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 _getwritemode()         Get current logical write mode

 #include   <graph.h>

 short _getwritemode(void);

    _getwritemode() returns the logical write mode currently used by
    the functions _lineto(), _rectangle(), and _polygon(). The
    possible returns are:

                _GPSET _GAND, _GOR, _GPRESET, and _GXOR

    Returns:     The default value is _GPSET; other possibilities
                 are _GAND, _GOR, _GPRESET, and _GXOR.

 Portability:   Not supported by the ANSI standard.