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//===-- Unittests for memmem ----------------------------------------------===//
//
// 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/__support/macros/config.h"
#include "src/string/memmem.h"
#include "test/UnitTest/Test.h"
#include "src/string/string_utils.h"
namespace LIBC_NAMESPACE_DECL {
TEST(LlvmLibcMemmemTest, EmptyHaystackEmptyNeedleReturnsHaystck) {
char *h = nullptr;
char *n = nullptr;
void *result = LIBC_NAMESPACE::memmem(h, 0, n, 0);
ASSERT_EQ(static_cast<char *>(result), h);
}
TEST(LlvmLibcMemmemTest, EmptyHaystackNonEmptyNeedleReturnsNull) {
char *h = nullptr;
char n[] = {'a', 'b', 'c'};
void *result = LIBC_NAMESPACE::memmem(h, 0, n, sizeof(n));
ASSERT_EQ(result, static_cast<void *>(nullptr));
}
TEST(LlvmLibcMemmemTest, EmptyNeedleReturnsHaystack) {
char h[] = {'a', 'b', 'c'};
char *n = nullptr;
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, 0);
ASSERT_EQ(static_cast<char *>(result), h + 0);
}
TEST(LlvmLibcMemmemTest, ExactMatchReturnsHaystack) {
char h[] = {'a', 'b', 'c'};
char n[] = {'a', 'b', 'c'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(static_cast<char *>(result), h + 0);
}
TEST(LlvmLibcMemmemTest, ReturnFirstMatchOfNeedle) {
char h[] = {'a', 'a', 'b', 'c'};
char n[] = {'a'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(static_cast<char *>(result), h + 0);
}
TEST(LlvmLibcMemmemTest, ReturnFirstExactMatchOfNeedle) {
{
char h[] = {'a', 'b', 'a', 'c', 'a', 'a'};
char n[] = {'a', 'a'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(static_cast<char *>(result), h + 4);
}
{
char h[] = {'a', 'a', 'b', 'a', 'b', 'a'};
char n[] = {'a', 'b', 'a'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(static_cast<char *>(result), h + 1);
}
}
TEST(LlvmLibcMemmemTest, NullTerminatorDoesNotInterruptMatch) {
char h[] = {'\0', 'a', 'b'};
char n[] = {'a', 'b'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(static_cast<char *>(result), h + 1);
}
TEST(LlvmLibcMemmemTest, ReturnNullIfNoExactMatch) {
{
char h[] = {'a'};
char n[] = {'a', 'a'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(result, static_cast<void *>(nullptr));
}
{
char h[] = {'a', 'A'};
char n[] = {'a', 'a'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(result, static_cast<void *>(nullptr));
}
{
char h[] = {'a'};
char n[] = {'a', '\0'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(result, static_cast<void *>(nullptr));
}
{
char h[] = {'\0'};
char n[] = {'\0', '\0'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, sizeof(n));
ASSERT_EQ(result, static_cast<void *>(nullptr));
}
}
TEST(LlvmLibcMemmemTest, ReturnMatchOfSpecifiedNeedleLength) {
{
char h[] = {'a', 'b', 'c'};
char n[] = {'x', 'y', 'z'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, 0);
ASSERT_EQ(static_cast<char *>(result), h + 0);
}
{
char h[] = {'a', 'b', 'c'};
char n[] = {'b', 'c', 'a'};
void *result = LIBC_NAMESPACE::memmem(h, sizeof(h), n, 2);
ASSERT_EQ(static_cast<char *>(result), h + 1);
}
}
TEST(LlvmLibcMemmemTest, ReturnNullIfInadequateHaystackLength) {
{
char h[] = {'a', 'b', 'c'};
char n[] = {'c'};
void *result = LIBC_NAMESPACE::memmem(h, 2, n, sizeof(n));
ASSERT_EQ(result, static_cast<void *>(nullptr));
}
{
char h[] = {'a', 'b', 'c'};
char n[] = {'a', 'b', 'c'};
void *result = LIBC_NAMESPACE::memmem(h, 2, n, sizeof(n));
ASSERT_EQ(result, static_cast<void *>(nullptr));
}
}
} // namespace LIBC_NAMESPACE_DECL
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