Add UUID, strlcpy, and their tests to util

util/stdlib/strlcpy_test.cc

+// 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/strlcpy.h"
+
+#include <string.h>
+
+#include <algorithm>
+
+#include "base/strings/string16.h"
+#include "base/strings/stringprintf.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+using namespace crashpad;
+
+TEST(strlcpy, c16lcpy) {
+  // Use a destination buffer that’s larger than the length passed to c16lcpy.
+  // The unused portion is a guard area that must not be written to.
+  struct TestBuffer {
+    char16 lead_guard[64];
+    char16 data[128];
+    char16 trail_guard[64];
+  };
+  TestBuffer expected_untouched;
+  memset(&expected_untouched, 0xa5, sizeof(expected_untouched));
+
+  // Test with M, é, Ā, ő, and Ḙ. This is a mix of characters that have zero and
+  // nonzero low and high bytes.
+  const char16 test_characters[] = {0x4d, 0xe9, 0x100, 0x151, 0x1e18};
+
+  for (size_t index = 0; index < arraysize(test_characters); ++index) {
+    char16 test_character = test_characters[index];
+    SCOPED_TRACE(base::StringPrintf(
+        "character index %zu, character 0x%x", index, test_character));
+    for (size_t length = 0; length < 256; ++length) {
+      SCOPED_TRACE(base::StringPrintf("index %zu", length));
+      string16 test_string(length, test_character);
+
+      TestBuffer destination;
+      memset(&destination, 0xa5, sizeof(destination));
+
+      EXPECT_EQ(length,
+                c16lcpy(destination.data,
+                        test_string.c_str(),
+                        arraysize(destination.data)));
+
+      // Make sure that the destination buffer is NUL-terminated, and that as
+      // much of the test string was copied as could fit.
+      size_t expected_destination_length =
+          std::min(length, arraysize(destination.data) - 1);
+
+      EXPECT_EQ('\0', destination.data[expected_destination_length]);
+      EXPECT_EQ(expected_destination_length, base::c16len(destination.data));
+      EXPECT_TRUE(base::c16memcmp(test_string.c_str(),
+                                  destination.data,
+                                  expected_destination_length) == 0);
+
+      // Make sure that the portion of the destination buffer that was not used
+      // was not touched. This includes the guard areas and the unused portion
+      // of the buffer passed to c16lcpy.
+      EXPECT_TRUE(base::c16memcmp(expected_untouched.lead_guard,
+                                  destination.lead_guard,
+                                  arraysize(destination.lead_guard)) == 0);
+      size_t expected_untouched_length =
+          arraysize(destination.data) - expected_destination_length - 1;
+      EXPECT_TRUE(
+          base::c16memcmp(expected_untouched.data,
+                          &destination.data[expected_destination_length + 1],
+                          expected_untouched_length) == 0);
+      EXPECT_TRUE(base::c16memcmp(expected_untouched.trail_guard,
+                                  destination.trail_guard,
+                                  arraysize(destination.trail_guard)) == 0);
+    }
+  }
+}
+
+}  // namespace