From: mike_m <mike_m@7cbeb6ba-43b4-40fd-8cce-4c39aea84d33>
Date: Thu, 13 Oct 2011 02:22:18 +0000 (+0000)
Subject: eina: Add eina_clist_element_is_linked()
X-Git-Tag: 2.0_alpha~57^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5c2367594417ec17ab64c27191533bcc21b9b5e3;p=framework%2Fuifw%2Feina.git

eina: Add eina_clist_element_is_linked()

Allows checking whether an entry is linked or not.

Signed-off-by: Mike McCormack <mj.mccormack@samsung.com>

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/eina@64029 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33
---

diff --git a/src/include/eina_clist.h b/src/include/eina_clist.h
index ffac398..ec8c476 100644
--- a/src/include/eina_clist.h
+++ b/src/include/eina_clist.h
@@ -34,6 +34,7 @@
  *  - O(N) time to calculate list length
  *  - requires one list entry in a struct per list (i.e. it's an inlist)
  *  - requires a head/tail pointer
+ *  - need to know the list head when moving to next or previous pointer
  *
  * Things to note:
  *  - there's no NULL at the end of the list, the last item points to the head
@@ -111,11 +112,25 @@ static inline void eina_clist_add_tail(Eina_Clist *list, Eina_Clist *elem)
    eina_clist_add_before(list, elem);
 }
 
+/* init an (unlinked) element */
+static inline void eina_clist_element_init(Eina_Clist *elem)
+{
+   elem->next = NULL;
+   elem->next = NULL;
+}
+
+/* check if an element is in a list or not */
+static inline int eina_clist_element_is_linked(Eina_Clist *elem)
+{
+   return (elem->next != NULL && elem->prev != NULL);
+}
+
 /* remove an element from its list */
 static inline void eina_clist_remove(Eina_Clist *elem)
 {
    elem->next->prev = elem->prev;
    elem->prev->next = elem->next;
+   eina_clist_element_init(elem);
 }
 
 /* get the next element */