58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
#include <euler/syscall.hpp>
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#include <ctime>
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time_t time(time_t *arg) {
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time_t t = euler::syscall::get_time();
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if (arg) *arg = t;
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return t;
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}
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static tm static_tm;
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static int days_per_month[] = {
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31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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tm *gmtime(const time_t *time) {
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time_t t = *time / 1024;
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static_tm.tm_isdst = 0;
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static_tm.tm_sec = t % 60; t /= 60;
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static_tm.tm_min = t % 60; t /= 60;
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static_tm.tm_hour = t % 24; t /= 24;
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static_tm.tm_wday = (t + 5) % 7 + 1;
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static_tm.tm_year = (t / 1461) * 4 + 100;
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int days_into_quadyear = t % 1461;
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static_tm.tm_yday = 0;
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static_tm.tm_mon = 0;
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static_tm.tm_mday = 1;
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for (int i = 0; i < 48; ++i) {
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if (days_into_quadyear >= days_per_month[i]) {
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days_into_quadyear -= days_per_month[i];
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if (static_tm.tm_mon == 11) {
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static_tm.tm_mon = 0;
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static_tm.tm_yday = 0;
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}
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else {
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++static_tm.tm_mon;
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static_tm.tm_yday += days_per_month[i];
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}
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}
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else {
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static_tm.tm_yday += days_into_quadyear;
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static_tm.tm_mday += days_into_quadyear;
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break;
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}
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}
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return &static_tm;
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}
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