Add strnlen() wrapper and its test

util/stdlib/strnlen_test.cc

Index: util/stdlib/strnlen_test.cc
diff --git a/util/stdlib/strnlen_test.cc b/util/stdlib/strnlen_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f5b6845bf0eaa2912e5837549283c129fce20386
--- /dev/null
+++ b/util/stdlib/strnlen_test.cc
@@ -0,0 +1,41 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/stdlib/strnlen.h"
+
+#include <string.h>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(strnlen, strnlen) {
+  const char kTestBuffer[] = "abc\0d";
+  ASSERT_EQ(3u, strlen(kTestBuffer));
+  EXPECT_EQ(0u, crashpad::strnlen(kTestBuffer, 0));
+  EXPECT_EQ(1u, crashpad::strnlen(kTestBuffer, 1));
+  EXPECT_EQ(2u, crashpad::strnlen(kTestBuffer, 2));
+  EXPECT_EQ(3u, crashpad::strnlen(kTestBuffer, 3));
+  EXPECT_EQ(3u, crashpad::strnlen(kTestBuffer, 4));
+  EXPECT_EQ(3u, crashpad::strnlen(kTestBuffer, 5));
+  EXPECT_EQ(3u, crashpad::strnlen(kTestBuffer, 6));
+
+  const char kEmptyBuffer[] = "\0";
+  ASSERT_EQ(0u, strlen(kEmptyBuffer));
+  EXPECT_EQ(0u, crashpad::strnlen(kEmptyBuffer, 0));
+  EXPECT_EQ(0u, crashpad::strnlen(kEmptyBuffer, 1));
+  EXPECT_EQ(0u, crashpad::strnlen(kEmptyBuffer, 2));
+}
+
+}  // namespace