1/************************************************************************
2 * RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
3 * Copyright (C) 2001-2003 Optical Access
4 * Author: Alex Rozin
5 *
6 * This file is part of RSTP library.
7 *
8 * RSTP library is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by the
10 * Free Software Foundation; version 2.1
11 *
12 * RSTP library is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with RSTP library; see the file COPYING.  If not, write to the Free
19 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 * 02111-1307, USA.
21 **********************************************************************/
22
23/* "Times" API : bridgeTime, rootTimes, portTimes, designatedTimes, msgTimes */
24
25#include "base.h"
26
27int
28STP_compare_times (IN TIMEVALUES_T *t1, IN TIMEVALUES_T *t2)
29{
30  if (t1->MessageAge < t2->MessageAge)     return -1;
31  if (t1->MessageAge > t2->MessageAge)     return  1;
32
33  if (t1->MaxAge < t2->MaxAge)             return -2;
34  if (t1->MaxAge > t2->MaxAge)             return  2;
35
36  if (t1->ForwardDelay < t2->ForwardDelay) return -3;
37  if (t1->ForwardDelay > t2->ForwardDelay) return  3;
38
39  if (t1->HelloTime < t2->HelloTime)       return -4;
40  if (t1->HelloTime > t2->HelloTime)       return  4;
41
42  return 0;
43}
44
45void
46STP_get_times (IN BPDU_BODY_T *b, OUT TIMEVALUES_T *v)
47{
48  /* LINTED: alignment */
49  v->MessageAge =   ntohs (*((unsigned short*) b->message_age))   >> 8;
50  /* LINTED: alignment */
51  v->MaxAge =       ntohs (*((unsigned short*) b->max_age))       >> 8;
52  /* LINTED: alignment */
53  v->ForwardDelay = ntohs (*((unsigned short*) b->forward_delay)) >> 8;
54  /* LINTED: alignment */
55  v->HelloTime =    ntohs (*((unsigned short*) b->hello_time))    >> 8;
56}
57
58void
59STP_set_times (IN TIMEVALUES_T *v, OUT BPDU_BODY_T *b)
60{
61  unsigned short mt;
62  #define STP_SET_TIME(f, t)        \
63     mt = htons (f << 8);           \
64     (void) memcpy (t, &mt, 2);
65
66  STP_SET_TIME(v->MessageAge,   b->message_age);
67  STP_SET_TIME(v->MaxAge,       b->max_age);
68  STP_SET_TIME(v->ForwardDelay, b->forward_delay);
69  STP_SET_TIME(v->HelloTime,    b->hello_time);
70}
71
72void
73STP_copy_times (OUT TIMEVALUES_T *t, IN TIMEVALUES_T *f)
74{
75  t->MessageAge = f->MessageAge;
76  t->MaxAge = f->MaxAge;
77  t->ForwardDelay = f->ForwardDelay;
78  t->HelloTime = f->HelloTime;
79}
80
81