| /* |
| * GIT - The information manager from hell |
| * |
| * Copyright (C) Linus Torvalds, 2005 |
| */ |
| |
| #include <time.h> |
| #include <sys/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[] = { |
| "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays" |
| }; |
| |
| /* |
| * 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; |
| } |
| |
| static int date_string(unsigned long date, int offset, char *buf, int len) |
| { |
| int sign = '+'; |
| |
| if (offset < 0) { |
| offset = -offset; |
| sign = '-'; |
| } |
| return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60); |
| } |
| |
| /* 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(const char *date, char *result, int maxlen) |
| { |
| struct tm tm; |
| int offset, 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 -1; |
| |
| if (!tm_gmt) |
| then -= offset * 60; |
| return date_string(then, offset, result, maxlen); |
| } |
| |
| void datestamp(char *buf, int bufsize) |
| { |
| time_t now; |
| int offset; |
| |
| time(&now); |
| |
| offset = my_mktime(localtime(&now)) - now; |
| offset /= 60; |
| |
| date_string(now, offset, buf, bufsize); |
| } |
| |
| static void update_tm(struct tm *tm, unsigned long sec) |
| { |
| time_t n = mktime(tm) - sec; |
| localtime_r(&n, tm); |
| } |
| |
| static void date_yesterday(struct tm *tm, int *num) |
| { |
| update_tm(tm, 24*60*60); |
| } |
| |
| static void date_time(struct tm *tm, int hour) |
| { |
| if (tm->tm_hour < hour) |
| date_yesterday(tm, NULL); |
| tm->tm_hour = hour; |
| tm->tm_min = 0; |
| tm->tm_sec = 0; |
| } |
| |
| static void date_midnight(struct tm *tm, int *num) |
| { |
| date_time(tm, 0); |
| } |
| |
| static void date_noon(struct tm *tm, int *num) |
| { |
| date_time(tm, 12); |
| } |
| |
| static void date_tea(struct tm *tm, int *num) |
| { |
| date_time(tm, 17); |
| } |
| |
| static const struct special { |
| const char *name; |
| void (*fn)(struct tm *, int *); |
| } special[] = { |
| { "yesterday", date_yesterday }, |
| { "noon", date_noon }, |
| { "midnight", date_midnight }, |
| { "tea", date_tea }, |
| { NULL } |
| }; |
| |
| static const char *number_name[] = { |
| "zero", "one", "two", "three", "four", |
| "five", "six", "seven", "eight", "nine", "ten", |
| }; |
| |
| static const struct typelen { |
| const char *type; |
| int length; |
| } typelen[] = { |
| { "seconds", 1 }, |
| { "minutes", 60 }, |
| { "hours", 60*60 }, |
| { "days", 24*60*60 }, |
| { "weeks", 7*24*60*60 }, |
| { NULL } |
| }; |
| |
| static const char *approxidate_alpha(const char *date, struct tm *tm, int *num) |
| { |
| const struct typelen *tl; |
| const struct special *s; |
| const char *end = date; |
| int n = 1, i; |
| |
| while (isalpha(*++end)) |
| n++; |
| |
| for (i = 0; i < 12; i++) { |
| int match = match_string(date, month_names[i]); |
| if (match >= 3) { |
| tm->tm_mon = i; |
| return end; |
| } |
| } |
| |
| for (s = special; s->name; s++) { |
| int len = strlen(s->name); |
| if (match_string(date, s->name) == len) { |
| s->fn(tm, num); |
| return end; |
| } |
| } |
| |
| if (!*num) { |
| for (i = 1; i < 11; i++) { |
| int len = strlen(number_name[i]); |
| if (match_string(date, number_name[i]) == len) { |
| *num = i; |
| return end; |
| } |
| } |
| if (match_string(date, "last") == 4) |
| *num = 1; |
| return end; |
| } |
| |
| tl = typelen; |
| while (tl->type) { |
| int len = strlen(tl->type); |
| if (match_string(date, tl->type) >= len-1) { |
| update_tm(tm, tl->length * *num); |
| *num = 0; |
| return end; |
| } |
| tl++; |
| } |
| |
| for (i = 0; i < 7; i++) { |
| int match = match_string(date, weekday_names[i]); |
| if (match >= 3) { |
| int diff, n = *num -1; |
| *num = 0; |
| |
| diff = tm->tm_wday - i; |
| if (diff <= 0) |
| n++; |
| diff += 7*n; |
| |
| update_tm(tm, diff * 24 * 60 * 60); |
| return end; |
| } |
| } |
| |
| if (match_string(date, "months") >= 5) { |
| int n = tm->tm_mon - *num; |
| *num = 0; |
| while (n < 0) { |
| n += 12; |
| tm->tm_year--; |
| } |
| tm->tm_mon = n; |
| return end; |
| } |
| |
| if (match_string(date, "years") >= 4) { |
| tm->tm_year -= *num; |
| *num = 0; |
| return end; |
| } |
| |
| return end; |
| } |
| |
| unsigned long approxidate(const char *date) |
| { |
| int number = 0; |
| struct tm tm, now; |
| struct timeval tv; |
| char buffer[50]; |
| |
| if (parse_date(date, buffer, sizeof(buffer)) > 0) |
| return strtoul(buffer, NULL, 10); |
| |
| gettimeofday(&tv, NULL); |
| localtime_r(&tv.tv_sec, &tm); |
| now = tm; |
| for (;;) { |
| unsigned char c = *date; |
| if (!c) |
| break; |
| date++; |
| if (isdigit(c)) { |
| char *end; |
| number = strtoul(date-1, &end, 10); |
| date = end; |
| continue; |
| } |
| if (isalpha(c)) |
| date = approxidate_alpha(date-1, &tm, &number); |
| } |
| if (number > 0 && number < 32) |
| tm.tm_mday = number; |
| if (tm.tm_mon > now.tm_mon) |
| tm.tm_year--; |
| return mktime(&tm); |
| } |