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