usr/src/sys/deprecated/netdecnet/nsp_seq.h

/*      nsp_seq.h       1.2     82/05/15        */

/*
 * NSP sequence numbers are 12 bit integers operated
 * on with modular arithmetic.  These macros can be
 * used to compare and perform arithmetic on such integers.
 */
#define MAXSEQ  (1<<12)
#define SEQMASK (MAXSEQ-1)

#define SEQ_LSS(a, b)   (nsp_seqcmp(a, b) < 0)
#define SEQ_LEQ(a, b)   (nsp_seqcmp(a, b) <= 0)
#define SEQ_GTR(a, b)   (nsp_seqcmp(a, b) > 0)
#define SEQ_GEQ(a, b)   (nsp_seqcmp(a, b) >= 0)

#define SEQ_ADD(a, b)   (((a) + (b)) & SEQMASK)
#define SEQ_SUB(a, b)   (((a) - (b)) & SEQMASK)