yukon Daylight */ | |
519 | { "hst", tZONE, HOUR (10) }, /* Hawaii Standard */ | |
520 | { "hdt", tDAYZONE, HOUR (10) }, /* Hawaii Daylight */ | |
521 | { "cat", tZONE, HOUR (10) }, /* Central Alaska */ | |
522 | { "ahst", tZONE, HOUR (10) }, /* Alaska-Hawaii Standard */ | |
523 | { "nt", tZONE, HOUR (11) }, /* Nome */ | |
524 | { "idlw", tZONE, HOUR (12) }, /* International Date Line West */ | |
525 | { "cet", tZONE, -HOUR (1) }, /* Central European */ | |
526 | { "met", tZONE, -HOUR (1) }, /* Middle European */ | |
527 | { "mewt", tZONE, -HOUR (1) }, /* Middle European Winter */ | |
528 | { "mest", tDAYZONE, -HOUR (1) }, /* Middle European Summer */ | |
529 | { "mesz", tDAYZONE, -HOUR (1) }, /* Middle European Summer */ | |
530 | { "swt", tZONE, -HOUR (1) }, /* Swedish Winter */ | |
531 | { "sst", tDAYZONE, -HOUR (1) }, /* Swedish Summer */ | |
532 | { "fwt", tZONE, -HOUR (1) }, /* French Winter */ | |
533 | { "fst", tDAYZONE, -HOUR (1) }, /* French Summer */ | |
534 | { "eet", tZONE, -HOUR (2) }, /* Eastern Europe, USSR Zone 1 */ | |
535 | { "bt", tZONE, -HOUR (3) }, /* Baghdad, USSR Zone 2 */ | |
536 | #if 0 | |
537 | { "it", tZONE, -HOUR (3.5) },/* Iran */ | |
538 | #endif | |
539 | { "zp4", tZONE, -HOUR (4) }, /* USSR Zone 3 */ | |
540 | { "zp5", tZONE, -HOUR (5) }, /* USSR Zone 4 */ | |
541 | #if 0 | |
542 | { "ist", tZONE, -HOUR (5.5) },/* Indian Standard */ | |
543 | #endif | |
544 | { "zp6", tZONE, -HOUR (6) }, /* USSR Zone 5 */ | |
545 | #if 0 | |
546 | /* For completeness. NST is also Newfoundland Standard, and SST is | |
547 | * also Swedish Summer. */ | |
548 | { "nst", tZONE, -HOUR (6.5) },/* North Sumatra */ | |
549 | { "sst", tZONE, -HOUR (7) }, /* South Sumatra, USSR Zone 6 */ | |
550 | #endif /* 0 */ | |
551 | { "wast", tZONE, -HOUR (7) }, /* West Australian Standard */ | |
552 | { "wadt", tDAYZONE, -HOUR (7) }, /* West Australian Daylight */ | |
553 | #if 0 | |
554 | { "jt", tZONE, -HOUR (7.5) },/* Java (3pm in Cronusland!) */ | |
555 | #endif | |
556 | { "cct", tZONE, -HOUR (8) }, /* China Coast, USSR Zone 7 */ | |
557 | { "jst", tZONE, -HOUR (9) }, /* Japan Standard, USSR Zone 8 */ | |
558 | #if 0 | |
559 | { "cast", tZONE, -HOUR (9.5) },/* Central Australian Standard */ | |
560 | { "cadt", tDAYZONE, -HOUR (9.5) },/* Central Australian Daylight */ | |
561 | #endif | |
562 | { "east", tZONE, -HOUR (10) }, /* Eastern Australian Standard */ | |
563 | { "eadt", tDAYZONE, -HOUR (10) }, /* Eastern Australian Daylight */ | |
564 | { "gst", tZONE, -HOUR (10) }, /* Guam Standard, USSR Zone 9 */ | |
565 | { "nzt", tZONE, -HOUR (12) }, /* New Zealand */ | |
566 | { "nzst", tZONE, -HOUR (12) }, /* New Zealand Standard */ | |
567 | { "nzdt", tDAYZONE, -HOUR (12) }, /* New Zealand Daylight */ | |
568 | { "idle", tZONE, -HOUR (12) }, /* International Date Line East */ | |
569 | { NULL } | |
570 | }; | |
571 | ||
572 | /* Military timezone table. */ | |
573 | static TABLE const MilitaryTable[] = { | |
574 | { "a", tZONE, HOUR ( 1) }, | |
575 | { "b", tZONE, HOUR ( 2) }, | |
576 | { "c", tZONE, HOUR ( 3) }, | |
577 | { "d", tZONE, HOUR ( 4) }, | |
578 | { "e", tZONE, HOUR ( 5) }, | |
579 | { "f", tZONE, HOUR ( 6) }, | |
580 | { "g", tZONE, HOUR ( 7) }, | |
581 | { "h", tZONE, HOUR ( 8) }, | |
582 | { "i", tZONE, HOUR ( 9) }, | |
583 | { "k", tZONE, HOUR ( 10) }, | |
584 | { "l", tZONE, HOUR ( 11) }, | |
585 | { "m", tZONE, HOUR ( 12) }, | |
586 | { "n", tZONE, HOUR (- 1) }, | |
587 | { "o", tZONE, HOUR (- 2) }, | |
588 | { "p", tZONE, HOUR (- 3) }, | |
589 | { "q", tZONE, HOUR (- 4) }, | |
590 | { "r", tZONE, HOUR (- 5) }, | |
591 | { "s", tZONE, HOUR (- 6) }, | |
592 | { "t", tZONE, HOUR (- 7) }, | |
593 | { "u", tZONE, HOUR (- 8) }, | |
594 | { "v", tZONE, HOUR (- 9) }, | |
595 | { "w", tZONE, HOUR (-10) }, | |
596 | { "x", tZONE, HOUR (-11) }, | |
597 | { "y", tZONE, HOUR (-12) }, | |
598 | { "z", tZONE, HOUR ( 0) }, | |
599 | { NULL } | |
600 | }; | |
601 | ||
602 | \f | |
603 | ||
604 | ||
605 | /* ARGSUSED */ | |
606 | static int | |
607 | yyerror (s) | |
608 | char *s; | |
609 | { | |
610 | return 0; | |
611 | } | |
612 | ||
613 | static int | |
614 | ToHour (Hours, Meridian) | |
615 | int Hours; | |
616 | MERIDIAN Meridian; | |
617 | { | |
618 | switch (Meridian) | |
619 | { | |
620 | case MER24: | |
621 | if (Hours < 0 || Hours > 23) | |
622 | return -1; | |
623 | return Hours; | |
624 | case MERam: | |
625 | if (Hours < 1 || Hours > 12) | |
626 | return -1; | |
627 | if (Hours == 12) | |
628 | Hours = 0; | |
629 | return Hours; | |
630 | case MERpm: | |
631 | if (Hours < 1 || Hours > 12) | |
632 | return -1; | |
633 | if (Hours == 12) | |
634 | Hours = 0; | |
635 | return Hours + 12; | |
636 | default: | |
637 | abort (); | |
638 | } | |
639 | /* NOTREACHED */ | |
640 | } | |
641 | ||
642 | static int | |
643 | ToYear (Year) | |
644 | int Year; | |
645 | { | |
646 | if (Year < 0) | |
647 | Year = -Year; | |
648 | ||
649 | /* XPG4 suggests that years 00-68 map to 2000-2068, and | |
650 | years 69-99 map to 1969-1999. */ | |
651 | if (Year < 69) | |
652 | Year += 2000; | |
653 | else if (Year < 100) | |
654 | Year += 1900; | |
655 | ||
656 | return Year; | |
657 | } | |
658 | ||
659 | static int | |
660 | LookupWord (buff) | |
661 | char *buff; | |
662 | { | |
663 | register char *p; | |
664 | register char *q; | |
665 | register const TABLE *tp; | |
666 | int i; | |
667 | int abbrev; | |
668 | ||
669 | /* Make it lowercase. */ | |
670 | for (p = buff; *p; p++) | |
671 | if (ISUPPER (*p)) | |
672 | *p = tolower (*p); | |
673 | ||
674 | if (strcmp (buff, "am") == 0 || strcmp (buff, "a.m.") == 0) | |
675 | { | |
676 | yylval.Meridian = MERam; | |
677 | return tMERIDIAN; | |
678 | } | |
679 | if (strcmp (buff, "pm") == 0 || strcmp (buff, "p.m.") == 0) | |
680 | { | |
681 | yylval.Meridian = MERpm; | |
682 | return tMERIDIAN; | |
683 | } | |
684 | ||
685 | /* See if we have an abbreviation for a month. */ | |
686 | if (strlen (buff) == 3) | |
687 | abbrev = 1; | |
688 | else if (strlen (buff) == 4 && buff[3] == '.') | |
689 | { | |
690 | abbrev = 1; | |
691 | buff[3] = '\0'; | |
692 | } | |
693 | else | |
694 | abbrev = 0; | |
695 | ||
696 | for (tp = MonthDayTable; tp->name; tp++) | |
697 | { | |
698 | if (abbrev) | |
699 | { | |
700 | if (strncmp (buff, tp->name, 3) == 0) | |
701 | { | |
702 | yylval.Number = tp->value; | |
703 | return tp->type; | |
704 | } | |
705 | } | |
706 | else if (strcmp (buff, tp->name) == 0) | |
707 | { | |
708 | yylval.Number = tp->value; | |
709 | return tp->type; | |
710 | } | |
711 | } | |
712 | ||
713 | for (tp = TimezoneTable; tp->name; tp++) | |
714 | if (strcmp (buff, tp->name) == 0) | |
715 | { | |
716 | yylval.Number = tp->value; | |
717 | return tp->type; | |
718 | } | |
719 | ||
720 | if (strcmp (buff, "dst") == 0) | |
721 | return tDST; | |
722 | ||
723 | for (tp = UnitsTable; tp->name; tp++) | |
724 | if (strcmp (buff, tp->name) == 0) | |
725 | { | |
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 | { | |
734 | buff[i] = '\0'; | |
735 | for (tp = UnitsTable; tp->name; tp++) | |
736 | if (strcmp (buff, tp->name) == 0) | |
737 | { | |
738 | yylval.Number = tp->value; | |
739 | return tp->type; | |
740 | } | |
741 | buff[i] = 's'; /* Put back for "this" in OtherTable. */ | |
742 | } | |
743 | ||
744 | for (tp = OtherTable; tp->name; tp++) | |
745 | if (strcmp (buff, tp->name) == 0) | |
746 | { | |
747 | yylval.Number = tp->value; | |
748 | return tp->type; | |
749 | } | |
750 | ||
751 | /* Military timezones. */ | |
752 | if (buff[1] == '\0' && ISALPHA (*buff)) | |
753 | { | |
754 | for (tp = MilitaryTable; tp->name; tp++) | |
755 | if (strcmp (buff, tp->name) == 0) | |
756 | { | |
757 | yylval.Number = tp->value; | |
758 | return tp->type; | |
759 | } | |
760 | } | |
761 | ||
762 | /* Drop out any periods and try the timezone table again. */ | |
763 | for (i = 0, p = q = buff; *q; q++) | |
764 | if (*q != '.') | |
765 | *p++ = *q; | |
766 | else | |
767 | i++; | |
768 | *p = '\0'; | |
769 | if (i) | |
770 | for (tp = TimezoneTable; tp->name; tp++) | |
771 | if (strcmp (buff, tp->name) == 0) | |
772 | { | |
773 | yylval.Number = tp->value; | |
774 | return tp->type; | |
775 | } | |
776 | ||
777 | return tID; | |
778 | } | |
779 | ||
780 | static int | |
781 | yylex () | |
782 | { | |
783 | register char c; | |
784 | register char *p; | |
785 | char buff[20]; | |
786 | int Count; | |
787 | int sign; | |
788 | ||
789 | for (;;) | |
790 | { | |
791 | while (ISSPACE (*yyInput)) | |
792 | yyInput++; | |
793 | ||
794 | if (ISDIGIT (c = *yyInput) || c == '-' || c == '+') | |
795 | { | |
796 | if (c == '-' || c == '+') | |
797 | { | |
798 | sign = c == '-' ? -1 : 1; | |
799 | if (!ISDIGIT (*++yyInput)) | |
800 | /* skip the '-' sign */ | |
801 | continue; | |
802 | } | |
803 | else | |
804 | sign = 0; | |
805 | for (yylval.Number = 0; ISDIGIT (c = *yyInput++);) | |
806 | yylval.Number = 10 * yylval.Number + c - '0'; | |
807 | yyInput--; | |
808 | if (sign < 0) | |
809 | yylval.Number = -yylval.Number; | |
810 | return sign ? tSNUMBER : tUNUMBER; | |
811 | } | |
812 | if (ISALPHA (c)) | |
813 | { | |
814 | for (p = buff; (c = *yyInput++, ISALPHA (c)) || c == '.';) | |
815 | if (p < &buff[sizeof buff - 1]) | |
816 | *p++ = c; | |
817 | *p = '\0'; | |
818 | yyInput--; | |
819 | return LookupWord (buff); | |
820 | } | |
821 | if (c != '(') | |
822 | return *yyInput++; | |
823 | Count = 0; | |
824 | do | |
825 | { | |
826 | c = *yyInput++; | |
827 | if (c == '\0') | |
828 | return c; | |
829 | if (c == '(') | |
830 | Count++; | |
831 | else if (c == ')') | |
832 | Count--; | |
833 | } | |
834 | while (Count > 0); | |
835 | } | |
836 | } | |
837 | ||
838 | #define TM_YEAR_ORIGIN 1900 | |
839 | ||
df66cb0f | 840 | #ifndef GETDATE_IGNORE_TIMEZONE |
841 | ||
574495fc | 842 | /* Yield A - B, measured in seconds. */ |
843 | static long | |
844 | difftm (a, b) | |
845 | struct tm *a, *b; | |
846 | { | |
847 | int ay = a->tm_year + (TM_YEAR_ORIGIN - 1); | |
848 | int by = b->tm_year + (TM_YEAR_ORIGIN - 1); | |
849 | long days = ( | |
850 | /* difference in day of year */ | |
851 | a->tm_yday - b->tm_yday | |
852 | /* + intervening leap days */ | |
853 | + ((ay >> 2) - (by >> 2)) | |
854 | - (ay / 100 - by / 100) | |
855 | + ((ay / 100 >> 2) - (by / 100 >> 2)) | |
856 | /* + difference in years * 365 */ | |
857 | + (long) (ay - by) * 365 | |
858 | ); | |
859 | return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) | |
860 | + (a->tm_min - b->tm_min)) | |
861 | + (a->tm_sec - b->tm_sec)); | |
862 | } | |
863 | ||
df66cb0f | 864 | #endif |
865 | ||
574495fc | 866 | time_t |
867 | get_date (p, now) | |
868 | const char *p; | |
869 | const time_t *now; | |
870 | { | |
871 | struct tm tm, tm0, *tmp; | |
872 | time_t Start; | |
873 | ||
874 | yyInput = p; | |
875 | Start = now ? *now : time ((time_t *) NULL); | |
876 | tmp = localtime (&Start); | |
877 | yyYear = tmp->tm_year + TM_YEAR_ORIGIN; | |
878 | yyMonth = tmp->tm_mon + 1; | |
879 | yyDay = tmp->tm_mday; | |
880 | yyHour = tmp->tm_hour; | |
881 | yyMinutes = tmp->tm_min; | |
882 | yySeconds = tmp->tm_sec; | |
883 | yyMeridian = MER24; | |
884 | yyRelSeconds = 0; | |
885 | yyRelMinutes = 0; | |
886 | yyRelHour = 0; | |
887 | yyRelDay = 0; | |
888 | yyRelMonth = 0; | |
889 | yyRelYear = 0; | |
890 | yyHaveDate = 0; | |
891 | yyHaveDay = 0; | |
892 | yyHaveRel = 0; | |
893 | yyHaveTime = 0; | |
894 | yyHaveZone = 0; | |
895 | ||
896 | if (yyparse () | |
897 | || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1) | |
898 | return -1; | |
899 | ||
900 | tm.tm_year = ToYear (yyYear) - TM_YEAR_ORIGIN + yyRelYear; | |
901 | tm.tm_mon = yyMonth - 1 + yyRelMonth; | |
902 | tm.tm_mday = yyDay + yyRelDay; | |
903 | if (yyHaveTime || (yyHaveRel && !yyHaveDate && !yyHaveDay)) | |
904 | { | |
905 | tm.tm_hour = ToHour (yyHour, yyMeridian); | |
906 | if (tm.tm_hour < 0) | |
907 | return -1; | |
908 | tm.tm_min = yyMinutes; | |
909 | tm.tm_sec = yySeconds; | |
910 | } | |
911 | else | |
912 | { | |
913 | tm.tm_hour = tm.tm_min = tm.tm_sec = 0; | |
914 | } | |
915 | tm.tm_hour += yyRelHour; | |
916 | tm.tm_min += yyRelMinutes; | |
917 | tm.tm_sec += yyRelSeconds; | |
918 | tm.tm_isdst = -1; | |
919 | tm0 = tm; | |
920 | ||
921 | Start = mktime (&tm); | |
922 | ||
923 | if (Start == (time_t) -1) | |
924 | { | |
925 | ||
926 | /* Guard against falsely reporting errors near the time_t boundaries | |
fcc208c5 MW |
927 | when parsing times in other time zones. For example, if the min |
928 | time_t value is 1970-01-01 00:00:00 UTC and we are 8 hours ahead | |
929 | of UTC, then the min localtime value is 1970-01-01 08:00:00; if | |
930 | we apply mktime to 1970-01-01 00:00:00 we will get an error, so | |
931 | we apply mktime to 1970-01-02 08:00:00 instead and adjust the time | |
932 | zone by 24 hours to compensate. This algorithm assumes that | |
933 | there is no DST transition within a day of the time_t boundaries. */ | |
574495fc | 934 | |
df66cb0f | 935 | #ifndef GETDATE_IGNORE_TIMEZONE |
574495fc | 936 | if (yyHaveZone) |
937 | { | |
938 | tm = tm0; | |
939 | if (tm.tm_year <= EPOCH - TM_YEAR_ORIGIN) | |
940 | { | |
941 | tm.tm_mday++; | |
942 | yyTimezone -= 24 * 60; | |
943 | } | |
944 | else | |
945 | { | |
946 | tm.tm_mday--; | |
947 | yyTimezone += 24 * 60; | |
948 | } | |
949 | Start = mktime (&tm); | |
950 | } | |
df66cb0f | 951 | #endif |
574495fc | 952 | |
953 | if (Start == (time_t) -1) | |
954 | return Start; | |
955 | } | |
956 | ||
957 | if (yyHaveDay && !yyHaveDate) | |
958 | { | |
959 | tm.tm_mday += ((yyDayNumber - tm.tm_wday + 7) % 7 | |
960 | + 7 * (yyDayOrdinal - (0 < yyDayOrdinal))); | |
961 | Start = mktime (&tm); | |
962 | if (Start == (time_t) -1) | |
963 | return Start; | |
964 | } | |
965 | ||
df66cb0f | 966 | #ifndef GETDATE_IGNORE_TIMEZONE |
574495fc | 967 | if (yyHaveZone) |
968 | { | |
969 | long delta = yyTimezone * 60L + difftm (&tm, gmtime (&Start)); | |
970 | if ((Start + delta < Start) != (delta < 0)) | |
971 | return -1; /* time_t overflow */ | |
972 | Start += delta; | |
973 | } | |
df66cb0f | 974 | #endif |
574495fc | 975 | |
976 | return Start; | |
977 | } | |
978 | ||
979 | #if defined (TEST) | |
980 | ||
981 | /* ARGSUSED */ | |
982 | int | |
983 | main (ac, av) | |
984 | int ac; | |
985 | char *av[]; | |
986 | { | |
987 | char buff[MAX_BUFF_LEN + 1]; | |
988 | time_t d; | |
989 | ||
990 | (void) printf ("Enter date, or blank line to exit.\n\t> "); | |
991 | (void) fflush (stdout); | |
992 | ||
993 | buff[MAX_BUFF_LEN] = 0; | |
994 | while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0]) | |
995 | { | |
996 | d = get_date (buff, (time_t *) NULL); | |
997 | if (d == -1) | |
998 | (void) printf ("Bad format - couldn't convert.\n"); | |
999 | else | |
1000 | (void) printf ("%s", ctime (&d)); | |
1001 | (void) printf ("\t> "); | |
1002 | (void) fflush (stdout); | |
1003 | } | |
1004 | exit (0); | |
1005 | /* NOTREACHED */ | |
1006 | } | |
1007 | #endif /* defined (TEST) */ |