Git 1.6.5.8
[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 */
12time_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
JH
76
77 if (t_local < t) {
78 eastwest = -1;
79 offset = t - t_local;
80 } else {
81 eastwest = 1;
82 offset = t_local - t;
83 }
84 offset /= 60; /* in minutes */
85 offset = (offset % 60) + ((offset / 60) * 100);
86 return offset * eastwest;
87}
88
33012fc4
AR
89const char *show_date_relative(unsigned long time, int tz,
90 const struct timeval *now,
91 char *timebuf,
92 size_t timebuf_size)
93{
94 unsigned long diff;
95 if (now->tv_sec < time)
96 return "in the future";
97 diff = now->tv_sec - time;
98 if (diff < 90) {
99 snprintf(timebuf, timebuf_size, "%lu seconds ago", diff);
100 return timebuf;
101 }
102 /* Turn it into minutes */
103 diff = (diff + 30) / 60;
104 if (diff < 90) {
105 snprintf(timebuf, timebuf_size, "%lu minutes ago", diff);
106 return timebuf;
107 }
108 /* Turn it into hours */
109 diff = (diff + 30) / 60;
110 if (diff < 36) {
111 snprintf(timebuf, timebuf_size, "%lu hours ago", diff);
112 return timebuf;
113 }
114 /* We deal with number of days from here on */
115 diff = (diff + 12) / 24;
116 if (diff < 14) {
117 snprintf(timebuf, timebuf_size, "%lu days ago", diff);
118 return timebuf;
119 }
120 /* Say weeks for the past 10 weeks or so */
121 if (diff < 70) {
122 snprintf(timebuf, timebuf_size, "%lu weeks ago", (diff + 3) / 7);
123 return timebuf;
124 }
125 /* Say months for the past 12 months or so */
dbc1b1f7 126 if (diff < 365) {
33012fc4
AR
127 snprintf(timebuf, timebuf_size, "%lu months ago", (diff + 15) / 30);
128 return timebuf;
129 }
130 /* Give years and months for 5 years or so */
131 if (diff < 1825) {
132 unsigned long years = diff / 365;
133 unsigned long months = (diff % 365 + 15) / 30;
134 int n;
135 n = snprintf(timebuf, timebuf_size, "%lu year%s",
136 years, (years > 1 ? "s" : ""));
137 if (months)
138 snprintf(timebuf + n, timebuf_size - n,
139 ", %lu month%s ago",
140 months, (months > 1 ? "s" : ""));
141 else
142 snprintf(timebuf + n, timebuf_size - n, " ago");
143 return timebuf;
144 }
145 /* Otherwise, just years. Centuries is probably overkill. */
146 snprintf(timebuf, timebuf_size, "%lu years ago", (diff + 183) / 365);
147 return timebuf;
148}
149
f8493ec0 150const char *show_date(unsigned long time, int tz, enum date_mode mode)
2a387043
JH
151{
152 struct tm *tm;
153 static char timebuf[200];
154
7dff9b30
LT
155 if (mode == DATE_RAW) {
156 snprintf(timebuf, sizeof(timebuf), "%lu %+05d", time, tz);
157 return timebuf;
158 }
159
f8493ec0 160 if (mode == DATE_RELATIVE) {
9a8e35e9
LT
161 struct timeval now;
162 gettimeofday(&now, NULL);
33012fc4
AR
163 return show_date_relative(time, tz, &now,
164 timebuf, sizeof(timebuf));
9a8e35e9
LT
165 }
166
a7b02ccf
JH
167 if (mode == DATE_LOCAL)
168 tz = local_tzoffset(time);
169
2a387043 170 tm = time_to_tm(time, tz);
f80cd783
LT
171 if (!tm)
172 return NULL;
f8493ec0
JS
173 if (mode == DATE_SHORT)
174 sprintf(timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
175 tm->tm_mon + 1, tm->tm_mday);
ee8f838e
RR
176 else if (mode == DATE_ISO8601)
177 sprintf(timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
178 tm->tm_year + 1900,
179 tm->tm_mon + 1,
180 tm->tm_mday,
181 tm->tm_hour, tm->tm_min, tm->tm_sec,
182 tz);
73013afd
JH
183 else if (mode == DATE_RFC2822)
184 sprintf(timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
185 weekday_names[tm->tm_wday], tm->tm_mday,
186 month_names[tm->tm_mon], tm->tm_year + 1900,
187 tm->tm_hour, tm->tm_min, tm->tm_sec, tz);
f8493ec0 188 else
a7b02ccf 189 sprintf(timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d",
f8493ec0
JS
190 weekday_names[tm->tm_wday],
191 month_names[tm->tm_mon],
192 tm->tm_mday,
193 tm->tm_hour, tm->tm_min, tm->tm_sec,
a7b02ccf
JH
194 tm->tm_year + 1900,
195 (mode == DATE_LOCAL) ? 0 : ' ',
196 tz);
f80cd783
LT
197 return timebuf;
198}
199
89967023
LT
200/*
201 * Check these. And note how it doesn't do the summer-time conversion.
202 *
203 * In my world, it's always summer, and things are probably a bit off
204 * in other ways too.
205 */
206static const struct {
207 const char *name;
208 int offset;
5e2a78a4 209 int dst;
89967023 210} timezone_names[] = {
5e2a78a4
LT
211 { "IDLW", -12, 0, }, /* International Date Line West */
212 { "NT", -11, 0, }, /* Nome */
213 { "CAT", -10, 0, }, /* Central Alaska */
214 { "HST", -10, 0, }, /* Hawaii Standard */
215 { "HDT", -10, 1, }, /* Hawaii Daylight */
216 { "YST", -9, 0, }, /* Yukon Standard */
217 { "YDT", -9, 1, }, /* Yukon Daylight */
218 { "PST", -8, 0, }, /* Pacific Standard */
219 { "PDT", -8, 1, }, /* Pacific Daylight */
220 { "MST", -7, 0, }, /* Mountain Standard */
221 { "MDT", -7, 1, }, /* Mountain Daylight */
222 { "CST", -6, 0, }, /* Central Standard */
223 { "CDT", -6, 1, }, /* Central Daylight */
224 { "EST", -5, 0, }, /* Eastern Standard */
225 { "EDT", -5, 1, }, /* Eastern Daylight */
226 { "AST", -3, 0, }, /* Atlantic Standard */
227 { "ADT", -3, 1, }, /* Atlantic Daylight */
228 { "WAT", -1, 0, }, /* West Africa */
229
230 { "GMT", 0, 0, }, /* Greenwich Mean */
231 { "UTC", 0, 0, }, /* Universal (Coordinated) */
232
233 { "WET", 0, 0, }, /* Western European */
234 { "BST", 0, 1, }, /* British Summer */
235 { "CET", +1, 0, }, /* Central European */
236 { "MET", +1, 0, }, /* Middle European */
237 { "MEWT", +1, 0, }, /* Middle European Winter */
238 { "MEST", +1, 1, }, /* Middle European Summer */
239 { "CEST", +1, 1, }, /* Central European Summer */
240 { "MESZ", +1, 1, }, /* Middle European Summer */
241 { "FWT", +1, 0, }, /* French Winter */
242 { "FST", +1, 1, }, /* French Summer */
243 { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
92e2311b 244 { "EEST", +2, 1, }, /* Eastern European Daylight */
5e2a78a4
LT
245 { "WAST", +7, 0, }, /* West Australian Standard */
246 { "WADT", +7, 1, }, /* West Australian Daylight */
247 { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
248 { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
249 { "EAST", +10, 0, }, /* Eastern Australian Standard */
250 { "EADT", +10, 1, }, /* Eastern Australian Daylight */
251 { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
695ed472
SD
252 { "NZT", +12, 0, }, /* New Zealand */
253 { "NZST", +12, 0, }, /* New Zealand Standard */
254 { "NZDT", +12, 1, }, /* New Zealand Daylight */
5e2a78a4 255 { "IDLE", +12, 0, }, /* International Date Line East */
89967023 256};
ecee9d9e 257
89967023 258static int match_string(const char *date, const char *str)
ecee9d9e 259{
89967023
LT
260 int i = 0;
261
262 for (i = 0; *date; date++, str++, i++) {
263 if (*date == *str)
264 continue;
265 if (toupper(*date) == toupper(*str))
266 continue;
267 if (!isalnum(*date))
268 break;
269 return 0;
270 }
271 return i;
ecee9d9e
ET
272}
273
68849b54
LT
274static int skip_alpha(const char *date)
275{
276 int i = 0;
277 do {
278 i++;
279 } while (isalpha(date[i]));
280 return i;
281}
282
89967023
LT
283/*
284* Parse month, weekday, or timezone name
285*/
286static int match_alpha(const char *date, struct tm *tm, int *offset)
ecee9d9e 287{
89967023 288 int i;
ecee9d9e 289
89967023
LT
290 for (i = 0; i < 12; i++) {
291 int match = match_string(date, month_names[i]);
292 if (match >= 3) {
293 tm->tm_mon = i;
294 return match;
ecee9d9e 295 }
89967023 296 }
ecee9d9e 297
89967023
LT
298 for (i = 0; i < 7; i++) {
299 int match = match_string(date, weekday_names[i]);
300 if (match >= 3) {
301 tm->tm_wday = i;
302 return match;
303 }
304 }
ecee9d9e 305
b4f2a6ac 306 for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
89967023
LT
307 int match = match_string(date, timezone_names[i].name);
308 if (match >= 3) {
5e2a78a4
LT
309 int off = timezone_names[i].offset;
310
311 /* This is bogus, but we like summer */
312 off += timezone_names[i].dst;
313
92e2311b
LT
314 /* Only use the tz name offset if we don't have anything better */
315 if (*offset == -1)
316 *offset = 60*off;
317
89967023 318 return match;
ecee9d9e
ET
319 }
320 }
ecee9d9e 321
68849b54 322 if (match_string(date, "PM") == 2) {
18b633ca
LT
323 tm->tm_hour = (tm->tm_hour % 12) + 12;
324 return 2;
325 }
326
327 if (match_string(date, "AM") == 2) {
328 tm->tm_hour = (tm->tm_hour % 12) + 0;
68849b54
LT
329 return 2;
330 }
331
89967023 332 /* BAD CRAP */
68849b54 333 return skip_alpha(date);
89967023 334}
ecee9d9e 335
38035cf4 336static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
89967023 337{
198b0fb6 338 if (month > 0 && month < 13 && day > 0 && day < 32) {
38035cf4
JH
339 struct tm check = *tm;
340 struct tm *r = (now_tm ? &check : tm);
341 time_t specified;
342
343 r->tm_mon = month - 1;
344 r->tm_mday = day;
198b0fb6 345 if (year == -1) {
38035cf4
JH
346 if (!now_tm)
347 return 1;
348 r->tm_year = now_tm->tm_year;
89967023 349 }
38035cf4
JH
350 else if (year >= 1970 && year < 2100)
351 r->tm_year = year - 1900;
352 else if (year > 70 && year < 100)
353 r->tm_year = year;
354 else if (year < 38)
355 r->tm_year = year + 100;
356 else
198b0fb6 357 return 0;
38035cf4
JH
358 if (!now_tm)
359 return 1;
360
bb5799d6 361 specified = tm_to_time_t(r);
198b0fb6 362
38035cf4
JH
363 /* Be it commit time or author time, it does not make
364 * sense to specify timestamp way into the future. Make
365 * sure it is not later than ten days from now...
366 */
367 if (now + 10*24*3600 < specified)
368 return 0;
369 tm->tm_mon = r->tm_mon;
370 tm->tm_mday = r->tm_mday;
371 if (year != -1)
372 tm->tm_year = r->tm_year;
198b0fb6 373 return 1;
89967023 374 }
198b0fb6
LT
375 return 0;
376}
ecee9d9e 377
26a2d8ae 378static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm)
198b0fb6 379{
38035cf4
JH
380 time_t now;
381 struct tm now_tm;
382 struct tm *refuse_future;
198b0fb6
LT
383 long num2, num3;
384
385 num2 = strtol(end+1, &end, 10);
386 num3 = -1;
387 if (*end == c && isdigit(end[1]))
388 num3 = strtol(end+1, &end, 10);
389
390 /* Time? Date? */
89967023 391 switch (c) {
198b0fb6
LT
392 case ':':
393 if (num3 < 0)
394 num3 = 0;
395 if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
396 tm->tm_hour = num;
397 tm->tm_min = num2;
398 tm->tm_sec = num3;
89967023
LT
399 break;
400 }
198b0fb6 401 return 0;
89967023
LT
402
403 case '-':
404 case '/':
38035cf4
JH
405 case '.':
406 now = time(NULL);
407 refuse_future = NULL;
408 if (gmtime_r(&now, &now_tm))
409 refuse_future = &now_tm;
410
198b0fb6
LT
411 if (num > 70) {
412 /* yyyy-mm-dd? */
38035cf4 413 if (is_date(num, num2, num3, refuse_future, now, tm))
198b0fb6
LT
414 break;
415 /* yyyy-dd-mm? */
38035cf4 416 if (is_date(num, num3, num2, refuse_future, now, tm))
89967023 417 break;
198b0fb6 418 }
38035cf4
JH
419 /* Our eastern European friends say dd.mm.yy[yy]
420 * is the norm there, so giving precedence to
421 * mm/dd/yy[yy] form only when separator is not '.'
422 */
423 if (c != '.' &&
424 is_date(num3, num, num2, refuse_future, now, tm))
425 break;
426 /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
427 if (is_date(num3, num2, num, refuse_future, now, tm))
89967023 428 break;
38035cf4
JH
429 /* Funny European mm.dd.yy */
430 if (c == '.' &&
431 is_date(num3, num, num2, refuse_future, now, tm))
198b0fb6
LT
432 break;
433 return 0;
434 }
435 return end - date;
436}
437
36e4986f
LT
438/*
439 * Have we filled in any part of the time/date yet?
440 * We just do a binary 'and' to see if the sign bit
441 * is set in all the values.
442 */
9f2b6d29
LT
443static inline int nodate(struct tm *tm)
444{
36e4986f
LT
445 return (tm->tm_year &
446 tm->tm_mon &
447 tm->tm_mday &
448 tm->tm_hour &
449 tm->tm_min &
450 tm->tm_sec) < 0;
9f2b6d29
LT
451}
452
198b0fb6 453/*
a6080a0a 454 * We've seen a digit. Time? Year? Date?
198b0fb6 455 */
26a2d8ae 456static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
198b0fb6
LT
457{
458 int n;
459 char *end;
460 unsigned long num;
461
462 num = strtoul(date, &end, 10);
463
464 /*
a1a5a634
JS
465 * Seconds since 1970? We trigger on that for any numbers with
466 * more than 8 digits. This is because we don't want to rule out
467 * numbers like 20070606 as a YYYYMMDD date.
198b0fb6 468 */
9f2b6d29 469 if (num >= 100000000 && nodate(tm)) {
198b0fb6 470 time_t time = num;
9cb480f2
JH
471 if (gmtime_r(&time, tm)) {
472 *tm_gmt = 1;
198b0fb6 473 return end - date;
9cb480f2 474 }
198b0fb6
LT
475 }
476
477 /*
38035cf4 478 * Check for special formats: num[-.:/]num[same]num
198b0fb6
LT
479 */
480 switch (*end) {
481 case ':':
38035cf4 482 case '.':
198b0fb6
LT
483 case '/':
484 case '-':
485 if (isdigit(end[1])) {
486 int match = match_multi_number(num, *end, date, end, tm);
487 if (match)
488 return match;
89967023
LT
489 }
490 }
198b0fb6
LT
491
492 /*
493 * None of the special formats? Try to guess what
494 * the number meant. We use the number of digits
495 * to make a more educated guess..
496 */
497 n = 0;
498 do {
499 n++;
500 } while (isdigit(date[n]));
501
502 /* Four-digit year or a timezone? */
503 if (n == 4) {
7122f82f 504 if (num <= 1400 && *offset == -1) {
198b0fb6
LT
505 unsigned int minutes = num % 100;
506 unsigned int hours = num / 100;
507 *offset = hours*60 + minutes;
508 } else if (num > 1900 && num < 2100)
509 tm->tm_year = num - 1900;
510 return n;
511 }
512
9f2b6d29
LT
513 /*
514 * Ignore lots of numerals. We took care of 4-digit years above.
515 * Days or months must be one or two digits.
516 */
517 if (n > 2)
518 return n;
519
198b0fb6
LT
520 /*
521 * NOTE! We will give precedence to day-of-month over month or
82f9d58a 522 * year numbers in the 1-12 range. So 05 is always "mday 5",
198b0fb6
LT
523 * unless we already have a mday..
524 *
525 * IOW, 01 Apr 05 parses as "April 1st, 2005".
526 */
527 if (num > 0 && num < 32 && tm->tm_mday < 0) {
528 tm->tm_mday = num;
529 return n;
530 }
531
532 /* Two-digit year? */
533 if (n == 2 && tm->tm_year < 0) {
534 if (num < 10 && tm->tm_mday >= 0) {
535 tm->tm_year = num + 100;
536 return n;
537 }
538 if (num >= 70) {
539 tm->tm_year = num;
540 return n;
541 }
542 }
543
90290552 544 if (num > 0 && num < 13 && tm->tm_mon < 0)
198b0fb6 545 tm->tm_mon = num-1;
a6080a0a 546
198b0fb6 547 return n;
89967023 548}
ecee9d9e 549
26a2d8ae 550static int match_tz(const char *date, int *offp)
89967023
LT
551{
552 char *end;
553 int offset = strtoul(date+1, &end, 10);
554 int min, hour;
198b0fb6 555 int n = end - date - 1;
ecee9d9e 556
89967023
LT
557 min = offset % 100;
558 hour = offset / 100;
ecee9d9e 559
198b0fb6
LT
560 /*
561 * Don't accept any random crap.. At least 3 digits, and
562 * a valid minute. We might want to check that the minutes
563 * are divisible by 30 or something too.
564 */
68849b54
LT
565 if (min < 60 && n > 2) {
566 offset = hour*60+min;
567 if (*date == '-')
568 offset = -offset;
ecee9d9e 569
68849b54
LT
570 *offp = offset;
571 }
89967023
LT
572 return end - date;
573}
ecee9d9e 574
01c6ad29
LT
575static int date_string(unsigned long date, int offset, char *buf, int len)
576{
577 int sign = '+';
578
579 if (offset < 0) {
580 offset = -offset;
581 sign = '-';
582 }
583 return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
584}
585
89967023
LT
586/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
587 (i.e. English) day/month names, and it doesn't work correctly with %z. */
2a39064c 588int parse_date(const char *date, char *result, int maxlen)
89967023
LT
589{
590 struct tm tm;
01c6ad29 591 int offset, tm_gmt;
89967023 592 time_t then;
ecee9d9e 593
89967023
LT
594 memset(&tm, 0, sizeof(tm));
595 tm.tm_year = -1;
596 tm.tm_mon = -1;
597 tm.tm_mday = -1;
eaa85129 598 tm.tm_isdst = -1;
36e4986f
LT
599 tm.tm_hour = -1;
600 tm.tm_min = -1;
601 tm.tm_sec = -1;
eaa85129 602 offset = -1;
9cb480f2 603 tm_gmt = 0;
89967023
LT
604
605 for (;;) {
606 int match = 0;
607 unsigned char c = *date;
608
609 /* Stop at end of string or newline */
610 if (!c || c == '\n')
611 break;
612
613 if (isalpha(c))
614 match = match_alpha(date, &tm, &offset);
615 else if (isdigit(c))
9cb480f2 616 match = match_digit(date, &tm, &offset, &tm_gmt);
89967023
LT
617 else if ((c == '-' || c == '+') && isdigit(date[1]))
618 match = match_tz(date, &offset);
619
620 if (!match) {
621 /* BAD CRAP */
622 match = 1;
a6080a0a 623 }
89967023
LT
624
625 date += match;
626 }
ecee9d9e 627
eaa85129 628 /* mktime uses local timezone */
bb5799d6 629 then = tm_to_time_t(&tm);
eaa85129
LT
630 if (offset == -1)
631 offset = (then - mktime(&tm)) / 60;
632
ecee9d9e 633 if (then == -1)
2a39064c 634 return -1;
ecee9d9e 635
9cb480f2
JH
636 if (!tm_gmt)
637 then -= offset * 60;
01c6ad29 638 return date_string(then, offset, result, maxlen);
ecee9d9e
ET
639}
640
856665f8
AP
641enum date_mode parse_date_format(const char *format)
642{
643 if (!strcmp(format, "relative"))
644 return DATE_RELATIVE;
645 else if (!strcmp(format, "iso8601") ||
646 !strcmp(format, "iso"))
647 return DATE_ISO8601;
648 else if (!strcmp(format, "rfc2822") ||
649 !strcmp(format, "rfc"))
650 return DATE_RFC2822;
651 else if (!strcmp(format, "short"))
652 return DATE_SHORT;
653 else if (!strcmp(format, "local"))
654 return DATE_LOCAL;
655 else if (!strcmp(format, "default"))
656 return DATE_NORMAL;
7dff9b30
LT
657 else if (!strcmp(format, "raw"))
658 return DATE_RAW;
856665f8
AP
659 else
660 die("unknown date format %s", format);
661}
662
ecee9d9e
ET
663void datestamp(char *buf, int bufsize)
664{
665 time_t now;
666 int offset;
667
668 time(&now);
669
bb5799d6 670 offset = tm_to_time_t(localtime(&now)) - now;
ecee9d9e
ET
671 offset /= 60;
672
01c6ad29 673 date_string(now, offset, buf, bufsize);
ecee9d9e 674}
3c07b1d1 675
90290552
LT
676/*
677 * Relative time update (eg "2 days ago"). If we haven't set the time
678 * yet, we need to set it from current time.
679 */
680static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec)
3c07b1d1 681{
90290552
LT
682 time_t n;
683
684 if (tm->tm_mday < 0)
685 tm->tm_mday = now->tm_mday;
686 if (tm->tm_mon < 0)
687 tm->tm_mon = now->tm_mon;
688 if (tm->tm_year < 0) {
689 tm->tm_year = now->tm_year;
690 if (tm->tm_mon > now->tm_mon)
691 tm->tm_year--;
692 }
693
694 n = mktime(tm) - sec;
3c07b1d1 695 localtime_r(&n, tm);
90290552 696 return n;
3c07b1d1
LT
697}
698
90290552 699static void date_yesterday(struct tm *tm, struct tm *now, int *num)
a8aca418 700{
90290552 701 update_tm(tm, now, 24*60*60);
a8aca418
LT
702}
703
90290552 704static void date_time(struct tm *tm, struct tm *now, int hour)
a8aca418
LT
705{
706 if (tm->tm_hour < hour)
90290552 707 date_yesterday(tm, now, NULL);
a8aca418
LT
708 tm->tm_hour = hour;
709 tm->tm_min = 0;
710 tm->tm_sec = 0;
711}
712
90290552 713static void date_midnight(struct tm *tm, struct tm *now, int *num)
a8aca418 714{
90290552 715 date_time(tm, now, 0);
a8aca418
LT
716}
717
90290552 718static void date_noon(struct tm *tm, struct tm *now, int *num)
a8aca418 719{
90290552 720 date_time(tm, now, 12);
a8aca418
LT
721}
722
90290552 723static void date_tea(struct tm *tm, struct tm *now, int *num)
a8aca418 724{
90290552 725 date_time(tm, now, 17);
a8aca418
LT
726}
727
90290552 728static void date_pm(struct tm *tm, struct tm *now, int *num)
393d340e 729{
18b633ca 730 int hour, n = *num;
393d340e
LT
731 *num = 0;
732
18b633ca
LT
733 hour = tm->tm_hour;
734 if (n) {
735 hour = n;
393d340e
LT
736 tm->tm_min = 0;
737 tm->tm_sec = 0;
738 }
18b633ca 739 tm->tm_hour = (hour % 12) + 12;
393d340e
LT
740}
741
90290552 742static void date_am(struct tm *tm, struct tm *now, int *num)
393d340e 743{
18b633ca 744 int hour, n = *num;
393d340e
LT
745 *num = 0;
746
18b633ca
LT
747 hour = tm->tm_hour;
748 if (n) {
749 hour = n;
393d340e
LT
750 tm->tm_min = 0;
751 tm->tm_sec = 0;
752 }
18b633ca 753 tm->tm_hour = (hour % 12);
393d340e
LT
754}
755
90290552 756static void date_never(struct tm *tm, struct tm *now, int *num)
af66366a 757{
8c6b5786
OM
758 time_t n = 0;
759 localtime_r(&n, tm);
af66366a
JS
760}
761
a8aca418
LT
762static const struct special {
763 const char *name;
90290552 764 void (*fn)(struct tm *, struct tm *, int *);
a8aca418
LT
765} special[] = {
766 { "yesterday", date_yesterday },
767 { "noon", date_noon },
768 { "midnight", date_midnight },
769 { "tea", date_tea },
393d340e
LT
770 { "PM", date_pm },
771 { "AM", date_am },
af66366a 772 { "never", date_never },
a8aca418
LT
773 { NULL }
774};
775
3c07b1d1
LT
776static const char *number_name[] = {
777 "zero", "one", "two", "three", "four",
778 "five", "six", "seven", "eight", "nine", "ten",
779};
780
a8aca418 781static const struct typelen {
3c07b1d1
LT
782 const char *type;
783 int length;
784} typelen[] = {
785 { "seconds", 1 },
786 { "minutes", 60 },
787 { "hours", 60*60 },
788 { "days", 24*60*60 },
789 { "weeks", 7*24*60*60 },
790 { NULL }
a6080a0a 791};
3c07b1d1 792
90290552 793static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num)
3c07b1d1 794{
a8aca418
LT
795 const struct typelen *tl;
796 const struct special *s;
3c07b1d1 797 const char *end = date;
5df7dbba 798 int i;
3c07b1d1 799
5df7dbba
PH
800 while (isalpha(*++end));
801 ;
3c07b1d1
LT
802
803 for (i = 0; i < 12; i++) {
804 int match = match_string(date, month_names[i]);
805 if (match >= 3) {
806 tm->tm_mon = i;
807 return end;
808 }
809 }
810
a8aca418
LT
811 for (s = special; s->name; s++) {
812 int len = strlen(s->name);
813 if (match_string(date, s->name) == len) {
90290552 814 s->fn(tm, now, num);
a8aca418
LT
815 return end;
816 }
3c07b1d1
LT
817 }
818
819 if (!*num) {
820 for (i = 1; i < 11; i++) {
821 int len = strlen(number_name[i]);
822 if (match_string(date, number_name[i]) == len) {
823 *num = i;
824 return end;
825 }
826 }
827 if (match_string(date, "last") == 4)
828 *num = 1;
829 return end;
830 }
831
832 tl = typelen;
833 while (tl->type) {
834 int len = strlen(tl->type);
835 if (match_string(date, tl->type) >= len-1) {
90290552 836 update_tm(tm, now, tl->length * *num);
3c07b1d1
LT
837 *num = 0;
838 return end;
839 }
840 tl++;
841 }
842
6b7b0427
LT
843 for (i = 0; i < 7; i++) {
844 int match = match_string(date, weekday_names[i]);
845 if (match >= 3) {
846 int diff, n = *num -1;
847 *num = 0;
848
849 diff = tm->tm_wday - i;
850 if (diff <= 0)
851 n++;
852 diff += 7*n;
853
90290552 854 update_tm(tm, now, diff * 24 * 60 * 60);
6b7b0427
LT
855 return end;
856 }
857 }
858
3c07b1d1 859 if (match_string(date, "months") >= 5) {
931e8e27
JK
860 int n;
861 update_tm(tm, now, 0); /* fill in date fields if needed */
862 n = tm->tm_mon - *num;
3c07b1d1
LT
863 *num = 0;
864 while (n < 0) {
865 n += 12;
866 tm->tm_year--;
867 }
868 tm->tm_mon = n;
869 return end;
870 }
871
872 if (match_string(date, "years") >= 4) {
931e8e27 873 update_tm(tm, now, 0); /* fill in date fields if needed */
3c07b1d1
LT
874 tm->tm_year -= *num;
875 *num = 0;
876 return end;
877 }
878
879 return end;
880}
881
e92a54d9
LT
882static const char *approxidate_digit(const char *date, struct tm *tm, int *num)
883{
884 char *end;
885 unsigned long number = strtoul(date, &end, 10);
886
393d340e
LT
887 switch (*end) {
888 case ':':
889 case '.':
890 case '/':
891 case '-':
892 if (isdigit(end[1])) {
893 int match = match_multi_number(number, *end, date, end, tm);
894 if (match)
895 return date + match;
896 }
897 }
898
9f2b6d29
LT
899 /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
900 if (date[0] != '0' || end - date <= 2)
901 *num = number;
e92a54d9
LT
902 return end;
903}
904
90290552
LT
905/*
906 * Do we have a pending number at the end, or when
907 * we see a new one? Let's assume it's a month day,
908 * as in "Dec 6, 1992"
909 */
910static void pending_number(struct tm *tm, int *num)
911{
912 int number = *num;
913
914 if (number) {
915 *num = 0;
916 if (tm->tm_mday < 0 && number < 32)
917 tm->tm_mday = number;
36e4986f
LT
918 else if (tm->tm_mon < 0 && number < 13)
919 tm->tm_mon = number-1;
920 else if (tm->tm_year < 0) {
921 if (number > 1969 && number < 2100)
922 tm->tm_year = number - 1900;
923 else if (number > 69 && number < 100)
924 tm->tm_year = number;
925 else if (number < 38)
926 tm->tm_year = 100 + number;
927 /* We screw up for number = 00 ? */
928 }
90290552
LT
929 }
930}
931
33012fc4 932static unsigned long approxidate_str(const char *date, const struct timeval *tv)
3c07b1d1
LT
933{
934 int number = 0;
935 struct tm tm, now;
f697b33b 936 time_t time_sec;
3c07b1d1 937
33012fc4 938 time_sec = tv->tv_sec;
f697b33b 939 localtime_r(&time_sec, &tm);
3c07b1d1 940 now = tm;
90290552
LT
941
942 tm.tm_year = -1;
943 tm.tm_mon = -1;
944 tm.tm_mday = -1;
945
3c07b1d1
LT
946 for (;;) {
947 unsigned char c = *date;
948 if (!c)
949 break;
950 date++;
951 if (isdigit(c)) {
90290552 952 pending_number(&tm, &number);
e92a54d9 953 date = approxidate_digit(date-1, &tm, &number);
3c07b1d1
LT
954 continue;
955 }
956 if (isalpha(c))
90290552 957 date = approxidate_alpha(date-1, &tm, &now, &number);
3c07b1d1 958 }
90290552
LT
959 pending_number(&tm, &number);
960 return update_tm(&tm, &now, 0);
3c07b1d1 961}
33012fc4
AR
962
963unsigned long approxidate_relative(const char *date, const struct timeval *tv)
964{
965 char buffer[50];
966
967 if (parse_date(date, buffer, sizeof(buffer)) > 0)
968 return strtoul(buffer, NULL, 0);
969
970 return approxidate_str(date, tv);
971}
972
973unsigned long approxidate(const char *date)
974{
975 struct timeval tv;
976 char buffer[50];
977
978 if (parse_date(date, buffer, sizeof(buffer)) > 0)
979 return strtoul(buffer, NULL, 0);
980
981 gettimeofday(&tv, NULL);
982 return approxidate_str(date, &tv);
983}