Function is_dir

examples/server/httplib.h:2097–2100

}

inline bool is_dir(const std::string &path) {
  struct stat st;
  return stat(path.c_str(), &st) >= 0 && S_ISDIR(st.st_mode);
}

inline bool is_valid_path(const std::string &path) {
  size_t level = 0;