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 _fmsize()               Return Size of Far Memory Block

 #include   <malloc.h>

 size_t      _fmsize(ptr);
 void far   *ptr;                        Pointer to memory block

    _fmsize() returns the number of bytes in the memory block pointed to
    by 'ptr'.  The block should have been allocated with _fmalloc().

    Returns:    Size in bytes of the memory block.

      Notes:    Use _msize() to get the size of blocks allocated with
                malloc(), calloc(), or realloc().

 Portability:   Applies to MS DOS only.

                Use _nmsize() to get the size of blocks allocated with
                _nmalloc().

   -------------------------------- Example ---------------------------------

    The following statements allocate 500 bytes in a far data segment and
    report the size of the memory allocated.

           #include <malloc.h>
           #include <stdio.h>     /* for printf and NULL */

           char far *far_memptr;

           main()
           {
               if ((far_memptr = _fmalloc(500)) == NULL)
                   printf("not enough room to allocate memory\n");
               else
                   printf("%u bytes allocated\n", _fmsize(far_memptr));
           }