ERASECOLS
ERASECOLS(edp->ccol, COLS_LEFT + 1, edp->bkgdattr));
ERASECOLS(0, edp->ccol + 1, edp->bkgdattr));
ERASECOLS(edp->ccol, COLS_LEFT + 1, edp->bkgdattr));
ERASECOLS(0, edp->ccol + 1, edp->bkgdattr));
ERASECOLS(edp->ccol, n, edp->bkgdattr));
ERASECOLS(NCOLS - n, n, edp->bkgdattr));
ERASECOLS(edp->ccol, n, edp->bkgdattr));