void cavan_time_parse(unsigned long timestamp, struct cavan_time *time, u32 base_days)
{
u32 year;
u32 remain;
unsigned long days;
const u16 *p, *yday;
days = timestamp / CAVAN_TIME_SECONDS_PER_DAY + base_days;
time->wday = days % 7;
year = days / 366;
while (cavan_time_get_days_of_year(year + 1, 0, 1) <= days)
{
year++;
}
yday = cavan_time_mon_yday[cavan_time_year_is_leap(year)];
days -= cavan_time_get_days_of_year(year, 0, 1);
for (p = yday + 11; *p > days; p--);
time->year = year;
time->month = p - yday;
time->mday = days - *p + 1;
time->yday = days;
remain = timestamp % CAVAN_TIME_SECONDS_PER_DAY;
time->hour = remain / CAVAN_TIME_SECONDS_PER_HOUR;
time->minute = remain % CAVAN_TIME_SECONDS_PER_HOUR / CAVAN_TIME_SECONDS_PER_MIN;
time->second = timestamp % CAVAN_TIME_SECONDS_PER_MIN;
}
u32 cavan_time_get_days_of_year(u32 year, u8 month, u8 day)
{
u32 days = year * 365 + day;
const u16 *yday = cavan_time_mon_yday[cavan_time_year_is_leap(year)];
if (year > 0) {
year--;
}
return year / 4 - year / 100 + year / 400 + yday[month] + days - 1;
}
