/*      $NetBSD: del.c,v 1.3 2015/11/02 02:45:25 kamil Exp $ */

/*
* Copyright (c) 2015 Valery Ushakov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: del.c,v 1.3 2015/11/02 02:45:25 kamil Exp $");

#include "panel_impl.h"

#include <assert.h>
#include <stdlib.h>


int
del_panel(PANEL *p)
{

       if (__predict_false(p == NULL))
               return ERR;

       (void) hide_panel(p);
       free(p);

       /*
        * If the last panel is removed, remove the phantom stdscr
        * panel as well.
        *
        * A program that wants to switch to a different screen with
        * set_term(3), or ends and recreates curses session with
        * endwin(3)/initscr(3), must delete all panels first, since
        * their windows will become invalid.  When it will create its
        * first new panel afterwards, it will pick up new stdscr.
        */
       if (TAILQ_LAST(&_deck, deck) == &_stdscr_panel) {
               (void) hide_panel(&_stdscr_panel);
               assert(TAILQ_EMPTY(&_deck));
       }

       return OK;
}