xref: /freebsd/contrib/ncurses/panel/p_new.c (revision ae83180158c4c937f170e31eff311b18c0286a93)
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2  * Copyright (c) 1998,2000 Free Software Foundation, Inc.                   *
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14  *                                                                          *
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28 
29 /****************************************************************************
30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1995                    *
31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32  ****************************************************************************/
33 
34 /* p_new.c
35  * Creation of a new panel
36  */
37 #include "panel.priv.h"
38 
39 MODULE_ID("$Id: p_new.c,v 1.6 2000/12/10 02:20:44 tom Exp $")
40 
41 #ifdef TRACE
42 static char* stdscr_id;
43 static char* new_id;
44 #endif
45 
46 /*+-------------------------------------------------------------------------
47   Get root (i.e. stdscr's) panel.
48   Establish the pseudo panel for stdscr if necessary.
49 --------------------------------------------------------------------------*/
50 static PANEL*
51 root_panel(void)
52 {
53   if(_nc_stdscr_pseudo_panel == (PANEL*)0)
54     {
55 
56       assert(stdscr && !_nc_bottom_panel && !_nc_top_panel);
57       _nc_stdscr_pseudo_panel = (PANEL*)malloc(sizeof(PANEL));
58       if (_nc_stdscr_pseudo_panel != 0) {
59 	PANEL* pan  = _nc_stdscr_pseudo_panel;
60 	WINDOW* win = stdscr;
61 	pan->win = win;
62 	pan->below   = (PANEL*)0;
63 	pan->above   = (PANEL*)0;
64 #ifdef TRACE
65 	if (!stdscr_id)
66 	  stdscr_id = strdup("stdscr");
67 	pan->user = stdscr_id;
68 #else
69 	pan->user = (void*)0;
70 #endif
71 	_nc_bottom_panel = _nc_top_panel = pan;
72       }
73     }
74   return _nc_stdscr_pseudo_panel;
75 }
76 
77 NCURSES_EXPORT(PANEL *)
78 new_panel (WINDOW *win)
79 {
80   PANEL *pan = (PANEL*)0;
81 
82   if (!win)
83     return(pan);
84 
85   if (!_nc_stdscr_pseudo_panel)
86     (void)root_panel();
87   assert(_nc_stdscr_pseudo_panel);
88 
89   if (!(win->_flags & _ISPAD) && (pan = (PANEL*)malloc(sizeof(PANEL))))
90     {
91       pan->win = win;
92       pan->above = (PANEL *)0;
93       pan->below = (PANEL *)0;
94 #ifdef TRACE
95       if (!new_id)
96 	new_id = strdup("new");
97       pan->user = new_id;
98 #else
99       pan->user = (char *)0;
100 #endif
101       (void)show_panel(pan);
102     }
103   return(pan);
104 }
105