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       overlay, overwrite, copywin - overlay and manipulate overlapped curses windows


       #include <curses.h>

       int overlay(const WINDOW *srcwin, WINDOW *dstwin);
       int overwrite(const WINDOW *srcwin, WINDOW *dstwin);
       int copywin(const WINDOW *srcwin, WINDOW *dstwin, int sminrow,
             int smincol, int dminrow, int dmincol, int dmaxrow,
             int dmaxcol, int overlay);


   overlay, overwrite
       The overlay and overwrite routines overlay srcwin on top of dstwin.  scrwin and dstwin are
       not required to be the same size; only text where the two windows overlap is copied.   The
       difference is that overlay is non-destructive (blanks are not copied) whereas overwrite is

       The copywin routine provides a finer granularity of control over the overlay and overwrite
       routines.  As in the prefresh routine, a rectangle is specified in the destination window,
       (dminrow, dmincol) and (dmaxrow, dmaxcol), and the upper-left-corner  coordinates  of  the
       source  window, (sminrow, smincol).  If the argument overlay is true, then copying is non-
       destructive, as in overlay.


       Routines that return an integer return ERR upon failure, and OK (SVr4 only  specifies  "an
       integer value other than ERR") upon successful completion.

       X/Open  defines  no  error  conditions.   In  this  implementation,  copywin,  overlay and
       overwrite return an error if either of the window pointers are null, or if  some  part  of
       the window would be placed off-screen.


       Note that overlay and overwrite may be macros.


       The  XSI Curses standard, Issue 4 describes these functions (adding the const qualifiers).
       It further  specifies  their  behavior  in  the  presence  of  characters  with  multibyte
       renditions (not yet supported in this implementation).


       ncurses(3NCURSES), pad(3NCURSES), refresh(3NCURSES)