[tor-commits] [tor/master] Fix "comparison is always false" warnings in new test_util_di_ops

[nickm at torproject.org]

commit d02937a20399a3b1c49a3503cabc5b07dc6b5e99
Author: Nick Mathewson <nickm at torproject.org>
Date:   Thu Sep 11 08:28:46 2014 -0400

    Fix "comparison is always false" warnings in new test_util_di_ops
    
    Having a constant zero means that unsigned < 0 is always false.
---
 src/test/test_util.c |   16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/test/test_util.c b/src/test/test_util.c
index e105435..09a27b7 100644
--- a/src/test/test_util.c
+++ b/src/test/test_util.c
@@ -3278,20 +3278,24 @@ test_util_di_ops(void)
    * against each possible (single-byte) bit difference
    * some arithmetic bugs only appear with certain bit patterns */
   {
-  const uint8_t z = 0;
+  uint8_t zz = 0;
   uint8_t ii = 0;
+  int z;
   for (i = 0; i < 256; i++) {
     ii = (uint8_t)i;
-    test_eq(tor_memeq(&z, &ii, 1), z == ii);
+    test_eq(tor_memeq(&zz, &ii, 1), zz == ii);
   }
 
   /* exhaustively white-box test tor_memcmp
    * against each possible single-byte numeric difference
    * some arithmetic bugs only appear with certain bit patterns */
-  for (i = 0; i < 256; i++) {
-    ii = (uint8_t)i;
-    test_eq(tor_memcmp(&z, &ii, 1) > 0 ? GT : EQ, z > ii ? GT : EQ);
-    test_eq(tor_memcmp(&ii, &z, 1) < 0 ? LT : EQ, ii < z ? LT : EQ);
+  for (z = 0; z < 256; z++) {
+    for (i = 0; i < 256; i++) {
+      ii = (uint8_t)i;
+      zz = (uint8_t)z;
+      test_eq(tor_memcmp(&zz, &ii, 1) > 0 ? GT : EQ, zz > ii ? GT : EQ);
+      test_eq(tor_memcmp(&ii, &zz, 1) < 0 ? LT : EQ, ii < zz ? LT : EQ);
+    }
   }
   }