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     Functions in the _msize family return the size, in bytes, of the
     memory block allocated by a call to the appropriate version of the
     calloc, malloc, or realloc function.
 
     In large data models (compact-, large-, and huge-model programs),
     _msize maps to _fmsize. In small data models (tiny-, small- and
     medium-model programs), _msize maps to _nmsize.
 
     The location of the memory block is indicated below:
 
     Function     Data Segment
 
      msize       Depends on data model of program
     _bmsize      Based-heap segment specified by <seg> value
     _fmsize      Far heap (outside default data segment)
     _nmsize      Default data segment (inside near heap)
 
     Return Value
 
     All four functions return the size (in bytes) as an unsigned
     integer.
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