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@@ -27,39 +27,53 @@ char* ctime(const time_t*)
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return const_cast<char*>("ctime() not implemented");
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}
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-inline bool is_leap_year(unsigned year)
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+static inline bool __is_leap_year(int year)
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{
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return ((year % 4 == 0) && ((year % 100 != 0) || (year % 400) == 0));
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}
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+static const int __days_per_month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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+static const int __seconds_per_day = 60 * 60 * 24;
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+
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static void time_to_tm(struct tm* tm, time_t t)
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{
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- static const unsigned seconds_per_day = 60 * 60 * 24;
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- static const unsigned days_per_month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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- unsigned days = t / seconds_per_day;
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- unsigned rem = t % seconds_per_day;
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- tm->tm_sec = rem % 60;
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- rem /= 60;
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- tm->tm_min = rem % 60;
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- tm->tm_hour = rem / 60;
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+ int days = t / __seconds_per_day;
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+ int remaining = t % __seconds_per_day;
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+ tm->tm_sec = remaining % 60;
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+ remaining /= 60;
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+ tm->tm_min = remaining % 60;
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+ tm->tm_hour = remaining / 60;
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tm->tm_wday = (4 + days) % 7;
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- unsigned year;
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- for (year = 1970; days >= 365 + is_leap_year(year); ++year)
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- days -= 365 + is_leap_year(year);
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+ int year;
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+ for (year = 1970; days >= 365 + __is_leap_year(year); ++year)
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+ days -= 365 + __is_leap_year(year);
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tm->tm_year = year - 1900;
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tm->tm_yday = days;
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tm->tm_mday = 1;
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- if (is_leap_year(year) && days == 59)
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+ if (__is_leap_year(year) && days == 59)
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++tm->tm_mday;
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- if (is_leap_year(year) && days >= 59)
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+ if (__is_leap_year(year) && days >= 59)
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--days;
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- unsigned month;
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- for (month = 0; month < 11 && days >= days_per_month[month]; ++month)
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- days -= days_per_month[month];
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+ int month;
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+ for (month = 0; month < 11 && days >= __days_per_month[month]; ++month)
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+ days -= __days_per_month[month];
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tm->tm_mon = month;
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tm->tm_mday += days;
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}
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+time_t mktime(struct tm* tm)
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+{
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+ int days = 0;
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+ int seconds = tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
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+ for (int year = 70; year < tm->tm_year; ++year)
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+ days += 365 + __is_leap_year(1900 + year);
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+ tm->tm_yday = tm->tm_mday - 1;
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+ for (int month = 0; month < tm->tm_mon; ++month)
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+ tm->tm_yday += __days_per_month[month];
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+ days += tm->tm_yday;
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+ return days * __seconds_per_day + seconds;
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+}
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+
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struct tm* localtime(const time_t* t)
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{
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if (!t)
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