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 }