Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: master
file 1135 lines (1005 sloc) 25.993 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/

#include "cache.h"

/*
* This is like mktime, but without normalization of tm_wday and tm_yday.
*/
static time_t tm_to_time_t(const struct tm *tm)
{
static const int mdays[] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
int year = tm->tm_year - 70;
int month = tm->tm_mon;
int day = tm->tm_mday;

if (year < 0 || year > 129) /* algo only works for 1970-2099 */
return -1;
if (month < 0 || month > 11) /* array bounds */
return -1;
if (month < 2 || (year + 2) % 4)
day--;
if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0)
return -1;
return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
}

static const char *month_names[] = {
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
};

static const char *weekday_names[] = {
"Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
};

static time_t gm_time_t(unsigned long time, int tz)
{
int minutes;

minutes = tz < 0 ? -tz : tz;
minutes = (minutes / 100)*60 + (minutes % 100);
minutes = tz < 0 ? -minutes : minutes;
return time + minutes * 60;
}

/*
* The "tz" thing is passed in as this strange "decimal parse of tz"
* thing, which means that tz -0100 is passed in as the integer -100,
* even though it means "sixty minutes off"
*/
static struct tm *time_to_tm(unsigned long time, int tz)
{
time_t t = gm_time_t(time, tz);
return gmtime(&t);
}

/*
* What value of "tz" was in effect back then at "time" in the
* local timezone?
*/
static int local_tzoffset(unsigned long time)
{
time_t t, t_local;
struct tm tm;
int offset, eastwest;

t = time;
localtime_r(&t, &tm);
t_local = tm_to_time_t(&tm);

if (t_local < t) {
eastwest = -1;
offset = t - t_local;
} else {
eastwest = 1;
offset = t_local - t;
}
offset /= 60; /* in minutes */
offset = (offset % 60) + ((offset / 60) * 100);
return offset * eastwest;
}

void show_date_relative(unsigned long time, int tz,
const struct timeval *now,
struct strbuf *timebuf)
{
unsigned long diff;
if (now->tv_sec < time) {
strbuf_addstr(timebuf, _("in the future"));
return;
}
diff = now->tv_sec - time;
if (diff < 90) {
strbuf_addf(timebuf,
Q_("%lu second ago", "%lu seconds ago", diff), diff);
return;
}
/* Turn it into minutes */
diff = (diff + 30) / 60;
if (diff < 90) {
strbuf_addf(timebuf,
Q_("%lu minute ago", "%lu minutes ago", diff), diff);
return;
}
/* Turn it into hours */
diff = (diff + 30) / 60;
if (diff < 36) {
strbuf_addf(timebuf,
Q_("%lu hour ago", "%lu hours ago", diff), diff);
return;
}
/* We deal with number of days from here on */
diff = (diff + 12) / 24;
if (diff < 14) {
strbuf_addf(timebuf,
Q_("%lu day ago", "%lu days ago", diff), diff);
return;
}
/* Say weeks for the past 10 weeks or so */
if (diff < 70) {
strbuf_addf(timebuf,
Q_("%lu week ago", "%lu weeks ago", (diff + 3) / 7),
(diff + 3) / 7);
return;
}
/* Say months for the past 12 months or so */
if (diff < 365) {
strbuf_addf(timebuf,
Q_("%lu month ago", "%lu months ago", (diff + 15) / 30),
(diff + 15) / 30);
return;
}
/* Give years and months for 5 years or so */
if (diff < 1825) {
unsigned long totalmonths = (diff * 12 * 2 + 365) / (365 * 2);
unsigned long years = totalmonths / 12;
unsigned long months = totalmonths % 12;
if (months) {
struct strbuf sb = STRBUF_INIT;
strbuf_addf(&sb, Q_("%lu year", "%lu years", years), years);
strbuf_addf(timebuf,
/* TRANSLATORS: "%s" is "<n> years" */
Q_("%s, %lu month ago", "%s, %lu months ago", months),
sb.buf, months);
strbuf_release(&sb);
} else
strbuf_addf(timebuf,
Q_("%lu year ago", "%lu years ago", years), years);
return;
}
/* Otherwise, just years. Centuries is probably overkill. */
strbuf_addf(timebuf,
Q_("%lu year ago", "%lu years ago", (diff + 183) / 365),
(diff + 183) / 365);
}

const char *show_date(unsigned long time, int tz, enum date_mode mode)
{
struct tm *tm;
static struct strbuf timebuf = STRBUF_INIT;

if (mode == DATE_RAW) {
strbuf_reset(&timebuf);
strbuf_addf(&timebuf, "%lu %+05d", time, tz);
return timebuf.buf;
}

if (mode == DATE_RELATIVE) {
struct timeval now;

strbuf_reset(&timebuf);
gettimeofday(&now, NULL);
show_date_relative(time, tz, &now, &timebuf);
return timebuf.buf;
}

if (mode == DATE_LOCAL)
tz = local_tzoffset(time);

tm = time_to_tm(time, tz);
if (!tm) {
tm = time_to_tm(0, 0);
tz = 0;
}

strbuf_reset(&timebuf);
if (mode == DATE_SHORT)
strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
tm->tm_mon + 1, tm->tm_mday);
else if (mode == DATE_ISO8601)
strbuf_addf(&timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
tm->tm_year + 1900,
tm->tm_mon + 1,
tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec,
tz);
else if (mode == DATE_RFC2822)
strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
weekday_names[tm->tm_wday], tm->tm_mday,
month_names[tm->tm_mon], tm->tm_year + 1900,
tm->tm_hour, tm->tm_min, tm->tm_sec, tz);
else
strbuf_addf(&timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d",
weekday_names[tm->tm_wday],
month_names[tm->tm_mon],
tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec,
tm->tm_year + 1900,
(mode == DATE_LOCAL) ? 0 : ' ',
tz);
return timebuf.buf;
}

/*
* Check these. And note how it doesn't do the summer-time conversion.
*
* In my world, it's always summer, and things are probably a bit off
* in other ways too.
*/
static const struct {
const char *name;
int offset;
int dst;
} timezone_names[] = {
{ "IDLW", -12, 0, }, /* International Date Line West */
{ "NT", -11, 0, }, /* Nome */
{ "CAT", -10, 0, }, /* Central Alaska */
{ "HST", -10, 0, }, /* Hawaii Standard */
{ "HDT", -10, 1, }, /* Hawaii Daylight */
{ "YST", -9, 0, }, /* Yukon Standard */
{ "YDT", -9, 1, }, /* Yukon Daylight */
{ "PST", -8, 0, }, /* Pacific Standard */
{ "PDT", -8, 1, }, /* Pacific Daylight */
{ "MST", -7, 0, }, /* Mountain Standard */
{ "MDT", -7, 1, }, /* Mountain Daylight */
{ "CST", -6, 0, }, /* Central Standard */
{ "CDT", -6, 1, }, /* Central Daylight */
{ "EST", -5, 0, }, /* Eastern Standard */
{ "EDT", -5, 1, }, /* Eastern Daylight */
{ "AST", -3, 0, }, /* Atlantic Standard */
{ "ADT", -3, 1, }, /* Atlantic Daylight */
{ "WAT", -1, 0, }, /* West Africa */

{ "GMT", 0, 0, }, /* Greenwich Mean */
{ "UTC", 0, 0, }, /* Universal (Coordinated) */
{ "Z", 0, 0, }, /* Zulu, alias for UTC */

{ "WET", 0, 0, }, /* Western European */
{ "BST", 0, 1, }, /* British Summer */
{ "CET", +1, 0, }, /* Central European */
{ "MET", +1, 0, }, /* Middle European */
{ "MEWT", +1, 0, }, /* Middle European Winter */
{ "MEST", +1, 1, }, /* Middle European Summer */
{ "CEST", +1, 1, }, /* Central European Summer */
{ "MESZ", +1, 1, }, /* Middle European Summer */
{ "FWT", +1, 0, }, /* French Winter */
{ "FST", +1, 1, }, /* French Summer */
{ "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
{ "EEST", +2, 1, }, /* Eastern European Daylight */
{ "WAST", +7, 0, }, /* West Australian Standard */
{ "WADT", +7, 1, }, /* West Australian Daylight */
{ "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
{ "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
{ "EAST", +10, 0, }, /* Eastern Australian Standard */
{ "EADT", +10, 1, }, /* Eastern Australian Daylight */
{ "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
{ "NZT", +12, 0, }, /* New Zealand */
{ "NZST", +12, 0, }, /* New Zealand Standard */
{ "NZDT", +12, 1, }, /* New Zealand Daylight */
{ "IDLE", +12, 0, }, /* International Date Line East */
};

static int match_string(const char *date, const char *str)
{
int i = 0;

for (i = 0; *date; date++, str++, i++) {
if (*date == *str)
continue;
if (toupper(*date) == toupper(*str))
continue;
if (!isalnum(*date))
break;
return 0;
}
return i;
}

static int skip_alpha(const char *date)
{
int i = 0;
do {
i++;
} while (isalpha(date[i]));
return i;
}

/*
* Parse month, weekday, or timezone name
*/
static int match_alpha(const char *date, struct tm *tm, int *offset)
{
int i;

for (i = 0; i < 12; i++) {
int match = match_string(date, month_names[i]);
if (match >= 3) {
tm->tm_mon = i;
return match;
}
}

for (i = 0; i < 7; i++) {
int match = match_string(date, weekday_names[i]);
if (match >= 3) {
tm->tm_wday = i;
return match;
}
}

for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
int match = match_string(date, timezone_names[i].name);
if (match >= 3 || match == strlen(timezone_names[i].name)) {
int off = timezone_names[i].offset;

/* This is bogus, but we like summer */
off += timezone_names[i].dst;

/* Only use the tz name offset if we don't have anything better */
if (*offset == -1)
*offset = 60*off;

return match;
}
}

if (match_string(date, "PM") == 2) {
tm->tm_hour = (tm->tm_hour % 12) + 12;
return 2;
}

if (match_string(date, "AM") == 2) {
tm->tm_hour = (tm->tm_hour % 12) + 0;
return 2;
}

/* BAD CRAP */
return skip_alpha(date);
}

static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
{
if (month > 0 && month < 13 && day > 0 && day < 32) {
struct tm check = *tm;
struct tm *r = (now_tm ? &check : tm);
time_t specified;

r->tm_mon = month - 1;
r->tm_mday = day;
if (year == -1) {
if (!now_tm)
return 1;
r->tm_year = now_tm->tm_year;
}
else if (year >= 1970 && year < 2100)
r->tm_year = year - 1900;
else if (year > 70 && year < 100)
r->tm_year = year;
else if (year < 38)
r->tm_year = year + 100;
else
return 0;
if (!now_tm)
return 1;

specified = tm_to_time_t(r);

/* Be it commit time or author time, it does not make
* sense to specify timestamp way into the future. Make
* sure it is not later than ten days from now...
*/
if ((specified != -1) && (now + 10*24*3600 < specified))
return 0;
tm->tm_mon = r->tm_mon;
tm->tm_mday = r->tm_mday;
if (year != -1)
tm->tm_year = r->tm_year;
return 1;
}
return 0;
}

static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm)
{
time_t now;
struct tm now_tm;
struct tm *refuse_future;
long num2, num3;

num2 = strtol(end+1, &end, 10);
num3 = -1;
if (*end == c && isdigit(end[1]))
num3 = strtol(end+1, &end, 10);

/* Time? Date? */
switch (c) {
case ':':
if (num3 < 0)
num3 = 0;
if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
tm->tm_hour = num;
tm->tm_min = num2;
tm->tm_sec = num3;
break;
}
return 0;

case '-':
case '/':
case '.':
now = time(NULL);
refuse_future = NULL;
if (gmtime_r(&now, &now_tm))
refuse_future = &now_tm;

if (num > 70) {
/* yyyy-mm-dd? */
if (is_date(num, num2, num3, refuse_future, now, tm))
break;
/* yyyy-dd-mm? */
if (is_date(num, num3, num2, refuse_future, now, tm))
break;
}
/* Our eastern European friends say dd.mm.yy[yy]
* is the norm there, so giving precedence to
* mm/dd/yy[yy] form only when separator is not '.'
*/
if (c != '.' &&
is_date(num3, num, num2, refuse_future, now, tm))
break;
/* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
if (is_date(num3, num2, num, refuse_future, now, tm))
break;
/* Funny European mm.dd.yy */
if (c == '.' &&
is_date(num3, num, num2, refuse_future, now, tm))
break;
return 0;
}
return end - date;
}

/*
* Have we filled in any part of the time/date yet?
* We just do a binary 'and' to see if the sign bit
* is set in all the values.
*/
static inline int nodate(struct tm *tm)
{
return (tm->tm_year &
tm->tm_mon &
tm->tm_mday &
tm->tm_hour &
tm->tm_min &
tm->tm_sec) < 0;
}

/*
* We've seen a digit. Time? Year? Date?
*/
static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
{
int n;
char *end;
unsigned long num;

num = strtoul(date, &end, 10);

/*
* Seconds since 1970? We trigger on that for any numbers with
* more than 8 digits. This is because we don't want to rule out
* numbers like 20070606 as a YYYYMMDD date.
*/
if (num >= 100000000 && nodate(tm)) {
time_t time = num;
if (gmtime_r(&time, tm)) {
*tm_gmt = 1;
return end - date;
}
}

/*
* Check for special formats: num[-.:/]num[same]num
*/
switch (*end) {
case ':':
case '.':
case '/':
case '-':
if (isdigit(end[1])) {
int match = match_multi_number(num, *end, date, end, tm);
if (match)
return match;
}
}

/*
* None of the special formats? Try to guess what
* the number meant. We use the number of digits
* to make a more educated guess..
*/
n = 0;
do {
n++;
} while (isdigit(date[n]));

/* Four-digit year or a timezone? */
if (n == 4) {
if (num <= 1400 && *offset == -1) {
unsigned int minutes = num % 100;
unsigned int hours = num / 100;
*offset = hours*60 + minutes;
} else if (num > 1900 && num < 2100)
tm->tm_year = num - 1900;
return n;
}

/*
* Ignore lots of numerals. We took care of 4-digit years above.
* Days or months must be one or two digits.
*/
if (n > 2)
return n;

/*
* NOTE! We will give precedence to day-of-month over month or
* year numbers in the 1-12 range. So 05 is always "mday 5",
* unless we already have a mday..
*
* IOW, 01 Apr 05 parses as "April 1st, 2005".
*/
if (num > 0 && num < 32 && tm->tm_mday < 0) {
tm->tm_mday = num;
return n;
}

/* Two-digit year? */
if (n == 2 && tm->tm_year < 0) {
if (num < 10 && tm->tm_mday >= 0) {
tm->tm_year = num + 100;
return n;
}
if (num >= 70) {
tm->tm_year = num;
return n;
}
}

if (num > 0 && num < 13 && tm->tm_mon < 0)
tm->tm_mon = num-1;

return n;
}

static int match_tz(const char *date, int *offp)
{
char *end;
int hour = strtoul(date + 1, &end, 10);
int n = end - (date + 1);
int min = 0;

if (n == 4) {
/* hhmm */
min = hour % 100;
hour = hour / 100;
} else if (n != 2) {
min = 99; /* random crap */
} else if (*end == ':') {
/* hh:mm? */
min = strtoul(end + 1, &end, 10);
if (end - (date + 1) != 5)
min = 99; /* random crap */
} /* otherwise we parsed "hh" */

/*
* Don't accept any random crap. Even though some places have
* offset larger than 12 hours (e.g. Pacific/Kiritimati is at
* UTC+14), there is something wrong if hour part is much
* larger than that. We might also want to check that the
* minutes are divisible by 15 or something too. (Offset of
* Kathmandu, Nepal is UTC+5:45)
*/
if (min < 60 && hour < 24) {
int offset = hour * 60 + min;
if (*date == '-')
offset = -offset;
*offp = offset;
}
return end - date;
}

static int date_string(unsigned long date, int offset, char *buf, int len)
{
int sign = '+';

if (offset < 0) {
offset = -offset;
sign = '-';
}
return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
}

/*
* Parse a string like "0 +0000" as ancient timestamp near epoch, but
* only when it appears not as part of any other string.
*/
static int match_object_header_date(const char *date, unsigned long *timestamp, int *offset)
{
char *end;
unsigned long stamp;
int ofs;

if (*date < '0' || '9' < *date)
return -1;
stamp = strtoul(date, &end, 10);
if (*end != ' ' || stamp == ULONG_MAX || (end[1] != '+' && end[1] != '-'))
return -1;
date = end + 2;
ofs = strtol(date, &end, 10);
if ((*end != '\0' && (*end != '\n')) || end != date + 4)
return -1;
ofs = (ofs / 100) * 60 + (ofs % 100);
if (date[-1] == '-')
ofs = -ofs;
*timestamp = stamp;
*offset = ofs;
return 0;
}

/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
(i.e. English) day/month names, and it doesn't work correctly with %z. */
int parse_date_basic(const char *date, unsigned long *timestamp, int *offset)
{
struct tm tm;
int tm_gmt;
unsigned long dummy_timestamp;
int dummy_offset;

if (!timestamp)
timestamp = &dummy_timestamp;
if (!offset)
offset = &dummy_offset;

memset(&tm, 0, sizeof(tm));
tm.tm_year = -1;
tm.tm_mon = -1;
tm.tm_mday = -1;
tm.tm_isdst = -1;
tm.tm_hour = -1;
tm.tm_min = -1;
tm.tm_sec = -1;
*offset = -1;
tm_gmt = 0;

if (*date == '@' &&
!match_object_header_date(date + 1, timestamp, offset))
return 0; /* success */
for (;;) {
int match = 0;
unsigned char c = *date;

/* Stop at end of string or newline */
if (!c || c == '\n')
break;

if (isalpha(c))
match = match_alpha(date, &tm, offset);
else if (isdigit(c))
match = match_digit(date, &tm, offset, &tm_gmt);
else if ((c == '-' || c == '+') && isdigit(date[1]))
match = match_tz(date, offset);

if (!match) {
/* BAD CRAP */
match = 1;
}

date += match;
}

/* mktime uses local timezone */
*timestamp = tm_to_time_t(&tm);
if (*offset == -1) {
time_t temp_time = mktime(&tm);
if ((time_t)*timestamp > temp_time) {
*offset = ((time_t)*timestamp - temp_time) / 60;
} else {
*offset = -(int)((temp_time - (time_t)*timestamp) / 60);
}
}

if (*timestamp == -1)
return -1;

if (!tm_gmt)
*timestamp -= *offset * 60;
return 0; /* success */
}

int parse_expiry_date(const char *date, unsigned long *timestamp)
{
int errors = 0;

if (!strcmp(date, "never") || !strcmp(date, "false"))
*timestamp = 0;
else if (!strcmp(date, "all") || !strcmp(date, "now"))
/*
* We take over "now" here, which usually translates
* to the current timestamp. This is because the user
* really means to expire everything she has done in
* the past, and by definition reflogs are the record
* of the past, and there is nothing from the future
* to be kept.
*/
*timestamp = ULONG_MAX;
else
*timestamp = approxidate_careful(date, &errors);

return errors;
}

int parse_date(const char *date, char *result, int maxlen)
{
unsigned long timestamp;
int offset;
if (parse_date_basic(date, &timestamp, &offset))
return -1;
return date_string(timestamp, offset, result, maxlen);
}

enum date_mode parse_date_format(const char *format)
{
if (!strcmp(format, "relative"))
return DATE_RELATIVE;
else if (!strcmp(format, "iso8601") ||
!strcmp(format, "iso"))
return DATE_ISO8601;
else if (!strcmp(format, "rfc2822") ||
!strcmp(format, "rfc"))
return DATE_RFC2822;
else if (!strcmp(format, "short"))
return DATE_SHORT;
else if (!strcmp(format, "local"))
return DATE_LOCAL;
else if (!strcmp(format, "default"))
return DATE_NORMAL;
else if (!strcmp(format, "raw"))
return DATE_RAW;
else
die("unknown date format %s", format);
}

void datestamp(char *buf, int bufsize)
{
time_t now;
int offset;

time(&now);

offset = tm_to_time_t(localtime(&now)) - now;
offset /= 60;

date_string(now, offset, buf, bufsize);
}

/*
* Relative time update (eg "2 days ago"). If we haven't set the time
* yet, we need to set it from current time.
*/
static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec)
{
time_t n;

if (tm->tm_mday < 0)
tm->tm_mday = now->tm_mday;
if (tm->tm_mon < 0)
tm->tm_mon = now->tm_mon;
if (tm->tm_year < 0) {
tm->tm_year = now->tm_year;
if (tm->tm_mon > now->tm_mon)
tm->tm_year--;
}

n = mktime(tm) - sec;
localtime_r(&n, tm);
return n;
}

static void date_now(struct tm *tm, struct tm *now, int *num)
{
update_tm(tm, now, 0);
}

static void date_yesterday(struct tm *tm, struct tm *now, int *num)
{
update_tm(tm, now, 24*60*60);
}

static void date_time(struct tm *tm, struct tm *now, int hour)
{
if (tm->tm_hour < hour)
date_yesterday(tm, now, NULL);
tm->tm_hour = hour;
tm->tm_min = 0;
tm->tm_sec = 0;
}

static void date_midnight(struct tm *tm, struct tm *now, int *num)
{
date_time(tm, now, 0);
}

static void date_noon(struct tm *tm, struct tm *now, int *num)
{
date_time(tm, now, 12);
}

static void date_tea(struct tm *tm, struct tm *now, int *num)
{
date_time(tm, now, 17);
}

static void date_pm(struct tm *tm, struct tm *now, int *num)
{
int hour, n = *num;
*num = 0;

hour = tm->tm_hour;
if (n) {
hour = n;
tm->tm_min = 0;
tm->tm_sec = 0;
}
tm->tm_hour = (hour % 12) + 12;
}

static void date_am(struct tm *tm, struct tm *now, int *num)
{
int hour, n = *num;
*num = 0;

hour = tm->tm_hour;
if (n) {
hour = n;
tm->tm_min = 0;
tm->tm_sec = 0;
}
tm->tm_hour = (hour % 12);
}

static void date_never(struct tm *tm, struct tm *now, int *num)
{
time_t n = 0;
localtime_r(&n, tm);
}

static const struct special {
const char *name;
void (*fn)(struct tm *, struct tm *, int *);
} special[] = {
{ "yesterday", date_yesterday },
{ "noon", date_noon },
{ "midnight", date_midnight },
{ "tea", date_tea },
{ "PM", date_pm },
{ "AM", date_am },
{ "never", date_never },
{ "now", date_now },
{ NULL }
};

static const char *number_name[] = {
"zero", "one", "two", "three", "four",
"five", "six", "seven", "eight", "nine", "ten",
};

static const struct typelen {
const char *type;
int length;
} typelen[] = {
{ "seconds", 1 },
{ "minutes", 60 },
{ "hours", 60*60 },
{ "days", 24*60*60 },
{ "weeks", 7*24*60*60 },
{ NULL }
};

static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched)
{
const struct typelen *tl;
const struct special *s;
const char *end = date;
int i;

while (isalpha(*++end))
;

for (i = 0; i < 12; i++) {
int match = match_string(date, month_names[i]);
if (match >= 3) {
tm->tm_mon = i;
*touched = 1;
return end;
}
}

for (s = special; s->name; s++) {
int len = strlen(s->name);
if (match_string(date, s->name) == len) {
s->fn(tm, now, num);
*touched = 1;
return end;
}
}

if (!*num) {
for (i = 1; i < 11; i++) {
int len = strlen(number_name[i]);
if (match_string(date, number_name[i]) == len) {
*num = i;
*touched = 1;
return end;
}
}
if (match_string(date, "last") == 4) {
*num = 1;
*touched = 1;
}
return end;
}

tl = typelen;
while (tl->type) {
int len = strlen(tl->type);
if (match_string(date, tl->type) >= len-1) {
update_tm(tm, now, tl->length * *num);
*num = 0;
*touched = 1;
return end;
}
tl++;
}

for (i = 0; i < 7; i++) {
int match = match_string(date, weekday_names[i]);
if (match >= 3) {
int diff, n = *num -1;
*num = 0;

diff = tm->tm_wday - i;
if (diff <= 0)
n++;
diff += 7*n;

update_tm(tm, now, diff * 24 * 60 * 60);
*touched = 1;
return end;
}
}

if (match_string(date, "months") >= 5) {
int n;
update_tm(tm, now, 0); /* fill in date fields if needed */
n = tm->tm_mon - *num;
*num = 0;
while (n < 0) {
n += 12;
tm->tm_year--;
}
tm->tm_mon = n;
*touched = 1;
return end;
}

if (match_string(date, "years") >= 4) {
update_tm(tm, now, 0); /* fill in date fields if needed */
tm->tm_year -= *num;
*num = 0;
*touched = 1;
return end;
}

return end;
}

static const char *approxidate_digit(const char *date, struct tm *tm, int *num)
{
char *end;
unsigned long number = strtoul(date, &end, 10);

switch (*end) {
case ':':
case '.':
case '/':
case '-':
if (isdigit(end[1])) {
int match = match_multi_number(number, *end, date, end, tm);
if (match)
return date + match;
}
}

/* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
if (date[0] != '0' || end - date <= 2)
*num = number;
return end;
}

/*
* Do we have a pending number at the end, or when
* we see a new one? Let's assume it's a month day,
* as in "Dec 6, 1992"
*/
static void pending_number(struct tm *tm, int *num)
{
int number = *num;

if (number) {
*num = 0;
if (tm->tm_mday < 0 && number < 32)
tm->tm_mday = number;
else if (tm->tm_mon < 0 && number < 13)
tm->tm_mon = number-1;
else if (tm->tm_year < 0) {
if (number > 1969 && number < 2100)
tm->tm_year = number - 1900;
else if (number > 69 && number < 100)
tm->tm_year = number;
else if (number < 38)
tm->tm_year = 100 + number;
/* We screw up for number = 00 ? */
}
}
}

static unsigned long approxidate_str(const char *date,
const struct timeval *tv,
int *error_ret)
{
int number = 0;
int touched = 0;
struct tm tm, now;
time_t time_sec;

time_sec = tv->tv_sec;
localtime_r(&time_sec, &tm);
now = tm;

tm.tm_year = -1;
tm.tm_mon = -1;
tm.tm_mday = -1;

for (;;) {
unsigned char c = *date;
if (!c)
break;
date++;
if (isdigit(c)) {
pending_number(&tm, &number);
date = approxidate_digit(date-1, &tm, &number);
touched = 1;
continue;
}
if (isalpha(c))
date = approxidate_alpha(date-1, &tm, &now, &number, &touched);
}
pending_number(&tm, &number);
if (!touched)
*error_ret = 1;
return update_tm(&tm, &now, 0);
}

unsigned long approxidate_relative(const char *date, const struct timeval *tv)
{
unsigned long timestamp;
int offset;
int errors = 0;

if (!parse_date_basic(date, &timestamp, &offset))
return timestamp;
return approxidate_str(date, tv, &errors);
}

unsigned long approxidate_careful(const char *date, int *error_ret)
{
struct timeval tv;
unsigned long timestamp;
int offset;
int dummy = 0;
if (!error_ret)
error_ret = &dummy;

if (!parse_date_basic(date, &timestamp, &offset)) {
*error_ret = 0;
return timestamp;
}

gettimeofday(&tv, NULL);
return approxidate_str(date, &tv, error_ret);
}

int date_overflows(unsigned long t)
{
time_t sys;

/* If we overflowed our unsigned long, that's bad... */
if (t == ULONG_MAX)
return 1;

/*
* ...but we also are going to feed the result to system
* functions that expect time_t, which is often "signed long".
* Make sure that we fit into time_t, as well.
*/
sys = t;
return t != sys || (t < 1) != (sys < 1);
}
Something went wrong with that request. Please try again.