lib/libcurses/delwin.c

   1 /*      $NetBSD: delwin.c,v 1.18 2013/10/15 22:15:17 roy Exp $  */
   2
   3 /*
   4  * Copyright (c) 1981, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)delwin.c    8.2 (Berkeley) 5/4/94";
  36 #else
  37 __RCSID("$NetBSD: delwin.c,v 1.18 2013/10/15 22:15:17 roy Exp $");
  38 #endif
  39 #endif                          /* not lint */
  40
  41 #include <stdlib.h>
  42
  43 #include "curses.h"
  44 #include "curses_private.h"
  45
  46 /*
  47  * delwin --
  48  *      Delete a window and release it back to the system.
  49  */
  50 int
  51 delwin(WINDOW *win)
  52 {
  53         WINDOW *wp, *np;
  54         struct __winlist *wl, *pwl;
  55         SCREEN *screen;
  56
  57 #ifdef DEBUG
  58         __CTRACE(__CTRACE_WINDOW, "delwin(%p)\n", win);
  59 #endif
  60
  61         if (win == NULL)
  62                 return (OK);
  63
  64         /*
  65          * Free any storage used by non-spacing characters in the window.
  66          */
  67 #ifdef HAVE_WCHAR
  68         __cursesi_win_free_nsp(win);
  69 #endif
  70
  71         if (win->orig == NULL) {
  72                 /*
  73                  * If we are the original window, delete the space for all
  74                  * the subwindows and the window space.
  75                  */
  76                 free(win->wspace);
  77                 wp = win->nextp;
  78                 while (wp != win) {
  79                         np = wp->nextp;
  80                         delwin(wp);
  81                         wp = np;
  82                 }
  83                 /* Remove ourselves from the list of windows on the screen. */
  84                 pwl = NULL;
  85                 screen = win->screen;
  86                 for (wl = screen->winlistp; wl; pwl = wl, wl = wl->nextp) {
  87                         if (wl->winp != win)
  88                                 continue;
  89                         if (pwl != NULL)
  90                                 pwl->nextp = wl->nextp;
  91                         else
  92                                 screen->winlistp = wl->nextp;
  93                         free(wl);
  94                         break;
  95                 }
  96         } else {
  97                 /*
  98                  * If we are a subwindow, take ourselves out of the list.
  99                  * NOTE: if we are a subwindow, the minimum list is orig
 100                  * followed by this subwindow, so there are always at least
 101                  * two windows in the list.
 102                  */
 103                 for (wp = win->nextp; wp->nextp != win; wp = wp->nextp)
 104                         continue;
 105                 wp->nextp = win->nextp;
 106         }
 107         free(win->lspace);
 108         free(win->alines);
 109         if (win == _cursesi_screen->curscr)
 110                 _cursesi_screen->curscr = NULL;
 111         if (win == _cursesi_screen->stdscr)
 112                 _cursesi_screen->stdscr = NULL;
 113         if (win == _cursesi_screen->__virtscr)
 114                 _cursesi_screen->__virtscr = NULL;
 115         free(win);
 116         return (OK);
 117 }