teach find_root_device to deal with /dev/ subdirs
(by "Kirill K. Smirnov" <lich@math.spbu.ru>)
diff --git a/include/libbb.h b/include/libbb.h
index 29ee8da..212b048 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -405,6 +405,7 @@
#define NOT_LONE_DASH(s) ((s)[0] != '-' || (s)[1])
#define LONE_CHAR(s,c) ((s)[0] == (c) && !(s)[1])
#define NOT_LONE_CHAR(s,c) ((s)[0] != (c) || (s)[1])
+#define DOT_OR_DOTDOT(s) ((s)[0] == '.' && (!(s)[1] || ((s)[1] == '.' && !(s)[2])))
/* dmalloc will redefine these to it's own implementation. It is safe
* to have the prototypes here unconditionally. */