Cleaned up usage of linked lists and added missing functionality.

- Added a list_remove_first() which is generally better than list_remove()
  provided you want to remove the first element.
- Added a list_append_list() to append and move all nodes from one list to
  another.

src/core/eventqueue.c

@@ -90,16 +90,10 @@ int event_queue_process(struct event_queue* queue)
 		
 	/* unlock queue */
 	queue->locked = 0;
-	
+
 	/* transfer from secondary queue to the primary queue. */
-	data = (struct event_data*) list_get_first(queue->q2);
-	while (data)
-	{
-		list_remove(queue->q2, data);
-		list_append(queue->q1, data);
-		data = (struct event_data*) list_get_first(queue->q2);
-	}
-	
+	list_append_list(queue->q1, queue->q2);
+
 	/* if more events exist, schedule it */
 	if (list_size(queue->q1))
 	{

src/core/hub.c

@@ -1320,9 +1320,7 @@ void hub_logout_log(struct hub_info* hub, struct hub_user* user)
 	list_append(hub->logout_info, loginfo);
 	while (list_size(hub->logout_info) > (size_t) hub->config->max_logout_log)
 	{
-		struct hub_logout_info* entry = list_get_first(hub->logout_info);
-		list_remove(hub->logout_info, entry);
-		hub_free(entry);
+		list_remove_first(hub->logout_info, hub_free);
 	}
 }
 

src/core/pluginloader.c

@@ -229,16 +229,16 @@ int plugin_initialize(struct hub_config* config, struct hub_info* hub)
 	return 0;
 }
 
+static void plugin_unload_ptr(void* ptr)
+{
+	struct plugin_handle* plugin = (struct plugin_handle*) ptr;
+	plugin_unload(plugin);
+}
+
+
 void plugin_shutdown(struct uhub_plugins* handle)
 {
-	struct plugin_handle* plugin = (struct plugin_handle*) list_get_first(handle->loaded);
-	while (plugin)
-	{
-		list_remove(handle->loaded, plugin);
-		plugin_unload(plugin);
-		plugin = (struct plugin_handle*) list_get_first(handle->loaded);
-	}
-
+	list_clear(handle->loaded, plugin_unload_ptr);
 	list_destroy(handle->loaded);
 }
 

src/plugins/mod_chat_history.c

@@ -50,9 +50,7 @@ static void history_add(struct plugin_handle* plugin, struct plugin_user* from,
 	list_append(data->chat_history, log);
 	while (list_size(data->chat_history) > data->history_max)
 	{
-		char* msg = list_get_first(data->chat_history);
-		list_remove(data->chat_history, msg);
-		hub_free(msg);
+		list_remove_first(data->chat_history, hub_free);
 	}
 }
 

src/util/list.c

@@ -80,6 +80,35 @@ void list_append(struct linked_list* list, void* data_ptr)
 	list->size++;
 }
 
+void list_append_list(struct linked_list* list, struct linked_list* other)
+{
+	/* Anything to move? */
+	if (!other->size)
+		return;
+
+	if (!list->size)
+	{
+		/* If the list is empty, just move the pointers */
+		list->size = other->size;
+		list->first = other->first;
+		list->last = other->last;
+		list->iterator = other->iterator;
+	}
+	else
+	{
+		other->first->prev = list->last;
+		list->last->next = other->first;
+		list->last = other->last;
+		list->size += other->size;
+	}
+
+	/* Make sure the original list appears empty */
+	other->size = 0;
+	other->first = NULL;
+	other->last = NULL;
+	other->iterator = NULL;
+}
+
 
 void list_remove(struct linked_list* list, void* data_ptr)
 {
@@ -113,6 +142,30 @@ void list_remove(struct linked_list* list, void* data_ptr)
 	}
 }
 
+void list_remove_first(struct linked_list* list, void (*free_handle)(void* ptr))
+{
+	struct node* node = list->first;
+
+	list->iterator = NULL;
+
+	if (!node)
+		return;
+
+	list->first = node->next;
+
+	if (list->first)
+		list->first->prev = NULL;
+
+	if (list->last == node)
+		list->last = NULL;
+
+	list->size--;
+
+	if (free_handle)
+		free_handle(node->ptr);
+	hub_free(node);
+}
+
 
 size_t list_size(struct linked_list* list)
 {

src/util/list.h

@@ -42,6 +42,13 @@ extern void list_clear(struct linked_list*, void (*free_handle)(void* ptr) );
 
 extern void list_append(struct linked_list* list, void* data_ptr);
 
+/**
+ * A special list append that moves all nodes from other_list to list.
+ * The other list will be empty.
+ */
+extern void list_append_list(struct linked_list* list, struct linked_list* other);
+
+
 /**
  * Remove data_ptr from the list. If multiple versions occur, only the first one is removed.
  */
@@ -57,6 +64,12 @@ extern void* list_get_prev(struct linked_list*);
 extern struct node* list_get_first_node(struct linked_list*);
 extern struct node* list_get_last_node(struct linked_list*);
 
+/**
+ * Remove the first element, and call the free_handle function (if not NULL)
+ * to ensure the data is freed also.
+ */
+extern void list_remove_first(struct linked_list* list, void (*free_handle)(void* ptr));
+
 #define LIST_FOREACH(TYPE, ITEM, LIST, BLOCK) \
 		for (ITEM = (TYPE) list_get_first(LIST); ITEM; ITEM = (TYPE) list_get_next(LIST)) \
 			BLOCK