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#include <time.h>
#include "_safety.h"
#include "_time.h"
/** convert arithmetic time to broken down time **/
struct tm * gmtime(const time_t * timer)
{
static struct tm tm = {0};
time_t seconds = 0;
int days = 0;
SIGNAL_SAFE(0);
ASSERT_NONNULL(timer);
seconds = *timer;
tm.tm_year = EPOCH_YEAR;
while (seconds > SEC_PER_YEAR) {
/* TODO: Will this mess up Dec 31 of leap year? */
/* TODO: Or Jan 1 of year after leap year? */
seconds -= SEC_PER_YEAR;
if (ISLEAPYEAR(tm.tm_year + 1900)) {
seconds -= SEC_PER_DAY;
}
tm.tm_year++;
}
tm.tm_yday = (int)(seconds / SEC_PER_DAY);
seconds = seconds % SEC_PER_DAY;
tm.tm_hour = (int)(seconds / SEC_PER_HR);
seconds = seconds % SEC_PER_HR;
tm.tm_min = (int)(seconds / SEC_PER_MIN);
tm.tm_sec = (int)(seconds % SEC_PER_MIN);
days = tm.tm_yday;
tm.tm_mon = 0;
while (days > DAYS_IN(tm.tm_year, tm.tm_mon)) {
days -= DAYS_IN(tm.tm_year, tm.tm_mon);
tm.tm_mon++;
}
tm.tm_mday = days;
/* TODO: tm_wday */
tm.tm_wday = 0;
/* TODO: tm_isdst */
tm.tm_isdst = 0;
return &tm;
}
CHECK_1(struct tm *, 0, gmtime, const time_t *)
/***
converts the UTC time at ARGUMENT(timer) to a filled out STRUCTDEF(tm).
***/
/*
RETURN_FAILURE(CONSTANT(NULL))
RETURN_SUCCESS(a pointer to the converted time)
STDC(1)
*/
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