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    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: void
   33: flags_initialize (struct flags *flags)
   34: {
   35:   flags->maxindex = 0;
   36:   flags->free_idcs = NULL;
   37: }
   38: 
   39: long int
   40: flags_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: 
   60: void
   61: flags_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: 
   79: int
   80: flags_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: }