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-exception |
6 | // |
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 still |
13 | // need to be tested. |
14 | |
15 | TEST(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 | |
26 | TEST(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 | |
39 | TEST(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 | |
50 | TEST(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 | |
62 | TEST(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 | |
74 | TEST(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 | |
86 | TEST(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) && !defined(LIBC_HAS_SANITIZER) |
97 | TEST(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_HAS_ADDRESS_SANITIZER |
105 | |
106 | // This group is actually testing wcsncmp functionality |
107 | |
108 | TEST(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 | |
119 | TEST(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 | |
130 | TEST(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 | |
149 | TEST(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 | |
160 | TEST(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 | |