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git-log.txt: order OPTIONS properly; move <since>..<until>
[git/gitweb.git] / date.c
blob57331ed406e2391e0a2bf327fbb86d3b62012324
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6
7 #include "cache.h"
8
9 /*
10 * This is like mktime, but without normalization of tm_wday and tm_yday.
11 */
12 static time_t tm_to_time_t(const struct tm *tm)
13 {
14 static const int mdays[] = {
15 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
16 };
17 int year = tm->tm_year - 70;
18 int month = tm->tm_mon;
19 int day = tm->tm_mday;
20
21 if (year < 0 || year > 129) /* algo only works for 1970-2099 */
22 return -1;
23 if (month < 0 || month > 11) /* array bounds */
24 return -1;
25 if (month < 2 || (year + 2) % 4)
26 day--;
27 if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0)
28 return -1;
29 return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
30 tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
31 }
32
33 static const char *month_names[] = {
34 "January", "February", "March", "April", "May", "June",
35 "July", "August", "September", "October", "November", "December"
36 };
37
38 static const char *weekday_names[] = {
39 "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
40 };
41
42 static time_t gm_time_t(unsigned long time, int tz)
43 {
44 int minutes;
45
46 minutes = tz < 0 ? -tz : tz;
47 minutes = (minutes / 100)*60 + (minutes % 100);
48 minutes = tz < 0 ? -minutes : minutes;
49 return time + minutes * 60;
50 }
51
52 /*
53 * The "tz" thing is passed in as this strange "decimal parse of tz"
54 * thing, which means that tz -0100 is passed in as the integer -100,
55 * even though it means "sixty minutes off"
56 */
57 static struct tm *time_to_tm(unsigned long time, int tz)
58 {
59 time_t t = gm_time_t(time, tz);
60 return gmtime(&t);
61 }
62
63 /*
64 * What value of "tz" was in effect back then at "time" in the
65 * local timezone?
66 */
67 static int local_tzoffset(unsigned long time)
68 {
69 time_t t, t_local;
70 struct tm tm;
71 int offset, eastwest;
72
73 t = time;
74 localtime_r(&t, &tm);
75 t_local = tm_to_time_t(&tm);
76
77 if (t_local < t) {
78 eastwest = -1;
79 offset = t - t_local;
80 } else {
81 eastwest = 1;
82 offset = t_local - t;
83 }
84 offset /= 60; /* in minutes */
85 offset = (offset % 60) + ((offset / 60) * 100);
86 return offset * eastwest;
87 }
88
89 void show_date_relative(unsigned long time, int tz,
90 const struct timeval *now,
91 struct strbuf *timebuf)
92 {
93 unsigned long diff;
94 if (now->tv_sec < time) {
95 strbuf_addstr(timebuf, _("in the future"));
96 return;
97 }
98 diff = now->tv_sec - time;
99 if (diff < 90) {
100 strbuf_addf(timebuf,
101 Q_("%lu second ago", "%lu seconds ago", diff), diff);
102 return;
103 }
104 /* Turn it into minutes */
105 diff = (diff + 30) / 60;
106 if (diff < 90) {
107 strbuf_addf(timebuf,
108 Q_("%lu minute ago", "%lu minutes ago", diff), diff);
109 return;
110 }
111 /* Turn it into hours */
112 diff = (diff + 30) / 60;
113 if (diff < 36) {
114 strbuf_addf(timebuf,
115 Q_("%lu hour ago", "%lu hours ago", diff), diff);
116 return;
117 }
118 /* We deal with number of days from here on */
119 diff = (diff + 12) / 24;
120 if (diff < 14) {
121 strbuf_addf(timebuf,
122 Q_("%lu day ago", "%lu days ago", diff), diff);
123 return;
124 }
125 /* Say weeks for the past 10 weeks or so */
126 if (diff < 70) {
127 strbuf_addf(timebuf,
128 Q_("%lu week ago", "%lu weeks ago", (diff + 3) / 7),
129 (diff + 3) / 7);
130 return;
131 }
132 /* Say months for the past 12 months or so */
133 if (diff < 365) {
134 strbuf_addf(timebuf,
135 Q_("%lu month ago", "%lu months ago", (diff + 15) / 30),
136 (diff + 15) / 30);
137 return;
138 }
139 /* Give years and months for 5 years or so */
140 if (diff < 1825) {
141 unsigned long totalmonths = (diff * 12 * 2 + 365) / (365 * 2);
142 unsigned long years = totalmonths / 12;
143 unsigned long months = totalmonths % 12;
144 if (months) {
145 struct strbuf sb = STRBUF_INIT;
146 strbuf_addf(&sb, Q_("%lu year", "%lu years", years), years);
147 /* TRANSLATORS: "%s" is "<n> years" */
148 strbuf_addf(timebuf,
149 Q_("%s, %lu month ago", "%s, %lu months ago", months),
150 sb.buf, months);
151 strbuf_release(&sb);
152 } else
153 strbuf_addf(timebuf,
154 Q_("%lu year ago", "%lu years ago", years), years);
155 return;
156 }
157 /* Otherwise, just years. Centuries is probably overkill. */
158 strbuf_addf(timebuf,
159 Q_("%lu year ago", "%lu years ago", (diff + 183) / 365),
160 (diff + 183) / 365);
161 }
162
163 const char *show_date(unsigned long time, int tz, enum date_mode mode)
164 {
165 struct tm *tm;
166 static struct strbuf timebuf = STRBUF_INIT;
167
168 if (mode == DATE_RAW) {
169 strbuf_reset(&timebuf);
170 strbuf_addf(&timebuf, "%lu %+05d", time, tz);
171 return timebuf.buf;
172 }
173
174 if (mode == DATE_RELATIVE) {
175 struct timeval now;
176
177 strbuf_reset(&timebuf);
178 gettimeofday(&now, NULL);
179 show_date_relative(time, tz, &now, &timebuf);
180 return timebuf.buf;
181 }
182
183 if (mode == DATE_LOCAL)
184 tz = local_tzoffset(time);
185
186 tm = time_to_tm(time, tz);
187 if (!tm)
188 return NULL;
189
190 strbuf_reset(&timebuf);
191 if (mode == DATE_SHORT)
192 strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
193 tm->tm_mon + 1, tm->tm_mday);
194 else if (mode == DATE_ISO8601)
195 strbuf_addf(&timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
196 tm->tm_year + 1900,
197 tm->tm_mon + 1,
198 tm->tm_mday,
199 tm->tm_hour, tm->tm_min, tm->tm_sec,
200 tz);
201 else if (mode == DATE_RFC2822)
202 strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
203 weekday_names[tm->tm_wday], tm->tm_mday,
204 month_names[tm->tm_mon], tm->tm_year + 1900,
205 tm->tm_hour, tm->tm_min, tm->tm_sec, tz);
206 else
207 strbuf_addf(&timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d",
208 weekday_names[tm->tm_wday],
209 month_names[tm->tm_mon],
210 tm->tm_mday,
211 tm->tm_hour, tm->tm_min, tm->tm_sec,
212 tm->tm_year + 1900,
213 (mode == DATE_LOCAL) ? 0 : ' ',
214 tz);
215 return timebuf.buf;
216 }
217
218 /*
219 * Check these. And note how it doesn't do the summer-time conversion.
220 *
221 * In my world, it's always summer, and things are probably a bit off
222 * in other ways too.
223 */
224 static const struct {
225 const char *name;
226 int offset;
227 int dst;
228 } timezone_names[] = {
229 { "IDLW", -12, 0, }, /* International Date Line West */
230 { "NT", -11, 0, }, /* Nome */
231 { "CAT", -10, 0, }, /* Central Alaska */
232 { "HST", -10, 0, }, /* Hawaii Standard */
233 { "HDT", -10, 1, }, /* Hawaii Daylight */
234 { "YST", -9, 0, }, /* Yukon Standard */
235 { "YDT", -9, 1, }, /* Yukon Daylight */
236 { "PST", -8, 0, }, /* Pacific Standard */
237 { "PDT", -8, 1, }, /* Pacific Daylight */
238 { "MST", -7, 0, }, /* Mountain Standard */
239 { "MDT", -7, 1, }, /* Mountain Daylight */
240 { "CST", -6, 0, }, /* Central Standard */
241 { "CDT", -6, 1, }, /* Central Daylight */
242 { "EST", -5, 0, }, /* Eastern Standard */
243 { "EDT", -5, 1, }, /* Eastern Daylight */
244 { "AST", -3, 0, }, /* Atlantic Standard */
245 { "ADT", -3, 1, }, /* Atlantic Daylight */
246 { "WAT", -1, 0, }, /* West Africa */
247
248 { "GMT", 0, 0, }, /* Greenwich Mean */
249 { "UTC", 0, 0, }, /* Universal (Coordinated) */
250 { "Z", 0, 0, }, /* Zulu, alias for UTC */
251
252 { "WET", 0, 0, }, /* Western European */
253 { "BST", 0, 1, }, /* British Summer */
254 { "CET", +1, 0, }, /* Central European */
255 { "MET", +1, 0, }, /* Middle European */
256 { "MEWT", +1, 0, }, /* Middle European Winter */
257 { "MEST", +1, 1, }, /* Middle European Summer */
258 { "CEST", +1, 1, }, /* Central European Summer */
259 { "MESZ", +1, 1, }, /* Middle European Summer */
260 { "FWT", +1, 0, }, /* French Winter */
261 { "FST", +1, 1, }, /* French Summer */
262 { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
263 { "EEST", +2, 1, }, /* Eastern European Daylight */
264 { "WAST", +7, 0, }, /* West Australian Standard */
265 { "WADT", +7, 1, }, /* West Australian Daylight */
266 { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
267 { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
268 { "EAST", +10, 0, }, /* Eastern Australian Standard */
269 { "EADT", +10, 1, }, /* Eastern Australian Daylight */
270 { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
271 { "NZT", +12, 0, }, /* New Zealand */
272 { "NZST", +12, 0, }, /* New Zealand Standard */
273 { "NZDT", +12, 1, }, /* New Zealand Daylight */
274 { "IDLE", +12, 0, }, /* International Date Line East */
275 };
276
277 static int match_string(const char *date, const char *str)
278 {
279 int i = 0;
280
281 for (i = 0; *date; date++, str++, i++) {
282 if (*date == *str)
283 continue;
284 if (toupper(*date) == toupper(*str))
285 continue;
286 if (!isalnum(*date))
287 break;
288 return 0;
289 }
290 return i;
291 }
292
293 static int skip_alpha(const char *date)
294 {
295 int i = 0;
296 do {
297 i++;
298 } while (isalpha(date[i]));
299 return i;
300 }
301
302 /*
303 * Parse month, weekday, or timezone name
304 */
305 static int match_alpha(const char *date, struct tm *tm, int *offset)
306 {
307 int i;
308
309 for (i = 0; i < 12; i++) {
310 int match = match_string(date, month_names[i]);
311 if (match >= 3) {
312 tm->tm_mon = i;
313 return match;
314 }
315 }
316
317 for (i = 0; i < 7; i++) {
318 int match = match_string(date, weekday_names[i]);
319 if (match >= 3) {
320 tm->tm_wday = i;
321 return match;
322 }
323 }
324
325 for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
326 int match = match_string(date, timezone_names[i].name);
327 if (match >= 3 || match == strlen(timezone_names[i].name)) {
328 int off = timezone_names[i].offset;
329
330 /* This is bogus, but we like summer */
331 off += timezone_names[i].dst;
332
333 /* Only use the tz name offset if we don't have anything better */
334 if (*offset == -1)
335 *offset = 60*off;
336
337 return match;
338 }
339 }
340
341 if (match_string(date, "PM") == 2) {
342 tm->tm_hour = (tm->tm_hour % 12) + 12;
343 return 2;
344 }
345
346 if (match_string(date, "AM") == 2) {
347 tm->tm_hour = (tm->tm_hour % 12) + 0;
348 return 2;
349 }
350
351 /* BAD CRAP */
352 return skip_alpha(date);
353 }
354
355 static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
356 {
357 if (month > 0 && month < 13 && day > 0 && day < 32) {
358 struct tm check = *tm;
359 struct tm *r = (now_tm ? &check : tm);
360 time_t specified;
361
362 r->tm_mon = month - 1;
363 r->tm_mday = day;
364 if (year == -1) {
365 if (!now_tm)
366 return 1;
367 r->tm_year = now_tm->tm_year;
368 }
369 else if (year >= 1970 && year < 2100)
370 r->tm_year = year - 1900;
371 else if (year > 70 && year < 100)
372 r->tm_year = year;
373 else if (year < 38)
374 r->tm_year = year + 100;
375 else
376 return 0;
377 if (!now_tm)
378 return 1;
379
380 specified = tm_to_time_t(r);
381
382 /* Be it commit time or author time, it does not make
383 * sense to specify timestamp way into the future. Make
384 * sure it is not later than ten days from now...
385 */
386 if (now + 10*24*3600 < specified)
387 return 0;
388 tm->tm_mon = r->tm_mon;
389 tm->tm_mday = r->tm_mday;
390 if (year != -1)
391 tm->tm_year = r->tm_year;
392 return 1;
393 }
394 return 0;
395 }
396
397 static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm)
398 {
399 time_t now;
400 struct tm now_tm;
401 struct tm *refuse_future;
402 long num2, num3;
403
404 num2 = strtol(end+1, &end, 10);
405 num3 = -1;
406 if (*end == c && isdigit(end[1]))
407 num3 = strtol(end+1, &end, 10);
408
409 /* Time? Date? */
410 switch (c) {
411 case ':':
412 if (num3 < 0)
413 num3 = 0;
414 if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
415 tm->tm_hour = num;
416 tm->tm_min = num2;
417 tm->tm_sec = num3;
418 break;
419 }
420 return 0;
421
422 case '-':
423 case '/':
424 case '.':
425 now = time(NULL);
426 refuse_future = NULL;
427 if (gmtime_r(&now, &now_tm))
428 refuse_future = &now_tm;
429
430 if (num > 70) {
431 /* yyyy-mm-dd? */
432 if (is_date(num, num2, num3, refuse_future, now, tm))
433 break;
434 /* yyyy-dd-mm? */
435 if (is_date(num, num3, num2, refuse_future, now, tm))
436 break;
437 }
438 /* Our eastern European friends say dd.mm.yy[yy]
439 * is the norm there, so giving precedence to
440 * mm/dd/yy[yy] form only when separator is not '.'
441 */
442 if (c != '.' &&
443 is_date(num3, num, num2, refuse_future, now, tm))
444 break;
445 /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
446 if (is_date(num3, num2, num, refuse_future, now, tm))
447 break;
448 /* Funny European mm.dd.yy */
449 if (c == '.' &&
450 is_date(num3, num, num2, refuse_future, now, tm))
451 break;
452 return 0;
453 }
454 return end - date;
455 }
456
457 /*
458 * Have we filled in any part of the time/date yet?
459 * We just do a binary 'and' to see if the sign bit
460 * is set in all the values.
461 */
462 static inline int nodate(struct tm *tm)
463 {
464 return (tm->tm_year &
465 tm->tm_mon &
466 tm->tm_mday &
467 tm->tm_hour &
468 tm->tm_min &
469 tm->tm_sec) < 0;
470 }
471
472 /*
473 * We've seen a digit. Time? Year? Date?
474 */
475 static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
476 {
477 int n;
478 char *end;
479 unsigned long num;
480
481 num = strtoul(date, &end, 10);
482
483 /*
484 * Seconds since 1970? We trigger on that for any numbers with
485 * more than 8 digits. This is because we don't want to rule out
486 * numbers like 20070606 as a YYYYMMDD date.
487 */
488 if (num >= 100000000 && nodate(tm)) {
489 time_t time = num;
490 if (gmtime_r(&time, tm)) {
491 *tm_gmt = 1;
492 return end - date;
493 }
494 }
495
496 /*
497 * Check for special formats: num[-.:/]num[same]num
498 */
499 switch (*end) {
500 case ':':
501 case '.':
502 case '/':
503 case '-':
504 if (isdigit(end[1])) {
505 int match = match_multi_number(num, *end, date, end, tm);
506 if (match)
507 return match;
508 }
509 }
510
511 /*
512 * None of the special formats? Try to guess what
513 * the number meant. We use the number of digits
514 * to make a more educated guess..
515 */
516 n = 0;
517 do {
518 n++;
519 } while (isdigit(date[n]));
520
521 /* Four-digit year or a timezone? */
522 if (n == 4) {
523 if (num <= 1400 && *offset == -1) {
524 unsigned int minutes = num % 100;
525 unsigned int hours = num / 100;
526 *offset = hours*60 + minutes;
527 } else if (num > 1900 && num < 2100)
528 tm->tm_year = num - 1900;
529 return n;
530 }
531
532 /*
533 * Ignore lots of numerals. We took care of 4-digit years above.
534 * Days or months must be one or two digits.
535 */
536 if (n > 2)
537 return n;
538
539 /*
540 * NOTE! We will give precedence to day-of-month over month or
541 * year numbers in the 1-12 range. So 05 is always "mday 5",
542 * unless we already have a mday..
543 *
544 * IOW, 01 Apr 05 parses as "April 1st, 2005".
545 */
546 if (num > 0 && num < 32 && tm->tm_mday < 0) {
547 tm->tm_mday = num;
548 return n;
549 }
550
551 /* Two-digit year? */
552 if (n == 2 && tm->tm_year < 0) {
553 if (num < 10 && tm->tm_mday >= 0) {
554 tm->tm_year = num + 100;
555 return n;
556 }
557 if (num >= 70) {
558 tm->tm_year = num;
559 return n;
560 }
561 }
562
563 if (num > 0 && num < 13 && tm->tm_mon < 0)
564 tm->tm_mon = num-1;
565
566 return n;
567 }
568
569 static int match_tz(const char *date, int *offp)
570 {
571 char *end;
572 int hour = strtoul(date + 1, &end, 10);
573 int n = end - (date + 1);
574 int min = 0;
575
576 if (n == 4) {
577 /* hhmm */
578 min = hour % 100;
579 hour = hour / 100;
580 } else if (n != 2) {
581 min = 99; /* random crap */
582 } else if (*end == ':') {
583 /* hh:mm? */
584 min = strtoul(end + 1, &end, 10);
585 if (end - (date + 1) != 5)
586 min = 99; /* random crap */
587 } /* otherwise we parsed "hh" */
588
589 /*
590 * Don't accept any random crap. Even though some places have
591 * offset larger than 12 hours (e.g. Pacific/Kiritimati is at
592 * UTC+14), there is something wrong if hour part is much
593 * larger than that. We might also want to check that the
594 * minutes are divisible by 15 or something too. (Offset of
595 * Kathmandu, Nepal is UTC+5:45)
596 */
597 if (min < 60 && hour < 24) {
598 int offset = hour * 60 + min;
599 if (*date == '-')
600 offset = -offset;
601 *offp = offset;
602 }
603 return end - date;
604 }
605
606 static int date_string(unsigned long date, int offset, char *buf, int len)
607 {
608 int sign = '+';
609
610 if (offset < 0) {
611 offset = -offset;
612 sign = '-';
613 }
614 return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
615 }
616
617 /*
618 * Parse a string like "0 +0000" as ancient timestamp near epoch, but
619 * only when it appears not as part of any other string.
620 */
621 static int match_object_header_date(const char *date, unsigned long *timestamp, int *offset)
622 {
623 char *end;
624 unsigned long stamp;
625 int ofs;
626
627 if (*date < '0' || '9' < *date)
628 return -1;
629 stamp = strtoul(date, &end, 10);
630 if (*end != ' ' || stamp == ULONG_MAX || (end[1] != '+' && end[1] != '-'))
631 return -1;
632 date = end + 2;
633 ofs = strtol(date, &end, 10);
634 if ((*end != '\0' && (*end != '\n')) || end != date + 4)
635 return -1;
636 ofs = (ofs / 100) * 60 + (ofs % 100);
637 if (date[-1] == '-')
638 ofs = -ofs;
639 *timestamp = stamp;
640 *offset = ofs;
641 return 0;
642 }
643
644 /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
645 (i.e. English) day/month names, and it doesn't work correctly with %z. */
646 int parse_date_basic(const char *date, unsigned long *timestamp, int *offset)
647 {
648 struct tm tm;
649 int tm_gmt;
650 unsigned long dummy_timestamp;
651 int dummy_offset;
652
653 if (!timestamp)
654 timestamp = &dummy_timestamp;
655 if (!offset)
656 offset = &dummy_offset;
657
658 memset(&tm, 0, sizeof(tm));
659 tm.tm_year = -1;
660 tm.tm_mon = -1;
661 tm.tm_mday = -1;
662 tm.tm_isdst = -1;
663 tm.tm_hour = -1;
664 tm.tm_min = -1;
665 tm.tm_sec = -1;
666 *offset = -1;
667 tm_gmt = 0;
668
669 if (*date == '@' &&
670 !match_object_header_date(date + 1, timestamp, offset))
671 return 0; /* success */
672 for (;;) {
673 int match = 0;
674 unsigned char c = *date;
675
676 /* Stop at end of string or newline */
677 if (!c || c == '\n')
678 break;
679
680 if (isalpha(c))
681 match = match_alpha(date, &tm, offset);
682 else if (isdigit(c))
683 match = match_digit(date, &tm, offset, &tm_gmt);
684 else if ((c == '-' || c == '+') && isdigit(date[1]))
685 match = match_tz(date, offset);
686
687 if (!match) {
688 /* BAD CRAP */
689 match = 1;
690 }
691
692 date += match;
693 }
694
695 /* mktime uses local timezone */
696 *timestamp = tm_to_time_t(&tm);
697 if (*offset == -1)
698 *offset = ((time_t)*timestamp - mktime(&tm)) / 60;
699
700 if (*timestamp == -1)
701 return -1;
702
703 if (!tm_gmt)
704 *timestamp -= *offset * 60;
705 return 0; /* success */
706 }
707
708 int parse_date(const char *date, char *result, int maxlen)
709 {
710 unsigned long timestamp;
711 int offset;
712 if (parse_date_basic(date, &timestamp, &offset))
713 return -1;
714 return date_string(timestamp, offset, result, maxlen);
715 }
716
717 enum date_mode parse_date_format(const char *format)
718 {
719 if (!strcmp(format, "relative"))
720 return DATE_RELATIVE;
721 else if (!strcmp(format, "iso8601") ||
722 !strcmp(format, "iso"))
723 return DATE_ISO8601;
724 else if (!strcmp(format, "rfc2822") ||
725 !strcmp(format, "rfc"))
726 return DATE_RFC2822;
727 else if (!strcmp(format, "short"))
728 return DATE_SHORT;
729 else if (!strcmp(format, "local"))
730 return DATE_LOCAL;
731 else if (!strcmp(format, "default"))
732 return DATE_NORMAL;
733 else if (!strcmp(format, "raw"))
734 return DATE_RAW;
735 else
736 die("unknown date format %s", format);
737 }
738
739 void datestamp(char *buf, int bufsize)
740 {
741 time_t now;
742 int offset;
743
744 time(&now);
745
746 offset = tm_to_time_t(localtime(&now)) - now;
747 offset /= 60;
748
749 date_string(now, offset, buf, bufsize);
750 }
751
752 /*
753 * Relative time update (eg "2 days ago"). If we haven't set the time
754 * yet, we need to set it from current time.
755 */
756 static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec)
757 {
758 time_t n;
759
760 if (tm->tm_mday < 0)
761 tm->tm_mday = now->tm_mday;
762 if (tm->tm_mon < 0)
763 tm->tm_mon = now->tm_mon;
764 if (tm->tm_year < 0) {
765 tm->tm_year = now->tm_year;
766 if (tm->tm_mon > now->tm_mon)
767 tm->tm_year--;
768 }
769
770 n = mktime(tm) - sec;
771 localtime_r(&n, tm);
772 return n;
773 }
774
775 static void date_now(struct tm *tm, struct tm *now, int *num)
776 {
777 update_tm(tm, now, 0);
778 }
779
780 static void date_yesterday(struct tm *tm, struct tm *now, int *num)
781 {
782 update_tm(tm, now, 24*60*60);
783 }
784
785 static void date_time(struct tm *tm, struct tm *now, int hour)
786 {
787 if (tm->tm_hour < hour)
788 date_yesterday(tm, now, NULL);
789 tm->tm_hour = hour;
790 tm->tm_min = 0;
791 tm->tm_sec = 0;
792 }
793
794 static void date_midnight(struct tm *tm, struct tm *now, int *num)
795 {
796 date_time(tm, now, 0);
797 }
798
799 static void date_noon(struct tm *tm, struct tm *now, int *num)
800 {
801 date_time(tm, now, 12);
802 }
803
804 static void date_tea(struct tm *tm, struct tm *now, int *num)
805 {
806 date_time(tm, now, 17);
807 }
808
809 static void date_pm(struct tm *tm, struct tm *now, int *num)
810 {
811 int hour, n = *num;
812 *num = 0;
813
814 hour = tm->tm_hour;
815 if (n) {
816 hour = n;
817 tm->tm_min = 0;
818 tm->tm_sec = 0;
819 }
820 tm->tm_hour = (hour % 12) + 12;
821 }
822
823 static void date_am(struct tm *tm, struct tm *now, int *num)
824 {
825 int hour, n = *num;
826 *num = 0;
827
828 hour = tm->tm_hour;
829 if (n) {
830 hour = n;
831 tm->tm_min = 0;
832 tm->tm_sec = 0;
833 }
834 tm->tm_hour = (hour % 12);
835 }
836
837 static void date_never(struct tm *tm, struct tm *now, int *num)
838 {
839 time_t n = 0;
840 localtime_r(&n, tm);
841 }
842
843 static const struct special {
844 const char *name;
845 void (*fn)(struct tm *, struct tm *, int *);
846 } special[] = {
847 { "yesterday", date_yesterday },
848 { "noon", date_noon },
849 { "midnight", date_midnight },
850 { "tea", date_tea },
851 { "PM", date_pm },
852 { "AM", date_am },
853 { "never", date_never },
854 { "now", date_now },
855 { NULL }
856 };
857
858 static const char *number_name[] = {
859 "zero", "one", "two", "three", "four",
860 "five", "six", "seven", "eight", "nine", "ten",
861 };
862
863 static const struct typelen {
864 const char *type;
865 int length;
866 } typelen[] = {
867 { "seconds", 1 },
868 { "minutes", 60 },
869 { "hours", 60*60 },
870 { "days", 24*60*60 },
871 { "weeks", 7*24*60*60 },
872 { NULL }
873 };
874
875 static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched)
876 {
877 const struct typelen *tl;
878 const struct special *s;
879 const char *end = date;
880 int i;
881
882 while (isalpha(*++end));
883 ;
884
885 for (i = 0; i < 12; i++) {
886 int match = match_string(date, month_names[i]);
887 if (match >= 3) {
888 tm->tm_mon = i;
889 *touched = 1;
890 return end;
891 }
892 }
893
894 for (s = special; s->name; s++) {
895 int len = strlen(s->name);
896 if (match_string(date, s->name) == len) {
897 s->fn(tm, now, num);
898 *touched = 1;
899 return end;
900 }
901 }
902
903 if (!*num) {
904 for (i = 1; i < 11; i++) {
905 int len = strlen(number_name[i]);
906 if (match_string(date, number_name[i]) == len) {
907 *num = i;
908 *touched = 1;
909 return end;
910 }
911 }
912 if (match_string(date, "last") == 4) {
913 *num = 1;
914 *touched = 1;
915 }
916 return end;
917 }
918
919 tl = typelen;
920 while (tl->type) {
921 int len = strlen(tl->type);
922 if (match_string(date, tl->type) >= len-1) {
923 update_tm(tm, now, tl->length * *num);
924 *num = 0;
925 *touched = 1;
926 return end;
927 }
928 tl++;
929 }
930
931 for (i = 0; i < 7; i++) {
932 int match = match_string(date, weekday_names[i]);
933 if (match >= 3) {
934 int diff, n = *num -1;
935 *num = 0;
936
937 diff = tm->tm_wday - i;
938 if (diff <= 0)
939 n++;
940 diff += 7*n;
941
942 update_tm(tm, now, diff * 24 * 60 * 60);
943 *touched = 1;
944 return end;
945 }
946 }
947
948 if (match_string(date, "months") >= 5) {
949 int n;
950 update_tm(tm, now, 0); /* fill in date fields if needed */
951 n = tm->tm_mon - *num;
952 *num = 0;
953 while (n < 0) {
954 n += 12;
955 tm->tm_year--;
956 }
957 tm->tm_mon = n;
958 *touched = 1;
959 return end;
960 }
961
962 if (match_string(date, "years") >= 4) {
963 update_tm(tm, now, 0); /* fill in date fields if needed */
964 tm->tm_year -= *num;
965 *num = 0;
966 *touched = 1;
967 return end;
968 }
969
970 return end;
971 }
972
973 static const char *approxidate_digit(const char *date, struct tm *tm, int *num)
974 {
975 char *end;
976 unsigned long number = strtoul(date, &end, 10);
977
978 switch (*end) {
979 case ':':
980 case '.':
981 case '/':
982 case '-':
983 if (isdigit(end[1])) {
984 int match = match_multi_number(number, *end, date, end, tm);
985 if (match)
986 return date + match;
987 }
988 }
989
990 /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
991 if (date[0] != '0' || end - date <= 2)
992 *num = number;
993 return end;
994 }
995
996 /*
997 * Do we have a pending number at the end, or when
998 * we see a new one? Let's assume it's a month day,
999 * as in "Dec 6, 1992"
1000 */
1001 static void pending_number(struct tm *tm, int *num)
1002 {
1003 int number = *num;
1004
1005 if (number) {
1006 *num = 0;
1007 if (tm->tm_mday < 0 && number < 32)
1008 tm->tm_mday = number;
1009 else if (tm->tm_mon < 0 && number < 13)
1010 tm->tm_mon = number-1;
1011 else if (tm->tm_year < 0) {
1012 if (number > 1969 && number < 2100)
1013 tm->tm_year = number - 1900;
1014 else if (number > 69 && number < 100)
1015 tm->tm_year = number;
1016 else if (number < 38)
1017 tm->tm_year = 100 + number;
1018 /* We screw up for number = 00 ? */
1019 }
1020 }
1021 }
1022
1023 static unsigned long approxidate_str(const char *date,
1024 const struct timeval *tv,
1025 int *error_ret)
1026 {
1027 int number = 0;
1028 int touched = 0;
1029 struct tm tm, now;
1030 time_t time_sec;
1031
1032 time_sec = tv->tv_sec;
1033 localtime_r(&time_sec, &tm);
1034 now = tm;
1035
1036 tm.tm_year = -1;
1037 tm.tm_mon = -1;
1038 tm.tm_mday = -1;
1039
1040 for (;;) {
1041 unsigned char c = *date;
1042 if (!c)
1043 break;
1044 date++;
1045 if (isdigit(c)) {
1046 pending_number(&tm, &number);
1047 date = approxidate_digit(date-1, &tm, &number);
1048 touched = 1;
1049 continue;
1050 }
1051 if (isalpha(c))
1052 date = approxidate_alpha(date-1, &tm, &now, &number, &touched);
1053 }
1054 pending_number(&tm, &number);
1055 if (!touched)
1056 *error_ret = 1;
1057 return update_tm(&tm, &now, 0);
1058 }
1059
1060 unsigned long approxidate_relative(const char *date, const struct timeval *tv)
1061 {
1062 unsigned long timestamp;
1063 int offset;
1064 int errors = 0;
1065
1066 if (!parse_date_basic(date, &timestamp, &offset))
1067 return timestamp;
1068 return approxidate_str(date, tv, &errors);
1069 }
1070
1071 unsigned long approxidate_careful(const char *date, int *error_ret)
1072 {
1073 struct timeval tv;
1074 unsigned long timestamp;
1075 int offset;
1076 int dummy = 0;
1077 if (!error_ret)
1078 error_ret = &dummy;
1079
1080 if (!parse_date_basic(date, &timestamp, &offset)) {
1081 *error_ret = 0;
1082 return timestamp;
1083 }
1084
1085 gettimeofday(&tv, NULL);
1086 return approxidate_str(date, &tv, error_ret);
1087 }
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