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7088bd88 WP |
1 | %{ |
2 | /** | |
3 | * Parse a string into an internal timestamp. | |
4 | * | |
5 | * This file is based on gnulib parse-datetime.y-dd7a871 with | |
6 | * the other gnulib dependencies removed for use in util-linux. | |
7 | * | |
8 | * Copyright (C) 1999-2000, 2002-2017 Free Software Foundation, Inc. | |
9 | * | |
10 | * This program is free software: you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 3 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
22 | * | |
23 | * Originally written by Steven M. Bellovin <smb@research.att.com> while | |
24 | * at the University of North Carolina at Chapel Hill. Later tweaked by | |
25 | * a couple of people on Usenet. Completely overhauled by Rich $alz | |
26 | * <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990. | |
27 | * | |
28 | * Modified by Paul Eggert <eggert@twinsun.com> in August 1999 to do | |
29 | * the right thing about local DST. Also modified by Paul Eggert | |
30 | * <eggert@cs.ucla.edu> in February 2004 to support | |
31 | * nanosecond-resolution timestamps, and in October 2004 to support | |
32 | * TZ strings in dates. | |
33 | */ | |
34 | ||
35 | /** | |
36 | * FIXME: Check for arithmetic overflow in all cases, not just | |
37 | * some of them. | |
38 | */ | |
39 | ||
40 | #include <sys/time.h> | |
41 | #include <time.h> | |
42 | ||
43 | #include "c.h" | |
44 | #include "timeutils.h" | |
45 | ||
46 | /** | |
47 | * There's no need to extend the stack, so there's no need to involve | |
48 | * alloca. | |
49 | */ | |
50 | #define YYSTACK_USE_ALLOCA 0 | |
51 | ||
52 | /** | |
53 | * Tell Bison how much stack space is needed. 20 should be plenty for | |
54 | * this grammar, which is not right recursive. Beware setting it too | |
55 | * high, since that might cause problems on machines whose | |
56 | * implementations have lame stack-overflow checking. | |
57 | */ | |
58 | #define YYMAXDEPTH 20 | |
59 | #define YYINITDEPTH YYMAXDEPTH | |
60 | ||
61 | /** | |
62 | * Since the code of parse-datetime.y is not included in the Emacs executable | |
63 | * itself, there is no need to #define static in this file. Even if | |
64 | * the code were included in the Emacs executable, it probably | |
65 | * wouldn't do any harm to #undef it here; this will only cause | |
66 | * problems if we try to write to a static variable, which I don't | |
67 | * think this code needs to do. | |
68 | */ | |
69 | #ifdef emacs | |
70 | # undef static | |
71 | #endif | |
72 | ||
73 | #include <inttypes.h> | |
74 | #include <limits.h> | |
75 | #include <stdio.h> | |
76 | #include <stdlib.h> | |
77 | #include <string.h> | |
78 | ||
79 | ||
80 | #include <stdarg.h> | |
81 | #include "cctype.h" | |
82 | #include "nls.h" | |
7088bd88 WP |
83 | |
84 | /** | |
85 | * Bison's skeleton tests _STDLIB_H, while some stdlib.h headers | |
86 | * use _STDLIB_H_ as witness. Map the latter to the one bison uses. | |
87 | * FIXME: this is temporary. Remove when we have a mechanism to ensure | |
88 | * that the version we're using is fixed, too. | |
89 | */ | |
90 | #ifdef _STDLIB_H_ | |
91 | # undef _STDLIB_H | |
92 | # define _STDLIB_H 1 | |
93 | #endif | |
94 | ||
7088bd88 WP |
95 | /** |
96 | * Shift A right by B bits portably, by dividing A by 2**B and | |
97 | * truncating towards minus infinity. A and B should be free of side | |
98 | * effects, and B should be in the range 0 <= B <= INT_BITS - 2, where | |
99 | * INT_BITS is the number of useful bits in an int. GNU code can | |
100 | * assume that INT_BITS is at least 32. | |
101 | * | |
102 | * ISO C99 says that A >> B is implementation-defined if A < 0. Some | |
103 | * implementations (e.g., UNICOS 9.0 on a Cray Y-MP EL) don't shift | |
104 | * right in the usual way when A < 0, so SHR falls back on division if | |
105 | * ordinary A >> B doesn't seem to be the usual signed shift. | |
106 | */ | |
107 | #define SHR(a, b) \ | |
108 | (-1 >> 1 == -1 \ | |
109 | ? (a) >> (b) \ | |
110 | : (a) / (1 << (b)) - ((a) % (1 << (b)) < 0)) | |
111 | ||
7088bd88 WP |
112 | #define TM_YEAR_BASE 1900 |
113 | ||
114 | #define HOUR(x) ((x) * 60) | |
115 | ||
116 | #define STREQ(a, b) (strcmp (a, b) == 0) | |
117 | ||
118 | /** | |
119 | * Convert a possibly-signed character to an unsigned character. This is | |
120 | * a bit safer than casting to unsigned char, since it catches some type | |
121 | * errors that the cast doesn't. | |
122 | */ | |
123 | static unsigned char to_uchar (char ch) { return ch; } | |
124 | ||
125 | /** | |
126 | * FIXME: It also assumes that signed integer overflow silently wraps around, | |
127 | * but this is not true any more with recent versions of GCC 4. | |
128 | */ | |
129 | ||
130 | /** | |
131 | * An integer value, and the number of digits in its textual | |
132 | * representation. | |
133 | */ | |
134 | typedef struct { | |
135 | int negative; | |
960f98c9 | 136 | intmax_t value; |
7088bd88 WP |
137 | size_t digits; |
138 | } textint; | |
139 | ||
140 | /* An entry in the lexical lookup table. */ | |
141 | typedef struct { | |
142 | char const *name; | |
143 | int type; | |
144 | int value; | |
145 | } table; | |
146 | ||
147 | /* Meridian: am, pm, or 24-hour style. */ | |
148 | enum { MERam, MERpm, MER24 }; | |
149 | ||
150 | enum { BILLION = 1000000000, LOG10_BILLION = 9 }; | |
151 | ||
152 | /* Relative year, month, day, hour, minutes, seconds, and nanoseconds. */ | |
153 | typedef struct { | |
960f98c9 WP |
154 | intmax_t year; |
155 | intmax_t month; | |
156 | intmax_t day; | |
157 | intmax_t hour; | |
158 | intmax_t minutes; | |
7088bd88 | 159 | time_t seconds; |
75f8be9e | 160 | int ns; |
7088bd88 WP |
161 | } relative_time; |
162 | ||
163 | #if HAVE_COMPOUND_LITERALS | |
164 | # define RELATIVE_TIME_0 ((relative_time) { 0, 0, 0, 0, 0, 0, 0 }) | |
165 | #else | |
166 | static relative_time const RELATIVE_TIME_0; | |
167 | #endif | |
168 | ||
169 | /* Information passed to and from the parser. */ | |
170 | typedef struct { | |
171 | /* The input string remaining to be parsed. */ | |
172 | const char *input; | |
173 | ||
174 | /* N, if this is the Nth Tuesday. */ | |
960f98c9 | 175 | intmax_t day_ordinal; |
7088bd88 WP |
176 | |
177 | /* Day of week; Sunday is 0. */ | |
178 | int day_number; | |
179 | ||
180 | /* tm_isdst flag for the local zone. */ | |
181 | int local_isdst; | |
182 | ||
183 | /* Time zone, in minutes east of UTC. */ | |
75f8be9e | 184 | int time_zone; |
7088bd88 WP |
185 | |
186 | /* Style used for time. */ | |
187 | int meridian; | |
188 | ||
189 | /* Gregorian year, month, day, hour, minutes, seconds, and ns. */ | |
190 | textint year; | |
960f98c9 WP |
191 | intmax_t month; |
192 | intmax_t day; | |
193 | intmax_t hour; | |
194 | intmax_t minutes; | |
7088bd88 WP |
195 | struct timespec seconds; /* includes nanoseconds */ |
196 | ||
197 | /* Relative year, month, day, hour, minutes, seconds, and ns. */ | |
198 | relative_time rel; | |
199 | ||
200 | /* Presence or counts of some nonterminals parsed so far. */ | |
201 | int timespec_seen; | |
202 | int rels_seen; | |
203 | size_t dates_seen; | |
204 | size_t days_seen; | |
205 | size_t local_zones_seen; | |
206 | size_t dsts_seen; | |
207 | size_t times_seen; | |
208 | size_t zones_seen; | |
7088bd88 | 209 | |
7088bd88 WP |
210 | /* Table of local time zone abbreviations, null terminated. */ |
211 | table local_time_zone_table[3]; | |
212 | } parser_control; | |
213 | ||
214 | union YYSTYPE; | |
215 | static int yylex (union YYSTYPE *, parser_control *); | |
216 | static int yyerror (parser_control const *, char const *); | |
480d6bd8 | 217 | static int time_zone_hhmm (parser_control *, textint, textint); |
7088bd88 WP |
218 | |
219 | /** | |
220 | * Extract into *PC any date and time info from a string of digits | |
221 | * of the form e.g., YYYYMMDD, YYMMDD, HHMM, HH (and sometimes YYY, | |
222 | * YYYY, ...). | |
223 | */ | |
224 | static void digits_to_date_time(parser_control *pc, textint text_int) | |
225 | { | |
226 | if (pc->dates_seen && ! pc->year.digits | |
227 | && ! pc->rels_seen && (pc->times_seen || 2 < text_int.digits)) { | |
7088bd88 WP |
228 | pc->year = text_int; |
229 | } else { | |
230 | if (4 < text_int.digits) { | |
231 | pc->dates_seen++; | |
232 | pc->day = text_int.value % 100; | |
233 | pc->month = (text_int.value / 100) % 100; | |
234 | pc->year.value = text_int.value / 10000; | |
235 | pc->year.digits = text_int.digits - 4; | |
236 | } else { | |
237 | pc->times_seen++; | |
238 | if (text_int.digits <= 2) { | |
239 | pc->hour = text_int.value; | |
240 | pc->minutes = 0; | |
241 | } | |
242 | else { | |
243 | pc->hour = text_int.value / 100; | |
244 | pc->minutes = text_int.value % 100; | |
245 | } | |
246 | pc->seconds.tv_sec = 0; | |
247 | pc->seconds.tv_nsec = 0; | |
248 | pc->meridian = MER24; | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
253 | /* Increment PC->rel by FACTOR * REL (FACTOR is 1 or -1). */ | |
254 | static void apply_relative_time(parser_control *pc, relative_time rel, | |
255 | int factor) | |
256 | { | |
257 | pc->rel.ns += factor * rel.ns; | |
258 | pc->rel.seconds += factor * rel.seconds; | |
259 | pc->rel.minutes += factor * rel.minutes; | |
260 | pc->rel.hour += factor * rel.hour; | |
261 | pc->rel.day += factor * rel.day; | |
262 | pc->rel.month += factor * rel.month; | |
263 | pc->rel.year += factor * rel.year; | |
264 | pc->rels_seen = 1; | |
265 | } | |
266 | ||
267 | /* Set PC-> hour, minutes, seconds and nanoseconds members from arguments. */ | |
268 | static void | |
960f98c9 | 269 | set_hhmmss(parser_control *pc, intmax_t hour, intmax_t minutes, |
75f8be9e | 270 | time_t sec, int nsec) |
7088bd88 WP |
271 | { |
272 | pc->hour = hour; | |
273 | pc->minutes = minutes; | |
274 | pc->seconds.tv_sec = sec; | |
275 | pc->seconds.tv_nsec = nsec; | |
276 | } | |
277 | ||
278 | %} | |
279 | ||
280 | /** | |
281 | * We want a reentrant parser, even if the TZ manipulation and the calls to | |
282 | * localtime and gmtime are not reentrant. | |
283 | */ | |
284 | %pure-parser | |
285 | %parse-param { parser_control *pc } | |
286 | %lex-param { parser_control *pc } | |
287 | ||
288 | /* This grammar has 31 shift/reduce conflicts. */ | |
289 | %expect 31 | |
290 | ||
291 | %union { | |
960f98c9 | 292 | intmax_t intval; |
7088bd88 WP |
293 | textint textintval; |
294 | struct timespec timespec; | |
295 | relative_time rel; | |
296 | } | |
297 | ||
298 | %token <intval> tAGO | |
299 | %token tDST | |
300 | ||
301 | %token tYEAR_UNIT tMONTH_UNIT tHOUR_UNIT tMINUTE_UNIT tSEC_UNIT | |
302 | %token <intval> tDAY_UNIT tDAY_SHIFT | |
303 | ||
304 | %token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN | |
305 | %token <intval> tMONTH tORDINAL tZONE | |
306 | ||
307 | %token <textintval> tSNUMBER tUNUMBER | |
308 | %token <timespec> tSDECIMAL_NUMBER tUDECIMAL_NUMBER | |
309 | ||
480d6bd8 | 310 | %type <textintval> o_colon_minutes |
7088bd88 WP |
311 | %type <timespec> seconds signed_seconds unsigned_seconds |
312 | ||
313 | %type <rel> relunit relunit_snumber dayshift | |
314 | ||
315 | %% | |
316 | ||
317 | spec: | |
318 | timespec | |
319 | | items | |
320 | ; | |
321 | ||
322 | timespec: | |
323 | '@' seconds { | |
324 | pc->seconds = $2; | |
325 | pc->timespec_seen = 1; | |
326 | } | |
327 | ; | |
328 | ||
329 | items: | |
330 | /* empty */ | |
331 | | items item | |
332 | ; | |
333 | ||
334 | item: | |
335 | datetime { | |
336 | pc->times_seen++; pc->dates_seen++; | |
337 | } | |
338 | | time { | |
339 | pc->times_seen++; | |
340 | } | |
341 | | local_zone { | |
342 | pc->local_zones_seen++; | |
343 | } | |
344 | | zone { | |
345 | pc->zones_seen++; | |
346 | } | |
347 | | date { | |
348 | pc->dates_seen++; | |
349 | } | |
350 | | day { | |
351 | pc->days_seen++; | |
352 | } | |
353 | | rel | |
354 | | number | |
355 | | hybrid | |
356 | ; | |
357 | ||
358 | datetime: | |
359 | iso_8601_datetime | |
360 | ; | |
361 | ||
362 | iso_8601_datetime: | |
363 | iso_8601_date 'T' iso_8601_time | |
364 | ; | |
365 | ||
366 | time: | |
367 | tUNUMBER tMERIDIAN { | |
368 | set_hhmmss (pc, $1.value, 0, 0, 0); | |
369 | pc->meridian = $2; | |
370 | } | |
371 | | tUNUMBER ':' tUNUMBER tMERIDIAN { | |
372 | set_hhmmss (pc, $1.value, $3.value, 0, 0); | |
373 | pc->meridian = $4; | |
374 | } | |
375 | | tUNUMBER ':' tUNUMBER ':' unsigned_seconds tMERIDIAN { | |
376 | set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec); | |
377 | pc->meridian = $6; | |
378 | } | |
379 | | iso_8601_time | |
380 | ; | |
381 | ||
382 | iso_8601_time: | |
383 | tUNUMBER zone_offset { | |
384 | set_hhmmss (pc, $1.value, 0, 0, 0); | |
385 | pc->meridian = MER24; | |
386 | } | |
387 | | tUNUMBER ':' tUNUMBER o_zone_offset { | |
388 | set_hhmmss (pc, $1.value, $3.value, 0, 0); | |
389 | pc->meridian = MER24; | |
390 | } | |
391 | | tUNUMBER ':' tUNUMBER ':' unsigned_seconds o_zone_offset { | |
392 | set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec); | |
393 | pc->meridian = MER24; | |
394 | } | |
395 | ; | |
396 | ||
397 | o_zone_offset: | |
398 | /* empty */ | |
399 | | zone_offset | |
400 | ; | |
401 | ||
402 | zone_offset: | |
403 | tSNUMBER o_colon_minutes { | |
404 | pc->zones_seen++; | |
480d6bd8 | 405 | if (! time_zone_hhmm (pc, $1, $2)) YYABORT; |
7088bd88 WP |
406 | } |
407 | ; | |
408 | ||
409 | /** | |
410 | * Local zone strings only affect DST setting, | |
411 | * and only take affect if the current TZ setting is relevant. | |
412 | * | |
413 | * Example 1: | |
414 | * 'EEST' is parsed as tLOCAL_ZONE, as it relates to the effective TZ: | |
415 | * TZ=Europe/Helsinki date -d '2016-12-30 EEST' | |
416 | * | |
417 | * Example 2: | |
418 | * 'EEST' is parsed as 'zone' (TZ=+03:00): | |
419 | * TZ=Asia/Tokyo ./src/date --debug -d '2011-06-11 EEST' | |
420 | * | |
421 | * This is implemented by probing the next three calendar quarters | |
422 | * of the effective timezone and looking for DST changes - | |
423 | * if found, the timezone name (EEST) is inserted into | |
424 | * the lexical lookup table with type tLOCAL_ZONE. | |
425 | * (Search for 'quarter' comment in 'parse_date'). | |
426 | */ | |
427 | local_zone: | |
428 | tLOCAL_ZONE { | |
429 | pc->local_isdst = $1; | |
430 | pc->dsts_seen += (0 < $1); | |
431 | } | |
432 | | tLOCAL_ZONE tDST { | |
433 | pc->local_isdst = 1; | |
434 | pc->dsts_seen += (0 < $1) + 1; | |
435 | } | |
436 | ; | |
437 | ||
438 | /** | |
439 | * Note 'T' is a special case, as it is used as the separator in ISO | |
440 | * 8601 date and time of day representation. | |
441 | */ | |
442 | zone: | |
443 | tZONE { | |
444 | pc->time_zone = $1; | |
445 | } | |
446 | | 'T' { | |
447 | pc->time_zone = HOUR(7); | |
448 | } | |
449 | | tZONE relunit_snumber { | |
450 | pc->time_zone = $1; | |
451 | apply_relative_time (pc, $2, 1); | |
452 | } | |
453 | | 'T' relunit_snumber { | |
454 | pc->time_zone = HOUR(7); | |
455 | apply_relative_time (pc, $2, 1); | |
456 | } | |
457 | | tZONE tSNUMBER o_colon_minutes { | |
480d6bd8 WP |
458 | if (! time_zone_hhmm (pc, $2, $3)) YYABORT; |
459 | pc->time_zone += $1; | |
7088bd88 WP |
460 | } |
461 | | tDAYZONE { | |
462 | pc->time_zone = $1 + 60; | |
463 | } | |
464 | | tZONE tDST { | |
465 | pc->time_zone = $1 + 60; | |
466 | } | |
467 | ; | |
468 | ||
469 | day: | |
470 | tDAY { | |
471 | pc->day_ordinal = 0; | |
472 | pc->day_number = $1; | |
473 | } | |
474 | | tDAY ',' { | |
475 | pc->day_ordinal = 0; | |
476 | pc->day_number = $1; | |
477 | } | |
478 | | tORDINAL tDAY { | |
479 | pc->day_ordinal = $1; | |
480 | pc->day_number = $2; | |
7088bd88 WP |
481 | } |
482 | | tUNUMBER tDAY { | |
483 | pc->day_ordinal = $1.value; | |
484 | pc->day_number = $2; | |
7088bd88 WP |
485 | } |
486 | ; | |
487 | ||
488 | date: | |
489 | tUNUMBER '/' tUNUMBER { | |
490 | pc->month = $1.value; | |
491 | pc->day = $3.value; | |
492 | } | |
493 | | tUNUMBER '/' tUNUMBER '/' tUNUMBER { | |
494 | /** | |
495 | * Interpret as YYYY/MM/DD if the first value has 4 or more digits, | |
496 | * otherwise as MM/DD/YY. | |
497 | * The goal in recognizing YYYY/MM/DD is solely to support legacy | |
498 | * machine-generated dates like those in an RCS log listing. If | |
499 | * you want portability, use the ISO 8601 format. | |
500 | */ | |
501 | if (4 <= $1.digits) { | |
502 | pc->year = $1; | |
503 | pc->month = $3.value; | |
504 | pc->day = $5.value; | |
505 | } else { | |
506 | pc->month = $1.value; | |
507 | pc->day = $3.value; | |
508 | pc->year = $5; | |
509 | } | |
510 | } | |
511 | | tUNUMBER tMONTH tSNUMBER { | |
512 | /* e.g. 17-JUN-1992. */ | |
513 | pc->day = $1.value; | |
514 | pc->month = $2; | |
515 | pc->year.value = -$3.value; | |
516 | pc->year.digits = $3.digits; | |
517 | } | |
518 | | tMONTH tSNUMBER tSNUMBER { | |
519 | /* e.g. JUN-17-1992. */ | |
520 | pc->month = $1; | |
521 | pc->day = -$2.value; | |
522 | pc->year.value = -$3.value; | |
523 | pc->year.digits = $3.digits; | |
524 | } | |
525 | | tMONTH tUNUMBER { | |
526 | pc->month = $1; | |
527 | pc->day = $2.value; | |
528 | } | |
529 | | tMONTH tUNUMBER ',' tUNUMBER { | |
530 | pc->month = $1; | |
531 | pc->day = $2.value; | |
532 | pc->year = $4; | |
533 | } | |
534 | | tUNUMBER tMONTH { | |
535 | pc->day = $1.value; | |
536 | pc->month = $2; | |
537 | } | |
538 | | tUNUMBER tMONTH tUNUMBER { | |
539 | pc->day = $1.value; | |
540 | pc->month = $2; | |
541 | pc->year = $3; | |
542 | } | |
543 | | iso_8601_date | |
544 | ; | |
545 | ||
546 | iso_8601_date: | |
547 | tUNUMBER tSNUMBER tSNUMBER { | |
548 | /* ISO 8601 format.YYYY-MM-DD. */ | |
549 | pc->year = $1; | |
550 | pc->month = -$2.value; | |
551 | pc->day = -$3.value; | |
552 | } | |
553 | ; | |
554 | ||
555 | rel: | |
556 | relunit tAGO | |
557 | { apply_relative_time (pc, $1, $2); } | |
558 | | relunit | |
559 | { apply_relative_time (pc, $1, 1); } | |
560 | | dayshift | |
561 | { apply_relative_time (pc, $1, 1); } | |
562 | ; | |
563 | ||
564 | relunit: | |
565 | tORDINAL tYEAR_UNIT | |
566 | { $$ = RELATIVE_TIME_0; $$.year = $1; } | |
567 | | tUNUMBER tYEAR_UNIT | |
568 | { $$ = RELATIVE_TIME_0; $$.year = $1.value; } | |
569 | | tYEAR_UNIT | |
570 | { $$ = RELATIVE_TIME_0; $$.year = 1; } | |
571 | | tORDINAL tMONTH_UNIT | |
572 | { $$ = RELATIVE_TIME_0; $$.month = $1; } | |
573 | | tUNUMBER tMONTH_UNIT | |
574 | { $$ = RELATIVE_TIME_0; $$.month = $1.value; } | |
575 | | tMONTH_UNIT | |
576 | { $$ = RELATIVE_TIME_0; $$.month = 1; } | |
577 | | tORDINAL tDAY_UNIT | |
578 | { $$ = RELATIVE_TIME_0; $$.day = $1 * $2; } | |
579 | | tUNUMBER tDAY_UNIT | |
580 | { $$ = RELATIVE_TIME_0; $$.day = $1.value * $2; } | |
581 | | tDAY_UNIT | |
582 | { $$ = RELATIVE_TIME_0; $$.day = $1; } | |
583 | | tORDINAL tHOUR_UNIT | |
584 | { $$ = RELATIVE_TIME_0; $$.hour = $1; } | |
585 | | tUNUMBER tHOUR_UNIT | |
586 | { $$ = RELATIVE_TIME_0; $$.hour = $1.value; } | |
587 | | tHOUR_UNIT | |
588 | { $$ = RELATIVE_TIME_0; $$.hour = 1; } | |
589 | | tORDINAL tMINUTE_UNIT | |
590 | { $$ = RELATIVE_TIME_0; $$.minutes = $1; } | |
591 | | tUNUMBER tMINUTE_UNIT | |
592 | { $$ = RELATIVE_TIME_0; $$.minutes = $1.value; } | |
593 | | tMINUTE_UNIT | |
594 | { $$ = RELATIVE_TIME_0; $$.minutes = 1; } | |
595 | | tORDINAL tSEC_UNIT | |
596 | { $$ = RELATIVE_TIME_0; $$.seconds = $1; } | |
597 | | tUNUMBER tSEC_UNIT | |
598 | { $$ = RELATIVE_TIME_0; $$.seconds = $1.value; } | |
599 | | tSDECIMAL_NUMBER tSEC_UNIT { | |
600 | $$ = RELATIVE_TIME_0; | |
601 | $$.seconds = $1.tv_sec; | |
602 | $$.ns = $1.tv_nsec; | |
603 | } | |
604 | | tUDECIMAL_NUMBER tSEC_UNIT { | |
605 | $$ = RELATIVE_TIME_0; | |
606 | $$.seconds = $1.tv_sec; | |
607 | $$.ns = $1.tv_nsec; | |
608 | } | |
609 | | tSEC_UNIT | |
610 | { $$ = RELATIVE_TIME_0; $$.seconds = 1; } | |
611 | | relunit_snumber | |
612 | ; | |
613 | ||
614 | relunit_snumber: | |
615 | tSNUMBER tYEAR_UNIT | |
616 | { $$ = RELATIVE_TIME_0; $$.year = $1.value; } | |
617 | | tSNUMBER tMONTH_UNIT | |
618 | { $$ = RELATIVE_TIME_0; $$.month = $1.value; } | |
619 | | tSNUMBER tDAY_UNIT | |
620 | { $$ = RELATIVE_TIME_0; $$.day = $1.value * $2; } | |
621 | | tSNUMBER tHOUR_UNIT | |
622 | { $$ = RELATIVE_TIME_0; $$.hour = $1.value; } | |
623 | | tSNUMBER tMINUTE_UNIT | |
624 | { $$ = RELATIVE_TIME_0; $$.minutes = $1.value; } | |
625 | | tSNUMBER tSEC_UNIT | |
626 | { $$ = RELATIVE_TIME_0; $$.seconds = $1.value; } | |
627 | ; | |
628 | ||
629 | dayshift: | |
630 | tDAY_SHIFT | |
631 | { $$ = RELATIVE_TIME_0; $$.day = $1; } | |
632 | ; | |
633 | ||
634 | seconds: signed_seconds | unsigned_seconds; | |
635 | ||
636 | signed_seconds: | |
637 | tSDECIMAL_NUMBER | |
638 | | tSNUMBER | |
639 | { $$.tv_sec = $1.value; $$.tv_nsec = 0; } | |
640 | ; | |
641 | ||
642 | unsigned_seconds: | |
643 | tUDECIMAL_NUMBER | |
644 | | tUNUMBER | |
645 | { $$.tv_sec = $1.value; $$.tv_nsec = 0; } | |
646 | ; | |
647 | ||
648 | number: | |
649 | tUNUMBER | |
650 | { digits_to_date_time (pc, $1); } | |
651 | ; | |
652 | ||
653 | hybrid: | |
654 | tUNUMBER relunit_snumber { | |
655 | /** | |
656 | * Hybrid all-digit and relative offset, so that we accept e.g., | |
657 | * "YYYYMMDD +N days" as well as "YYYYMMDD N days". | |
658 | */ | |
659 | digits_to_date_time (pc, $1); | |
660 | apply_relative_time (pc, $2, 1); | |
661 | } | |
662 | ; | |
663 | ||
664 | o_colon_minutes: | |
665 | /* empty */ | |
480d6bd8 WP |
666 | { $$.value = $$.digits = 0; } |
667 | | ':' tUNUMBER { | |
668 | $$ = $2; | |
669 | } | |
7088bd88 WP |
670 | ; |
671 | ||
672 | %% | |
673 | ||
674 | static table const meridian_table[] = { | |
675 | { "AM", tMERIDIAN, MERam }, | |
676 | { "A.M.", tMERIDIAN, MERam }, | |
677 | { "PM", tMERIDIAN, MERpm }, | |
678 | { "P.M.", tMERIDIAN, MERpm }, | |
679 | { NULL, 0, 0 } | |
680 | }; | |
681 | ||
682 | static table const dst_table[] = { | |
683 | { "DST", tDST, 0 } | |
684 | }; | |
685 | ||
686 | static table const month_and_day_table[] = { | |
687 | { "JANUARY", tMONTH, 1 }, | |
688 | { "FEBRUARY", tMONTH, 2 }, | |
689 | { "MARCH", tMONTH, 3 }, | |
690 | { "APRIL", tMONTH, 4 }, | |
691 | { "MAY", tMONTH, 5 }, | |
692 | { "JUNE", tMONTH, 6 }, | |
693 | { "JULY", tMONTH, 7 }, | |
694 | { "AUGUST", tMONTH, 8 }, | |
695 | { "SEPTEMBER",tMONTH, 9 }, | |
696 | { "SEPT", tMONTH, 9 }, | |
697 | { "OCTOBER", tMONTH, 10 }, | |
698 | { "NOVEMBER", tMONTH, 11 }, | |
699 | { "DECEMBER", tMONTH, 12 }, | |
700 | { "SUNDAY", tDAY, 0 }, | |
701 | { "MONDAY", tDAY, 1 }, | |
702 | { "TUESDAY", tDAY, 2 }, | |
703 | { "TUES", tDAY, 2 }, | |
704 | { "WEDNESDAY",tDAY, 3 }, | |
705 | { "WEDNES", tDAY, 3 }, | |
706 | { "THURSDAY", tDAY, 4 }, | |
707 | { "THUR", tDAY, 4 }, | |
708 | { "THURS", tDAY, 4 }, | |
709 | { "FRIDAY", tDAY, 5 }, | |
710 | { "SATURDAY", tDAY, 6 }, | |
711 | { NULL, 0, 0 } | |
712 | }; | |
713 | ||
714 | static table const time_units_table[] = { | |
715 | { "YEAR", tYEAR_UNIT, 1 }, | |
716 | { "MONTH", tMONTH_UNIT, 1 }, | |
717 | { "FORTNIGHT",tDAY_UNIT, 14 }, | |
718 | { "WEEK", tDAY_UNIT, 7 }, | |
719 | { "DAY", tDAY_UNIT, 1 }, | |
720 | { "HOUR", tHOUR_UNIT, 1 }, | |
721 | { "MINUTE", tMINUTE_UNIT, 1 }, | |
722 | { "MIN", tMINUTE_UNIT, 1 }, | |
723 | { "SECOND", tSEC_UNIT, 1 }, | |
724 | { "SEC", tSEC_UNIT, 1 }, | |
725 | { NULL, 0, 0 } | |
726 | }; | |
727 | ||
728 | /* Assorted relative-time words. */ | |
729 | static table const relative_time_table[] = { | |
730 | { "TOMORROW", tDAY_SHIFT, 1 }, | |
731 | { "YESTERDAY",tDAY_SHIFT, -1 }, | |
732 | { "TODAY", tDAY_SHIFT, 0 }, | |
733 | { "NOW", tDAY_SHIFT, 0 }, | |
734 | { "LAST", tORDINAL, -1 }, | |
735 | { "THIS", tORDINAL, 0 }, | |
736 | { "NEXT", tORDINAL, 1 }, | |
737 | { "FIRST", tORDINAL, 1 }, | |
738 | /*{ "SECOND", tORDINAL, 2 }, */ | |
739 | { "THIRD", tORDINAL, 3 }, | |
740 | { "FOURTH", tORDINAL, 4 }, | |
741 | { "FIFTH", tORDINAL, 5 }, | |
742 | { "SIXTH", tORDINAL, 6 }, | |
743 | { "SEVENTH", tORDINAL, 7 }, | |
744 | { "EIGHTH", tORDINAL, 8 }, | |
745 | { "NINTH", tORDINAL, 9 }, | |
746 | { "TENTH", tORDINAL, 10 }, | |
747 | { "ELEVENTH", tORDINAL, 11 }, | |
748 | { "TWELFTH", tORDINAL, 12 }, | |
749 | { "AGO", tAGO, -1 }, | |
750 | { "HENCE", tAGO, 1 }, | |
751 | { NULL, 0, 0 } | |
752 | }; | |
753 | ||
754 | /** | |
755 | * The universal time zone table. These labels can be used even for | |
756 | * timestamps that would not otherwise be valid, e.g., GMT timestamps | |
757 | * in London during summer. | |
758 | */ | |
759 | static table const universal_time_zone_table[] = { | |
760 | { "GMT", tZONE, HOUR ( 0) }, /* Greenwich Mean */ | |
761 | { "UT", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */ | |
762 | { "UTC", tZONE, HOUR ( 0) }, | |
763 | { NULL, 0, 0 } | |
764 | }; | |
765 | ||
766 | /** | |
767 | * The time zone table. This table is necessarily incomplete, as time | |
768 | * zone abbreviations are ambiguous; e.g. Australians interpret "EST" | |
769 | * as Eastern time in Australia, not as US Eastern Standard Time. | |
770 | * You cannot rely on parse_date to handle arbitrary time zone | |
771 | * abbreviations; use numeric abbreviations like "-0500" instead. | |
772 | */ | |
773 | static table const time_zone_table[] = { | |
774 | { "WET", tZONE, HOUR ( 0) }, /* Western European */ | |
775 | { "WEST", tDAYZONE, HOUR ( 0) }, /* Western European Summer */ | |
776 | { "BST", tDAYZONE, HOUR ( 0) }, /* British Summer */ | |
777 | { "ART", tZONE, -HOUR ( 3) }, /* Argentina */ | |
778 | { "BRT", tZONE, -HOUR ( 3) }, /* Brazil */ | |
779 | { "BRST", tDAYZONE, -HOUR ( 3) }, /* Brazil Summer */ | |
780 | { "NST", tZONE, -(HOUR ( 3) + 30) }, /* Newfoundland Standard */ | |
781 | { "NDT", tDAYZONE,-(HOUR ( 3) + 30) }, /* Newfoundland Daylight */ | |
782 | { "AST", tZONE, -HOUR ( 4) }, /* Atlantic Standard */ | |
783 | { "ADT", tDAYZONE, -HOUR ( 4) }, /* Atlantic Daylight */ | |
784 | { "CLT", tZONE, -HOUR ( 4) }, /* Chile */ | |
785 | { "CLST", tDAYZONE, -HOUR ( 4) }, /* Chile Summer */ | |
786 | { "EST", tZONE, -HOUR ( 5) }, /* Eastern Standard */ | |
787 | { "EDT", tDAYZONE, -HOUR ( 5) }, /* Eastern Daylight */ | |
788 | { "CST", tZONE, -HOUR ( 6) }, /* Central Standard */ | |
789 | { "CDT", tDAYZONE, -HOUR ( 6) }, /* Central Daylight */ | |
790 | { "MST", tZONE, -HOUR ( 7) }, /* Mountain Standard */ | |
791 | { "MDT", tDAYZONE, -HOUR ( 7) }, /* Mountain Daylight */ | |
792 | { "PST", tZONE, -HOUR ( 8) }, /* Pacific Standard */ | |
793 | { "PDT", tDAYZONE, -HOUR ( 8) }, /* Pacific Daylight */ | |
794 | { "AKST", tZONE, -HOUR ( 9) }, /* Alaska Standard */ | |
795 | { "AKDT", tDAYZONE, -HOUR ( 9) }, /* Alaska Daylight */ | |
796 | { "HST", tZONE, -HOUR (10) }, /* Hawaii Standard */ | |
797 | { "HAST", tZONE, -HOUR (10) }, /* Hawaii-Aleutian Standard */ | |
798 | { "HADT", tDAYZONE, -HOUR (10) }, /* Hawaii-Aleutian Daylight */ | |
799 | { "SST", tZONE, -HOUR (12) }, /* Samoa Standard */ | |
800 | { "WAT", tZONE, HOUR ( 1) }, /* West Africa */ | |
801 | { "CET", tZONE, HOUR ( 1) }, /* Central European */ | |
802 | { "CEST", tDAYZONE, HOUR ( 1) }, /* Central European Summer */ | |
803 | { "MET", tZONE, HOUR ( 1) }, /* Middle European */ | |
804 | { "MEZ", tZONE, HOUR ( 1) }, /* Middle European */ | |
805 | { "MEST", tDAYZONE, HOUR ( 1) }, /* Middle European Summer */ | |
806 | { "MESZ", tDAYZONE, HOUR ( 1) }, /* Middle European Summer */ | |
807 | { "EET", tZONE, HOUR ( 2) }, /* Eastern European */ | |
808 | { "EEST", tDAYZONE, HOUR ( 2) }, /* Eastern European Summer */ | |
809 | { "CAT", tZONE, HOUR ( 2) }, /* Central Africa */ | |
810 | { "SAST", tZONE, HOUR ( 2) }, /* South Africa Standard */ | |
811 | { "EAT", tZONE, HOUR ( 3) }, /* East Africa */ | |
812 | { "MSK", tZONE, HOUR ( 3) }, /* Moscow */ | |
813 | { "MSD", tDAYZONE, HOUR ( 3) }, /* Moscow Daylight */ | |
814 | { "IST", tZONE, (HOUR ( 5) + 30) }, /* India Standard */ | |
815 | { "SGT", tZONE, HOUR ( 8) }, /* Singapore */ | |
816 | { "KST", tZONE, HOUR ( 9) }, /* Korea Standard */ | |
817 | { "JST", tZONE, HOUR ( 9) }, /* Japan Standard */ | |
818 | { "GST", tZONE, HOUR (10) }, /* Guam Standard */ | |
819 | { "NZST", tZONE, HOUR (12) }, /* New Zealand Standard */ | |
820 | { "NZDT", tDAYZONE, HOUR (12) }, /* New Zealand Daylight */ | |
821 | { NULL, 0, 0 } | |
822 | }; | |
823 | ||
824 | /** | |
825 | * Military time zone table. | |
826 | * | |
827 | * Note 'T' is a special case, as it is used as the separator in ISO | |
828 | * 8601 date and time of day representation. | |
829 | */ | |
830 | static table const military_table[] = { | |
831 | { "A", tZONE, -HOUR ( 1) }, | |
832 | { "B", tZONE, -HOUR ( 2) }, | |
833 | { "C", tZONE, -HOUR ( 3) }, | |
834 | { "D", tZONE, -HOUR ( 4) }, | |
835 | { "E", tZONE, -HOUR ( 5) }, | |
836 | { "F", tZONE, -HOUR ( 6) }, | |
837 | { "G", tZONE, -HOUR ( 7) }, | |
838 | { "H", tZONE, -HOUR ( 8) }, | |
839 | { "I", tZONE, -HOUR ( 9) }, | |
840 | { "K", tZONE, -HOUR (10) }, | |
841 | { "L", tZONE, -HOUR (11) }, | |
842 | { "M", tZONE, -HOUR (12) }, | |
843 | { "N", tZONE, HOUR ( 1) }, | |
844 | { "O", tZONE, HOUR ( 2) }, | |
845 | { "P", tZONE, HOUR ( 3) }, | |
846 | { "Q", tZONE, HOUR ( 4) }, | |
847 | { "R", tZONE, HOUR ( 5) }, | |
848 | { "S", tZONE, HOUR ( 6) }, | |
849 | { "T", 'T', 0 }, | |
850 | { "U", tZONE, HOUR ( 8) }, | |
851 | { "V", tZONE, HOUR ( 9) }, | |
852 | { "W", tZONE, HOUR (10) }, | |
853 | { "X", tZONE, HOUR (11) }, | |
854 | { "Y", tZONE, HOUR (12) }, | |
855 | { "Z", tZONE, HOUR ( 0) }, | |
856 | { NULL, 0, 0 } | |
857 | }; | |
858 | ||
7088bd88 | 859 | /** |
480d6bd8 WP |
860 | * Convert a time offset expressed as HH:MM or HHMM into an integer count of |
861 | * minutes. If hh is more than 2 digits then it is of the form HHMM and must be | |
862 | * delimited; in that case 'mm' is required to be absent. Otherwise, hh and mm | |
863 | * are used ('mm' contains digits that were prefixed with a colon). | |
864 | * | |
865 | * POSIX TZ and ISO 8601 both define the maximum offset as 24:59. POSIX also | |
866 | * allows seconds, but currently the parser rejects them. Both require minutes | |
867 | * to be zero padded (2 digits). ISO requires hours to be zero padded, POSIX | |
868 | * does not, either is accepted; which means an invalid ISO offset could pass. | |
7088bd88 WP |
869 | */ |
870 | ||
480d6bd8 | 871 | static int time_zone_hhmm(parser_control *pc, textint hh, textint mm) |
7088bd88 | 872 | { |
480d6bd8 WP |
873 | int h, m; |
874 | ||
875 | if (hh.digits > 2 && hh.digits < 5 && mm.digits == 0) { | |
876 | h = hh.value / 100; | |
877 | m = hh.value % 100; | |
878 | } else if (hh.digits < 3 && (mm.digits == 0 || mm.digits == 2)) { | |
879 | h = hh.value; | |
880 | m = hh.negative ? -mm.value : mm.value; | |
881 | } else | |
882 | return 0; | |
883 | ||
884 | if (abs(h) > 24 || abs(m) > 59) | |
885 | return 0; | |
886 | ||
887 | pc->time_zone = h * 60 + m; | |
888 | return 1; | |
7088bd88 WP |
889 | } |
890 | ||
960f98c9 | 891 | static int to_hour(intmax_t hours, int meridian) |
7088bd88 WP |
892 | { |
893 | switch (meridian) { | |
894 | default: /* Pacify GCC. */ | |
895 | case MER24: | |
896 | return 0 <= hours && hours < 24 ? hours : -1; | |
897 | case MERam: | |
898 | return 0 < hours && hours < 12 ? hours : hours == 12 ? 0 : -1; | |
899 | case MERpm: | |
900 | return 0 < hours && hours < 12 ? hours + 12 : hours == 12 ? 12 : -1; | |
901 | } | |
902 | } | |
903 | ||
904 | static long int to_year(textint textyear) | |
905 | { | |
960f98c9 | 906 | intmax_t year = textyear.value; |
7088bd88 WP |
907 | |
908 | if (year < 0) | |
909 | year = -year; | |
910 | ||
911 | /** | |
912 | * XPG4 suggests that years 00-68 map to 2000-2068, and | |
913 | * years 69-99 map to 1969-1999. | |
914 | */ | |
915 | else if (textyear.digits == 2) | |
916 | year += year < 69 ? 2000 : 1900; | |
917 | ||
918 | return year; | |
919 | } | |
920 | ||
921 | static table const * lookup_zone(parser_control const *pc, char const *name) | |
922 | { | |
923 | table const *tp; | |
924 | ||
925 | for (tp = universal_time_zone_table; tp->name; tp++) | |
926 | if (strcmp (name, tp->name) == 0) | |
927 | return tp; | |
928 | ||
929 | /** | |
930 | * Try local zone abbreviations before those in time_zone_table, as | |
931 | * the local ones are more likely to be right. | |
932 | */ | |
933 | for (tp = pc->local_time_zone_table; tp->name; tp++) | |
934 | if (strcmp (name, tp->name) == 0) | |
935 | return tp; | |
936 | ||
937 | for (tp = time_zone_table; tp->name; tp++) | |
938 | if (strcmp (name, tp->name) == 0) | |
939 | return tp; | |
940 | ||
941 | return NULL; | |
942 | } | |
943 | ||
944 | #if ! HAVE_TM_GMTOFF | |
945 | /** | |
946 | * Yield the difference between *A and *B, | |
947 | * measured in seconds, ignoring leap seconds. | |
948 | * The body of this function is taken directly from the GNU C Library; | |
949 | * see src/strftime.c. | |
950 | */ | |
1d6702ed | 951 | static int tm_diff(struct tm const *a, struct tm const *b) |
7088bd88 WP |
952 | { |
953 | /** | |
954 | * Compute intervening leap days correctly even if year is negative. | |
955 | * Take care to avoid int overflow in leap day calculations. | |
956 | */ | |
957 | int a4 = SHR (a->tm_year, 2) + SHR (TM_YEAR_BASE, 2) - ! (a->tm_year & 3); | |
958 | int b4 = SHR (b->tm_year, 2) + SHR (TM_YEAR_BASE, 2) - ! (b->tm_year & 3); | |
959 | int a100 = a4 / 25 - (a4 % 25 < 0); | |
960 | int b100 = b4 / 25 - (b4 % 25 < 0); | |
961 | int a400 = SHR (a100, 2); | |
962 | int b400 = SHR (b100, 2); | |
963 | int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400); | |
1d6702ed | 964 | int years = a->tm_year - b->tm_year; |
75f8be9e | 965 | int days = (365 * years + intervening_leap_days |
7088bd88 WP |
966 | + (a->tm_yday - b->tm_yday)); |
967 | return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) | |
968 | + (a->tm_min - b->tm_min)) | |
969 | + (a->tm_sec - b->tm_sec)); | |
970 | } | |
971 | #endif /* ! HAVE_TM_GMTOFF */ | |
972 | ||
973 | static table const * lookup_word(parser_control const *pc, char *word) | |
974 | { | |
975 | char *p; | |
976 | char *q; | |
977 | size_t wordlen; | |
978 | table const *tp; | |
979 | int period_found; | |
980 | int abbrev; | |
981 | ||
982 | /* Make it uppercase. */ | |
bfbace76 WP |
983 | for (p = word; *p; p++) |
984 | *p = c_toupper (to_uchar (*p)); | |
7088bd88 WP |
985 | |
986 | for (tp = meridian_table; tp->name; tp++) | |
987 | if (strcmp (word, tp->name) == 0) | |
988 | return tp; | |
989 | ||
990 | /* See if we have an abbreviation for a month. */ | |
991 | wordlen = strlen (word); | |
992 | abbrev = wordlen == 3 || (wordlen == 4 && word[3] == '.'); | |
993 | ||
994 | for (tp = month_and_day_table; tp->name; tp++) | |
995 | if ((abbrev ? strncmp (word, tp->name, 3) : | |
996 | strcmp (word, tp->name)) == 0) | |
997 | return tp; | |
998 | ||
999 | if ((tp = lookup_zone (pc, word))) | |
1000 | return tp; | |
1001 | ||
1002 | if (strcmp (word, dst_table[0].name) == 0) | |
1003 | return dst_table; | |
1004 | ||
1005 | for (tp = time_units_table; tp->name; tp++) | |
1006 | if (strcmp (word, tp->name) == 0) | |
1007 | return tp; | |
1008 | ||
1009 | /* Strip off any plural and try the units table again. */ | |
1010 | if (word[wordlen - 1] == 'S') { | |
1011 | word[wordlen - 1] = '\0'; | |
1012 | for (tp = time_units_table; tp->name; tp++) | |
1013 | if (strcmp (word, tp->name) == 0) | |
1014 | return tp; | |
1015 | word[wordlen - 1] = 'S'; /* For "this" in relative_time_table. */ | |
1016 | } | |
1017 | ||
1018 | for (tp = relative_time_table; tp->name; tp++) | |
1019 | if (strcmp (word, tp->name) == 0) | |
1020 | return tp; | |
1021 | ||
1022 | /* Military time zones. */ | |
1023 | if (wordlen == 1) | |
1024 | for (tp = military_table; tp->name; tp++) | |
1025 | if (word[0] == tp->name[0]) | |
1026 | return tp; | |
1027 | ||
1028 | /* Drop out any periods and try the time zone table again. */ | |
1029 | for (period_found = 0, p = q = word; (*p = *q); q++) | |
1030 | if (*q == '.') | |
1031 | period_found = 1; | |
1032 | else | |
1033 | p++; | |
1034 | if (period_found && (tp = lookup_zone (pc, word))) | |
1035 | return tp; | |
1036 | ||
1037 | return NULL; | |
1038 | } | |
1039 | ||
1040 | static int yylex (union YYSTYPE *lvalp, parser_control *pc) | |
1041 | { | |
1042 | unsigned char c; | |
1043 | size_t count; | |
1044 | ||
1045 | for (;;) { | |
1046 | while (c = *pc->input, c_isspace (c)) | |
1047 | pc->input++; | |
1048 | ||
6fc1d48d | 1049 | if (c_isdigit (c) || c == '-' || c == '+') { |
7088bd88 WP |
1050 | char const *p; |
1051 | int sign; | |
07668cd1 | 1052 | uintmax_t value; |
7088bd88 WP |
1053 | if (c == '-' || c == '+') { |
1054 | sign = c == '-' ? -1 : 1; | |
1055 | while (c = *++pc->input, c_isspace (c)) | |
1056 | continue; | |
6fc1d48d | 1057 | if (! c_isdigit (c)) |
7088bd88 WP |
1058 | /* skip the '-' sign */ |
1059 | continue; | |
1060 | } else | |
1061 | sign = 0; | |
1062 | p = pc->input; | |
1063 | for (value = 0; ; value *= 10) { | |
07668cd1 | 1064 | uintmax_t value1 = value + (c - '0'); |
7088bd88 WP |
1065 | if (value1 < value) |
1066 | return '?'; | |
1067 | value = value1; | |
1068 | c = *++p; | |
6fc1d48d | 1069 | if (! c_isdigit (c)) |
7088bd88 | 1070 | break; |
07668cd1 | 1071 | if (UINTMAX_MAX / 10 < value) |
7088bd88 WP |
1072 | return '?'; |
1073 | } | |
6fc1d48d | 1074 | if ((c == '.' || c == ',') && c_isdigit (p[1])) { |
7088bd88 WP |
1075 | time_t s; |
1076 | int ns; | |
1077 | int digits; | |
07668cd1 | 1078 | uintmax_t value1; |
7088bd88 WP |
1079 | |
1080 | /* Check for overflow when converting value to | |
1081 | * time_t. | |
1082 | */ | |
1083 | if (sign < 0) { | |
1084 | s = - value; | |
1085 | if (0 < s) | |
1086 | return '?'; | |
1087 | value1 = -s; | |
1088 | } else { | |
1089 | s = value; | |
1090 | if (s < 0) | |
1091 | return '?'; | |
1092 | value1 = s; | |
1093 | } | |
1094 | if (value != value1) | |
1095 | return '?'; | |
1096 | ||
1097 | /* Accumulate fraction, to ns precision. */ | |
1098 | p++; | |
1099 | ns = *p++ - '0'; | |
1100 | for (digits = 2; | |
1101 | digits <= LOG10_BILLION; digits++) { | |
1102 | ns *= 10; | |
6fc1d48d | 1103 | if (c_isdigit (*p)) |
7088bd88 WP |
1104 | ns += *p++ - '0'; |
1105 | } | |
1106 | ||
1107 | /* Skip excess digits, truncating toward | |
1108 | * -Infinity. | |
1109 | */ | |
1110 | if (sign < 0) | |
6fc1d48d | 1111 | for (; c_isdigit (*p); p++) |
7088bd88 WP |
1112 | if (*p != '0') { |
1113 | ns++; | |
1114 | break; | |
1115 | } | |
6fc1d48d | 1116 | while (c_isdigit (*p)) |
7088bd88 WP |
1117 | p++; |
1118 | ||
1119 | /* Adjust to the timespec convention, which is | |
1120 | * that tv_nsec is always a positive offset even | |
1121 | * if tv_sec is negative. | |
1122 | */ | |
1123 | if (sign < 0 && ns) { | |
1124 | s--; | |
1125 | if (! (s < 0)) | |
1126 | return '?'; | |
1127 | ns = BILLION - ns; | |
1128 | } | |
1129 | ||
1130 | lvalp->timespec.tv_sec = s; | |
1131 | lvalp->timespec.tv_nsec = ns; | |
1132 | pc->input = p; | |
1133 | return | |
1134 | sign ? tSDECIMAL_NUMBER : tUDECIMAL_NUMBER; | |
1135 | } else { | |
1136 | lvalp->textintval.negative = sign < 0; | |
1137 | if (sign < 0) { | |
1138 | lvalp->textintval.value = - value; | |
1139 | if (0 < lvalp->textintval.value) | |
1140 | return '?'; | |
1141 | } else { | |
1142 | lvalp->textintval.value = value; | |
1143 | if (lvalp->textintval.value < 0) | |
1144 | return '?'; | |
1145 | } | |
1146 | lvalp->textintval.digits = p - pc->input; | |
1147 | pc->input = p; | |
1148 | return sign ? tSNUMBER : tUNUMBER; | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | if (c_isalpha (c)) { | |
1153 | char buff[20]; | |
1154 | char *p = buff; | |
1155 | table const *tp; | |
1156 | ||
1157 | do { | |
1158 | if (p < buff + sizeof buff - 1) | |
1159 | *p++ = c; | |
1160 | c = *++pc->input; | |
1161 | } | |
1162 | while (c_isalpha (c) || c == '.'); | |
1163 | ||
1164 | *p = '\0'; | |
1165 | tp = lookup_word (pc, buff); | |
1166 | if (! tp) { | |
1167 | return '?'; | |
1168 | } | |
1169 | lvalp->intval = tp->value; | |
1170 | return tp->type; | |
1171 | } | |
1172 | ||
1173 | if (c != '(') | |
1174 | return to_uchar (*pc->input++); | |
1175 | ||
1176 | count = 0; | |
1177 | do { | |
1178 | c = *pc->input++; | |
1179 | if (c == '\0') | |
1180 | return c; | |
1181 | if (c == '(') | |
1182 | count++; | |
1183 | else if (c == ')') | |
1184 | count--; | |
1185 | } | |
1186 | while (count != 0); | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | /* Do nothing if the parser reports an error. */ | |
1191 | static int yyerror(parser_control const *pc __attribute__((__unused__)), | |
1192 | char const *s __attribute__((__unused__))) | |
1193 | { | |
1194 | return 0; | |
1195 | } | |
1196 | ||
1197 | /** | |
1198 | * If *TM0 is the old and *TM1 is the new value of a struct tm after | |
1199 | * passing it to mktime, return 1 if it's OK that mktime returned T. | |
1200 | * It's not OK if *TM0 has out-of-range members. | |
1201 | */ | |
1202 | ||
1203 | static int mktime_ok(struct tm const *tm0, struct tm const *tm1, time_t t) | |
1204 | { | |
1205 | if (t == (time_t) -1) { | |
1206 | /** | |
1207 | * Guard against falsely reporting an error when parsing a | |
1208 | * timestamp that happens to equal (time_t) -1, on a host that | |
1209 | * supports such a timestamp. | |
1210 | */ | |
1211 | tm1 = localtime (&t); | |
1212 | if (!tm1) | |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | return ! ((tm0->tm_sec ^ tm1->tm_sec) | |
1217 | | (tm0->tm_min ^ tm1->tm_min) | |
1218 | | (tm0->tm_hour ^ tm1->tm_hour) | |
1219 | | (tm0->tm_mday ^ tm1->tm_mday) | |
1220 | | (tm0->tm_mon ^ tm1->tm_mon) | |
1221 | | (tm0->tm_year ^ tm1->tm_year)); | |
1222 | } | |
1223 | ||
1224 | /** | |
1225 | * A reasonable upper bound for the size of ordinary TZ strings. | |
1226 | * Use heap allocation if TZ's length exceeds this. | |
1227 | */ | |
1228 | enum { TZBUFSIZE = 100 }; | |
1229 | ||
1230 | /** | |
1231 | * Return a copy of TZ, stored in TZBUF if it fits, and heap-allocated | |
1232 | * otherwise. | |
1233 | */ | |
1234 | static char * get_tz(char tzbuf[TZBUFSIZE]) | |
1235 | { | |
1236 | char *tz = getenv ("TZ"); | |
1237 | if (tz) { | |
1238 | size_t tzsize = strlen (tz) + 1; | |
1239 | tz = (tzsize <= TZBUFSIZE | |
1240 | ? memcpy (tzbuf, tz, tzsize) | |
22cfe662 | 1241 | : strdup (tz)); |
7088bd88 WP |
1242 | } |
1243 | return tz; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * Parse a date/time string, storing the resulting time value into *result. | |
1248 | * The string itself is pointed to by *p. Return 1 if successful. | |
1249 | * *p can be an incomplete or relative time specification; if so, use | |
1250 | * *now as the basis for the returned time. | |
1251 | */ | |
1252 | int parse_date(struct timespec *result, char const *p, | |
1253 | struct timespec const *now) | |
1254 | { | |
1255 | time_t Start; | |
960f98c9 | 1256 | intmax_t Start_ns; |
7088bd88 WP |
1257 | struct tm const *tmp; |
1258 | struct tm tm; | |
1259 | struct tm tm0; | |
1260 | parser_control pc; | |
1261 | struct timespec gettime_buffer; | |
1262 | unsigned char c; | |
1263 | int tz_was_altered = 0; | |
1264 | char *tz0 = NULL; | |
1265 | char tz0buf[TZBUFSIZE]; | |
1266 | int ok = 1; | |
1267 | struct timeval tv; | |
1268 | ||
1269 | if (! now) { | |
1270 | gettimeofday (&tv, NULL); | |
1271 | gettime_buffer.tv_sec = tv.tv_sec; | |
1272 | gettime_buffer.tv_nsec = tv.tv_usec * 1000; | |
1273 | now = &gettime_buffer; | |
1274 | } | |
1275 | ||
1276 | Start = now->tv_sec; | |
1277 | Start_ns = now->tv_nsec; | |
1278 | ||
1279 | tmp = localtime (&now->tv_sec); | |
1280 | if (! tmp) | |
1281 | return 0; | |
1282 | ||
1283 | while (c = *p, c_isspace (c)) | |
1284 | p++; | |
1285 | ||
1286 | if (strncmp (p, "TZ=\"", 4) == 0) { | |
1287 | char const *tzbase = p + 4; | |
1288 | size_t tzsize = 1; | |
1289 | char const *s; | |
1290 | ||
1291 | for (s = tzbase; *s; s++, tzsize++) | |
1292 | if (*s == '\\') { | |
1293 | s++; | |
1294 | if (! (*s == '\\' || *s == '"')) | |
1295 | break; | |
1296 | } else if (*s == '"') { | |
1297 | char *z; | |
1298 | char *tz1; | |
1299 | char tz1buf[TZBUFSIZE]; | |
1300 | int large_tz = TZBUFSIZE < tzsize; | |
1301 | int setenv_ok; | |
22cfe662 | 1302 | |
7088bd88 | 1303 | tz0 = get_tz (tz0buf); |
22cfe662 KZ |
1304 | if (!tz0) |
1305 | goto fail; | |
1306 | ||
1307 | if (large_tz) { | |
1308 | z = tz1 = malloc (tzsize); | |
1309 | if (!tz1) | |
1310 | goto fail; | |
1311 | } else | |
1312 | z = tz1 = tz1buf; | |
1313 | ||
7088bd88 WP |
1314 | for (s = tzbase; *s != '"'; s++) |
1315 | *z++ = *(s += *s == '\\'); | |
1316 | *z = '\0'; | |
1317 | setenv_ok = setenv ("TZ", tz1, 1) == 0; | |
1318 | if (large_tz) | |
1319 | free (tz1); | |
1320 | if (!setenv_ok) | |
1321 | goto fail; | |
1322 | tz_was_altered = 1; | |
1323 | ||
1324 | p = s + 1; | |
1325 | while (c = *p, c_isspace (c)) | |
1326 | p++; | |
1327 | ||
1328 | break; | |
1329 | } | |
1330 | } | |
1331 | ||
1332 | /** | |
1333 | * As documented, be careful to treat the empty string just like | |
1334 | * a date string of "0". Without this, an empty string would be | |
1335 | * declared invalid when parsed during a DST transition. | |
1336 | */ | |
1337 | if (*p == '\0') | |
1338 | p = "0"; | |
1339 | ||
1340 | pc.input = p; | |
1341 | pc.year.value = tmp->tm_year; | |
1342 | pc.year.value += TM_YEAR_BASE; | |
1343 | pc.year.digits = 0; | |
1344 | pc.month = tmp->tm_mon + 1; | |
1345 | pc.day = tmp->tm_mday; | |
1346 | pc.hour = tmp->tm_hour; | |
1347 | pc.minutes = tmp->tm_min; | |
1348 | pc.seconds.tv_sec = tmp->tm_sec; | |
1349 | pc.seconds.tv_nsec = Start_ns; | |
1350 | tm.tm_isdst = tmp->tm_isdst; | |
1351 | ||
1352 | pc.meridian = MER24; | |
1353 | pc.rel = RELATIVE_TIME_0; | |
1354 | pc.timespec_seen = 0; | |
1355 | pc.rels_seen = 0; | |
1356 | pc.dates_seen = 0; | |
1357 | pc.days_seen = 0; | |
1358 | pc.times_seen = 0; | |
1359 | pc.local_zones_seen = 0; | |
1360 | pc.dsts_seen = 0; | |
1361 | pc.zones_seen = 0; | |
7088bd88 WP |
1362 | |
1363 | #if HAVE_STRUCT_TM_TM_ZONE | |
1364 | pc.local_time_zone_table[0].name = tmp->tm_zone; | |
1365 | pc.local_time_zone_table[0].type = tLOCAL_ZONE; | |
1366 | pc.local_time_zone_table[0].value = tmp->tm_isdst; | |
1367 | pc.local_time_zone_table[1].name = NULL; | |
1368 | ||
1369 | /** | |
1370 | * Probe the names used in the next three calendar quarters, looking | |
1371 | * for a tm_isdst different from the one we already have. | |
1372 | */ | |
1373 | { | |
1374 | int quarter; | |
1375 | for (quarter = 1; quarter <= 3; quarter++) { | |
1376 | time_t probe = Start + quarter * (90 * 24 * 60 * 60); | |
1377 | struct tm const *probe_tm = localtime (&probe); | |
1378 | if (probe_tm && probe_tm->tm_zone | |
1379 | && probe_tm->tm_isdst | |
1380 | != pc.local_time_zone_table[0].value) { | |
1381 | { | |
1382 | pc.local_time_zone_table[1].name | |
1383 | = probe_tm->tm_zone; | |
1384 | pc.local_time_zone_table[1].type | |
1385 | = tLOCAL_ZONE; | |
1386 | pc.local_time_zone_table[1].value | |
1387 | = probe_tm->tm_isdst; | |
1388 | pc.local_time_zone_table[2].name | |
1389 | = NULL; | |
1390 | } | |
1391 | break; | |
1392 | } | |
1393 | } | |
1394 | } | |
1395 | #else | |
1396 | #if HAVE_TZNAME | |
1397 | { | |
1398 | # if !HAVE_DECL_TZNAME | |
1399 | extern char *tzname[]; | |
1400 | # endif | |
1401 | int i; | |
1402 | for (i = 0; i < 2; i++) { | |
1403 | pc.local_time_zone_table[i].name = tzname[i]; | |
1404 | pc.local_time_zone_table[i].type = tLOCAL_ZONE; | |
1405 | pc.local_time_zone_table[i].value = i; | |
1406 | } | |
1407 | pc.local_time_zone_table[i].name = NULL; | |
1408 | } | |
1409 | #else | |
1410 | pc.local_time_zone_table[0].name = NULL; | |
1411 | #endif | |
1412 | #endif | |
1413 | ||
1414 | if (pc.local_time_zone_table[0].name && pc.local_time_zone_table[1].name | |
1415 | && ! strcmp (pc.local_time_zone_table[0].name, | |
1416 | pc.local_time_zone_table[1].name)) { | |
1417 | /** | |
1418 | * This locale uses the same abbreviation for standard and | |
1419 | * daylight times. So if we see that abbreviation, we don't | |
1420 | * know whether it's daylight time. | |
1421 | */ | |
1422 | pc.local_time_zone_table[0].value = -1; | |
1423 | pc.local_time_zone_table[1].name = NULL; | |
1424 | } | |
1425 | ||
1426 | if (yyparse (&pc) != 0) { | |
1427 | goto fail; | |
1428 | } | |
1429 | ||
1430 | if (pc.timespec_seen) | |
1431 | *result = pc.seconds; | |
1432 | else { | |
1433 | if (1 < (pc.times_seen | pc.dates_seen | pc.days_seen | |
1434 | | pc.dsts_seen | |
1435 | | (pc.local_zones_seen + pc.zones_seen))) { | |
1436 | goto fail; | |
1437 | } | |
1438 | ||
1439 | tm.tm_year = to_year (pc.year) - TM_YEAR_BASE; | |
1440 | tm.tm_mon = pc.month - 1; | |
1441 | tm.tm_mday = pc.day; | |
1442 | if (pc.times_seen || (pc.rels_seen && | |
1443 | ! pc.dates_seen && ! pc.days_seen)) { | |
1444 | tm.tm_hour = to_hour (pc.hour, pc.meridian); | |
1445 | if (tm.tm_hour < 0) { | |
1446 | goto fail; | |
1447 | } | |
1448 | tm.tm_min = pc.minutes; | |
1449 | tm.tm_sec = pc.seconds.tv_sec; | |
1450 | } else { | |
1451 | tm.tm_hour = tm.tm_min = tm.tm_sec = 0; | |
1452 | pc.seconds.tv_nsec = 0; | |
1453 | } | |
1454 | ||
1455 | /** | |
1456 | * Let mktime deduce tm_isdst if we have an absolute timestamp. | |
1457 | */ | |
1458 | if (pc.dates_seen | pc.days_seen | pc.times_seen) | |
1459 | tm.tm_isdst = -1; | |
1460 | ||
1461 | /** | |
1462 | * But if the input explicitly specifies local time with or | |
1463 | * without DST, give mktime that information. | |
1464 | */ | |
1465 | if (pc.local_zones_seen) | |
1466 | tm.tm_isdst = pc.local_isdst; | |
1467 | ||
1468 | tm0 = tm; | |
1469 | ||
1470 | Start = mktime (&tm); | |
1471 | ||
1472 | if (! mktime_ok (&tm0, &tm, Start)) { | |
1473 | if (! pc.zones_seen) { | |
1474 | goto fail; | |
1475 | } else { | |
1476 | /** Guard against falsely reporting errors near | |
1477 | * the time_t boundaries when parsing times in | |
1478 | * other time zones. For example, suppose the | |
1479 | * input string "1969-12-31 23:00:00 -0100", the | |
1480 | * current time zone is 8 hours ahead of UTC, | |
1481 | * and the min time_t value is 1970-01-01 | |
1482 | * 00:00:00 UTC. Then the min localtime value | |
1483 | * is 1970-01-01 08:00:00, and mktime will | |
1484 | * therefore fail on 1969-12-31 23:00:00. To | |
1485 | * work around the problem, set the time zone to | |
1486 | * 1 hour behind UTC temporarily by setting | |
1487 | * TZ="XXX1:00" and try mktime again. | |
1488 | */ | |
1489 | ||
960f98c9 | 1490 | intmax_t time_zone = pc.time_zone; |
7088bd88 | 1491 | |
960f98c9 | 1492 | intmax_t abs_time_zone = time_zone < 0 |
7088bd88 WP |
1493 | ? - time_zone : time_zone; |
1494 | ||
960f98c9 | 1495 | intmax_t abs_time_zone_hour |
7088bd88 WP |
1496 | = abs_time_zone / 60; |
1497 | ||
1498 | int abs_time_zone_min = abs_time_zone % 60; | |
1499 | ||
1500 | char tz1buf[sizeof "XXX+0:00" | |
1501 | + sizeof pc.time_zone | |
1502 | * CHAR_BIT / 3]; | |
1503 | ||
1504 | if (!tz_was_altered) | |
1505 | tz0 = get_tz (tz0buf); | |
fc77d25f | 1506 | sprintf (tz1buf, "XXX%s%jd:%02d", |
7088bd88 WP |
1507 | &"-"[time_zone < 0], |
1508 | abs_time_zone_hour, | |
1509 | abs_time_zone_min); | |
1510 | if (setenv ("TZ", tz1buf, 1) != 0) { | |
1511 | goto fail; | |
1512 | } | |
1513 | tz_was_altered = 1; | |
1514 | tm = tm0; | |
1515 | Start = mktime (&tm); | |
1516 | if (! mktime_ok (&tm0, &tm, Start)) { | |
1517 | goto fail; | |
1518 | } | |
1519 | } | |
1520 | } | |
1521 | ||
1522 | if (pc.days_seen && ! pc.dates_seen) { | |
1523 | tm.tm_mday += ((pc.day_number - tm.tm_wday + 7) % 7 + 7 | |
1524 | * (pc.day_ordinal | |
1525 | - (0 < pc.day_ordinal | |
1526 | && tm.tm_wday != pc.day_number))); | |
1527 | tm.tm_isdst = -1; | |
1528 | Start = mktime (&tm); | |
1529 | if (Start == (time_t) -1) { | |
1530 | goto fail; | |
1531 | } | |
1532 | } | |
1533 | /* Add relative date. */ | |
1534 | if (pc.rel.year | pc.rel.month | pc.rel.day) { | |
1535 | int year = tm.tm_year + pc.rel.year; | |
1536 | int month = tm.tm_mon + pc.rel.month; | |
1537 | int day = tm.tm_mday + pc.rel.day; | |
1538 | if (((year < tm.tm_year) ^ (pc.rel.year < 0)) | |
1539 | | ((month < tm.tm_mon) ^ (pc.rel.month < 0)) | |
1540 | | ((day < tm.tm_mday) ^ (pc.rel.day < 0))) { | |
1541 | goto fail; | |
1542 | } | |
1543 | tm.tm_year = year; | |
1544 | tm.tm_mon = month; | |
1545 | tm.tm_mday = day; | |
1546 | tm.tm_hour = tm0.tm_hour; | |
1547 | tm.tm_min = tm0.tm_min; | |
1548 | tm.tm_sec = tm0.tm_sec; | |
1549 | tm.tm_isdst = tm0.tm_isdst; | |
1550 | Start = mktime (&tm); | |
1551 | if (Start == (time_t) -1) { | |
1552 | goto fail; | |
1553 | } | |
1554 | } | |
1555 | ||
1556 | /** | |
1557 | * The only "output" of this if-block is an updated Start value, | |
1558 | * so this block must follow others that clobber Start. | |
1559 | */ | |
1560 | if (pc.zones_seen) { | |
960f98c9 | 1561 | intmax_t delta = pc.time_zone * 60; |
7088bd88 WP |
1562 | time_t t1; |
1563 | #ifdef HAVE_TM_GMTOFF | |
1564 | delta -= tm.tm_gmtoff; | |
1565 | #else | |
1566 | time_t t = Start; | |
1567 | struct tm const *gmt = gmtime (&t); | |
1568 | if (! gmt) { | |
1569 | goto fail; | |
1570 | } | |
1571 | delta -= tm_diff (&tm, gmt); | |
1572 | #endif | |
1573 | t1 = Start - delta; | |
1574 | if ((Start < t1) != (delta < 0)) { | |
1575 | goto fail; /* time_t overflow */ | |
1576 | } | |
1577 | Start = t1; | |
1578 | } | |
1579 | ||
1580 | /** | |
1581 | * Add relative hours, minutes, and seconds. On hosts that | |
1582 | * support leap seconds, ignore the possibility of leap seconds; | |
1583 | * e.g., "+ 10 minutes" adds 600 seconds, even if one of them is | |
1584 | * a leap second. Typically this is not what the user wants, | |
1585 | * but it's too hard to do it the other way, because the time | |
1586 | * zone indicator must be applied before relative times, and if | |
1587 | * mktime is applied again the time zone will be lost. | |
1588 | */ | |
960f98c9 WP |
1589 | intmax_t sum_ns = pc.seconds.tv_nsec + pc.rel.ns; |
1590 | intmax_t normalized_ns = (sum_ns % BILLION + BILLION) % BILLION; | |
7088bd88 | 1591 | time_t t0 = Start; |
960f98c9 | 1592 | intmax_t d1 = 60 * 60 * pc.rel.hour; |
7088bd88 | 1593 | time_t t1 = t0 + d1; |
960f98c9 | 1594 | intmax_t d2 = 60 * pc.rel.minutes; |
7088bd88 WP |
1595 | time_t t2 = t1 + d2; |
1596 | time_t d3 = pc.rel.seconds; | |
1597 | time_t t3 = t2 + d3; | |
960f98c9 | 1598 | intmax_t d4 = (sum_ns - normalized_ns) / BILLION; |
7088bd88 WP |
1599 | time_t t4 = t3 + d4; |
1600 | time_t t5 = t4; | |
1601 | ||
1602 | if ((d1 / (60 * 60) ^ pc.rel.hour) | |
1603 | | (d2 / 60 ^ pc.rel.minutes) | |
1604 | | ((t1 < t0) ^ (d1 < 0)) | |
1605 | | ((t2 < t1) ^ (d2 < 0)) | |
1606 | | ((t3 < t2) ^ (d3 < 0)) | |
1607 | | ((t4 < t3) ^ (d4 < 0)) | |
1608 | | (t5 != t4)) { | |
1609 | goto fail; | |
1610 | } | |
1611 | result->tv_sec = t5; | |
1612 | result->tv_nsec = normalized_ns; | |
1613 | } | |
1614 | ||
1615 | goto done; | |
1616 | ||
1617 | fail: | |
1618 | ok = 0; | |
1619 | done: | |
1620 | if (tz_was_altered) | |
1621 | ok &= (tz0 ? setenv ("TZ", tz0, 1) | |
1622 | : unsetenv ("TZ")) == 0; | |
1623 | if (tz0 != tz0buf) | |
1624 | free (tz0); | |
1625 | return ok; | |
1626 | } |