ncurses 6.3 - patch 20211106
[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 1.22 2021/11/06 21:54:14 tom Exp $")
47
48 static bool
49 cannot_delete(WINDOW *win)
50 {
51     WINDOWLIST *p;
52     bool result = TRUE;
53     if (IS_PAD(win)) {
54         result = FALSE;
55     } else {
56 #ifdef USE_SP_WINDOWLIST
57         SCREEN *sp = _nc_screen_of(win);
58 #endif
59
60         for (each_window(SP_PARM, p)) {
61             if (&(p->win) == win) {
62                 result = FALSE;
63             } else if (IS_SUBWIN(&(p->win))
64                        && p->win._parent == win) {
65                 result = TRUE;
66                 break;
67             }
68         }
69     }
70     return result;
71 }
72
73 NCURSES_EXPORT(int)
74 delwin(WINDOW *win)
75 {
76     int result = ERR;
77
78     T((T_CALLED("delwin(%p)"), (void *) win));
79
80     if (_nc_try_global(curses) == 0) {
81         if (win == 0
82             || cannot_delete(win)) {
83             result = ERR;
84         } else if (IS_PAD(win)) {
85             win->_parent = NULL;
86             result = OK;
87         } else {
88 #if NCURSES_SP_FUNCS
89             SCREEN *sp = _nc_screen_of(win);
90 #endif
91             if (IS_SUBWIN(win)) {
92                 touchwin(win->_parent);
93             } else if (CurScreen(SP_PARM) != 0) {
94                 touchwin(CurScreen(SP_PARM));
95             }
96             result = _nc_freewin(win);
97         }
98         _nc_unlock_global(curses);
99     }
100     returnCode(result);
101 }