isisd/isis_flags.c

   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
  32 int
  33 flags_get_index (struct flags *flags)
  34 {
  35   struct listnode *node;
  36   int index;
  37
  38   if (flags->free_idcs == NULL || flags->free_idcs->count == 0)
  39     {
  40       flags->maxindex++;
  41       index = flags->maxindex;
  42     }
  43   else
  44     {
  45       node = listhead (flags->free_idcs);
  46       index = (int) listgetdata (node);
  47       listnode_delete (flags->free_idcs, (void *) index);
  48     }
  49
  50   return index;
  51 }
  52
  53 void
  54 flags_free_index (struct flags *flags, int index)
  55 {
  56   if (flags->free_idcs == NULL)
  57     {
  58       flags->free_idcs = list_new ();
  59     }
  60
  61   listnode_add (flags->free_idcs, (void *) index);
  62
  63   return;
  64 }
  65
  66 int
  67 flags_any_set (u_int32_t * flags)
  68 {
  69   u_int32_t zero[ISIS_MAX_CIRCUITS];
  70   memset (zero, 0x00, ISIS_MAX_CIRCUITS * 4);
  71
  72   return bcmp (flags, zero, ISIS_MAX_CIRCUITS * 4);
  73 }