Method write_format

dependencies/httplib/httplib.h:1515–1546

template <typename... Args>
inline ssize_t Stream::write_format(const char *fmt, const Args &...args) {
  const auto bufsiz = 2048;
  std::array<char, bufsiz> buf{};

#if defined(_MSC_VER) && _MSC_VER < 1900
  auto sn = _snprintf_s(buf.data(), bufsiz, _TRUNCATE, fmt, args...);
#else
  auto sn = snprintf(buf.data(), buf.size() - 1, fmt, args...);
#endif
  if (sn <= 0) { return sn; }

  auto n = static_cast<size_t>(sn);

  if (n >= buf.size() - 1) {
    std::vector<char> glowable_buf(buf.size());

    while (n >= glowable_buf.size() - 1) {
      glowable_buf.resize(glowable_buf.size() * 2);
#if defined(_MSC_VER) && _MSC_VER < 1900
      n = static_cast<size_t>(_snprintf_s(&glowable_buf[0], glowable_buf.size(),
                                          glowable_buf.size() - 1, fmt,
                                          args...));
#else
      n = static_cast<size_t>(
          snprintf(&glowable_buf[0], glowable_buf.size() - 1, fmt, args...));
#endif
    }
    return write(&glowable_buf[0], n);
  } else {
    return write(buf.data(), n);
  }
}

inline void default_socket_options(socket_t sock) {
  int yes = 1;