X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fsat-math.h;h=f4287fc250685d0320d8fbced9a1e716657dafcd;hb=1e3f34c7693bcabae8e443ac1b246680ef9b60e2;hp=cae956b5e9440b47ff59f2d140a7837512d34a77;hpb=a14bc59fb8f27db193d74662dc9c5cb8237177ef;p=sliver-openvswitch.git

diff --git a/lib/sat-math.h b/lib/sat-math.h
index cae956b5e..f4287fc25 100644
--- a/lib/sat-math.h
+++ b/lib/sat-math.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008 Nicira Networks.
+ * Copyright (c) 2008, 2012 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,13 +34,15 @@ sat_sub(unsigned int x, unsigned int y)
     return x >= y ? x - y : 0;
 }
 
-/* Saturating multiplication: overflow yields UINT_MAX. */
+/* Saturating multiplication of "unsigned int"s: overflow yields UINT_MAX. */
+#define SAT_MUL(X, Y)                                                   \
+    ((Y) == 0 ? 0                                                       \
+     : (X) <= UINT_MAX / (Y) ? (unsigned int) (X) * (unsigned int) (Y)  \
+     : UINT_MAX)
 static inline unsigned int
 sat_mul(unsigned int x, unsigned int y)
 {
-    return (!y ? 0
-            : x <= UINT_MAX / y ? x * y
-            : UINT_MAX);
+    return SAT_MUL(x, y);
 }
 
 #endif /* sat-math.h */