mirror of
https://git.proxmox.com/git/mirror_frr
synced 2025-11-04 13:30:17 +00:00
896014f4bc
The FSF's address changed, and we had a mixture of comment styles for the GPL file header. (The style with * at the beginning won out with 580 to 141 in existing files.) Note: I've intentionally left intact other "variations" of the copyright header, e.g. whether it says "Zebra", "Quagga", "FRR", or nothing. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
/* 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 this program; see the file COPYING; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef _ZEBRA_LINKLIST_H
|
|
#define _ZEBRA_LINKLIST_H
|
|
|
|
/* listnodes must always contain data to be valid. Adding an empty node
|
|
* to a list is invalid
|
|
*/
|
|
struct listnode
|
|
{
|
|
struct listnode *next;
|
|
struct listnode *prev;
|
|
|
|
/* private member, use getdata() to retrieve, do not access directly */
|
|
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);
|
|
|
|
/* callback to free user-owned data when listnode is deleted. supplying
|
|
* this callback is very much encouraged!
|
|
*/
|
|
void (*del) (void *val);
|
|
};
|
|
|
|
#define listnextnode(X) ((X) ? ((X)->next) : NULL)
|
|
#define listhead(X) ((X) ? ((X)->head) : NULL)
|
|
#define listtail(X) ((X) ? ((X)->tail) : NULL)
|
|
#define listcount(X) ((X)->count)
|
|
#define list_isempty(X) ((X)->head == NULL && (X)->tail == NULL)
|
|
#define listgetdata(X) (assert((X)->data != NULL), (X)->data)
|
|
|
|
/* Prototypes. */
|
|
extern struct list *list_new(void); /* encouraged: set list.del callback on new lists */
|
|
extern void list_free (struct list *);
|
|
|
|
extern void listnode_add (struct list *, void *);
|
|
extern void listnode_add_sort (struct list *, void *);
|
|
extern struct listnode *listnode_add_after (struct list *, struct listnode *, void *);
|
|
extern struct listnode *listnode_add_before (struct list *, struct listnode *, void *);
|
|
extern void listnode_move_to_tail (struct list *, struct listnode *);
|
|
extern void listnode_delete (struct list *, void *);
|
|
extern struct listnode *listnode_lookup (struct list *, void *);
|
|
extern void *listnode_head (struct list *);
|
|
|
|
extern void list_delete (struct list *);
|
|
extern void list_delete_all_node (struct list *);
|
|
|
|
/* For ospfd and ospf6d. */
|
|
extern void list_delete_node (struct list *, struct listnode *);
|
|
|
|
/* For ospf_spf.c */
|
|
extern void list_add_list (struct list *, struct list *);
|
|
|
|
/* List iteration macro.
|
|
* Usage: for (ALL_LIST_ELEMENTS (...) { ... }
|
|
* It is safe to delete the listnode using this macro.
|
|
*/
|
|
#define ALL_LIST_ELEMENTS(list,node,nextnode,data) \
|
|
(node) = listhead(list), ((data) = NULL); \
|
|
(node) != NULL && \
|
|
((data) = listgetdata(node),(nextnode) = node->next, 1); \
|
|
(node) = (nextnode), ((data) = NULL)
|
|
|
|
/* read-only list iteration macro.
|
|
* Usage: as per ALL_LIST_ELEMENTS, but not safe to delete the listnode Only
|
|
* use this macro when it is *immediately obvious* the listnode is not
|
|
* deleted in the body of the loop. Does not have forward-reference overhead
|
|
* of previous macro.
|
|
*/
|
|
#define ALL_LIST_ELEMENTS_RO(list,node,data) \
|
|
(node) = listhead(list), ((data) = NULL);\
|
|
(node) != NULL && ((data) = listgetdata(node), 1); \
|
|
(node) = listnextnode(node), ((data) = NULL)
|
|
|
|
/* these *do not* cleanup list nodes and referenced data, as the functions
|
|
* do - these macros simply {de,at}tach a listnode from/to a list.
|
|
*/
|
|
|
|
/* List node attach macro. */
|
|
#define LISTNODE_ATTACH(L,N) \
|
|
do { \
|
|
(N)->prev = (L)->tail; \
|
|
(N)->next = NULL; \
|
|
if ((L)->head == NULL) \
|
|
(L)->head = (N); \
|
|
else \
|
|
(L)->tail->next = (N); \
|
|
(L)->tail = (N); \
|
|
(L)->count++; \
|
|
} while (0)
|
|
|
|
/* List node detach macro. */
|
|
#define LISTNODE_DETACH(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 */
|