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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright Drew Noakes 2013-2016
#include "joystick.hpp"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <iostream>
#include <string>
#include <sstream>
#include "unistd.h"
void Joystick::init(int joystickNumber) {
std::stringstream sstm;
sstm << "/dev/input/js" << joystickNumber;
openPath(sstm.str(), false);
}
void Joystick::openPath(std::string devicePath, bool blocking)
{
// Open the device using either blocking or non-blocking
_fd = open(devicePath.c_str(), blocking ? O_RDONLY : O_RDONLY | O_NONBLOCK);
}
bool Joystick::sample(JoystickEvent* event)
{
int bytes = read(_fd, event, sizeof(*event));
if (bytes == -1)
return false;
// NOTE if this condition is not met, we're probably out of sync and this
// Joystick instance is likely unusable
return bytes == sizeof(*event);
}
bool Joystick::isFound()
{
return _fd >= 0;
}
Joystick::~Joystick()
{
close(_fd);
}
std::ostream& operator<<(std::ostream& os, const JoystickEvent& e)
{
os << "type=" << static_cast<int>(e.type)
<< " number=" << static_cast<int>(e.number)
<< " value=" << static_cast<int>(e.value);
return os;
}
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