-extern Lisp_Object interval_balance_threshold;
-
-extern INTERVAL create_root_interval ();
-extern void copy_properties ();
-extern int intervals_equal ();
-extern void traverse_intervals ();
-extern INTERVAL split_interval_right (), split_interval_left ();
-extern INLINE INTERVAL find_interval ();
-extern INTERVAL next_interval (), previous_interval ();
-extern INTERVAL merge_interval_left (), merge_interval_right ();
-extern void delete_interval ();
-extern INLINE void offset_intervals ();
-extern void graft_intervals_into_buffer ();
-extern void set_point ();
-extern INLINE void temp_set_point ();
-extern void verify_interval_modification ();
-extern INTERVAL balance_intervals ();
-extern INLINE void copy_intervals_to_string ();
-extern INTERVAL copy_intervals ();
-extern Lisp_Object textget ();
-extern Lisp_Object get_local_map ();
+extern INTERVAL create_root_interval P_ ((Lisp_Object));
+extern void copy_properties P_ ((INTERVAL, INTERVAL));
+extern int intervals_equal P_ ((INTERVAL, INTERVAL));
+extern void traverse_intervals P_ ((INTERVAL, int,
+ void (*) (INTERVAL, Lisp_Object),
+ Lisp_Object));
+extern void traverse_intervals_noorder P_ ((INTERVAL,
+ void (*) (INTERVAL, Lisp_Object),
+ Lisp_Object));
+extern INTERVAL split_interval_right P_ ((INTERVAL, int));
+extern INTERVAL split_interval_left P_ ((INTERVAL, int));
+extern INTERVAL find_interval P_ ((INTERVAL, int));
+extern INTERVAL next_interval P_ ((INTERVAL));
+extern INTERVAL previous_interval P_ ((INTERVAL));
+extern INTERVAL merge_interval_left P_ ((INTERVAL));
+extern INTERVAL merge_interval_right P_ ((INTERVAL));
+extern void delete_interval P_ ((INTERVAL));
+extern INLINE void offset_intervals P_ ((struct buffer *, int, int));
+extern void graft_intervals_into_buffer P_ ((INTERVAL, int, int,
+ struct buffer *, int));
+extern void set_point P_ ((struct buffer *, int));
+extern INLINE void temp_set_point P_ ((struct buffer *, int));
+extern void set_point_both P_ ((struct buffer *, int, int));
+extern INLINE void temp_set_point_both P_ ((struct buffer *, int, int));
+extern void verify_interval_modification P_ ((struct buffer *, int, int));
+extern INTERVAL balance_intervals P_ ((INTERVAL));
+extern INLINE void copy_intervals_to_string P_ ((Lisp_Object, struct buffer *,
+ int, int));
+extern INTERVAL copy_intervals P_ ((INTERVAL, int, int));
+extern int compare_string_intervals P_ ((Lisp_Object, Lisp_Object));
+extern Lisp_Object textget P_ ((Lisp_Object, Lisp_Object));
+extern Lisp_Object lookup_char_property P_ ((Lisp_Object, Lisp_Object, int));
+extern void move_if_not_intangible P_ ((int));
+extern int get_property_and_range P_ ((int, Lisp_Object, Lisp_Object *,
+ int *, int *, Lisp_Object));
+extern Lisp_Object get_local_map P_ ((int, struct buffer *, Lisp_Object));
+extern INTERVAL update_interval P_ ((INTERVAL, int));
+extern void set_intervals_multibyte P_ ((int));
+extern INTERVAL validate_interval_range P_ ((Lisp_Object, Lisp_Object *,
+ Lisp_Object *, int));
+
+/* Defined in xdisp.c */
+extern int invisible_p P_ ((Lisp_Object, Lisp_Object));