Function HandleReadCommand

Source/cmFileCommand.cxx:160–259

}

bool HandleReadCommand(std::vector<std::string> const& args,
                       cmExecutionStatus& status)
{
  if (args.size() < 3) {
    status.SetError("READ must be called with at least two additional "
                    "arguments");
    return false;
  }

  std::string const& fileNameArg = args[1];
  std::string const& variable = args[2];

  struct Arguments
  {
    std::string Offset;
    std::string Limit;
    bool Hex = false;
  };

  static auto const parser = cmArgumentParser<Arguments>{}
                               .Bind("OFFSET"_s, &Arguments::Offset)
                               .Bind("LIMIT"_s, &Arguments::Limit)
                               .Bind("HEX"_s, &Arguments::Hex);

  Arguments const arguments = parser.Parse(cmMakeRange(args).advance(3),
                                           /*unparsedArguments=*/nullptr);

  std::string fileName = fileNameArg;
  if (!cmsys::SystemTools::FileIsFullPath(fileName)) {
    fileName = cmStrCat(status.GetMakefile().GetCurrentSourceDirectory(), '/',
                        fileNameArg);
  }

// Open the specified file.
#if defined(_WIN32) || defined(__CYGWIN__)
  cmsys::ifstream file(fileName.c_str(),
                       arguments.Hex ? (std::ios::binary | std::ios::in)
                                     : std::ios::in);
#else
  cmsys::ifstream file(fileName.c_str());
#endif

  if (!file) {
    std::string error =
      cmStrCat("failed to open for reading (",
               cmSystemTools::GetLastSystemError(), "):\n  ", fileName);
    status.SetError(error);
    return false;
  }

  // is there a limit?
  std::string::size_type sizeLimit = std::string::npos;
  if (!arguments.Limit.empty()) {
    unsigned long long limit;
    if (cmStrToULongLong(arguments.Limit, &limit)) {
      sizeLimit = static_cast<std::string::size_type>(limit);
    }
  }