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 _bexpand()              Change Size of Memory Block in Based Heap

 #include    <malloc.h>

 void _based(void) *_bexpand(seg, memblock, size);
 _segment seg;                  Based heap segment
 void _based *memblock;         Pointer to already allocated memory
 size_t size;                   New size

    This is the based heap version of _expand(); seg is the selected
    based heap segment, memblock is the allocated memory block whose
    size is to be changed, and size is the new size of memblock in
    bytes. _bexpand() returns a pointer to the expanded memory block if
    successful; -1 otherwise. See _expand() for more information.

    Returns:    a pointer to the reallocated memory block if successful, or
                -1 for failure.

 Portability:   Not supported by the ANSI standard.