libc/test/src/string/memcmp_test.cpp

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