Added a function for obtaining the next item on the list. This makes list iterations nicer, as the ->next pointer now is hidden within the list abstraction.

core/lib/list.c

@@ -43,7 +43,7 @@
  *
  * Author: Adam Dunkels <adam@sics.se>
  *
- * $Id: list.c,v 1.4 2010/04/30 07:18:24 adamdunkels Exp $
+ * $Id: list.c,v 1.5 2010/06/15 18:54:27 adamdunkels Exp $
  */
 #include "lib/list.h"
 
@@ -311,4 +311,20 @@ list_insert(list_t list, void *previtem, void *newitem)
   }
 }
 /*---------------------------------------------------------------------------*/
+/**
+ * \brief      Get the next item following this item
+ * \param item A list item
+ * \returns    A next item on the list
+ *
+ *             This function takes a list item and returns the next
+ *             item on the list, or NULL if there are no more items on
+ *             the list. This function is used when iterating through
+ *             lists.
+ */
+void *
+list_item_next(void *item)
+{
+  return item == NULL? NULL: ((struct list *)item)->next;
+}
+/*---------------------------------------------------------------------------*/
 /** @} */

core/lib/list.h

@@ -64,7 +64,7 @@
  *
  * Author: Adam Dunkels <adam@sics.se>
  *
- * $Id: list.h,v 1.3 2009/05/06 15:07:35 adamdunkels Exp $
+ * $Id: list.h,v 1.4 2010/06/15 18:54:27 adamdunkels Exp $
  */
 #ifndef __LIST_H__
 #define __LIST_H__
@@ -113,6 +113,8 @@ void   list_copy(list_t dest, list_t src);
 
 void   list_insert(list_t list, void *previtem, void *newitem);
 
+void * list_item_next(void *item);
+
 #endif /* __LIST_H__ */
 
 /** @} */