clist.h

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/*
 * $Id$
 *
 * circular list maintenance macros
 *
 * Copyright (C) 2005 iptelorg GmbH
 *
 * This file is part of ser, a free SIP server.
 *
 * ser is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * ser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* History:
 * --------
 *  2005-08-08  created by andrei
 */

#ifndef _clist_h
#define _clist_h

#define clist_init(c, next, prev) \
        do{ \
                (c)->next=(void*)(c); \
                (c)->prev=(void*)(c); \
        } while(0)



#define clist_insert_sublist(head, s, e, next, prev) \
        do{ \
                (s)->prev=(void*)(head); \
                (e)->next=(head)->next; \
                (e)->next->prev=(e); \
                (head)->next=s;   \
        }while(0)



#define clist_append_sublist(head, s, e, next, prev) \
        do{ \
                (s)->prev=(head)->prev; \
                (e)->next=(void*)(head); \
                (s)->prev->next=(s); \
                (head)->prev=(e);   \
        }while(0)




#define clist_rm_sublist(s, e, next, prev) \
        do{\
                (s)->prev->next=(e)->next;  \
                (e)->next->prev=(s)->prev ; \
        }while(0)



#define clist_insert(head, c, next, prev) \
        clist_insert_sublist(head, c, c, next, prev)



#define clist_append(head, c, next, prev) \
        clist_append_sublist(head, c, c, next, prev)



#define clist_rm(c, next, prev) \
        clist_rm_sublist(c, c, next, prev)



#define clist_foreach(head, v, dir) \
        for((v)=(head)->dir; (v)!=(void*)(head); (v)=(v)->dir)

#define clist_foreach_safe(head, v, bak,  dir) \
        for((v)=(head)->dir, (bak)=(v)->dir; (v)!=(void*)(head); \
                                (v)=(bak), (bak)=(v)->dir)
#endif