1/*
2 * IS-IS Rout(e)ing protocol - isis_flags.c
3 *                             Routines for manipulation of SSN and SRM flags
4 *
5 * Copyright (C) 2001,2002   Sampo Saaristo
6 *                           Tampere University of Technology
7 *                           Institute of Communications Engineering
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public Licenseas published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 * This program is distributed in the hope that it will be useful,but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
17 * more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
22 */
23
24#include <zebra.h>
25#include "log.h"
26#include "linklist.h"
27
28#include "isisd/isis_constants.h"
29#include "isisd/isis_common.h"
30#include "isisd/isis_flags.h"
31
32void
33flags_initialize (struct flags *flags)
34{
35  flags->maxindex = 0;
36  flags->free_idcs = NULL;
37}
38
39long int
40flags_get_index (struct flags *flags)
41{
42  struct listnode *node;
43  long int index;
44
45  if (flags->free_idcs == NULL || flags->free_idcs->count == 0)
46    {
47      index = flags->maxindex++;
48    }
49  else
50    {
51      node = listhead (flags->free_idcs);
52      index = (long int) listgetdata (node);
53      listnode_delete (flags->free_idcs, (void *) index);
54      index--;
55    }
56
57  return index;
58}
59
60void
61flags_free_index (struct flags *flags, long int index)
62{
63  if (index + 1 == flags->maxindex)
64    {
65      flags->maxindex--;
66      return;
67    }
68
69  if (flags->free_idcs == NULL)
70    {
71      flags->free_idcs = list_new ();
72    }
73
74  listnode_add (flags->free_idcs, (void *) (index + 1));
75
76  return;
77}
78
79int
80flags_any_set (u_int32_t * flags)
81{
82  u_int32_t zero[ISIS_MAX_CIRCUITS];
83  memset (zero, 0x00, ISIS_MAX_CIRCUITS * 4);
84
85  return bcmp (flags, zero, ISIS_MAX_CIRCUITS * 4);
86}
87