times.c
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上传日期:2021-08-29
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文件大小:3k
- /************************************************************************
- * RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
- * Copyright (C) 2001-2003 Optical Access
- * Author: Alex Rozin
- *
- * This file is part of RSTP library.
- *
- * RSTP library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by the
- * Free Software Foundation; version 2.1
- *
- * RSTP library is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
- * General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with RSTP library; see the file COPYING. If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- **********************************************************************/
- /* "Times" API : bridgeTime, rootTimes, portTimes, designatedTimes, msgTimes */
-
- #include "base.h"
- int
- STP_compare_times (IN TIMEVALUES_T *t1, IN TIMEVALUES_T *t2)
- {
- if (t1->MessageAge < t2->MessageAge) return -1;
- if (t1->MessageAge > t2->MessageAge) return 1;
- if (t1->MaxAge < t2->MaxAge) return -2;
- if (t1->MaxAge > t2->MaxAge) return 2;
- if (t1->ForwardDelay < t2->ForwardDelay) return -3;
- if (t1->ForwardDelay > t2->ForwardDelay) return 3;
- if (t1->HelloTime < t2->HelloTime) return -4;
- if (t1->HelloTime > t2->HelloTime) return 4;
- return 0;
- }
- void
- STP_get_times (IN BPDU_BODY_T *b, OUT TIMEVALUES_T *v)
- {
- v->MessageAge = ntohs (*((unsigned short*) b->message_age)) >> 8;
- v->MaxAge = ntohs (*((unsigned short*) b->max_age)) >> 8;
- v->ForwardDelay = ntohs (*((unsigned short*) b->forward_delay)) >> 8;
- v->HelloTime = ntohs (*((unsigned short*) b->hello_time)) >> 8;
- }
- void
- STP_set_times (IN TIMEVALUES_T *v, OUT BPDU_BODY_T *b)
- {
- unsigned short mt;
- #define STP_SET_TIME(f, t)
- mt = htons (f << 8);
- memcpy (t, &mt, 2);
-
- STP_SET_TIME(v->MessageAge, b->message_age);
- STP_SET_TIME(v->MaxAge, b->max_age);
- STP_SET_TIME(v->ForwardDelay, b->forward_delay);
- STP_SET_TIME(v->HelloTime, b->hello_time);
- }
- void
- STP_copy_times (OUT TIMEVALUES_T *t, IN TIMEVALUES_T *f)
- {
- t->MessageAge = f->MessageAge;
- t->MaxAge = f->MaxAge;
- t->ForwardDelay = f->ForwardDelay;
- t->HelloTime = f->HelloTime;
- }