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Synopsis:
    #include <malloc.h>
    size_t _msize( void *buffer );
    size_t _bmsize( __segment seg, void __based(void) *buffer );
    size_t _fmsize( void __far *buffer );
    size_t _nmsize( void __near *buffer );

Description:
    The _msize functions return the size of the memory block pointed to by
    buffer that was allocated by a call to the appropriate version of the
     calloc,  malloc, or  realloc functions.

    You must use the correct _msize function as listed below depending on
    which heap the memory block belongs to.

    Function     Heap

_msize
    Depends on data model of the program

_bmsize
    Based heap specified by seg value

_fmsize
    Far heap (outside the default data segment)

_nmsize
    Near heap (inside the default data segment)

    In small data models (small and medium memory models), _msize maps to
     _nmsize.  In large data models (compact, large and huge memory models),
    _msize maps to  _fmsize.

Returns:
    The _msize functions return the size of the memory block pointed to by
    buffer.

Example:
    #include <stdio.h>
    #include <malloc.h>

    void main()
      {
        void *buffer;

        buffer = malloc( 999 );
        printf( "Size of block is %u bytes\n",
                    _msize( buffer ) );
      }

    produces the following:

    Size of block is 1000 bytes

Classification:
    WATCOM

Systems:
     _msize - All, Netware

    _bmsize - DOS/16, Windows, QNX/16, OS/2 1.x(all)
    _fmsize - DOS/16, Windows, QNX/16, OS/2 1.x(all)
    _nmsize - DOS, Windows, Win386, Win32, QNX, OS/2 1.x, OS/2 1.x(MT),
    OS/2-32

See Also:
    calloc Functions, _expand Functions, free Functions, halloc, hfree,
    malloc Functions, realloc Functions, sbrk