/*
 * 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 the changes in ancestors visible in win. */

void
wsyncdown(WINDOW *win)
{
        short   *wbch, *wech, *pbch, *pech, bch, ech, endx;
        int     wy, px, py, endy;
        WINDOW  *par;

        py = win->_pary;
        px = win->_parx;
        endy = win->_maxy;
        endx = win->_maxx - 1;

        for (par = win->_parent; par != NULL; par = par->_parent) {
                if (par->_flags & (_WINCHANGED | _WIN_ADD_ONE |
                    _WIN_INS_ONE)) {
                        wbch = win->_firstch;
                        wech = win->_lastch;
                        pbch = par->_firstch + py;
                        pech = par->_lastch + py;

                        for (wy = 0; wy < endy; ++wy, ++wbch, ++wech,
                            ++pbch, ++pech) {
                                if (*pbch != _INFINITY) {
                                        if ((bch = *pbch - px) < 0)
                                                bch = 0;
                                        if ((ech = *pech - px) > endx)
                                                ech = endx;
                                        if (!(bch > endx || ech < 0)) {
                                                if (*wbch > bch)
                                                        *wbch = bch;
                                                if (*wech < ech)
                                                        *wech = ech;
                                        }
                                }
                        }
                        win->_flags |= _WINCHANGED;
                }

                py += par->_pary;
                px += par->_parx;
        }
}