170 lines · cpp
1//===-- Unittests for wcsncmp ---------------------------------------------===//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 "src/wchar/wcsncmp.h"10#include "test/UnitTest/Test.h"11 12// This group is just copies of the wcscmp tests, since all the same cases still13// need to be tested.14 15TEST(LlvmLibcWcsncmpTest, EmptyStringsShouldReturnZeroWithSufficientLength) {16 const wchar_t *s1 = L"";17 const wchar_t *s2 = L"";18 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 1);19 ASSERT_EQ(result, 0);20 21 // Verify operands reversed.22 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 1);23 ASSERT_EQ(result, 0);24}25 26TEST(LlvmLibcWcsncmpTest,27 EmptyStringShouldNotEqualNonEmptyStringWithSufficientLength) {28 const wchar_t *empty = L"";29 const wchar_t *s2 = L"abc";30 int result = LIBC_NAMESPACE::wcsncmp(empty, s2, 3);31 ASSERT_LT(result, 0);32 33 // Similar case if empty string is second argument.34 const wchar_t *s3 = L"123";35 result = LIBC_NAMESPACE::wcsncmp(s3, empty, 3);36 ASSERT_GT(result, 0);37}38 39TEST(LlvmLibcWcsncmpTest, EqualStringsShouldReturnZeroWithSufficientLength) {40 const wchar_t *s1 = L"abc";41 const wchar_t *s2 = L"abc";42 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 3);43 ASSERT_EQ(result, 0);44 45 // Verify operands reversed.46 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 3);47 ASSERT_EQ(result, 0);48}49 50TEST(LlvmLibcWcsncmpTest,51 ShouldReturnResultOfFirstDifferenceWithSufficientLength) {52 const wchar_t *s1 = L"___B42__";53 const wchar_t *s2 = L"___C55__";54 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 8);55 ASSERT_LT(result, 0);56 57 // Verify operands reversed.58 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 8);59 ASSERT_GT(result, 0);60}61 62TEST(LlvmLibcWcsncmpTest,63 CapitalizedLetterShouldNotBeEqualWithSufficientLength) {64 const wchar_t *s1 = L"abcd";65 const wchar_t *s2 = L"abCd";66 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 4);67 ASSERT_GT(result, 0);68 69 // Verify operands reversed.70 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 4);71 ASSERT_LT(result, 0);72}73 74TEST(LlvmLibcWcsncmpTest,75 UnequalLengthStringsShouldNotReturnZeroWithSufficientLength) {76 const wchar_t *s1 = L"abc";77 const wchar_t *s2 = L"abcd";78 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 4);79 ASSERT_LT(result, 0);80 81 // Verify operands reversed.82 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 4);83 ASSERT_GT(result, 0);84}85 86TEST(LlvmLibcWcsncmpTest, StringArgumentSwapChangesSignWithSufficientLength) {87 const wchar_t *a = L"a";88 const wchar_t *b = L"b";89 int result = LIBC_NAMESPACE::wcsncmp(b, a, 1);90 ASSERT_GT(result, 0);91 92 result = LIBC_NAMESPACE::wcsncmp(a, b, 1);93 ASSERT_LT(result, 0);94}95 96#if defined(LIBC_ADD_NULL_CHECKS)97TEST(LlvmLibcWcsncmpTest, NullptrCrash) {98 // Passing in a nullptr should crash the program.99 EXPECT_DEATH([] { LIBC_NAMESPACE::wcsncmp(L"aaaaaaaaaaaaaa", nullptr, 3); },100 WITH_SIGNAL(-1));101 EXPECT_DEATH([] { LIBC_NAMESPACE::wcsncmp(nullptr, L"aaaaaaaaaaaaaa", 3); },102 WITH_SIGNAL(-1));103}104#endif // LIBC_ADD_NULL_CHECKS105 106// This group is actually testing wcsncmp functionality107 108TEST(LlvmLibcWcsncmpTest, NonEqualStringsEqualWithLengthZero) {109 const wchar_t *s1 = L"abc";110 const wchar_t *s2 = L"def";111 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 0);112 ASSERT_EQ(result, 0);113 114 // Verify operands reversed.115 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 0);116 ASSERT_EQ(result, 0);117}118 119TEST(LlvmLibcWcsncmpTest, NonEqualStringsNotEqualWithLengthOne) {120 const wchar_t *s1 = L"abc";121 const wchar_t *s2 = L"def";122 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 1);123 ASSERT_LT(result, 0);124 125 // Verify operands reversed.126 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 1);127 ASSERT_GT(result, 0);128}129 130TEST(LlvmLibcWcsncmpTest, NonEqualStringsEqualWithShorterLength) {131 const wchar_t *s1 = L"___B42__";132 const wchar_t *s2 = L"___C55__";133 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 3);134 ASSERT_EQ(result, 0);135 136 // This should return 'B' - 'C' = -1.137 result = LIBC_NAMESPACE::wcsncmp(s1, s2, 4);138 ASSERT_LT(result, 0);139 140 // Verify operands reversed.141 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 3);142 ASSERT_EQ(result, 0);143 144 // This should return 'C' - 'B' = 1.145 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 4);146 ASSERT_GT(result, 0);147}148 149TEST(LlvmLibcWcsncmpTest, StringComparisonEndsOnNullByteEvenWithLongerLength) {150 const wchar_t *s1 = L"abc\0def";151 const wchar_t *s2 = L"abc\0abc";152 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 7);153 ASSERT_EQ(result, 0);154 155 // Verify operands reversed.156 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 7);157 ASSERT_EQ(result, 0);158}159 160TEST(LlvmLibcWcsncmpTest, Case) {161 const wchar_t *s1 = L"aB";162 const wchar_t *s2 = L"ab";163 int result = LIBC_NAMESPACE::wcsncmp(s1, s2, 2);164 ASSERT_LT(result, 0);165 166 // Verify operands reversed.167 result = LIBC_NAMESPACE::wcsncmp(s2, s1, 2);168 ASSERT_GT(result, 0);169}170