date: document and test "raw-local" mode
[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
9a8e35e9
LT
42static 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
f80cd783
LT
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 */
2a387043 57static struct tm *time_to_tm(unsigned long time, int tz)
f80cd783 58{
9a8e35e9 59 time_t t = gm_time_t(time, tz);
2a387043
JH
60 return gmtime(&t);
61}
62
a7b02ccf
JH
63/*
64 * What value of "tz" was in effect back then at "time" in the
65 * local timezone?
66 */
67static 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);
bb5799d6 75 t_local = tm_to_time_t(&tm);
a7b02ccf 76
bab74837
JK
77 if (t_local == -1)
78 return 0; /* error; just use +0000 */
a7b02ccf
JH
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
7d29afd4 91void show_date_relative(unsigned long time, int tz,
33012fc4 92 const struct timeval *now,
7d29afd4 93 struct strbuf *timebuf)
33012fc4
AR
94{
95 unsigned long diff;
7d29afd4
JN
96 if (now->tv_sec < time) {
97 strbuf_addstr(timebuf, _("in the future"));
98 return;
99 }
33012fc4
AR
100 diff = now->tv_sec - time;
101 if (diff < 90) {
7d29afd4
JN
102 strbuf_addf(timebuf,
103 Q_("%lu second ago", "%lu seconds ago", diff), diff);
104 return;
33012fc4
AR
105 }
106 /* Turn it into minutes */
107 diff = (diff + 30) / 60;
108 if (diff < 90) {
7d29afd4
JN
109 strbuf_addf(timebuf,
110 Q_("%lu minute ago", "%lu minutes ago", diff), diff);
111 return;
33012fc4
AR
112 }
113 /* Turn it into hours */
114 diff = (diff + 30) / 60;
115 if (diff < 36) {
7d29afd4
JN
116 strbuf_addf(timebuf,
117 Q_("%lu hour ago", "%lu hours ago", diff), diff);
118 return;
33012fc4
AR
119 }
120 /* We deal with number of days from here on */
121 diff = (diff + 12) / 24;
122 if (diff < 14) {
7d29afd4
JN
123 strbuf_addf(timebuf,
124 Q_("%lu day ago", "%lu days ago", diff), diff);
125 return;
33012fc4
AR
126 }
127 /* Say weeks for the past 10 weeks or so */
128 if (diff < 70) {
7d29afd4
JN
129 strbuf_addf(timebuf,
130 Q_("%lu week ago", "%lu weeks ago", (diff + 3) / 7),
131 (diff + 3) / 7);
132 return;
33012fc4
AR
133 }
134 /* Say months for the past 12 months or so */
dbc1b1f7 135 if (diff < 365) {
7d29afd4
JN
136 strbuf_addf(timebuf,
137 Q_("%lu month ago", "%lu months ago", (diff + 15) / 30),
138 (diff + 15) / 30);
139 return;
33012fc4
AR
140 }
141 /* Give years and months for 5 years or so */
142 if (diff < 1825) {
f1e9c548
MG
143 unsigned long totalmonths = (diff * 12 * 2 + 365) / (365 * 2);
144 unsigned long years = totalmonths / 12;
145 unsigned long months = totalmonths % 12;
7d29afd4
JN
146 if (months) {
147 struct strbuf sb = STRBUF_INIT;
148 strbuf_addf(&sb, Q_("%lu year", "%lu years", years), years);
7d29afd4 149 strbuf_addf(timebuf,
fcaed04d 150 /* TRANSLATORS: "%s" is "<n> years" */
7d29afd4
JN
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;
33012fc4
AR
158 }
159 /* Otherwise, just years. Centuries is probably overkill. */
7d29afd4
JN
160 strbuf_addf(timebuf,
161 Q_("%lu year ago", "%lu years ago", (diff + 183) / 365),
162 (diff + 183) / 365);
33012fc4
AR
163}
164
a5481a6c
JK
165struct date_mode *date_mode_from_type(enum date_mode_type type)
166{
167 static struct date_mode mode;
aa1462cc
JK
168 if (type == DATE_STRFTIME)
169 die("BUG: cannot create anonymous strftime date_mode struct");
a5481a6c 170 mode.type = type;
add00ba2 171 mode.local = 0;
a5481a6c
JK
172 return &mode;
173}
174
175const char *show_date(unsigned long time, int tz, const struct date_mode *mode)
2a387043
JH
176{
177 struct tm *tm;
7d29afd4 178 static struct strbuf timebuf = STRBUF_INIT;
2a387043 179
add00ba2 180 if (mode->local)
dc6d782c
JK
181 tz = local_tzoffset(time);
182
a5481a6c 183 if (mode->type == DATE_RAW) {
7d29afd4
JN
184 strbuf_reset(&timebuf);
185 strbuf_addf(&timebuf, "%lu %+05d", time, tz);
186 return timebuf.buf;
7dff9b30
LT
187 }
188
a5481a6c 189 if (mode->type == DATE_RELATIVE) {
9a8e35e9 190 struct timeval now;
7d29afd4
JN
191
192 strbuf_reset(&timebuf);
9a8e35e9 193 gettimeofday(&now, NULL);
7d29afd4
JN
194 show_date_relative(time, tz, &now, &timebuf);
195 return timebuf.buf;
9a8e35e9
LT
196 }
197
2a387043 198 tm = time_to_tm(time, tz);
2b15846d
JK
199 if (!tm) {
200 tm = time_to_tm(0, 0);
201 tz = 0;
202 }
7d29afd4
JN
203
204 strbuf_reset(&timebuf);
a5481a6c 205 if (mode->type == DATE_SHORT)
7d29afd4 206 strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
f8493ec0 207 tm->tm_mon + 1, tm->tm_mday);
a5481a6c 208 else if (mode->type == DATE_ISO8601)
7d29afd4 209 strbuf_addf(&timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
ee8f838e
RR
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);
a5481a6c 215 else if (mode->type == DATE_ISO8601_STRICT) {
466fb674
BB
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);
a5481a6c 224 } else if (mode->type == DATE_RFC2822)
7d29afd4 225 strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
73013afd
JH
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);
aa1462cc
JK
229 else if (mode->type == DATE_STRFTIME)
230 strbuf_addftime(&timebuf, mode->strftime_fmt, tm);
f8493ec0 231 else
7d29afd4 232 strbuf_addf(&timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d",
f8493ec0
JS
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,
a7b02ccf 237 tm->tm_year + 1900,
add00ba2 238 mode->local ? 0 : ' ',
a7b02ccf 239 tz);
7d29afd4 240 return timebuf.buf;
f80cd783
LT
241}
242
89967023
LT
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 */
249static const struct {
250 const char *name;
251 int offset;
5e2a78a4 252 int dst;
89967023 253} timezone_names[] = {
5e2a78a4
LT
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) */
75b37e70 275 { "Z", 0, 0, }, /* Zulu, alias for UTC */
5e2a78a4
LT
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 */
92e2311b 288 { "EEST", +2, 1, }, /* Eastern European Daylight */
5e2a78a4
LT
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 */
695ed472
SD
296 { "NZT", +12, 0, }, /* New Zealand */
297 { "NZST", +12, 0, }, /* New Zealand Standard */
298 { "NZDT", +12, 1, }, /* New Zealand Daylight */
5e2a78a4 299 { "IDLE", +12, 0, }, /* International Date Line East */
89967023 300};
ecee9d9e 301
89967023 302static int match_string(const char *date, const char *str)
ecee9d9e 303{
89967023
LT
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;
ecee9d9e
ET
316}
317
68849b54
LT
318static 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
89967023
LT
327/*
328* Parse month, weekday, or timezone name
329*/
330static int match_alpha(const char *date, struct tm *tm, int *offset)
ecee9d9e 331{
89967023 332 int i;
ecee9d9e 333
89967023
LT
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;
ecee9d9e 339 }
89967023 340 }
ecee9d9e 341
89967023
LT
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 }
ecee9d9e 349
b4f2a6ac 350 for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
89967023 351 int match = match_string(date, timezone_names[i].name);
75b37e70 352 if (match >= 3 || match == strlen(timezone_names[i].name)) {
5e2a78a4
LT
353 int off = timezone_names[i].offset;
354
355 /* This is bogus, but we like summer */
356 off += timezone_names[i].dst;
357
92e2311b
LT
358 /* Only use the tz name offset if we don't have anything better */
359 if (*offset == -1)
360 *offset = 60*off;
361
89967023 362 return match;
ecee9d9e
ET
363 }
364 }
ecee9d9e 365
68849b54 366 if (match_string(date, "PM") == 2) {
18b633ca
LT
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;
68849b54
LT
373 return 2;
374 }
375
89967023 376 /* BAD CRAP */
68849b54 377 return skip_alpha(date);
89967023 378}
ecee9d9e 379
38035cf4 380static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
89967023 381{
198b0fb6 382 if (month > 0 && month < 13 && day > 0 && day < 32) {
38035cf4
JH
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;
198b0fb6 389 if (year == -1) {
38035cf4
JH
390 if (!now_tm)
391 return 1;
392 r->tm_year = now_tm->tm_year;
89967023 393 }
38035cf4
JH
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
198b0fb6 401 return 0;
38035cf4
JH
402 if (!now_tm)
403 return 1;
404
bb5799d6 405 specified = tm_to_time_t(r);
198b0fb6 406
38035cf4
JH
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 */
e6e87516 411 if ((specified != -1) && (now + 10*24*3600 < specified))
38035cf4
JH
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;
198b0fb6 417 return 1;
89967023 418 }
198b0fb6
LT
419 return 0;
420}
ecee9d9e 421
073281e2
JK
422static int match_multi_number(unsigned long num, char c, const char *date,
423 char *end, struct tm *tm, time_t now)
198b0fb6 424{
38035cf4
JH
425 struct tm now_tm;
426 struct tm *refuse_future;
198b0fb6
LT
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? */
89967023 435 switch (c) {
198b0fb6
LT
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;
89967023
LT
443 break;
444 }
198b0fb6 445 return 0;
89967023
LT
446
447 case '-':
448 case '/':
38035cf4 449 case '.':
073281e2
JK
450 if (!now)
451 now = time(NULL);
38035cf4
JH
452 refuse_future = NULL;
453 if (gmtime_r(&now, &now_tm))
454 refuse_future = &now_tm;
455
198b0fb6
LT
456 if (num > 70) {
457 /* yyyy-mm-dd? */
d3723953 458 if (is_date(num, num2, num3, NULL, now, tm))
198b0fb6
LT
459 break;
460 /* yyyy-dd-mm? */
d3723953 461 if (is_date(num, num3, num2, NULL, now, tm))
89967023 462 break;
198b0fb6 463 }
38035cf4
JH
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))
89967023 473 break;
38035cf4
JH
474 /* Funny European mm.dd.yy */
475 if (c == '.' &&
476 is_date(num3, num, num2, refuse_future, now, tm))
198b0fb6
LT
477 break;
478 return 0;
479 }
480 return end - date;
481}
482
36e4986f
LT
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 */
9f2b6d29
LT
488static inline int nodate(struct tm *tm)
489{
36e4986f
LT
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;
9f2b6d29
LT
496}
497
198b0fb6 498/*
a6080a0a 499 * We've seen a digit. Time? Year? Date?
198b0fb6 500 */
26a2d8ae 501static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
198b0fb6
LT
502{
503 int n;
504 char *end;
505 unsigned long num;
506
507 num = strtoul(date, &end, 10);
508
509 /*
a1a5a634
JS
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.
198b0fb6 513 */
9f2b6d29 514 if (num >= 100000000 && nodate(tm)) {
198b0fb6 515 time_t time = num;
9cb480f2
JH
516 if (gmtime_r(&time, tm)) {
517 *tm_gmt = 1;
198b0fb6 518 return end - date;
9cb480f2 519 }
198b0fb6
LT
520 }
521
522 /*
38035cf4 523 * Check for special formats: num[-.:/]num[same]num
198b0fb6
LT
524 */
525 switch (*end) {
526 case ':':
38035cf4 527 case '.':
198b0fb6
LT
528 case '/':
529 case '-':
530 if (isdigit(end[1])) {
073281e2 531 int match = match_multi_number(num, *end, date, end, tm, 0);
198b0fb6
LT
532 if (match)
533 return match;
89967023
LT
534 }
535 }
198b0fb6
LT
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) {
7122f82f 549 if (num <= 1400 && *offset == -1) {
198b0fb6
LT
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
9f2b6d29
LT
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
198b0fb6
LT
565 /*
566 * NOTE! We will give precedence to day-of-month over month or
82f9d58a 567 * year numbers in the 1-12 range. So 05 is always "mday 5",
198b0fb6
LT
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
90290552 589 if (num > 0 && num < 13 && tm->tm_mon < 0)
198b0fb6 590 tm->tm_mon = num-1;
a6080a0a 591
198b0fb6 592 return n;
89967023 593}
ecee9d9e 594
26a2d8ae 595static int match_tz(const char *date, int *offp)
89967023
LT
596{
597 char *end;
ee646eb4
HL
598 int hour = strtoul(date + 1, &end, 10);
599 int n = end - (date + 1);
600 int min = 0;
ecee9d9e 601
ee646eb4
HL
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" */
ecee9d9e 614
198b0fb6 615 /*
ee646eb4
HL
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)
198b0fb6 622 */
ee646eb4
HL
623 if (min < 60 && hour < 24) {
624 int offset = hour * 60 + min;
68849b54
LT
625 if (*date == '-')
626 offset = -offset;
68849b54
LT
627 *offp = offset;
628 }
89967023
LT
629 return end - date;
630}
ecee9d9e 631
c33ddc2e 632static void date_string(unsigned long date, int offset, struct strbuf *buf)
01c6ad29
LT
633{
634 int sign = '+';
635
636 if (offset < 0) {
637 offset = -offset;
638 sign = '-';
639 }
c33ddc2e 640 strbuf_addf(buf, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
01c6ad29
LT
641}
642
116eb3ab
JH
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 */
647static 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
be21d167 653 if (*date < '0' || '9' < *date)
116eb3ab
JH
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
89967023
LT
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. */
9644c061 672int parse_date_basic(const char *date, unsigned long *timestamp, int *offset)
89967023
LT
673{
674 struct tm tm;
c5043cc1
RR
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;
ecee9d9e 683
89967023
LT
684 memset(&tm, 0, sizeof(tm));
685 tm.tm_year = -1;
686 tm.tm_mon = -1;
687 tm.tm_mday = -1;
eaa85129 688 tm.tm_isdst = -1;
36e4986f
LT
689 tm.tm_hour = -1;
690 tm.tm_min = -1;
691 tm.tm_sec = -1;
c5043cc1 692 *offset = -1;
9cb480f2 693 tm_gmt = 0;
89967023 694
2c733fb2
JH
695 if (*date == '@' &&
696 !match_object_header_date(date + 1, timestamp, offset))
116eb3ab 697 return 0; /* success */
89967023
LT
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))
c5043cc1 707 match = match_alpha(date, &tm, offset);
89967023 708 else if (isdigit(c))
c5043cc1 709 match = match_digit(date, &tm, offset, &tm_gmt);
89967023 710 else if ((c == '-' || c == '+') && isdigit(date[1]))
c5043cc1 711 match = match_tz(date, offset);
89967023
LT
712
713 if (!match) {
714 /* BAD CRAP */
715 match = 1;
a6080a0a 716 }
89967023
LT
717
718 date += match;
719 }
ecee9d9e 720
f6e63621 721 /* do not use mktime(), which uses local timezone, here */
c5043cc1 722 *timestamp = tm_to_time_t(&tm);
7fcec48d
JH
723 if (*timestamp == -1)
724 return -1;
725
e1033da6 726 if (*offset == -1) {
f6e63621
JH
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);
e1033da6
MG
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 }
eaa85129 738
9cb480f2 739 if (!tm_gmt)
c5043cc1 740 *timestamp -= *offset * 60;
9644c061 741 return 0; /* success */
c5043cc1
RR
742}
743
3d27b9b0
JH
744int 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
c33ddc2e 766int parse_date(const char *date, struct strbuf *result)
c5043cc1
RR
767{
768 unsigned long timestamp;
769 int offset;
9644c061 770 if (parse_date_basic(date, &timestamp, &offset))
c5043cc1 771 return -1;
c33ddc2e
JK
772 date_string(timestamp, offset, result);
773 return 0;
ecee9d9e
ET
774}
775
add00ba2
JK
776static 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
a5481a6c 801void parse_date_format(const char *format, struct date_mode *mode)
856665f8 802{
add00ba2
JK
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)
856665f8
AP
820 die("unknown date format %s", format);
821}
822
c33ddc2e 823void datestamp(struct strbuf *out)
ecee9d9e
ET
824{
825 time_t now;
826 int offset;
827
828 time(&now);
829
bb5799d6 830 offset = tm_to_time_t(localtime(&now)) - now;
ecee9d9e
ET
831 offset /= 60;
832
c33ddc2e 833 date_string(now, offset, out);
ecee9d9e 834}
3c07b1d1 835
90290552
LT
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 */
840static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec)
3c07b1d1 841{
90290552
LT
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;
3c07b1d1 855 localtime_r(&n, tm);
90290552 856 return n;
3c07b1d1
LT
857}
858
93cfa7c7
JH
859static void date_now(struct tm *tm, struct tm *now, int *num)
860{
861 update_tm(tm, now, 0);
862}
863
90290552 864static void date_yesterday(struct tm *tm, struct tm *now, int *num)
a8aca418 865{
90290552 866 update_tm(tm, now, 24*60*60);
a8aca418
LT
867}
868
90290552 869static void date_time(struct tm *tm, struct tm *now, int hour)
a8aca418
LT
870{
871 if (tm->tm_hour < hour)
90290552 872 date_yesterday(tm, now, NULL);
a8aca418
LT
873 tm->tm_hour = hour;
874 tm->tm_min = 0;
875 tm->tm_sec = 0;
876}
877
90290552 878static void date_midnight(struct tm *tm, struct tm *now, int *num)
a8aca418 879{
90290552 880 date_time(tm, now, 0);
a8aca418
LT
881}
882
90290552 883static void date_noon(struct tm *tm, struct tm *now, int *num)
a8aca418 884{
90290552 885 date_time(tm, now, 12);
a8aca418
LT
886}
887
90290552 888static void date_tea(struct tm *tm, struct tm *now, int *num)
a8aca418 889{
90290552 890 date_time(tm, now, 17);
a8aca418
LT
891}
892
90290552 893static void date_pm(struct tm *tm, struct tm *now, int *num)
393d340e 894{
18b633ca 895 int hour, n = *num;
393d340e
LT
896 *num = 0;
897
18b633ca
LT
898 hour = tm->tm_hour;
899 if (n) {
900 hour = n;
393d340e
LT
901 tm->tm_min = 0;
902 tm->tm_sec = 0;
903 }
18b633ca 904 tm->tm_hour = (hour % 12) + 12;
393d340e
LT
905}
906
90290552 907static void date_am(struct tm *tm, struct tm *now, int *num)
393d340e 908{
18b633ca 909 int hour, n = *num;
393d340e
LT
910 *num = 0;
911
18b633ca
LT
912 hour = tm->tm_hour;
913 if (n) {
914 hour = n;
393d340e
LT
915 tm->tm_min = 0;
916 tm->tm_sec = 0;
917 }
18b633ca 918 tm->tm_hour = (hour % 12);
393d340e
LT
919}
920
90290552 921static void date_never(struct tm *tm, struct tm *now, int *num)
af66366a 922{
8c6b5786
OM
923 time_t n = 0;
924 localtime_r(&n, tm);
af66366a
JS
925}
926
a8aca418
LT
927static const struct special {
928 const char *name;
90290552 929 void (*fn)(struct tm *, struct tm *, int *);
a8aca418
LT
930} special[] = {
931 { "yesterday", date_yesterday },
932 { "noon", date_noon },
933 { "midnight", date_midnight },
934 { "tea", date_tea },
393d340e
LT
935 { "PM", date_pm },
936 { "AM", date_am },
af66366a 937 { "never", date_never },
93cfa7c7 938 { "now", date_now },
a8aca418
LT
939 { NULL }
940};
941
3c07b1d1
LT
942static const char *number_name[] = {
943 "zero", "one", "two", "three", "four",
944 "five", "six", "seven", "eight", "nine", "ten",
945};
946
a8aca418 947static const struct typelen {
3c07b1d1
LT
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 }
a6080a0a 957};
3c07b1d1 958
93cfa7c7 959static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched)
3c07b1d1 960{
a8aca418
LT
961 const struct typelen *tl;
962 const struct special *s;
3c07b1d1 963 const char *end = date;
5df7dbba 964 int i;
3c07b1d1 965
38db01b7 966 while (isalpha(*++end))
5df7dbba 967 ;
3c07b1d1
LT
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;
93cfa7c7 973 *touched = 1;
3c07b1d1
LT
974 return end;
975 }
976 }
977
a8aca418
LT
978 for (s = special; s->name; s++) {
979 int len = strlen(s->name);
980 if (match_string(date, s->name) == len) {
90290552 981 s->fn(tm, now, num);
93cfa7c7 982 *touched = 1;
a8aca418
LT
983 return end;
984 }
3c07b1d1
LT
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;
93cfa7c7 992 *touched = 1;
3c07b1d1
LT
993 return end;
994 }
995 }
93cfa7c7 996 if (match_string(date, "last") == 4) {
3c07b1d1 997 *num = 1;
93cfa7c7
JH
998 *touched = 1;
999 }
3c07b1d1
LT
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) {
90290552 1007 update_tm(tm, now, tl->length * *num);
3c07b1d1 1008 *num = 0;
93cfa7c7 1009 *touched = 1;
3c07b1d1
LT
1010 return end;
1011 }
1012 tl++;
1013 }
1014
6b7b0427
LT
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
90290552 1026 update_tm(tm, now, diff * 24 * 60 * 60);
93cfa7c7 1027 *touched = 1;
6b7b0427
LT
1028 return end;
1029 }
1030 }
1031
3c07b1d1 1032 if (match_string(date, "months") >= 5) {
931e8e27
JK
1033 int n;
1034 update_tm(tm, now, 0); /* fill in date fields if needed */
1035 n = tm->tm_mon - *num;
3c07b1d1
LT
1036 *num = 0;
1037 while (n < 0) {
1038 n += 12;
1039 tm->tm_year--;
1040 }
1041 tm->tm_mon = n;
93cfa7c7 1042 *touched = 1;
3c07b1d1
LT
1043 return end;
1044 }
1045
1046 if (match_string(date, "years") >= 4) {
931e8e27 1047 update_tm(tm, now, 0); /* fill in date fields if needed */
3c07b1d1
LT
1048 tm->tm_year -= *num;
1049 *num = 0;
93cfa7c7 1050 *touched = 1;
3c07b1d1
LT
1051 return end;
1052 }
1053
1054 return end;
1055}
1056
073281e2
JK
1057static const char *approxidate_digit(const char *date, struct tm *tm, int *num,
1058 time_t now)
e92a54d9
LT
1059{
1060 char *end;
1061 unsigned long number = strtoul(date, &end, 10);
1062
393d340e
LT
1063 switch (*end) {
1064 case ':':
1065 case '.':
1066 case '/':
1067 case '-':
1068 if (isdigit(end[1])) {
073281e2
JK
1069 int match = match_multi_number(number, *end, date, end,
1070 tm, now);
393d340e
LT
1071 if (match)
1072 return date + match;
1073 }
1074 }
1075
9f2b6d29
LT
1076 /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
1077 if (date[0] != '0' || end - date <= 2)
1078 *num = number;
e92a54d9
LT
1079 return end;
1080}
1081
90290552
LT
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 */
1087static 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;
36e4986f
LT
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 }
90290552
LT
1106 }
1107}
1108
93cfa7c7
JH
1109static unsigned long approxidate_str(const char *date,
1110 const struct timeval *tv,
1111 int *error_ret)
3c07b1d1
LT
1112{
1113 int number = 0;
93cfa7c7 1114 int touched = 0;
3c07b1d1 1115 struct tm tm, now;
f697b33b 1116 time_t time_sec;
3c07b1d1 1117
33012fc4 1118 time_sec = tv->tv_sec;
f697b33b 1119 localtime_r(&time_sec, &tm);
3c07b1d1 1120 now = tm;
90290552
LT
1121
1122 tm.tm_year = -1;
1123 tm.tm_mon = -1;
1124 tm.tm_mday = -1;
1125
3c07b1d1
LT
1126 for (;;) {
1127 unsigned char c = *date;
1128 if (!c)
1129 break;
1130 date++;
1131 if (isdigit(c)) {
90290552 1132 pending_number(&tm, &number);
073281e2 1133 date = approxidate_digit(date-1, &tm, &number, time_sec);
93cfa7c7 1134 touched = 1;
3c07b1d1
LT
1135 continue;
1136 }
1137 if (isalpha(c))
93cfa7c7 1138 date = approxidate_alpha(date-1, &tm, &now, &number, &touched);
3c07b1d1 1139 }
90290552 1140 pending_number(&tm, &number);
93cfa7c7
JH
1141 if (!touched)
1142 *error_ret = 1;
90290552 1143 return update_tm(&tm, &now, 0);
3c07b1d1 1144}
33012fc4
AR
1145
1146unsigned long approxidate_relative(const char *date, const struct timeval *tv)
1147{
c5043cc1
RR
1148 unsigned long timestamp;
1149 int offset;
93cfa7c7 1150 int errors = 0;
33012fc4 1151
9644c061 1152 if (!parse_date_basic(date, &timestamp, &offset))
c5043cc1 1153 return timestamp;
93cfa7c7 1154 return approxidate_str(date, tv, &errors);
33012fc4
AR
1155}
1156
93cfa7c7 1157unsigned long approxidate_careful(const char *date, int *error_ret)
33012fc4
AR
1158{
1159 struct timeval tv;
c5043cc1
RR
1160 unsigned long timestamp;
1161 int offset;
93cfa7c7
JH
1162 int dummy = 0;
1163 if (!error_ret)
1164 error_ret = &dummy;
33012fc4 1165
9644c061 1166 if (!parse_date_basic(date, &timestamp, &offset)) {
93cfa7c7 1167 *error_ret = 0;
c5043cc1 1168 return timestamp;
93cfa7c7 1169 }
33012fc4
AR
1170
1171 gettimeofday(&tv, NULL);
93cfa7c7 1172 return approxidate_str(date, &tv, error_ret);
33012fc4 1173}
7ca36d93
JK
1174
1175int 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}