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farrealloc()             Adjust Allocated Block in Far Heap

 #include   <alloc.h>

 void far *farrealloc(block,newsize);
 void far *block;                        Allocated block in memory
 unsigned long newsize;                  New size of block

    farrealloc() changes the size of the allocated 'block' to 'newsize'.
    If necessary, the contents are copied to a new location. For
    allocating from the far heap, note that:

                all of available RAM can be allocated
                blocks larger than 64K can be allocated
                far pointers are used to access the allocated blocks

    Returns:    The address of the reallocated block, which may be
                different than the address of the original block.  NULL
                is returned if the block cannot be reallocated.