portside
if (portside(from, on, 0)) {
Write(portside(from, on, 0) ? W_GUNR : W_GUNL,
temp = portside(closest, sp, 1)
if ((ran = portside(ship, to, 1) - fp->dir) == 4 || ran == -4)
int portside(struct ship *, struct ship *, int);
temp = portside(closest, ms, 1) - closest->file->dir + 1;
i = portside(ms, ship, 1) - mf->dir;