1 //===-- Unittests for strncmp ---------------------------------------------===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 #include "test/UnitTest/Test.h"
15 TEST(LlvmLibcStrNCmpTest, EmptyStringsShouldReturnZeroWithSufficientLength) {  in TEST()  function
18   int result = LIBC_NAMESPACE::strncmp(s1, s2, 1);  in TEST()  local
19   ASSERT_EQ(result, 0);  in TEST()
22   result = LIBC_NAMESPACE::strncmp(s2, s1, 1);  in TEST()
23   ASSERT_EQ(result, 0);  in TEST()
26 TEST(LlvmLibcStrNCmpTest,  in TEST()  function
30   int result = LIBC_NAMESPACE::strncmp(empty, s2, 3);  in TEST()  local
31   // This should be '\0' - 'a' = -97  in TEST()
32   ASSERT_EQ(result, -97);  in TEST()
36   result = LIBC_NAMESPACE::strncmp(s3, empty, 3);  in TEST()
37   // This should be '1' - '\0' = 49  in TEST()
38   ASSERT_EQ(result, 49);  in TEST()
41 TEST(LlvmLibcStrNCmpTest, EqualStringsShouldReturnZeroWithSufficientLength) {  in TEST()  function
44   int result = LIBC_NAMESPACE::strncmp(s1, s2, 3);  in TEST()  local
45   ASSERT_EQ(result, 0);  in TEST()
48   result = LIBC_NAMESPACE::strncmp(s2, s1, 3);  in TEST()
49   ASSERT_EQ(result, 0);  in TEST()
52 TEST(LlvmLibcStrNCmpTest,  in TEST()  function
56   int result = LIBC_NAMESPACE::strncmp(s1, s2, 8);  in TEST()  local
57   // This should return 'B' - 'C' = -1.  in TEST()
58   ASSERT_EQ(result, -1);  in TEST()
61   result = LIBC_NAMESPACE::strncmp(s2, s1, 8);  in TEST()
62   // This should return 'C' - 'B' = 1.  in TEST()
63   ASSERT_EQ(result, 1);  in TEST()
66 TEST(LlvmLibcStrNCmpTest,  in TEST()  function
70   int result = LIBC_NAMESPACE::strncmp(s1, s2, 4);  in TEST()  local
71   // 'c' - 'C' = 32.  in TEST()
72   ASSERT_EQ(result, 32);  in TEST()
75   result = LIBC_NAMESPACE::strncmp(s2, s1, 4);  in TEST()
76   // 'C' - 'c' = -32.  in TEST()
77   ASSERT_EQ(result, -32);  in TEST()
80 TEST(LlvmLibcStrNCmpTest,  in TEST()  function
84   int result = LIBC_NAMESPACE::strncmp(s1, s2, 4);  in TEST()  local
85   // '\0' - 'd' = -100.  in TEST()
86   ASSERT_EQ(result, -100);  in TEST()
89   result = LIBC_NAMESPACE::strncmp(s2, s1, 4);  in TEST()
90   // 'd' - '\0' = 100.  in TEST()
91   ASSERT_EQ(result, 100);  in TEST()
94 TEST(LlvmLibcStrNCmpTest, StringArgumentSwapChangesSignWithSufficientLength) {  in TEST()  function
97   int result = LIBC_NAMESPACE::strncmp(b, a, 1);  in TEST()  local
98   // 'b' - 'a' = 1.  in TEST()
99   ASSERT_EQ(result, 1);  in TEST()
101   result = LIBC_NAMESPACE::strncmp(a, b, 1);  in TEST()
102   // 'a' - 'b' = -1.  in TEST()
103   ASSERT_EQ(result, -1);  in TEST()
108 TEST(LlvmLibcStrNCmpTest, NonEqualStringsEqualWithLengthZero) {  in TEST()  function
111   int result = LIBC_NAMESPACE::strncmp(s1, s2, 0);  in TEST()  local
112   ASSERT_EQ(result, 0);  in TEST()
115   result = LIBC_NAMESPACE::strncmp(s2, s1, 0);  in TEST()
116   ASSERT_EQ(result, 0);  in TEST()
119 TEST(LlvmLibcStrNCmpTest, NonEqualStringsNotEqualWithLengthOne) {  in TEST()  function
122   int result = LIBC_NAMESPACE::strncmp(s1, s2, 1);  in TEST()  local
123   ASSERT_EQ(result, -3);  in TEST()
126   result = LIBC_NAMESPACE::strncmp(s2, s1, 1);  in TEST()
127   ASSERT_EQ(result, 3);  in TEST()
130 TEST(LlvmLibcStrNCmpTest, NonEqualStringsEqualWithShorterLength) {  in TEST()  function
133   int result = LIBC_NAMESPACE::strncmp(s1, s2, 3);  in TEST()  local
134   ASSERT_EQ(result, 0);  in TEST()
136   // This should return 'B' - 'C' = -1.  in TEST()
137   result = LIBC_NAMESPACE::strncmp(s1, s2, 4);  in TEST()
138   ASSERT_EQ(result, -1);  in TEST()
141   result = LIBC_NAMESPACE::strncmp(s2, s1, 3);  in TEST()
142   ASSERT_EQ(result, 0);  in TEST()
144   // This should return 'C' - 'B' = 1.  in TEST()
145   result = LIBC_NAMESPACE::strncmp(s2, s1, 4);  in TEST()
146   ASSERT_EQ(result, 1);  in TEST()
149 TEST(LlvmLibcStrNCmpTest, StringComparisonEndsOnNullByteEvenWithLongerLength) {  in TEST()  function
152   int result = LIBC_NAMESPACE::strncmp(s1, s2, 7);  in TEST()  local
153   ASSERT_EQ(result, 0);  in TEST()
156   result = LIBC_NAMESPACE::strncmp(s2, s1, 7);  in TEST()
157   ASSERT_EQ(result, 0);  in TEST()
160 TEST(LlvmLibcStrNCmpTest, Case) {  in TEST()  function
163   int result = LIBC_NAMESPACE::strncmp(s1, s2, 2);  in TEST()  local
164   ASSERT_LT(result, 0);  in TEST()
167   result = LIBC_NAMESPACE::strncmp(s2, s1, 2);  in TEST()
168   ASSERT_GT(result, 0);  in TEST()