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     The _memmax function returns the size (in bytes) of the largest
     contiguous block of memory that can be allocated from the near
     heap (i.e., the default data segment). Calling _nmalloc(_memmax())
     will succeed as long as _memmax returns a nonzero value.
 
     Return Value
 
     The function returns the block size, if successful. Otherwise, it
     returns 0, indicating that nothing more can be allocated from the
     near heap.
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