C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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_setwritemode
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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _setwritemode function sets the current logical write mode,
     which is used when drawing lines with the _lineto, _polygon, and
     _rectangle functions.
 
     The <action> argument defines the write mode. The possible values
     are _GAND, _GOR, _GPRESET, _GPSET, and _GXOR.
 
     Return Value
 
     The _setwritemode function returns the previous write mode, or -1
     if an error occurs.
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