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diff --git a/ncurses/base/lib_window.c b/ncurses/base/lib_window.c
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+/****************************************************************************
+ * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
+ * and: Eric S. Raymond <esr@snark.thyrsus.com> *
+ ****************************************************************************/
+
+/*
+** lib_window.c
+**
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_window.c,v 1.24 2008/04/12 22:40:21 tom Exp $")
+
+NCURSES_EXPORT(void)
+_nc_synchook(WINDOW *win)
+/* hook to be called after each window change */
+{
+ if (win->_immed)
+ wrefresh(win);
+ if (win->_sync)
+ wsyncup(win);
+}
+
+NCURSES_EXPORT(int)
+mvderwin(WINDOW *win, int y, int x)
+/* move a derived window */
+{
+ WINDOW *orig;
+ int i;
+
+ T((T_CALLED("mvderwin(%p,%d,%d)"), win, y, x));
+
+ if (win && (orig = win->_parent)) {
+ if (win->_parx == x && win->_pary == y)
+ returnCode(OK);
+ if (x < 0 || y < 0)
+ returnCode(ERR);
+ if ((x + getmaxx(win) > getmaxx(orig)) ||
+ (y + getmaxy(win) > getmaxy(orig)))
+ returnCode(ERR);
+ } else
+ returnCode(ERR);
+ wsyncup(win);
+ win->_parx = x;
+ win->_pary = y;
+ for (i = 0; i < getmaxy(win); i++)
+ win->_line[i].text = &(orig->_line[y++].text[x]);
+ returnCode(OK);
+}
+
+NCURSES_EXPORT(int)
+syncok(WINDOW *win, bool bf)
+/* enable/disable automatic wsyncup() on each change to window */
+{
+ T((T_CALLED("syncok(%p,%d)"), win, bf));
+
+ if (win) {
+ win->_sync = bf;
+ returnCode(OK);
+ } else
+ returnCode(ERR);
+}
+
+NCURSES_EXPORT(void)
+wsyncup(WINDOW *win)
+/* mark changed every cell in win's ancestors that is changed in win */
+/* Rewritten by J. Pfeifer, 1-Apr-96 (don't even think that...) */
+{
+ WINDOW *wp;
+
+ T((T_CALLED("wsyncup(%p)"), win));
+ if (win && win->_parent) {
+ for (wp = win; wp->_parent; wp = wp->_parent) {
+ int y;
+ WINDOW *pp = wp->_parent;
+
+ assert((wp->_pary <= pp->_maxy) &&
+ ((wp->_pary + wp->_maxy) <= pp->_maxy));
+
+ for (y = 0; y <= wp->_maxy; y++) {
+ int left = wp->_line[y].firstchar;
+ if (left >= 0) { /* line is touched */
+ struct ldat *line = &(pp->_line[wp->_pary + y]);
+ /* left & right character in parent window coordinates */
+ int right = wp->_line[y].lastchar + wp->_parx;
+ left += wp->_parx;
+
+ CHANGED_RANGE(line, left, right);
+ }
+ }
+ }
+ }
+ returnVoid;
+}
+
+NCURSES_EXPORT(void)
+wsyncdown(WINDOW *win)
+/* mark changed every cell in win that is changed in any of its ancestors */
+/* Rewritten by J. Pfeifer, 1-Apr-96 (don't even think that...) */
+{
+ T((T_CALLED("wsyncdown(%p)"), win));
+
+ if (win && win->_parent) {
+ WINDOW *pp = win->_parent;
+ int y;
+
+ /* This recursion guarantees, that the changes are propagated down-
+ wards from the root to our direct parent. */
+ wsyncdown(pp);
+
+ /* and now we only have to propagate the changes from our direct
+ parent, if there are any. */
+ assert((win->_pary <= pp->_maxy) &&
+ ((win->_pary + win->_maxy) <= pp->_maxy));
+
+ for (y = 0; y <= win->_maxy; y++) {
+ if (pp->_line[win->_pary + y].firstchar >= 0) { /* parent changed */
+ struct ldat *line = &(win->_line[y]);
+ /* left and right character in child coordinates */
+ int left = pp->_line[win->_pary + y].firstchar - win->_parx;
+ int right = pp->_line[win->_pary + y].lastchar - win->_parx;
+ /* The change may be outside the child's range */
+ if (left < 0)
+ left = 0;
+ if (right > win->_maxx)
+ right = win->_maxx;
+ CHANGED_RANGE(line, left, right);
+ }
+ }
+ }
+ returnVoid;
+}
+
+NCURSES_EXPORT(void)
+wcursyncup(WINDOW *win)
+/* sync the cursor in all derived windows to its value in the base window */
+{
+ WINDOW *wp;
+
+ T((T_CALLED("wcursyncup(%p)"), win));
+ for (wp = win; wp && wp->_parent; wp = wp->_parent) {
+ wmove(wp->_parent, wp->_pary + wp->_cury, wp->_parx + wp->_curx);
+ }
+ returnVoid;
+}
+
+NCURSES_EXPORT(WINDOW *)
+dupwin(WINDOW *win)
+/* make an exact duplicate of the given window */
+{
+ WINDOW *nwin = 0;
+ size_t linesize;
+ int i;
+
+ T((T_CALLED("dupwin(%p)"), win));
+
+ if (win != 0) {
+
+ _nc_lock_window(win);
+ if (win->_flags & _ISPAD) {
+ nwin = newpad(win->_maxy + 1,
+ win->_maxx + 1);
+ } else {
+ nwin = newwin(win->_maxy + 1,
+ win->_maxx + 1,
+ win->_begy,
+ win->_begx);
+ }
+
+ if (nwin != 0) {
+
+ nwin->_curx = win->_curx;
+ nwin->_cury = win->_cury;
+ nwin->_maxy = win->_maxy;
+ nwin->_maxx = win->_maxx;
+ nwin->_begy = win->_begy;
+ nwin->_begx = win->_begx;
+ nwin->_yoffset = win->_yoffset;
+
+ nwin->_flags = win->_flags & ~_SUBWIN;
+ /* Due to the use of newwin(), the clone is not a subwindow.
+ * The text is really copied into the clone.
+ */
+
+ WINDOW_ATTRS(nwin) = WINDOW_ATTRS(win);
+ nwin->_nc_bkgd = win->_nc_bkgd;
+
+ nwin->_notimeout = win->_notimeout;
+ nwin->_clear = win->_clear;
+ nwin->_leaveok = win->_leaveok;
+ nwin->_scroll = win->_scroll;
+ nwin->_idlok = win->_idlok;
+ nwin->_idcok = win->_idcok;
+ nwin->_immed = win->_immed;
+ nwin->_sync = win->_sync;
+ nwin->_use_keypad = win->_use_keypad;
+ nwin->_delay = win->_delay;
+
+ nwin->_parx = 0;
+ nwin->_pary = 0;
+ nwin->_parent = (WINDOW *) 0;
+ /* See above: the clone isn't a subwindow! */
+
+ nwin->_regtop = win->_regtop;
+ nwin->_regbottom = win->_regbottom;
+
+ if (win->_flags & _ISPAD)
+ nwin->_pad = win->_pad;
+
+ linesize = (win->_maxx + 1) * sizeof(NCURSES_CH_T);
+ for (i = 0; i <= nwin->_maxy; i++) {
+ memcpy(nwin->_line[i].text, win->_line[i].text, linesize);
+ nwin->_line[i].firstchar = win->_line[i].firstchar;
+ nwin->_line[i].lastchar = win->_line[i].lastchar;
+ }
+ }
+ _nc_unlock_window(win);
+ }
+ returnWin(nwin);
+}