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Annotation of embedaddon/quagga/isisd/isis_flags.c, revision 1.1

1.1     ! misho       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: int
        !            40: flags_get_index (struct flags *flags)
        !            41: {
        !            42:   struct listnode *node;
        !            43:   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 = (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, 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: }