From 75ff581de3ee58726f98b442560cbebaa60216e7 Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sun, 25 Dec 2016 15:55:48 -0800
Subject: [PATCH] Add clear function that clears the linked list.

---
 include/ll.h |  7 +++++++
 src/ll.c     | 11 +++++++++++
 2 files changed, 18 insertions(+)

diff --git a/include/ll.h b/include/ll.h
index fe27590..641ab8b 100644
--- a/include/ll.h
+++ b/include/ll.h
@@ -109,5 +109,12 @@ void* ll_pophead(ll* ll);
  */
 void* ll_poptail(ll* ll);
 
+/**
+ * Removes all elements from the list, freeing the underlying memory
+ * but keeping the data intact,
+ * @param ll the linked list to clear.
+ */
+void ll_clear(ll* ll);
+
 
 #endif
diff --git a/src/ll.c b/src/ll.c
index bbb0da1..599ec30 100644
--- a/src/ll.c
+++ b/src/ll.c
@@ -113,3 +113,14 @@ void* ll_poptail(ll* ll) {
   }
   return to_return;
 }
+
+void ll_clear(ll* ll){
+  ll_node* head = ll->head;
+  while(ll->head){
+    ll_node* to_free = head;
+    head = head->next;
+    free(to_free);
+  }
+  ll->head = NULL;
+  ll->tail = NULL;
+}