util/list: Make some helpers take const lists

They're all just querying things about the list and not mutating
anything.

Reviewed-by: Thomas Helland<thomashelland90@gmail.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

diff --git a/src/util/list.h b/src/util/list.h
index 6edb750110973ed42d926a60e1cf55299236b546..09d1b4cae64c2aef2db3e018cc5dc7ec10ac1769 100644 (file)
--- a/src/util/list.h
+++ b/src/util/list.h
@@ -72,7 +72,7 @@ static inline void list_addtail(struct list_head *item, struct list_head *list)
     list->prev = item;
 }
 
-static inline bool list_empty(struct list_head *list);
+static inline bool list_empty(const struct list_head *list);
 
 static inline void list_replace(struct list_head *from, struct list_head *to)
 {
@@ -101,7 +101,7 @@ static inline void list_delinit(struct list_head *item)
     item->prev = item;
 }
 
-static inline bool list_empty(struct list_head *list)
+static inline bool list_empty(const struct list_head *list)
 {
    return list->next == list;
 }
@@ -114,7 +114,7 @@ static inline bool list_is_singular(const struct list_head *list)
    return list->next != NULL && list->next != list && list->next->next == list;
 }
 
-static inline unsigned list_length(struct list_head *list)
+static inline unsigned list_length(const struct list_head *list)
 {
    struct list_head *node;
    unsigned length = 0;
@@ -145,7 +145,7 @@ static inline void list_splicetail(struct list_head *src, struct list_head *dst)
    dst->prev = src->prev;
 }
 
-static inline void list_validate(struct list_head *list)
+static inline void list_validate(const struct list_head *list)
 {
    struct list_head *node;
    assert(list->next->prev == list && list->prev->next == list);