81 lines · cpp
1//===-- Unittests for memccpy ---------------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/__support/CPP/span.h"10#include "src/string/memccpy.h"11#include "test/UnitTest/Test.h"12#include <stddef.h> // For size_t.13 14class LlvmLibcMemccpyTest : public LIBC_NAMESPACE::testing::Test {15public:16 void check_memccpy(LIBC_NAMESPACE::cpp::span<char> dst,17 const LIBC_NAMESPACE::cpp::span<const char> src, int end,18 size_t count,19 const LIBC_NAMESPACE::cpp::span<const char> expected,20 size_t expectedCopied, bool shouldReturnNull = false) {21 // Making sure we don't overflow buffer.22 ASSERT_GE(dst.size(), count);23 // Making sure memccpy returns dst.24 void *result = LIBC_NAMESPACE::memccpy(dst.data(), src.data(), end, count);25 26 if (shouldReturnNull) {27 ASSERT_EQ(result, static_cast<void *>(nullptr));28 } else {29 ASSERT_EQ(result, static_cast<void *>(dst.data() + expectedCopied));30 }31 32 // Expected must be of the same size as dst.33 ASSERT_EQ(dst.size(), expected.size());34 // Expected and dst are the same.35 for (size_t i = 0; i < expected.size(); ++i)36 ASSERT_EQ(expected[i], dst[i]);37 }38};39 40TEST_F(LlvmLibcMemccpyTest, UntouchedUnrelatedEnd) {41 char dst[] = {'a', 'b'};42 const char src[] = {'x', '\0'};43 const char expected[] = {'a', 'b'};44 check_memccpy(dst, src, 'z', 0, expected, 0, true);45}46 47TEST_F(LlvmLibcMemccpyTest, UntouchedStartsWithEnd) {48 char dst[] = {'a', 'b'};49 const char src[] = {'x', '\0'};50 const char expected[] = {'a', 'b'};51 check_memccpy(dst, src, 'x', 0, expected, 0, true);52}53 54TEST_F(LlvmLibcMemccpyTest, CopyOneUnrelatedEnd) {55 char dst[] = {'a', 'b'};56 const char src[] = {'x', 'y'};57 const char expected[] = {'x', 'b'};58 check_memccpy(dst, src, 'z', 1, expected, 1, true);59}60 61TEST_F(LlvmLibcMemccpyTest, CopyOneStartsWithEnd) {62 char dst[] = {'a', 'b'};63 const char src[] = {'x', 'y'};64 const char expected[] = {'x', 'b'};65 check_memccpy(dst, src, 'x', 1, expected, 1);66}67 68TEST_F(LlvmLibcMemccpyTest, CopyTwoUnrelatedEnd) {69 char dst[] = {'a', 'b'};70 const char src[] = {'x', 'y'};71 const char expected[] = {'x', 'y'};72 check_memccpy(dst, src, 'z', 2, expected, 2, true);73}74 75TEST_F(LlvmLibcMemccpyTest, CopyTwoStartsWithEnd) {76 char dst[] = {'a', 'b'};77 const char src[] = {'x', 'y'};78 const char expected[] = {'x', 'b'};79 check_memccpy(dst, src, 'x', 2, expected, 1);80}81