rev-list: handle flags for --indexed-objects
[git/git.git] / date.c
CommitLineData
ecee9d9e
ET
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6
e99d59ff
LT
7#include "cache.h"
8
bb5799d6
JS
9/*
10 * This is like mktime, but without normalization of tm_wday and tm_yday.
11 */
23418ea9 12static time_t tm_to_time_t(const struct tm *tm)
ecee9d9e
ET
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--;
36e4986f
LT
27 if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0)
28 return -1;
ecee9d9e
ET
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
33static const char *month_names[] = {
89967023
LT
34 "January", "February", "March", "April", "May", "June",
35 "July", "August", "September", "October", "November", "December"
ecee9d9e
ET
36};
37
38static const char *weekday_names[] = {
6b7b0427 39 "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
ecee9d9e
ET
40};
41
dddbad72 42static time_t gm_time_t(timestamp_t time, int tz)
9a8e35e9
LT
43{
44 int minutes;
45
46 minutes = tz < 0 ? -tz : tz;
47 minutes = (minutes / 100)*60 + (minutes % 100);
48 minutes = tz < 0 ? -minutes : minutes;
1e65a982
JS
49
50 if (minutes > 0) {
51 if (unsigned_add_overflows(time, minutes * 60))
52 die("Timestamp+tz too large: %"PRItime" +%04d",
53 time, tz);
54 } else if (time < -minutes * 60)
55 die("Timestamp before Unix epoch: %"PRItime" %04d", time, tz);
56 time += minutes * 60;
57 if (date_overflows(time))
58 die("Timestamp too large for this system: %"PRItime, time);
59 return (time_t)time;
9a8e35e9
LT
60}
61
f80cd783
LT
62/*
63 * The "tz" thing is passed in as this strange "decimal parse of tz"
64 * thing, which means that tz -0100 is passed in as the integer -100,
65 * even though it means "sixty minutes off"
66 */
dddbad72 67static struct tm *time_to_tm(timestamp_t time, int tz)
f80cd783 68{
9a8e35e9 69 time_t t = gm_time_t(time, tz);
2a387043
JH
70 return gmtime(&t);
71}
72
9eafe86d 73static struct tm *time_to_tm_local(timestamp_t time)
6eced3ec
JK
74{
75 time_t t = time;
76 return localtime(&t);
77}
78
a7b02ccf
JH
79/*
80 * What value of "tz" was in effect back then at "time" in the
81 * local timezone?
82 */
dddbad72 83static int local_tzoffset(timestamp_t time)
a7b02ccf
JH
84{
85 time_t t, t_local;
86 struct tm tm;
87 int offset, eastwest;
88
1e65a982
JS
89 if (date_overflows(time))
90 die("Timestamp too large for this system: %"PRItime, time);
91
92 t = (time_t)time;
a7b02ccf 93 localtime_r(&t, &tm);
bb5799d6 94 t_local = tm_to_time_t(&tm);
a7b02ccf 95
bab74837
JK
96 if (t_local == -1)
97 return 0; /* error; just use +0000 */
a7b02ccf
JH
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
dddbad72 110void show_date_relative(timestamp_t time, int tz,
33012fc4 111 const struct timeval *now,
7d29afd4 112 struct strbuf *timebuf)
33012fc4 113{
dddbad72 114 timestamp_t diff;
7d29afd4
JN
115 if (now->tv_sec < time) {
116 strbuf_addstr(timebuf, _("in the future"));
117 return;
118 }
33012fc4
AR
119 diff = now->tv_sec - time;
120 if (diff < 90) {
7d29afd4 121 strbuf_addf(timebuf,
cb71f8bd 122 Q_("%"PRItime" second ago", "%"PRItime" seconds ago", diff), diff);
7d29afd4 123 return;
33012fc4
AR
124 }
125 /* Turn it into minutes */
126 diff = (diff + 30) / 60;
127 if (diff < 90) {
7d29afd4 128 strbuf_addf(timebuf,
cb71f8bd 129 Q_("%"PRItime" minute ago", "%"PRItime" minutes ago", diff), diff);
7d29afd4 130 return;
33012fc4
AR
131 }
132 /* Turn it into hours */
133 diff = (diff + 30) / 60;
134 if (diff < 36) {
7d29afd4 135 strbuf_addf(timebuf,
cb71f8bd 136 Q_("%"PRItime" hour ago", "%"PRItime" hours ago", diff), diff);
7d29afd4 137 return;
33012fc4
AR
138 }
139 /* We deal with number of days from here on */
140 diff = (diff + 12) / 24;
141 if (diff < 14) {
7d29afd4 142 strbuf_addf(timebuf,
cb71f8bd 143 Q_("%"PRItime" day ago", "%"PRItime" days ago", diff), diff);
7d29afd4 144 return;
33012fc4
AR
145 }
146 /* Say weeks for the past 10 weeks or so */
147 if (diff < 70) {
7d29afd4 148 strbuf_addf(timebuf,
cb71f8bd 149 Q_("%"PRItime" week ago", "%"PRItime" weeks ago", (diff + 3) / 7),
7d29afd4
JN
150 (diff + 3) / 7);
151 return;
33012fc4
AR
152 }
153 /* Say months for the past 12 months or so */
dbc1b1f7 154 if (diff < 365) {
7d29afd4 155 strbuf_addf(timebuf,
cb71f8bd 156 Q_("%"PRItime" month ago", "%"PRItime" months ago", (diff + 15) / 30),
7d29afd4
JN
157 (diff + 15) / 30);
158 return;
33012fc4
AR
159 }
160 /* Give years and months for 5 years or so */
161 if (diff < 1825) {
dddbad72
JS
162 timestamp_t totalmonths = (diff * 12 * 2 + 365) / (365 * 2);
163 timestamp_t years = totalmonths / 12;
164 timestamp_t months = totalmonths % 12;
7d29afd4
JN
165 if (months) {
166 struct strbuf sb = STRBUF_INIT;
cb71f8bd 167 strbuf_addf(&sb, Q_("%"PRItime" year", "%"PRItime" years", years), years);
7d29afd4 168 strbuf_addf(timebuf,
fcaed04d 169 /* TRANSLATORS: "%s" is "<n> years" */
cb71f8bd 170 Q_("%s, %"PRItime" month ago", "%s, %"PRItime" months ago", months),
7d29afd4
JN
171 sb.buf, months);
172 strbuf_release(&sb);
173 } else
174 strbuf_addf(timebuf,
cb71f8bd 175 Q_("%"PRItime" year ago", "%"PRItime" years ago", years), years);
7d29afd4 176 return;
33012fc4
AR
177 }
178 /* Otherwise, just years. Centuries is probably overkill. */
7d29afd4 179 strbuf_addf(timebuf,
cb71f8bd 180 Q_("%"PRItime" year ago", "%"PRItime" years ago", (diff + 183) / 365),
7d29afd4 181 (diff + 183) / 365);
33012fc4
AR
182}
183
a5481a6c
JK
184struct date_mode *date_mode_from_type(enum date_mode_type type)
185{
186 static struct date_mode mode;
aa1462cc 187 if (type == DATE_STRFTIME)
033abf97 188 BUG("cannot create anonymous strftime date_mode struct");
a5481a6c 189 mode.type = type;
add00ba2 190 mode.local = 0;
a5481a6c
JK
191 return &mode;
192}
193
dddbad72 194const char *show_date(timestamp_t time, int tz, const struct date_mode *mode)
2a387043
JH
195{
196 struct tm *tm;
7d29afd4 197 static struct strbuf timebuf = STRBUF_INIT;
2a387043 198
642833db
JK
199 if (mode->type == DATE_UNIX) {
200 strbuf_reset(&timebuf);
cb71f8bd 201 strbuf_addf(&timebuf, "%"PRItime, time);
642833db
JK
202 return timebuf.buf;
203 }
204
add00ba2 205 if (mode->local)
dc6d782c
JK
206 tz = local_tzoffset(time);
207
a5481a6c 208 if (mode->type == DATE_RAW) {
7d29afd4 209 strbuf_reset(&timebuf);
cb71f8bd 210 strbuf_addf(&timebuf, "%"PRItime" %+05d", time, tz);
7d29afd4 211 return timebuf.buf;
7dff9b30
LT
212 }
213
a5481a6c 214 if (mode->type == DATE_RELATIVE) {
9a8e35e9 215 struct timeval now;
7d29afd4
JN
216
217 strbuf_reset(&timebuf);
9a8e35e9 218 gettimeofday(&now, NULL);
7d29afd4
JN
219 show_date_relative(time, tz, &now, &timebuf);
220 return timebuf.buf;
9a8e35e9
LT
221 }
222
6eced3ec
JK
223 if (mode->local)
224 tm = time_to_tm_local(time);
225 else
226 tm = time_to_tm(time, tz);
2b15846d
JK
227 if (!tm) {
228 tm = time_to_tm(0, 0);
229 tz = 0;
230 }
7d29afd4
JN
231
232 strbuf_reset(&timebuf);
a5481a6c 233 if (mode->type == DATE_SHORT)
7d29afd4 234 strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
f8493ec0 235 tm->tm_mon + 1, tm->tm_mday);
a5481a6c 236 else if (mode->type == DATE_ISO8601)
7d29afd4 237 strbuf_addf(&timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
ee8f838e
RR
238 tm->tm_year + 1900,
239 tm->tm_mon + 1,
240 tm->tm_mday,
241 tm->tm_hour, tm->tm_min, tm->tm_sec,
242 tz);
a5481a6c 243 else if (mode->type == DATE_ISO8601_STRICT) {
466fb674
BB
244 char sign = (tz >= 0) ? '+' : '-';
245 tz = abs(tz);
246 strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d",
247 tm->tm_year + 1900,
248 tm->tm_mon + 1,
249 tm->tm_mday,
250 tm->tm_hour, tm->tm_min, tm->tm_sec,
251 sign, tz / 100, tz % 100);
a5481a6c 252 } else if (mode->type == DATE_RFC2822)
7d29afd4 253 strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
73013afd
JH
254 weekday_names[tm->tm_wday], tm->tm_mday,
255 month_names[tm->tm_mon], tm->tm_year + 1900,
256 tm->tm_hour, tm->tm_min, tm->tm_sec, tz);
aa1462cc 257 else if (mode->type == DATE_STRFTIME)
6eced3ec 258 strbuf_addftime(&timebuf, mode->strftime_fmt, tm, tz,
3b702239 259 !mode->local);
f8493ec0 260 else
7d29afd4 261 strbuf_addf(&timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d",
f8493ec0
JS
262 weekday_names[tm->tm_wday],
263 month_names[tm->tm_mon],
264 tm->tm_mday,
265 tm->tm_hour, tm->tm_min, tm->tm_sec,
a7b02ccf 266 tm->tm_year + 1900,
add00ba2 267 mode->local ? 0 : ' ',
a7b02ccf 268 tz);
7d29afd4 269 return timebuf.buf;
f80cd783
LT
270}
271
89967023
LT
272/*
273 * Check these. And note how it doesn't do the summer-time conversion.
274 *
275 * In my world, it's always summer, and things are probably a bit off
276 * in other ways too.
277 */
278static const struct {
279 const char *name;
280 int offset;
5e2a78a4 281 int dst;
89967023 282} timezone_names[] = {
5e2a78a4
LT
283 { "IDLW", -12, 0, }, /* International Date Line West */
284 { "NT", -11, 0, }, /* Nome */
285 { "CAT", -10, 0, }, /* Central Alaska */
286 { "HST", -10, 0, }, /* Hawaii Standard */
287 { "HDT", -10, 1, }, /* Hawaii Daylight */
288 { "YST", -9, 0, }, /* Yukon Standard */
289 { "YDT", -9, 1, }, /* Yukon Daylight */
290 { "PST", -8, 0, }, /* Pacific Standard */
291 { "PDT", -8, 1, }, /* Pacific Daylight */
292 { "MST", -7, 0, }, /* Mountain Standard */
293 { "MDT", -7, 1, }, /* Mountain Daylight */
294 { "CST", -6, 0, }, /* Central Standard */
295 { "CDT", -6, 1, }, /* Central Daylight */
296 { "EST", -5, 0, }, /* Eastern Standard */
297 { "EDT", -5, 1, }, /* Eastern Daylight */
298 { "AST", -3, 0, }, /* Atlantic Standard */
299 { "ADT", -3, 1, }, /* Atlantic Daylight */
300 { "WAT", -1, 0, }, /* West Africa */
301
302 { "GMT", 0, 0, }, /* Greenwich Mean */
303 { "UTC", 0, 0, }, /* Universal (Coordinated) */
75b37e70 304 { "Z", 0, 0, }, /* Zulu, alias for UTC */
5e2a78a4
LT
305
306 { "WET", 0, 0, }, /* Western European */
307 { "BST", 0, 1, }, /* British Summer */
308 { "CET", +1, 0, }, /* Central European */
309 { "MET", +1, 0, }, /* Middle European */
310 { "MEWT", +1, 0, }, /* Middle European Winter */
311 { "MEST", +1, 1, }, /* Middle European Summer */
312 { "CEST", +1, 1, }, /* Central European Summer */
313 { "MESZ", +1, 1, }, /* Middle European Summer */
314 { "FWT", +1, 0, }, /* French Winter */
315 { "FST", +1, 1, }, /* French Summer */
316 { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
92e2311b 317 { "EEST", +2, 1, }, /* Eastern European Daylight */
5e2a78a4
LT
318 { "WAST", +7, 0, }, /* West Australian Standard */
319 { "WADT", +7, 1, }, /* West Australian Daylight */
320 { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
321 { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
322 { "EAST", +10, 0, }, /* Eastern Australian Standard */
323 { "EADT", +10, 1, }, /* Eastern Australian Daylight */
324 { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
695ed472
SD
325 { "NZT", +12, 0, }, /* New Zealand */
326 { "NZST", +12, 0, }, /* New Zealand Standard */
327 { "NZDT", +12, 1, }, /* New Zealand Daylight */
5e2a78a4 328 { "IDLE", +12, 0, }, /* International Date Line East */
89967023 329};
ecee9d9e 330
89967023 331static int match_string(const char *date, const char *str)
ecee9d9e 332{
89967023
LT
333 int i = 0;
334
335 for (i = 0; *date; date++, str++, i++) {
336 if (*date == *str)
337 continue;
338 if (toupper(*date) == toupper(*str))
339 continue;
340 if (!isalnum(*date))
341 break;
342 return 0;
343 }
344 return i;
ecee9d9e
ET
345}
346
68849b54
LT
347static int skip_alpha(const char *date)
348{
349 int i = 0;
350 do {
351 i++;
352 } while (isalpha(date[i]));
353 return i;
354}
355
89967023
LT
356/*
357* Parse month, weekday, or timezone name
358*/
359static int match_alpha(const char *date, struct tm *tm, int *offset)
ecee9d9e 360{
89967023 361 int i;
ecee9d9e 362
89967023
LT
363 for (i = 0; i < 12; i++) {
364 int match = match_string(date, month_names[i]);
365 if (match >= 3) {
366 tm->tm_mon = i;
367 return match;
ecee9d9e 368 }
89967023 369 }
ecee9d9e 370
89967023
LT
371 for (i = 0; i < 7; i++) {
372 int match = match_string(date, weekday_names[i]);
373 if (match >= 3) {
374 tm->tm_wday = i;
375 return match;
376 }
377 }
ecee9d9e 378
b4f2a6ac 379 for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
89967023 380 int match = match_string(date, timezone_names[i].name);
75b37e70 381 if (match >= 3 || match == strlen(timezone_names[i].name)) {
5e2a78a4
LT
382 int off = timezone_names[i].offset;
383
384 /* This is bogus, but we like summer */
385 off += timezone_names[i].dst;
386
92e2311b
LT
387 /* Only use the tz name offset if we don't have anything better */
388 if (*offset == -1)
389 *offset = 60*off;
390
89967023 391 return match;
ecee9d9e
ET
392 }
393 }
ecee9d9e 394
68849b54 395 if (match_string(date, "PM") == 2) {
18b633ca
LT
396 tm->tm_hour = (tm->tm_hour % 12) + 12;
397 return 2;
398 }
399
400 if (match_string(date, "AM") == 2) {
401 tm->tm_hour = (tm->tm_hour % 12) + 0;
68849b54
LT
402 return 2;
403 }
404
89967023 405 /* BAD CRAP */
68849b54 406 return skip_alpha(date);
89967023 407}
ecee9d9e 408
38035cf4 409static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
89967023 410{
198b0fb6 411 if (month > 0 && month < 13 && day > 0 && day < 32) {
38035cf4
JH
412 struct tm check = *tm;
413 struct tm *r = (now_tm ? &check : tm);
414 time_t specified;
415
416 r->tm_mon = month - 1;
417 r->tm_mday = day;
198b0fb6 418 if (year == -1) {
38035cf4
JH
419 if (!now_tm)
420 return 1;
421 r->tm_year = now_tm->tm_year;
89967023 422 }
38035cf4
JH
423 else if (year >= 1970 && year < 2100)
424 r->tm_year = year - 1900;
425 else if (year > 70 && year < 100)
426 r->tm_year = year;
427 else if (year < 38)
428 r->tm_year = year + 100;
429 else
198b0fb6 430 return 0;
38035cf4
JH
431 if (!now_tm)
432 return 1;
433
bb5799d6 434 specified = tm_to_time_t(r);
198b0fb6 435
38035cf4
JH
436 /* Be it commit time or author time, it does not make
437 * sense to specify timestamp way into the future. Make
438 * sure it is not later than ten days from now...
439 */
e6e87516 440 if ((specified != -1) && (now + 10*24*3600 < specified))
38035cf4
JH
441 return 0;
442 tm->tm_mon = r->tm_mon;
443 tm->tm_mday = r->tm_mday;
444 if (year != -1)
445 tm->tm_year = r->tm_year;
198b0fb6 446 return 1;
89967023 447 }
198b0fb6
LT
448 return 0;
449}
ecee9d9e 450
dddbad72 451static int match_multi_number(timestamp_t num, char c, const char *date,
073281e2 452 char *end, struct tm *tm, time_t now)
198b0fb6 453{
38035cf4
JH
454 struct tm now_tm;
455 struct tm *refuse_future;
198b0fb6
LT
456 long num2, num3;
457
458 num2 = strtol(end+1, &end, 10);
459 num3 = -1;
460 if (*end == c && isdigit(end[1]))
461 num3 = strtol(end+1, &end, 10);
462
463 /* Time? Date? */
89967023 464 switch (c) {
198b0fb6
LT
465 case ':':
466 if (num3 < 0)
467 num3 = 0;
468 if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
469 tm->tm_hour = num;
470 tm->tm_min = num2;
471 tm->tm_sec = num3;
89967023
LT
472 break;
473 }
198b0fb6 474 return 0;
89967023
LT
475
476 case '-':
477 case '/':
38035cf4 478 case '.':
073281e2
JK
479 if (!now)
480 now = time(NULL);
38035cf4
JH
481 refuse_future = NULL;
482 if (gmtime_r(&now, &now_tm))
483 refuse_future = &now_tm;
484
198b0fb6
LT
485 if (num > 70) {
486 /* yyyy-mm-dd? */
d3723953 487 if (is_date(num, num2, num3, NULL, now, tm))
198b0fb6
LT
488 break;
489 /* yyyy-dd-mm? */
d3723953 490 if (is_date(num, num3, num2, NULL, now, tm))
89967023 491 break;
198b0fb6 492 }
38035cf4
JH
493 /* Our eastern European friends say dd.mm.yy[yy]
494 * is the norm there, so giving precedence to
495 * mm/dd/yy[yy] form only when separator is not '.'
496 */
497 if (c != '.' &&
498 is_date(num3, num, num2, refuse_future, now, tm))
499 break;
500 /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
501 if (is_date(num3, num2, num, refuse_future, now, tm))
89967023 502 break;
38035cf4
JH
503 /* Funny European mm.dd.yy */
504 if (c == '.' &&
505 is_date(num3, num, num2, refuse_future, now, tm))
198b0fb6
LT
506 break;
507 return 0;
508 }
509 return end - date;
510}
511
36e4986f
LT
512/*
513 * Have we filled in any part of the time/date yet?
514 * We just do a binary 'and' to see if the sign bit
515 * is set in all the values.
516 */
9f2b6d29
LT
517static inline int nodate(struct tm *tm)
518{
36e4986f
LT
519 return (tm->tm_year &
520 tm->tm_mon &
521 tm->tm_mday &
522 tm->tm_hour &
523 tm->tm_min &
524 tm->tm_sec) < 0;
9f2b6d29
LT
525}
526
198b0fb6 527/*
a6080a0a 528 * We've seen a digit. Time? Year? Date?
198b0fb6 529 */
26a2d8ae 530static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
198b0fb6
LT
531{
532 int n;
533 char *end;
dddbad72 534 timestamp_t num;
198b0fb6 535
1aeb7e75 536 num = parse_timestamp(date, &end, 10);
198b0fb6
LT
537
538 /*
a1a5a634
JS
539 * Seconds since 1970? We trigger on that for any numbers with
540 * more than 8 digits. This is because we don't want to rule out
541 * numbers like 20070606 as a YYYYMMDD date.
198b0fb6 542 */
9f2b6d29 543 if (num >= 100000000 && nodate(tm)) {
198b0fb6 544 time_t time = num;
9cb480f2
JH
545 if (gmtime_r(&time, tm)) {
546 *tm_gmt = 1;
198b0fb6 547 return end - date;
9cb480f2 548 }
198b0fb6
LT
549 }
550
551 /*
38035cf4 552 * Check for special formats: num[-.:/]num[same]num
198b0fb6
LT
553 */
554 switch (*end) {
555 case ':':
38035cf4 556 case '.':
198b0fb6
LT
557 case '/':
558 case '-':
559 if (isdigit(end[1])) {
073281e2 560 int match = match_multi_number(num, *end, date, end, tm, 0);
198b0fb6
LT
561 if (match)
562 return match;
89967023
LT
563 }
564 }
198b0fb6
LT
565
566 /*
567 * None of the special formats? Try to guess what
568 * the number meant. We use the number of digits
569 * to make a more educated guess..
570 */
571 n = 0;
572 do {
573 n++;
574 } while (isdigit(date[n]));
575
576 /* Four-digit year or a timezone? */
577 if (n == 4) {
7122f82f 578 if (num <= 1400 && *offset == -1) {
198b0fb6
LT
579 unsigned int minutes = num % 100;
580 unsigned int hours = num / 100;
581 *offset = hours*60 + minutes;
582 } else if (num > 1900 && num < 2100)
583 tm->tm_year = num - 1900;
584 return n;
585 }
586
9f2b6d29
LT
587 /*
588 * Ignore lots of numerals. We took care of 4-digit years above.
589 * Days or months must be one or two digits.
590 */
591 if (n > 2)
592 return n;
593
198b0fb6
LT
594 /*
595 * NOTE! We will give precedence to day-of-month over month or
82f9d58a 596 * year numbers in the 1-12 range. So 05 is always "mday 5",
198b0fb6
LT
597 * unless we already have a mday..
598 *
599 * IOW, 01 Apr 05 parses as "April 1st, 2005".
600 */
601 if (num > 0 && num < 32 && tm->tm_mday < 0) {
602 tm->tm_mday = num;
603 return n;
604 }
605
606 /* Two-digit year? */
607 if (n == 2 && tm->tm_year < 0) {
608 if (num < 10 && tm->tm_mday >= 0) {
609 tm->tm_year = num + 100;
610 return n;
611 }
612 if (num >= 70) {
613 tm->tm_year = num;
614 return n;
615 }
616 }
617
90290552 618 if (num > 0 && num < 13 && tm->tm_mon < 0)
198b0fb6 619 tm->tm_mon = num-1;
a6080a0a 620
198b0fb6 621 return n;
89967023 622}
ecee9d9e 623
26a2d8ae 624static int match_tz(const char *date, int *offp)
89967023
LT
625{
626 char *end;
ee646eb4
HL
627 int hour = strtoul(date + 1, &end, 10);
628 int n = end - (date + 1);
629 int min = 0;
ecee9d9e 630
ee646eb4
HL
631 if (n == 4) {
632 /* hhmm */
633 min = hour % 100;
634 hour = hour / 100;
635 } else if (n != 2) {
636 min = 99; /* random crap */
637 } else if (*end == ':') {
638 /* hh:mm? */
639 min = strtoul(end + 1, &end, 10);
640 if (end - (date + 1) != 5)
641 min = 99; /* random crap */
642 } /* otherwise we parsed "hh" */
ecee9d9e 643
198b0fb6 644 /*
ee646eb4
HL
645 * Don't accept any random crap. Even though some places have
646 * offset larger than 12 hours (e.g. Pacific/Kiritimati is at
647 * UTC+14), there is something wrong if hour part is much
648 * larger than that. We might also want to check that the
649 * minutes are divisible by 15 or something too. (Offset of
650 * Kathmandu, Nepal is UTC+5:45)
198b0fb6 651 */
ee646eb4
HL
652 if (min < 60 && hour < 24) {
653 int offset = hour * 60 + min;
68849b54
LT
654 if (*date == '-')
655 offset = -offset;
68849b54
LT
656 *offp = offset;
657 }
89967023
LT
658 return end - date;
659}
ecee9d9e 660
dddbad72 661static void date_string(timestamp_t date, int offset, struct strbuf *buf)
01c6ad29
LT
662{
663 int sign = '+';
664
665 if (offset < 0) {
666 offset = -offset;
667 sign = '-';
668 }
cb71f8bd 669 strbuf_addf(buf, "%"PRItime" %c%02d%02d", date, sign, offset / 60, offset % 60);
01c6ad29
LT
670}
671
116eb3ab
JH
672/*
673 * Parse a string like "0 +0000" as ancient timestamp near epoch, but
674 * only when it appears not as part of any other string.
675 */
dddbad72 676static int match_object_header_date(const char *date, timestamp_t *timestamp, int *offset)
116eb3ab
JH
677{
678 char *end;
dddbad72 679 timestamp_t stamp;
116eb3ab
JH
680 int ofs;
681
be21d167 682 if (*date < '0' || '9' < *date)
116eb3ab 683 return -1;
1aeb7e75 684 stamp = parse_timestamp(date, &end, 10);
dddbad72 685 if (*end != ' ' || stamp == TIME_MAX || (end[1] != '+' && end[1] != '-'))
116eb3ab
JH
686 return -1;
687 date = end + 2;
688 ofs = strtol(date, &end, 10);
689 if ((*end != '\0' && (*end != '\n')) || end != date + 4)
690 return -1;
691 ofs = (ofs / 100) * 60 + (ofs % 100);
692 if (date[-1] == '-')
693 ofs = -ofs;
694 *timestamp = stamp;
695 *offset = ofs;
696 return 0;
697}
698
89967023
LT
699/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
700 (i.e. English) day/month names, and it doesn't work correctly with %z. */
dddbad72 701int parse_date_basic(const char *date, timestamp_t *timestamp, int *offset)
89967023
LT
702{
703 struct tm tm;
c5043cc1 704 int tm_gmt;
dddbad72 705 timestamp_t dummy_timestamp;
c5043cc1
RR
706 int dummy_offset;
707
708 if (!timestamp)
709 timestamp = &dummy_timestamp;
710 if (!offset)
711 offset = &dummy_offset;
ecee9d9e 712
89967023
LT
713 memset(&tm, 0, sizeof(tm));
714 tm.tm_year = -1;
715 tm.tm_mon = -1;
716 tm.tm_mday = -1;
eaa85129 717 tm.tm_isdst = -1;
36e4986f
LT
718 tm.tm_hour = -1;
719 tm.tm_min = -1;
720 tm.tm_sec = -1;
c5043cc1 721 *offset = -1;
9cb480f2 722 tm_gmt = 0;
89967023 723
2c733fb2
JH
724 if (*date == '@' &&
725 !match_object_header_date(date + 1, timestamp, offset))
116eb3ab 726 return 0; /* success */
89967023
LT
727 for (;;) {
728 int match = 0;
729 unsigned char c = *date;
730
731 /* Stop at end of string or newline */
732 if (!c || c == '\n')
733 break;
734
735 if (isalpha(c))
c5043cc1 736 match = match_alpha(date, &tm, offset);
89967023 737 else if (isdigit(c))
c5043cc1 738 match = match_digit(date, &tm, offset, &tm_gmt);
89967023 739 else if ((c == '-' || c == '+') && isdigit(date[1]))
c5043cc1 740 match = match_tz(date, offset);
89967023
LT
741
742 if (!match) {
743 /* BAD CRAP */
744 match = 1;
a6080a0a 745 }
89967023
LT
746
747 date += match;
748 }
ecee9d9e 749
f6e63621 750 /* do not use mktime(), which uses local timezone, here */
c5043cc1 751 *timestamp = tm_to_time_t(&tm);
7fcec48d
JH
752 if (*timestamp == -1)
753 return -1;
754
e1033da6 755 if (*offset == -1) {
f6e63621
JH
756 time_t temp_time;
757
758 /* gmtime_r() in match_digit() may have clobbered it */
759 tm.tm_isdst = -1;
760 temp_time = mktime(&tm);
e1033da6
MG
761 if ((time_t)*timestamp > temp_time) {
762 *offset = ((time_t)*timestamp - temp_time) / 60;
763 } else {
764 *offset = -(int)((temp_time - (time_t)*timestamp) / 60);
765 }
766 }
eaa85129 767
9cb480f2 768 if (!tm_gmt)
c5043cc1 769 *timestamp -= *offset * 60;
9644c061 770 return 0; /* success */
c5043cc1
RR
771}
772
dddbad72 773int parse_expiry_date(const char *date, timestamp_t *timestamp)
3d27b9b0
JH
774{
775 int errors = 0;
776
777 if (!strcmp(date, "never") || !strcmp(date, "false"))
778 *timestamp = 0;
779 else if (!strcmp(date, "all") || !strcmp(date, "now"))
780 /*
781 * We take over "now" here, which usually translates
782 * to the current timestamp. This is because the user
783 * really means to expire everything she has done in
784 * the past, and by definition reflogs are the record
785 * of the past, and there is nothing from the future
786 * to be kept.
787 */
dddbad72 788 *timestamp = TIME_MAX;
3d27b9b0
JH
789 else
790 *timestamp = approxidate_careful(date, &errors);
791
792 return errors;
793}
794
c33ddc2e 795int parse_date(const char *date, struct strbuf *result)
c5043cc1 796{
dddbad72 797 timestamp_t timestamp;
c5043cc1 798 int offset;
9644c061 799 if (parse_date_basic(date, &timestamp, &offset))
c5043cc1 800 return -1;
c33ddc2e
JK
801 date_string(timestamp, offset, result);
802 return 0;
ecee9d9e
ET
803}
804
add00ba2
JK
805static enum date_mode_type parse_date_type(const char *format, const char **end)
806{
807 if (skip_prefix(format, "relative", end))
808 return DATE_RELATIVE;
809 if (skip_prefix(format, "iso8601-strict", end) ||
810 skip_prefix(format, "iso-strict", end))
811 return DATE_ISO8601_STRICT;
812 if (skip_prefix(format, "iso8601", end) ||
813 skip_prefix(format, "iso", end))
814 return DATE_ISO8601;
815 if (skip_prefix(format, "rfc2822", end) ||
816 skip_prefix(format, "rfc", end))
817 return DATE_RFC2822;
818 if (skip_prefix(format, "short", end))
819 return DATE_SHORT;
820 if (skip_prefix(format, "default", end))
821 return DATE_NORMAL;
822 if (skip_prefix(format, "raw", end))
823 return DATE_RAW;
642833db
JK
824 if (skip_prefix(format, "unix", end))
825 return DATE_UNIX;
add00ba2
JK
826 if (skip_prefix(format, "format", end))
827 return DATE_STRFTIME;
828
829 die("unknown date format %s", format);
830}
831
a5481a6c 832void parse_date_format(const char *format, struct date_mode *mode)
856665f8 833{
add00ba2
JK
834 const char *p;
835
836 /* historical alias */
837 if (!strcmp(format, "local"))
838 format = "default-local";
839
840 mode->type = parse_date_type(format, &p);
841 mode->local = 0;
842
843 if (skip_prefix(p, "-local", &p))
844 mode->local = 1;
845
846 if (mode->type == DATE_STRFTIME) {
847 if (!skip_prefix(p, ":", &p))
848 die("date format missing colon separator: %s", format);
849 mode->strftime_fmt = xstrdup(p);
850 } else if (*p)
856665f8
AP
851 die("unknown date format %s", format);
852}
853
c33ddc2e 854void datestamp(struct strbuf *out)
ecee9d9e
ET
855{
856 time_t now;
857 int offset;
858
859 time(&now);
860
bb5799d6 861 offset = tm_to_time_t(localtime(&now)) - now;
ecee9d9e
ET
862 offset /= 60;
863
c33ddc2e 864 date_string(now, offset, out);
ecee9d9e 865}
3c07b1d1 866
90290552
LT
867/*
868 * Relative time update (eg "2 days ago"). If we haven't set the time
869 * yet, we need to set it from current time.
870 */
dddbad72 871static time_t update_tm(struct tm *tm, struct tm *now, time_t sec)
3c07b1d1 872{
90290552
LT
873 time_t n;
874
875 if (tm->tm_mday < 0)
876 tm->tm_mday = now->tm_mday;
877 if (tm->tm_mon < 0)
878 tm->tm_mon = now->tm_mon;
879 if (tm->tm_year < 0) {
880 tm->tm_year = now->tm_year;
881 if (tm->tm_mon > now->tm_mon)
882 tm->tm_year--;
883 }
884
885 n = mktime(tm) - sec;
3c07b1d1 886 localtime_r(&n, tm);
90290552 887 return n;
3c07b1d1
LT
888}
889
93cfa7c7
JH
890static void date_now(struct tm *tm, struct tm *now, int *num)
891{
892 update_tm(tm, now, 0);
893}
894
90290552 895static void date_yesterday(struct tm *tm, struct tm *now, int *num)
a8aca418 896{
90290552 897 update_tm(tm, now, 24*60*60);
a8aca418
LT
898}
899
90290552 900static void date_time(struct tm *tm, struct tm *now, int hour)
a8aca418
LT
901{
902 if (tm->tm_hour < hour)
90290552 903 date_yesterday(tm, now, NULL);
a8aca418
LT
904 tm->tm_hour = hour;
905 tm->tm_min = 0;
906 tm->tm_sec = 0;
907}
908
90290552 909static void date_midnight(struct tm *tm, struct tm *now, int *num)
a8aca418 910{
90290552 911 date_time(tm, now, 0);
a8aca418
LT
912}
913
90290552 914static void date_noon(struct tm *tm, struct tm *now, int *num)
a8aca418 915{
90290552 916 date_time(tm, now, 12);
a8aca418
LT
917}
918
90290552 919static void date_tea(struct tm *tm, struct tm *now, int *num)
a8aca418 920{
90290552 921 date_time(tm, now, 17);
a8aca418
LT
922}
923
90290552 924static void date_pm(struct tm *tm, struct tm *now, int *num)
393d340e 925{
18b633ca 926 int hour, n = *num;
393d340e
LT
927 *num = 0;
928
18b633ca
LT
929 hour = tm->tm_hour;
930 if (n) {
931 hour = n;
393d340e
LT
932 tm->tm_min = 0;
933 tm->tm_sec = 0;
934 }
18b633ca 935 tm->tm_hour = (hour % 12) + 12;
393d340e
LT
936}
937
90290552 938static void date_am(struct tm *tm, struct tm *now, int *num)
393d340e 939{
18b633ca 940 int hour, n = *num;
393d340e
LT
941 *num = 0;
942
18b633ca
LT
943 hour = tm->tm_hour;
944 if (n) {
945 hour = n;
393d340e
LT
946 tm->tm_min = 0;
947 tm->tm_sec = 0;
948 }
18b633ca 949 tm->tm_hour = (hour % 12);
393d340e
LT
950}
951
90290552 952static void date_never(struct tm *tm, struct tm *now, int *num)
af66366a 953{
8c6b5786
OM
954 time_t n = 0;
955 localtime_r(&n, tm);
af66366a
JS
956}
957
a8aca418
LT
958static const struct special {
959 const char *name;
90290552 960 void (*fn)(struct tm *, struct tm *, int *);
a8aca418
LT
961} special[] = {
962 { "yesterday", date_yesterday },
963 { "noon", date_noon },
964 { "midnight", date_midnight },
965 { "tea", date_tea },
393d340e
LT
966 { "PM", date_pm },
967 { "AM", date_am },
af66366a 968 { "never", date_never },
93cfa7c7 969 { "now", date_now },
a8aca418
LT
970 { NULL }
971};
972
3c07b1d1
LT
973static const char *number_name[] = {
974 "zero", "one", "two", "three", "four",
975 "five", "six", "seven", "eight", "nine", "ten",
976};
977
a8aca418 978static const struct typelen {
3c07b1d1
LT
979 const char *type;
980 int length;
981} typelen[] = {
982 { "seconds", 1 },
983 { "minutes", 60 },
984 { "hours", 60*60 },
985 { "days", 24*60*60 },
986 { "weeks", 7*24*60*60 },
987 { NULL }
a6080a0a 988};
3c07b1d1 989
93cfa7c7 990static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched)
3c07b1d1 991{
a8aca418
LT
992 const struct typelen *tl;
993 const struct special *s;
3c07b1d1 994 const char *end = date;
5df7dbba 995 int i;
3c07b1d1 996
38db01b7 997 while (isalpha(*++end))
5df7dbba 998 ;
3c07b1d1
LT
999
1000 for (i = 0; i < 12; i++) {
1001 int match = match_string(date, month_names[i]);
1002 if (match >= 3) {
1003 tm->tm_mon = i;
93cfa7c7 1004 *touched = 1;
3c07b1d1
LT
1005 return end;
1006 }
1007 }
1008
a8aca418
LT
1009 for (s = special; s->name; s++) {
1010 int len = strlen(s->name);
1011 if (match_string(date, s->name) == len) {
90290552 1012 s->fn(tm, now, num);
93cfa7c7 1013 *touched = 1;
a8aca418
LT
1014 return end;
1015 }
3c07b1d1
LT
1016 }
1017
1018 if (!*num) {
1019 for (i = 1; i < 11; i++) {
1020 int len = strlen(number_name[i]);
1021 if (match_string(date, number_name[i]) == len) {
1022 *num = i;
93cfa7c7 1023 *touched = 1;
3c07b1d1
LT
1024 return end;
1025 }
1026 }
93cfa7c7 1027 if (match_string(date, "last") == 4) {
3c07b1d1 1028 *num = 1;
93cfa7c7
JH
1029 *touched = 1;
1030 }
3c07b1d1
LT
1031 return end;
1032 }
1033
1034 tl = typelen;
1035 while (tl->type) {
1036 int len = strlen(tl->type);
1037 if (match_string(date, tl->type) >= len-1) {
90290552 1038 update_tm(tm, now, tl->length * *num);
3c07b1d1 1039 *num = 0;
93cfa7c7 1040 *touched = 1;
3c07b1d1
LT
1041 return end;
1042 }
1043 tl++;
1044 }
1045
6b7b0427
LT
1046 for (i = 0; i < 7; i++) {
1047 int match = match_string(date, weekday_names[i]);
1048 if (match >= 3) {
1049 int diff, n = *num -1;
1050 *num = 0;
1051
1052 diff = tm->tm_wday - i;
1053 if (diff <= 0)
1054 n++;
1055 diff += 7*n;
1056
90290552 1057 update_tm(tm, now, diff * 24 * 60 * 60);
93cfa7c7 1058 *touched = 1;
6b7b0427
LT
1059 return end;
1060 }
1061 }
1062
3c07b1d1 1063 if (match_string(date, "months") >= 5) {
931e8e27
JK
1064 int n;
1065 update_tm(tm, now, 0); /* fill in date fields if needed */
1066 n = tm->tm_mon - *num;
3c07b1d1
LT
1067 *num = 0;
1068 while (n < 0) {
1069 n += 12;
1070 tm->tm_year--;
1071 }
1072 tm->tm_mon = n;
93cfa7c7 1073 *touched = 1;
3c07b1d1
LT
1074 return end;
1075 }
1076
1077 if (match_string(date, "years") >= 4) {
931e8e27 1078 update_tm(tm, now, 0); /* fill in date fields if needed */
3c07b1d1
LT
1079 tm->tm_year -= *num;
1080 *num = 0;
93cfa7c7 1081 *touched = 1;
3c07b1d1
LT
1082 return end;
1083 }
1084
1085 return end;
1086}
1087
073281e2
JK
1088static const char *approxidate_digit(const char *date, struct tm *tm, int *num,
1089 time_t now)
e92a54d9
LT
1090{
1091 char *end;
dddbad72 1092 timestamp_t number = parse_timestamp(date, &end, 10);
e92a54d9 1093
393d340e
LT
1094 switch (*end) {
1095 case ':':
1096 case '.':
1097 case '/':
1098 case '-':
1099 if (isdigit(end[1])) {
073281e2
JK
1100 int match = match_multi_number(number, *end, date, end,
1101 tm, now);
393d340e
LT
1102 if (match)
1103 return date + match;
1104 }
1105 }
1106
9f2b6d29
LT
1107 /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
1108 if (date[0] != '0' || end - date <= 2)
1109 *num = number;
e92a54d9
LT
1110 return end;
1111}
1112
90290552
LT
1113/*
1114 * Do we have a pending number at the end, or when
1115 * we see a new one? Let's assume it's a month day,
1116 * as in "Dec 6, 1992"
1117 */
1118static void pending_number(struct tm *tm, int *num)
1119{
1120 int number = *num;
1121
1122 if (number) {
1123 *num = 0;
1124 if (tm->tm_mday < 0 && number < 32)
1125 tm->tm_mday = number;
36e4986f
LT
1126 else if (tm->tm_mon < 0 && number < 13)
1127 tm->tm_mon = number-1;
1128 else if (tm->tm_year < 0) {
1129 if (number > 1969 && number < 2100)
1130 tm->tm_year = number - 1900;
1131 else if (number > 69 && number < 100)
1132 tm->tm_year = number;
1133 else if (number < 38)
1134 tm->tm_year = 100 + number;
1135 /* We screw up for number = 00 ? */
1136 }
90290552
LT
1137 }
1138}
1139
dddbad72
JS
1140static timestamp_t approxidate_str(const char *date,
1141 const struct timeval *tv,
1142 int *error_ret)
3c07b1d1
LT
1143{
1144 int number = 0;
93cfa7c7 1145 int touched = 0;
3c07b1d1 1146 struct tm tm, now;
f697b33b 1147 time_t time_sec;
3c07b1d1 1148
33012fc4 1149 time_sec = tv->tv_sec;
f697b33b 1150 localtime_r(&time_sec, &tm);
3c07b1d1 1151 now = tm;
90290552
LT
1152
1153 tm.tm_year = -1;
1154 tm.tm_mon = -1;
1155 tm.tm_mday = -1;
1156
3c07b1d1
LT
1157 for (;;) {
1158 unsigned char c = *date;
1159 if (!c)
1160 break;
1161 date++;
1162 if (isdigit(c)) {
90290552 1163 pending_number(&tm, &number);
073281e2 1164 date = approxidate_digit(date-1, &tm, &number, time_sec);
93cfa7c7 1165 touched = 1;
3c07b1d1
LT
1166 continue;
1167 }
1168 if (isalpha(c))
93cfa7c7 1169 date = approxidate_alpha(date-1, &tm, &now, &number, &touched);
3c07b1d1 1170 }
90290552 1171 pending_number(&tm, &number);
93cfa7c7
JH
1172 if (!touched)
1173 *error_ret = 1;
dddbad72 1174 return (timestamp_t)update_tm(&tm, &now, 0);
3c07b1d1 1175}
33012fc4 1176
dddbad72 1177timestamp_t approxidate_relative(const char *date, const struct timeval *tv)
33012fc4 1178{
dddbad72 1179 timestamp_t timestamp;
c5043cc1 1180 int offset;
93cfa7c7 1181 int errors = 0;
33012fc4 1182
9644c061 1183 if (!parse_date_basic(date, &timestamp, &offset))
c5043cc1 1184 return timestamp;
93cfa7c7 1185 return approxidate_str(date, tv, &errors);
33012fc4
AR
1186}
1187
dddbad72 1188timestamp_t approxidate_careful(const char *date, int *error_ret)
33012fc4
AR
1189{
1190 struct timeval tv;
dddbad72 1191 timestamp_t timestamp;
c5043cc1 1192 int offset;
93cfa7c7
JH
1193 int dummy = 0;
1194 if (!error_ret)
1195 error_ret = &dummy;
33012fc4 1196
9644c061 1197 if (!parse_date_basic(date, &timestamp, &offset)) {
93cfa7c7 1198 *error_ret = 0;
c5043cc1 1199 return timestamp;
93cfa7c7 1200 }
33012fc4
AR
1201
1202 gettimeofday(&tv, NULL);
93cfa7c7 1203 return approxidate_str(date, &tv, error_ret);
33012fc4 1204}
7ca36d93 1205
dddbad72 1206int date_overflows(timestamp_t t)
7ca36d93
JK
1207{
1208 time_t sys;
1209
dddbad72
JS
1210 /* If we overflowed our timestamp data type, that's bad... */
1211 if ((uintmax_t)t >= TIME_MAX)
7ca36d93
JK
1212 return 1;
1213
1214 /*
1215 * ...but we also are going to feed the result to system
1216 * functions that expect time_t, which is often "signed long".
1217 * Make sure that we fit into time_t, as well.
1218 */
1219 sys = t;
1220 return t != sys || (t < 1) != (sys < 1);
1221}