NAME
        CmpTime -- Compare two timeval structures.

   SYNOPSIS
        result = CmpTime( Dest, Source )
        D0                A0    A1

        long cmptime( struct timeval *, struct timeval *);

   FUNCTION
        This routine compares timeval structures

        A0 and A1 will be left unchanged

   INPUTS
        Dest, Source -- pointers to timeval structures.

   RESULTS
        result will be   0 if Dest has same time as source
                        -1 if Dest has more time than source
                        +1 if Dest has less time than source

   NOTES
        This function may be called from interrupts.

   SEE ALSO
        timer.device/addtime(),
        timer.device/subtime()

   BUGS
        Older version of this document had the sense of the return
        codes wrong; the code hasn't changed but the document has.