init_buffer(): Kill buf pointer
[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
ecee9d9e
ET
9static time_t my_mktime(struct tm *tm)
10{
11 static const int mdays[] = {
12 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
13 };
14 int year = tm->tm_year - 70;
15 int month = tm->tm_mon;
16 int day = tm->tm_mday;
17
18 if (year < 0 || year > 129) /* algo only works for 1970-2099 */
19 return -1;
20 if (month < 0 || month > 11) /* array bounds */
21 return -1;
22 if (month < 2 || (year + 2) % 4)
23 day--;
24 return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
25 tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
26}
27
28static const char *month_names[] = {
89967023
LT
29 "January", "February", "March", "April", "May", "June",
30 "July", "August", "September", "October", "November", "December"
ecee9d9e
ET
31};
32
33static const char *weekday_names[] = {
6b7b0427 34 "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
ecee9d9e
ET
35};
36
9a8e35e9
LT
37static time_t gm_time_t(unsigned long time, int tz)
38{
39 int minutes;
40
41 minutes = tz < 0 ? -tz : tz;
42 minutes = (minutes / 100)*60 + (minutes % 100);
43 minutes = tz < 0 ? -minutes : minutes;
44 return time + minutes * 60;
45}
46
f80cd783
LT
47/*
48 * The "tz" thing is passed in as this strange "decimal parse of tz"
49 * thing, which means that tz -0100 is passed in as the integer -100,
50 * even though it means "sixty minutes off"
51 */
2a387043 52static struct tm *time_to_tm(unsigned long time, int tz)
f80cd783 53{
9a8e35e9 54 time_t t = gm_time_t(time, tz);
2a387043
JH
55 return gmtime(&t);
56}
57
f8493ec0 58const char *show_date(unsigned long time, int tz, enum date_mode mode)
2a387043
JH
59{
60 struct tm *tm;
61 static char timebuf[200];
62
f8493ec0 63 if (mode == DATE_RELATIVE) {
9a8e35e9 64 unsigned long diff;
9a8e35e9
LT
65 struct timeval now;
66 gettimeofday(&now, NULL);
da8f070c 67 if (now.tv_sec < time)
9a8e35e9 68 return "in the future";
da8f070c 69 diff = now.tv_sec - time;
9a8e35e9
LT
70 if (diff < 90) {
71 snprintf(timebuf, sizeof(timebuf), "%lu seconds ago", diff);
72 return timebuf;
73 }
74 /* Turn it into minutes */
75 diff = (diff + 30) / 60;
76 if (diff < 90) {
77 snprintf(timebuf, sizeof(timebuf), "%lu minutes ago", diff);
78 return timebuf;
79 }
80 /* Turn it into hours */
81 diff = (diff + 30) / 60;
82 if (diff < 36) {
83 snprintf(timebuf, sizeof(timebuf), "%lu hours ago", diff);
84 return timebuf;
85 }
86 /* We deal with number of days from here on */
87 diff = (diff + 12) / 24;
88 if (diff < 14) {
89 snprintf(timebuf, sizeof(timebuf), "%lu days ago", diff);
90 return timebuf;
91 }
92 /* Say weeks for the past 10 weeks or so */
93 if (diff < 70) {
94 snprintf(timebuf, sizeof(timebuf), "%lu weeks ago", (diff + 3) / 7);
95 return timebuf;
96 }
97 /* Say months for the past 12 months or so */
98 if (diff < 360) {
99 snprintf(timebuf, sizeof(timebuf), "%lu months ago", (diff + 15) / 30);
100 return timebuf;
101 }
102 /* Else fall back on absolute format.. */
103 }
104
2a387043 105 tm = time_to_tm(time, tz);
f80cd783
LT
106 if (!tm)
107 return NULL;
f8493ec0
JS
108 if (mode == DATE_SHORT)
109 sprintf(timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
110 tm->tm_mon + 1, tm->tm_mday);
111 else
112 sprintf(timebuf, "%.3s %.3s %d %02d:%02d:%02d %d %+05d",
113 weekday_names[tm->tm_wday],
114 month_names[tm->tm_mon],
115 tm->tm_mday,
116 tm->tm_hour, tm->tm_min, tm->tm_sec,
117 tm->tm_year + 1900, tz);
f80cd783
LT
118 return timebuf;
119}
120
2a387043
JH
121const char *show_rfc2822_date(unsigned long time, int tz)
122{
123 struct tm *tm;
124 static char timebuf[200];
125
126 tm = time_to_tm(time, tz);
127 if (!tm)
128 return NULL;
129 sprintf(timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
130 weekday_names[tm->tm_wday], tm->tm_mday,
131 month_names[tm->tm_mon], tm->tm_year + 1900,
132 tm->tm_hour, tm->tm_min, tm->tm_sec, tz);
133 return timebuf;
134}
135
89967023
LT
136/*
137 * Check these. And note how it doesn't do the summer-time conversion.
138 *
139 * In my world, it's always summer, and things are probably a bit off
140 * in other ways too.
141 */
142static const struct {
143 const char *name;
144 int offset;
5e2a78a4 145 int dst;
89967023 146} timezone_names[] = {
5e2a78a4
LT
147 { "IDLW", -12, 0, }, /* International Date Line West */
148 { "NT", -11, 0, }, /* Nome */
149 { "CAT", -10, 0, }, /* Central Alaska */
150 { "HST", -10, 0, }, /* Hawaii Standard */
151 { "HDT", -10, 1, }, /* Hawaii Daylight */
152 { "YST", -9, 0, }, /* Yukon Standard */
153 { "YDT", -9, 1, }, /* Yukon Daylight */
154 { "PST", -8, 0, }, /* Pacific Standard */
155 { "PDT", -8, 1, }, /* Pacific Daylight */
156 { "MST", -7, 0, }, /* Mountain Standard */
157 { "MDT", -7, 1, }, /* Mountain Daylight */
158 { "CST", -6, 0, }, /* Central Standard */
159 { "CDT", -6, 1, }, /* Central Daylight */
160 { "EST", -5, 0, }, /* Eastern Standard */
161 { "EDT", -5, 1, }, /* Eastern Daylight */
162 { "AST", -3, 0, }, /* Atlantic Standard */
163 { "ADT", -3, 1, }, /* Atlantic Daylight */
164 { "WAT", -1, 0, }, /* West Africa */
165
166 { "GMT", 0, 0, }, /* Greenwich Mean */
167 { "UTC", 0, 0, }, /* Universal (Coordinated) */
168
169 { "WET", 0, 0, }, /* Western European */
170 { "BST", 0, 1, }, /* British Summer */
171 { "CET", +1, 0, }, /* Central European */
172 { "MET", +1, 0, }, /* Middle European */
173 { "MEWT", +1, 0, }, /* Middle European Winter */
174 { "MEST", +1, 1, }, /* Middle European Summer */
175 { "CEST", +1, 1, }, /* Central European Summer */
176 { "MESZ", +1, 1, }, /* Middle European Summer */
177 { "FWT", +1, 0, }, /* French Winter */
178 { "FST", +1, 1, }, /* French Summer */
179 { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
92e2311b 180 { "EEST", +2, 1, }, /* Eastern European Daylight */
5e2a78a4
LT
181 { "WAST", +7, 0, }, /* West Australian Standard */
182 { "WADT", +7, 1, }, /* West Australian Daylight */
183 { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
184 { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
185 { "EAST", +10, 0, }, /* Eastern Australian Standard */
186 { "EADT", +10, 1, }, /* Eastern Australian Daylight */
187 { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
188 { "NZT", +11, 0, }, /* New Zealand */
189 { "NZST", +11, 0, }, /* New Zealand Standard */
190 { "NZDT", +11, 1, }, /* New Zealand Daylight */
191 { "IDLE", +12, 0, }, /* International Date Line East */
89967023 192};
ecee9d9e 193
89967023 194static int match_string(const char *date, const char *str)
ecee9d9e 195{
89967023
LT
196 int i = 0;
197
198 for (i = 0; *date; date++, str++, i++) {
199 if (*date == *str)
200 continue;
201 if (toupper(*date) == toupper(*str))
202 continue;
203 if (!isalnum(*date))
204 break;
205 return 0;
206 }
207 return i;
ecee9d9e
ET
208}
209
68849b54
LT
210static int skip_alpha(const char *date)
211{
212 int i = 0;
213 do {
214 i++;
215 } while (isalpha(date[i]));
216 return i;
217}
218
89967023
LT
219/*
220* Parse month, weekday, or timezone name
221*/
222static int match_alpha(const char *date, struct tm *tm, int *offset)
ecee9d9e 223{
89967023 224 int i;
ecee9d9e 225
89967023
LT
226 for (i = 0; i < 12; i++) {
227 int match = match_string(date, month_names[i]);
228 if (match >= 3) {
229 tm->tm_mon = i;
230 return match;
ecee9d9e 231 }
89967023 232 }
ecee9d9e 233
89967023
LT
234 for (i = 0; i < 7; i++) {
235 int match = match_string(date, weekday_names[i]);
236 if (match >= 3) {
237 tm->tm_wday = i;
238 return match;
239 }
240 }
ecee9d9e 241
b4f2a6ac 242 for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
89967023
LT
243 int match = match_string(date, timezone_names[i].name);
244 if (match >= 3) {
5e2a78a4
LT
245 int off = timezone_names[i].offset;
246
247 /* This is bogus, but we like summer */
248 off += timezone_names[i].dst;
249
92e2311b
LT
250 /* Only use the tz name offset if we don't have anything better */
251 if (*offset == -1)
252 *offset = 60*off;
253
89967023 254 return match;
ecee9d9e
ET
255 }
256 }
ecee9d9e 257
68849b54 258 if (match_string(date, "PM") == 2) {
18b633ca
LT
259 tm->tm_hour = (tm->tm_hour % 12) + 12;
260 return 2;
261 }
262
263 if (match_string(date, "AM") == 2) {
264 tm->tm_hour = (tm->tm_hour % 12) + 0;
68849b54
LT
265 return 2;
266 }
267
89967023 268 /* BAD CRAP */
68849b54 269 return skip_alpha(date);
89967023 270}
ecee9d9e 271
38035cf4 272static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
89967023 273{
198b0fb6 274 if (month > 0 && month < 13 && day > 0 && day < 32) {
38035cf4
JH
275 struct tm check = *tm;
276 struct tm *r = (now_tm ? &check : tm);
277 time_t specified;
278
279 r->tm_mon = month - 1;
280 r->tm_mday = day;
198b0fb6 281 if (year == -1) {
38035cf4
JH
282 if (!now_tm)
283 return 1;
284 r->tm_year = now_tm->tm_year;
89967023 285 }
38035cf4
JH
286 else if (year >= 1970 && year < 2100)
287 r->tm_year = year - 1900;
288 else if (year > 70 && year < 100)
289 r->tm_year = year;
290 else if (year < 38)
291 r->tm_year = year + 100;
292 else
198b0fb6 293 return 0;
38035cf4
JH
294 if (!now_tm)
295 return 1;
296
297 specified = my_mktime(r);
198b0fb6 298
38035cf4
JH
299 /* Be it commit time or author time, it does not make
300 * sense to specify timestamp way into the future. Make
301 * sure it is not later than ten days from now...
302 */
303 if (now + 10*24*3600 < specified)
304 return 0;
305 tm->tm_mon = r->tm_mon;
306 tm->tm_mday = r->tm_mday;
307 if (year != -1)
308 tm->tm_year = r->tm_year;
198b0fb6 309 return 1;
89967023 310 }
198b0fb6
LT
311 return 0;
312}
ecee9d9e 313
26a2d8ae 314static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm)
198b0fb6 315{
38035cf4
JH
316 time_t now;
317 struct tm now_tm;
318 struct tm *refuse_future;
198b0fb6
LT
319 long num2, num3;
320
321 num2 = strtol(end+1, &end, 10);
322 num3 = -1;
323 if (*end == c && isdigit(end[1]))
324 num3 = strtol(end+1, &end, 10);
325
326 /* Time? Date? */
89967023 327 switch (c) {
198b0fb6
LT
328 case ':':
329 if (num3 < 0)
330 num3 = 0;
331 if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
332 tm->tm_hour = num;
333 tm->tm_min = num2;
334 tm->tm_sec = num3;
89967023
LT
335 break;
336 }
198b0fb6 337 return 0;
89967023
LT
338
339 case '-':
340 case '/':
38035cf4
JH
341 case '.':
342 now = time(NULL);
343 refuse_future = NULL;
344 if (gmtime_r(&now, &now_tm))
345 refuse_future = &now_tm;
346
198b0fb6
LT
347 if (num > 70) {
348 /* yyyy-mm-dd? */
38035cf4 349 if (is_date(num, num2, num3, refuse_future, now, tm))
198b0fb6
LT
350 break;
351 /* yyyy-dd-mm? */
38035cf4 352 if (is_date(num, num3, num2, refuse_future, now, tm))
89967023 353 break;
198b0fb6 354 }
38035cf4
JH
355 /* Our eastern European friends say dd.mm.yy[yy]
356 * is the norm there, so giving precedence to
357 * mm/dd/yy[yy] form only when separator is not '.'
358 */
359 if (c != '.' &&
360 is_date(num3, num, num2, refuse_future, now, tm))
361 break;
362 /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
363 if (is_date(num3, num2, num, refuse_future, now, tm))
89967023 364 break;
38035cf4
JH
365 /* Funny European mm.dd.yy */
366 if (c == '.' &&
367 is_date(num3, num, num2, refuse_future, now, tm))
198b0fb6
LT
368 break;
369 return 0;
370 }
371 return end - date;
372}
373
374/*
375 * We've seen a digit. Time? Year? Date?
376 */
26a2d8ae 377static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
198b0fb6
LT
378{
379 int n;
380 char *end;
381 unsigned long num;
382
383 num = strtoul(date, &end, 10);
384
385 /*
386 * Seconds since 1970? We trigger on that for anything after Jan 1, 2000
387 */
388 if (num > 946684800) {
389 time_t time = num;
9cb480f2
JH
390 if (gmtime_r(&time, tm)) {
391 *tm_gmt = 1;
198b0fb6 392 return end - date;
9cb480f2 393 }
198b0fb6
LT
394 }
395
396 /*
38035cf4 397 * Check for special formats: num[-.:/]num[same]num
198b0fb6
LT
398 */
399 switch (*end) {
400 case ':':
38035cf4 401 case '.':
198b0fb6
LT
402 case '/':
403 case '-':
404 if (isdigit(end[1])) {
405 int match = match_multi_number(num, *end, date, end, tm);
406 if (match)
407 return match;
89967023
LT
408 }
409 }
198b0fb6
LT
410
411 /*
412 * None of the special formats? Try to guess what
413 * the number meant. We use the number of digits
414 * to make a more educated guess..
415 */
416 n = 0;
417 do {
418 n++;
419 } while (isdigit(date[n]));
420
421 /* Four-digit year or a timezone? */
422 if (n == 4) {
7122f82f 423 if (num <= 1400 && *offset == -1) {
198b0fb6
LT
424 unsigned int minutes = num % 100;
425 unsigned int hours = num / 100;
426 *offset = hours*60 + minutes;
427 } else if (num > 1900 && num < 2100)
428 tm->tm_year = num - 1900;
429 return n;
430 }
431
432 /*
433 * NOTE! We will give precedence to day-of-month over month or
82f9d58a 434 * year numbers in the 1-12 range. So 05 is always "mday 5",
198b0fb6
LT
435 * unless we already have a mday..
436 *
437 * IOW, 01 Apr 05 parses as "April 1st, 2005".
438 */
439 if (num > 0 && num < 32 && tm->tm_mday < 0) {
440 tm->tm_mday = num;
441 return n;
442 }
443
444 /* Two-digit year? */
445 if (n == 2 && tm->tm_year < 0) {
446 if (num < 10 && tm->tm_mday >= 0) {
447 tm->tm_year = num + 100;
448 return n;
449 }
450 if (num >= 70) {
451 tm->tm_year = num;
452 return n;
453 }
454 }
455
456 if (num > 0 && num < 32) {
457 tm->tm_mday = num;
458 } else if (num > 1900) {
459 tm->tm_year = num - 1900;
460 } else if (num > 70) {
461 tm->tm_year = num;
462 } else if (num > 0 && num < 13) {
463 tm->tm_mon = num-1;
464 }
ecee9d9e 465
198b0fb6 466 return n;
89967023 467}
ecee9d9e 468
26a2d8ae 469static int match_tz(const char *date, int *offp)
89967023
LT
470{
471 char *end;
472 int offset = strtoul(date+1, &end, 10);
473 int min, hour;
198b0fb6 474 int n = end - date - 1;
ecee9d9e 475
89967023
LT
476 min = offset % 100;
477 hour = offset / 100;
ecee9d9e 478
198b0fb6
LT
479 /*
480 * Don't accept any random crap.. At least 3 digits, and
481 * a valid minute. We might want to check that the minutes
482 * are divisible by 30 or something too.
483 */
68849b54
LT
484 if (min < 60 && n > 2) {
485 offset = hour*60+min;
486 if (*date == '-')
487 offset = -offset;
ecee9d9e 488
68849b54
LT
489 *offp = offset;
490 }
89967023
LT
491 return end - date;
492}
ecee9d9e 493
01c6ad29
LT
494static int date_string(unsigned long date, int offset, char *buf, int len)
495{
496 int sign = '+';
497
498 if (offset < 0) {
499 offset = -offset;
500 sign = '-';
501 }
502 return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
503}
504
89967023
LT
505/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
506 (i.e. English) day/month names, and it doesn't work correctly with %z. */
2a39064c 507int parse_date(const char *date, char *result, int maxlen)
89967023
LT
508{
509 struct tm tm;
01c6ad29 510 int offset, tm_gmt;
89967023 511 time_t then;
ecee9d9e 512
89967023
LT
513 memset(&tm, 0, sizeof(tm));
514 tm.tm_year = -1;
515 tm.tm_mon = -1;
516 tm.tm_mday = -1;
eaa85129
LT
517 tm.tm_isdst = -1;
518 offset = -1;
9cb480f2 519 tm_gmt = 0;
89967023
LT
520
521 for (;;) {
522 int match = 0;
523 unsigned char c = *date;
524
525 /* Stop at end of string or newline */
526 if (!c || c == '\n')
527 break;
528
529 if (isalpha(c))
530 match = match_alpha(date, &tm, &offset);
531 else if (isdigit(c))
9cb480f2 532 match = match_digit(date, &tm, &offset, &tm_gmt);
89967023
LT
533 else if ((c == '-' || c == '+') && isdigit(date[1]))
534 match = match_tz(date, &offset);
535
536 if (!match) {
537 /* BAD CRAP */
538 match = 1;
539 }
540
541 date += match;
542 }
ecee9d9e 543
eaa85129
LT
544 /* mktime uses local timezone */
545 then = my_mktime(&tm);
546 if (offset == -1)
547 offset = (then - mktime(&tm)) / 60;
548
ecee9d9e 549 if (then == -1)
2a39064c 550 return -1;
ecee9d9e 551
9cb480f2
JH
552 if (!tm_gmt)
553 then -= offset * 60;
01c6ad29 554 return date_string(then, offset, result, maxlen);
ecee9d9e
ET
555}
556
557void datestamp(char *buf, int bufsize)
558{
559 time_t now;
560 int offset;
561
562 time(&now);
563
564 offset = my_mktime(localtime(&now)) - now;
565 offset /= 60;
566
01c6ad29 567 date_string(now, offset, buf, bufsize);
ecee9d9e 568}
3c07b1d1
LT
569
570static void update_tm(struct tm *tm, unsigned long sec)
571{
572 time_t n = mktime(tm) - sec;
573 localtime_r(&n, tm);
574}
575
a8aca418
LT
576static void date_yesterday(struct tm *tm, int *num)
577{
578 update_tm(tm, 24*60*60);
579}
580
581static void date_time(struct tm *tm, int hour)
582{
583 if (tm->tm_hour < hour)
584 date_yesterday(tm, NULL);
585 tm->tm_hour = hour;
586 tm->tm_min = 0;
587 tm->tm_sec = 0;
588}
589
590static void date_midnight(struct tm *tm, int *num)
591{
592 date_time(tm, 0);
593}
594
595static void date_noon(struct tm *tm, int *num)
596{
597 date_time(tm, 12);
598}
599
600static void date_tea(struct tm *tm, int *num)
601{
602 date_time(tm, 17);
603}
604
393d340e
LT
605static void date_pm(struct tm *tm, int *num)
606{
18b633ca 607 int hour, n = *num;
393d340e
LT
608 *num = 0;
609
18b633ca
LT
610 hour = tm->tm_hour;
611 if (n) {
612 hour = n;
393d340e
LT
613 tm->tm_min = 0;
614 tm->tm_sec = 0;
615 }
18b633ca 616 tm->tm_hour = (hour % 12) + 12;
393d340e
LT
617}
618
619static void date_am(struct tm *tm, int *num)
620{
18b633ca 621 int hour, n = *num;
393d340e
LT
622 *num = 0;
623
18b633ca
LT
624 hour = tm->tm_hour;
625 if (n) {
626 hour = n;
393d340e
LT
627 tm->tm_min = 0;
628 tm->tm_sec = 0;
629 }
18b633ca 630 tm->tm_hour = (hour % 12);
393d340e
LT
631}
632
a8aca418
LT
633static const struct special {
634 const char *name;
635 void (*fn)(struct tm *, int *);
636} special[] = {
637 { "yesterday", date_yesterday },
638 { "noon", date_noon },
639 { "midnight", date_midnight },
640 { "tea", date_tea },
393d340e
LT
641 { "PM", date_pm },
642 { "AM", date_am },
a8aca418
LT
643 { NULL }
644};
645
3c07b1d1
LT
646static const char *number_name[] = {
647 "zero", "one", "two", "three", "four",
648 "five", "six", "seven", "eight", "nine", "ten",
649};
650
a8aca418 651static const struct typelen {
3c07b1d1
LT
652 const char *type;
653 int length;
654} typelen[] = {
655 { "seconds", 1 },
656 { "minutes", 60 },
657 { "hours", 60*60 },
658 { "days", 24*60*60 },
659 { "weeks", 7*24*60*60 },
660 { NULL }
661};
662
663static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
664{
a8aca418
LT
665 const struct typelen *tl;
666 const struct special *s;
3c07b1d1 667 const char *end = date;
5df7dbba 668 int i;
3c07b1d1 669
5df7dbba
PH
670 while (isalpha(*++end));
671 ;
3c07b1d1
LT
672
673 for (i = 0; i < 12; i++) {
674 int match = match_string(date, month_names[i]);
675 if (match >= 3) {
676 tm->tm_mon = i;
677 return end;
678 }
679 }
680
a8aca418
LT
681 for (s = special; s->name; s++) {
682 int len = strlen(s->name);
683 if (match_string(date, s->name) == len) {
684 s->fn(tm, num);
685 return end;
686 }
3c07b1d1
LT
687 }
688
689 if (!*num) {
690 for (i = 1; i < 11; i++) {
691 int len = strlen(number_name[i]);
692 if (match_string(date, number_name[i]) == len) {
693 *num = i;
694 return end;
695 }
696 }
697 if (match_string(date, "last") == 4)
698 *num = 1;
699 return end;
700 }
701
702 tl = typelen;
703 while (tl->type) {
704 int len = strlen(tl->type);
705 if (match_string(date, tl->type) >= len-1) {
706 update_tm(tm, tl->length * *num);
707 *num = 0;
708 return end;
709 }
710 tl++;
711 }
712
6b7b0427
LT
713 for (i = 0; i < 7; i++) {
714 int match = match_string(date, weekday_names[i]);
715 if (match >= 3) {
716 int diff, n = *num -1;
717 *num = 0;
718
719 diff = tm->tm_wday - i;
720 if (diff <= 0)
721 n++;
722 diff += 7*n;
723
724 update_tm(tm, diff * 24 * 60 * 60);
725 return end;
726 }
727 }
728
3c07b1d1
LT
729 if (match_string(date, "months") >= 5) {
730 int n = tm->tm_mon - *num;
731 *num = 0;
732 while (n < 0) {
733 n += 12;
734 tm->tm_year--;
735 }
736 tm->tm_mon = n;
737 return end;
738 }
739
740 if (match_string(date, "years") >= 4) {
741 tm->tm_year -= *num;
742 *num = 0;
743 return end;
744 }
745
746 return end;
747}
748
e92a54d9
LT
749static const char *approxidate_digit(const char *date, struct tm *tm, int *num)
750{
751 char *end;
752 unsigned long number = strtoul(date, &end, 10);
753
393d340e
LT
754 switch (*end) {
755 case ':':
756 case '.':
757 case '/':
758 case '-':
759 if (isdigit(end[1])) {
760 int match = match_multi_number(number, *end, date, end, tm);
761 if (match)
762 return date + match;
763 }
764 }
765
e92a54d9
LT
766 *num = number;
767 return end;
768}
769
3c07b1d1
LT
770unsigned long approxidate(const char *date)
771{
772 int number = 0;
773 struct tm tm, now;
774 struct timeval tv;
775 char buffer[50];
776
777 if (parse_date(date, buffer, sizeof(buffer)) > 0)
778 return strtoul(buffer, NULL, 10);
779
780 gettimeofday(&tv, NULL);
781 localtime_r(&tv.tv_sec, &tm);
782 now = tm;
783 for (;;) {
784 unsigned char c = *date;
785 if (!c)
786 break;
787 date++;
788 if (isdigit(c)) {
e92a54d9 789 date = approxidate_digit(date-1, &tm, &number);
3c07b1d1
LT
790 continue;
791 }
792 if (isalpha(c))
793 date = approxidate_alpha(date-1, &tm, &number);
794 }
795 if (number > 0 && number < 32)
796 tm.tm_mday = number;
b73cebf4 797 if (tm.tm_mon > now.tm_mon && tm.tm_year == now.tm_year)
3c07b1d1
LT
798 tm.tm_year--;
799 return mktime(&tm);
800}