source: asp3_tinet_ecnl_arm/trunk/musl-1.1.18/src/time/mktime.c@ 352

#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;
}