Function get_this_executable_path

src/common/filesystem.cpp:94–125

std::string get_this_executable_path(std::string* filename,
                                    std::string* directory) {
  auto get_path = []() -> std::string{
#ifndef _WIN32
    char result[PATH_MAX];
    ssize_t num_read = readlink("/proc/self/exe", result, PATH_MAX);
    if (num_read >= 0 && num_read <= PATH_MAX - 1) {
      result[num_read] = '\0';
      return std::string{result};
    }
    return std::string{};
#else
    std::vector<char> path_buff;
    DWORD copied = 0;
    do {
      path_buff.resize(path_buff.size() + MAX_PATH);
      copied = GetModuleFileNameA(0, path_buff.data(), path_buff.size());
    } while (copied >= path_buff.size());

    path_buff.resize(copied);

    return std::string{path_buff.begin(), path_buff.end()};
#endif
  };

  std::string path = get_path();
  if(filename)
    *filename = path.empty() ? "" : fs::path{path}.filename().string();
  if(directory)
    *directory = path.empty() ? "" : fs::path{path}.parent_path().string();
  return path;
}

std::string join_path(const std::string& base, const std::string& extra) {
  return (fs::path(base) / extra).string();