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#ifndef foollistfoo
#define foollistfoo
/* $Id$ */
/***
This file is part of avahi.
avahi is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
avahi 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 Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
/* Some macros for maintaining doubly linked lists */
#include <assert.h>
/* The head of the linked list. Use this in the structure that shall
* contain the head of the linked list */
#define AVAHI_LLIST_HEAD(t,name) t *name
/* The pointers in the linked list's items. Use this in the item structure */
#define AVAHI_LLIST_FIELDS(t,name) t *name##_next, *name##_prev
/* Initialize the list's head */
#define AVAHI_LLIST_HEAD_INIT(t,head) do { (head) = NULL; } while(0)
/* Initialize a list item */
#define AVAHI_LLIST_INIT(t,name,item) do { \
t *_item = (item); \
assert(_item); \
_item->name##_prev = _item->name##_next = NULL; \
} while(0)
/* Prepend an item to the list */
#define AVAHI_LLIST_PREPEND(t,name,head,item) do { \
t **_head = &(head), *_item = (item); \
assert(_item); \
if ((_item->name##_next = *_head)) \
_item->name##_next->name##_prev = _item; \
_item->name##_prev = NULL; \
*_head = _item; \
} while (0)
/* Remove an item from the list */
#define AVAHI_LLIST_REMOVE(t,name,head,item) do { \
t **_head = &(head), *_item = (item); \
assert(_item); \
if (_item->name##_next) \
_item->name##_next->name##_prev = _item->name##_prev; \
if (_item->name##_prev) \
_item->name##_prev->name##_next = _item->name##_next; \
else {\
assert(*_head == _item); \
*_head = _item->name##_next; \
} \
_item->name##_next = _item->name##_prev = NULL; \
} while(0)
#endif
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