int
tmweek(Tm_t* tm, int type, int week, int day)
{
int d;
if (week < 0)
{
if ((day = tm->tm_wday - tm->tm_yday % 7) < 0)
day += 7;
week = (tm->tm_yday + offset[day][type]) / 7;
if (type == 2)
{
if (!week)
week = (day > 0 && day < 6 || tmisleapyear(tm->tm_year - 1)) ? 53 : 52;
else if (week == 53 && (tm->tm_wday + (31 - tm->tm_mday)) < 4)
week = 1;
}
return week;
}
if (day < 0)
day = type != 0;
tm->tm_mon = 0;
tm->tm_mday = 1;
tmfix(tm);
d = tm->tm_wday;
tm->tm_mday = week * 7 - offset[d][type] + ((day || type != 2) ? day : 7);
tmfix(tm);
if (d = tm->tm_wday - day)
{
tm->tm_mday -= d;
tmfix(tm);
}
return tm->tm_yday;
}
int
tmequiv(Tm_t* tm)
{
return tm->tm_year < (2038 - 1900) ? (tm->tm_year + 1900) : equiv[tm->tm_wday + tmisleapyear(tm->tm_year)];
}
Time_t
tmxtime(register Tm_t* tm, int west)
{
register Time_t t;
register Tm_leap_t* lp;
register int32_t y;
int n;
int sec;
time_t now;
struct tm* tl;
Tm_t* to;
Tm_t ts;
ts = *tm;
to = tm;
tm = &ts;
tmset(tm_info.zone);
tmfix(tm);
y = tm->tm_year;
if (y < 69 || y > (TMX_MAXYEAR - 1900))
return TMX_NOTIME;
y--;
t = y * 365 + y / 4 - y / 100 + (y + (1900 - 1600)) / 400 - (1970 - 1901) * 365 - (1970 - 1901) / 4;
if ((n = tm->tm_mon) > 11)
n = 11;
y += 1901;
if (n > 1 && tmisleapyear(y))
t++;
t += tm_data.sum[n] + tm->tm_mday - 1;
t *= 24;
t += tm->tm_hour;
t *= 60;
t += tm->tm_min;
t *= 60;
t += sec = tm->tm_sec;
if (west != TM_UTCZONE && !(tm_info.flags & TM_UTC))
{
/*
* time zone adjustments
*/
if (west == TM_LOCALZONE)
{
t += tm_info.zone->west * 60;
if (!tm_info.zone->daylight)
tm->tm_isdst = 0;
else
{
y = tm->tm_year;
tm->tm_year = tmequiv(tm) - 1900;
now = tmxsec(tmxtime(tm, tm_info.zone->west));
tm->tm_year = y;
if (!(tl = tmlocaltime(&now)))
return TMX_NOTIME;
if (tm->tm_isdst = tl->tm_isdst)
t += tm_info.zone->dst * 60;
}
}
else
{
t += west * 60;
if (!tm_info.zone->daylight)
tm->tm_isdst = 0;
else if (tm->tm_isdst < 0)
{
y = tm->tm_year;
tm->tm_year = tmequiv(tm) - 1900;
tm->tm_isdst = 0;
now = tmxsec(tmxtime(tm, tm_info.zone->west));
tm->tm_year = y;
if (!(tl = tmlocaltime(&now)))
return TMX_NOTIME;
tm->tm_isdst = tl->tm_isdst;
}
}
}
else if (tm->tm_isdst)
tm->tm_isdst = 0;
*to = *tm;
if (tm_info.flags & TM_LEAP)
{
/*
* leap second adjustments
*/
for (lp = &tm_data.leap[0]; t < lp->time - (lp+1)->total; lp++);
t += lp->total;
n = lp->total - (lp+1)->total;
if (t <= (lp->time + n) && (n > 0 && sec > 59 || n < 0 && sec > (59 + n) && sec <= 59))
t -= n;
}
return tmxsns(t, tm->tm_nsec);
}
