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-exception
6 //
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
14 class LlvmLibcMemccpyTest : public LIBC_NAMESPACE::testing::Test {
15 public:
check_memccpy(LIBC_NAMESPACE::cpp::span<char> dst,const LIBC_NAMESPACE::cpp::span<const char> src,int end,size_t count,const LIBC_NAMESPACE::cpp::span<const char> expected,size_t expectedCopied,bool shouldReturnNull=false)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
TEST_F(LlvmLibcMemccpyTest,UntouchedUnrelatedEnd)40 TEST_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
TEST_F(LlvmLibcMemccpyTest,UntouchedStartsWithEnd)47 TEST_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
TEST_F(LlvmLibcMemccpyTest,CopyOneUnrelatedEnd)54 TEST_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
TEST_F(LlvmLibcMemccpyTest,CopyOneStartsWithEnd)61 TEST_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
TEST_F(LlvmLibcMemccpyTest,CopyTwoUnrelatedEnd)68 TEST_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
TEST_F(LlvmLibcMemccpyTest,CopyTwoStartsWithEnd)75 TEST_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