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/* Generic linked list
* Copyright (C) 1997, 2000 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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, or (at your option) any
* later version.
*
* GNU Zebra 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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef _ZEBRA_LINKLIST_H
#define _ZEBRA_LINKLIST_H
typedef struct list *list;
typedef struct listnode *listnode;
struct listnode
{
struct listnode *next;
struct listnode *prev;
void *data;
};
struct list
{
struct listnode *head;
struct listnode *tail;
/* invariant: count is the number of listnodes in the list */
unsigned int count;
/*
* Returns -1 if val1 < val2, 0 if equal?, 1 if val1 > val2.
* Used as definition of sorted for listnode_add_sort
*/
int (*cmp) (void *val1, void *val2);
void (*del) (void *val);
};
#define nextnode(X) ((X) = (X)->next)
#define listhead(X) ((X)->head)
#define listcount(X) ((X)->count)
#define list_isempty(X) ((X)->head == NULL && (X)->tail == NULL)
#define getdata(X) ((X)->data)
/* Prototypes. */
struct list *list_new();
void list_free (struct list *);
void listnode_add (struct list *, void *);
void listnode_add_sort (struct list *, void *);
void listnode_add_after (struct list *, struct listnode *, void *);
void listnode_delete (struct list *, void *);
struct listnode *listnode_lookup (struct list *, void *);
void *listnode_head (struct list *);
void list_delete (struct list *);
void list_delete_all_node (struct list *);
/* For ospfd and ospf6d. */
void list_delete_node (list, listnode);
/* For ospf_spf.c */
void list_add_node_prev (list, listnode, void *);
void list_add_node_next (list, listnode, void *);
void list_add_list (list, list);
/* List iteration macro. */
#define LIST_LOOP(L,V,N) \
for ((N) = (L)->head; (N); (N) = (N)->next) \
if (((V) = (N)->data) != NULL)
/* List node add macro. */
#define LISTNODE_ADD(L,N) \
do { \
(N)->prev = (L)->tail; \
if ((L)->head == NULL) \
(L)->head = (N); \
else \
(L)->tail->next = (N); \
(L)->tail = (N); \
(L)->count++; \
} while (0)
/* List node delete macro. */
#define LISTNODE_DELETE(L,N) \
do { \
if ((N)->prev) \
(N)->prev->next = (N)->next; \
else \
(L)->head = (N)->next; \
if ((N)->next) \
(N)->next->prev = (N)->prev; \
else \
(L)->tail = (N)->prev; \
(L)->count--; \
} while (0)
#endif /* _ZEBRA_LINKLIST_H */
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