xref: /illumos-gate/usr/src/lib/libcurses/screen/wredrawln.c (revision 1da57d55)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1988 AT&T	*/
/*	  All Rights Reserved	*/

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

/*LINTLIBRARY*/

/*
 * This routine indicates to curses that a screen line is garbaged and
 * should be thrown away before having anything written over the top of it.
 * It could be used for programs such as editors which want a command to
 * redraw just a single line. Such a command could be used in cases where
 * there is a noisy line and redrawing the entire screen would be subject
 * to even more noise. Just redrawing the single line gives some semblance
 * of hope that it would show up unblemished.
 *
 * This is a more refined version of clearok
 */

#include	<sys/types.h>
#include	"curses_inc.h"

int
wredrawln(WINDOW *win, int begline, int numlines)
{
	short	*firstch, *efirstch;

	if (numlines <= 0)
		return (ERR);
	if (begline < 0)
		begline = 0;
	if (begline + numlines > win->_maxy)
		numlines = win->_maxy - begline;

	firstch = win->_firstch + begline;
	efirstch = firstch + numlines;
	while (firstch < efirstch)
		*firstch++ = _REDRAW;

	return (win->_immed ? wrefresh(win) : OK);
}