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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
commitc8bae7493d2f2910b57f13ded012e86bdcfb0532 (patch)
tree24e09d9f84dec336720cf393e156089ca2835791 /date.c
parentInitial commit. (diff)
downloadgit-c8bae7493d2f2910b57f13ded012e86bdcfb0532.tar.xz
git-c8bae7493d2f2910b57f13ded012e86bdcfb0532.zip
Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'date.c')
-rw-r--r--date.c1378
1 files changed, 1378 insertions, 0 deletions
diff --git a/date.c b/date.c
new file mode 100644
index 0000000..53bd6a7
--- /dev/null
+++ b/date.c
@@ -0,0 +1,1378 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+
+#include "cache.h"
+#include "date.h"
+
+/*
+ * This is like mktime, but without normalization of tm_wday and tm_yday.
+ */
+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(timestamp_t time, int tz)
+{
+ int minutes;
+
+ minutes = tz < 0 ? -tz : tz;
+ minutes = (minutes / 100)*60 + (minutes % 100);
+ minutes = tz < 0 ? -minutes : minutes;
+
+ if (minutes > 0) {
+ if (unsigned_add_overflows(time, minutes * 60))
+ die("Timestamp+tz too large: %"PRItime" +%04d",
+ time, tz);
+ } else if (time < -minutes * 60)
+ die("Timestamp before Unix epoch: %"PRItime" %04d", time, tz);
+ time += minutes * 60;
+ if (date_overflows(time))
+ die("Timestamp too large for this system: %"PRItime, time);
+ return (time_t)time;
+}
+
+/*
+ * 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(timestamp_t time, int tz, struct tm *tm)
+{
+ time_t t = gm_time_t(time, tz);
+ return gmtime_r(&t, tm);
+}
+
+static struct tm *time_to_tm_local(timestamp_t time, struct tm *tm)
+{
+ time_t t = time;
+ return localtime_r(&t, tm);
+}
+
+/*
+ * Fill in the localtime 'struct tm' for the supplied time,
+ * and return the local tz.
+ */
+static int local_time_tzoffset(time_t t, struct tm *tm)
+{
+ time_t t_local;
+ int offset, eastwest;
+
+ localtime_r(&t, tm);
+ t_local = tm_to_time_t(tm);
+ if (t_local == -1)
+ return 0; /* error; just use +0000 */
+ 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;
+}
+
+/*
+ * What value of "tz" was in effect back then at "time" in the
+ * local timezone?
+ */
+static int local_tzoffset(timestamp_t time)
+{
+ struct tm tm;
+
+ if (date_overflows(time))
+ die("Timestamp too large for this system: %"PRItime, time);
+
+ return local_time_tzoffset((time_t)time, &tm);
+}
+
+static void get_time(struct timeval *now)
+{
+ const char *x;
+
+ x = getenv("GIT_TEST_DATE_NOW");
+ if (x) {
+ now->tv_sec = atoi(x);
+ now->tv_usec = 0;
+ }
+ else
+ gettimeofday(now, NULL);
+}
+
+void show_date_relative(timestamp_t time, struct strbuf *timebuf)
+{
+ struct timeval now;
+ timestamp_t diff;
+
+ get_time(&now);
+ if (now.tv_sec < time) {
+ strbuf_addstr(timebuf, _("in the future"));
+ return;
+ }
+ diff = now.tv_sec - time;
+ if (diff < 90) {
+ strbuf_addf(timebuf,
+ Q_("%"PRItime" second ago", "%"PRItime" seconds ago", diff), diff);
+ return;
+ }
+ /* Turn it into minutes */
+ diff = (diff + 30) / 60;
+ if (diff < 90) {
+ strbuf_addf(timebuf,
+ Q_("%"PRItime" minute ago", "%"PRItime" minutes ago", diff), diff);
+ return;
+ }
+ /* Turn it into hours */
+ diff = (diff + 30) / 60;
+ if (diff < 36) {
+ strbuf_addf(timebuf,
+ Q_("%"PRItime" hour ago", "%"PRItime" 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_("%"PRItime" day ago", "%"PRItime" days ago", diff), diff);
+ return;
+ }
+ /* Say weeks for the past 10 weeks or so */
+ if (diff < 70) {
+ strbuf_addf(timebuf,
+ Q_("%"PRItime" week ago", "%"PRItime" 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_("%"PRItime" month ago", "%"PRItime" months ago", (diff + 15) / 30),
+ (diff + 15) / 30);
+ return;
+ }
+ /* Give years and months for 5 years or so */
+ if (diff < 1825) {
+ timestamp_t totalmonths = (diff * 12 * 2 + 365) / (365 * 2);
+ timestamp_t years = totalmonths / 12;
+ timestamp_t months = totalmonths % 12;
+ if (months) {
+ struct strbuf sb = STRBUF_INIT;
+ strbuf_addf(&sb, Q_("%"PRItime" year", "%"PRItime" years", years), years);
+ strbuf_addf(timebuf,
+ /* TRANSLATORS: "%s" is "<n> years" */
+ Q_("%s, %"PRItime" month ago", "%s, %"PRItime" months ago", months),
+ sb.buf, months);
+ strbuf_release(&sb);
+ } else
+ strbuf_addf(timebuf,
+ Q_("%"PRItime" year ago", "%"PRItime" years ago", years), years);
+ return;
+ }
+ /* Otherwise, just years. Centuries is probably overkill. */
+ strbuf_addf(timebuf,
+ Q_("%"PRItime" year ago", "%"PRItime" years ago", (diff + 183) / 365),
+ (diff + 183) / 365);
+}
+
+struct date_mode *date_mode_from_type(enum date_mode_type type)
+{
+ static struct date_mode mode = DATE_MODE_INIT;
+ if (type == DATE_STRFTIME)
+ BUG("cannot create anonymous strftime date_mode struct");
+ mode.type = type;
+ return &mode;
+}
+
+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)
+{
+ struct {
+ unsigned int year:1,
+ date:1,
+ wday:1,
+ time:1,
+ seconds:1,
+ tz:1;
+ } hide = { 0 };
+
+ hide.tz = local || tz == human_tz;
+ hide.year = tm->tm_year == human_tm->tm_year;
+ if (hide.year) {
+ if (tm->tm_mon == human_tm->tm_mon) {
+ if (tm->tm_mday > human_tm->tm_mday) {
+ /* Future date: think timezones */
+ } else if (tm->tm_mday == human_tm->tm_mday) {
+ hide.date = hide.wday = 1;
+ } else if (tm->tm_mday + 5 > human_tm->tm_mday) {
+ /* Leave just weekday if it was a few days ago */
+ hide.date = 1;
+ }
+ }
+ }
+
+ /* Show "today" times as just relative times */
+ if (hide.wday) {
+ show_date_relative(time, buf);
+ return;
+ }
+
+ /*
+ * Always hide seconds for human-readable.
+ * Hide timezone if showing date.
+ * Hide weekday and time if showing year.
+ *
+ * The logic here is two-fold:
+ * (a) only show details when recent enough to matter
+ * (b) keep the maximum length "similar", and in check
+ */
+ if (human_tm->tm_year) {
+ hide.seconds = 1;
+ hide.tz |= !hide.date;
+ hide.wday = hide.time = !hide.year;
+ }
+
+ if (!hide.wday)
+ strbuf_addf(buf, "%.3s ", weekday_names[tm->tm_wday]);
+ if (!hide.date)
+ strbuf_addf(buf, "%.3s %d ", month_names[tm->tm_mon], tm->tm_mday);
+
+ /* Do we want AM/PM depending on locale? */
+ if (!hide.time) {
+ strbuf_addf(buf, "%02d:%02d", tm->tm_hour, tm->tm_min);
+ if (!hide.seconds)
+ strbuf_addf(buf, ":%02d", tm->tm_sec);
+ } else
+ strbuf_rtrim(buf);
+
+ if (!hide.year)
+ strbuf_addf(buf, " %d", tm->tm_year + 1900);
+
+ if (!hide.tz)
+ strbuf_addf(buf, " %+05d", tz);
+}
+
+const char *show_date(timestamp_t time, int tz, const struct date_mode *mode)
+{
+ struct tm *tm;
+ struct tm tmbuf = { 0 };
+ struct tm human_tm = { 0 };
+ int human_tz = -1;
+ static struct strbuf timebuf = STRBUF_INIT;
+
+ if (mode->type == DATE_UNIX) {
+ strbuf_reset(&timebuf);
+ strbuf_addf(&timebuf, "%"PRItime, time);
+ return timebuf.buf;
+ }
+
+ if (mode->type == DATE_HUMAN) {
+ struct timeval now;
+
+ get_time(&now);
+
+ /* Fill in the data for "current time" in human_tz and human_tm */
+ human_tz = local_time_tzoffset(now.tv_sec, &human_tm);
+ }
+
+ if (mode->local)
+ tz = local_tzoffset(time);
+
+ if (mode->type == DATE_RAW) {
+ strbuf_reset(&timebuf);
+ strbuf_addf(&timebuf, "%"PRItime" %+05d", time, tz);
+ return timebuf.buf;
+ }
+
+ if (mode->type == DATE_RELATIVE) {
+ strbuf_reset(&timebuf);
+ show_date_relative(time, &timebuf);
+ return timebuf.buf;
+ }
+
+ if (mode->local)
+ tm = time_to_tm_local(time, &tmbuf);
+ else
+ tm = time_to_tm(time, tz, &tmbuf);
+ if (!tm) {
+ tm = time_to_tm(0, 0, &tmbuf);
+ tz = 0;
+ }
+
+ strbuf_reset(&timebuf);
+ if (mode->type == DATE_SHORT)
+ strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
+ tm->tm_mon + 1, tm->tm_mday);
+ else if (mode->type == 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->type == DATE_ISO8601_STRICT) {
+ char sign = (tz >= 0) ? '+' : '-';
+ tz = abs(tz);
+ strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d",
+ tm->tm_year + 1900,
+ tm->tm_mon + 1,
+ tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec,
+ sign, tz / 100, tz % 100);
+ } else if (mode->type == 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 if (mode->type == DATE_STRFTIME)
+ strbuf_addftime(&timebuf, mode->strftime_fmt, tm, tz,
+ !mode->local);
+ else
+ show_date_normal(&timebuf, time, tm, tz, &human_tm, human_tz, mode->local);
+ 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 set_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 -1;
+ if (!now_tm)
+ return 0;
+
+ 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 -1;
+ tm->tm_mon = r->tm_mon;
+ tm->tm_mday = r->tm_mday;
+ if (year != -1)
+ tm->tm_year = r->tm_year;
+ return 0;
+ }
+ return -1;
+}
+
+static int set_time(long hour, long minute, long second, struct tm *tm)
+{
+ /* We accept 61st second because of leap second */
+ if (0 <= hour && hour <= 24 &&
+ 0 <= minute && minute < 60 &&
+ 0 <= second && second <= 60) {
+ tm->tm_hour = hour;
+ tm->tm_min = minute;
+ tm->tm_sec = second;
+ return 0;
+ }
+ return -1;
+}
+
+static int is_date_known(struct tm *tm)
+{
+ return tm->tm_year != -1 && tm->tm_mon != -1 && tm->tm_mday != -1;
+}
+
+static int match_multi_number(timestamp_t 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 (set_time(num, num2, num3, tm) == 0) {
+ /*
+ * If %H:%M:%S was just parsed followed by: .<num4>
+ * Consider (& discard) it as fractional second
+ * if %Y%m%d is parsed before.
+ */
+ if (*end == '.' && isdigit(end[1]) && is_date_known(tm))
+ strtol(end + 1, &end, 10);
+ break;
+ }
+ return 0;
+
+ case '-':
+ case '/':
+ case '.':
+ if (!now)
+ now = time(NULL);
+ refuse_future = NULL;
+ if (gmtime_r(&now, &now_tm))
+ refuse_future = &now_tm;
+
+ if (num > 70) {
+ /* yyyy-mm-dd? */
+ if (set_date(num, num2, num3, NULL, now, tm) == 0)
+ break;
+ /* yyyy-dd-mm? */
+ if (set_date(num, num3, num2, NULL, now, tm) == 0)
+ 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 != '.' &&
+ set_date(num3, num, num2, refuse_future, now, tm) == 0)
+ break;
+ /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
+ if (set_date(num3, num2, num, refuse_future, now, tm) == 0)
+ break;
+ /* Funny European mm.dd.yy */
+ if (c == '.' &&
+ set_date(num3, num, num2, refuse_future, now, tm) == 0)
+ 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;
+ timestamp_t num;
+
+ num = parse_timestamp(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, 0);
+ 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]));
+
+ /* 8 digits, compact style of ISO-8601's date: YYYYmmDD */
+ /* 6 digits, compact style of ISO-8601's time: HHMMSS */
+ if (n == 8 || n == 6) {
+ unsigned int num1 = num / 10000;
+ unsigned int num2 = (num % 10000) / 100;
+ unsigned int num3 = num % 100;
+ if (n == 8)
+ set_date(num1, num2, num3, NULL, time(NULL), tm);
+ else if (n == 6 && set_time(num1, num2, num3, tm) == 0 &&
+ *end == '.' && isdigit(end[1]))
+ strtoul(end + 1, &end, 10);
+ return end - date;
+ }
+
+ /* 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 void date_string(timestamp_t date, int offset, struct strbuf *buf)
+{
+ int sign = '+';
+
+ if (offset < 0) {
+ offset = -offset;
+ sign = '-';
+ }
+ strbuf_addf(buf, "%"PRItime" %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, timestamp_t *timestamp, int *offset)
+{
+ char *end;
+ timestamp_t stamp;
+ int ofs;
+
+ if (*date < '0' || '9' < *date)
+ return -1;
+ stamp = parse_timestamp(date, &end, 10);
+ if (*end != ' ' || stamp == TIME_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, timestamp_t *timestamp, int *offset)
+{
+ struct tm tm;
+ int tm_gmt;
+ timestamp_t 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;
+ }
+
+ /* do not use mktime(), which uses local timezone, here */
+ *timestamp = tm_to_time_t(&tm);
+ if (*timestamp == -1)
+ return -1;
+
+ if (*offset == -1) {
+ time_t temp_time;
+
+ /* gmtime_r() in match_digit() may have clobbered it */
+ tm.tm_isdst = -1;
+ 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 (!tm_gmt)
+ *timestamp -= *offset * 60;
+ return 0; /* success */
+}
+
+int parse_expiry_date(const char *date, timestamp_t *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 that was 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 = TIME_MAX;
+ else
+ *timestamp = approxidate_careful(date, &errors);
+
+ return errors;
+}
+
+int parse_date(const char *date, struct strbuf *result)
+{
+ timestamp_t timestamp;
+ int offset;
+ if (parse_date_basic(date, &timestamp, &offset))
+ return -1;
+ date_string(timestamp, offset, result);
+ return 0;
+}
+
+static enum date_mode_type parse_date_type(const char *format, const char **end)
+{
+ if (skip_prefix(format, "relative", end))
+ return DATE_RELATIVE;
+ if (skip_prefix(format, "iso8601-strict", end) ||
+ skip_prefix(format, "iso-strict", end))
+ return DATE_ISO8601_STRICT;
+ if (skip_prefix(format, "iso8601", end) ||
+ skip_prefix(format, "iso", end))
+ return DATE_ISO8601;
+ if (skip_prefix(format, "rfc2822", end) ||
+ skip_prefix(format, "rfc", end))
+ return DATE_RFC2822;
+ if (skip_prefix(format, "short", end))
+ return DATE_SHORT;
+ if (skip_prefix(format, "default", end))
+ return DATE_NORMAL;
+ if (skip_prefix(format, "human", end))
+ return DATE_HUMAN;
+ if (skip_prefix(format, "raw", end))
+ return DATE_RAW;
+ if (skip_prefix(format, "unix", end))
+ return DATE_UNIX;
+ if (skip_prefix(format, "format", end))
+ return DATE_STRFTIME;
+ /*
+ * Please update $__git_log_date_formats in
+ * git-completion.bash when you add new formats.
+ */
+
+ die("unknown date format %s", format);
+}
+
+void parse_date_format(const char *format, struct date_mode *mode)
+{
+ const char *p;
+
+ /* "auto:foo" is "if tty/pager, then foo, otherwise normal" */
+ if (skip_prefix(format, "auto:", &p)) {
+ if (isatty(1) || pager_in_use())
+ format = p;
+ else
+ format = "default";
+ }
+
+ /* historical alias */
+ if (!strcmp(format, "local"))
+ format = "default-local";
+
+ mode->type = parse_date_type(format, &p);
+ mode->local = 0;
+
+ if (skip_prefix(p, "-local", &p))
+ mode->local = 1;
+
+ if (mode->type == DATE_STRFTIME) {
+ if (!skip_prefix(p, ":", &p))
+ die("date format missing colon separator: %s", format);
+ mode->strftime_fmt = xstrdup(p);
+ } else if (*p)
+ die("unknown date format %s", format);
+}
+
+void date_mode_release(struct date_mode *mode)
+{
+ free((char *)mode->strftime_fmt);
+}
+
+void datestamp(struct strbuf *out)
+{
+ time_t now;
+ int offset;
+ struct tm tm = { 0 };
+
+ time(&now);
+
+ offset = tm_to_time_t(localtime_r(&now, &tm)) - now;
+ offset /= 60;
+
+ date_string(now, offset, out);
+}
+
+/*
+ * Relative time update (eg "2 days ago"). If we haven't set the time
+ * yet, we need to set it from current time.
+ */
+static time_t update_tm(struct tm *tm, struct tm *now, time_t 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;
+}
+
+/*
+ * 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 void date_now(struct tm *tm, struct tm *now, int *num)
+{
+ *num = 0;
+ update_tm(tm, now, 0);
+}
+
+static void date_yesterday(struct tm *tm, struct tm *now, int *num)
+{
+ *num = 0;
+ update_tm(tm, now, 24*60*60);
+}
+
+static void date_time(struct tm *tm, struct tm *now, int hour)
+{
+ if (tm->tm_hour < hour)
+ update_tm(tm, now, 24*60*60);
+ tm->tm_hour = hour;
+ tm->tm_min = 0;
+ tm->tm_sec = 0;
+}
+
+static void date_midnight(struct tm *tm, struct tm *now, int *num)
+{
+ pending_number(tm, num);
+ date_time(tm, now, 0);
+}
+
+static void date_noon(struct tm *tm, struct tm *now, int *num)
+{
+ pending_number(tm, num);
+ date_time(tm, now, 12);
+}
+
+static void date_tea(struct tm *tm, struct tm *now, int *num)
+{
+ pending_number(tm, num);
+ date_time(tm, now, 17);
+}
+
+static void date_pm(struct tm *tm, struct tm *now UNUSED, 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 UNUSED, 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 UNUSED, int *num)
+{
+ time_t n = 0;
+ localtime_r(&n, tm);
+ *num = 0;
+}
+
+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,
+ time_t now)
+{
+ char *end;
+ timestamp_t number = parse_timestamp(date, &end, 10);
+
+ switch (*end) {
+ case ':':
+ case '.':
+ case '/':
+ case '-':
+ if (isdigit(end[1])) {
+ int match = match_multi_number(number, *end, date, end,
+ tm, now);
+ 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;
+}
+
+static timestamp_t 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, time_sec);
+ 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 (timestamp_t)update_tm(&tm, &now, 0);
+}
+
+timestamp_t approxidate_relative(const char *date)
+{
+ struct timeval tv;
+ timestamp_t timestamp;
+ int offset;
+ int errors = 0;
+
+ if (!parse_date_basic(date, &timestamp, &offset))
+ return timestamp;
+
+ get_time(&tv);
+ return approxidate_str(date, (const struct timeval *) &tv, &errors);
+}
+
+timestamp_t approxidate_careful(const char *date, int *error_ret)
+{
+ struct timeval tv;
+ timestamp_t timestamp;
+ int offset;
+ int dummy = 0;
+ if (!error_ret)
+ error_ret = &dummy;
+
+ if (!parse_date_basic(date, &timestamp, &offset)) {
+ *error_ret = 0;
+ return timestamp;
+ }
+
+ get_time(&tv);
+ return approxidate_str(date, &tv, error_ret);
+}
+
+int date_overflows(timestamp_t t)
+{
+ time_t sys;
+
+ /* If we overflowed our timestamp data type, that's bad... */
+ if ((uintmax_t)t >= TIME_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);
+}