lib: add listnode_add_force utility routine

that routine does the same as listnode_add; in addition it creates the
linked list if needed.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/linklist.c b/lib/linklist.c
index b8d9a47d2a..f0d0c29245 100644
--- a/lib/linklist.c
+++ b/lib/linklist.c
@@ -325,3 +325,10 @@ void list_sort(struct list *list, int (*cmp)(const void **, const void **))
 
 	XFREE(MTYPE_TMP, items);
 }
+
+void listnode_add_force(struct list **list, void *val)
+{
+	if (*list == NULL)
+		*list = list_new();
+	return listnode_add(*list, val);
+}