[libc-commits] [libc] [llvm] [libc] wcslcpy implementation (PR #146571)

[Michael Jones via libc-commits]

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@@ -0,0 +1,51 @@
+//===-- Unittests for wcslcpy ---------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "hdr/types/size_t.h"
+#include "hdr/types/wchar_t.h"
+#include "src/wchar/wcslcpy.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcWCSLCpyTest, BiggerSource) {
+  const wchar_t *src = L"abcde";
+  wchar_t dst[3];
+  size_t res = LIBC_NAMESPACE::wcslcpy(dst, src, 3);
+  ASSERT_TRUE(dst[0] == L'a');
+  ASSERT_TRUE(dst[1] == L'b');
+  // Should append null terminator
+  ASSERT_TRUE(dst[2] == L'\0');
+  // Should still return length of src
+  ASSERT_EQ(res, size_t(5));
+}
+
+TEST(LlvmLibcWCSLCpyTest, CopyZero) {
+  const wchar_t *src = L"abcde";
+  wchar_t dst = L'f';
+  // Copying zero should not change destination
+  size_t res = LIBC_NAMESPACE::wcslcpy(&dst, src, 0);
+  ASSERT_TRUE(dst == L'f');
+  // Should still return length of src
+  ASSERT_EQ(res, size_t(5));
+}
+
+TEST(LlvmLibcWCSLCpyTest, SmallerSource) {
+  const wchar_t *src = L"abc";
+  wchar_t dst[7]{L"111111"};
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michaelrj-google wrote:

nit: change this to `123456` or similar to make it more clear how many there are

https://github.com/llvm/llvm-project/pull/146571