Added search function

Implementation/linked_list.c

@@ -86,6 +86,13 @@ Node* list_get(Node* head, unsigned index)
 	return head;
 }
 
+Node* list_search(Node* head, void* elem, int (*eq)(void*, void*))
+{
+	while (head && !eq(elem, head->data))
+		head = head->next;
+	return head;
+}
+
 void list_remove(Node* node)
 {
 	if (node->prev)

Implementation/linked_list.h

@@ -17,4 +17,6 @@ void list_insert(Node* prev_node, void* data);
 
 Node* list_get(Node* head, unsigned index);
 
+Node* list_search(Node* head, void* elem, int (*eq)(void*, void*));
+
 void list_remove(Node* node);