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 _nexpand()              Change Size of Near Heap Memory Block

 #include   <malloc.h>

 void _near *_nexpand(memblock, size);
 void _near *memblock;          Pointer to near heap memory block
 size_t size;                   New size (bytes)

    _nexpand() is the near heap version of _expand(); it changes the
    size of a memory block, memblock, on the near heap to size,
    returning a pointer to the newly expanded block if successful. See
    _expand() for more information.

    Returns:    A pointer to the new block of allocated memory on
                the near heap if the allocation was successful; NULL
                otherwise.

 Portability:   Not supported by the ANSI standard.