415 lines
9.2 KiB
C
415 lines
9.2 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <time.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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* 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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/*
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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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/* BAD CRAP */
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return 0;
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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, 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(char *date, struct tm *tm, int *offset)
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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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return end - date;
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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(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 < 3)
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return 0;
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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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return end - date;
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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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void parse_date(char *date, char *result, int maxlen)
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{
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struct tm tm;
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int offset, sign;
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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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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);
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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;
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then -= offset * 60;
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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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snprintf(result, maxlen, "%lu %c%02d%02d", then, sign, offset/60, offset % 60);
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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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snprintf(buf, bufsize, "%lu %+05d", now, offset/60*100 + offset%60);
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}
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