X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fuuid.c;h=620c039cb94318fce788ca15c320ee6c8994248f;hb=8f7501e83f4aa3d395287ef91f4910e32b55643e;hp=264d9bf5afb113f0dc1813d08ca9f90447a66c6f;hpb=d918d9d1128a98e4b2a398a501f541554fed3be8;p=openvswitch

diff --git a/lib/uuid.c b/lib/uuid.c
index 264d9bf5..620c039c 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2008, 2009 Nicira Networks
+/* Copyright (c) 2008, 2009, 2010 Nicira Networks
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -107,6 +107,14 @@ uuid_zero(struct uuid *uuid)
     uuid->parts[0] = uuid->parts[1] = uuid->parts[2] = uuid->parts[3] = 0;
 }
 
+/* Returns true if 'uuid' is all zero, otherwise false. */
+bool
+uuid_is_zero(const struct uuid *uuid)
+{
+    return (!uuid->parts[0] && !uuid->parts[1]
+            && !uuid->parts[2] && !uuid->parts[3]);
+}
+
 /* Compares 'a' and 'b'.  Returns a negative value if 'a < b', zero if 'a ==
  * b', or positive if 'a > b'.  The ordering is lexicographical order of the
  * conventional way of writing out UUIDs as strings. */