diff -r 54565fd74e74 -r 49d8cff6f0ee src/cx/linked_list.h
--- a/src/cx/linked_list.h	Sat Sep 28 15:47:28 2024 +0200
+++ b/src/cx/linked_list.h	Sat Sep 28 15:55:14 2024 +0200
@@ -104,12 +104,13 @@
  * @param index the search index
  * @return the node found at the specified index
  */
+__attribute__((__nonnull__))
 void *cx_linked_list_at(
         const void *start,
         size_t start_index,
         ptrdiff_t loc_advance,
         size_t index
-) __attribute__((__nonnull__));
+);
 
 /**
  * Finds the index of an element within a linked list.
@@ -121,13 +122,14 @@
  * @param elem a pointer to the element to find
  * @return the index of the element or a negative value if it could not be found
  */
+__attribute__((__nonnull__))
 ssize_t cx_linked_list_find(
         const void *start,
         ptrdiff_t loc_advance,
         ptrdiff_t loc_data,
         cx_compare_func cmp_func,
         const void *elem
-) __attribute__((__nonnull__));
+);
 
 /**
  * Finds the node containing an element within a linked list.
@@ -141,6 +143,7 @@
  * @param elem a pointer to the element to find
  * @return the index of the element or a negative value if it could not be found
  */
+__attribute__((__nonnull__))
 ssize_t cx_linked_list_find_node(
         void **result,
         const void *start,
@@ -148,7 +151,7 @@
         ptrdiff_t loc_data,
         cx_compare_func cmp_func,
         const void *elem
-) __attribute__((__nonnull__));
+);
 
 /**
  * Finds the first node in a linked list.
@@ -161,10 +164,11 @@
  * @param loc_prev the location of the \c prev pointer
  * @return a pointer to the first node
  */
+__attribute__((__nonnull__))
 void *cx_linked_list_first(
         const void *node,
         ptrdiff_t loc_prev
-) __attribute__((__nonnull__));
+);
 
 /**
  * Finds the last node in a linked list.
@@ -177,10 +181,11 @@
  * @param loc_next the location of the \c next pointer
  * @return a pointer to the last node
  */
+__attribute__((__nonnull__))
 void *cx_linked_list_last(
         const void *node,
         ptrdiff_t loc_next
-) __attribute__((__nonnull__));
+);
 
 /**
  * Finds the predecessor of a node in case it is not linked.
@@ -192,11 +197,12 @@
  * @param node the successor of the node to find
  * @return the node or \c NULL if \p node has no predecessor
  */
+__attribute__((__nonnull__))
 void *cx_linked_list_prev(
         const void *begin,
         ptrdiff_t loc_next,
         const void *node
-) __attribute__((__nonnull__));
+);
 
 /**
  * Adds a new node to a linked list.
@@ -210,13 +216,14 @@
  * @param loc_next the location of a \c next pointer within your node struct (required)
  * @param new_node a pointer to the node that shall be appended
  */
+__attribute__((__nonnull__(5)))
 void cx_linked_list_add(
         void **begin,
         void **end,
         ptrdiff_t loc_prev,
         ptrdiff_t loc_next,
         void *new_node
-) __attribute__((__nonnull__(5)));
+);
 
 /**
  * Prepends a new node to a linked list.
@@ -230,13 +237,14 @@
  * @param loc_next the location of a \c next pointer within your node struct (required)
  * @param new_node a pointer to the node that shall be prepended
  */
+__attribute__((__nonnull__(5)))
 void cx_linked_list_prepend(
         void **begin,
         void **end,
         ptrdiff_t loc_prev,
         ptrdiff_t loc_next,
         void *new_node
-) __attribute__((__nonnull__(5)));
+);
 
 /**
  * Links two nodes.
@@ -246,12 +254,13 @@
  * @param loc_prev the location of a \c prev pointer within your node struct (negative if your struct does not have one)
  * @param loc_next the location of a \c next pointer within your node struct (required)
  */
+__attribute__((__nonnull__))
 void cx_linked_list_link(
         void *left,
         void *right,
         ptrdiff_t loc_prev,
         ptrdiff_t loc_next
-) __attribute__((__nonnull__));
+);
 
 /**
  * Unlinks two nodes.
@@ -263,12 +272,13 @@
  * @param loc_prev the location of a \c prev pointer within your node struct (negative if your struct does not have one)
  * @param loc_next the location of a \c next pointer within your node struct (required)
  */
+__attribute__((__nonnull__))
 void cx_linked_list_unlink(
         void *left,
         void *right,
         ptrdiff_t loc_prev,
         ptrdiff_t loc_next
-) __attribute__((__nonnull__));
+);
 
 /**
  * Inserts a new node after a given node of a linked list.
@@ -284,6 +294,7 @@
  * @param node the node after which to insert (\c NULL if you want to prepend the node to the list)
  * @param new_node a pointer to the node that shall be inserted
  */
+__attribute__((__nonnull__(6)))
 void cx_linked_list_insert(
         void **begin,
         void **end,
@@ -291,7 +302,7 @@
         ptrdiff_t loc_next,
         void *node,
         void *new_node
-) __attribute__((__nonnull__(6)));
+);
 
 /**
  * Inserts a chain of nodes after a given node of a linked list.
@@ -313,6 +324,7 @@
  * @param insert_begin a pointer to the first node of the chain that shall be inserted
  * @param insert_end a pointer to the last node of the chain (or NULL if the last node shall be determined)
  */
+__attribute__((__nonnull__(6)))
 void cx_linked_list_insert_chain(
         void **begin,
         void **end,
@@ -321,7 +333,7 @@
         void *node,
         void *insert_begin,
         void *insert_end
-) __attribute__((__nonnull__(6)));
+);
 
 /**
  * Inserts a node into a sorted linked list.
@@ -337,6 +349,7 @@
  * @param new_node a pointer to the node that shall be inserted
  * @param cmp_func a compare function that will receive the node pointers
  */
+__attribute__((__nonnull__(1, 5, 6)))
 void cx_linked_list_insert_sorted(
         void **begin,
         void **end,
@@ -344,7 +357,7 @@
         ptrdiff_t loc_next,
         void *new_node,
         cx_compare_func cmp_func
-) __attribute__((__nonnull__(1, 5, 6)));
+);
 
 /**
  * Inserts a chain of nodes into a sorted linked list.
@@ -365,6 +378,7 @@
  * @param insert_begin a pointer to the first node of the chain that shall be inserted
  * @param cmp_func a compare function that will receive the node pointers
  */
+__attribute__((__nonnull__(1, 5, 6)))
 void cx_linked_list_insert_sorted_chain(
         void **begin,
         void **end,
@@ -372,7 +386,7 @@
         ptrdiff_t loc_next,
         void *insert_begin,
         cx_compare_func cmp_func
-)  __attribute__((__nonnull__(1, 5, 6)));
+);
 
 /**
  * Removes a node from the linked list.
@@ -393,13 +407,14 @@
  * @param loc_next the location of a \c next pointer within your node struct (required)
  * @param node the node to remove
  */
+__attribute__((__nonnull__(5)))
 void cx_linked_list_remove(
         void **begin,
         void **end,
         ptrdiff_t loc_prev,
         ptrdiff_t loc_next,
         void *node
-) __attribute__((__nonnull__(5)));
+);
 
 
 /**
@@ -435,6 +450,7 @@
  * @param loc_data the location of the \c data pointer within your node struct
  * @param cmp_func the compare function defining the sort order
  */
+__attribute__((__nonnull__(1, 6)))
 void cx_linked_list_sort(
         void **begin,
         void **end,
@@ -442,7 +458,7 @@
         ptrdiff_t loc_next,
         ptrdiff_t loc_data,
         cx_compare_func cmp_func
-) __attribute__((__nonnull__(1, 6)));
+);
 
 
 /**
@@ -458,13 +474,14 @@
  * @return the first non-zero result of invoking \p cmp_func or: negative if the left list is smaller than the
  * right list, positive if the left list is larger than the right list, zero if both lists are equal.
  */
+__attribute__((__nonnull__(5)))
 int cx_linked_list_compare(
         const void *begin_left,
         const void *begin_right,
         ptrdiff_t loc_advance,
         ptrdiff_t loc_data,
         cx_compare_func cmp_func
-) __attribute__((__nonnull__(5)));
+);
 
 /**
  * Reverses the order of the nodes in a linked list.
@@ -474,12 +491,13 @@
  * @param loc_prev the location of a \c prev pointer within your node struct (negative if your struct does not have one)
  * @param loc_next the location of a \c next pointer within your node struct (required)
  */
+__attribute__((__nonnull__(1)))
 void cx_linked_list_reverse(
         void **begin,
         void **end,
         ptrdiff_t loc_prev,
         ptrdiff_t loc_next
-) __attribute__((__nonnull__(1)));
+);
 
 #ifdef __cplusplus
 } // extern "C"