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01c6ad29bd
We generate the ASCII representation of our internal date representation ("seconds since 1970, UTC + timezone information") in two different places. One of them uses the stupid and obvious way to make sure that it gets the sexagecimal representation right for negative timezones even if they might not be exact hours, and the other one depends on the modulus operator always matching the sign of argument. Hey, the clever one works. And C90 even specifies that behaviour. But I had to think about it for a while when I was re-visiting this area, and even if I didn't have to, it's kind of strange to have two different ways to print out the same data format. So use a common helper for this. And select the stupid and straighforward way. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
463 lines
10 KiB
C
463 lines
10 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include <ctype.h>
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#include <time.h>
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#include "cache.h"
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static time_t my_mktime(struct tm *tm)
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{
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static const int mdays[] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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int year = tm->tm_year - 70;
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int month = tm->tm_mon;
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int day = tm->tm_mday;
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if (year < 0 || year > 129) /* algo only works for 1970-2099 */
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return -1;
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if (month < 0 || month > 11) /* array bounds */
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return -1;
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if (month < 2 || (year + 2) % 4)
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day--;
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return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
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tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
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}
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static const char *month_names[] = {
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"January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December"
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};
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static const char *weekday_names[] = {
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"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
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};
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/*
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* The "tz" thing is passed in as this strange "decimal parse of tz"
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* thing, which means that tz -0100 is passed in as the integer -100,
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* even though it means "sixty minutes off"
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*/
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const char *show_date(unsigned long time, int tz)
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{
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struct tm *tm;
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time_t t;
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static char timebuf[200];
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int minutes;
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minutes = tz < 0 ? -tz : tz;
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minutes = (minutes / 100)*60 + (minutes % 100);
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minutes = tz < 0 ? -minutes : minutes;
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t = time + minutes * 60;
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tm = gmtime(&t);
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if (!tm)
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return NULL;
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sprintf(timebuf, "%.3s %.3s %d %02d:%02d:%02d %d %+05d",
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weekday_names[tm->tm_wday],
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month_names[tm->tm_mon],
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tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec,
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tm->tm_year + 1900, tz);
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return timebuf;
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}
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/*
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* Check these. And note how it doesn't do the summer-time conversion.
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*
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* In my world, it's always summer, and things are probably a bit off
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* in other ways too.
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*/
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static const struct {
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const char *name;
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int offset;
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int dst;
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} timezone_names[] = {
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{ "IDLW", -12, 0, }, /* International Date Line West */
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{ "NT", -11, 0, }, /* Nome */
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{ "CAT", -10, 0, }, /* Central Alaska */
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{ "HST", -10, 0, }, /* Hawaii Standard */
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{ "HDT", -10, 1, }, /* Hawaii Daylight */
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{ "YST", -9, 0, }, /* Yukon Standard */
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{ "YDT", -9, 1, }, /* Yukon Daylight */
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{ "PST", -8, 0, }, /* Pacific Standard */
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{ "PDT", -8, 1, }, /* Pacific Daylight */
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{ "MST", -7, 0, }, /* Mountain Standard */
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{ "MDT", -7, 1, }, /* Mountain Daylight */
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{ "CST", -6, 0, }, /* Central Standard */
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{ "CDT", -6, 1, }, /* Central Daylight */
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{ "EST", -5, 0, }, /* Eastern Standard */
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{ "EDT", -5, 1, }, /* Eastern Daylight */
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{ "AST", -3, 0, }, /* Atlantic Standard */
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{ "ADT", -3, 1, }, /* Atlantic Daylight */
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{ "WAT", -1, 0, }, /* West Africa */
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{ "GMT", 0, 0, }, /* Greenwich Mean */
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{ "UTC", 0, 0, }, /* Universal (Coordinated) */
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{ "WET", 0, 0, }, /* Western European */
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{ "BST", 0, 1, }, /* British Summer */
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{ "CET", +1, 0, }, /* Central European */
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{ "MET", +1, 0, }, /* Middle European */
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{ "MEWT", +1, 0, }, /* Middle European Winter */
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{ "MEST", +1, 1, }, /* Middle European Summer */
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{ "CEST", +1, 1, }, /* Central European Summer */
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{ "MESZ", +1, 1, }, /* Middle European Summer */
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{ "FWT", +1, 0, }, /* French Winter */
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{ "FST", +1, 1, }, /* French Summer */
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{ "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
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{ "EEST", +2, 1, }, /* Eastern European Daylight */
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{ "WAST", +7, 0, }, /* West Australian Standard */
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{ "WADT", +7, 1, }, /* West Australian Daylight */
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{ "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
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{ "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
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{ "EAST", +10, 0, }, /* Eastern Australian Standard */
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{ "EADT", +10, 1, }, /* Eastern Australian Daylight */
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{ "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
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{ "NZT", +11, 0, }, /* New Zealand */
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{ "NZST", +11, 0, }, /* New Zealand Standard */
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{ "NZDT", +11, 1, }, /* New Zealand Daylight */
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{ "IDLE", +12, 0, }, /* International Date Line East */
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};
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#define NR_TZ (sizeof(timezone_names) / sizeof(timezone_names[0]))
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static int match_string(const char *date, const char *str)
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{
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int i = 0;
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for (i = 0; *date; date++, str++, i++) {
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if (*date == *str)
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continue;
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if (toupper(*date) == toupper(*str))
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continue;
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if (!isalnum(*date))
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break;
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return 0;
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}
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return i;
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}
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static int skip_alpha(const char *date)
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{
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int i = 0;
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do {
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i++;
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} while (isalpha(date[i]));
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return i;
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}
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/*
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* Parse month, weekday, or timezone name
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*/
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static int match_alpha(const char *date, struct tm *tm, int *offset)
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{
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int i;
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for (i = 0; i < 12; i++) {
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int match = match_string(date, month_names[i]);
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if (match >= 3) {
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tm->tm_mon = i;
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return match;
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}
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}
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for (i = 0; i < 7; i++) {
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int match = match_string(date, weekday_names[i]);
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if (match >= 3) {
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tm->tm_wday = i;
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return match;
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}
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}
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for (i = 0; i < NR_TZ; i++) {
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int match = match_string(date, timezone_names[i].name);
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if (match >= 3) {
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int off = timezone_names[i].offset;
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/* This is bogus, but we like summer */
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off += timezone_names[i].dst;
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/* Only use the tz name offset if we don't have anything better */
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if (*offset == -1)
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*offset = 60*off;
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return match;
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}
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}
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if (match_string(date, "PM") == 2) {
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if (tm->tm_hour > 0 && tm->tm_hour < 12)
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tm->tm_hour += 12;
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return 2;
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}
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/* BAD CRAP */
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return skip_alpha(date);
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}
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static int is_date(int year, int month, int day, struct tm *tm)
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{
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if (month > 0 && month < 13 && day > 0 && day < 32) {
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if (year == -1) {
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tm->tm_mon = month-1;
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tm->tm_mday = day;
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return 1;
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}
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if (year >= 1970 && year < 2100) {
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year -= 1900;
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} else if (year > 70 && year < 100) {
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/* ok */
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} else if (year < 38) {
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year += 100;
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} else
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return 0;
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tm->tm_mon = month-1;
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tm->tm_mday = day;
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tm->tm_year = year;
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return 1;
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}
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return 0;
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}
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static int match_multi_number(unsigned long num, char c, const char *date, char *end, struct tm *tm)
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{
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long num2, num3;
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num2 = strtol(end+1, &end, 10);
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num3 = -1;
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if (*end == c && isdigit(end[1]))
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num3 = strtol(end+1, &end, 10);
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/* Time? Date? */
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switch (c) {
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case ':':
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if (num3 < 0)
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num3 = 0;
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if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
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tm->tm_hour = num;
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tm->tm_min = num2;
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tm->tm_sec = num3;
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break;
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}
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return 0;
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case '-':
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case '/':
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if (num > 70) {
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/* yyyy-mm-dd? */
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if (is_date(num, num2, num3, tm))
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break;
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/* yyyy-dd-mm? */
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if (is_date(num, num3, num2, tm))
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break;
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}
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/* mm/dd/yy ? */
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if (is_date(num3, num2, num, tm))
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break;
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/* dd/mm/yy ? */
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if (is_date(num3, num, num2, tm))
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break;
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return 0;
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}
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return end - date;
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}
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/*
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* We've seen a digit. Time? Year? Date?
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*/
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static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
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{
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int n;
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char *end;
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unsigned long num;
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num = strtoul(date, &end, 10);
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/*
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* Seconds since 1970? We trigger on that for anything after Jan 1, 2000
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*/
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if (num > 946684800) {
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time_t time = num;
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if (gmtime_r(&time, tm)) {
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*tm_gmt = 1;
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return end - date;
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}
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}
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/*
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* Check for special formats: num[:-/]num[same]num
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*/
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switch (*end) {
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case ':':
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case '/':
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case '-':
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if (isdigit(end[1])) {
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int match = match_multi_number(num, *end, date, end, tm);
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if (match)
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return match;
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}
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}
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/*
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* None of the special formats? Try to guess what
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* the number meant. We use the number of digits
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* to make a more educated guess..
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*/
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n = 0;
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do {
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n++;
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} while (isdigit(date[n]));
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/* Four-digit year or a timezone? */
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if (n == 4) {
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if (num <= 1200 && *offset == -1) {
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unsigned int minutes = num % 100;
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unsigned int hours = num / 100;
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*offset = hours*60 + minutes;
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} else if (num > 1900 && num < 2100)
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tm->tm_year = num - 1900;
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return n;
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}
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/*
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* NOTE! We will give precedence to day-of-month over month or
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* year numebers in the 1-12 range. So 05 is always "mday 5",
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* unless we already have a mday..
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*
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* IOW, 01 Apr 05 parses as "April 1st, 2005".
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*/
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if (num > 0 && num < 32 && tm->tm_mday < 0) {
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tm->tm_mday = num;
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return n;
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}
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/* Two-digit year? */
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if (n == 2 && tm->tm_year < 0) {
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if (num < 10 && tm->tm_mday >= 0) {
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tm->tm_year = num + 100;
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return n;
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}
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if (num >= 70) {
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tm->tm_year = num;
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return n;
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}
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}
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if (num > 0 && num < 32) {
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tm->tm_mday = num;
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} else if (num > 1900) {
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tm->tm_year = num - 1900;
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} else if (num > 70) {
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tm->tm_year = num;
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} else if (num > 0 && num < 13) {
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tm->tm_mon = num-1;
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}
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return n;
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}
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static int match_tz(const char *date, int *offp)
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{
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char *end;
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int offset = strtoul(date+1, &end, 10);
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int min, hour;
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int n = end - date - 1;
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min = offset % 100;
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hour = offset / 100;
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/*
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* Don't accept any random crap.. At least 3 digits, and
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* a valid minute. We might want to check that the minutes
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* are divisible by 30 or something too.
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*/
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if (min < 60 && n > 2) {
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offset = hour*60+min;
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if (*date == '-')
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offset = -offset;
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*offp = offset;
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}
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return end - date;
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}
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static int date_string(unsigned long date, int offset, char *buf, int len)
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{
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int sign = '+';
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if (offset < 0) {
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offset = -offset;
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sign = '-';
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}
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return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
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}
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/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
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(i.e. English) day/month names, and it doesn't work correctly with %z. */
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int parse_date(const char *date, char *result, int maxlen)
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{
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struct tm tm;
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int offset, tm_gmt;
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time_t then;
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memset(&tm, 0, sizeof(tm));
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tm.tm_year = -1;
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tm.tm_mon = -1;
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tm.tm_mday = -1;
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tm.tm_isdst = -1;
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offset = -1;
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tm_gmt = 0;
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for (;;) {
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int match = 0;
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unsigned char c = *date;
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/* Stop at end of string or newline */
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if (!c || c == '\n')
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break;
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if (isalpha(c))
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match = match_alpha(date, &tm, &offset);
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else if (isdigit(c))
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match = match_digit(date, &tm, &offset, &tm_gmt);
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else if ((c == '-' || c == '+') && isdigit(date[1]))
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match = match_tz(date, &offset);
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if (!match) {
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/* BAD CRAP */
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match = 1;
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}
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date += match;
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}
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/* mktime uses local timezone */
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then = my_mktime(&tm);
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if (offset == -1)
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offset = (then - mktime(&tm)) / 60;
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if (then == -1)
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return -1;
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if (!tm_gmt)
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then -= offset * 60;
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return date_string(then, offset, result, maxlen);
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}
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void datestamp(char *buf, int bufsize)
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{
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time_t now;
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int offset;
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time(&now);
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offset = my_mktime(localtime(&now)) - now;
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offset /= 60;
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date_string(now, offset, buf, bufsize);
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}
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