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//===-- Unittests for memccpy ---------------------------------------------===//
//
// 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/CPP/span.h"
#include "src/string/memccpy.h"
#include "test/UnitTest/Test.h"
#include <stddef.h> // For size_t.
class LlvmLibcMemccpyTest : public __llvm_libc::testing::Test {
public:
void check_memccpy(__llvm_libc::cpp::span<char> dst,
const __llvm_libc::cpp::span<const char> src, int end,
size_t count,
const __llvm_libc::cpp::span<const char> expected,
size_t expectedCopied, bool shouldReturnNull = false) {
// Making sure we don't overflow buffer.
ASSERT_GE(dst.size(), count);
// Making sure memccpy returns dst.
void *result = __llvm_libc::memccpy(dst.data(), src.data(), end, count);
if (shouldReturnNull) {
ASSERT_EQ(result, static_cast<void *>(nullptr));
} else {
ASSERT_EQ(result, static_cast<void *>(dst.data() + expectedCopied));
}
// Expected must be of the same size as dst.
ASSERT_EQ(dst.size(), expected.size());
// Expected and dst are the same.
for (size_t i = 0; i < expected.size(); ++i)
ASSERT_EQ(expected[i], dst[i]);
}
};
TEST_F(LlvmLibcMemccpyTest, UntouchedUnrelatedEnd) {
char dst[] = {'a', 'b'};
const char src[] = {'x', '\0'};
const char expected[] = {'a', 'b'};
check_memccpy(dst, src, 'z', 0, expected, 0, true);
}
TEST_F(LlvmLibcMemccpyTest, UntouchedStartsWithEnd) {
char dst[] = {'a', 'b'};
const char src[] = {'x', '\0'};
const char expected[] = {'a', 'b'};
check_memccpy(dst, src, 'x', 0, expected, 0, true);
}
TEST_F(LlvmLibcMemccpyTest, CopyOneUnrelatedEnd) {
char dst[] = {'a', 'b'};
const char src[] = {'x', 'y'};
const char expected[] = {'x', 'b'};
check_memccpy(dst, src, 'z', 1, expected, 1, true);
}
TEST_F(LlvmLibcMemccpyTest, CopyOneStartsWithEnd) {
char dst[] = {'a', 'b'};
const char src[] = {'x', 'y'};
const char expected[] = {'x', 'b'};
check_memccpy(dst, src, 'x', 1, expected, 1);
}
TEST_F(LlvmLibcMemccpyTest, CopyTwoUnrelatedEnd) {
char dst[] = {'a', 'b'};
const char src[] = {'x', 'y'};
const char expected[] = {'x', 'y'};
check_memccpy(dst, src, 'z', 2, expected, 2, true);
}
TEST_F(LlvmLibcMemccpyTest, CopyTwoStartsWithEnd) {
char dst[] = {'a', 'b'};
const char src[] = {'x', 'y'};
const char expected[] = {'x', 'b'};
check_memccpy(dst, src, 'x', 2, expected, 1);
}
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