mirror of
https://github.com/git/git
synced 2024-10-30 04:01:21 +00:00
459 lines
10 KiB
C
459 lines
10 KiB
C
/*
|
|
* GIT - The information manager from hell
|
|
*
|
|
* Copyright (C) Linus Torvalds, 2005
|
|
*/
|
|
|
|
#include <ctype.h>
|
|
#include <time.h>
|
|
|
|
#include "cache.h"
|
|
|
|
static time_t my_mktime(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--;
|
|
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[] = {
|
|
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
|
|
};
|
|
|
|
/*
|
|
* 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"
|
|
*/
|
|
const char *show_date(unsigned long time, int tz)
|
|
{
|
|
struct tm *tm;
|
|
time_t t;
|
|
static char timebuf[200];
|
|
int minutes;
|
|
|
|
minutes = tz < 0 ? -tz : tz;
|
|
minutes = (minutes / 100)*60 + (minutes % 100);
|
|
minutes = tz < 0 ? -minutes : minutes;
|
|
t = time + minutes * 60;
|
|
tm = gmtime(&t);
|
|
if (!tm)
|
|
return NULL;
|
|
sprintf(timebuf, "%.3s %.3s %d %02d:%02d:%02d %d %+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, tz);
|
|
return timebuf;
|
|
}
|
|
|
|
/*
|
|
* 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) */
|
|
|
|
{ "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", +11, 0, }, /* New Zealand */
|
|
{ "NZST", +11, 0, }, /* New Zealand Standard */
|
|
{ "NZDT", +11, 1, }, /* New Zealand Daylight */
|
|
{ "IDLE", +12, 0, }, /* International Date Line East */
|
|
};
|
|
|
|
#define NR_TZ (sizeof(timezone_names) / sizeof(timezone_names[0]))
|
|
|
|
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 < NR_TZ; i++) {
|
|
int match = match_string(date, timezone_names[i].name);
|
|
if (match >= 3) {
|
|
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) {
|
|
if (tm->tm_hour > 0 && tm->tm_hour < 12)
|
|
tm->tm_hour += 12;
|
|
return 2;
|
|
}
|
|
|
|
/* BAD CRAP */
|
|
return skip_alpha(date);
|
|
}
|
|
|
|
static int is_date(int year, int month, int day, struct tm *tm)
|
|
{
|
|
if (month > 0 && month < 13 && day > 0 && day < 32) {
|
|
if (year == -1) {
|
|
tm->tm_mon = month-1;
|
|
tm->tm_mday = day;
|
|
return 1;
|
|
}
|
|
if (year >= 1970 && year < 2100) {
|
|
year -= 1900;
|
|
} else if (year > 70 && year < 100) {
|
|
/* ok */
|
|
} else if (year < 38) {
|
|
year += 100;
|
|
} else
|
|
return 0;
|
|
|
|
tm->tm_mon = month-1;
|
|
tm->tm_mday = day;
|
|
tm->tm_year = year;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm)
|
|
{
|
|
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 '/':
|
|
if (num > 70) {
|
|
/* yyyy-mm-dd? */
|
|
if (is_date(num, num2, num3, tm))
|
|
break;
|
|
/* yyyy-dd-mm? */
|
|
if (is_date(num, num3, num2, tm))
|
|
break;
|
|
}
|
|
/* mm/dd/yy ? */
|
|
if (is_date(num3, num2, num, tm))
|
|
break;
|
|
/* dd/mm/yy ? */
|
|
if (is_date(num3, num, num2, tm))
|
|
break;
|
|
return 0;
|
|
}
|
|
return end - date;
|
|
}
|
|
|
|
/*
|
|
* 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 anything after Jan 1, 2000
|
|
*/
|
|
if (num > 946684800) {
|
|
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 '-':
|
|
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 <= 1200 && *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;
|
|
}
|
|
|
|
/*
|
|
* NOTE! We will give precedence to day-of-month over month or
|
|
* year numebers 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 < 32) {
|
|
tm->tm_mday = num;
|
|
} else if (num > 1900) {
|
|
tm->tm_year = num - 1900;
|
|
} else if (num > 70) {
|
|
tm->tm_year = num;
|
|
} else if (num > 0 && num < 13) {
|
|
tm->tm_mon = num-1;
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
static int match_tz(const char *date, int *offp)
|
|
{
|
|
char *end;
|
|
int offset = strtoul(date+1, &end, 10);
|
|
int min, hour;
|
|
int n = end - date - 1;
|
|
|
|
min = offset % 100;
|
|
hour = offset / 100;
|
|
|
|
/*
|
|
* Don't accept any random crap.. At least 3 digits, and
|
|
* a valid minute. We might want to check that the minutes
|
|
* are divisible by 30 or something too.
|
|
*/
|
|
if (min < 60 && n > 2) {
|
|
offset = hour*60+min;
|
|
if (*date == '-')
|
|
offset = -offset;
|
|
|
|
*offp = offset;
|
|
}
|
|
return end - date;
|
|
}
|
|
|
|
/* 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. */
|
|
void parse_date(const char *date, char *result, int maxlen)
|
|
{
|
|
struct tm tm;
|
|
int offset, sign, tm_gmt;
|
|
time_t then;
|
|
|
|
memset(&tm, 0, sizeof(tm));
|
|
tm.tm_year = -1;
|
|
tm.tm_mon = -1;
|
|
tm.tm_mday = -1;
|
|
tm.tm_isdst = -1;
|
|
offset = -1;
|
|
tm_gmt = 0;
|
|
|
|
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 */
|
|
then = my_mktime(&tm);
|
|
if (offset == -1)
|
|
offset = (then - mktime(&tm)) / 60;
|
|
|
|
if (then == -1)
|
|
return;
|
|
|
|
if (!tm_gmt)
|
|
then -= offset * 60;
|
|
|
|
sign = '+';
|
|
if (offset < 0) {
|
|
offset = -offset;
|
|
sign = '-';
|
|
}
|
|
|
|
snprintf(result, maxlen, "%lu %c%02d%02d", then, sign, offset/60, offset % 60);
|
|
}
|
|
|
|
void datestamp(char *buf, int bufsize)
|
|
{
|
|
time_t now;
|
|
int offset;
|
|
|
|
time(&now);
|
|
|
|
offset = my_mktime(localtime(&now)) - now;
|
|
offset /= 60;
|
|
|
|
snprintf(buf, bufsize, "%lu %+05d", now, offset/60*100 + offset%60);
|
|
}
|