-extern int find_composition (EMACS_INT, EMACS_INT, EMACS_INT *, EMACS_INT *,
- Lisp_Object *, Lisp_Object);
-extern void update_compositions (EMACS_INT, EMACS_INT, int);
+extern bool find_composition (ptrdiff_t, ptrdiff_t, ptrdiff_t *, ptrdiff_t *,
+ Lisp_Object *, Lisp_Object);
+extern void update_compositions (ptrdiff_t, ptrdiff_t, int);