From ad1f130deb2637fe9f864b7a812932cfbf7f3f57 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Sun, 22 Nov 2020 19:06:42 +0100
Subject: [PATCH] tupperware: list: add 'empty' predicate

---
 include/tupperware/list.h | 1 +
 src/list.c                | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/tupperware/list.h b/include/tupperware/list.h
index 96a12ba..4b474c9 100644
--- a/include/tupperware/list.h
+++ b/include/tupperware/list.h
@@ -64,6 +64,7 @@ struct list_node *list_node_safe_detach(struct list_node **at);
 struct list_node *list_pop_front(struct list *list);
 struct list_node *list_pop_back(struct list *list);
 
+bool list_empty(const struct list *list);
 size_t list_length(const struct list *list);
 
 void list_node_concat(struct list_node *begin, struct list_node *end);
diff --git a/src/list.c b/src/list.c
index cbf1c02..c1c5670 100644
--- a/src/list.c
+++ b/src/list.c
@@ -108,6 +108,12 @@ struct list_node *list_pop_back(struct list *list) {
     return list_pop_front(list);
 }
 
+bool list_empty(const struct list *list) {
+    if (!list)
+        return true;
+    return list->head == NULL;
+}
+
 size_t list_length(const struct list *list) {
     if (!list || !list->head)
         return 0;