non_blank_line(sb, row, col, len) ScrnBuf sb; register int row, col, len;
non_blank_line( ScrnBuf sb, register int row, register int col, register int len)
non_blank_line(sb, row, col, len)ScrnBuf sb;register int row, col, len;{	register int	i;	register Char *ptr = BUF_CHARS(sb, row);	for (i = col; i < len; i++) {		if (ptr[i])			return True;	}	return False;}