2 Unix SMB/Netbios implementation.
4 some simple double linked list macros
5 Copyright (C) Andrew Tridgell 1998
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* To use these macros you must have a structure containing a next and
26 /* hook into the front of the list */
27 #define DLIST_ADD(list, p) \
31 (p)->next = (p)->prev = NULL; \
40 /* remove an element from a list - element doesn't have to be in list. */
41 #define DLIST_REMOVE(list, p) \
43 if ((p) == (list)) { \
45 if (list) (list)->prev = NULL; \
47 if ((p)->prev) (p)->prev->next = (p)->next; \
48 if ((p)->next) (p)->next->prev = (p)->prev; \
50 if ((p) && ((p) != (list))) (p)->next = (p)->prev = NULL; \
53 /* promote an element to the top of the list */
54 #define DLIST_PROMOTE(list, p) \
56 DLIST_REMOVE(list, p) \
60 /* hook into the end of the list - needs a tmp pointer */
61 #define DLIST_ADD_END(list, p, tmp) \
65 (p)->next = (p)->prev = NULL; \
67 for ((tmp) = (list); (tmp)->next; (tmp) = (tmp)->next) ; \
74 /* demote an element to the top of the list, needs a tmp pointer */
75 #define DLIST_DEMOTE(list, p, tmp) \
77 DLIST_REMOVE(list, p) \
78 DLIST_ADD_END(list, p, tmp) \