X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=llist.h;fp=llist.h;h=e5787cd802523cf548ae81bdc64f2ac2269d0fd9;hb=0781d5363fb6fd723a2316fc7558aef6439b2f71;hp=0000000000000000000000000000000000000000;hpb=d6e2dbabccb08970da991e6d2b0fda7a56d83e6f;p=catta

diff --git a/llist.h b/llist.h
new file mode 100644
index 0000000..e5787cd
--- /dev/null
+++ b/llist.h
@@ -0,0 +1,50 @@
+#ifndef foollistfoo
+#define foollistfoo
+
+#include <glib.h>
+
+/* Some macros for maintaining doubly linked lists */
+
+/* The head of the linked list. Use this in the structure that shall
+ * contain the head of the linked list */
+#define FLX_LLIST_HEAD(t,name) t *name
+
+/* The pointers in the linked list's items. Use this in the item structure */
+#define FLX_LLIST_FIELDS(t,name) t *name##_next, *name##_prev
+
+/* Initialize the list's head */
+#define FLX_LLIST_HEAD_INIT(t,head) do { (head) = NULL; } while(0)
+
+/* Initialize a list item */
+#define FLX_LLIST_INIT(t,name,item) do { \
+                               t *_item = (item); \
+                               g_assert(_item); \
+                               _item->name##_prev = _item->name##_next = NULL; \
+                               } while(0)
+
+/* Prepend an item to the list */
+#define FLX_LLIST_PREPEND(t,name,head,item) do { \
+                                        t **_head = &(head), *_item = (item); \
+                                        g_assert(_item); \
+                                        if ((_item->name##_next = *_head)) \
+                                           _item->name##_next->name##_prev = _item; \
+                                        _item->name##_prev = NULL; \
+                                        *_head = _item; \
+                                        } while (0)
+
+/* Remove an item from the list */
+#define FLX_LLIST_REMOVE(t,name,head,item) do { \
+                                    t **_head = &(head), *_item = (item); \
+                                    g_assert(_item); \
+                                    if (_item->name##_next) \
+                                       _item->name##_next->name##_prev = _item->name##_prev; \
+                                    if (_item->name##_prev) \
+                                       _item->name##_prev->name##_next = _item->name##_next; \
+                                    else {\
+                                       g_assert(*_head == _item); \
+                                       *_head = _item->name##_next; \
+                                    } \
+                                    _item->name##_next = _item->name##_prev = NULL; \
+                                    } while(0)
+
+#endif