const-qualify things which don't modify the list

diff --git a/src/lib/util/dlist.h b/src/lib/util/dlist.h
index 2d646a7ee071e5af6da76afed69f4980d882c553..ca1ce2baad4184f50d232adce48e05db3623a427 100644 (file)
--- a/src/lib/util/dlist.h
+++ b/src/lib/util/dlist.h
@@ -190,9 +190,9 @@ static inline CC_HINT(nonnull(1)) void fr_dlist_insert_tail(fr_dlist_head_t *lis
  *     - The HEAD item.
  *     - NULL if no items exist in the list.
  */
-static inline CC_HINT(nonnull) void *fr_dlist_head(fr_dlist_head_t *list_head)
+static inline CC_HINT(nonnull) void *fr_dlist_head(fr_dlist_head_t const *list_head)
 {
-       fr_dlist_t *head = &(list_head->entry);
+       fr_dlist_t const *head = &(list_head->entry);
 
        if (head->next == head) return NULL;
 
@@ -205,9 +205,9 @@ static inline CC_HINT(nonnull) void *fr_dlist_head(fr_dlist_head_t *list_head)
  *     - True if it does not.
  *     - False if it does.
  */
-static inline CC_HINT(nonnull) bool fr_dlist_empty(fr_dlist_head_t *list_head)
+static inline CC_HINT(nonnull) bool fr_dlist_empty(fr_dlist_head_t const *list_head)
 {
-       fr_dlist_t *head = &(list_head->entry);
+       fr_dlist_t const *head = &(list_head->entry);
 
        return (head->prev == head);
 }
@@ -219,9 +219,9 @@ static inline CC_HINT(nonnull) bool fr_dlist_empty(fr_dlist_head_t *list_head)
  *     - The TAIL item.
  *     - NULL if no items exist in the list.
  */
-static inline CC_HINT(nonnull) void *fr_dlist_tail(fr_dlist_head_t *list_head)
+static inline CC_HINT(nonnull) void *fr_dlist_tail(fr_dlist_head_t const *list_head)
 {
-       fr_dlist_t *head = &(list_head->entry);
+       fr_dlist_t const *head = &(list_head->entry);
 
        if (head->prev == head) return NULL;
 
@@ -242,10 +242,10 @@ static inline CC_HINT(nonnull) void *fr_dlist_tail(fr_dlist_head_t *list_head)
  *     - The head of the list if ptr is NULL.
  *     - NULL if ptr is the tail of the list (no more items).
  */
-static inline CC_HINT(nonnull(1)) void *fr_dlist_next(fr_dlist_head_t *list_head, void *ptr)
+static inline CC_HINT(nonnull(1)) void *fr_dlist_next(fr_dlist_head_t const *list_head, void *ptr)
 {
        fr_dlist_t *entry;
-       fr_dlist_t *head;
+       fr_dlist_t const *head;
 
        if (!ptr) return fr_dlist_head(list_head);