MTF_HITBOF
if ((sc->sc_flags & MTF_HITBOF) != 0)
sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
sc->sc_flags |= MTF_HITBOF;
if (sc->sc_flags & MTF_HITBOF)
sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
sc->sc_flags |= MTF_HITBOF;