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//===-- Unittests for strncmp ---------------------------------------------===//
//
// 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 "src/string/strncmp.h"
#include "test/UnitTest/Test.h"
// This group is just copies of the strcmp tests, since all the same cases still
// need to be tested.
TEST(LlvmLibcStrNCmpTest, EmptyStringsShouldReturnZeroWithSufficientLength) {
const char *s1 = "";
const char *s2 = "";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 1);
ASSERT_EQ(result, 0);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 1);
ASSERT_EQ(result, 0);
}
TEST(LlvmLibcStrNCmpTest,
EmptyStringShouldNotEqualNonEmptyStringWithSufficientLength) {
const char *empty = "";
const char *s2 = "abc";
int result = LIBC_NAMESPACE::strncmp(empty, s2, 3);
// This should be '\0' - 'a' = -97
ASSERT_EQ(result, -97);
// Similar case if empty string is second argument.
const char *s3 = "123";
result = LIBC_NAMESPACE::strncmp(s3, empty, 3);
// This should be '1' - '\0' = 49
ASSERT_EQ(result, 49);
}
TEST(LlvmLibcStrNCmpTest, EqualStringsShouldReturnZeroWithSufficientLength) {
const char *s1 = "abc";
const char *s2 = "abc";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 3);
ASSERT_EQ(result, 0);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 3);
ASSERT_EQ(result, 0);
}
TEST(LlvmLibcStrNCmpTest,
ShouldReturnResultOfFirstDifferenceWithSufficientLength) {
const char *s1 = "___B42__";
const char *s2 = "___C55__";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 8);
// This should return 'B' - 'C' = -1.
ASSERT_EQ(result, -1);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 8);
// This should return 'C' - 'B' = 1.
ASSERT_EQ(result, 1);
}
TEST(LlvmLibcStrNCmpTest,
CapitalizedLetterShouldNotBeEqualWithSufficientLength) {
const char *s1 = "abcd";
const char *s2 = "abCd";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 4);
// 'c' - 'C' = 32.
ASSERT_EQ(result, 32);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 4);
// 'C' - 'c' = -32.
ASSERT_EQ(result, -32);
}
TEST(LlvmLibcStrNCmpTest,
UnequalLengthStringsShouldNotReturnZeroWithSufficientLength) {
const char *s1 = "abc";
const char *s2 = "abcd";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 4);
// '\0' - 'd' = -100.
ASSERT_EQ(result, -100);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 4);
// 'd' - '\0' = 100.
ASSERT_EQ(result, 100);
}
TEST(LlvmLibcStrNCmpTest, StringArgumentSwapChangesSignWithSufficientLength) {
const char *a = "a";
const char *b = "b";
int result = LIBC_NAMESPACE::strncmp(b, a, 1);
// 'b' - 'a' = 1.
ASSERT_EQ(result, 1);
result = LIBC_NAMESPACE::strncmp(a, b, 1);
// 'a' - 'b' = -1.
ASSERT_EQ(result, -1);
}
// This group is actually testing strncmp functionality
TEST(LlvmLibcStrNCmpTest, NonEqualStringsEqualWithLengthZero) {
const char *s1 = "abc";
const char *s2 = "def";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 0);
ASSERT_EQ(result, 0);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 0);
ASSERT_EQ(result, 0);
}
TEST(LlvmLibcStrNCmpTest, NonEqualStringsNotEqualWithLengthOne) {
const char *s1 = "abc";
const char *s2 = "def";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 1);
ASSERT_EQ(result, -3);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 1);
ASSERT_EQ(result, 3);
}
TEST(LlvmLibcStrNCmpTest, NonEqualStringsEqualWithShorterLength) {
const char *s1 = "___B42__";
const char *s2 = "___C55__";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 3);
ASSERT_EQ(result, 0);
// This should return 'B' - 'C' = -1.
result = LIBC_NAMESPACE::strncmp(s1, s2, 4);
ASSERT_EQ(result, -1);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 3);
ASSERT_EQ(result, 0);
// This should return 'C' - 'B' = 1.
result = LIBC_NAMESPACE::strncmp(s2, s1, 4);
ASSERT_EQ(result, 1);
}
TEST(LlvmLibcStrNCmpTest, StringComparisonEndsOnNullByteEvenWithLongerLength) {
const char *s1 = "abc\0def";
const char *s2 = "abc\0abc";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 7);
ASSERT_EQ(result, 0);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 7);
ASSERT_EQ(result, 0);
}
TEST(LlvmLibcStrNCmpTest, Case) {
const char *s1 = "aB";
const char *s2 = "ab";
int result = LIBC_NAMESPACE::strncmp(s1, s2, 2);
ASSERT_LT(result, 0);
// Verify operands reversed.
result = LIBC_NAMESPACE::strncmp(s2, s1, 2);
ASSERT_GT(result, 0);
}
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