Anonymous

#include <stdio.h>
#include <sys/ioctl.h>
#include <linux/ppdev.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

/* 
 * Setbits.c <alarch@gmail.com>
 *
 * Program to open / close parallel port "data lines". In other words, to get 
 * voltage out from wanted pins.
 *
 * Borrowing some (well, 90% code from the Sochers' robot project.
 * 
 * ( http://www.linuxfocus.org/English/May2001/article205.shtml#205lfindex6 )
 *
 * 7.1.2005 | Under GPL
 * See http://www.gnu.org/copyleft/ for details.
 * 
 */

long bin2dec(char *s)
{
   long r=0;
   for (; *s; r = (r<<1) | (*s++ - '0'));
   return r;
}

int claim_port(char *dev)
{
	int fd;
	fd = open(dev, O_RDWR);
		if(fd < 0)
		{
			printf("Unable to open device\n");
			exit(1);
		}
	return fd;
}

int setport(int fd,int bits)
{
	int rc = ioctl(fd,PPWDATA,&bits);
	return rc;
}

int main(int argc, char *argv[])
{
	int fd = claim_port("/dev/parport0");
	int bincmd = bin2dec(argv[1]);
	//printf("%d",bincmd);
	setport(fd,bincmd);
	return 0;
}