lib: add list_to_array

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

2 files changed, 35 insertions, 0 deletions

diff --git a/lib/linklist.c b/lib/linklist.c
index 40c4b2716..43bc70932 100644
--- a/lib/linklist.c
+++ b/lib/linklist.c
@@ -334,3 +334,18 @@ struct listnode *listnode_add_force(struct list **list, void *val)
 		*list = list_new();
 	return listnode_add(*list, val);
 }
+
+void **list_to_array(struct list *list, void **arr, size_t arrlen)
+{
+	struct listnode *ln;
+	void *vp;
+	size_t idx = 0;
+
+	for (ALL_LIST_ELEMENTS_RO(list, ln, vp)) {
+		arr[idx++] = vp;
+		if (idx == arrlen)
+			break;
+	}
+
+	return arr;
+}
diff --git a/lib/linklist.h b/lib/linklist.h
index c30d8d314..c2b289596 100644
--- a/lib/linklist.h
+++ b/lib/linklist.h
@@ -240,6 +240,26 @@ extern void list_sort(struct list *list,
 		      int (*cmp)(const void **, const void **));
 
 /*
+ * Convert a list to an array of void pointers.
+ *
+ * Starts from the list head and ends either on the last node of the list or
+ * when the provided array cannot store any more elements.
+ *
+ * list
+ *    list to convert
+ *
+ * arr
+ *    Pre-allocated array of void *
+ *
+ * arrlen
+ *    Number of elements in arr
+ *
+ * Returns:
+ *    arr
+ */
+void **list_to_array(struct list *list, void **arr, size_t arrlen);
+
+/*
  * Delete a list and NULL its pointer.
  *
  * If non-null, list->del is called with each data element.