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date.c
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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#define DISABLE_SIGN_COMPARE_WARNINGS
#include "git-compat-util.h"
#include "date.h"
#include "gettext.h"
#include "pager.h"
#include "strbuf.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)
{
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, 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) {
strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d:%02d:%02d",
tm->tm_year + 1900,
tm->tm_mon + 1,
tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
if (tz == 0) {
strbuf_addch(&timebuf, 'Z');
} else {
strbuf_addch(&timebuf, tz >= 0 ? '+' : '-');
tz = abs(tz);
strbuf_addf(&timebuf, "%02d:%02d", 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;
}
/* ISO-8601 allows yyyymmDD'T'HHMMSS, with less precision */
if (*date == 'T' && isdigit(date[1]) && tm->tm_hour == -1) {
tm->tm_min = tm->tm_sec = 0;
return 1;
}
/* 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;
}
/*
* Have we seen an ISO-8601-alike date, i.e. 20220101T0,
* In which, hour is still unset,
* and minutes and second has been set to 0.
*/
static inline int maybeiso8601(struct tm *tm)
{
return tm->tm_hour == -1 &&
tm->tm_min == 0 &&
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;
}
/* reduced precision of ISO-8601's time: HHMM or HH */
if (maybeiso8601(tm)) {
unsigned int num1 = num;
unsigned int num2 = 0;
if (n == 4) {
num1 = num / 100;
num2 = num % 100;
}
if ((n == 4 || n == 2) && !nodate(tm) &&
set_time(num1, num2, 0, tm) == 0)
return n;
/*
* We thought this is an ISO-8601 time string,
* we set minutes and seconds to 0,
* turn out it isn't, rollback the change.
*/
tm->tm_min = tm->tm_sec = -1;
}
/* 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;
}
/* timestamp of 2099-12-31T23:59:59Z, including 32 leap days */
static const timestamp_t timestamp_max = (((timestamp_t)2100 - 1970) * 365 + 32) * 24 * 60 * 60 - 1;
/* 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) {
if (*offset > 0 && *offset * 60 > *timestamp)
return -1;
if (*offset < 0 && -*offset * 60 > timestamp_max - *timestamp)
return -1;
*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, ×tamp, &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))