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1//===-- Unittests for wcsncpy ---------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "hdr/types/wchar_t.h"10#include "src/wchar/wcsncpy.h"11#include "test/UnitTest/Test.h"12 13TEST(LlvmLibcWCSNCpyTest, CopyZero) {14  // Dest should remain unchanged.15  wchar_t dest[3] = {L'a', L'b', L'\0'};16  const wchar_t *src = L"x";17  LIBC_NAMESPACE::wcsncpy(dest, src, 0);18  ASSERT_TRUE(dest[0] == L'a');19  ASSERT_TRUE(dest[1] == L'b');20  ASSERT_TRUE(dest[2] == L'\0');21}22 23TEST(LlvmLibcWCSNCpyTest, CopyFullIntoEmpty) {24  // Dest should be the exact same as src.25  wchar_t dest[15];26  const wchar_t *src = L"aaaaabbbbccccc";27  LIBC_NAMESPACE::wcsncpy(dest, src, 15);28  for (int i = 0; i < 15; i++)29    ASSERT_TRUE(dest[i] == src[i]);30}31 32TEST(LlvmLibcWCSNCpyTest, CopyPartial) {33  // First two characters of dest should be the first two characters of src.34  wchar_t dest[] = {L'a', L'b', L'c', L'd', L'\0'};35  const wchar_t *src = L"1234";36  LIBC_NAMESPACE::wcsncpy(dest, src, 2);37  ASSERT_TRUE(dest[0] == L'1');38  ASSERT_TRUE(dest[1] == L'2');39  ASSERT_TRUE(dest[2] == L'c');40  ASSERT_TRUE(dest[3] == L'd');41  ASSERT_TRUE(dest[4] == L'\0');42}43 44TEST(LlvmLibcWCSNCpyTest, CopyNullTerminator) {45  // Null terminator should copy into dest.46  wchar_t dest[] = {L'a', L'b', L'c', L'd', L'\0'};47  const wchar_t src[] = {L'\0', L'y'};48  LIBC_NAMESPACE::wcsncpy(dest, src, 1);49  ASSERT_TRUE(dest[0] == L'\0');50  ASSERT_TRUE(dest[1] == L'b');51  ASSERT_TRUE(dest[2] == L'c');52  ASSERT_TRUE(dest[3] == L'd');53  ASSERT_TRUE(dest[4] == L'\0');54}55 56TEST(LlvmLibcWCSNCpyTest, CopyPastSrc) {57  // Copying past src should fill with null terminator.58  wchar_t dest[] = {L'a', L'b', L'c', L'd', L'\0'};59  const wchar_t src[] = {L'x', L'\0'};60  LIBC_NAMESPACE::wcsncpy(dest, src, 4);61  ASSERT_TRUE(dest[0] == L'x');62  ASSERT_TRUE(dest[1] == L'\0');63  ASSERT_TRUE(dest[2] == L'\0');64  ASSERT_TRUE(dest[3] == L'\0');65  ASSERT_TRUE(dest[4] == L'\0');66}67