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     The _heapadd and _bheapadd functions add an unused area of memory
     to the heap. The _bheapadd function adds the memory to the
     specified based heap <seg>. The _heapadd function looks at the
     segment value and, if it is DGROUP, adds the memory to the near
     heap. Otherwise, _heapadd adds the memory to the far heap.
 
     Return Value
 
     These functions return 0 if successful, or -1 if an error occurs.
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