Function ParseGoogleTestFlagsOnlyImpl

tests/gtest/src/gtest.cc:6554–6603

// instantiated to either char or wchar_t.
template <typename CharType>
void ParseGoogleTestFlagsOnlyImpl(int* argc, CharType** argv) {
  for (int i = 1; i < *argc; i++) {
    const std::string arg_string = StreamableToString(argv[i]);
    const char* const arg = arg_string.c_str();

    using internal::ParseBoolFlag;
    using internal::ParseInt32Flag;
    using internal::ParseStringFlag;

    bool remove_flag = false;
    if (ParseGoogleTestFlag(arg)) {
      remove_flag = true;
#if GTEST_USE_OWN_FLAGFILE_FLAG_
    } else if (ParseStringFlag(arg, kFlagfileFlag, &GTEST_FLAG(flagfile))) {
      LoadFlagsFromFile(GTEST_FLAG(flagfile));
      remove_flag = true;
#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_
    } else if (arg_string == "--help" || arg_string == "-h" ||
               arg_string == "-?" || arg_string == "/?" ||
               HasGoogleTestFlagPrefix(arg)) {
      // Both help flag and unrecognized Google Test flags (excluding
      // internal ones) trigger help display.
      g_help_flag = true;
    }

    if (remove_flag) {
      // Shift the remainder of the argv list left by one.  Note
      // that argv has (*argc + 1) elements, the last one always being
      // NULL.  The following loop moves the trailing NULL element as
      // well.
      for (int j = i; j != *argc; j++) {
        argv[j] = argv[j + 1];
      }

      // Decrements the argument count.
      (*argc)--;

      // We also need to decrement the iterator as we just removed
      // an element.
      i--;
    }
  }

  if (g_help_flag) {
    // We print the help here instead of in RUN_ALL_TESTS(), as the
    // latter may not be called at all if the user is using Google
    // Test with another testing framework.
    PrintColorEncoded(kColorEncodedHelpMessage);
  }
}

// Parses the command line for Google Test flags, without initializing
// other parts of Google Test.