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  Include:   <malloc.h>
 
  Syntax:    size_t _msize( void *memblock );
             size_t _bmsize( _segment seg, void _based( void ) *memblock );
             size_t _fmsize( void _far *memblock );
             size_t _nmsize( void _near *memblock );
 
  Returns:   the size in bytes.
 
  See also:  calloc, _expand, _fmalloc, malloc, _nmalloc, realloc
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