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-rw-r--r--lib/util/dlinklist.h113
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diff --git a/lib/util/dlinklist.h b/lib/util/dlinklist.h
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+/*
+ Unix SMB/CIFS implementation.
+ some simple double linked list macros
+ Copyright (C) Andrew Tridgell 1998
+
+ This program 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 3 of the License, or
+ (at your option) any later version.
+
+ This program 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, see <http://www.gnu.org/licenses/>.
+*/
+
+/* To use these macros you must have a structure containing a next and
+ prev pointer */
+
+#ifndef _DLINKLIST_H
+#define _DLINKLIST_H
+
+
+/* hook into the front of the list */
+#define DLIST_ADD(list, p) \
+do { \
+ if (!(list)) { \
+ (list) = (p); \
+ (p)->next = (p)->prev = NULL; \
+ } else { \
+ (list)->prev = (p); \
+ (p)->next = (list); \
+ (p)->prev = NULL; \
+ (list) = (p); \
+ }\
+} while (0)
+
+/* remove an element from a list - element doesn't have to be in list. */
+#define DLIST_REMOVE(list, p) \
+do { \
+ if ((p) == (list)) { \
+ (list) = (p)->next; \
+ if (list) (list)->prev = NULL; \
+ } else { \
+ if ((p)->prev) (p)->prev->next = (p)->next; \
+ if ((p)->next) (p)->next->prev = (p)->prev; \
+ } \
+ if ((p) != (list)) (p)->next = (p)->prev = NULL; \
+} while (0)
+
+/* promote an element to the top of the list */
+#define DLIST_PROMOTE(list, p) \
+do { \
+ DLIST_REMOVE(list, p); \
+ DLIST_ADD(list, p); \
+} while (0)
+
+/* hook into the end of the list - needs the entry type */
+#define DLIST_ADD_END(list, p, type) \
+do { \
+ if (!(list)) { \
+ (list) = (p); \
+ (p)->next = (p)->prev = NULL; \
+ } else { \
+ type tmp; \
+ for (tmp = (list); tmp->next; tmp = tmp->next) ; \
+ tmp->next = (p); \
+ (p)->next = NULL; \
+ (p)->prev = tmp; \
+ } \
+} while (0)
+
+/* insert 'p' after the given element 'el' in a list. If el is NULL then
+ this is the same as a DLIST_ADD() */
+#define DLIST_ADD_AFTER(list, p, el) \
+do { \
+ if (!(list) || !(el)) { \
+ DLIST_ADD(list, p); \
+ } else { \
+ p->prev = el; \
+ p->next = el->next; \
+ el->next = p; \
+ if (p->next) p->next->prev = p; \
+ }\
+} while (0)
+
+/* demote an element to the end of the list, needs a tmp pointer */
+#define DLIST_DEMOTE(list, p, tmp) \
+do { \
+ DLIST_REMOVE(list, p); \
+ DLIST_ADD_END(list, p, tmp); \
+} while (0)
+
+/* concatenate two lists - putting all elements of the 2nd list at the
+ end of the first list */
+#define DLIST_CONCATENATE(list1, list2, type) \
+do { \
+ if (!(list1)) { \
+ (list1) = (list2); \
+ } else { \
+ type tmp; \
+ for (tmp = (list1); tmp->next; tmp = tmp->next) ; \
+ tmp->next = (list2); \
+ if (list2) { \
+ (list2)->prev = tmp; \
+ } \
+ } \
+} while (0)
+
+#endif /* _DLINKLIST_H */