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  *
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   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  *
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  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    *
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  22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
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  24  * Except as contained in this notice, the name(s) of the above copyright   *
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  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 }