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126 lines
5.1 KiB
C
126 lines
5.1 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tp_seq.h 8.1 (Berkeley) 6/10/93
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* $Id: tp_seq.h,v 1.2 1994/08/02 07:51:22 davidg Exp $
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*/
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#ifndef _NETISO_TP_SEQ_H_
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#define _NETISO_TP_SEQ_H_
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/***********************************************************
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Copyright IBM Corporation 1987
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of IBM not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/*
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* ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
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*/
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/*
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* ARGO TP
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*
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* $Header: /home/ncvs/src/sys/netiso/tp_seq.h,v 1.2 1994/08/02 07:51:22 davidg Exp $
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* $Source: /home/ncvs/src/sys/netiso/tp_seq.h,v $
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*
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* These macros perform sequence number arithmetic modulo (2**7 or 2**31).
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* The relevant fields in the tpcb are:
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* tp_seqmask : the mask of bits that define the sequence space.
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* tp_seqbit : 1 + tp_seqmask
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* tp_seqhalf : tp_seqbit / 2 or half the sequence space (rounded up)
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* Not exactly fast, but at least it's maintainable.
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*/
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#define SEQ(tpcb,x) \
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((x) & (tpcb)->tp_seqmask)
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#define SEQ_GT(tpcb, seq, operand ) \
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( ((int)((seq)-(operand)) > 0)\
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? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
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: !(-((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
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#define SEQ_GEQ(tpcb, seq, operand ) \
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( ((int)((seq)-(operand)) >= 0)\
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? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
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: !((-((int)(seq)-(operand))) < (int)(tpcb)->tp_seqhalf))
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#define SEQ_LEQ(tpcb, seq, operand ) \
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( ((int)((seq)-(operand)) <= 0)\
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? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
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: !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
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#define SEQ_LT(tpcb, seq, operand ) \
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( ((int)((seq)-(operand)) < 0)\
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? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
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: !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
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#define SEQ_MIN(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? b : a)
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#define SEQ_MAX(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? a : b)
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#define SEQ_INC(tpcb, Seq) ((++Seq), ((Seq) &= (tpcb)->tp_seqmask))
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#define SEQ_DEC(tpcb, Seq)\
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((Seq) = (((Seq)+(unsigned)((int)(tpcb)->tp_seqbit - 1))&(tpcb)->tp_seqmask))
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/* (amt) had better be less than the seq bit ! */
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#define SEQ_SUB(tpcb, Seq, amt)\
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(((Seq) + (unsigned)((int)(tpcb)->tp_seqbit - amt)) & (tpcb)->tp_seqmask)
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#define SEQ_ADD(tpcb, Seq, amt) (((Seq) + (unsigned)amt) & (tpcb)->tp_seqmask)
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#define IN_RWINDOW(tpcb, seq, lwe, uwe)\
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( SEQ_GEQ(tpcb, seq, lwe) && SEQ_LT(tpcb, seq, uwe) )
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#define IN_SWINDOW(tpcb, seq, lwe, uwe)\
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( SEQ_GT(tpcb, seq, lwe) && SEQ_LEQ(tpcb, seq, uwe) )
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#endif
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