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


/*
 *      Copyright (c) 1997, by Sun Microsystems, Inc.
 *      All rights reserved.
 */

/* A panels subsystem built on curses--Move a panel to the top */

/*LINTLIBRARY*/

#include <sys/types.h>
#include <curses.h>
#include "private.h"

/*  top_panel    */
int
top_panel(PANEL *panel)
{
        _obscured_list  *obs;
        _obscured_list  *prev_obs, *tmp;

        if (!panel || panel == panel -> below)
                return (ERR);

        /* If the panel is already on top, there is nothing to do */

        if (_Top_panel == panel)
                return (OK);

        /*
         * All the panels that used to obscure this panel are
         * now obscured by this panel.
         */

        if ((obs = panel -> obscured) != 0) {
                do {
                        prev_obs = obs;
                        obs = obs -> next;
                        if ((tmp = prev_obs -> panel_p -> obscured) != 0) {
                                prev_obs->next = tmp->next;
                                tmp->next = prev_obs;
                        } else
                                prev_obs->next =
                                    prev_obs->panel_p->obscured = prev_obs;
                        prev_obs -> panel_p = panel;
                }
                while (obs != panel -> obscured);
                panel -> obscured = 0;
        }

        /* Move the panel to the top */

        if (panel == _Bottom_panel)
                (_Bottom_panel = panel -> above) -> below = 0;
        else {
                panel -> above -> below = panel -> below;
                panel -> below -> above = panel -> above;
        }

        panel -> above = 0;
        panel -> below = _Top_panel;
        _Top_panel = _Top_panel -> above = panel;
        (void) touchwin(panel -> win);

        return (OK);
}