[igt-dev] [PATCH i-g-t 3/7] igt_list: Add the igt_list_empty_or_null helper

[Ryszard Knop]

Checks if the list is empty or uninitialized.

Signed-off-by: Ryszard Knop <ryszard.knop at intel.com>
---
 lib/igt_list.c | 5 +++++
 lib/igt_list.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/lib/igt_list.c b/lib/igt_list.c
index 37ae139c..dc94fad8 100644
--- a/lib/igt_list.c
+++ b/lib/igt_list.c
@@ -81,3 +81,8 @@ bool igt_list_empty(const struct igt_list_head *head)
 {
 	return head->next == head;
 }
+
+bool igt_list_empty_or_null(const struct igt_list_head *head)
+{
+	return head->next == NULL || head->prev == NULL || igt_list_empty(head);
+}
diff --git a/lib/igt_list.h b/lib/igt_list.h
index be63fd80..4efb7a22 100644
--- a/lib/igt_list.h
+++ b/lib/igt_list.h
@@ -80,6 +80,7 @@ void igt_list_move(struct igt_list_head *elem, struct igt_list_head *list);
 void igt_list_move_tail(struct igt_list_head *elem, struct igt_list_head *list);
 int igt_list_length(const struct igt_list_head *head);
 bool igt_list_empty(const struct igt_list_head *head);
+bool igt_list_empty_or_null(const struct igt_list_head *head);
 
 #define igt_container_of(ptr, sample, member)				\
 	(__typeof__(sample))((char *)(ptr) -				\
-- 
2.36.1