Mercurial > hg > octave-kai > gnulib-hg
annotate lib/getdate.y @ 1929:f7d4ee7478d7
(get_date): Rename outermost local `probe' to `quarter'.
author | Jim Meyering <jim@meyering.net> |
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date | Sun, 29 Aug 1999 12:28:56 +0000 |
parents | 3119c326ccc8 |
children | 92632825178b |
rev | line source |
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9 | 1 %{ |
1928 | 2 /* Parse a string into an internal time stamp. |
3 Copyright 1999 Free Software Foundation, Inc. | |
4 | |
5 This program is free software; you can redistribute it and/or modify | |
6 it under the terms of the GNU General Public License as published by | |
7 the Free Software Foundation; either version 2, or (at your option) | |
8 any later version. | |
9 | |
10 This program is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 GNU General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU General Public License | |
16 along with this program; if not, write to the Free Software Foundation, | |
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
18 | |
19 /* Originally written by Steven M. Bellovin <smb@research.att.com> while | |
20 at the University of North Carolina at Chapel Hill. Later tweaked by | |
21 a couple of people on Usenet. Completely overhauled by Rich $alz | |
22 <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990. | |
23 | |
24 Modified by Paul Eggert <eggert@twinsun.com> in August 1999 to do | |
25 the right thing about local DST. Unlike previous versions, this | |
26 version is reentrant. */ | |
9 | 27 |
48 | 28 #ifdef HAVE_CONFIG_H |
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29 # include <config.h> |
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30 # ifdef HAVE_ALLOCA_H |
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31 # include <alloca.h> |
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32 # endif |
101 | 33 #endif |
48 | 34 |
100
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35 /* Since the code of getdate.y is not included in the Emacs executable |
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36 itself, there is no need to #define static in this file. Even if |
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37 the code were included in the Emacs executable, it probably |
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38 wouldn't do any harm to #undef it here; this will only cause |
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39 problems if we try to write to a static variable, which I don't |
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40 think this code needs to do. */ |
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41 #ifdef emacs |
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42 # undef static |
100
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43 #endif |
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44 |
9 | 45 #include <ctype.h> |
46 | |
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47 #if HAVE_STDLIB_H |
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48 # include <stdlib.h> /* for `free'; used by Bison 1.27 */ |
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49 #endif |
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50 |
1928 | 51 #if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII) |
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52 # define IN_CTYPE_DOMAIN(c) 1 |
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53 #else |
1928 | 54 # define IN_CTYPE_DOMAIN(c) isascii (c) |
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55 #endif |
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56 |
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57 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) |
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58 #define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c)) |
1928 | 59 #define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c)) |
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60 #define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c)) |
814 | 61 |
811
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62 /* ISDIGIT differs from ISDIGIT_LOCALE, as follows: |
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63 - Its arg may be any int or unsigned int; it need not be an unsigned char. |
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64 - It's guaranteed to evaluate its argument exactly once. |
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65 - It's typically faster. |
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66 Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that |
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67 only '0' through '9' are digits. Prefer ISDIGIT to ISDIGIT_LOCALE unless |
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68 it's important to use the locale's definition of `digit' even when the |
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69 host does not conform to Posix. */ |
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70 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) |
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71 |
1928 | 72 #if STDC_HEADERS || HAVE_STRING_H |
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73 # include <string.h> |
9 | 74 #endif |
75 | |
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76 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) |
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77 # define __attribute__(x) |
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78 #endif |
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79 |
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80 #ifndef ATTRIBUTE_UNUSED |
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81 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) |
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82 #endif |
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83 |
1928 | 84 #define EPOCH_YEAR 1970 |
85 #define TM_YEAR_ORIGIN 1900 | |
86 | |
87 #define HOUR(x) ((x) * 60) | |
100
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88 |
1928 | 89 /* An entry in the lexical lookup table. */ |
90 typedef struct | |
91 { | |
92 char const *name; | |
93 int type; | |
94 int value; | |
95 } table; | |
96 | |
97 /* Meridian: am, pm, or 24-hour style. */ | |
98 enum { MERam, MERpm, MER24 }; | |
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99 |
1928 | 100 /* Information passed to and from the parser. */ |
101 struct parser_control | |
102 { | |
103 /* The input string remaining to be parsed. */ | |
104 const char *input; | |
105 | |
106 /* N, if this is the Nth Tuesday. */ | |
107 int day_ordinal; | |
108 | |
109 /* Day of week; Sunday is 0. */ | |
110 int day_number; | |
111 | |
112 /* tm_isdst flag for the local zone. */ | |
113 int local_isdst; | |
114 | |
115 /* Time zone, in minutes east of UTC. */ | |
116 int time_zone; | |
9 | 117 |
1928 | 118 /* Style used for time. */ |
119 int meridian; | |
9 | 120 |
1928 | 121 /* Gregorian year, month, day, hour, minutes, and seconds. */ |
122 int year; | |
123 int month; | |
124 int day; | |
125 int hour; | |
126 int minutes; | |
127 int seconds; | |
9 | 128 |
1928 | 129 /* Relative year, month, day, hour, minutes, and seconds. */ |
130 int rel_year; | |
131 int rel_month; | |
132 int rel_day; | |
133 int rel_hour; | |
134 int rel_minutes; | |
135 int rel_seconds; | |
9 | 136 |
1928 | 137 /* Counts of nonterminals of various flavors parsed so far. */ |
138 int dates_seen; | |
139 int days_seen; | |
140 int local_zones_seen; | |
141 int rels_seen; | |
142 int times_seen; | |
143 int zones_seen; | |
144 | |
145 /* Table of local time zone abbrevations, terminated by a null entry. */ | |
146 table local_time_zone_table[3]; | |
147 }; | |
148 | |
149 #define PC (* (struct parser_control *) parm) | |
150 #define YYLEX_PARAM parm | |
151 #define YYPARSE_PARAM parm | |
152 #define YYSTYPE int | |
153 | |
154 static int yyerror (); | |
155 static int yylex (); | |
9 | 156 |
157 %} | |
158 | |
1928 | 159 /* We want a reentrant parser. */ |
160 %pure_parser | |
161 | |
1203 | 162 /* This grammar has 13 shift/reduce conflicts. */ |
163 %expect 13 | |
164 | |
1928 | 165 %token tAGO tDAY tDAY_UNIT tDAYZONE tDST tHOUR_UNIT tID |
166 %token tLOCAL_ZONE tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT | |
167 %token tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE | |
9 | 168 |
169 %% | |
170 | |
1928 | 171 spec: |
172 /* empty */ | |
173 | spec item | |
174 ; | |
9 | 175 |
1928 | 176 item: |
177 time | |
178 { PC.times_seen++; } | |
179 | local_zone | |
180 { PC.local_zones_seen++; } | |
181 | zone | |
182 { PC.zones_seen++; } | |
183 | date | |
184 { PC.dates_seen++; } | |
185 | day | |
186 { PC.days_seen++; } | |
187 | rel | |
188 { PC.rels_seen++; } | |
189 | number | |
190 ; | |
9 | 191 |
1928 | 192 time: |
193 tUNUMBER tMERIDIAN | |
194 { | |
195 PC.hour = $1; | |
196 PC.minutes = 0; | |
197 PC.seconds = 0; | |
198 PC.meridian = $2; | |
199 } | |
200 | tUNUMBER ':' tUNUMBER o_merid | |
201 { | |
202 PC.hour = $1; | |
203 PC.minutes = $3; | |
204 PC.seconds = 0; | |
205 PC.meridian = $4; | |
206 } | |
207 | tUNUMBER ':' tUNUMBER tSNUMBER | |
208 { | |
209 PC.hour = $1; | |
210 PC.minutes = $3; | |
211 PC.meridian = MER24; | |
212 PC.zones_seen++; | |
213 PC.time_zone = $4 % 100 + ($4 / 100) * 60; | |
214 } | |
215 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid | |
216 { | |
217 PC.hour = $1; | |
218 PC.minutes = $3; | |
219 PC.seconds = $5; | |
220 PC.meridian = $6; | |
221 } | |
222 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER | |
223 { | |
224 PC.hour = $1; | |
225 PC.minutes = $3; | |
226 PC.seconds = $5; | |
227 PC.meridian = MER24; | |
228 PC.zones_seen++; | |
229 PC.time_zone = $6 % 100 + ($6 / 100) * 60; | |
230 } | |
231 ; | |
9 | 232 |
1928 | 233 local_zone: |
234 tLOCAL_ZONE | |
235 { PC.local_isdst = $1; } | |
236 | tLOCAL_ZONE tDST | |
237 { PC.local_isdst = $1 < 0 ? 1 : $1 + 1; } | |
238 ; | |
239 | |
240 zone: | |
241 tZONE | |
242 { PC.time_zone = $1; } | |
243 | tDAYZONE | |
244 { PC.time_zone = $1 + 60; } | |
245 | tZONE tDST | |
246 { PC.time_zone = $1 + 60; } | |
247 ; | |
9 | 248 |
1928 | 249 day: |
250 tDAY | |
251 { | |
252 PC.day_ordinal = 1; | |
253 PC.day_number = $1; | |
254 } | |
255 | tDAY ',' | |
256 { | |
257 PC.day_ordinal = 1; | |
258 PC.day_number = $1; | |
259 } | |
260 | tUNUMBER tDAY | |
261 { | |
262 PC.day_ordinal = $1; | |
263 PC.day_number = $2; | |
264 } | |
265 ; | |
9 | 266 |
1928 | 267 date: |
268 tUNUMBER '/' tUNUMBER | |
269 { | |
270 PC.month = $1; | |
271 PC.day = $3; | |
272 } | |
273 | tUNUMBER '/' tUNUMBER '/' tUNUMBER | |
274 { | |
275 /* Interpret as YYYY/MM/DD if 1000 <= $1, otherwise as MM/DD/YY. | |
276 The goal in recognizing YYYY/MM/DD is solely to support legacy | |
277 machine-generated dates like those in an RCS log listing. If | |
278 you want portability, use the ISO 8601 format. */ | |
279 if (1000 <= $1) | |
280 { | |
281 PC.year = $1; | |
282 PC.month = $3; | |
283 PC.day = $5; | |
284 } | |
285 else | |
286 { | |
287 PC.month = $1; | |
288 PC.day = $3; | |
289 PC.year = $5; | |
290 } | |
291 } | |
292 | tUNUMBER tSNUMBER tSNUMBER | |
293 { | |
294 /* ISO 8601 format. YYYY-MM-DD. */ | |
295 PC.year = $1; | |
296 PC.month = -$2; | |
297 PC.day = -$3; | |
298 } | |
299 | tUNUMBER tMONTH tSNUMBER | |
300 { | |
301 /* e.g. 17-JUN-1992. */ | |
302 PC.day = $1; | |
303 PC.month = $2; | |
304 PC.year = -$3; | |
305 } | |
306 | tMONTH tUNUMBER | |
307 { | |
308 PC.month = $1; | |
309 PC.day = $2; | |
310 } | |
311 | tMONTH tUNUMBER ',' tUNUMBER | |
312 { | |
313 PC.month = $1; | |
314 PC.day = $2; | |
315 PC.year = $4; | |
316 } | |
317 | tUNUMBER tMONTH | |
318 { | |
319 PC.month = $2; | |
320 PC.day = $1; | |
321 } | |
322 | tUNUMBER tMONTH tUNUMBER | |
323 { | |
324 PC.month = $2; | |
325 PC.day = $1; | |
326 PC.year = $3; | |
327 } | |
328 ; | |
9 | 329 |
1928 | 330 rel: |
331 relunit tAGO | |
332 { | |
333 PC.rel_seconds = -PC.rel_seconds; | |
334 PC.rel_minutes = -PC.rel_minutes; | |
335 PC.rel_hour = -PC.rel_hour; | |
336 PC.rel_day = -PC.rel_day; | |
337 PC.rel_month = -PC.rel_month; | |
338 PC.rel_year = -PC.rel_year; | |
339 } | |
340 | relunit | |
341 ; | |
9 | 342 |
1928 | 343 relunit: |
344 tUNUMBER tYEAR_UNIT | |
345 { PC.rel_year += $1 * $2; } | |
346 | tSNUMBER tYEAR_UNIT | |
347 { PC.rel_year += $1 * $2; } | |
348 | tYEAR_UNIT | |
349 { PC.rel_year += $1; } | |
350 | tUNUMBER tMONTH_UNIT | |
351 { PC.rel_month += $1 * $2; } | |
352 | tSNUMBER tMONTH_UNIT | |
353 { PC.rel_month += $1 * $2; } | |
354 | tMONTH_UNIT | |
355 { PC.rel_month += $1; } | |
356 | tUNUMBER tDAY_UNIT | |
357 { PC.rel_day += $1 * $2; } | |
358 | tSNUMBER tDAY_UNIT | |
359 { PC.rel_day += $1 * $2; } | |
360 | tDAY_UNIT | |
361 { PC.rel_day += $1; } | |
362 | tUNUMBER tHOUR_UNIT | |
363 { PC.rel_hour += $1 * $2; } | |
364 | tSNUMBER tHOUR_UNIT | |
365 { PC.rel_hour += $1 * $2; } | |
366 | tHOUR_UNIT | |
367 { PC.rel_hour += $1; } | |
368 | tUNUMBER tMINUTE_UNIT | |
369 { PC.rel_minutes += $1 * $2; } | |
370 | tSNUMBER tMINUTE_UNIT | |
371 { PC.rel_minutes += $1 * $2; } | |
372 | tMINUTE_UNIT | |
373 { PC.rel_minutes += $1; } | |
374 | tUNUMBER tSEC_UNIT | |
375 { PC.rel_seconds += $1 * $2; } | |
376 | tSNUMBER tSEC_UNIT | |
377 { PC.rel_seconds += $1 * $2; } | |
378 | tSEC_UNIT | |
379 { PC.rel_seconds += $1; } | |
380 ; | |
9 | 381 |
1928 | 382 number: |
383 tUNUMBER | |
384 { | |
385 if (PC.dates_seen && ! PC.rels_seen && (PC.times_seen || 100 <= $1)) | |
386 PC.year = $1; | |
387 else | |
388 { | |
389 if (10000 < $1) | |
390 { | |
391 PC.dates_seen++; | |
392 PC.day = $1 % 100; | |
393 PC.month = ($1 / 100) % 100; | |
394 PC.year = $1 / 10000; | |
395 } | |
857 | 396 else |
397 { | |
1928 | 398 PC.times_seen++; |
399 if ($1 < 100) | |
857 | 400 { |
1928 | 401 PC.hour = $1; |
402 PC.minutes = 0; | |
857 | 403 } |
404 else | |
405 { | |
1928 | 406 PC.hour = $1 / 100; |
407 PC.minutes = $1 % 100; | |
857 | 408 } |
1928 | 409 PC.seconds = 0; |
410 PC.meridian = MER24; | |
857 | 411 } |
412 } | |
1928 | 413 } |
414 ; | |
9 | 415 |
1928 | 416 o_merid: |
417 /* empty */ | |
418 { $$ = MER24; } | |
419 | tMERIDIAN | |
420 { $$ = $1; } | |
421 ; | |
9 | 422 |
423 %% | |
424 | |
1203 | 425 /* Include this file down here because bison inserts code above which |
426 may define-away `const'. We want the prototype for get_date to have | |
1928 | 427 the same signature as the function definition. */ |
1265 | 428 #include "getdate.h" |
1203 | 429 |
1928 | 430 #ifndef gmtime |
431 struct tm *gmtime (); | |
432 #endif | |
433 #ifndef localtime | |
434 struct tm *localtime (); | |
435 #endif | |
436 #ifndef mktime | |
437 time_t mktime (); | |
438 #endif | |
1203 | 439 |
1928 | 440 static table const meridian_table[] = |
441 { | |
442 { "AM", tMERIDIAN, MERam }, | |
443 { "A.M.", tMERIDIAN, MERam }, | |
444 { "PM", tMERIDIAN, MERpm }, | |
445 { "P.M.", tMERIDIAN, MERpm }, | |
446 { 0, 0, 0 } | |
447 }; | |
448 | |
449 static table const dst_table[] = | |
450 { | |
451 { "DST", tDST, 0 } | |
9 | 452 }; |
453 | |
1928 | 454 static table const month_and_day_table[] = |
455 { | |
456 { "JANUARY", tMONTH, 1 }, | |
457 { "FEBRUARY", tMONTH, 2 }, | |
458 { "MARCH", tMONTH, 3 }, | |
459 { "APRIL", tMONTH, 4 }, | |
460 { "MAY", tMONTH, 5 }, | |
461 { "JUNE", tMONTH, 6 }, | |
462 { "JULY", tMONTH, 7 }, | |
463 { "AUGUST", tMONTH, 8 }, | |
464 { "SEPTEMBER",tMONTH, 9 }, | |
465 { "SEPT", tMONTH, 9 }, | |
466 { "OCTOBER", tMONTH, 10 }, | |
467 { "NOVEMBER", tMONTH, 11 }, | |
468 { "DECEMBER", tMONTH, 12 }, | |
469 { "SUNDAY", tDAY, 0 }, | |
470 { "MONDAY", tDAY, 1 }, | |
471 { "TUESDAY", tDAY, 2 }, | |
472 { "TUES", tDAY, 2 }, | |
473 { "WEDNESDAY",tDAY, 3 }, | |
474 { "WEDNES", tDAY, 3 }, | |
475 { "THURSDAY", tDAY, 4 }, | |
476 { "THUR", tDAY, 4 }, | |
477 { "THURS", tDAY, 4 }, | |
478 { "FRIDAY", tDAY, 5 }, | |
479 { "SATURDAY", tDAY, 6 }, | |
480 { 0, 0, 0 } | |
481 }; | |
482 | |
483 static table const time_units_table[] = | |
484 { | |
485 { "YEAR", tYEAR_UNIT, 1 }, | |
486 { "MONTH", tMONTH_UNIT, 1 }, | |
487 { "FORTNIGHT",tDAY_UNIT, 14 }, | |
488 { "WEEK", tDAY_UNIT, 7 }, | |
489 { "DAY", tDAY_UNIT, 1 }, | |
490 { "HOUR", tHOUR_UNIT, 1 }, | |
491 { "MINUTE", tMINUTE_UNIT, 1 }, | |
492 { "MIN", tMINUTE_UNIT, 1 }, | |
493 { "SECOND", tSEC_UNIT, 1 }, | |
494 { "SEC", tSEC_UNIT, 1 }, | |
495 { 0, 0, 0 } | |
9 | 496 }; |
497 | |
498 /* Assorted relative-time words. */ | |
1928 | 499 static table const relative_time_table[] = |
500 { | |
501 { "TOMORROW", tMINUTE_UNIT, 24 * 60 }, | |
502 { "YESTERDAY",tMINUTE_UNIT, - (24 * 60) }, | |
503 { "TODAY", tMINUTE_UNIT, 0 }, | |
504 { "NOW", tMINUTE_UNIT, 0 }, | |
505 { "LAST", tUNUMBER, -1 }, | |
506 { "THIS", tMINUTE_UNIT, 0 }, | |
507 { "NEXT", tUNUMBER, 1 }, | |
508 { "FIRST", tUNUMBER, 1 }, | |
509 /*{ "SECOND", tUNUMBER, 2 }, */ | |
510 { "THIRD", tUNUMBER, 3 }, | |
511 { "FOURTH", tUNUMBER, 4 }, | |
512 { "FIFTH", tUNUMBER, 5 }, | |
513 { "SIXTH", tUNUMBER, 6 }, | |
514 { "SEVENTH", tUNUMBER, 7 }, | |
515 { "EIGHTH", tUNUMBER, 8 }, | |
516 { "NINTH", tUNUMBER, 9 }, | |
517 { "TENTH", tUNUMBER, 10 }, | |
518 { "ELEVENTH", tUNUMBER, 11 }, | |
519 { "TWELFTH", tUNUMBER, 12 }, | |
520 { "AGO", tAGO, 1 }, | |
521 { 0, 0, 0 } | |
9 | 522 }; |
523 | |
1928 | 524 /* The time zone table. This table is necessarily incomplete, as time |
525 zone abbreviations are ambiguous; e.g. Australians interpret "EST" | |
526 as Eastern time in Australia, not as US Eastern Standard Time. | |
527 You cannot rely on getdate to handle arbitrary time zone | |
528 abbreviations; use numeric abbreviations like `-0500' instead. */ | |
529 static table const time_zone_table[] = | |
530 { | |
531 { "GMT", tZONE, HOUR ( 0) }, /* Greenwich Mean */ | |
532 { "UT", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */ | |
533 { "UTC", tZONE, HOUR ( 0) }, | |
534 { "WET", tZONE, HOUR ( 0) }, /* Western European */ | |
535 { "WEST", tDAYZONE, HOUR ( 0) }, /* Western European Summer */ | |
536 { "BST", tDAYZONE, HOUR ( 0) }, /* British Summer */ | |
537 { "ART", tZONE, -HOUR ( 3) }, /* Argentina */ | |
538 { "BRT", tZONE, -HOUR ( 3) }, /* Brazil */ | |
539 { "BRST", tDAYZONE, -HOUR ( 3) }, /* Brazil Summer */ | |
540 { "NST", tZONE, -(HOUR ( 3) + 30) }, /* Newfoundland Standard */ | |
541 { "NDT", tDAYZONE,-(HOUR ( 3) + 30) }, /* Newfoundland Daylight */ | |
542 { "AST", tZONE, -HOUR ( 4) }, /* Atlantic Standard */ | |
543 { "ADT", tDAYZONE, -HOUR ( 4) }, /* Atlantic Daylight */ | |
544 { "CLT", tZONE, -HOUR ( 4) }, /* Chile */ | |
545 { "CLST", tDAYZONE, -HOUR ( 4) }, /* Chile Summer */ | |
546 { "EST", tZONE, -HOUR ( 5) }, /* Eastern Standard */ | |
547 { "EDT", tDAYZONE, -HOUR ( 5) }, /* Eastern Daylight */ | |
548 { "CST", tZONE, -HOUR ( 6) }, /* Central Standard */ | |
549 { "CDT", tDAYZONE, -HOUR ( 6) }, /* Central Daylight */ | |
550 { "MST", tZONE, -HOUR ( 7) }, /* Mountain Standard */ | |
551 { "MDT", tDAYZONE, -HOUR ( 7) }, /* Mountain Daylight */ | |
552 { "PST", tZONE, -HOUR ( 8) }, /* Pacific Standard */ | |
553 { "PDT", tDAYZONE, -HOUR ( 8) }, /* Pacific Daylight */ | |
554 { "AKST", tZONE, -HOUR ( 9) }, /* Alaska Standard */ | |
555 { "AKDT", tDAYZONE, -HOUR ( 9) }, /* Alaska Daylight */ | |
556 { "HST", tZONE, -HOUR (10) }, /* Hawaii Standard */ | |
557 { "HAST", tZONE, -HOUR (10) }, /* Hawaii-Aleutian Standard */ | |
558 { "HADT", tDAYZONE, -HOUR (10) }, /* Hawaii-Aleutian Daylight */ | |
559 { "SST", tZONE, -HOUR (12) }, /* Samoa Standard */ | |
560 { "WAT", tZONE, HOUR ( 1) }, /* West Africa */ | |
561 { "CET", tZONE, HOUR ( 1) }, /* Central European */ | |
562 { "CEST", tDAYZONE, HOUR ( 1) }, /* Central European Summer */ | |
563 { "MET", tZONE, HOUR ( 1) }, /* Middle European */ | |
564 { "MEZ", tZONE, HOUR ( 1) }, /* Middle European */ | |
565 { "MEST", tDAYZONE, HOUR ( 1) }, /* Middle European Summer */ | |
566 { "MESZ", tDAYZONE, HOUR ( 1) }, /* Middle European Summer */ | |
567 { "EET", tZONE, HOUR ( 2) }, /* Eastern European */ | |
568 { "EEST", tDAYZONE, HOUR ( 2) }, /* Eastern European Summer */ | |
569 { "CAT", tZONE, HOUR ( 2) }, /* Central Africa */ | |
570 { "SAST", tZONE, HOUR ( 2) }, /* South Africa Standard */ | |
571 { "EAT", tZONE, HOUR ( 3) }, /* East Africa */ | |
572 { "MSK", tZONE, HOUR ( 3) }, /* Moscow */ | |
573 { "MSD", tDAYZONE, HOUR ( 3) }, /* Moscow Daylight */ | |
574 { "IST", tZONE, (HOUR ( 5) + 30) }, /* India Standard */ | |
575 { "SGT", tZONE, HOUR ( 8) }, /* Singapore */ | |
576 { "KST", tZONE, HOUR ( 9) }, /* Korea Standard */ | |
577 { "JST", tZONE, HOUR ( 9) }, /* Japan Standard */ | |
578 { "GST", tZONE, HOUR (10) }, /* Guam Standard */ | |
579 { "NZST", tZONE, HOUR (12) }, /* New Zealand Standard */ | |
580 { "NZDT", tDAYZONE, HOUR (12) }, /* New Zealand Daylight */ | |
581 { 0, 0, 0 } | |
9 | 582 }; |
583 | |
1928 | 584 /* Military time zone table. */ |
585 static table const military_table[] = | |
586 { | |
587 { "A", tZONE, -HOUR ( 1) }, | |
588 { "B", tZONE, -HOUR ( 2) }, | |
589 { "C", tZONE, -HOUR ( 3) }, | |
590 { "D", tZONE, -HOUR ( 4) }, | |
591 { "E", tZONE, -HOUR ( 5) }, | |
592 { "F", tZONE, -HOUR ( 6) }, | |
593 { "G", tZONE, -HOUR ( 7) }, | |
594 { "H", tZONE, -HOUR ( 8) }, | |
595 { "I", tZONE, -HOUR ( 9) }, | |
596 { "K", tZONE, -HOUR (10) }, | |
597 { "L", tZONE, -HOUR (11) }, | |
598 { "M", tZONE, -HOUR (12) }, | |
599 { "N", tZONE, HOUR ( 1) }, | |
600 { "O", tZONE, HOUR ( 2) }, | |
601 { "P", tZONE, HOUR ( 3) }, | |
602 { "Q", tZONE, HOUR ( 4) }, | |
603 { "R", tZONE, HOUR ( 5) }, | |
604 { "S", tZONE, HOUR ( 6) }, | |
605 { "T", tZONE, HOUR ( 7) }, | |
606 { "U", tZONE, HOUR ( 8) }, | |
607 { "V", tZONE, HOUR ( 9) }, | |
608 { "W", tZONE, HOUR (10) }, | |
609 { "X", tZONE, HOUR (11) }, | |
610 { "Y", tZONE, HOUR (12) }, | |
611 { "Z", tZONE, HOUR ( 0) }, | |
612 { 0, 0, 0 } | |
9 | 613 }; |
614 | |
615 | |
616 | |
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617 static int |
1928 | 618 to_hour (int hours, int meridian) |
9 | 619 { |
1928 | 620 switch (meridian) |
857 | 621 { |
622 case MER24: | |
1928 | 623 return 0 <= hours && hours < 24 ? hours : -1; |
857 | 624 case MERam: |
1928 | 625 return 0 < hours && hours < 12 ? hours : hours == 12 ? 0 : -1; |
857 | 626 case MERpm: |
1928 | 627 return 0 < hours && hours < 12 ? hours + 12 : hours == 12 ? 12 : -1; |
857 | 628 default: |
629 abort (); | |
630 } | |
303 | 631 /* NOTREACHED */ |
9 | 632 } |
633 | |
852
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634 static int |
1928 | 635 to_year (int year) |
9 | 636 { |
1928 | 637 if (year < 0) |
638 year = -year; | |
852
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639 |
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640 /* XPG4 suggests that years 00-68 map to 2000-2068, and |
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641 years 69-99 map to 1969-1999. */ |
1928 | 642 if (year < 69) |
643 year += 2000; | |
644 else if (year < 100) | |
645 year += 1900; | |
9 | 646 |
1928 | 647 return year; |
9 | 648 } |
649 | |
1928 | 650 static table const * |
651 lookup_zone (struct parser_control const *pc, char const *name) | |
9 | 652 { |
1928 | 653 table const *tp; |
857 | 654 |
1928 | 655 /* Try local zone abbreviations first; they're more likely to be right. */ |
656 for (tp = pc->local_time_zone_table; tp->name; tp++) | |
657 if (strcmp (name, tp->name) == 0) | |
658 return tp; | |
9 | 659 |
1928 | 660 for (tp = time_zone_table; tp->name; tp++) |
661 if (strcmp (name, tp->name) == 0) | |
662 return tp; | |
857 | 663 |
1928 | 664 return 0; |
9 | 665 } |
666 | |
1928 | 667 /* Yield A - B, measured in seconds. */ |
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668 static int |
1777 | 669 difftm (struct tm *a, struct tm *b) |
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670 { |
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671 int ay = a->tm_year + (TM_YEAR_ORIGIN - 1); |
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672 int by = b->tm_year + (TM_YEAR_ORIGIN - 1); |
1928 | 673 int days = ( |
857 | 674 /* difference in day of year */ |
675 a->tm_yday - b->tm_yday | |
676 /* + intervening leap days */ | |
677 + ((ay >> 2) - (by >> 2)) | |
678 - (ay / 100 - by / 100) | |
679 + ((ay / 100 >> 2) - (by / 100 >> 2)) | |
680 /* + difference in years * 365 */ | |
1928 | 681 + (int) (ay - by) * 365 |
857 | 682 ); |
683 return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) | |
684 + (a->tm_min - b->tm_min)) | |
207
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685 + (a->tm_sec - b->tm_sec)); |
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686 } |
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687 |
1928 | 688 static table const * |
689 lookup_word (struct parser_control const *pc, char *word) | |
690 { | |
691 char *p; | |
692 char *q; | |
693 size_t wordlen; | |
694 table const *tp; | |
695 int i; | |
696 int abbrev; | |
697 | |
698 /* Make it uppercase. */ | |
699 for (p = word; *p; p++) | |
700 if (ISLOWER ((unsigned char) *p)) | |
701 *p = toupper ((unsigned char) *p); | |
702 | |
703 for (tp = meridian_table; tp->name; tp++) | |
704 if (strcmp (word, tp->name) == 0) | |
705 return tp; | |
706 | |
707 /* See if we have an abbreviation for a month. */ | |
708 wordlen = strlen (word); | |
709 abbrev = wordlen == 3 || (wordlen == 4 && word[3] == '.'); | |
710 | |
711 for (tp = month_and_day_table; tp->name; tp++) | |
712 if ((abbrev ? strncmp (word, tp->name, 3) : strcmp (word, tp->name)) == 0) | |
713 return tp; | |
714 | |
715 if ((tp = lookup_zone (pc, word))) | |
716 return tp; | |
717 | |
718 if (strcmp (word, dst_table[0].name) == 0) | |
719 return dst_table; | |
720 | |
721 for (tp = time_units_table; tp->name; tp++) | |
722 if (strcmp (word, tp->name) == 0) | |
723 return tp; | |
724 | |
725 /* Strip off any plural and try the units table again. */ | |
726 if (word[wordlen - 1] == 'S') | |
727 { | |
728 word[wordlen - 1] = '\0'; | |
729 for (tp = time_units_table; tp->name; tp++) | |
730 if (strcmp (word, tp->name) == 0) | |
731 return tp; | |
732 word[wordlen - 1] = 'S'; /* For "this" in relative_time_table. */ | |
733 } | |
734 | |
735 for (tp = relative_time_table; tp->name; tp++) | |
736 if (strcmp (word, tp->name) == 0) | |
737 return tp; | |
738 | |
739 /* Military time zones. */ | |
740 if (wordlen == 1) | |
741 for (tp = military_table; tp->name; tp++) | |
742 if (word[0] == tp->name[0]) | |
743 return tp; | |
744 | |
745 /* Drop out any periods and try the time zone table again. */ | |
746 for (i = 0, p = q = word; (*p = *q); q++) | |
747 if (*q == '.') | |
748 i = 1; | |
749 else | |
750 p++; | |
751 if (i && (tp = lookup_zone (pc, word))) | |
752 return tp; | |
753 | |
754 return 0; | |
755 } | |
756 | |
757 static int | |
758 yylex (YYSTYPE *lvalp, struct parser_control *pc) | |
759 { | |
760 unsigned char c; | |
761 int count; | |
762 | |
763 for (;;) | |
764 { | |
765 while (c = *pc->input, ISSPACE (c)) | |
766 pc->input++; | |
767 | |
768 if (ISDIGIT (c) || c == '-' || c == '+') | |
769 { | |
770 int sign; | |
771 if (c == '-' || c == '+') | |
772 { | |
773 sign = c == '-' ? -1 : 1; | |
774 if (! ISDIGIT (*++pc->input)) | |
775 /* skip the '-' sign */ | |
776 continue; | |
777 } | |
778 else | |
779 sign = 0; | |
780 for (*lvalp = 0; ISDIGIT (c = *pc->input++);) | |
781 *lvalp = 10 * *lvalp + (c - '0'); | |
782 pc->input--; | |
783 if (sign < 0) | |
784 *lvalp = - *lvalp; | |
785 return sign ? tSNUMBER : tUNUMBER; | |
786 } | |
787 | |
788 if (ISALPHA (c)) | |
789 { | |
790 char buff[20]; | |
791 char *p = buff; | |
792 table const *tp; | |
793 | |
794 do | |
795 { | |
796 if (p < buff + sizeof buff - 1) | |
797 *p++ = c; | |
798 c = *++pc->input; | |
799 } | |
800 while (ISALPHA (c) || c == '.'); | |
801 | |
802 *p = '\0'; | |
803 tp = lookup_word (pc, buff); | |
804 if (! tp) | |
805 return tID; | |
806 *lvalp = tp->value; | |
807 return tp->type; | |
808 } | |
809 | |
810 if (c != '(') | |
811 return *pc->input++; | |
812 count = 0; | |
813 do | |
814 { | |
815 c = *pc->input++; | |
816 if (c == '\0') | |
817 return c; | |
818 if (c == '(') | |
819 count++; | |
820 else if (c == ')') | |
821 count--; | |
822 } | |
823 while (count > 0); | |
824 } | |
825 } | |
826 | |
827 /* Do nothing if the parser reports an error. */ | |
828 static int | |
829 yyerror (char *s ATTRIBUTE_UNUSED) | |
830 { | |
831 return 0; | |
832 } | |
833 | |
834 /* ?? */ | |
9 | 835 time_t |
1203 | 836 get_date (const char *p, const time_t *now) |
9 | 837 { |
1928 | 838 time_t Start = now ? *now : time (0); |
839 struct tm *tmp = localtime (&Start); | |
840 struct tm tm; | |
841 struct tm tm0; | |
842 struct parser_control pc; | |
9 | 843 |
1928 | 844 if (! tmp) |
303 | 845 return -1; |
9 | 846 |
1928 | 847 pc.input = p; |
848 pc.year = tmp->tm_year + TM_YEAR_ORIGIN; | |
849 pc.month = tmp->tm_mon + 1; | |
850 pc.day = tmp->tm_mday; | |
851 pc.hour = tmp->tm_hour; | |
852 pc.minutes = tmp->tm_min; | |
853 pc.seconds = tmp->tm_sec; | |
854 tm.tm_isdst = tmp->tm_isdst; | |
855 | |
856 pc.meridian = MER24; | |
857 pc.rel_seconds = 0; | |
858 pc.rel_minutes = 0; | |
859 pc.rel_hour = 0; | |
860 pc.rel_day = 0; | |
861 pc.rel_month = 0; | |
862 pc.rel_year = 0; | |
863 pc.dates_seen = 0; | |
864 pc.days_seen = 0; | |
865 pc.rels_seen = 0; | |
866 pc.times_seen = 0; | |
867 pc.local_zones_seen = 0; | |
868 pc.zones_seen = 0; | |
869 | |
870 #if HAVE_TM_ZONE | |
871 pc.local_time_zone_table[0].name = tmp->tm_zone; | |
872 pc.local_time_zone_table[0].type = tLOCAL_ZONE; | |
873 pc.local_time_zone_table[0].value = tmp->tm_isdst; | |
874 pc.local_time_zone_table[1].name = 0; | |
875 | |
876 /* Probe the names used in the next three calendar quarters, looking | |
877 for a tm_isdst different from the one we already have. */ | |
878 { | |
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879 int quarter; |
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880 for (quarter = 1; quarter <= 3; quarter++) |
1928 | 881 { |
1929
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882 time_t probe = Start + quarter * (90 * 24 * 60 * 60); |
1928 | 883 struct tm *tm = localtime (&probe); |
884 if (tm && tm->tm_zone | |
885 && tm->tm_isdst != pc.local_time_zone_table[0].value) | |
886 { | |
887 { | |
888 pc.local_time_zone_table[1].name = tm->tm_zone; | |
889 pc.local_time_zone_table[1].type = tLOCAL_ZONE; | |
890 pc.local_time_zone_table[1].value = tm->tm_isdst; | |
891 pc.local_time_zone_table[2].name = 0; | |
892 } | |
893 break; | |
894 } | |
895 } | |
896 } | |
897 #else | |
898 #if HAVE_TZNAME | |
899 { | |
900 # ifndef tzname | |
901 extern char *tzname[]; | |
902 # endif | |
903 int i; | |
904 for (i = 0; i < 2; i++) | |
905 { | |
906 pc.local_time_zone_table[i].name = tzname[i]; | |
907 pc.local_time_zone_table[i].type = tLOCAL_ZONE; | |
908 pc.local_time_zone_table[i].value = i; | |
909 } | |
910 pc.local_time_zone_table[i].name = 0; | |
911 } | |
912 #else | |
913 pc.local_time_zone_table[0].name = 0; | |
914 #endif | |
915 #endif | |
916 | |
917 if (pc.local_time_zone_table[0].name && pc.local_time_zone_table[1].name | |
918 && ! strcmp (pc.local_time_zone_table[0].name, | |
919 pc.local_time_zone_table[1].name)) | |
857 | 920 { |
1928 | 921 /* This locale uses the same abbrevation for standard and |
922 daylight times. So if we see that abbreviation, we don't | |
923 know whether it's daylight time. */ | |
924 pc.local_time_zone_table[0].value = -1; | |
925 pc.local_time_zone_table[1].name = 0; | |
926 } | |
927 | |
928 if (yyparse (&pc) != 0 | |
929 || 1 < pc.times_seen || 1 < pc.dates_seen || 1 < pc.days_seen | |
930 || 1 < (pc.local_zones_seen + pc.zones_seen) | |
931 || (pc.local_zones_seen && 1 < pc.local_isdst)) | |
932 return -1; | |
933 | |
934 tm.tm_year = to_year (pc.year) - TM_YEAR_ORIGIN + pc.rel_year; | |
935 tm.tm_mon = pc.month - 1 + pc.rel_month; | |
936 tm.tm_mday = pc.day + pc.rel_day; | |
937 if (pc.times_seen || (pc.rels_seen && ! pc.dates_seen && ! pc.days_seen)) | |
938 { | |
939 tm.tm_hour = to_hour (pc.hour, pc.meridian); | |
857 | 940 if (tm.tm_hour < 0) |
941 return -1; | |
1928 | 942 tm.tm_min = pc.minutes; |
943 tm.tm_sec = pc.seconds; | |
857 | 944 } |
945 else | |
946 { | |
947 tm.tm_hour = tm.tm_min = tm.tm_sec = 0; | |
948 } | |
1928 | 949 tm.tm_hour += pc.rel_hour; |
950 tm.tm_min += pc.rel_minutes; | |
951 tm.tm_sec += pc.rel_seconds; | |
1850
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952 |
1928 | 953 /* Let mktime deduce tm_isdst if we have an absolute time stamp, |
954 or if the relative time stamp mentions days, months, or years. */ | |
955 if (pc.dates_seen | pc.days_seen | pc.times_seen | pc.rel_day | pc.rel_month | pc.rel_year) | |
1849
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956 tm.tm_isdst = -1; |
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957 |
1928 | 958 /* But if the input explicitly specifies local time with or without |
959 DST, give mktime that information. */ | |
960 if (pc.local_zones_seen) | |
961 tm.tm_isdst = pc.local_isdst; | |
962 | |
852
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963 tm0 = tm; |
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964 |
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965 Start = mktime (&tm); |
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966 |
857 | 967 if (Start == (time_t) -1) |
968 { | |
852
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969 |
857 | 970 /* Guard against falsely reporting errors near the time_t boundaries |
971 when parsing times in other time zones. For example, if the min | |
972 time_t value is 1970-01-01 00:00:00 UTC and we are 8 hours ahead | |
973 of UTC, then the min localtime value is 1970-01-01 08:00:00; if | |
974 we apply mktime to 1970-01-01 00:00:00 we will get an error, so | |
975 we apply mktime to 1970-01-02 08:00:00 instead and adjust the time | |
976 zone by 24 hours to compensate. This algorithm assumes that | |
977 there is no DST transition within a day of the time_t boundaries. */ | |
1928 | 978 if (pc.zones_seen) |
857 | 979 { |
980 tm = tm0; | |
1928 | 981 if (tm.tm_year <= EPOCH_YEAR - TM_YEAR_ORIGIN) |
857 | 982 { |
983 tm.tm_mday++; | |
1928 | 984 pc.time_zone += 24 * 60; |
857 | 985 } |
986 else | |
987 { | |
988 tm.tm_mday--; | |
1928 | 989 pc.time_zone -= 24 * 60; |
857 | 990 } |
991 Start = mktime (&tm); | |
992 } | |
993 | |
994 if (Start == (time_t) -1) | |
995 return Start; | |
852
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996 } |
855
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997 |
1928 | 998 if (pc.days_seen && ! pc.dates_seen) |
857 | 999 { |
1928 | 1000 tm.tm_mday += ((pc.day_number - tm.tm_wday + 7) % 7 |
1001 + 7 * (pc.day_ordinal - (0 < pc.day_ordinal))); | |
857 | 1002 Start = mktime (&tm); |
1003 if (Start == (time_t) -1) | |
1004 return Start; | |
1005 } | |
9 | 1006 |
1928 | 1007 if (pc.zones_seen) |
857 | 1008 { |
1928 | 1009 int delta; |
1761
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1010 struct tm *gmt = gmtime (&Start); |
1928 | 1011 if (! gmt) |
1761
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1012 return -1; |
1928 | 1013 delta = pc.time_zone * 60 + difftm (gmt, &tm); |
1014 if ((Start - delta < Start) != (delta < 0)) | |
1015 return -1; /* time_t overflow */ | |
1016 Start -= delta; | |
857 | 1017 } |
852
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1018 |
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1019 return Start; |
9 | 1020 } |
1021 | |
1928 | 1022 #if TEST |
9 | 1023 |
1928 | 1024 #include <stdio.h> |
1025 | |
202 | 1026 int |
1928 | 1027 main (int ac, char **av) |
9 | 1028 { |
1928 | 1029 char buff[BUFSIZ]; |
321 | 1030 time_t d; |
9 | 1031 |
1928 | 1032 printf ("Enter date, or blank line to exit.\n\t> "); |
1033 fflush (stdout); | |
321 | 1034 |
1928 | 1035 buff[BUFSIZ - 1] = 0; |
1036 while (fgets (buff, BUFSIZ - 1, stdin) && buff[0]) | |
857 | 1037 { |
1928 | 1038 d = get_date (buff, 0); |
1039 if (d == (time_t) -1) | |
1040 printf ("Bad format - couldn't convert.\n"); | |
857 | 1041 else |
1928 | 1042 printf ("%s", ctime (&d)); |
1043 printf ("\t> "); | |
1044 fflush (stdout); | |
857 | 1045 } |
1928 | 1046 return 0; |
9 | 1047 } |
1928 | 1048 #endif /* defined TEST */ |