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CentOS 7.0 - man page for copywin (centos section 3X)

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curs_overlay(3X)								 curs_overlay(3X)

       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);

       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 over-
       write 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  rendi-
       tions (not yet supported in this implementation).

       curses(3X), curs_pad(3X), curs_refresh(3X)

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