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#include <time.h>
#include <sys/time.h>
#include <errno.h>
#include <assert.h>
#include <Kernel/Syscall.h>
extern "C" {
time_t time(time_t* tloc)
{
struct timeval tv;
struct timezone tz;
if (gettimeofday(&tv, &tz) < 0)
return (time_t)-1;
if (tloc)
*tloc = tv.tv_sec;
return tv.tv_sec;
}
int gettimeofday(struct timeval* __restrict__ tv, void* __restrict__)
{
int rc = syscall(SC_gettimeofday, tv);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
char* ctime(const time_t*)
{
return const_cast<char*>("ctime() not implemented");
}
static inline bool __is_leap_year(int year)
{
return ((year % 4 == 0) && ((year % 100 != 0) || (year % 400) == 0));
}
static const int __days_per_month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
static const int __seconds_per_day = 60 * 60 * 24;
static void time_to_tm(struct tm* tm, time_t t)
{
int days = t / __seconds_per_day;
int remaining = t % __seconds_per_day;
tm->tm_sec = remaining % 60;
remaining /= 60;
tm->tm_min = remaining % 60;
tm->tm_hour = remaining / 60;
tm->tm_wday = (4 + days) % 7;
int year;
for (year = 1970; days >= 365 + __is_leap_year(year); ++year)
days -= 365 + __is_leap_year(year);
tm->tm_year = year - 1900;
tm->tm_yday = days;
tm->tm_mday = 1;
if (__is_leap_year(year) && days == 59)
++tm->tm_mday;
if (__is_leap_year(year) && days >= 59)
--days;
int month;
for (month = 0; month < 11 && days >= __days_per_month[month]; ++month)
days -= __days_per_month[month];
tm->tm_mon = month;
tm->tm_mday += days;
}
time_t mktime(struct tm* tm)
{
int days = 0;
int seconds = tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
for (int year = 70; year < tm->tm_year; ++year)
days += 365 + __is_leap_year(1900 + year);
tm->tm_yday = tm->tm_mday - 1;
for (int month = 0; month < tm->tm_mon; ++month)
tm->tm_yday += __days_per_month[month];
days += tm->tm_yday;
return days * __seconds_per_day + seconds;
}
struct tm* localtime(const time_t* t)
{
if (!t)
return nullptr;
static struct tm tm_buf;
time_to_tm(&tm_buf, *t);
return &tm_buf;
}
struct tm* gmtime(const time_t* t)
{
// FIXME: This is obviously not correct. What about timezones bro?
return localtime(t);
}
char *asctime(const struct tm*)
{
ASSERT_NOT_REACHED();
}
size_t strftime(char*, size_t, const char*, const struct tm*)
{
ASSERT_NOT_REACHED();
}
long timezone;
long altzone;
char* tzname[2];
int daylight;
void tzset()
{
ASSERT_NOT_REACHED();
}
}
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