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
  25 #include <zebra.h>
  26 #include "log.h"
  27 #include "linklist.h"
  28
  29 #include "isisd/isis_constants.h"
  30 #include "isisd/isis_common.h"
  31 #include "isisd/isis_flags.h"
  32
  33 int
  34 flags_get_index (struct flags *flags)
  35 {
  36   struct listnode *node;
  37   int index;
  38
  39   if (flags->free_idcs == NULL || flags->free_idcs->count == 0) {
  40     flags->maxindex++;
  41     index = flags->maxindex;
  42   } else {
  43     node = listhead (flags->free_idcs);
  44     index = (int) getdata (node);
  45     listnode_delete (flags->free_idcs, (void *)index);
  46   }
  47
  48   return index;
  49 }
  50
  51 void
  52 flags_free_index (struct flags *flags, int index)
  53 {
  54   if (flags->free_idcs == NULL) {
  55     flags->free_idcs = list_new ();
  56   }
  57
  58   listnode_add (flags->free_idcs, (void *)index);
  59
  60   return;
  61 }
  62
  63 int
  64 flags_any_set (u_int32_t *flags)
  65 {
  66
  67   u_int32_t zero[ISIS_MAX_CIRCUITS];
  68   memset (zero, 0x00, ISIS_MAX_CIRCUITS*4);
  69
  70   return bcmp(flags, zero, ISIS_MAX_CIRCUITS*4);
  71 }