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 _fexpand()              Change Size of Far Heap Allocated Memory Block

 #include   <malloc.h>

 void _far *_fexpand(memblock, size);
 void _far *memblock;           Pointer to block to expand
 size_t size;                   New size (bytes)

    This is the far heap version of _expand(); it can expand an
    allocated memory block, memblock on the far heap to size bytes.
    If successful, it returns a pointer to the newly expanded memory
    block. See _expand() for more information.

    Returns:    A pointer to the resized memory block if successful, NULL
                otherwise.

 Portability:   Not supported by the ANSI standard.