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      1 /*	$NetBSD: new.c,v 1.3 2015/11/02 02:45:25 kamil 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: new.c,v 1.3 2015/11/02 02:45:25 kamil Exp $");
     30 
     31 #include "panel_impl.h"
     32 
     33 #include <assert.h>
     34 #include <stdlib.h>
     35 
     36 
     37 static PANEL *
     38 _new_panel(WINDOW *w)
     39 {
     40 	PANEL *p;
     41 
     42 	p = (PANEL *)malloc(sizeof(PANEL));
     43 	if (__predict_false(p == NULL))
     44 		return NULL;
     45 
     46 	p->win = w;
     47 	p->user = NULL;
     48 
     49 	DECK_INSERT_TOP(p);
     50 	return p;
     51 }
     52 
     53 
     54 PANEL *
     55 new_panel(WINDOW *w)
     56 {
     57 
     58 	if (__predict_false(w == NULL))
     59 		return NULL;
     60 
     61 	if (__predict_false(w == stdscr))
     62 		return NULL;
     63 
     64 	/*
     65 	 * Ensure there's phantom panel for stdscr at (below) the
     66 	 * bottom.  We explicitly re-assign stdscr in case it changed.
     67 	 */
     68 	if (TAILQ_EMPTY(&_deck)) {
     69 		assert(PANEL_HIDDEN(&_stdscr_panel));
     70 
     71 		_stdscr_panel.win = stdscr;
     72 		DECK_INSERT_TOP(&_stdscr_panel);
     73 	}
     74 
     75 	return _new_panel(w);
     76 }
     77