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/*-
 * Copyright (c) 1992 Christopher G. Demetriou
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/* comcontrol.c */

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


void usage(char *progname)
{
	fprintf(stderr, "usage: %s <filename> [[-]bidir]\n", progname);
	exit(1);
}

int main(int argc, char *argv[])
{
	int	fd;
	int	res;

	if ((argc < 2) || (argc > 3)) usage(argv[0]);

	fd = open(argv[1], O_RDONLY|O_NONBLOCK, 0);
	if (fd < 0) {
		fprintf(stderr, "%s: couldn't open file %s\n", argv[0], argv[1]);
		perror("open");
		exit(1);
	}

	if (argc == 2) {
		if (ioctl(fd, TIOCMGBIDIR, &res) < 0) {
			perror("ioctl");
			exit(1);
		}
		if (!res)  printf("-");
		printf("bidir\n");
	} else {
		if (!strcmp(argv[2],"bidir")) {
			res = 1;
		} else if (!strcmp(argv[2],"-bidir")) {
                        res = 0;
                } else {
			usage(argv[0]);
		}
		if (ioctl(fd, TIOCMSBIDIR, &res) < 0) {
                        perror("ioctl");
                        exit(1);
                }
	}

	close(fd);
}