/*
 * 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*/

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

/*
 * Make a number of lines look like they have/have not been changed.
 * y: the start line
 * n: the number of lines affected
 * changed:     1: changed
 *              0: not changed
 *              -1: changed. Called internally - In this mode
 *              even REDRAW lines are changed.
 */

int
wtouchln(WINDOW *win, int y, int n, int changed)
{
        short   *firstch, *lastch, b, e;
        int     maxy = win->_maxy;

        if (y >= maxy)
                return (ERR);
        if (y < 0)
                y = 0;
        if ((y + n) > maxy)
                n = maxy - y;
        firstch = win->_firstch + y;
        lastch = win->_lastch + y;
        if (changed) {
                win->_flags |= _WINCHANGED;
                b = 0;
                e = win->_maxx - 1;
        } else {
                b = _INFINITY;
                e = -1;
                win->_flags &= ~_WINCHANGED;
        }

        for (; n-- > 0; firstch++, lastch++) {
                if (changed == -1 || *firstch != _REDRAW)
                        *firstch = b, *lastch = e;
        }

        if ((changed == 1) && win->_sync)
                wsyncup(win);

        return (((changed == 1) && win->_immed) ? wrefresh(win) : OK);
}