freshlybakedca.ke
Git fork
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6
7#define DISABLE_SIGN_COMPARE_WARNINGS
8
9#include "git-compat-util.h"
10#include "date.h"
11#include "gettext.h"
12#include "pager.h"
13#include "strbuf.h"
14
15/*
16 * This is like mktime, but without normalization of tm_wday and tm_yday.
17 */
18time_t tm_to_time_t(const struct tm *tm)
19{
20 static const int mdays[] = {
21 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
22 };
23 int year = tm->tm_year - 70;
24 int month = tm->tm_mon;
25 int day = tm->tm_mday;
26
27 if (year < 0 || year > 129) /* algo only works for 1970-2099 */
28 return -1;
29 if (month < 0 || month > 11) /* array bounds */
30 return -1;
31 if (month < 2 || (year + 2) % 4)
32 day--;
33 if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0)
34 return -1;
35 return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
36 tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
37}
38
39static const char *month_names[] = {
40 "January", "February", "March", "April", "May", "June",
41 "July", "August", "September", "October", "November", "December"
42};
43
44static const char *weekday_names[] = {
45 "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
46};
47
48static time_t gm_time_t(timestamp_t time, int tz)
49{
50 int minutes;
51
52 minutes = tz < 0 ? -tz : tz;
53 minutes = (minutes / 100)*60 + (minutes % 100);
54 minutes = tz < 0 ? -minutes : minutes;
55
56 if (minutes > 0) {
57 if (unsigned_add_overflows(time, minutes * 60))
58 die("Timestamp+tz too large: %"PRItime" +%04d",
59 time, tz);
60 } else if (time < -minutes * 60)
61 die("Timestamp before Unix epoch: %"PRItime" %04d", time, tz);
62 time += minutes * 60;
63 if (date_overflows(time))
64 die("Timestamp too large for this system: %"PRItime, time);
65 return (time_t)time;
66}
67
68/*
69 * The "tz" thing is passed in as this strange "decimal parse of tz"
70 * thing, which means that tz -0100 is passed in as the integer -100,
71 * even though it means "sixty minutes off"
72 */
73static struct tm *time_to_tm(timestamp_t time, int tz, struct tm *tm)
74{
75 time_t t = gm_time_t(time, tz);
76 return gmtime_r(&t, tm);
77}
78
79static struct tm *time_to_tm_local(timestamp_t time, struct tm *tm)
80{
81 time_t t = time;
82 return localtime_r(&t, tm);
83}
84
85/*
86 * Fill in the localtime 'struct tm' for the supplied time,
87 * and return the local tz.
88 */
89static int local_time_tzoffset(time_t t, struct tm *tm)
90{
91 time_t t_local;
92 int offset, eastwest;
93
94 localtime_r(&t, tm);
95 t_local = tm_to_time_t(tm);
96 if (t_local == -1)
97 return 0; /* error; just use +0000 */
98 if (t_local < t) {
99 eastwest = -1;
100 offset = t - t_local;
101 } else {
102 eastwest = 1;
103 offset = t_local - t;
104 }
105 offset /= 60; /* in minutes */
106 offset = (offset % 60) + ((offset / 60) * 100);
107 return offset * eastwest;
108}
109
110/*
111 * What value of "tz" was in effect back then at "time" in the
112 * local timezone?
113 */
114static int local_tzoffset(timestamp_t time)
115{
116 struct tm tm;
117
118 if (date_overflows(time))
119 die("Timestamp too large for this system: %"PRItime, time);
120
121 return local_time_tzoffset((time_t)time, &tm);
122}
123
124static void get_time(struct timeval *now)
125{
126 const char *x;
127
128 x = getenv("GIT_TEST_DATE_NOW");
129 if (x) {
130 now->tv_sec = atoi(x);
131 now->tv_usec = 0;
132 }
133 else
134 gettimeofday(now, NULL);
135}
136
137void show_date_relative(timestamp_t time, struct strbuf *timebuf)
138{
139 struct timeval now;
140 timestamp_t diff;
141
142 get_time(&now);
143 if (now.tv_sec < time) {
144 strbuf_addstr(timebuf, _("in the future"));
145 return;
146 }
147 diff = now.tv_sec - time;
148 if (diff < 90) {
149 strbuf_addf(timebuf,
150 Q_("%"PRItime" second ago", "%"PRItime" seconds ago", diff), diff);
151 return;
152 }
153 /* Turn it into minutes */
154 diff = (diff + 30) / 60;
155 if (diff < 90) {
156 strbuf_addf(timebuf,
157 Q_("%"PRItime" minute ago", "%"PRItime" minutes ago", diff), diff);
158 return;
159 }
160 /* Turn it into hours */
161 diff = (diff + 30) / 60;
162 if (diff < 36) {
163 strbuf_addf(timebuf,
164 Q_("%"PRItime" hour ago", "%"PRItime" hours ago", diff), diff);
165 return;
166 }
167 /* We deal with number of days from here on */
168 diff = (diff + 12) / 24;
169 if (diff < 14) {
170 strbuf_addf(timebuf,
171 Q_("%"PRItime" day ago", "%"PRItime" days ago", diff), diff);
172 return;
173 }
174 /* Say weeks for the past 10 weeks or so */
175 if (diff < 70) {
176 strbuf_addf(timebuf,
177 Q_("%"PRItime" week ago", "%"PRItime" weeks ago", (diff + 3) / 7),
178 (diff + 3) / 7);
179 return;
180 }
181 /* Say months for the past 12 months or so */
182 if (diff < 365) {
183 strbuf_addf(timebuf,
184 Q_("%"PRItime" month ago", "%"PRItime" months ago", (diff + 15) / 30),
185 (diff + 15) / 30);
186 return;
187 }
188 /* Give years and months for 5 years or so */
189 if (diff < 1825) {
190 timestamp_t totalmonths = (diff * 12 * 2 + 365) / (365 * 2);
191 timestamp_t years = totalmonths / 12;
192 timestamp_t months = totalmonths % 12;
193 if (months) {
194 struct strbuf sb = STRBUF_INIT;
195 strbuf_addf(&sb, Q_("%"PRItime" year", "%"PRItime" years", years), years);
196 strbuf_addf(timebuf,
197 /* TRANSLATORS: "%s" is "<n> years" */
198 Q_("%s, %"PRItime" month ago", "%s, %"PRItime" months ago", months),
199 sb.buf, months);
200 strbuf_release(&sb);
201 } else
202 strbuf_addf(timebuf,
203 Q_("%"PRItime" year ago", "%"PRItime" years ago", years), years);
204 return;
205 }
206 /* Otherwise, just years. Centuries is probably overkill. */
207 strbuf_addf(timebuf,
208 Q_("%"PRItime" year ago", "%"PRItime" years ago", (diff + 183) / 365),
209 (diff + 183) / 365);
210}
211
212struct date_mode date_mode_from_type(enum date_mode_type type)
213{
214 struct date_mode mode = DATE_MODE_INIT;
215 if (type == DATE_STRFTIME)
216 BUG("cannot create anonymous strftime date_mode struct");
217 mode.type = type;
218 return mode;
219}
220
221static void show_date_normal(struct strbuf *buf, timestamp_t time, struct tm *tm, int tz, struct tm *human_tm, int human_tz, int local)
222{
223 struct {
224 unsigned int year:1,
225 date:1,
226 wday:1,
227 time:1,
228 seconds:1,
229 tz:1;
230 } hide = { 0 };
231
232 hide.tz = local || tz == human_tz;
233 hide.year = tm->tm_year == human_tm->tm_year;
234 if (hide.year) {
235 if (tm->tm_mon == human_tm->tm_mon) {
236 if (tm->tm_mday > human_tm->tm_mday) {
237 /* Future date: think timezones */
238 } else if (tm->tm_mday == human_tm->tm_mday) {
239 hide.date = hide.wday = 1;
240 } else if (tm->tm_mday + 5 > human_tm->tm_mday) {
241 /* Leave just weekday if it was a few days ago */
242 hide.date = 1;
243 }
244 }
245 }
246
247 /* Show "today" times as just relative times */
248 if (hide.wday) {
249 show_date_relative(time, buf);
250 return;
251 }
252
253 /*
254 * Always hide seconds for human-readable.
255 * Hide timezone if showing date.
256 * Hide weekday and time if showing year.
257 *
258 * The logic here is two-fold:
259 * (a) only show details when recent enough to matter
260 * (b) keep the maximum length "similar", and in check
261 */
262 if (human_tm->tm_year) {
263 hide.seconds = 1;
264 hide.tz |= !hide.date;
265 hide.wday = hide.time = !hide.year;
266 }
267
268 if (!hide.wday)
269 strbuf_addf(buf, "%.3s ", weekday_names[tm->tm_wday]);
270 if (!hide.date)
271 strbuf_addf(buf, "%.3s %d ", month_names[tm->tm_mon], tm->tm_mday);
272
273 /* Do we want AM/PM depending on locale? */
274 if (!hide.time) {
275 strbuf_addf(buf, "%02d:%02d", tm->tm_hour, tm->tm_min);
276 if (!hide.seconds)
277 strbuf_addf(buf, ":%02d", tm->tm_sec);
278 } else
279 strbuf_rtrim(buf);
280
281 if (!hide.year)
282 strbuf_addf(buf, " %d", tm->tm_year + 1900);
283
284 if (!hide.tz)
285 strbuf_addf(buf, " %+05d", tz);
286}
287
288const char *show_date(timestamp_t time, int tz, struct date_mode mode)
289{
290 struct tm *tm;
291 struct tm tmbuf = { 0 };
292 struct tm human_tm = { 0 };
293 int human_tz = -1;
294 static struct strbuf timebuf = STRBUF_INIT;
295
296 if (mode.type == DATE_UNIX) {
297 strbuf_reset(&timebuf);
298 strbuf_addf(&timebuf, "%"PRItime, time);
299 return timebuf.buf;
300 }
301
302 if (mode.type == DATE_HUMAN) {
303 struct timeval now;
304
305 get_time(&now);
306
307 /* Fill in the data for "current time" in human_tz and human_tm */
308 human_tz = local_time_tzoffset(now.tv_sec, &human_tm);
309 }
310
311 if (mode.local)
312 tz = local_tzoffset(time);
313
314 if (mode.type == DATE_RAW) {
315 strbuf_reset(&timebuf);
316 strbuf_addf(&timebuf, "%"PRItime" %+05d", time, tz);
317 return timebuf.buf;
318 }
319
320 if (mode.type == DATE_RELATIVE) {
321 strbuf_reset(&timebuf);
322 show_date_relative(time, &timebuf);
323 return timebuf.buf;
324 }
325
326 if (mode.local)
327 tm = time_to_tm_local(time, &tmbuf);
328 else
329 tm = time_to_tm(time, tz, &tmbuf);
330 if (!tm) {
331 tm = time_to_tm(0, 0, &tmbuf);
332 tz = 0;
333 }
334
335 strbuf_reset(&timebuf);
336 if (mode.type == DATE_SHORT)
337 strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
338 tm->tm_mon + 1, tm->tm_mday);
339 else if (mode.type == DATE_ISO8601)
340 strbuf_addf(&timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
341 tm->tm_year + 1900,
342 tm->tm_mon + 1,
343 tm->tm_mday,
344 tm->tm_hour, tm->tm_min, tm->tm_sec,
345 tz);
346 else if (mode.type == DATE_ISO8601_STRICT) {
347 strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d:%02d:%02d",
348 tm->tm_year + 1900,
349 tm->tm_mon + 1,
350 tm->tm_mday,
351 tm->tm_hour, tm->tm_min, tm->tm_sec);
352 if (tz == 0) {
353 strbuf_addch(&timebuf, 'Z');
354 } else {
355 strbuf_addch(&timebuf, tz >= 0 ? '+' : '-');
356 tz = abs(tz);
357 strbuf_addf(&timebuf, "%02d:%02d", tz / 100, tz % 100);
358 }
359 } else if (mode.type == DATE_RFC2822)
360 strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
361 weekday_names[tm->tm_wday], tm->tm_mday,
362 month_names[tm->tm_mon], tm->tm_year + 1900,
363 tm->tm_hour, tm->tm_min, tm->tm_sec, tz);
364 else if (mode.type == DATE_STRFTIME)
365 strbuf_addftime(&timebuf, mode.strftime_fmt, tm, tz,
366 !mode.local);
367 else
368 show_date_normal(&timebuf, time, tm, tz, &human_tm, human_tz, mode.local);
369 return timebuf.buf;
370}
371
372/*
373 * Check these. And note how it doesn't do the summer-time conversion.
374 *
375 * In my world, it's always summer, and things are probably a bit off
376 * in other ways too.
377 */
378static const struct {
379 const char *name;
380 int offset;
381 int dst;
382} timezone_names[] = {
383 { "IDLW", -12, 0, }, /* International Date Line West */
384 { "NT", -11, 0, }, /* Nome */
385 { "CAT", -10, 0, }, /* Central Alaska */
386 { "HST", -10, 0, }, /* Hawaii Standard */
387 { "HDT", -10, 1, }, /* Hawaii Daylight */
388 { "YST", -9, 0, }, /* Yukon Standard */
389 { "YDT", -9, 1, }, /* Yukon Daylight */
390 { "PST", -8, 0, }, /* Pacific Standard */
391 { "PDT", -8, 1, }, /* Pacific Daylight */
392 { "MST", -7, 0, }, /* Mountain Standard */
393 { "MDT", -7, 1, }, /* Mountain Daylight */
394 { "CST", -6, 0, }, /* Central Standard */
395 { "CDT", -6, 1, }, /* Central Daylight */
396 { "EST", -5, 0, }, /* Eastern Standard */
397 { "EDT", -5, 1, }, /* Eastern Daylight */
398 { "AST", -3, 0, }, /* Atlantic Standard */
399 { "ADT", -3, 1, }, /* Atlantic Daylight */
400 { "WAT", -1, 0, }, /* West Africa */
401
402 { "GMT", 0, 0, }, /* Greenwich Mean */
403 { "UTC", 0, 0, }, /* Universal (Coordinated) */
404 { "Z", 0, 0, }, /* Zulu, alias for UTC */
405
406 { "WET", 0, 0, }, /* Western European */
407 { "BST", 0, 1, }, /* British Summer */
408 { "CET", +1, 0, }, /* Central European */
409 { "MET", +1, 0, }, /* Middle European */
410 { "MEWT", +1, 0, }, /* Middle European Winter */
411 { "MEST", +1, 1, }, /* Middle European Summer */
412 { "CEST", +1, 1, }, /* Central European Summer */
413 { "MESZ", +1, 1, }, /* Middle European Summer */
414 { "FWT", +1, 0, }, /* French Winter */
415 { "FST", +1, 1, }, /* French Summer */
416 { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
417 { "EEST", +2, 1, }, /* Eastern European Daylight */
418 { "WAST", +7, 0, }, /* West Australian Standard */
419 { "WADT", +7, 1, }, /* West Australian Daylight */
420 { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
421 { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
422 { "EAST", +10, 0, }, /* Eastern Australian Standard */
423 { "EADT", +10, 1, }, /* Eastern Australian Daylight */
424 { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
425 { "NZT", +12, 0, }, /* New Zealand */
426 { "NZST", +12, 0, }, /* New Zealand Standard */
427 { "NZDT", +12, 1, }, /* New Zealand Daylight */
428 { "IDLE", +12, 0, }, /* International Date Line East */
429};
430
431static int match_string(const char *date, const char *str)
432{
433 int i = 0;
434
435 for (i = 0; *date; date++, str++, i++) {
436 if (*date == *str)
437 continue;
438 if (toupper(*date) == toupper(*str))
439 continue;
440 if (!isalnum(*date))
441 break;
442 return 0;
443 }
444 return i;
445}
446
447static int skip_alpha(const char *date)
448{
449 int i = 0;
450 do {
451 i++;
452 } while (isalpha(date[i]));
453 return i;
454}
455
456/*
457* Parse month, weekday, or timezone name
458*/
459static int match_alpha(const char *date, struct tm *tm, int *offset)
460{
461 int i;
462
463 for (i = 0; i < 12; i++) {
464 int match = match_string(date, month_names[i]);
465 if (match >= 3) {
466 tm->tm_mon = i;
467 return match;
468 }
469 }
470
471 for (i = 0; i < 7; i++) {
472 int match = match_string(date, weekday_names[i]);
473 if (match >= 3) {
474 tm->tm_wday = i;
475 return match;
476 }
477 }
478
479 for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
480 int match = match_string(date, timezone_names[i].name);
481 if (match >= 3 || match == strlen(timezone_names[i].name)) {
482 int off = timezone_names[i].offset;
483
484 /* This is bogus, but we like summer */
485 off += timezone_names[i].dst;
486
487 /* Only use the tz name offset if we don't have anything better */
488 if (*offset == -1)
489 *offset = 60*off;
490
491 return match;
492 }
493 }
494
495 if (match_string(date, "PM") == 2) {
496 tm->tm_hour = (tm->tm_hour % 12) + 12;
497 return 2;
498 }
499
500 if (match_string(date, "AM") == 2) {
501 tm->tm_hour = (tm->tm_hour % 12) + 0;
502 return 2;
503 }
504
505 /* ISO-8601 allows yyyymmDD'T'HHMMSS, with less precision */
506 if (*date == 'T' && isdigit(date[1]) && tm->tm_hour == -1) {
507 tm->tm_min = tm->tm_sec = 0;
508 return 1;
509 }
510
511 /* BAD CRAP */
512 return skip_alpha(date);
513}
514
515static int set_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
516{
517 if (month > 0 && month < 13 && day > 0 && day < 32) {
518 struct tm check = *tm;
519 struct tm *r = (now_tm ? &check : tm);
520 time_t specified;
521
522 r->tm_mon = month - 1;
523 r->tm_mday = day;
524 if (year == -1) {
525 if (!now_tm)
526 return 1;
527 r->tm_year = now_tm->tm_year;
528 }
529 else if (year >= 1970 && year < 2100)
530 r->tm_year = year - 1900;
531 else if (year > 70 && year < 100)
532 r->tm_year = year;
533 else if (year < 38)
534 r->tm_year = year + 100;
535 else
536 return -1;
537 if (!now_tm)
538 return 0;
539
540 specified = tm_to_time_t(r);
541
542 /* Be it commit time or author time, it does not make
543 * sense to specify timestamp way into the future. Make
544 * sure it is not later than ten days from now...
545 */
546 if ((specified != -1) && (now + 10*24*3600 < specified))
547 return -1;
548 tm->tm_mon = r->tm_mon;
549 tm->tm_mday = r->tm_mday;
550 if (year != -1)
551 tm->tm_year = r->tm_year;
552 return 0;
553 }
554 return -1;
555}
556
557static int set_time(long hour, long minute, long second, struct tm *tm)
558{
559 /* We accept 61st second because of leap second */
560 if (0 <= hour && hour <= 24 &&
561 0 <= minute && minute < 60 &&
562 0 <= second && second <= 60) {
563 tm->tm_hour = hour;
564 tm->tm_min = minute;
565 tm->tm_sec = second;
566 return 0;
567 }
568 return -1;
569}
570
571static int is_date_known(struct tm *tm)
572{
573 return tm->tm_year != -1 && tm->tm_mon != -1 && tm->tm_mday != -1;
574}
575
576static int match_multi_number(timestamp_t num, char c, const char *date,
577 char *end, struct tm *tm, time_t now)
578{
579 struct tm now_tm;
580 struct tm *refuse_future;
581 long num2, num3;
582
583 num2 = strtol(end+1, &end, 10);
584 num3 = -1;
585 if (*end == c && isdigit(end[1]))
586 num3 = strtol(end+1, &end, 10);
587
588 /* Time? Date? */
589 switch (c) {
590 case ':':
591 if (num3 < 0)
592 num3 = 0;
593 if (set_time(num, num2, num3, tm) == 0) {
594 /*
595 * If %H:%M:%S was just parsed followed by: .<num4>
596 * Consider (& discard) it as fractional second
597 * if %Y%m%d is parsed before.
598 */
599 if (*end == '.' && isdigit(end[1]) && is_date_known(tm))
600 strtol(end + 1, &end, 10);
601 break;
602 }
603 return 0;
604
605 case '-':
606 case '/':
607 case '.':
608 if (!now)
609 now = time(NULL);
610 refuse_future = NULL;
611 if (gmtime_r(&now, &now_tm))
612 refuse_future = &now_tm;
613
614 if (num > 70) {
615 /* yyyy-mm-dd? */
616 if (set_date(num, num2, num3, NULL, now, tm) == 0)
617 break;
618 /* yyyy-dd-mm? */
619 if (set_date(num, num3, num2, NULL, now, tm) == 0)
620 break;
621 }
622 /* Our eastern European friends say dd.mm.yy[yy]
623 * is the norm there, so giving precedence to
624 * mm/dd/yy[yy] form only when separator is not '.'
625 */
626 if (c != '.' &&
627 set_date(num3, num, num2, refuse_future, now, tm) == 0)
628 break;
629 /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
630 if (set_date(num3, num2, num, refuse_future, now, tm) == 0)
631 break;
632 /* Funny European mm.dd.yy */
633 if (c == '.' &&
634 set_date(num3, num, num2, refuse_future, now, tm) == 0)
635 break;
636 return 0;
637 }
638 return end - date;
639}
640
641/*
642 * Have we filled in any part of the time/date yet?
643 * We just do a binary 'and' to see if the sign bit
644 * is set in all the values.
645 */
646static inline int nodate(struct tm *tm)
647{
648 return (tm->tm_year &
649 tm->tm_mon &
650 tm->tm_mday &
651 tm->tm_hour &
652 tm->tm_min &
653 tm->tm_sec) < 0;
654}
655
656/*
657 * Have we seen an ISO-8601-alike date, i.e. 20220101T0,
658 * In which, hour is still unset,
659 * and minutes and second has been set to 0.
660 */
661static inline int maybeiso8601(struct tm *tm)
662{
663 return tm->tm_hour == -1 &&
664 tm->tm_min == 0 &&
665 tm->tm_sec == 0;
666}
667
668/*
669 * We've seen a digit. Time? Year? Date?
670 */
671static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
672{
673 int n;
674 char *end;
675 timestamp_t num;
676
677 num = parse_timestamp(date, &end, 10);
678
679 /*
680 * Seconds since 1970? We trigger on that for any numbers with
681 * more than 8 digits. This is because we don't want to rule out
682 * numbers like 20070606 as a YYYYMMDD date.
683 */
684 if (num >= 100000000 && nodate(tm)) {
685 time_t time = num;
686 if (gmtime_r(&time, tm)) {
687 *tm_gmt = 1;
688 return end - date;
689 }
690 }
691
692 /*
693 * Check for special formats: num[-.:/]num[same]num
694 */
695 switch (*end) {
696 case ':':
697 case '.':
698 case '/':
699 case '-':
700 if (isdigit(end[1])) {
701 int match = match_multi_number(num, *end, date, end, tm, 0);
702 if (match)
703 return match;
704 }
705 }
706
707 /*
708 * None of the special formats? Try to guess what
709 * the number meant. We use the number of digits
710 * to make a more educated guess..
711 */
712 n = 0;
713 do {
714 n++;
715 } while (isdigit(date[n]));
716
717 /* 8 digits, compact style of ISO-8601's date: YYYYmmDD */
718 /* 6 digits, compact style of ISO-8601's time: HHMMSS */
719 if (n == 8 || n == 6) {
720 unsigned int num1 = num / 10000;
721 unsigned int num2 = (num % 10000) / 100;
722 unsigned int num3 = num % 100;
723 if (n == 8)
724 set_date(num1, num2, num3, NULL, time(NULL), tm);
725 else if (n == 6 && set_time(num1, num2, num3, tm) == 0 &&
726 *end == '.' && isdigit(end[1]))
727 strtoul(end + 1, &end, 10);
728 return end - date;
729 }
730
731 /* reduced precision of ISO-8601's time: HHMM or HH */
732 if (maybeiso8601(tm)) {
733 unsigned int num1 = num;
734 unsigned int num2 = 0;
735 if (n == 4) {
736 num1 = num / 100;
737 num2 = num % 100;
738 }
739 if ((n == 4 || n == 2) && !nodate(tm) &&
740 set_time(num1, num2, 0, tm) == 0)
741 return n;
742 /*
743 * We thought this is an ISO-8601 time string,
744 * we set minutes and seconds to 0,
745 * turn out it isn't, rollback the change.
746 */
747 tm->tm_min = tm->tm_sec = -1;
748 }
749
750 /* Four-digit year or a timezone? */
751 if (n == 4) {
752 if (num <= 1400 && *offset == -1) {
753 unsigned int minutes = num % 100;
754 unsigned int hours = num / 100;
755 *offset = hours*60 + minutes;
756 } else if (num > 1900 && num < 2100)
757 tm->tm_year = num - 1900;
758 return n;
759 }
760
761 /*
762 * Ignore lots of numerals. We took care of 4-digit years above.
763 * Days or months must be one or two digits.
764 */
765 if (n > 2)
766 return n;
767
768 /*
769 * NOTE! We will give precedence to day-of-month over month or
770 * year numbers in the 1-12 range. So 05 is always "mday 5",
771 * unless we already have a mday..
772 *
773 * IOW, 01 Apr 05 parses as "April 1st, 2005".
774 */
775 if (num > 0 && num < 32 && tm->tm_mday < 0) {
776 tm->tm_mday = num;
777 return n;
778 }
779
780 /* Two-digit year? */
781 if (n == 2 && tm->tm_year < 0) {
782 if (num < 10 && tm->tm_mday >= 0) {
783 tm->tm_year = num + 100;
784 return n;
785 }
786 if (num >= 70) {
787 tm->tm_year = num;
788 return n;
789 }
790 }
791
792 if (num > 0 && num < 13 && tm->tm_mon < 0)
793 tm->tm_mon = num-1;
794
795 return n;
796}
797
798static int match_tz(const char *date, int *offp)
799{
800 char *end;
801 int hour = strtoul(date + 1, &end, 10);
802 int n = end - (date + 1);
803 int min = 0;
804
805 if (n == 4) {
806 /* hhmm */
807 min = hour % 100;
808 hour = hour / 100;
809 } else if (n != 2) {
810 min = 99; /* random crap */
811 } else if (*end == ':') {
812 /* hh:mm? */
813 min = strtoul(end + 1, &end, 10);
814 if (end - (date + 1) != 5)
815 min = 99; /* random crap */
816 } /* otherwise we parsed "hh" */
817
818 /*
819 * Don't accept any random crap. Even though some places have
820 * offset larger than 12 hours (e.g. Pacific/Kiritimati is at
821 * UTC+14), there is something wrong if hour part is much
822 * larger than that. We might also want to check that the
823 * minutes are divisible by 15 or something too. (Offset of
824 * Kathmandu, Nepal is UTC+5:45)
825 */
826 if (min < 60 && hour < 24) {
827 int offset = hour * 60 + min;
828 if (*date == '-')
829 offset = -offset;
830 *offp = offset;
831 }
832 return end - date;
833}
834
835static void date_string(timestamp_t date, int offset, struct strbuf *buf)
836{
837 int sign = '+';
838
839 if (offset < 0) {
840 offset = -offset;
841 sign = '-';
842 }
843 strbuf_addf(buf, "%"PRItime" %c%02d%02d", date, sign, offset / 60, offset % 60);
844}
845
846/*
847 * Parse a string like "0 +0000" as ancient timestamp near epoch, but
848 * only when it appears not as part of any other string.
849 */
850static int match_object_header_date(const char *date, timestamp_t *timestamp, int *offset)
851{
852 char *end;
853 timestamp_t stamp;
854 int ofs;
855
856 if (*date < '0' || '9' < *date)
857 return -1;
858 stamp = parse_timestamp(date, &end, 10);
859 if (*end != ' ' || stamp == TIME_MAX || (end[1] != '+' && end[1] != '-'))
860 return -1;
861 date = end + 2;
862 ofs = strtol(date, &end, 10);
863 if ((*end != '\0' && (*end != '\n')) || end != date + 4)
864 return -1;
865 ofs = (ofs / 100) * 60 + (ofs % 100);
866 if (date[-1] == '-')
867 ofs = -ofs;
868 *timestamp = stamp;
869 *offset = ofs;
870 return 0;
871}
872
873
874/* timestamp of 2099-12-31T23:59:59Z, including 32 leap days */
875static const timestamp_t timestamp_max = (((timestamp_t)2100 - 1970) * 365 + 32) * 24 * 60 * 60 - 1;
876
877/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
878 (i.e. English) day/month names, and it doesn't work correctly with %z. */
879int parse_date_basic(const char *date, timestamp_t *timestamp, int *offset)
880{
881 struct tm tm;
882 int tm_gmt;
883 timestamp_t dummy_timestamp;
884 int dummy_offset;
885
886 if (!timestamp)
887 timestamp = &dummy_timestamp;
888 if (!offset)
889 offset = &dummy_offset;
890
891 memset(&tm, 0, sizeof(tm));
892 tm.tm_year = -1;
893 tm.tm_mon = -1;
894 tm.tm_mday = -1;
895 tm.tm_isdst = -1;
896 tm.tm_hour = -1;
897 tm.tm_min = -1;
898 tm.tm_sec = -1;
899 *offset = -1;
900 tm_gmt = 0;
901
902 if (*date == '@' &&
903 !match_object_header_date(date + 1, timestamp, offset))
904 return 0; /* success */
905 for (;;) {
906 int match = 0;
907 unsigned char c = *date;
908
909 /* Stop at end of string or newline */
910 if (!c || c == '\n')
911 break;
912
913 if (isalpha(c))
914 match = match_alpha(date, &tm, offset);
915 else if (isdigit(c))
916 match = match_digit(date, &tm, offset, &tm_gmt);
917 else if ((c == '-' || c == '+') && isdigit(date[1]))
918 match = match_tz(date, offset);
919
920 if (!match) {
921 /* BAD CRAP */
922 match = 1;
923 }
924
925 date += match;
926 }
927
928 /* do not use mktime(), which uses local timezone, here */
929 *timestamp = tm_to_time_t(&tm);
930 if (*timestamp == -1)
931 return -1;
932
933 if (*offset == -1) {
934 time_t temp_time;
935
936 /* gmtime_r() in match_digit() may have clobbered it */
937 tm.tm_isdst = -1;
938 temp_time = mktime(&tm);
939 if ((time_t)*timestamp > temp_time) {
940 *offset = ((time_t)*timestamp - temp_time) / 60;
941 } else {
942 *offset = -(int)((temp_time - (time_t)*timestamp) / 60);
943 }
944 }
945
946 if (!tm_gmt) {
947 if (*offset > 0 && *offset * 60 > *timestamp)
948 return -1;
949 if (*offset < 0 && -*offset * 60 > timestamp_max - *timestamp)
950 return -1;
951 *timestamp -= *offset * 60;
952 }
953
954 return 0; /* success */
955}
956
957int parse_expiry_date(const char *date, timestamp_t *timestamp)
958{
959 int errors = 0;
960
961 if (!strcmp(date, "never") || !strcmp(date, "false"))
962 *timestamp = 0;
963 else if (!strcmp(date, "all") || !strcmp(date, "now"))
964 /*
965 * We take over "now" here, which usually translates
966 * to the current timestamp. This is because the user
967 * really means to expire everything that was done in
968 * the past, and by definition reflogs are the record
969 * of the past, and there is nothing from the future
970 * to be kept.
971 */
972 *timestamp = TIME_MAX;
973 else
974 *timestamp = approxidate_careful(date, &errors);
975
976 return errors;
977}
978
979int parse_date(const char *date, struct strbuf *result)
980{
981 timestamp_t timestamp;
982 int offset;
983 if (parse_date_basic(date, ×tamp, &offset))
984 return -1;
985 date_string(timestamp, offset, result);
986 return 0;
987}
988
989static enum date_mode_type parse_date_type(const char *format, const char **end)
990{
991 if (skip_prefix(format, "relative", end))
992 return DATE_RELATIVE;
993 if (skip_prefix(format, "iso8601-strict", end) ||
994 skip_prefix(format, "iso-strict", end))
995 return DATE_ISO8601_STRICT;
996 if (skip_prefix(format, "iso8601", end) ||
997 skip_prefix(format, "iso", end))
998 return DATE_ISO8601;
999 if (skip_prefix(format, "rfc2822", end) ||
1000 skip_prefix(format, "rfc", end))
1001 return DATE_RFC2822;
1002 if (skip_prefix(format, "short", end))
1003 return DATE_SHORT;
1004 if (skip_prefix(format, "default", end))
1005 return DATE_NORMAL;
1006 if (skip_prefix(format, "human", end))
1007 return DATE_HUMAN;
1008 if (skip_prefix(format, "raw", end))
1009 return DATE_RAW;
1010 if (skip_prefix(format, "unix", end))
1011 return DATE_UNIX;
1012 if (skip_prefix(format, "format", end))
1013 return DATE_STRFTIME;
1014 /*
1015 * Please update $__git_log_date_formats in
1016 * git-completion.bash when you add new formats.
1017 */
1018
1019 die("unknown date format %s", format);
1020}
1021
1022void parse_date_format(const char *format, struct date_mode *mode)
1023{
1024 const char *p;
1025
1026 /* "auto:foo" is "if tty/pager, then foo, otherwise normal" */
1027 if (skip_prefix(format, "auto:", &p)) {
1028 if (isatty(1) || pager_in_use())
1029 format = p;
1030 else
1031 format = "default";
1032 }
1033
1034 /* historical alias */
1035 if (!strcmp(format, "local"))
1036 format = "default-local";
1037
1038 mode->type = parse_date_type(format, &p);
1039 mode->local = 0;
1040
1041 if (skip_prefix(p, "-local", &p))
1042 mode->local = 1;
1043
1044 if (mode->type == DATE_STRFTIME) {
1045 if (!skip_prefix(p, ":", &p))
1046 die("date format missing colon separator: %s", format);
1047 mode->strftime_fmt = xstrdup(p);
1048 } else if (*p)
1049 die("unknown date format %s", format);
1050}
1051
1052void date_mode_release(struct date_mode *mode)
1053{
1054 free((char *)mode->strftime_fmt);
1055}
1056
1057void datestamp(struct strbuf *out)
1058{
1059 time_t now;
1060 int offset;
1061 struct tm tm = { 0 };
1062
1063 time(&now);
1064
1065 offset = tm_to_time_t(localtime_r(&now, &tm)) - now;
1066 offset /= 60;
1067
1068 date_string(now, offset, out);
1069}
1070
1071/*
1072 * Relative time update (eg "2 days ago"). If we haven't set the time
1073 * yet, we need to set it from current time.
1074 */
1075static time_t update_tm(struct tm *tm, struct tm *now, time_t sec)
1076{
1077 time_t n;
1078
1079 if (tm->tm_mday < 0)
1080 tm->tm_mday = now->tm_mday;
1081 if (tm->tm_mon < 0)
1082 tm->tm_mon = now->tm_mon;
1083 if (tm->tm_year < 0) {
1084 tm->tm_year = now->tm_year;
1085 if (tm->tm_mon > now->tm_mon)
1086 tm->tm_year--;
1087 }
1088
1089 n = mktime(tm) - sec;
1090 localtime_r(&n, tm);
1091 return n;
1092}
1093
1094/*
1095 * Do we have a pending number at the end, or when
1096 * we see a new one? Let's assume it's a month day,
1097 * as in "Dec 6, 1992"
1098 */
1099static void pending_number(struct tm *tm, int *num)
1100{
1101 int number = *num;
1102
1103 if (number) {
1104 *num = 0;
1105 if (tm->tm_mday < 0 && number < 32)
1106 tm->tm_mday = number;
1107 else if (tm->tm_mon < 0 && number < 13)
1108 tm->tm_mon = number-1;
1109 else if (tm->tm_year < 0) {
1110 if (number > 1969 && number < 2100)
1111 tm->tm_year = number - 1900;
1112 else if (number > 69 && number < 100)
1113 tm->tm_year = number;
1114 else if (number < 38)
1115 tm->tm_year = 100 + number;
1116 /* We screw up for number = 00 ? */
1117 }
1118 }
1119}
1120
1121static void date_now(struct tm *tm, struct tm *now, int *num)
1122{
1123 *num = 0;
1124 update_tm(tm, now, 0);
1125}
1126
1127static void date_yesterday(struct tm *tm, struct tm *now, int *num)
1128{
1129 *num = 0;
1130 update_tm(tm, now, 24*60*60);
1131}
1132
1133static void date_time(struct tm *tm, struct tm *now, int hour)
1134{
1135 if (tm->tm_hour < hour)
1136 update_tm(tm, now, 24*60*60);
1137 tm->tm_hour = hour;
1138 tm->tm_min = 0;
1139 tm->tm_sec = 0;
1140}
1141
1142static void date_midnight(struct tm *tm, struct tm *now, int *num)
1143{
1144 pending_number(tm, num);
1145 date_time(tm, now, 0);
1146}
1147
1148static void date_noon(struct tm *tm, struct tm *now, int *num)
1149{
1150 pending_number(tm, num);
1151 date_time(tm, now, 12);
1152}
1153
1154static void date_tea(struct tm *tm, struct tm *now, int *num)
1155{
1156 pending_number(tm, num);
1157 date_time(tm, now, 17);
1158}
1159
1160static void date_pm(struct tm *tm, struct tm *now UNUSED, int *num)
1161{
1162 int hour, n = *num;
1163 *num = 0;
1164
1165 hour = tm->tm_hour;
1166 if (n) {
1167 hour = n;
1168 tm->tm_min = 0;
1169 tm->tm_sec = 0;
1170 }
1171 tm->tm_hour = (hour % 12) + 12;
1172}
1173
1174static void date_am(struct tm *tm, struct tm *now UNUSED, int *num)
1175{
1176 int hour, n = *num;
1177 *num = 0;
1178
1179 hour = tm->tm_hour;
1180 if (n) {
1181 hour = n;
1182 tm->tm_min = 0;
1183 tm->tm_sec = 0;
1184 }
1185 tm->tm_hour = (hour % 12);
1186}
1187
1188static void date_never(struct tm *tm, struct tm *now UNUSED, int *num)
1189{
1190 time_t n = 0;
1191 localtime_r(&n, tm);
1192 *num = 0;
1193}
1194
1195static const struct special {
1196 const char *name;
1197 void (*fn)(struct tm *, struct tm *, int *);
1198} special[] = {
1199 { "yesterday", date_yesterday },
1200 { "noon", date_noon },
1201 { "midnight", date_midnight },
1202 { "tea", date_tea },
1203 { "PM", date_pm },
1204 { "AM", date_am },
1205 { "never", date_never },
1206 { "now", date_now },
1207 { NULL }
1208};
1209
1210static const char *number_name[] = {
1211 "zero", "one", "two", "three", "four",
1212 "five", "six", "seven", "eight", "nine", "ten",
1213};
1214
1215static const struct typelen {
1216 const char *type;
1217 int length;
1218} typelen[] = {
1219 { "seconds", 1 },
1220 { "minutes", 60 },
1221 { "hours", 60*60 },
1222 { "days", 24*60*60 },
1223 { "weeks", 7*24*60*60 },
1224 { NULL }
1225};
1226
1227static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched)
1228{
1229 const struct typelen *tl;
1230 const struct special *s;
1231 const char *end = date;
1232 int i;
1233
1234 while (isalpha(*++end))
1235 ;
1236
1237 for (i = 0; i < 12; i++) {
1238 int match = match_string(date, month_names[i]);
1239 if (match >= 3) {
1240 tm->tm_mon = i;
1241 *touched = 1;
1242 return end;
1243 }
1244 }
1245
1246 for (s = special; s->name; s++) {
1247 size_t len = strlen(s->name);
1248 if (match_string(date, s->name) == len) {
1249 s->fn(tm, now, num);
1250 *touched = 1;
1251 return end;
1252 }
1253 }
1254
1255 if (!*num) {
1256 for (i = 1; i < 11; i++) {
1257 size_t len = strlen(number_name[i]);
1258 if (match_string(date, number_name[i]) == len) {
1259 *num = i;
1260 *touched = 1;
1261 return end;
1262 }
1263 }
1264 if (match_string(date, "last") == 4) {
1265 *num = 1;
1266 *touched = 1;
1267 }
1268 return end;
1269 }
1270
1271 tl = typelen;
1272 while (tl->type) {
1273 size_t len = strlen(tl->type);
1274 if (match_string(date, tl->type) >= len-1) {
1275 update_tm(tm, now, tl->length * *num);
1276 *num = 0;
1277 *touched = 1;
1278 return end;
1279 }
1280 tl++;
1281 }
1282
1283 for (i = 0; i < 7; i++) {
1284 int match = match_string(date, weekday_names[i]);
1285 if (match >= 3) {
1286 int diff, n = *num -1;
1287 *num = 0;
1288
1289 diff = tm->tm_wday - i;
1290 if (diff <= 0)
1291 n++;
1292 diff += 7*n;
1293
1294 update_tm(tm, now, diff * 24 * 60 * 60);
1295 *touched = 1;
1296 return end;
1297 }
1298 }
1299
1300 if (match_string(date, "months") >= 5) {
1301 int n;
1302 update_tm(tm, now, 0); /* fill in date fields if needed */
1303 n = tm->tm_mon - *num;
1304 *num = 0;
1305 while (n < 0) {
1306 n += 12;
1307 tm->tm_year--;
1308 }
1309 tm->tm_mon = n;
1310 *touched = 1;
1311 return end;
1312 }
1313
1314 if (match_string(date, "years") >= 4) {
1315 update_tm(tm, now, 0); /* fill in date fields if needed */
1316 tm->tm_year -= *num;
1317 *num = 0;
1318 *touched = 1;
1319 return end;
1320 }
1321
1322 return end;
1323}
1324
1325static const char *approxidate_digit(const char *date, struct tm *tm, int *num,
1326 time_t now)
1327{
1328 char *end;
1329 timestamp_t number = parse_timestamp(date, &end, 10);
1330
1331 switch (*end) {
1332 case ':':
1333 case '.':
1334 case '/':
1335 case '-':
1336 if (isdigit(end[1])) {
1337 int match = match_multi_number(number, *end, date, end,
1338 tm, now);
1339 if (match)
1340 return date + match;
1341 }
1342 }
1343
1344 /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
1345 if (date[0] != '0' || end - date <= 2)
1346 *num = number;
1347 return end;
1348}
1349
1350static timestamp_t approxidate_str(const char *date,
1351 const struct timeval *tv,
1352 int *error_ret)
1353{
1354 int number = 0;
1355 int touched = 0;
1356 struct tm tm, now;
1357 time_t time_sec;
1358
1359 time_sec = tv->tv_sec;
1360 localtime_r(&time_sec, &tm);
1361 now = tm;
1362
1363 tm.tm_year = -1;
1364 tm.tm_mon = -1;
1365 tm.tm_mday = -1;
1366
1367 for (;;) {
1368 unsigned char c = *date;
1369 if (!c)
1370 break;
1371 date++;
1372 if (isdigit(c)) {
1373 pending_number(&tm, &number);
1374 date = approxidate_digit(date-1, &tm, &number, time_sec);
1375 touched = 1;
1376 continue;
1377 }
1378 if (isalpha(c))
1379 date = approxidate_alpha(date-1, &tm, &now, &number, &touched);
1380 }
1381 pending_number(&tm, &number);
1382 if (!touched)
1383 *error_ret = 1;
1384 return (timestamp_t)update_tm(&tm, &now, 0);
1385}
1386
1387timestamp_t approxidate_careful(const char *date, int *error_ret)
1388{
1389 struct timeval tv;
1390 timestamp_t timestamp;
1391 int offset;
1392 int dummy = 0;
1393 if (!error_ret)
1394 error_ret = &dummy;
1395
1396 if (!parse_date_basic(date, ×tamp, &offset)) {
1397 *error_ret = 0;
1398 return timestamp;
1399 }
1400
1401 get_time(&tv);
1402 return approxidate_str(date, &tv, error_ret);
1403}
1404
1405int date_overflows(timestamp_t t)
1406{
1407 time_t sys;
1408
1409 /* If we overflowed our timestamp data type, that's bad... */
1410 if ((uintmax_t)t >= TIME_MAX)
1411 return 1;
1412
1413 /*
1414 * ...but we also are going to feed the result to system
1415 * functions that expect time_t, which is often "signed long".
1416 * Make sure that we fit into time_t, as well.
1417 */
1418 sys = t;
1419 return t != sys || (t < 1) != (sys < 1);
1420}