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