Function open_file

src/traffic_ctl/FileConfigCommand.cc:76–93

Function to open a file if it exists, if not and is requested we will create the file.

/// Function to open a file if it exists, if not and is requested we will create the file.
std::string
open_file(std::string const &filename, std::fstream &fs, std::ios_base::openmode mode = std::ios::in | std::ios::out,
          bool create = false)
{
  fs.open(filename, mode);

  if (!fs.is_open()) {
    if (create) {
      fs.clear();
      if (fs.open(filename, std::ios::out); fs.is_open()) {
        return {};
      }
    }
    std::string text;
    return swoc::bwprint(text, "We couldn't open '{}': {}", filename, strerror(errno));
  }
  return {};
}

/// Bunch of mapping flags for the TAGS.
std::string