-extern void dyn_string_copy PARAMS ((dyn_string_t, dyn_string_t));
-extern void dyn_string_copy_cstr PARAMS ((dyn_string_t, const char *));
-extern void dyn_string_prepend PARAMS ((dyn_string_t, dyn_string_t));
-extern void dyn_string_prepend_cstr PARAMS ((dyn_string_t, const char *));
-extern void dyn_string_insert PARAMS ((dyn_string_t, int,
+extern int dyn_string_copy PARAMS ((dyn_string_t, dyn_string_t));
+extern int dyn_string_copy_cstr PARAMS ((dyn_string_t, const char *));
+extern int dyn_string_prepend PARAMS ((dyn_string_t, dyn_string_t));
+extern int dyn_string_prepend_cstr PARAMS ((dyn_string_t, const char *));
+extern int dyn_string_insert PARAMS ((dyn_string_t, int,