/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

/*

 * Fuzzer for CMake's GCC dependency file parser

 *

 * GCC generates .d files with make-style dependencies.

 * This fuzzer tests parsing of these files.

 */

#include <cstddef>

#include <cstdint>

#include <cstdio>

#include <string>

#include <unistd.h>

#include "cmGccDepfileReader.h"

#include "cmSystemTools.h"

static constexpr size_t kMaxInputSize = 256 * 1024;

static std::string g_testDir;

extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv)

{

  (void)argc;

  (void)argv;

  char tmpl[] = "/tmp/cmake_fuzz_depfile_XXXXXX";

  char* dir = mkdtemp(tmpl);

  if (dir) {

    g_testDir = dir;

  } else {

    g_testDir = "/tmp/cmake_fuzz_depfile";

    cmSystemTools::MakeDirectory(g_testDir);

  }

  return 0;

}

extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)

{

  if (size == 0 || size > kMaxInputSize) {

    return 0;

  }

  // Write input to temp file

  std::string depFile = g_testDir + "/test.d";

  {

    FILE* fp = fopen(depFile.c_str(), "wb");

    if (!fp)

      return 0;

    fwrite(data, 1, size, fp);

    fclose(fp);

  }

  // Parse the depfile

  auto result = cmReadGccDepfile(depFile.c_str());

  // Examine results if parsing succeeded

  if (result) {

    for (auto const& entry : *result) {

      for (auto const& rule : entry.rules) {

        (void)rule;

      }

      for (auto const& path : entry.paths) {

        (void)path;

      }

    }

  }

  // Clean up

  unlink(depFile.c_str());

  return 0;

}