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debian: Release git 1:2.9.3-1
[git/debian.git] / date.c
blob4c7aa9ba853c0924d49f4b8c2cc06826fe08956c
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 == -1)
78 return 0; /* error; just use +0000 */
79 if (t_local < t) {
80 eastwest = -1;
81 offset = t - t_local;
82 } else {
83 eastwest = 1;
84 offset = t_local - t;
85 }
86 offset /= 60; /* in minutes */
87 offset = (offset % 60) + ((offset / 60) * 100);
88 return offset * eastwest;
89 }
90
91 void show_date_relative(unsigned long time, int tz,
92 const struct timeval *now,
93 struct strbuf *timebuf)
94 {
95 unsigned long diff;
96 if (now->tv_sec < time) {
97 strbuf_addstr(timebuf, _("in the future"));
98 return;
99 }
100 diff = now->tv_sec - time;
101 if (diff < 90) {
102 strbuf_addf(timebuf,
103 Q_("%lu second ago", "%lu seconds ago", diff), diff);
104 return;
105 }
106 /* Turn it into minutes */
107 diff = (diff + 30) / 60;
108 if (diff < 90) {
109 strbuf_addf(timebuf,
110 Q_("%lu minute ago", "%lu minutes ago", diff), diff);
111 return;
112 }
113 /* Turn it into hours */
114 diff = (diff + 30) / 60;
115 if (diff < 36) {
116 strbuf_addf(timebuf,
117 Q_("%lu hour ago", "%lu hours ago", diff), diff);
118 return;
119 }
120 /* We deal with number of days from here on */
121 diff = (diff + 12) / 24;
122 if (diff < 14) {
123 strbuf_addf(timebuf,
124 Q_("%lu day ago", "%lu days ago", diff), diff);
125 return;
126 }
127 /* Say weeks for the past 10 weeks or so */
128 if (diff < 70) {
129 strbuf_addf(timebuf,
130 Q_("%lu week ago", "%lu weeks ago", (diff + 3) / 7),
131 (diff + 3) / 7);
132 return;
133 }
134 /* Say months for the past 12 months or so */
135 if (diff < 365) {
136 strbuf_addf(timebuf,
137 Q_("%lu month ago", "%lu months ago", (diff + 15) / 30),
138 (diff + 15) / 30);
139 return;
140 }
141 /* Give years and months for 5 years or so */
142 if (diff < 1825) {
143 unsigned long totalmonths = (diff * 12 * 2 + 365) / (365 * 2);
144 unsigned long years = totalmonths / 12;
145 unsigned long months = totalmonths % 12;
146 if (months) {
147 struct strbuf sb = STRBUF_INIT;
148 strbuf_addf(&sb, Q_("%lu year", "%lu years", years), years);
149 strbuf_addf(timebuf,
150 /* TRANSLATORS: "%s" is "<n> years" */
151 Q_("%s, %lu month ago", "%s, %lu months ago", months),
152 sb.buf, months);
153 strbuf_release(&sb);
154 } else
155 strbuf_addf(timebuf,
156 Q_("%lu year ago", "%lu years ago", years), years);
157 return;
158 }
159 /* Otherwise, just years. Centuries is probably overkill. */
160 strbuf_addf(timebuf,
161 Q_("%lu year ago", "%lu years ago", (diff + 183) / 365),
162 (diff + 183) / 365);
163 }
164
165 struct date_mode *date_mode_from_type(enum date_mode_type type)
166 {
167 static struct date_mode mode;
168 if (type == DATE_STRFTIME)
169 die("BUG: cannot create anonymous strftime date_mode struct");
170 mode.type = type;
171 mode.local = 0;
172 return &mode;
173 }
174
175 const char *show_date(unsigned long time, int tz, const struct date_mode *mode)
176 {
177 struct tm *tm;
178 static struct strbuf timebuf = STRBUF_INIT;
179
180 if (mode->local)
181 tz = local_tzoffset(time);
182
183 if (mode->type == DATE_RAW) {
184 strbuf_reset(&timebuf);
185 strbuf_addf(&timebuf, "%lu %+05d", time, tz);
186 return timebuf.buf;
187 }
188
189 if (mode->type == DATE_RELATIVE) {
190 struct timeval now;
191
192 strbuf_reset(&timebuf);
193 gettimeofday(&now, NULL);
194 show_date_relative(time, tz, &now, &timebuf);
195 return timebuf.buf;
196 }
197
198 tm = time_to_tm(time, tz);
199 if (!tm) {
200 tm = time_to_tm(0, 0);
201 tz = 0;
202 }
203
204 strbuf_reset(&timebuf);
205 if (mode->type == DATE_SHORT)
206 strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
207 tm->tm_mon + 1, tm->tm_mday);
208 else if (mode->type == DATE_ISO8601)
209 strbuf_addf(&timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
210 tm->tm_year + 1900,
211 tm->tm_mon + 1,
212 tm->tm_mday,
213 tm->tm_hour, tm->tm_min, tm->tm_sec,
214 tz);
215 else if (mode->type == DATE_ISO8601_STRICT) {
216 char sign = (tz >= 0) ? '+' : '-';
217 tz = abs(tz);
218 strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d",
219 tm->tm_year + 1900,
220 tm->tm_mon + 1,
221 tm->tm_mday,
222 tm->tm_hour, tm->tm_min, tm->tm_sec,
223 sign, tz / 100, tz % 100);
224 } else if (mode->type == DATE_RFC2822)
225 strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
226 weekday_names[tm->tm_wday], tm->tm_mday,
227 month_names[tm->tm_mon], tm->tm_year + 1900,
228 tm->tm_hour, tm->tm_min, tm->tm_sec, tz);
229 else if (mode->type == DATE_STRFTIME)
230 strbuf_addftime(&timebuf, mode->strftime_fmt, tm);
231 else
232 strbuf_addf(&timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d",
233 weekday_names[tm->tm_wday],
234 month_names[tm->tm_mon],
235 tm->tm_mday,
236 tm->tm_hour, tm->tm_min, tm->tm_sec,
237 tm->tm_year + 1900,
238 mode->local ? 0 : ' ',
239 tz);
240 return timebuf.buf;
241 }
242
243 /*
244 * Check these. And note how it doesn't do the summer-time conversion.
245 *
246 * In my world, it's always summer, and things are probably a bit off
247 * in other ways too.
248 */
249 static const struct {
250 const char *name;
251 int offset;
252 int dst;
253 } timezone_names[] = {
254 { "IDLW", -12, 0, }, /* International Date Line West */
255 { "NT", -11, 0, }, /* Nome */
256 { "CAT", -10, 0, }, /* Central Alaska */
257 { "HST", -10, 0, }, /* Hawaii Standard */
258 { "HDT", -10, 1, }, /* Hawaii Daylight */
259 { "YST", -9, 0, }, /* Yukon Standard */
260 { "YDT", -9, 1, }, /* Yukon Daylight */
261 { "PST", -8, 0, }, /* Pacific Standard */
262 { "PDT", -8, 1, }, /* Pacific Daylight */
263 { "MST", -7, 0, }, /* Mountain Standard */
264 { "MDT", -7, 1, }, /* Mountain Daylight */
265 { "CST", -6, 0, }, /* Central Standard */
266 { "CDT", -6, 1, }, /* Central Daylight */
267 { "EST", -5, 0, }, /* Eastern Standard */
268 { "EDT", -5, 1, }, /* Eastern Daylight */
269 { "AST", -3, 0, }, /* Atlantic Standard */
270 { "ADT", -3, 1, }, /* Atlantic Daylight */
271 { "WAT", -1, 0, }, /* West Africa */
272
273 { "GMT", 0, 0, }, /* Greenwich Mean */
274 { "UTC", 0, 0, }, /* Universal (Coordinated) */
275 { "Z", 0, 0, }, /* Zulu, alias for UTC */
276
277 { "WET", 0, 0, }, /* Western European */
278 { "BST", 0, 1, }, /* British Summer */
279 { "CET", +1, 0, }, /* Central European */
280 { "MET", +1, 0, }, /* Middle European */
281 { "MEWT", +1, 0, }, /* Middle European Winter */
282 { "MEST", +1, 1, }, /* Middle European Summer */
283 { "CEST", +1, 1, }, /* Central European Summer */
284 { "MESZ", +1, 1, }, /* Middle European Summer */
285 { "FWT", +1, 0, }, /* French Winter */
286 { "FST", +1, 1, }, /* French Summer */
287 { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
288 { "EEST", +2, 1, }, /* Eastern European Daylight */
289 { "WAST", +7, 0, }, /* West Australian Standard */
290 { "WADT", +7, 1, }, /* West Australian Daylight */
291 { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
292 { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
293 { "EAST", +10, 0, }, /* Eastern Australian Standard */
294 { "EADT", +10, 1, }, /* Eastern Australian Daylight */
295 { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
296 { "NZT", +12, 0, }, /* New Zealand */
297 { "NZST", +12, 0, }, /* New Zealand Standard */
298 { "NZDT", +12, 1, }, /* New Zealand Daylight */
299 { "IDLE", +12, 0, }, /* International Date Line East */
300 };
301
302 static int match_string(const char *date, const char *str)
303 {
304 int i = 0;
305
306 for (i = 0; *date; date++, str++, i++) {
307 if (*date == *str)
308 continue;
309 if (toupper(*date) == toupper(*str))
310 continue;
311 if (!isalnum(*date))
312 break;
313 return 0;
314 }
315 return i;
316 }
317
318 static int skip_alpha(const char *date)
319 {
320 int i = 0;
321 do {
322 i++;
323 } while (isalpha(date[i]));
324 return i;
325 }
326
327 /*
328 * Parse month, weekday, or timezone name
329 */
330 static int match_alpha(const char *date, struct tm *tm, int *offset)
331 {
332 int i;
333
334 for (i = 0; i < 12; i++) {
335 int match = match_string(date, month_names[i]);
336 if (match >= 3) {
337 tm->tm_mon = i;
338 return match;
339 }
340 }
341
342 for (i = 0; i < 7; i++) {
343 int match = match_string(date, weekday_names[i]);
344 if (match >= 3) {
345 tm->tm_wday = i;
346 return match;
347 }
348 }
349
350 for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
351 int match = match_string(date, timezone_names[i].name);
352 if (match >= 3 || match == strlen(timezone_names[i].name)) {
353 int off = timezone_names[i].offset;
354
355 /* This is bogus, but we like summer */
356 off += timezone_names[i].dst;
357
358 /* Only use the tz name offset if we don't have anything better */
359 if (*offset == -1)
360 *offset = 60*off;
361
362 return match;
363 }
364 }
365
366 if (match_string(date, "PM") == 2) {
367 tm->tm_hour = (tm->tm_hour % 12) + 12;
368 return 2;
369 }
370
371 if (match_string(date, "AM") == 2) {
372 tm->tm_hour = (tm->tm_hour % 12) + 0;
373 return 2;
374 }
375
376 /* BAD CRAP */
377 return skip_alpha(date);
378 }
379
380 static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
381 {
382 if (month > 0 && month < 13 && day > 0 && day < 32) {
383 struct tm check = *tm;
384 struct tm *r = (now_tm ? &check : tm);
385 time_t specified;
386
387 r->tm_mon = month - 1;
388 r->tm_mday = day;
389 if (year == -1) {
390 if (!now_tm)
391 return 1;
392 r->tm_year = now_tm->tm_year;
393 }
394 else if (year >= 1970 && year < 2100)
395 r->tm_year = year - 1900;
396 else if (year > 70 && year < 100)
397 r->tm_year = year;
398 else if (year < 38)
399 r->tm_year = year + 100;
400 else
401 return 0;
402 if (!now_tm)
403 return 1;
404
405 specified = tm_to_time_t(r);
406
407 /* Be it commit time or author time, it does not make
408 * sense to specify timestamp way into the future. Make
409 * sure it is not later than ten days from now...
410 */
411 if ((specified != -1) && (now + 10*24*3600 < specified))
412 return 0;
413 tm->tm_mon = r->tm_mon;
414 tm->tm_mday = r->tm_mday;
415 if (year != -1)
416 tm->tm_year = r->tm_year;
417 return 1;
418 }
419 return 0;
420 }
421
422 static int match_multi_number(unsigned long num, char c, const char *date,
423 char *end, struct tm *tm, time_t now)
424 {
425 struct tm now_tm;
426 struct tm *refuse_future;
427 long num2, num3;
428
429 num2 = strtol(end+1, &end, 10);
430 num3 = -1;
431 if (*end == c && isdigit(end[1]))
432 num3 = strtol(end+1, &end, 10);
433
434 /* Time? Date? */
435 switch (c) {
436 case ':':
437 if (num3 < 0)
438 num3 = 0;
439 if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
440 tm->tm_hour = num;
441 tm->tm_min = num2;
442 tm->tm_sec = num3;
443 break;
444 }
445 return 0;
446
447 case '-':
448 case '/':
449 case '.':
450 if (!now)
451 now = time(NULL);
452 refuse_future = NULL;
453 if (gmtime_r(&now, &now_tm))
454 refuse_future = &now_tm;
455
456 if (num > 70) {
457 /* yyyy-mm-dd? */
458 if (is_date(num, num2, num3, NULL, now, tm))
459 break;
460 /* yyyy-dd-mm? */
461 if (is_date(num, num3, num2, NULL, now, tm))
462 break;
463 }
464 /* Our eastern European friends say dd.mm.yy[yy]
465 * is the norm there, so giving precedence to
466 * mm/dd/yy[yy] form only when separator is not '.'
467 */
468 if (c != '.' &&
469 is_date(num3, num, num2, refuse_future, now, tm))
470 break;
471 /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
472 if (is_date(num3, num2, num, refuse_future, now, tm))
473 break;
474 /* Funny European mm.dd.yy */
475 if (c == '.' &&
476 is_date(num3, num, num2, refuse_future, now, tm))
477 break;
478 return 0;
479 }
480 return end - date;
481 }
482
483 /*
484 * Have we filled in any part of the time/date yet?
485 * We just do a binary 'and' to see if the sign bit
486 * is set in all the values.
487 */
488 static inline int nodate(struct tm *tm)
489 {
490 return (tm->tm_year &
491 tm->tm_mon &
492 tm->tm_mday &
493 tm->tm_hour &
494 tm->tm_min &
495 tm->tm_sec) < 0;
496 }
497
498 /*
499 * We've seen a digit. Time? Year? Date?
500 */
501 static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
502 {
503 int n;
504 char *end;
505 unsigned long num;
506
507 num = strtoul(date, &end, 10);
508
509 /*
510 * Seconds since 1970? We trigger on that for any numbers with
511 * more than 8 digits. This is because we don't want to rule out
512 * numbers like 20070606 as a YYYYMMDD date.
513 */
514 if (num >= 100000000 && nodate(tm)) {
515 time_t time = num;
516 if (gmtime_r(&time, tm)) {
517 *tm_gmt = 1;
518 return end - date;
519 }
520 }
521
522 /*
523 * Check for special formats: num[-.:/]num[same]num
524 */
525 switch (*end) {
526 case ':':
527 case '.':
528 case '/':
529 case '-':
530 if (isdigit(end[1])) {
531 int match = match_multi_number(num, *end, date, end, tm, 0);
532 if (match)
533 return match;
534 }
535 }
536
537 /*
538 * None of the special formats? Try to guess what
539 * the number meant. We use the number of digits
540 * to make a more educated guess..
541 */
542 n = 0;
543 do {
544 n++;
545 } while (isdigit(date[n]));
546
547 /* Four-digit year or a timezone? */
548 if (n == 4) {
549 if (num <= 1400 && *offset == -1) {
550 unsigned int minutes = num % 100;
551 unsigned int hours = num / 100;
552 *offset = hours*60 + minutes;
553 } else if (num > 1900 && num < 2100)
554 tm->tm_year = num - 1900;
555 return n;
556 }
557
558 /*
559 * Ignore lots of numerals. We took care of 4-digit years above.
560 * Days or months must be one or two digits.
561 */
562 if (n > 2)
563 return n;
564
565 /*
566 * NOTE! We will give precedence to day-of-month over month or
567 * year numbers in the 1-12 range. So 05 is always "mday 5",
568 * unless we already have a mday..
569 *
570 * IOW, 01 Apr 05 parses as "April 1st, 2005".
571 */
572 if (num > 0 && num < 32 && tm->tm_mday < 0) {
573 tm->tm_mday = num;
574 return n;
575 }
576
577 /* Two-digit year? */
578 if (n == 2 && tm->tm_year < 0) {
579 if (num < 10 && tm->tm_mday >= 0) {
580 tm->tm_year = num + 100;
581 return n;
582 }
583 if (num >= 70) {
584 tm->tm_year = num;
585 return n;
586 }
587 }
588
589 if (num > 0 && num < 13 && tm->tm_mon < 0)
590 tm->tm_mon = num-1;
591
592 return n;
593 }
594
595 static int match_tz(const char *date, int *offp)
596 {
597 char *end;
598 int hour = strtoul(date + 1, &end, 10);
599 int n = end - (date + 1);
600 int min = 0;
601
602 if (n == 4) {
603 /* hhmm */
604 min = hour % 100;
605 hour = hour / 100;
606 } else if (n != 2) {
607 min = 99; /* random crap */
608 } else if (*end == ':') {
609 /* hh:mm? */
610 min = strtoul(end + 1, &end, 10);
611 if (end - (date + 1) != 5)
612 min = 99; /* random crap */
613 } /* otherwise we parsed "hh" */
614
615 /*
616 * Don't accept any random crap. Even though some places have
617 * offset larger than 12 hours (e.g. Pacific/Kiritimati is at
618 * UTC+14), there is something wrong if hour part is much
619 * larger than that. We might also want to check that the
620 * minutes are divisible by 15 or something too. (Offset of
621 * Kathmandu, Nepal is UTC+5:45)
622 */
623 if (min < 60 && hour < 24) {
624 int offset = hour * 60 + min;
625 if (*date == '-')
626 offset = -offset;
627 *offp = offset;
628 }
629 return end - date;
630 }
631
632 static void date_string(unsigned long date, int offset, struct strbuf *buf)
633 {
634 int sign = '+';
635
636 if (offset < 0) {
637 offset = -offset;
638 sign = '-';
639 }
640 strbuf_addf(buf, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
641 }
642
643 /*
644 * Parse a string like "0 +0000" as ancient timestamp near epoch, but
645 * only when it appears not as part of any other string.
646 */
647 static int match_object_header_date(const char *date, unsigned long *timestamp, int *offset)
648 {
649 char *end;
650 unsigned long stamp;
651 int ofs;
652
653 if (*date < '0' || '9' < *date)
654 return -1;
655 stamp = strtoul(date, &end, 10);
656 if (*end != ' ' || stamp == ULONG_MAX || (end[1] != '+' && end[1] != '-'))
657 return -1;
658 date = end + 2;
659 ofs = strtol(date, &end, 10);
660 if ((*end != '\0' && (*end != '\n')) || end != date + 4)
661 return -1;
662 ofs = (ofs / 100) * 60 + (ofs % 100);
663 if (date[-1] == '-')
664 ofs = -ofs;
665 *timestamp = stamp;
666 *offset = ofs;
667 return 0;
668 }
669
670 /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
671 (i.e. English) day/month names, and it doesn't work correctly with %z. */
672 int parse_date_basic(const char *date, unsigned long *timestamp, int *offset)
673 {
674 struct tm tm;
675 int tm_gmt;
676 unsigned long dummy_timestamp;
677 int dummy_offset;
678
679 if (!timestamp)
680 timestamp = &dummy_timestamp;
681 if (!offset)
682 offset = &dummy_offset;
683
684 memset(&tm, 0, sizeof(tm));
685 tm.tm_year = -1;
686 tm.tm_mon = -1;
687 tm.tm_mday = -1;
688 tm.tm_isdst = -1;
689 tm.tm_hour = -1;
690 tm.tm_min = -1;
691 tm.tm_sec = -1;
692 *offset = -1;
693 tm_gmt = 0;
694
695 if (*date == '@' &&
696 !match_object_header_date(date + 1, timestamp, offset))
697 return 0; /* success */
698 for (;;) {
699 int match = 0;
700 unsigned char c = *date;
701
702 /* Stop at end of string or newline */
703 if (!c || c == '\n')
704 break;
705
706 if (isalpha(c))
707 match = match_alpha(date, &tm, offset);
708 else if (isdigit(c))
709 match = match_digit(date, &tm, offset, &tm_gmt);
710 else if ((c == '-' || c == '+') && isdigit(date[1]))
711 match = match_tz(date, offset);
712
713 if (!match) {
714 /* BAD CRAP */
715 match = 1;
716 }
717
718 date += match;
719 }
720
721 /* do not use mktime(), which uses local timezone, here */
722 *timestamp = tm_to_time_t(&tm);
723 if (*timestamp == -1)
724 return -1;
725
726 if (*offset == -1) {
727 time_t temp_time;
728
729 /* gmtime_r() in match_digit() may have clobbered it */
730 tm.tm_isdst = -1;
731 temp_time = mktime(&tm);
732 if ((time_t)*timestamp > temp_time) {
733 *offset = ((time_t)*timestamp - temp_time) / 60;
734 } else {
735 *offset = -(int)((temp_time - (time_t)*timestamp) / 60);
736 }
737 }
738
739 if (!tm_gmt)
740 *timestamp -= *offset * 60;
741 return 0; /* success */
742 }
743
744 int parse_expiry_date(const char *date, unsigned long *timestamp)
745 {
746 int errors = 0;
747
748 if (!strcmp(date, "never") || !strcmp(date, "false"))
749 *timestamp = 0;
750 else if (!strcmp(date, "all") || !strcmp(date, "now"))
751 /*
752 * We take over "now" here, which usually translates
753 * to the current timestamp. This is because the user
754 * really means to expire everything she has done in
755 * the past, and by definition reflogs are the record
756 * of the past, and there is nothing from the future
757 * to be kept.
758 */
759 *timestamp = ULONG_MAX;
760 else
761 *timestamp = approxidate_careful(date, &errors);
762
763 return errors;
764 }
765
766 int parse_date(const char *date, struct strbuf *result)
767 {
768 unsigned long timestamp;
769 int offset;
770 if (parse_date_basic(date, &timestamp, &offset))
771 return -1;
772 date_string(timestamp, offset, result);
773 return 0;
774 }
775
776 static enum date_mode_type parse_date_type(const char *format, const char **end)
777 {
778 if (skip_prefix(format, "relative", end))
779 return DATE_RELATIVE;
780 if (skip_prefix(format, "iso8601-strict", end) ||
781 skip_prefix(format, "iso-strict", end))
782 return DATE_ISO8601_STRICT;
783 if (skip_prefix(format, "iso8601", end) ||
784 skip_prefix(format, "iso", end))
785 return DATE_ISO8601;
786 if (skip_prefix(format, "rfc2822", end) ||
787 skip_prefix(format, "rfc", end))
788 return DATE_RFC2822;
789 if (skip_prefix(format, "short", end))
790 return DATE_SHORT;
791 if (skip_prefix(format, "default", end))
792 return DATE_NORMAL;
793 if (skip_prefix(format, "raw", end))
794 return DATE_RAW;
795 if (skip_prefix(format, "format", end))
796 return DATE_STRFTIME;
797
798 die("unknown date format %s", format);
799 }
800
801 void parse_date_format(const char *format, struct date_mode *mode)
802 {
803 const char *p;
804
805 /* historical alias */
806 if (!strcmp(format, "local"))
807 format = "default-local";
808
809 mode->type = parse_date_type(format, &p);
810 mode->local = 0;
811
812 if (skip_prefix(p, "-local", &p))
813 mode->local = 1;
814
815 if (mode->type == DATE_STRFTIME) {
816 if (!skip_prefix(p, ":", &p))
817 die("date format missing colon separator: %s", format);
818 mode->strftime_fmt = xstrdup(p);
819 } else if (*p)
820 die("unknown date format %s", format);
821 }
822
823 void datestamp(struct strbuf *out)
824 {
825 time_t now;
826 int offset;
827
828 time(&now);
829
830 offset = tm_to_time_t(localtime(&now)) - now;
831 offset /= 60;
832
833 date_string(now, offset, out);
834 }
835
836 /*
837 * Relative time update (eg "2 days ago"). If we haven't set the time
838 * yet, we need to set it from current time.
839 */
840 static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec)
841 {
842 time_t n;
843
844 if (tm->tm_mday < 0)
845 tm->tm_mday = now->tm_mday;
846 if (tm->tm_mon < 0)
847 tm->tm_mon = now->tm_mon;
848 if (tm->tm_year < 0) {
849 tm->tm_year = now->tm_year;
850 if (tm->tm_mon > now->tm_mon)
851 tm->tm_year--;
852 }
853
854 n = mktime(tm) - sec;
855 localtime_r(&n, tm);
856 return n;
857 }
858
859 static void date_now(struct tm *tm, struct tm *now, int *num)
860 {
861 update_tm(tm, now, 0);
862 }
863
864 static void date_yesterday(struct tm *tm, struct tm *now, int *num)
865 {
866 update_tm(tm, now, 24*60*60);
867 }
868
869 static void date_time(struct tm *tm, struct tm *now, int hour)
870 {
871 if (tm->tm_hour < hour)
872 date_yesterday(tm, now, NULL);
873 tm->tm_hour = hour;
874 tm->tm_min = 0;
875 tm->tm_sec = 0;
876 }
877
878 static void date_midnight(struct tm *tm, struct tm *now, int *num)
879 {
880 date_time(tm, now, 0);
881 }
882
883 static void date_noon(struct tm *tm, struct tm *now, int *num)
884 {
885 date_time(tm, now, 12);
886 }
887
888 static void date_tea(struct tm *tm, struct tm *now, int *num)
889 {
890 date_time(tm, now, 17);
891 }
892
893 static void date_pm(struct tm *tm, struct tm *now, int *num)
894 {
895 int hour, n = *num;
896 *num = 0;
897
898 hour = tm->tm_hour;
899 if (n) {
900 hour = n;
901 tm->tm_min = 0;
902 tm->tm_sec = 0;
903 }
904 tm->tm_hour = (hour % 12) + 12;
905 }
906
907 static void date_am(struct tm *tm, struct tm *now, int *num)
908 {
909 int hour, n = *num;
910 *num = 0;
911
912 hour = tm->tm_hour;
913 if (n) {
914 hour = n;
915 tm->tm_min = 0;
916 tm->tm_sec = 0;
917 }
918 tm->tm_hour = (hour % 12);
919 }
920
921 static void date_never(struct tm *tm, struct tm *now, int *num)
922 {
923 time_t n = 0;
924 localtime_r(&n, tm);
925 }
926
927 static const struct special {
928 const char *name;
929 void (*fn)(struct tm *, struct tm *, int *);
930 } special[] = {
931 { "yesterday", date_yesterday },
932 { "noon", date_noon },
933 { "midnight", date_midnight },
934 { "tea", date_tea },
935 { "PM", date_pm },
936 { "AM", date_am },
937 { "never", date_never },
938 { "now", date_now },
939 { NULL }
940 };
941
942 static const char *number_name[] = {
943 "zero", "one", "two", "three", "four",
944 "five", "six", "seven", "eight", "nine", "ten",
945 };
946
947 static const struct typelen {
948 const char *type;
949 int length;
950 } typelen[] = {
951 { "seconds", 1 },
952 { "minutes", 60 },
953 { "hours", 60*60 },
954 { "days", 24*60*60 },
955 { "weeks", 7*24*60*60 },
956 { NULL }
957 };
958
959 static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched)
960 {
961 const struct typelen *tl;
962 const struct special *s;
963 const char *end = date;
964 int i;
965
966 while (isalpha(*++end))
967 ;
968
969 for (i = 0; i < 12; i++) {
970 int match = match_string(date, month_names[i]);
971 if (match >= 3) {
972 tm->tm_mon = i;
973 *touched = 1;
974 return end;
975 }
976 }
977
978 for (s = special; s->name; s++) {
979 int len = strlen(s->name);
980 if (match_string(date, s->name) == len) {
981 s->fn(tm, now, num);
982 *touched = 1;
983 return end;
984 }
985 }
986
987 if (!*num) {
988 for (i = 1; i < 11; i++) {
989 int len = strlen(number_name[i]);
990 if (match_string(date, number_name[i]) == len) {
991 *num = i;
992 *touched = 1;
993 return end;
994 }
995 }
996 if (match_string(date, "last") == 4) {
997 *num = 1;
998 *touched = 1;
999 }
1000 return end;
1001 }
1002
1003 tl = typelen;
1004 while (tl->type) {
1005 int len = strlen(tl->type);
1006 if (match_string(date, tl->type) >= len-1) {
1007 update_tm(tm, now, tl->length * *num);
1008 *num = 0;
1009 *touched = 1;
1010 return end;
1011 }
1012 tl++;
1013 }
1014
1015 for (i = 0; i < 7; i++) {
1016 int match = match_string(date, weekday_names[i]);
1017 if (match >= 3) {
1018 int diff, n = *num -1;
1019 *num = 0;
1020
1021 diff = tm->tm_wday - i;
1022 if (diff <= 0)
1023 n++;
1024 diff += 7*n;
1025
1026 update_tm(tm, now, diff * 24 * 60 * 60);
1027 *touched = 1;
1028 return end;
1029 }
1030 }
1031
1032 if (match_string(date, "months") >= 5) {
1033 int n;
1034 update_tm(tm, now, 0); /* fill in date fields if needed */
1035 n = tm->tm_mon - *num;
1036 *num = 0;
1037 while (n < 0) {
1038 n += 12;
1039 tm->tm_year--;
1040 }
1041 tm->tm_mon = n;
1042 *touched = 1;
1043 return end;
1044 }
1045
1046 if (match_string(date, "years") >= 4) {
1047 update_tm(tm, now, 0); /* fill in date fields if needed */
1048 tm->tm_year -= *num;
1049 *num = 0;
1050 *touched = 1;
1051 return end;
1052 }
1053
1054 return end;
1055 }
1056
1057 static const char *approxidate_digit(const char *date, struct tm *tm, int *num,
1058 time_t now)
1059 {
1060 char *end;
1061 unsigned long number = strtoul(date, &end, 10);
1062
1063 switch (*end) {
1064 case ':':
1065 case '.':
1066 case '/':
1067 case '-':
1068 if (isdigit(end[1])) {
1069 int match = match_multi_number(number, *end, date, end,
1070 tm, now);
1071 if (match)
1072 return date + match;
1073 }
1074 }
1075
1076 /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
1077 if (date[0] != '0' || end - date <= 2)
1078 *num = number;
1079 return end;
1080 }
1081
1082 /*
1083 * Do we have a pending number at the end, or when
1084 * we see a new one? Let's assume it's a month day,
1085 * as in "Dec 6, 1992"
1086 */
1087 static void pending_number(struct tm *tm, int *num)
1088 {
1089 int number = *num;
1090
1091 if (number) {
1092 *num = 0;
1093 if (tm->tm_mday < 0 && number < 32)
1094 tm->tm_mday = number;
1095 else if (tm->tm_mon < 0 && number < 13)
1096 tm->tm_mon = number-1;
1097 else if (tm->tm_year < 0) {
1098 if (number > 1969 && number < 2100)
1099 tm->tm_year = number - 1900;
1100 else if (number > 69 && number < 100)
1101 tm->tm_year = number;
1102 else if (number < 38)
1103 tm->tm_year = 100 + number;
1104 /* We screw up for number = 00 ? */
1105 }
1106 }
1107 }
1108
1109 static unsigned long approxidate_str(const char *date,
1110 const struct timeval *tv,
1111 int *error_ret)
1112 {
1113 int number = 0;
1114 int touched = 0;
1115 struct tm tm, now;
1116 time_t time_sec;
1117
1118 time_sec = tv->tv_sec;
1119 localtime_r(&time_sec, &tm);
1120 now = tm;
1121
1122 tm.tm_year = -1;
1123 tm.tm_mon = -1;
1124 tm.tm_mday = -1;
1125
1126 for (;;) {
1127 unsigned char c = *date;
1128 if (!c)
1129 break;
1130 date++;
1131 if (isdigit(c)) {
1132 pending_number(&tm, &number);
1133 date = approxidate_digit(date-1, &tm, &number, time_sec);
1134 touched = 1;
1135 continue;
1136 }
1137 if (isalpha(c))
1138 date = approxidate_alpha(date-1, &tm, &now, &number, &touched);
1139 }
1140 pending_number(&tm, &number);
1141 if (!touched)
1142 *error_ret = 1;
1143 return update_tm(&tm, &now, 0);
1144 }
1145
1146 unsigned long approxidate_relative(const char *date, const struct timeval *tv)
1147 {
1148 unsigned long timestamp;
1149 int offset;
1150 int errors = 0;
1151
1152 if (!parse_date_basic(date, &timestamp, &offset))
1153 return timestamp;
1154 return approxidate_str(date, tv, &errors);
1155 }
1156
1157 unsigned long approxidate_careful(const char *date, int *error_ret)
1158 {
1159 struct timeval tv;
1160 unsigned long timestamp;
1161 int offset;
1162 int dummy = 0;
1163 if (!error_ret)
1164 error_ret = &dummy;
1165
1166 if (!parse_date_basic(date, &timestamp, &offset)) {
1167 *error_ret = 0;
1168 return timestamp;
1169 }
1170
1171 gettimeofday(&tv, NULL);
1172 return approxidate_str(date, &tv, error_ret);
1173 }
1174
1175 int date_overflows(unsigned long t)
1176 {
1177 time_t sys;
1178
1179 /* If we overflowed our unsigned long, that's bad... */
1180 if (t == ULONG_MAX)
1181 return 1;
1182
1183 /*
1184 * ...but we also are going to feed the result to system
1185 * functions that expect time_t, which is often "signed long".
1186 * Make sure that we fit into time_t, as well.
1187 */
1188 sys = t;
1189 return t != sys || (t < 1) != (sys < 1);
1190 }
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