From 4440e3cdf7860a036836216ffa80a6ef82096901 Mon Sep 17 00:00:00 2001
From: Quentin Young <qlyoung@cumulusnetworks.com>
Date: Fri, 7 Dec 2018 22:06:42 +0000
Subject: [PATCH] lib: add list_to_array

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
---
 lib/linklist.c | 15 +++++++++++++++
 lib/linklist.h | 20 ++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/lib/linklist.c b/lib/linklist.c
index 40c4b27169..43bc709325 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 c30d8d314a..c2b289596d 100644
--- a/lib/linklist.h
+++ b/lib/linklist.h
@@ -239,6 +239,26 @@ extern struct list *list_dup(struct list *l);
 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.
  *
-- 
2.39.5