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1 | /* | |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | */ | |
6 | ||
7 | #include "cache.h" | |
8 | ||
9 | /* | |
10 | * This is like mktime, but without normalization of tm_wday and tm_yday. | |
11 | */ | |
12 | static time_t tm_to_time_t(const struct tm *tm) | |
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--; | |
27 | if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0) | |
28 | return -1; | |
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 | ||
33 | static const char *month_names[] = { | |
34 | "January", "February", "March", "April", "May", "June", | |
35 | "July", "August", "September", "October", "November", "December" | |
36 | }; | |
37 | ||
38 | static const char *weekday_names[] = { | |
39 | "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays" | |
40 | }; | |
41 | ||
42 | static 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 | ||
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 | */ | |
57 | static struct tm *time_to_tm(unsigned long time, int tz) | |
58 | { | |
59 | time_t t = gm_time_t(time, tz); | |
60 | return gmtime(&t); | |
61 | } | |
62 | ||
63 | /* | |
64 | * What value of "tz" was in effect back then at "time" in the | |
65 | * local timezone? | |
66 | */ | |
67 | static 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); | |
75 | t_local = tm_to_time_t(&tm); | |
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 | ||
89 | const 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 */ | |
126 | if (diff < 365) { | |
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 | ||
150 | const char *show_date(unsigned long time, int tz, enum date_mode mode) | |
151 | { | |
152 | struct tm *tm; | |
153 | static char timebuf[200]; | |
154 | ||
155 | if (mode == DATE_RAW) { | |
156 | snprintf(timebuf, sizeof(timebuf), "%lu %+05d", time, tz); | |
157 | return timebuf; | |
158 | } | |
159 | ||
160 | if (mode == DATE_RELATIVE) { | |
161 | struct timeval now; | |
162 | gettimeofday(&now, NULL); | |
163 | return show_date_relative(time, tz, &now, | |
164 | timebuf, sizeof(timebuf)); | |
165 | } | |
166 | ||
167 | if (mode == DATE_LOCAL) | |
168 | tz = local_tzoffset(time); | |
169 | ||
170 | tm = time_to_tm(time, tz); | |
171 | if (!tm) | |
172 | return NULL; | |
173 | if (mode == DATE_SHORT) | |
174 | sprintf(timebuf, "%04d-%02d-%02d", tm->tm_year + 1900, | |
175 | tm->tm_mon + 1, tm->tm_mday); | |
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); | |
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); | |
188 | else | |
189 | sprintf(timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d", | |
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, | |
194 | tm->tm_year + 1900, | |
195 | (mode == DATE_LOCAL) ? 0 : ' ', | |
196 | tz); | |
197 | return timebuf; | |
198 | } | |
199 | ||
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 | */ | |
206 | static const struct { | |
207 | const char *name; | |
208 | int offset; | |
209 | int dst; | |
210 | } timezone_names[] = { | |
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 | { "Z", 0, 0, }, /* Zulu, alias for UTC */ | |
233 | ||
234 | { "WET", 0, 0, }, /* Western European */ | |
235 | { "BST", 0, 1, }, /* British Summer */ | |
236 | { "CET", +1, 0, }, /* Central European */ | |
237 | { "MET", +1, 0, }, /* Middle European */ | |
238 | { "MEWT", +1, 0, }, /* Middle European Winter */ | |
239 | { "MEST", +1, 1, }, /* Middle European Summer */ | |
240 | { "CEST", +1, 1, }, /* Central European Summer */ | |
241 | { "MESZ", +1, 1, }, /* Middle European Summer */ | |
242 | { "FWT", +1, 0, }, /* French Winter */ | |
243 | { "FST", +1, 1, }, /* French Summer */ | |
244 | { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */ | |
245 | { "EEST", +2, 1, }, /* Eastern European Daylight */ | |
246 | { "WAST", +7, 0, }, /* West Australian Standard */ | |
247 | { "WADT", +7, 1, }, /* West Australian Daylight */ | |
248 | { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */ | |
249 | { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */ | |
250 | { "EAST", +10, 0, }, /* Eastern Australian Standard */ | |
251 | { "EADT", +10, 1, }, /* Eastern Australian Daylight */ | |
252 | { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */ | |
253 | { "NZT", +12, 0, }, /* New Zealand */ | |
254 | { "NZST", +12, 0, }, /* New Zealand Standard */ | |
255 | { "NZDT", +12, 1, }, /* New Zealand Daylight */ | |
256 | { "IDLE", +12, 0, }, /* International Date Line East */ | |
257 | }; | |
258 | ||
259 | static int match_string(const char *date, const char *str) | |
260 | { | |
261 | int i = 0; | |
262 | ||
263 | for (i = 0; *date; date++, str++, i++) { | |
264 | if (*date == *str) | |
265 | continue; | |
266 | if (toupper(*date) == toupper(*str)) | |
267 | continue; | |
268 | if (!isalnum(*date)) | |
269 | break; | |
270 | return 0; | |
271 | } | |
272 | return i; | |
273 | } | |
274 | ||
275 | static int skip_alpha(const char *date) | |
276 | { | |
277 | int i = 0; | |
278 | do { | |
279 | i++; | |
280 | } while (isalpha(date[i])); | |
281 | return i; | |
282 | } | |
283 | ||
284 | /* | |
285 | * Parse month, weekday, or timezone name | |
286 | */ | |
287 | static int match_alpha(const char *date, struct tm *tm, int *offset) | |
288 | { | |
289 | int i; | |
290 | ||
291 | for (i = 0; i < 12; i++) { | |
292 | int match = match_string(date, month_names[i]); | |
293 | if (match >= 3) { | |
294 | tm->tm_mon = i; | |
295 | return match; | |
296 | } | |
297 | } | |
298 | ||
299 | for (i = 0; i < 7; i++) { | |
300 | int match = match_string(date, weekday_names[i]); | |
301 | if (match >= 3) { | |
302 | tm->tm_wday = i; | |
303 | return match; | |
304 | } | |
305 | } | |
306 | ||
307 | for (i = 0; i < ARRAY_SIZE(timezone_names); i++) { | |
308 | int match = match_string(date, timezone_names[i].name); | |
309 | if (match >= 3 || match == strlen(timezone_names[i].name)) { | |
310 | int off = timezone_names[i].offset; | |
311 | ||
312 | /* This is bogus, but we like summer */ | |
313 | off += timezone_names[i].dst; | |
314 | ||
315 | /* Only use the tz name offset if we don't have anything better */ | |
316 | if (*offset == -1) | |
317 | *offset = 60*off; | |
318 | ||
319 | return match; | |
320 | } | |
321 | } | |
322 | ||
323 | if (match_string(date, "PM") == 2) { | |
324 | tm->tm_hour = (tm->tm_hour % 12) + 12; | |
325 | return 2; | |
326 | } | |
327 | ||
328 | if (match_string(date, "AM") == 2) { | |
329 | tm->tm_hour = (tm->tm_hour % 12) + 0; | |
330 | return 2; | |
331 | } | |
332 | ||
333 | /* BAD CRAP */ | |
334 | return skip_alpha(date); | |
335 | } | |
336 | ||
337 | static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm) | |
338 | { | |
339 | if (month > 0 && month < 13 && day > 0 && day < 32) { | |
340 | struct tm check = *tm; | |
341 | struct tm *r = (now_tm ? &check : tm); | |
342 | time_t specified; | |
343 | ||
344 | r->tm_mon = month - 1; | |
345 | r->tm_mday = day; | |
346 | if (year == -1) { | |
347 | if (!now_tm) | |
348 | return 1; | |
349 | r->tm_year = now_tm->tm_year; | |
350 | } | |
351 | else if (year >= 1970 && year < 2100) | |
352 | r->tm_year = year - 1900; | |
353 | else if (year > 70 && year < 100) | |
354 | r->tm_year = year; | |
355 | else if (year < 38) | |
356 | r->tm_year = year + 100; | |
357 | else | |
358 | return 0; | |
359 | if (!now_tm) | |
360 | return 1; | |
361 | ||
362 | specified = tm_to_time_t(r); | |
363 | ||
364 | /* Be it commit time or author time, it does not make | |
365 | * sense to specify timestamp way into the future. Make | |
366 | * sure it is not later than ten days from now... | |
367 | */ | |
368 | if (now + 10*24*3600 < specified) | |
369 | return 0; | |
370 | tm->tm_mon = r->tm_mon; | |
371 | tm->tm_mday = r->tm_mday; | |
372 | if (year != -1) | |
373 | tm->tm_year = r->tm_year; | |
374 | return 1; | |
375 | } | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm) | |
380 | { | |
381 | time_t now; | |
382 | struct tm now_tm; | |
383 | struct tm *refuse_future; | |
384 | long num2, num3; | |
385 | ||
386 | num2 = strtol(end+1, &end, 10); | |
387 | num3 = -1; | |
388 | if (*end == c && isdigit(end[1])) | |
389 | num3 = strtol(end+1, &end, 10); | |
390 | ||
391 | /* Time? Date? */ | |
392 | switch (c) { | |
393 | case ':': | |
394 | if (num3 < 0) | |
395 | num3 = 0; | |
396 | if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) { | |
397 | tm->tm_hour = num; | |
398 | tm->tm_min = num2; | |
399 | tm->tm_sec = num3; | |
400 | break; | |
401 | } | |
402 | return 0; | |
403 | ||
404 | case '-': | |
405 | case '/': | |
406 | case '.': | |
407 | now = time(NULL); | |
408 | refuse_future = NULL; | |
409 | if (gmtime_r(&now, &now_tm)) | |
410 | refuse_future = &now_tm; | |
411 | ||
412 | if (num > 70) { | |
413 | /* yyyy-mm-dd? */ | |
414 | if (is_date(num, num2, num3, refuse_future, now, tm)) | |
415 | break; | |
416 | /* yyyy-dd-mm? */ | |
417 | if (is_date(num, num3, num2, refuse_future, now, tm)) | |
418 | break; | |
419 | } | |
420 | /* Our eastern European friends say dd.mm.yy[yy] | |
421 | * is the norm there, so giving precedence to | |
422 | * mm/dd/yy[yy] form only when separator is not '.' | |
423 | */ | |
424 | if (c != '.' && | |
425 | is_date(num3, num, num2, refuse_future, now, tm)) | |
426 | break; | |
427 | /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */ | |
428 | if (is_date(num3, num2, num, refuse_future, now, tm)) | |
429 | break; | |
430 | /* Funny European mm.dd.yy */ | |
431 | if (c == '.' && | |
432 | is_date(num3, num, num2, refuse_future, now, tm)) | |
433 | break; | |
434 | return 0; | |
435 | } | |
436 | return end - date; | |
437 | } | |
438 | ||
439 | /* | |
440 | * Have we filled in any part of the time/date yet? | |
441 | * We just do a binary 'and' to see if the sign bit | |
442 | * is set in all the values. | |
443 | */ | |
444 | static inline int nodate(struct tm *tm) | |
445 | { | |
446 | return (tm->tm_year & | |
447 | tm->tm_mon & | |
448 | tm->tm_mday & | |
449 | tm->tm_hour & | |
450 | tm->tm_min & | |
451 | tm->tm_sec) < 0; | |
452 | } | |
453 | ||
454 | /* | |
455 | * We've seen a digit. Time? Year? Date? | |
456 | */ | |
457 | static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt) | |
458 | { | |
459 | int n; | |
460 | char *end; | |
461 | unsigned long num; | |
462 | ||
463 | num = strtoul(date, &end, 10); | |
464 | ||
465 | /* | |
466 | * Seconds since 1970? We trigger on that for any numbers with | |
467 | * more than 8 digits. This is because we don't want to rule out | |
468 | * numbers like 20070606 as a YYYYMMDD date. | |
469 | */ | |
470 | if (num >= 100000000 && nodate(tm)) { | |
471 | time_t time = num; | |
472 | if (gmtime_r(&time, tm)) { | |
473 | *tm_gmt = 1; | |
474 | return end - date; | |
475 | } | |
476 | } | |
477 | ||
478 | /* | |
479 | * Check for special formats: num[-.:/]num[same]num | |
480 | */ | |
481 | switch (*end) { | |
482 | case ':': | |
483 | case '.': | |
484 | case '/': | |
485 | case '-': | |
486 | if (isdigit(end[1])) { | |
487 | int match = match_multi_number(num, *end, date, end, tm); | |
488 | if (match) | |
489 | return match; | |
490 | } | |
491 | } | |
492 | ||
493 | /* | |
494 | * None of the special formats? Try to guess what | |
495 | * the number meant. We use the number of digits | |
496 | * to make a more educated guess.. | |
497 | */ | |
498 | n = 0; | |
499 | do { | |
500 | n++; | |
501 | } while (isdigit(date[n])); | |
502 | ||
503 | /* Four-digit year or a timezone? */ | |
504 | if (n == 4) { | |
505 | if (num <= 1400 && *offset == -1) { | |
506 | unsigned int minutes = num % 100; | |
507 | unsigned int hours = num / 100; | |
508 | *offset = hours*60 + minutes; | |
509 | } else if (num > 1900 && num < 2100) | |
510 | tm->tm_year = num - 1900; | |
511 | return n; | |
512 | } | |
513 | ||
514 | /* | |
515 | * Ignore lots of numerals. We took care of 4-digit years above. | |
516 | * Days or months must be one or two digits. | |
517 | */ | |
518 | if (n > 2) | |
519 | return n; | |
520 | ||
521 | /* | |
522 | * NOTE! We will give precedence to day-of-month over month or | |
523 | * year numbers in the 1-12 range. So 05 is always "mday 5", | |
524 | * unless we already have a mday.. | |
525 | * | |
526 | * IOW, 01 Apr 05 parses as "April 1st, 2005". | |
527 | */ | |
528 | if (num > 0 && num < 32 && tm->tm_mday < 0) { | |
529 | tm->tm_mday = num; | |
530 | return n; | |
531 | } | |
532 | ||
533 | /* Two-digit year? */ | |
534 | if (n == 2 && tm->tm_year < 0) { | |
535 | if (num < 10 && tm->tm_mday >= 0) { | |
536 | tm->tm_year = num + 100; | |
537 | return n; | |
538 | } | |
539 | if (num >= 70) { | |
540 | tm->tm_year = num; | |
541 | return n; | |
542 | } | |
543 | } | |
544 | ||
545 | if (num > 0 && num < 13 && tm->tm_mon < 0) | |
546 | tm->tm_mon = num-1; | |
547 | ||
548 | return n; | |
549 | } | |
550 | ||
551 | static int match_tz(const char *date, int *offp) | |
552 | { | |
553 | char *end; | |
554 | int offset = strtoul(date+1, &end, 10); | |
555 | int min, hour; | |
556 | int n = end - date - 1; | |
557 | ||
558 | min = offset % 100; | |
559 | hour = offset / 100; | |
560 | ||
561 | /* | |
562 | * Don't accept any random crap.. At least 3 digits, and | |
563 | * a valid minute. We might want to check that the minutes | |
564 | * are divisible by 30 or something too. | |
565 | */ | |
566 | if (min < 60 && n > 2) { | |
567 | offset = hour*60+min; | |
568 | if (*date == '-') | |
569 | offset = -offset; | |
570 | ||
571 | *offp = offset; | |
572 | } | |
573 | return end - date; | |
574 | } | |
575 | ||
576 | static int date_string(unsigned long date, int offset, char *buf, int len) | |
577 | { | |
578 | int sign = '+'; | |
579 | ||
580 | if (offset < 0) { | |
581 | offset = -offset; | |
582 | sign = '-'; | |
583 | } | |
584 | return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60); | |
585 | } | |
586 | ||
587 | /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822 | |
588 | (i.e. English) day/month names, and it doesn't work correctly with %z. */ | |
589 | int parse_date_basic(const char *date, unsigned long *timestamp, int *offset) | |
590 | { | |
591 | struct tm tm; | |
592 | int tm_gmt; | |
593 | unsigned long dummy_timestamp; | |
594 | int dummy_offset; | |
595 | ||
596 | if (!timestamp) | |
597 | timestamp = &dummy_timestamp; | |
598 | if (!offset) | |
599 | offset = &dummy_offset; | |
600 | ||
601 | memset(&tm, 0, sizeof(tm)); | |
602 | tm.tm_year = -1; | |
603 | tm.tm_mon = -1; | |
604 | tm.tm_mday = -1; | |
605 | tm.tm_isdst = -1; | |
606 | tm.tm_hour = -1; | |
607 | tm.tm_min = -1; | |
608 | tm.tm_sec = -1; | |
609 | *offset = -1; | |
610 | tm_gmt = 0; | |
611 | ||
612 | for (;;) { | |
613 | int match = 0; | |
614 | unsigned char c = *date; | |
615 | ||
616 | /* Stop at end of string or newline */ | |
617 | if (!c || c == '\n') | |
618 | break; | |
619 | ||
620 | if (isalpha(c)) | |
621 | match = match_alpha(date, &tm, offset); | |
622 | else if (isdigit(c)) | |
623 | match = match_digit(date, &tm, offset, &tm_gmt); | |
624 | else if ((c == '-' || c == '+') && isdigit(date[1])) | |
625 | match = match_tz(date, offset); | |
626 | ||
627 | if (!match) { | |
628 | /* BAD CRAP */ | |
629 | match = 1; | |
630 | } | |
631 | ||
632 | date += match; | |
633 | } | |
634 | ||
635 | /* mktime uses local timezone */ | |
636 | *timestamp = tm_to_time_t(&tm); | |
637 | if (*offset == -1) | |
638 | *offset = ((time_t)*timestamp - mktime(&tm)) / 60; | |
639 | ||
640 | if (*timestamp == -1) | |
641 | return -1; | |
642 | ||
643 | if (!tm_gmt) | |
644 | *timestamp -= *offset * 60; | |
645 | return 0; /* success */ | |
646 | } | |
647 | ||
648 | int parse_date(const char *date, char *result, int maxlen) | |
649 | { | |
650 | unsigned long timestamp; | |
651 | int offset; | |
652 | if (parse_date_basic(date, ×tamp, &offset)) | |
653 | return -1; | |
654 | return date_string(timestamp, offset, result, maxlen); | |
655 | } | |
656 | ||
657 | enum date_mode parse_date_format(const char *format) | |
658 | { | |
659 | if (!strcmp(format, "relative")) | |
660 | return DATE_RELATIVE; | |
661 | else if (!strcmp(format, "iso8601") || | |
662 | !strcmp(format, "iso")) | |
663 | return DATE_ISO8601; | |
664 | else if (!strcmp(format, "rfc2822") || | |
665 | !strcmp(format, "rfc")) | |
666 | return DATE_RFC2822; | |
667 | else if (!strcmp(format, "short")) | |
668 | return DATE_SHORT; | |
669 | else if (!strcmp(format, "local")) | |
670 | return DATE_LOCAL; | |
671 | else if (!strcmp(format, "default")) | |
672 | return DATE_NORMAL; | |
673 | else if (!strcmp(format, "raw")) | |
674 | return DATE_RAW; | |
675 | else | |
676 | die("unknown date format %s", format); | |
677 | } | |
678 | ||
679 | void datestamp(char *buf, int bufsize) | |
680 | { | |
681 | time_t now; | |
682 | int offset; | |
683 | ||
684 | time(&now); | |
685 | ||
686 | offset = tm_to_time_t(localtime(&now)) - now; | |
687 | offset /= 60; | |
688 | ||
689 | date_string(now, offset, buf, bufsize); | |
690 | } | |
691 | ||
692 | /* | |
693 | * Relative time update (eg "2 days ago"). If we haven't set the time | |
694 | * yet, we need to set it from current time. | |
695 | */ | |
696 | static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec) | |
697 | { | |
698 | time_t n; | |
699 | ||
700 | if (tm->tm_mday < 0) | |
701 | tm->tm_mday = now->tm_mday; | |
702 | if (tm->tm_mon < 0) | |
703 | tm->tm_mon = now->tm_mon; | |
704 | if (tm->tm_year < 0) { | |
705 | tm->tm_year = now->tm_year; | |
706 | if (tm->tm_mon > now->tm_mon) | |
707 | tm->tm_year--; | |
708 | } | |
709 | ||
710 | n = mktime(tm) - sec; | |
711 | localtime_r(&n, tm); | |
712 | return n; | |
713 | } | |
714 | ||
715 | static void date_now(struct tm *tm, struct tm *now, int *num) | |
716 | { | |
717 | update_tm(tm, now, 0); | |
718 | } | |
719 | ||
720 | static void date_yesterday(struct tm *tm, struct tm *now, int *num) | |
721 | { | |
722 | update_tm(tm, now, 24*60*60); | |
723 | } | |
724 | ||
725 | static void date_time(struct tm *tm, struct tm *now, int hour) | |
726 | { | |
727 | if (tm->tm_hour < hour) | |
728 | date_yesterday(tm, now, NULL); | |
729 | tm->tm_hour = hour; | |
730 | tm->tm_min = 0; | |
731 | tm->tm_sec = 0; | |
732 | } | |
733 | ||
734 | static void date_midnight(struct tm *tm, struct tm *now, int *num) | |
735 | { | |
736 | date_time(tm, now, 0); | |
737 | } | |
738 | ||
739 | static void date_noon(struct tm *tm, struct tm *now, int *num) | |
740 | { | |
741 | date_time(tm, now, 12); | |
742 | } | |
743 | ||
744 | static void date_tea(struct tm *tm, struct tm *now, int *num) | |
745 | { | |
746 | date_time(tm, now, 17); | |
747 | } | |
748 | ||
749 | static void date_pm(struct tm *tm, struct tm *now, int *num) | |
750 | { | |
751 | int hour, n = *num; | |
752 | *num = 0; | |
753 | ||
754 | hour = tm->tm_hour; | |
755 | if (n) { | |
756 | hour = n; | |
757 | tm->tm_min = 0; | |
758 | tm->tm_sec = 0; | |
759 | } | |
760 | tm->tm_hour = (hour % 12) + 12; | |
761 | } | |
762 | ||
763 | static void date_am(struct tm *tm, struct tm *now, int *num) | |
764 | { | |
765 | int hour, n = *num; | |
766 | *num = 0; | |
767 | ||
768 | hour = tm->tm_hour; | |
769 | if (n) { | |
770 | hour = n; | |
771 | tm->tm_min = 0; | |
772 | tm->tm_sec = 0; | |
773 | } | |
774 | tm->tm_hour = (hour % 12); | |
775 | } | |
776 | ||
777 | static void date_never(struct tm *tm, struct tm *now, int *num) | |
778 | { | |
779 | time_t n = 0; | |
780 | localtime_r(&n, tm); | |
781 | } | |
782 | ||
783 | static const struct special { | |
784 | const char *name; | |
785 | void (*fn)(struct tm *, struct tm *, int *); | |
786 | } special[] = { | |
787 | { "yesterday", date_yesterday }, | |
788 | { "noon", date_noon }, | |
789 | { "midnight", date_midnight }, | |
790 | { "tea", date_tea }, | |
791 | { "PM", date_pm }, | |
792 | { "AM", date_am }, | |
793 | { "never", date_never }, | |
794 | { "now", date_now }, | |
795 | { NULL } | |
796 | }; | |
797 | ||
798 | static const char *number_name[] = { | |
799 | "zero", "one", "two", "three", "four", | |
800 | "five", "six", "seven", "eight", "nine", "ten", | |
801 | }; | |
802 | ||
803 | static const struct typelen { | |
804 | const char *type; | |
805 | int length; | |
806 | } typelen[] = { | |
807 | { "seconds", 1 }, | |
808 | { "minutes", 60 }, | |
809 | { "hours", 60*60 }, | |
810 | { "days", 24*60*60 }, | |
811 | { "weeks", 7*24*60*60 }, | |
812 | { NULL } | |
813 | }; | |
814 | ||
815 | static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched) | |
816 | { | |
817 | const struct typelen *tl; | |
818 | const struct special *s; | |
819 | const char *end = date; | |
820 | int i; | |
821 | ||
822 | while (isalpha(*++end)); | |
823 | ; | |
824 | ||
825 | for (i = 0; i < 12; i++) { | |
826 | int match = match_string(date, month_names[i]); | |
827 | if (match >= 3) { | |
828 | tm->tm_mon = i; | |
829 | *touched = 1; | |
830 | return end; | |
831 | } | |
832 | } | |
833 | ||
834 | for (s = special; s->name; s++) { | |
835 | int len = strlen(s->name); | |
836 | if (match_string(date, s->name) == len) { | |
837 | s->fn(tm, now, num); | |
838 | *touched = 1; | |
839 | return end; | |
840 | } | |
841 | } | |
842 | ||
843 | if (!*num) { | |
844 | for (i = 1; i < 11; i++) { | |
845 | int len = strlen(number_name[i]); | |
846 | if (match_string(date, number_name[i]) == len) { | |
847 | *num = i; | |
848 | *touched = 1; | |
849 | return end; | |
850 | } | |
851 | } | |
852 | if (match_string(date, "last") == 4) { | |
853 | *num = 1; | |
854 | *touched = 1; | |
855 | } | |
856 | return end; | |
857 | } | |
858 | ||
859 | tl = typelen; | |
860 | while (tl->type) { | |
861 | int len = strlen(tl->type); | |
862 | if (match_string(date, tl->type) >= len-1) { | |
863 | update_tm(tm, now, tl->length * *num); | |
864 | *num = 0; | |
865 | *touched = 1; | |
866 | return end; | |
867 | } | |
868 | tl++; | |
869 | } | |
870 | ||
871 | for (i = 0; i < 7; i++) { | |
872 | int match = match_string(date, weekday_names[i]); | |
873 | if (match >= 3) { | |
874 | int diff, n = *num -1; | |
875 | *num = 0; | |
876 | ||
877 | diff = tm->tm_wday - i; | |
878 | if (diff <= 0) | |
879 | n++; | |
880 | diff += 7*n; | |
881 | ||
882 | update_tm(tm, now, diff * 24 * 60 * 60); | |
883 | *touched = 1; | |
884 | return end; | |
885 | } | |
886 | } | |
887 | ||
888 | if (match_string(date, "months") >= 5) { | |
889 | int n; | |
890 | update_tm(tm, now, 0); /* fill in date fields if needed */ | |
891 | n = tm->tm_mon - *num; | |
892 | *num = 0; | |
893 | while (n < 0) { | |
894 | n += 12; | |
895 | tm->tm_year--; | |
896 | } | |
897 | tm->tm_mon = n; | |
898 | *touched = 1; | |
899 | return end; | |
900 | } | |
901 | ||
902 | if (match_string(date, "years") >= 4) { | |
903 | update_tm(tm, now, 0); /* fill in date fields if needed */ | |
904 | tm->tm_year -= *num; | |
905 | *num = 0; | |
906 | *touched = 1; | |
907 | return end; | |
908 | } | |
909 | ||
910 | return end; | |
911 | } | |
912 | ||
913 | static const char *approxidate_digit(const char *date, struct tm *tm, int *num) | |
914 | { | |
915 | char *end; | |
916 | unsigned long number = strtoul(date, &end, 10); | |
917 | ||
918 | switch (*end) { | |
919 | case ':': | |
920 | case '.': | |
921 | case '/': | |
922 | case '-': | |
923 | if (isdigit(end[1])) { | |
924 | int match = match_multi_number(number, *end, date, end, tm); | |
925 | if (match) | |
926 | return date + match; | |
927 | } | |
928 | } | |
929 | ||
930 | /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */ | |
931 | if (date[0] != '0' || end - date <= 2) | |
932 | *num = number; | |
933 | return end; | |
934 | } | |
935 | ||
936 | /* | |
937 | * Do we have a pending number at the end, or when | |
938 | * we see a new one? Let's assume it's a month day, | |
939 | * as in "Dec 6, 1992" | |
940 | */ | |
941 | static void pending_number(struct tm *tm, int *num) | |
942 | { | |
943 | int number = *num; | |
944 | ||
945 | if (number) { | |
946 | *num = 0; | |
947 | if (tm->tm_mday < 0 && number < 32) | |
948 | tm->tm_mday = number; | |
949 | else if (tm->tm_mon < 0 && number < 13) | |
950 | tm->tm_mon = number-1; | |
951 | else if (tm->tm_year < 0) { | |
952 | if (number > 1969 && number < 2100) | |
953 | tm->tm_year = number - 1900; | |
954 | else if (number > 69 && number < 100) | |
955 | tm->tm_year = number; | |
956 | else if (number < 38) | |
957 | tm->tm_year = 100 + number; | |
958 | /* We screw up for number = 00 ? */ | |
959 | } | |
960 | } | |
961 | } | |
962 | ||
963 | static unsigned long approxidate_str(const char *date, | |
964 | const struct timeval *tv, | |
965 | int *error_ret) | |
966 | { | |
967 | int number = 0; | |
968 | int touched = 0; | |
969 | struct tm tm, now; | |
970 | time_t time_sec; | |
971 | ||
972 | time_sec = tv->tv_sec; | |
973 | localtime_r(&time_sec, &tm); | |
974 | now = tm; | |
975 | ||
976 | tm.tm_year = -1; | |
977 | tm.tm_mon = -1; | |
978 | tm.tm_mday = -1; | |
979 | ||
980 | for (;;) { | |
981 | unsigned char c = *date; | |
982 | if (!c) | |
983 | break; | |
984 | date++; | |
985 | if (isdigit(c)) { | |
986 | pending_number(&tm, &number); | |
987 | date = approxidate_digit(date-1, &tm, &number); | |
988 | touched = 1; | |
989 | continue; | |
990 | } | |
991 | if (isalpha(c)) | |
992 | date = approxidate_alpha(date-1, &tm, &now, &number, &touched); | |
993 | } | |
994 | pending_number(&tm, &number); | |
995 | if (!touched) | |
996 | *error_ret = 1; | |
997 | return update_tm(&tm, &now, 0); | |
998 | } | |
999 | ||
1000 | unsigned long approxidate_relative(const char *date, const struct timeval *tv) | |
1001 | { | |
1002 | unsigned long timestamp; | |
1003 | int offset; | |
1004 | int errors = 0; | |
1005 | ||
1006 | if (!parse_date_basic(date, ×tamp, &offset)) | |
1007 | return timestamp; | |
1008 | return approxidate_str(date, tv, &errors); | |
1009 | } | |
1010 | ||
1011 | unsigned long approxidate_careful(const char *date, int *error_ret) | |
1012 | { | |
1013 | struct timeval tv; | |
1014 | unsigned long timestamp; | |
1015 | int offset; | |
1016 | int dummy = 0; | |
1017 | if (!error_ret) | |
1018 | error_ret = &dummy; | |
1019 | ||
1020 | if (!parse_date_basic(date, ×tamp, &offset)) { | |
1021 | *error_ret = 0; | |
1022 | return timestamp; | |
1023 | } | |
1024 | ||
1025 | gettimeofday(&tv, NULL); | |
1026 | return approxidate_str(date, &tv, error_ret); | |
1027 | } |