2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
10 * This is like mktime, but without normalization of tm_wday and tm_yday.
12 static time_t tm_to_time_t(const struct tm
*tm
)
14 static const int mdays
[] = {
15 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
17 int year
= tm
->tm_year
- 70;
18 int month
= tm
->tm_mon
;
19 int day
= tm
->tm_mday
;
21 if (year
< 0 || year
> 129) /* algo only works for 1970-2099 */
23 if (month
< 0 || month
> 11) /* array bounds */
25 if (month
< 2 || (year
+ 2) % 4)
27 if (tm
->tm_hour
< 0 || tm
->tm_min
< 0 || tm
->tm_sec
< 0)
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
;
33 static const char *month_names
[] = {
34 "January", "February", "March", "April", "May", "June",
35 "July", "August", "September", "October", "November", "December"
38 static const char *weekday_names
[] = {
39 "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
42 static time_t gm_time_t(timestamp_t time
, int tz
)
46 minutes
= tz
< 0 ? -tz
: tz
;
47 minutes
= (minutes
/ 100)*60 + (minutes
% 100);
48 minutes
= tz
< 0 ? -minutes
: minutes
;
51 if (unsigned_add_overflows(time
, minutes
* 60))
52 die("Timestamp+tz too large: %"PRItime
" +%04d",
54 } else if (time
< -minutes
* 60)
55 die("Timestamp before Unix epoch: %"PRItime
" %04d", time
, tz
);
57 if (date_overflows(time
))
58 die("Timestamp too large for this system: %"PRItime
, time
);
63 * The "tz" thing is passed in as this strange "decimal parse of tz"
64 * thing, which means that tz -0100 is passed in as the integer -100,
65 * even though it means "sixty minutes off"
67 static struct tm
*time_to_tm(timestamp_t time
, int tz
)
69 time_t t
= gm_time_t(time
, tz
);
73 static struct tm
*time_to_tm_local(timestamp_t time
)
80 * Fill in the localtime 'struct tm' for the supplied time,
81 * and return the local tz.
83 static int local_time_tzoffset(time_t t
, struct tm
*tm
)
89 t_local
= tm_to_time_t(tm
);
91 return 0; /* error; just use +0000 */
99 offset
/= 60; /* in minutes */
100 offset
= (offset
% 60) + ((offset
/ 60) * 100);
101 return offset
* eastwest
;
105 * What value of "tz" was in effect back then at "time" in the
108 static int local_tzoffset(timestamp_t time
)
112 if (date_overflows(time
))
113 die("Timestamp too large for this system: %"PRItime
, time
);
115 return local_time_tzoffset((time_t)time
, &tm
);
118 static void get_time(struct timeval
*now
)
122 x
= getenv("GIT_TEST_DATE_NOW");
124 now
->tv_sec
= atoi(x
);
128 gettimeofday(now
, NULL
);
131 void show_date_relative(timestamp_t time
,
132 const struct timeval
*now
,
133 struct strbuf
*timebuf
)
136 if (now
->tv_sec
< time
) {
137 strbuf_addstr(timebuf
, _("in the future"));
140 diff
= now
->tv_sec
- time
;
143 Q_("%"PRItime
" second ago", "%"PRItime
" seconds ago", diff
), diff
);
146 /* Turn it into minutes */
147 diff
= (diff
+ 30) / 60;
150 Q_("%"PRItime
" minute ago", "%"PRItime
" minutes ago", diff
), diff
);
153 /* Turn it into hours */
154 diff
= (diff
+ 30) / 60;
157 Q_("%"PRItime
" hour ago", "%"PRItime
" hours ago", diff
), diff
);
160 /* We deal with number of days from here on */
161 diff
= (diff
+ 12) / 24;
164 Q_("%"PRItime
" day ago", "%"PRItime
" days ago", diff
), diff
);
167 /* Say weeks for the past 10 weeks or so */
170 Q_("%"PRItime
" week ago", "%"PRItime
" weeks ago", (diff
+ 3) / 7),
174 /* Say months for the past 12 months or so */
177 Q_("%"PRItime
" month ago", "%"PRItime
" months ago", (diff
+ 15) / 30),
181 /* Give years and months for 5 years or so */
183 timestamp_t totalmonths
= (diff
* 12 * 2 + 365) / (365 * 2);
184 timestamp_t years
= totalmonths
/ 12;
185 timestamp_t months
= totalmonths
% 12;
187 struct strbuf sb
= STRBUF_INIT
;
188 strbuf_addf(&sb
, Q_("%"PRItime
" year", "%"PRItime
" years", years
), years
);
190 /* TRANSLATORS: "%s" is "<n> years" */
191 Q_("%s, %"PRItime
" month ago", "%s, %"PRItime
" months ago", months
),
196 Q_("%"PRItime
" year ago", "%"PRItime
" years ago", years
), years
);
199 /* Otherwise, just years. Centuries is probably overkill. */
201 Q_("%"PRItime
" year ago", "%"PRItime
" years ago", (diff
+ 183) / 365),
205 struct date_mode
*date_mode_from_type(enum date_mode_type type
)
207 static struct date_mode mode
;
208 if (type
== DATE_STRFTIME
)
209 BUG("cannot create anonymous strftime date_mode struct");
215 static void show_date_normal(struct strbuf
*buf
, timestamp_t time
, struct tm
*tm
, int tz
, struct tm
*human_tm
, int human_tz
, int local
)
226 hide
.tz
= local
|| tz
== human_tz
;
227 hide
.year
= tm
->tm_year
== human_tm
->tm_year
;
229 if (tm
->tm_mon
== human_tm
->tm_mon
) {
230 if (tm
->tm_mday
> human_tm
->tm_mday
) {
231 /* Future date: think timezones */
232 } else if (tm
->tm_mday
== human_tm
->tm_mday
) {
233 hide
.date
= hide
.wday
= 1;
234 } else if (tm
->tm_mday
+ 5 > human_tm
->tm_mday
) {
235 /* Leave just weekday if it was a few days ago */
241 /* Show "today" times as just relative times */
245 show_date_relative(time
, &now
, buf
);
250 * Always hide seconds for human-readable.
251 * Hide timezone if showing date.
252 * Hide weekday and time if showing year.
254 * The logic here is two-fold:
255 * (a) only show details when recent enough to matter
256 * (b) keep the maximum length "similar", and in check
258 if (human_tm
->tm_year
) {
260 hide
.tz
|= !hide
.date
;
261 hide
.wday
= hide
.time
= !hide
.year
;
265 strbuf_addf(buf
, "%.3s ", weekday_names
[tm
->tm_wday
]);
267 strbuf_addf(buf
, "%.3s %d ", month_names
[tm
->tm_mon
], tm
->tm_mday
);
269 /* Do we want AM/PM depending on locale? */
271 strbuf_addf(buf
, "%02d:%02d", tm
->tm_hour
, tm
->tm_min
);
273 strbuf_addf(buf
, ":%02d", tm
->tm_sec
);
278 strbuf_addf(buf
, " %d", tm
->tm_year
+ 1900);
281 strbuf_addf(buf
, " %+05d", tz
);
284 const char *show_date(timestamp_t time
, int tz
, const struct date_mode
*mode
)
287 struct tm human_tm
= { 0 };
289 static struct strbuf timebuf
= STRBUF_INIT
;
291 if (mode
->type
== DATE_UNIX
) {
292 strbuf_reset(&timebuf
);
293 strbuf_addf(&timebuf
, "%"PRItime
, time
);
297 if (mode
->type
== DATE_HUMAN
) {
302 /* Fill in the data for "current time" in human_tz and human_tm */
303 human_tz
= local_time_tzoffset(now
.tv_sec
, &human_tm
);
307 tz
= local_tzoffset(time
);
309 if (mode
->type
== DATE_RAW
) {
310 strbuf_reset(&timebuf
);
311 strbuf_addf(&timebuf
, "%"PRItime
" %+05d", time
, tz
);
315 if (mode
->type
== DATE_RELATIVE
) {
318 strbuf_reset(&timebuf
);
320 show_date_relative(time
, &now
, &timebuf
);
325 tm
= time_to_tm_local(time
);
327 tm
= time_to_tm(time
, tz
);
329 tm
= time_to_tm(0, 0);
333 strbuf_reset(&timebuf
);
334 if (mode
->type
== DATE_SHORT
)
335 strbuf_addf(&timebuf
, "%04d-%02d-%02d", tm
->tm_year
+ 1900,
336 tm
->tm_mon
+ 1, tm
->tm_mday
);
337 else if (mode
->type
== DATE_ISO8601
)
338 strbuf_addf(&timebuf
, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
342 tm
->tm_hour
, tm
->tm_min
, tm
->tm_sec
,
344 else if (mode
->type
== DATE_ISO8601_STRICT
) {
345 char sign
= (tz
>= 0) ? '+' : '-';
347 strbuf_addf(&timebuf
, "%04d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d",
351 tm
->tm_hour
, tm
->tm_min
, tm
->tm_sec
,
352 sign
, tz
/ 100, tz
% 100);
353 } else if (mode
->type
== DATE_RFC2822
)
354 strbuf_addf(&timebuf
, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
355 weekday_names
[tm
->tm_wday
], tm
->tm_mday
,
356 month_names
[tm
->tm_mon
], tm
->tm_year
+ 1900,
357 tm
->tm_hour
, tm
->tm_min
, tm
->tm_sec
, tz
);
358 else if (mode
->type
== DATE_STRFTIME
)
359 strbuf_addftime(&timebuf
, mode
->strftime_fmt
, tm
, tz
,
362 show_date_normal(&timebuf
, time
, tm
, tz
, &human_tm
, human_tz
, mode
->local
);
367 * Check these. And note how it doesn't do the summer-time conversion.
369 * In my world, it's always summer, and things are probably a bit off
372 static const struct {
376 } timezone_names
[] = {
377 { "IDLW", -12, 0, }, /* International Date Line West */
378 { "NT", -11, 0, }, /* Nome */
379 { "CAT", -10, 0, }, /* Central Alaska */
380 { "HST", -10, 0, }, /* Hawaii Standard */
381 { "HDT", -10, 1, }, /* Hawaii Daylight */
382 { "YST", -9, 0, }, /* Yukon Standard */
383 { "YDT", -9, 1, }, /* Yukon Daylight */
384 { "PST", -8, 0, }, /* Pacific Standard */
385 { "PDT", -8, 1, }, /* Pacific Daylight */
386 { "MST", -7, 0, }, /* Mountain Standard */
387 { "MDT", -7, 1, }, /* Mountain Daylight */
388 { "CST", -6, 0, }, /* Central Standard */
389 { "CDT", -6, 1, }, /* Central Daylight */
390 { "EST", -5, 0, }, /* Eastern Standard */
391 { "EDT", -5, 1, }, /* Eastern Daylight */
392 { "AST", -3, 0, }, /* Atlantic Standard */
393 { "ADT", -3, 1, }, /* Atlantic Daylight */
394 { "WAT", -1, 0, }, /* West Africa */
396 { "GMT", 0, 0, }, /* Greenwich Mean */
397 { "UTC", 0, 0, }, /* Universal (Coordinated) */
398 { "Z", 0, 0, }, /* Zulu, alias for UTC */
400 { "WET", 0, 0, }, /* Western European */
401 { "BST", 0, 1, }, /* British Summer */
402 { "CET", +1, 0, }, /* Central European */
403 { "MET", +1, 0, }, /* Middle European */
404 { "MEWT", +1, 0, }, /* Middle European Winter */
405 { "MEST", +1, 1, }, /* Middle European Summer */
406 { "CEST", +1, 1, }, /* Central European Summer */
407 { "MESZ", +1, 1, }, /* Middle European Summer */
408 { "FWT", +1, 0, }, /* French Winter */
409 { "FST", +1, 1, }, /* French Summer */
410 { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
411 { "EEST", +2, 1, }, /* Eastern European Daylight */
412 { "WAST", +7, 0, }, /* West Australian Standard */
413 { "WADT", +7, 1, }, /* West Australian Daylight */
414 { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
415 { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
416 { "EAST", +10, 0, }, /* Eastern Australian Standard */
417 { "EADT", +10, 1, }, /* Eastern Australian Daylight */
418 { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
419 { "NZT", +12, 0, }, /* New Zealand */
420 { "NZST", +12, 0, }, /* New Zealand Standard */
421 { "NZDT", +12, 1, }, /* New Zealand Daylight */
422 { "IDLE", +12, 0, }, /* International Date Line East */
425 static int match_string(const char *date
, const char *str
)
429 for (i
= 0; *date
; date
++, str
++, i
++) {
432 if (toupper(*date
) == toupper(*str
))
441 static int skip_alpha(const char *date
)
446 } while (isalpha(date
[i
]));
451 * Parse month, weekday, or timezone name
453 static int match_alpha(const char *date
, struct tm
*tm
, int *offset
)
457 for (i
= 0; i
< 12; i
++) {
458 int match
= match_string(date
, month_names
[i
]);
465 for (i
= 0; i
< 7; i
++) {
466 int match
= match_string(date
, weekday_names
[i
]);
473 for (i
= 0; i
< ARRAY_SIZE(timezone_names
); i
++) {
474 int match
= match_string(date
, timezone_names
[i
].name
);
475 if (match
>= 3 || match
== strlen(timezone_names
[i
].name
)) {
476 int off
= timezone_names
[i
].offset
;
478 /* This is bogus, but we like summer */
479 off
+= timezone_names
[i
].dst
;
481 /* Only use the tz name offset if we don't have anything better */
489 if (match_string(date
, "PM") == 2) {
490 tm
->tm_hour
= (tm
->tm_hour
% 12) + 12;
494 if (match_string(date
, "AM") == 2) {
495 tm
->tm_hour
= (tm
->tm_hour
% 12) + 0;
500 return skip_alpha(date
);
503 static int is_date(int year
, int month
, int day
, struct tm
*now_tm
, time_t now
, struct tm
*tm
)
505 if (month
> 0 && month
< 13 && day
> 0 && day
< 32) {
506 struct tm check
= *tm
;
507 struct tm
*r
= (now_tm
? &check
: tm
);
510 r
->tm_mon
= month
- 1;
515 r
->tm_year
= now_tm
->tm_year
;
517 else if (year
>= 1970 && year
< 2100)
518 r
->tm_year
= year
- 1900;
519 else if (year
> 70 && year
< 100)
522 r
->tm_year
= year
+ 100;
528 specified
= tm_to_time_t(r
);
530 /* Be it commit time or author time, it does not make
531 * sense to specify timestamp way into the future. Make
532 * sure it is not later than ten days from now...
534 if ((specified
!= -1) && (now
+ 10*24*3600 < specified
))
536 tm
->tm_mon
= r
->tm_mon
;
537 tm
->tm_mday
= r
->tm_mday
;
539 tm
->tm_year
= r
->tm_year
;
545 static int match_multi_number(timestamp_t num
, char c
, const char *date
,
546 char *end
, struct tm
*tm
, time_t now
)
549 struct tm
*refuse_future
;
552 num2
= strtol(end
+1, &end
, 10);
554 if (*end
== c
&& isdigit(end
[1]))
555 num3
= strtol(end
+1, &end
, 10);
562 if (num
< 25 && num2
>= 0 && num2
< 60 && num3
>= 0 && num3
<= 60) {
575 refuse_future
= NULL
;
576 if (gmtime_r(&now
, &now_tm
))
577 refuse_future
= &now_tm
;
581 if (is_date(num
, num2
, num3
, NULL
, now
, tm
))
584 if (is_date(num
, num3
, num2
, NULL
, now
, tm
))
587 /* Our eastern European friends say dd.mm.yy[yy]
588 * is the norm there, so giving precedence to
589 * mm/dd/yy[yy] form only when separator is not '.'
592 is_date(num3
, num
, num2
, refuse_future
, now
, tm
))
594 /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
595 if (is_date(num3
, num2
, num
, refuse_future
, now
, tm
))
597 /* Funny European mm.dd.yy */
599 is_date(num3
, num
, num2
, refuse_future
, now
, tm
))
607 * Have we filled in any part of the time/date yet?
608 * We just do a binary 'and' to see if the sign bit
609 * is set in all the values.
611 static inline int nodate(struct tm
*tm
)
613 return (tm
->tm_year
&
622 * We've seen a digit. Time? Year? Date?
624 static int match_digit(const char *date
, struct tm
*tm
, int *offset
, int *tm_gmt
)
630 num
= parse_timestamp(date
, &end
, 10);
633 * Seconds since 1970? We trigger on that for any numbers with
634 * more than 8 digits. This is because we don't want to rule out
635 * numbers like 20070606 as a YYYYMMDD date.
637 if (num
>= 100000000 && nodate(tm
)) {
639 if (gmtime_r(&time
, tm
)) {
646 * Check for special formats: num[-.:/]num[same]num
653 if (isdigit(end
[1])) {
654 int match
= match_multi_number(num
, *end
, date
, end
, tm
, 0);
661 * None of the special formats? Try to guess what
662 * the number meant. We use the number of digits
663 * to make a more educated guess..
668 } while (isdigit(date
[n
]));
670 /* Four-digit year or a timezone? */
672 if (num
<= 1400 && *offset
== -1) {
673 unsigned int minutes
= num
% 100;
674 unsigned int hours
= num
/ 100;
675 *offset
= hours
*60 + minutes
;
676 } else if (num
> 1900 && num
< 2100)
677 tm
->tm_year
= num
- 1900;
682 * Ignore lots of numerals. We took care of 4-digit years above.
683 * Days or months must be one or two digits.
689 * NOTE! We will give precedence to day-of-month over month or
690 * year numbers in the 1-12 range. So 05 is always "mday 5",
691 * unless we already have a mday..
693 * IOW, 01 Apr 05 parses as "April 1st, 2005".
695 if (num
> 0 && num
< 32 && tm
->tm_mday
< 0) {
700 /* Two-digit year? */
701 if (n
== 2 && tm
->tm_year
< 0) {
702 if (num
< 10 && tm
->tm_mday
>= 0) {
703 tm
->tm_year
= num
+ 100;
712 if (num
> 0 && num
< 13 && tm
->tm_mon
< 0)
718 static int match_tz(const char *date
, int *offp
)
721 int hour
= strtoul(date
+ 1, &end
, 10);
722 int n
= end
- (date
+ 1);
730 min
= 99; /* random crap */
731 } else if (*end
== ':') {
733 min
= strtoul(end
+ 1, &end
, 10);
734 if (end
- (date
+ 1) != 5)
735 min
= 99; /* random crap */
736 } /* otherwise we parsed "hh" */
739 * Don't accept any random crap. Even though some places have
740 * offset larger than 12 hours (e.g. Pacific/Kiritimati is at
741 * UTC+14), there is something wrong if hour part is much
742 * larger than that. We might also want to check that the
743 * minutes are divisible by 15 or something too. (Offset of
744 * Kathmandu, Nepal is UTC+5:45)
746 if (min
< 60 && hour
< 24) {
747 int offset
= hour
* 60 + min
;
755 static void date_string(timestamp_t date
, int offset
, struct strbuf
*buf
)
763 strbuf_addf(buf
, "%"PRItime
" %c%02d%02d", date
, sign
, offset
/ 60, offset
% 60);
767 * Parse a string like "0 +0000" as ancient timestamp near epoch, but
768 * only when it appears not as part of any other string.
770 static int match_object_header_date(const char *date
, timestamp_t
*timestamp
, int *offset
)
776 if (*date
< '0' || '9' < *date
)
778 stamp
= parse_timestamp(date
, &end
, 10);
779 if (*end
!= ' ' || stamp
== TIME_MAX
|| (end
[1] != '+' && end
[1] != '-'))
782 ofs
= strtol(date
, &end
, 10);
783 if ((*end
!= '\0' && (*end
!= '\n')) || end
!= date
+ 4)
785 ofs
= (ofs
/ 100) * 60 + (ofs
% 100);
793 /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
794 (i.e. English) day/month names, and it doesn't work correctly with %z. */
795 int parse_date_basic(const char *date
, timestamp_t
*timestamp
, int *offset
)
799 timestamp_t dummy_timestamp
;
803 timestamp
= &dummy_timestamp
;
805 offset
= &dummy_offset
;
807 memset(&tm
, 0, sizeof(tm
));
819 !match_object_header_date(date
+ 1, timestamp
, offset
))
820 return 0; /* success */
823 unsigned char c
= *date
;
825 /* Stop at end of string or newline */
830 match
= match_alpha(date
, &tm
, offset
);
832 match
= match_digit(date
, &tm
, offset
, &tm_gmt
);
833 else if ((c
== '-' || c
== '+') && isdigit(date
[1]))
834 match
= match_tz(date
, offset
);
844 /* do not use mktime(), which uses local timezone, here */
845 *timestamp
= tm_to_time_t(&tm
);
846 if (*timestamp
== -1)
852 /* gmtime_r() in match_digit() may have clobbered it */
854 temp_time
= mktime(&tm
);
855 if ((time_t)*timestamp
> temp_time
) {
856 *offset
= ((time_t)*timestamp
- temp_time
) / 60;
858 *offset
= -(int)((temp_time
- (time_t)*timestamp
) / 60);
863 *timestamp
-= *offset
* 60;
864 return 0; /* success */
867 int parse_expiry_date(const char *date
, timestamp_t
*timestamp
)
871 if (!strcmp(date
, "never") || !strcmp(date
, "false"))
873 else if (!strcmp(date
, "all") || !strcmp(date
, "now"))
875 * We take over "now" here, which usually translates
876 * to the current timestamp. This is because the user
877 * really means to expire everything she has done in
878 * the past, and by definition reflogs are the record
879 * of the past, and there is nothing from the future
882 *timestamp
= TIME_MAX
;
884 *timestamp
= approxidate_careful(date
, &errors
);
889 int parse_date(const char *date
, struct strbuf
*result
)
891 timestamp_t timestamp
;
893 if (parse_date_basic(date
, ×tamp
, &offset
))
895 date_string(timestamp
, offset
, result
);
899 static enum date_mode_type
parse_date_type(const char *format
, const char **end
)
901 if (skip_prefix(format
, "relative", end
))
902 return DATE_RELATIVE
;
903 if (skip_prefix(format
, "iso8601-strict", end
) ||
904 skip_prefix(format
, "iso-strict", end
))
905 return DATE_ISO8601_STRICT
;
906 if (skip_prefix(format
, "iso8601", end
) ||
907 skip_prefix(format
, "iso", end
))
909 if (skip_prefix(format
, "rfc2822", end
) ||
910 skip_prefix(format
, "rfc", end
))
912 if (skip_prefix(format
, "short", end
))
914 if (skip_prefix(format
, "default", end
))
916 if (skip_prefix(format
, "human", end
))
918 if (skip_prefix(format
, "raw", end
))
920 if (skip_prefix(format
, "unix", end
))
922 if (skip_prefix(format
, "format", end
))
923 return DATE_STRFTIME
;
925 die("unknown date format %s", format
);
928 void parse_date_format(const char *format
, struct date_mode
*mode
)
932 /* "auto:foo" is "if tty/pager, then foo, otherwise normal" */
933 if (skip_prefix(format
, "auto:", &p
)) {
934 if (isatty(1) || pager_in_use())
940 /* historical alias */
941 if (!strcmp(format
, "local"))
942 format
= "default-local";
944 mode
->type
= parse_date_type(format
, &p
);
947 if (skip_prefix(p
, "-local", &p
))
950 if (mode
->type
== DATE_STRFTIME
) {
951 if (!skip_prefix(p
, ":", &p
))
952 die("date format missing colon separator: %s", format
);
953 mode
->strftime_fmt
= xstrdup(p
);
955 die("unknown date format %s", format
);
958 void datestamp(struct strbuf
*out
)
965 offset
= tm_to_time_t(localtime(&now
)) - now
;
968 date_string(now
, offset
, out
);
972 * Relative time update (eg "2 days ago"). If we haven't set the time
973 * yet, we need to set it from current time.
975 static time_t update_tm(struct tm
*tm
, struct tm
*now
, time_t sec
)
980 tm
->tm_mday
= now
->tm_mday
;
982 tm
->tm_mon
= now
->tm_mon
;
983 if (tm
->tm_year
< 0) {
984 tm
->tm_year
= now
->tm_year
;
985 if (tm
->tm_mon
> now
->tm_mon
)
989 n
= mktime(tm
) - sec
;
995 * Do we have a pending number at the end, or when
996 * we see a new one? Let's assume it's a month day,
997 * as in "Dec 6, 1992"
999 static void pending_number(struct tm
*tm
, int *num
)
1005 if (tm
->tm_mday
< 0 && number
< 32)
1006 tm
->tm_mday
= number
;
1007 else if (tm
->tm_mon
< 0 && number
< 13)
1008 tm
->tm_mon
= number
-1;
1009 else if (tm
->tm_year
< 0) {
1010 if (number
> 1969 && number
< 2100)
1011 tm
->tm_year
= number
- 1900;
1012 else if (number
> 69 && number
< 100)
1013 tm
->tm_year
= number
;
1014 else if (number
< 38)
1015 tm
->tm_year
= 100 + number
;
1016 /* We screw up for number = 00 ? */
1021 static void date_now(struct tm
*tm
, struct tm
*now
, int *num
)
1024 update_tm(tm
, now
, 0);
1027 static void date_yesterday(struct tm
*tm
, struct tm
*now
, int *num
)
1030 update_tm(tm
, now
, 24*60*60);
1033 static void date_time(struct tm
*tm
, struct tm
*now
, int hour
)
1035 if (tm
->tm_hour
< hour
)
1036 update_tm(tm
, now
, 24*60*60);
1042 static void date_midnight(struct tm
*tm
, struct tm
*now
, int *num
)
1044 pending_number(tm
, num
);
1045 date_time(tm
, now
, 0);
1048 static void date_noon(struct tm
*tm
, struct tm
*now
, int *num
)
1050 pending_number(tm
, num
);
1051 date_time(tm
, now
, 12);
1054 static void date_tea(struct tm
*tm
, struct tm
*now
, int *num
)
1056 pending_number(tm
, num
);
1057 date_time(tm
, now
, 17);
1060 static void date_pm(struct tm
*tm
, struct tm
*now
, int *num
)
1071 tm
->tm_hour
= (hour
% 12) + 12;
1074 static void date_am(struct tm
*tm
, struct tm
*now
, int *num
)
1085 tm
->tm_hour
= (hour
% 12);
1088 static void date_never(struct tm
*tm
, struct tm
*now
, int *num
)
1091 localtime_r(&n
, tm
);
1095 static const struct special
{
1097 void (*fn
)(struct tm
*, struct tm
*, int *);
1099 { "yesterday", date_yesterday
},
1100 { "noon", date_noon
},
1101 { "midnight", date_midnight
},
1102 { "tea", date_tea
},
1105 { "never", date_never
},
1106 { "now", date_now
},
1110 static const char *number_name
[] = {
1111 "zero", "one", "two", "three", "four",
1112 "five", "six", "seven", "eight", "nine", "ten",
1115 static const struct typelen
{
1122 { "days", 24*60*60 },
1123 { "weeks", 7*24*60*60 },
1127 static const char *approxidate_alpha(const char *date
, struct tm
*tm
, struct tm
*now
, int *num
, int *touched
)
1129 const struct typelen
*tl
;
1130 const struct special
*s
;
1131 const char *end
= date
;
1134 while (isalpha(*++end
))
1137 for (i
= 0; i
< 12; i
++) {
1138 int match
= match_string(date
, month_names
[i
]);
1146 for (s
= special
; s
->name
; s
++) {
1147 int len
= strlen(s
->name
);
1148 if (match_string(date
, s
->name
) == len
) {
1149 s
->fn(tm
, now
, num
);
1156 for (i
= 1; i
< 11; i
++) {
1157 int len
= strlen(number_name
[i
]);
1158 if (match_string(date
, number_name
[i
]) == len
) {
1164 if (match_string(date
, "last") == 4) {
1173 int len
= strlen(tl
->type
);
1174 if (match_string(date
, tl
->type
) >= len
-1) {
1175 update_tm(tm
, now
, tl
->length
* *num
);
1183 for (i
= 0; i
< 7; i
++) {
1184 int match
= match_string(date
, weekday_names
[i
]);
1186 int diff
, n
= *num
-1;
1189 diff
= tm
->tm_wday
- i
;
1194 update_tm(tm
, now
, diff
* 24 * 60 * 60);
1200 if (match_string(date
, "months") >= 5) {
1202 update_tm(tm
, now
, 0); /* fill in date fields if needed */
1203 n
= tm
->tm_mon
- *num
;
1214 if (match_string(date
, "years") >= 4) {
1215 update_tm(tm
, now
, 0); /* fill in date fields if needed */
1216 tm
->tm_year
-= *num
;
1225 static const char *approxidate_digit(const char *date
, struct tm
*tm
, int *num
,
1229 timestamp_t number
= parse_timestamp(date
, &end
, 10);
1236 if (isdigit(end
[1])) {
1237 int match
= match_multi_number(number
, *end
, date
, end
,
1240 return date
+ match
;
1244 /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
1245 if (date
[0] != '0' || end
- date
<= 2)
1250 static timestamp_t
approxidate_str(const char *date
,
1251 const struct timeval
*tv
,
1259 time_sec
= tv
->tv_sec
;
1260 localtime_r(&time_sec
, &tm
);
1268 unsigned char c
= *date
;
1273 pending_number(&tm
, &number
);
1274 date
= approxidate_digit(date
-1, &tm
, &number
, time_sec
);
1279 date
= approxidate_alpha(date
-1, &tm
, &now
, &number
, &touched
);
1281 pending_number(&tm
, &number
);
1284 return (timestamp_t
)update_tm(&tm
, &now
, 0);
1287 timestamp_t
approxidate_relative(const char *date
, const struct timeval
*tv
)
1289 timestamp_t timestamp
;
1293 if (!parse_date_basic(date
, ×tamp
, &offset
))
1295 return approxidate_str(date
, tv
, &errors
);
1298 timestamp_t
approxidate_careful(const char *date
, int *error_ret
)
1301 timestamp_t timestamp
;
1307 if (!parse_date_basic(date
, ×tamp
, &offset
)) {
1313 return approxidate_str(date
, &tv
, error_ret
);
1316 int date_overflows(timestamp_t t
)
1320 /* If we overflowed our timestamp data type, that's bad... */
1321 if ((uintmax_t)t
>= TIME_MAX
)
1325 * ...but we also are going to feed the result to system
1326 * functions that expect time_t, which is often "signed long".
1327 * Make sure that we fit into time_t, as well.
1330 return t
!= sys
|| (t
< 1) != (sys
< 1);