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diff --git a/ncurses-5.9/ncurses/base/lib_refresh.c b/ncurses-5.9/ncurses/base/lib_refresh.c
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+/****************************************************************************
+ * Copyright (c) 1998-2009,2010 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> *
+ * and: Thomas E. Dickey 1996-on *
+ * and: Juergen Pfeifer *
+ ****************************************************************************/
+
+/*
+ * lib_refresh.c
+ *
+ * The routines wrefresh() and wnoutrefresh().
+ *
+ */
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id$")
+
+NCURSES_EXPORT(int)
+wrefresh(WINDOW *win)
+{
+ int code;
+#if NCURSES_SP_FUNCS
+ SCREEN *SP_PARM = _nc_screen_of(win);
+#endif
+
+ T((T_CALLED("wrefresh(%p)"), (void *) win));
+
+ if (win == 0) {
+ code = ERR;
+ } else if (win == CurScreen(SP_PARM)) {
+ CurScreen(SP_PARM)->_clear = TRUE;
+ code = NCURSES_SP_NAME(doupdate) (NCURSES_SP_ARG);
+ } else if ((code = wnoutrefresh(win)) == OK) {
+ if (win->_clear)
+ NewScreen(SP_PARM)->_clear = TRUE;
+ code = NCURSES_SP_NAME(doupdate) (NCURSES_SP_ARG);
+ /*
+ * Reset the clearok() flag in case it was set for the special
+ * case in hardscroll.c (if we don't reset it here, we'll get 2
+ * refreshes because the flag is copied from stdscr to newscr).
+ * Resetting the flag shouldn't do any harm, anyway.
+ */
+ win->_clear = FALSE;
+ }
+ returnCode(code);
+}
+
+NCURSES_EXPORT(int)
+wnoutrefresh(WINDOW *win)
+{
+ int limit_x;
+ int src_row, src_col;
+ int begx;
+ int begy;
+ int dst_row, dst_col;
+#if USE_SCROLL_HINTS
+ bool wide;
+#endif
+#if NCURSES_SP_FUNCS
+ SCREEN *SP_PARM = _nc_screen_of(win);
+#endif
+
+ T((T_CALLED("wnoutrefresh(%p)"), (void *) win));
+#ifdef TRACE
+ if (USE_TRACEF(TRACE_UPDATE)) {
+ _tracedump("...win", win);
+ _nc_unlock_global(tracef);
+ }
+#endif /* TRACE */
+
+ /*
+ * This function will break badly if we try to refresh a pad.
+ */
+ if ((win == 0)
+ || (win->_flags & _ISPAD))
+ returnCode(ERR);
+
+ /* put them here so "win == 0" won't break our code */
+ begx = win->_begx;
+ begy = win->_begy;
+
+ NewScreen(SP_PARM)->_nc_bkgd = win->_nc_bkgd;
+ WINDOW_ATTRS(NewScreen(SP_PARM)) = WINDOW_ATTRS(win);
+
+ /* merge in change information from all subwindows of this window */
+ wsyncdown(win);
+
+#if USE_SCROLL_HINTS
+ /*
+ * For pure efficiency, we'd want to transfer scrolling information
+ * from the window to newscr whenever the window is wide enough that
+ * its update will dominate the cost of the update for the horizontal
+ * band of newscr that it occupies. Unfortunately, this threshold
+ * tends to be complex to estimate, and in any case scrolling the
+ * whole band and rewriting the parts outside win's image would look
+ * really ugly. So. What we do is consider the window "wide" if it
+ * either (a) occupies the whole width of newscr, or (b) occupies
+ * all but at most one column on either vertical edge of the screen
+ * (this caters to fussy people who put boxes around full-screen
+ * windows). Note that changing this formula will not break any code,
+ * merely change the costs of various update cases.
+ */
+ wide = (begx <= 1 && win->_maxx >= (NewScreen(SP_PARM)->_maxx - 1));
+#endif
+
+ win->_flags &= ~_HASMOVED;
+
+ /*
+ * Microtweaking alert! This double loop is one of the genuine
+ * hot spots in the code. Even gcc doesn't seem to do enough
+ * common-subexpression chunking to make it really tense,
+ * so we'll force the issue.
+ */
+
+ /* limit(dst_col) */
+ limit_x = win->_maxx;
+ /* limit(src_col) */
+ if (limit_x > NewScreen(SP_PARM)->_maxx - begx)
+ limit_x = NewScreen(SP_PARM)->_maxx - begx;
+
+ for (src_row = 0, dst_row = begy + win->_yoffset;
+ src_row <= win->_maxy && dst_row <= NewScreen(SP_PARM)->_maxy;
+ src_row++, dst_row++) {
+ struct ldat *nline = &(NewScreen(SP_PARM)->_line[dst_row]);
+ struct ldat *oline = &win->_line[src_row];
+
+ if (oline->firstchar != _NOCHANGE) {
+ int last_src = oline->lastchar;
+
+ if (last_src > limit_x)
+ last_src = limit_x;
+
+ src_col = oline->firstchar;
+ dst_col = src_col + begx;
+
+ if_WIDEC({
+ int j;
+
+ /*
+ * Ensure that we will copy complete multi-column characters
+ * on the left-boundary.
+ */
+ if (isWidecExt(oline->text[src_col])) {
+ j = 1 + dst_col - WidecExt(oline->text[src_col]);
+ if (j < 0)
+ j = 0;
+ if (dst_col > j) {
+ src_col -= (dst_col - j);
+ dst_col = j;
+ }
+ }
+
+ /*
+ * Ensure that we will copy complete multi-column characters
+ * on the right-boundary.
+ */
+ j = last_src;
+ if (WidecExt(oline->text[j])) {
+ ++j;
+ while (j <= limit_x) {
+ if (isWidecBase(oline->text[j])) {
+ break;
+ } else {
+ last_src = j;
+ }
+ ++j;
+ }
+ }
+ });
+
+ if_WIDEC({
+ static cchar_t blank = BLANK;
+ int last_dst = begx + ((last_src < win->_maxx)
+ ? last_src
+ : win->_maxx);
+ int fix_left = dst_col;
+ int fix_right = last_dst;
+ int j;
+
+ /*
+ * Check for boundary cases where we may overwrite part of a
+ * multi-column character. For those, wipe the remainder of
+ * the character to blanks.
+ */
+ j = dst_col;
+ if (isWidecExt(nline->text[j])) {
+ /*
+ * On the left, we only care about multi-column characters
+ * that extend into the changed region.
+ */
+ fix_left = 1 + j - WidecExt(nline->text[j]);
+ if (fix_left < 0)
+ fix_left = 0; /* only if cell is corrupt */
+ }
+
+ j = last_dst;
+ if (WidecExt(nline->text[j]) != 0) {
+ /*
+ * On the right, any multi-column character is a problem,
+ * unless it happens to be contained in the change, and
+ * ending at the right boundary of the change. The
+ * computation for 'fix_left' accounts for the left-side of
+ * this character. Find the end of the character.
+ */
+ ++j;
+ while (j <= NewScreen(SP_PARM)->_maxx &&
+ isWidecExt(nline->text[j])) {
+ fix_right = j++;
+ }
+ }
+
+ /*
+ * The analysis is simpler if we do the clearing afterwards.
+ * Do that now.
+ */
+ if (fix_left < dst_col || fix_right > last_dst) {
+ for (j = fix_left; j <= fix_right; ++j) {
+ nline->text[j] = blank;
+ CHANGED_CELL(nline, j);
+ }
+ }
+ });
+
+ /*
+ * Copy the changed text.
+ */
+ for (; src_col <= last_src; src_col++, dst_col++) {
+ if (!CharEq(oline->text[src_col], nline->text[dst_col])) {
+ nline->text[dst_col] = oline->text[src_col];
+ CHANGED_CELL(nline, dst_col);
+ }
+ }
+
+ }
+#if USE_SCROLL_HINTS
+ if (wide) {
+ int oind = oline->oldindex;
+
+ nline->oldindex = ((oind == _NEWINDEX)
+ ? _NEWINDEX
+ : (begy + oind + win->_yoffset));
+ }
+#endif /* USE_SCROLL_HINTS */
+
+ oline->firstchar = oline->lastchar = _NOCHANGE;
+ if_USE_SCROLL_HINTS(oline->oldindex = src_row);
+ }
+
+ if (win->_clear) {
+ win->_clear = FALSE;
+ NewScreen(SP_PARM)->_clear = TRUE;
+ }
+
+ if (!win->_leaveok) {
+ NewScreen(SP_PARM)->_cury = (NCURSES_SIZE_T) (win->_cury +
+ win->_begy + win->_yoffset);
+ NewScreen(SP_PARM)->_curx = (NCURSES_SIZE_T) (win->_curx + win->_begx);
+ }
+ NewScreen(SP_PARM)->_leaveok = win->_leaveok;
+
+#ifdef TRACE
+ if (USE_TRACEF(TRACE_UPDATE)) {
+ _tracedump("newscr", NewScreen(SP_PARM));
+ _nc_unlock_global(tracef);
+ }
+#endif /* TRACE */
+ returnCode(OK);
+}
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