/*      $NetBSD: teach.c,v 1.26 2024/08/22 20:46:40 rillig Exp $        */

/*
 * Copyright (c) 1980, 1993
 *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif                          /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)teach.c     8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: teach.c,v 1.26 2024/08/22 20:46:40 rillig Exp $");
#endif
#endif                          /* not lint */

#include "back.h"
#include "tutor.h"

static const char *const contin[] = {
        "",
        0
};

int
main(int argc __unused, char *argv[])
{
        int     i;
        struct move mmstore, *mm;

        /* revoke setgid privileges */
        setgid(getgid());

        signal(SIGINT, getout);
        if (tcgetattr(0, &old) == -1)   /* get old tty mode */
                errexit("teachgammon(gtty)");
        noech = old;
        noech.c_lflag &= ~ECHO;
        raw = noech;
        raw.c_lflag &= ~ICANON; /* set up modes */
        ospeed = cfgetospeed(&old);     /* for termlib */
        tflag = getcaps(getenv("TERM"));

        /* need this now beceause getarg() may try to load a game */
        mm = &mmstore;
        move_init(mm);
        while (*++argv != 0)
                getarg(mm, &argv);
        if (tflag) {
                noech.c_oflag &= ~(ONLCR | OXTABS);
                raw.c_oflag &= ~(ONLCR | OXTABS);
                clear();
        }
        wrtext(hello);
        wrtext(list);
        i = wrtext(contin);
        if (i == 0)
                i = 2;
        init();
        while (i)
                switch (i) {
                case 1:
                        leave();
                        /* NOTREACHED */

                case 2:
                        if ((i = wrtext(intro1)) != 0)
                                break;
                        wrboard();
                        if ((i = wrtext(intro2)) != 0)
                                break;

                        /* FALLTHROUGH */
                case 3:
                        if ((i = wrtext(moves)) != 0)
                                break;

                        /* FALLTHROUGH */
                case 4:
                        if ((i = wrtext(removepiece)) != 0)
                                break;

                        /* FALLTHROUGH */
                case 5:
                        if ((i = wrtext(hits)) != 0)
                                break;

                        /* FALLTHROUGH */
                case 6:
                        if ((i = wrtext(endgame)) != 0)
                                break;

                        /* FALLTHROUGH */
                case 7:
                        if ((i = wrtext(doubl)) != 0)
                                break;

                        /* FALLTHROUGH */
                case 8:
                        if ((i = wrtext(stragy)) != 0)
                                break;

                        /* FALLTHROUGH */
                case 9:
                        if ((i = wrtext(prog)) != 0)
                                break;

                        /* FALLTHROUGH */
                case 10:
                        if ((i = wrtext(lastch)) != 0)
                                break;
                }
        tutor(mm);
        /* NOTREACHED */
        return (0);
}

void
leave(void)
{
        if (tflag)
                clear();
        else
                writec('\n');
        fixtty(&old);
        execl(EXEC, "backgammon", "-n", args[0]?args:0, (char *) 0);
        writel("Help! Backgammon program is missing\007!!\n");
        exit(1);
}