Add wnoutrefresh() and doupdate().

lib/libcurses/PSD.doc/fns.doc

@@ -341,6 +341,12 @@ is relative to the origin of the parent window
 instead of being absolute screen coordinates as they are in
 .Fn subwin .
 .Ds
+.Fn doupdate ""
+.De
+Synchronize the terminal screen with the virtual screen that
+has had window contents added to it by calls to
+.Fn wnoutrefresh .
+.Ds
 .Fn dupwin "WINDOW *win"
 .De
 Creates an exact copy of the window
@@ -1223,6 +1229,13 @@ characters of the string
 are output to the current \*y position of the window specified by
 .Vn win.
 .Ds
+.Fn wnoutrefresh "WINDOW *win"
+.De
+Add the window contents to a virtual screen.  Several windows can be added
+before a call to
+.Fn doupdate ,
+thus allowing the screen to updated in an efficient manner.
+.Ds
 .Fn wtouchln "WINDOW *win" "int line" "int n" "int changed"
 .De
 If 

lib/libcurses/curses.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: curses.3,v 1.24 2000/04/26 12:29:47 blymn Exp $
+.\"	$NetBSD: curses.3,v 1.25 2000/04/27 00:28:28 jdc Exp $
 .\"
 .\" Copyright (c) 1985, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -123,6 +123,7 @@ normal, 2 is high visibility.  Returns previous value on success.
 .It derwin(win,lines,cols,begin_y,begin_x)\ 	create a subwindow
 relative to 
 .Em win.
+.It doupdate()	make current screen look like virtual screen 
 .It dupwin(win)	duplicate
 .Em win
 .It echo()	set echo mode
@@ -314,6 +315,9 @@ on window
 .Em win
 .It wmove(win,y,x)	set current (y,x) co-ordinates on
 .Em win
+.It wnoutrefresh(win)	add
+.Em win
+to virtual screen
 .It wprintw(win,fmt,arg1,arg2,...)\ 	printf on
 .Em win
 .It wrefresh(win)	make screen look like