/*
 * Copyright 2001-2013 Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *                              Daniel Reinhold, danielre@users.sf.net
 */


#include <stdio.h>
#include <unistd.h>

#include <OS.h>


void
usage()
{
        printf("Usage: tty [-s]\n"
               "Prints the file name for the terminal connected to standard input.\n"
               "  -s   silent mode: no output -- only return an exit status\n");

        exit(2);
}


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

        if (argc > 2)
                usage();

        else {
                bool silent = false;

                if (argc == 2) {
                        if (!strcmp(argv[1], "-s"))
                                silent = true;
                        else
                                usage();
                }

                if (!silent)
                        printf("%s\n", ttyname(STDIN_FILENO));
        }

        return (isatty(STDIN_FILENO) ? 0 : 1);
}