ncurses 6.3 - patch 20220514
[ncurses.git] / ncurses / base / lib_delwin.c
1 /****************************************************************************
2  * Copyright 2020,2021 Thomas E. Dickey                                     *
3  * Copyright 1998-2008,2009 Free Software Foundation, Inc.                  *
4  *                                                                          *
5  * Permission is hereby granted, free of charge, to any person obtaining a  *
6  * copy of this software and associated documentation files (the            *
7  * "Software"), to deal in the Software without restriction, including      *
8  * without limitation the rights to use, copy, modify, merge, publish,      *
9  * distribute, distribute with modifications, sublicense, and/or sell       *
10  * copies of the Software, and to permit persons to whom the Software is    *
11  * furnished to do so, subject to the following conditions:                 *
12  *                                                                          *
13  * The above copyright notice and this permission notice shall be included  *
14  * in all copies or substantial portions of the Software.                   *
15  *                                                                          *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
19  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
23  *                                                                          *
24  * Except as contained in this notice, the name(s) of the above copyright   *
25  * holders shall not be used in advertising or otherwise to promote the     *
26  * sale, use or other dealings in this Software without prior written       *
27  * authorization.                                                           *
28  ****************************************************************************/
29
30 /****************************************************************************
31  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
32  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
33  *     and: Thomas E. Dickey                        1996-on                 *
34  *     and: Juergen Pfeifer                         2008                    *
35  ****************************************************************************/
36
37 /*
38 **      lib_delwin.c
39 **
40 **      The routine delwin().
41 **
42 */
43
44 #include <curses.priv.h>
45
46 MODULE_ID("$Id: lib_delwin.c,v 1.24 2021/12/11 23:56:25 tom Exp $")
47
48 static bool
49 cannot_delete(WINDOW *win)
50 {
51     bool result = TRUE;
52
53     if (IS_PAD(win)) {
54         result = FALSE;
55     } else {
56         WINDOWLIST *p;
57 #ifdef USE_SP_WINDOWLIST
58         SCREEN *sp = _nc_screen_of(win);
59 #endif
60
61         for (each_window(SP_PARM, p)) {
62             if (&(p->win) == win) {
63                 result = FALSE;
64             } else if (IS_SUBWIN(&(p->win))
65                        && p->win._parent == win) {
66                 result = TRUE;
67                 break;
68             }
69         }
70     }
71     return result;
72 }
73
74 NCURSES_EXPORT(int)
75 delwin(WINDOW *win)
76 {
77     int result = ERR;
78
79     T((T_CALLED("delwin(%p)"), (void *) win));
80
81     if (_nc_try_global(curses) == 0) {
82         if (win == 0
83             || cannot_delete(win)) {
84             result = ERR;
85         } else if (IS_PAD(win)) {
86             win->_parent = NULL;
87             result = _nc_freewin(win);
88         } else {
89 #if NCURSES_SP_FUNCS
90             SCREEN *sp = _nc_screen_of(win);
91 #endif
92             if (IS_SUBWIN(win)) {
93                 touchwin(win->_parent);
94             } else if (CurScreen(SP_PARM) != 0) {
95                 touchwin(CurScreen(SP_PARM));
96             }
97             result = _nc_freewin(win);
98         }
99         _nc_unlock_global(curses);
100     }
101     returnCode(result);
102 }