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_msize Functions
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─────Run-Time Library───────────────────────────────────────────────────────
 
  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:  _memavl, _memmax
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