+#define _cpp_mark_macro_used(NODE) do { \
+ if ((NODE)->type == NT_MACRO && !((NODE)->flags & NODE_BUILTIN)) \
+ (NODE)->value.macro->used = 1; } while (0)
+
+/* A generic memory buffer, and operations on it. */
+typedef struct _cpp_buff _cpp_buff;
+struct _cpp_buff
+{
+ struct _cpp_buff *next;
+ unsigned char *base, *cur, *limit;
+};
+
+extern _cpp_buff *_cpp_get_buff PARAMS ((cpp_reader *, size_t));
+extern void _cpp_release_buff PARAMS ((cpp_reader *, _cpp_buff *));
+extern void _cpp_extend_buff PARAMS ((cpp_reader *, _cpp_buff **, size_t));
+extern _cpp_buff *_cpp_append_extend_buff PARAMS ((cpp_reader *, _cpp_buff *,
+ size_t));
+extern void _cpp_free_buff PARAMS ((_cpp_buff *));
+extern unsigned char *_cpp_aligned_alloc PARAMS ((cpp_reader *, size_t));
+extern unsigned char *_cpp_unaligned_alloc PARAMS ((cpp_reader *, size_t));
+
+#define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
+#define BUFF_FRONT(BUFF) ((BUFF)->cur)
+#define BUFF_LIMIT(BUFF) ((BUFF)->limit)
+