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del.c revision 1.1 
      1 /*	$NetBSD: del.c,v 1.1 2015/10/26 23:09:49 uwe Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2015 Valery Ushakov
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __RCSID("$NetBSD: del.c,v 1.1 2015/10/26 23:09:49 uwe Exp $");
     30 
     31 #include "panel_impl.h"
     32 
     33 #include <assert.h>
     34 #include <stdlib.h>
     35 
     36 
     37 int
     38 del_panel(PANEL *p)
     39 {
     40 
     41 	if (__predict_false(p == NULL))
     42 		return ERR;
     43 
     44 	(void) hide_panel(p);
     45 	free(p);
     46 
     47 	/*
     48 	 * If the last panel is removed, remove the phantom stdscr
     49 	 * panel as well.
     50 	 *
     51 	 * A program that wants to switch to a different screen with
     52 	 * set_term(3), or ends and recreates curses session with
     53 	 * endwin(3)/initscr(3), must delete all panels first, since
     54 	 * their windows will become invalid.  When it will create its
     55 	 * first new panel afterwards, it will pick up new stdscr.
     56 	 */
     57 	if (TAILQ_LAST(&_deck, deck) == &_stdscr_panel) {
     58 		(void) hide_panel(&_stdscr_panel);
     59 		assert(TAILQ_EMPTY(&_deck));
     60 	}
     61 
     62 	return OK;
     63 }
     64