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-rw-r--r--src/libudev/def.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/libudev/def.h b/src/libudev/def.h
index 3c44e27121..d4844f4186 100644
--- a/src/libudev/def.h
+++ b/src/libudev/def.h
@@ -24,3 +24,8 @@
#include "util.h"
#define SYSTEMD_CGROUP_CONTROLLER "name=systemd"
+
+#define DIGITS "0123456789"
+#define LOWERCASE_LETTERS "abcdefghijklmnopqrstuvwxyz"
+#define UPPERCASE_LETTERS "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+#define LETTERS LOWERCASE_LETTERS UPPERCASE_LETTERS