1//===-- Unittests for memcmp ----------------------------------------------===//
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 "hdr/signal_macros.h"
10#include "memory_utils/memory_check_utils.h"
11#include "src/__support/macros/config.h"
12#include "src/string/memcmp.h"
13#include "test/UnitTest/Test.h"
14#include "test/UnitTest/TestLogger.h"
15
16namespace LIBC_NAMESPACE_DECL {
17
18TEST(LlvmLibcMemcmpTest, CmpZeroByte) {
19 const char *lhs = "ab";
20 const char *rhs = "yz";
21 EXPECT_EQ(LIBC_NAMESPACE::memcmp(lhs, rhs, 0), 0);
22}
23
24TEST(LlvmLibcMemcmpTest, LhsRhsAreTheSame) {
25 const char *lhs = "ab";
26 const char *rhs = "ab";
27 EXPECT_EQ(LIBC_NAMESPACE::memcmp(lhs, rhs, 2), 0);
28}
29
30TEST(LlvmLibcMemcmpTest, LhsBeforeRhsLexically) {
31 const char *lhs = "ab";
32 const char *rhs = "az";
33 EXPECT_LT(LIBC_NAMESPACE::memcmp(lhs, rhs, 2), 0);
34}
35
36TEST(LlvmLibcMemcmpTest, LhsAfterRhsLexically) {
37 const char *lhs = "az";
38 const char *rhs = "ab";
39 EXPECT_GT(LIBC_NAMESPACE::memcmp(lhs, rhs, 2), 0);
40}
41
42TEST(LlvmLibcMemcmpTest, Issue77080) {
43 // https://github.com/llvm/llvm-project/issues/77080
44 constexpr char lhs[35] = "1.069cd68bbe76eb2143a3284d27ebe220";
45 constexpr char rhs[35] = "1.0500185b5d966a544e2d0fa40701b0f3";
46 ASSERT_GE(LIBC_NAMESPACE::memcmp(lhs, rhs, 34), 1);
47}
48
49// Adapt CheckMemcmp signature to memcmp.
50static inline int Adaptor(cpp::span<char> p1, cpp::span<char> p2, size_t size) {
51 return LIBC_NAMESPACE::memcmp(p1.begin(), p2.begin(), size);
52}
53
54TEST(LlvmLibcMemcmpTest, SizeSweep) {
55 static constexpr size_t kMaxSize = 400;
56 Buffer Buffer1(kMaxSize);
57 Buffer Buffer2(kMaxSize);
58 Randomize(Buffer1.span());
59 for (size_t size = 0; size < kMaxSize; ++size) {
60 auto span1 = Buffer1.span().subspan(0, size);
61 auto span2 = Buffer2.span().subspan(0, size);
62 const bool OK = CheckMemcmp<Adaptor>(span1, span2, size);
63 if (!OK)
64 testing::tlog << "Failed at size=" << size << '\n';
65 ASSERT_TRUE(OK);
66 }
67}
68
69#if defined(LIBC_ADD_NULL_CHECKS) && !defined(LIBC_HAS_SANITIZER)
70
71TEST(LlvmLibcMemcmpTest, CrashOnNullPtr) {
72 ASSERT_DEATH([]() { LIBC_NAMESPACE::memcmp(nullptr, nullptr, 1); },
73 WITH_SIGNAL(-1));
74}
75
76#endif // defined(LIBC_ADD_NULL_CHECKS) && !defined(LIBC_HAS_SANITIZER)
77
78} // namespace LIBC_NAMESPACE_DECL
79

source code of libc/test/src/string/memcmp_test.cpp