BORDER
sp->s_occ = BORDER; /* left & right border */
sp->s_occ = BORDER; /* bottom border */
if (sp2->s_occ == BORDER)
sp->s_occ = BORDER; /* top border */
if (sp1->s_occ == BORDER)
if (sp2->s_occ == BORDER)
if (sp->s_occ == BORDER)
if (fsp->s_occ == BORDER)
if (fsp->s_occ == BORDER)