pop_front() entfernt ein Element aus der Liste, muss aber nicht immer dessen Daten zurückgeben!

1 files changed, 4 insertions, 1 deletions

diff --git a/list-tail-node.c b/list-tail-node.c
index 52b93ce..c939b8d 100644
--- a/list-tail-node.c
+++ b/list-tail-node.c
@@ -75,7 +75,10 @@ list_pop_front(struct list *list, T *data)
 {
         if ( list->head != NULL ) {
                 struct list_node *next = list->head->next;
-                *data                  = list->head->data;
+
+                if ( data != NULL ) {
+                        *data = list->head->data;
+                }
                 free(list->head);
                 list->head = next;