test/fuzzer/StrstrTest.cpp

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

// Test strstr and strcasestr hooks.
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <string.h>
#include <string>

// Windows does not have strcasestr and memmem, so we are not testing them.
#ifdef _WIN32
#define strcasestr strstr
#define memmem(a, b, c, d) true
#endif

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  if (Size < 4) return 0;
  std::string s(reinterpret_cast<const char*>(Data), Size);
  if (strstr(s.c_str(), "FUZZ") &&
      strcasestr(s.c_str(), "aBcD") &&
      memmem(s.data(), s.size(), "kuku", 4)
      ) {
    fprintf(stderr, "BINGO\n");
    exit(1);
  }
  return 0;
}