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Diffstat (limited to 'lib/linklist.c')
-rw-r--r--lib/linklist.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/lib/linklist.c b/lib/linklist.c
index 983da2d1..a16e9e18 100644
--- a/lib/linklist.c
+++ b/lib/linklist.c
@@ -65,7 +65,9 @@ void
listnode_add (struct list *list, void *val)
{
struct listnode *node;
-
+
+ assert (val != NULL);
+
node = listnode_new ();
node->prev = list->tail;
@@ -91,7 +93,9 @@ listnode_add_sort (struct list *list, void *val)
{
struct listnode *n;
struct listnode *new;
-
+
+ assert (val != NULL);
+
new = listnode_new ();
new->data = val;
@@ -130,7 +134,9 @@ void
listnode_add_after (struct list *list, struct listnode *pp, void *val)
{
struct listnode *nn;
-
+
+ assert (val != NULL);
+
nn = listnode_new ();
nn->data = val;
@@ -266,7 +272,9 @@ void
list_add_node_prev (struct list *list, struct listnode *current, void *val)
{
struct listnode *node;
-
+
+ assert (val != NULL);
+
node = listnode_new ();
node->next = current;
node->data = val;
@@ -287,7 +295,9 @@ void
list_add_node_next (struct list *list, struct listnode *current, void *val)
{
struct listnode *node;
-
+
+ assert (val != NULL);
+
node = listnode_new ();
node->prev = current;
node->data = val;