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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _bheapseg function allocates a based-heap segment of at least
     <size> bytes. (The block can be larger than <size> bytes because
     of space required for alignment and for maintenance information.)
 
     The value returned by _bheapseg is the identifier of the based-
     heap segment. This value should be saved and used in subsequent
     calls to other based-heap functions. If the original block of
     memory is depleted (e.g., by calls to _bmalloc and _brealloc), the
     run-time code will try to enlarge the heap as necessary.
 
     The _bheapseg function can be called repeatedly. For each call,
     the run-time library allocates a new based-heap segment.
 
     Return Value
 
     The _bheapseg function returns the newly allocated segment
     selector to be saved for use in subsequent based-heap functions.
     A return value of _NULLSEG indicates failure.
 
     Always check the return from the _bheapseg function (especially
     when it is used in real mode), even if the amount of memory
     requested is small.
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