--- a/buf.h	Tue May 22 20:51:25 2012 +0200
+++ b/buf.h	Tue May 22 20:53:41 2012 +0200
@@ -35,14 +35,14 @@
 #  define _buf_at_printf(i1, i2)
 #endif
 
-enum {
+enum buf_flags {
 	BUF_AUTO	= 0,		/* string grows automatically */
 	BUF_FIXED	= (1 << 0),	/* fixed size string */
 	BUF_UNSAFE	= (1 << 1),	/* string may be truncated */
 };
 
 struct buf {
-	int		flags;		/* (ro) string flags */
+	enum buf_flags	flags;		/* (ro) string flags */
 	char		*text;		/* (ro) string text */
 	size_t		length;		/* (ro) string length */
 	size_t		alsize;		/* (ro) allocated size */