From fb3b5669cee85781b603f612228387e9a2e4120f Mon Sep 17 00:00:00 2001 From: Eduardo Lima Mitev Date: Fri, 23 Oct 2015 16:31:41 +0200 Subject: [PATCH] util: Add list_is_singular() helper function Returns whether the list has exactly one element. Reviewed-by: Matt Turner --- src/util/list.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/util/list.h b/src/util/list.h index b98ce59..066f9b8 100644 --- a/src/util/list.h +++ b/src/util/list.h @@ -99,6 +99,14 @@ static inline bool list_empty(struct list_head *list) return list->next == list; } +/** + * Returns whether the list has exactly one element. + */ +static inline bool list_is_singular(const struct list_head *list) +{ + return list->next != NULL && list->next->next == list; +} + static inline unsigned list_length(struct list_head *list) { struct list_head *node; -- 2.7.4