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#include "time_impl.h"
#include <errno.h>
time_t mktime(struct tm *tm)
{
struct tm new;
long opp;
long long t = __tm_to_secs(tm);
__secs_to_zone(t, 1, &new.tm_isdst, &new.__tm_gmtoff, &opp, &new.__tm_zone);
if (tm->tm_isdst>=0 && new.tm_isdst!=tm->tm_isdst)
t -= opp - new.__tm_gmtoff;
t -= new.__tm_gmtoff;
if ((time_t)t != t) goto error;
__secs_to_zone(t, 0, &new.tm_isdst, &new.__tm_gmtoff, &opp, &new.__tm_zone);
if (__secs_to_tm(t + new.__tm_gmtoff, &new) < 0) goto error;
*tm = new;
return t;
error:
errno = EOVERFLOW;
return -1;
}
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