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1.1 ! root 1: /*- ! 2: * Copyright (c) 1991 The Regents of the University of California. ! 3: * All rights reserved. ! 4: * ! 5: * Redistribution and use in source and binary forms, with or without ! 6: * modification, are permitted provided that the following conditions ! 7: * are met: ! 8: * 1. Redistributions of source code must retain the above copyright ! 9: * notice, this list of conditions and the following disclaimer. ! 10: * 2. Redistributions in binary form must reproduce the above copyright ! 11: * notice, this list of conditions and the following disclaimer in the ! 12: * documentation and/or other materials provided with the distribution. ! 13: * 3. All advertising materials mentioning features or use of this software ! 14: * must display the following acknowledgement: ! 15: * This product includes software developed by the University of ! 16: * California, Berkeley and its contributors. ! 17: * 4. Neither the name of the University nor the names of its contributors ! 18: * may be used to endorse or promote products derived from this software ! 19: * without specific prior written permission. ! 20: * ! 21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ! 22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ! 23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ! 24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE ! 25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ! 26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS ! 27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ! 28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ! 29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY ! 30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ! 31: * SUCH DAMAGE. ! 32: * ! 33: * @(#)tp_seq.h 7.5 (Berkeley) 5/6/91 ! 34: */ ! 35: ! 36: /*********************************************************** ! 37: Copyright IBM Corporation 1987 ! 38: ! 39: All Rights Reserved ! 40: ! 41: Permission to use, copy, modify, and distribute this software and its ! 42: documentation for any purpose and without fee is hereby granted, ! 43: provided that the above copyright notice appear in all copies and that ! 44: both that copyright notice and this permission notice appear in ! 45: supporting documentation, and that the name of IBM not be ! 46: used in advertising or publicity pertaining to distribution of the ! 47: software without specific, written prior permission. ! 48: ! 49: IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ! 50: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL ! 51: IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ! 52: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, ! 53: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ! 54: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS ! 55: SOFTWARE. ! 56: ! 57: ******************************************************************/ ! 58: ! 59: /* ! 60: * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison ! 61: */ ! 62: /* ! 63: * ARGO TP ! 64: * ! 65: * $Header: tp_seq.h,v 5.1 88/10/12 12:20:59 root Exp $ ! 66: * $Source: /usr/argo/sys/netiso/RCS/tp_seq.h,v $ ! 67: * ! 68: * These macros perform sequence number arithmetic modulo (2**7 or 2**31). ! 69: * The relevant fields in the tpcb are: ! 70: * tp_seqmask : the mask of bits that define the sequence space. ! 71: * tp_seqbit : 1 + tp_seqmask ! 72: * tp_seqhalf : tp_seqbit / 2 or half the sequence space (rounded up) ! 73: * Not exactly fast, but at least it's maintainable. ! 74: */ ! 75: ! 76: #ifndef __TP_SEQ__ ! 77: #define __TP_SEQ__ ! 78: ! 79: #define SEQ(tpcb,x) \ ! 80: ((x) & (tpcb)->tp_seqmask) ! 81: ! 82: #define SEQ_GT(tpcb, seq, operand ) \ ! 83: ( ((int)((seq)-(operand)) > 0)\ ! 84: ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\ ! 85: : !(-((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf)) ! 86: ! 87: #define SEQ_GEQ(tpcb, seq, operand ) \ ! 88: ( ((int)((seq)-(operand)) >= 0)\ ! 89: ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\ ! 90: : !((-((int)(seq)-(operand))) < (int)(tpcb)->tp_seqhalf)) ! 91: ! 92: #define SEQ_LEQ(tpcb, seq, operand ) \ ! 93: ( ((int)((seq)-(operand)) <= 0)\ ! 94: ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\ ! 95: : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf)) ! 96: ! 97: #define SEQ_LT(tpcb, seq, operand ) \ ! 98: ( ((int)((seq)-(operand)) < 0)\ ! 99: ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\ ! 100: : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf)) ! 101: ! 102: #define SEQ_MIN(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? b : a) ! 103: ! 104: #define SEQ_MAX(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? a : b) ! 105: ! 106: #define SEQ_INC(tpcb, Seq) ((++Seq), ((Seq) &= (tpcb)->tp_seqmask)) ! 107: ! 108: #define SEQ_DEC(tpcb, Seq)\ ! 109: ((Seq) = (((Seq)+(unsigned)((int)(tpcb)->tp_seqbit - 1))&(tpcb)->tp_seqmask)) ! 110: ! 111: /* (amt) had better be less than the seq bit ! */ ! 112: ! 113: #define SEQ_SUB(tpcb, Seq, amt)\ ! 114: (((Seq) + (unsigned)((int)(tpcb)->tp_seqbit - amt)) & (tpcb)->tp_seqmask) ! 115: #define SEQ_ADD(tpcb, Seq, amt) (((Seq) + (unsigned)amt) & (tpcb)->tp_seqmask) ! 116: ! 117: ! 118: #define IN_RWINDOW(tpcb, seq, lwe, uwe)\ ! 119: ( SEQ_GEQ(tpcb, seq, lwe) && SEQ_LT(tpcb, seq, uwe) ) ! 120: ! 121: #define IN_SWINDOW(tpcb, seq, lwe, uwe)\ ! 122: ( SEQ_GT(tpcb, seq, lwe) && SEQ_LEQ(tpcb, seq, uwe) ) ! 123: ! 124: #endif __TP_SEQ__
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