+/* Functions to classify characters according to cpp rules. */
+
+int macro_is_whitespace (int c);
+int macro_is_identifier_nondigit (int c);
+int macro_is_digit (int c);
+
+
+/* Stringify STR according to C rules and return an xmalloc'd pointer
+ to the result. */
+
+char *macro_stringify (const char *str);