/*
 * Wait and read single byte input from device.
 * $Id$
 * Copyright (c) 1997 by Tycho Softworks.
 * For conditions of distribution and reuse see product license.
 */
 
#include <dev/tty.h>
#include <std/select.h>
#include <std/poll.h>

#ifndef	SYS_POLL_H_MISSING
#define	USE_POLL
#endif

#ifndef	POLL_H_MISSING
#define	USE_POLL
#endif

#ifdef	USE_POLL

int	inkey(fd_t fd, int timeout)
{
	struct	pollfd	poller;
	uchar	buf;
	
	poller.fd = fd;
	poller.revents = 0;
	poller.events = POLLIN ;
	
	if(!poll(&poller, 1, timeout))
		return -1;
		
	if(poller.revents & (POLLERR | POLLHUP))
		return -1;
		
	if(read(fd, &buf, 1) != 1)
		return -1;
		
	return buf;
}
				
#else

int	inkey(fd_t fd, int timeout)
{
	fd_set	inp,out,exc;
	struct	timeval timer;
	uchar	buf;
	
	FD_ZERO(&inp);
	FD_ZERO(&out);
	FD_ZERO(&exc);
	
	FD_SET(fd, &inp);
	FD_SET(fd, &exc);
	
	timer.tv_sec = timeout / 1000;
	timer.tv_usec = timeout % 1000;
	
	if(!select(fd + 1, &inp, &out, &exc, &timer))
		return -1;
		
	if(FD_ISSET(fd, &exc))
			return -1;
			
	if(FD_ISSET(fd, &inp))
	{
		if(read(fd, &buf, 1) != 1)
			return -1;
			return buf;
	}
	return -1;
}

#endif