/*
- * Sherlock Library -- Circular Linked Lists
+ * UCW Library -- Circular Linked Lists
*
* (c) 2003 Martin Mares <mj@ucw.cz>
*
* of the GNU Lesser General Public License.
*/
-#ifndef _SHERLOCK_CLISTS_H
-#define _SHERLOCK_CLISTS_H
+#ifndef _UCW_CLISTS_H
+#define _UCW_CLISTS_H
typedef struct cnode {
struct cnode *next, *prev;
return (n->prev != &l->head) ? (void *) n->prev : NULL;
}
+static inline int clist_empty(clist *l)
+{
+ return (l->head.next == &l->head);
+}
+
#define CLIST_WALK(n,list) for(n=(void*)(list).head.next; (cnode*)(n) != &(list).head; n=(void*)((cnode*)(n))->next)
+#define CLIST_WALK_DELSAFE(n,list,tmp) for(n=(void*)(list).head.next; tmp=(void*)((cnode*)(n))->next, (cnode*)(n) != &(list).head; n=(void*)tmp)
-static inline void clist_insert(cnode *what, cnode *after)
+static inline void clist_insert_after(cnode *what, cnode *after)
{
cnode *before = after->next;
what->next = before;
- what->prev = before->prev;
+ what->prev = after;
+ before->prev = what;
+ after->next = what;
+}
+
+static inline void clist_insert_before(cnode *what, cnode *before)
+{
+ cnode *after = before->prev;
+ what->next = before;
+ what->prev = after;
before->prev = what;
after->next = what;
}
static inline void clist_add_tail(clist *l, cnode *n)
{
- clist_insert(n, l->head.prev);
+ clist_insert_before(n, &l->head);
}
static inline void clist_add_head(clist *l, cnode *n)
{
- clist_insert(n, &l->head);
+ clist_insert_after(n, &l->head);
}
static inline void clist_remove(cnode *n)