/*
**  Xbox360 USB Gamepad Userspace Driver
**  Copyright (C) 2011 Ingo Ruhnke <grumbel@gmail.com>
**
**  This program is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "select.hpp"

#include <cerrno>
#include <cstring>
#include <stdexcept>

#include "raise_exception.hpp"

#pragma GCC diagnostic ignored "-Wold-style-cast"

Select::Select() : m_nfds(0), m_readfds() { FD_ZERO(&m_readfds); }

void Select::clear() {
  m_nfds = 0;
  FD_ZERO(&m_readfds);
}

void Select::add_fd(int fd) {
  FD_SET(fd, &m_readfds);
  m_nfds = std::max(m_nfds, fd);
}

bool Select::is_ready(int fd) const { return FD_ISSET(fd, &m_readfds); }

int Select::wait() {
  int ret = select(m_nfds + 1, &m_readfds, NULL /* writefds */,
                   NULL /* exceptfds */, NULL /* utimeout */);

  if (ret < 0) {
    raise_exception(std::runtime_error,
                    "select() call failed: " << strerror(errno));
  } else {
    // return number of fds that have data on them
    return ret;
  }
}

/* EOF */
