/*      $NetBSD: main.c,v 1.25 2021/05/02 12:50:43 rillig Exp $ */

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ed James.
 *
 * 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.
 */

/*
 * Copyright (c) 1987 by Ed James, UC Berkeley.  All rights reserved.
 *
 * Copy permission is hereby granted provided that this notice is
 * retained on all partial or complete copies.
 *
 * For more info on this and all of my stuff, mail edjames@berkeley.edu.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1990, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c      8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: main.c,v 1.25 2021/05/02 12:50:43 rillig Exp $");
#endif
#endif /* not lint */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <termios.h>
#include <getopt.h>
#include <err.h>

#include "pathnames.h"
#include "def.h"
#include "struct.h"
#include "extern.h"
#include "tunable.h"

extern FILE     *yyin;

static int read_file(const char *);
static const char *default_game(void);
static const char *okay_game(const char *);
static int list_games(void);
static void quit(int);

int
main(int argc, char *argv[])
{
        unsigned long           seed;
        int                     f_usage = 0, f_list = 0, f_showscore = 0;
        int                     f_printpath = 0;
        const char              *file = NULL;
        int                     ch;
        struct sigaction        sa;
#ifdef BSD
        struct itimerval        itv;
#endif

        /* Open the score file then revoke setgid privileges */
        open_score_file();
        (void)setgid(getgid());

        start_time = time(NULL);
        seed = start_time;

        while ((ch = getopt(argc, argv, ":u?lstpg:f:r:")) != -1) {
                switch (ch) {
                case '?':
                case 'u':
                default:
                        f_usage = 1;
                        break;
                case 'l':
                        f_list = 1;
                        break;
                case 's':
                case 't':
                        f_showscore = 1;
                        break;
                case 'p':
                        f_printpath = 1;
                        break;
                case 'r':
                        seed = atoi(optarg);
                        break;
                case 'f':
                case 'g':
                        file = optarg;
                        break;
                }
        }
        if (optind < argc)
                f_usage = 1;
        srandom(seed);

        if (f_usage)
                (void)fprintf(stderr,
                    "Usage: %s -[u?lstp] [-[gf] game_name] [-r random seed]\n",
                    argv[0]);
        if (f_showscore)
                (void)log_score(1);
        if (f_list)
                (void)list_games();
        if (f_printpath) {
                char    buf[100];

                (void)strlcpy(buf, _PATH_GAMES, 100);
                (void)puts(buf);
        }

        if (f_usage || f_showscore || f_list || f_printpath)
                exit(0);

        if (file == NULL)
                file = default_game();
        else
                file = okay_game(file);

        if (file == NULL || read_file(file) < 0)
                exit(1);

        init_gr();
        setup_screen(sp);

        addplane();

        (void)signal(SIGINT, quit);
        (void)signal(SIGQUIT, quit);
#ifdef BSD
        (void)signal(SIGTSTP, SIG_IGN);
#endif
        (void)signal(SIGHUP, log_score_quit);
        (void)signal(SIGTERM, log_score_quit);

        (void)tcgetattr(fileno(stdin), &tty_start);
        tty_new = tty_start;
        tty_new.c_lflag &= ~(ICANON|ECHO);
        tty_new.c_iflag |= ICRNL;
        tty_new.c_cc[VMIN] = 1;
        tty_new.c_cc[VTIME] = 0;
        (void)tcsetattr(fileno(stdin), TCSADRAIN, &tty_new);

        sa.sa_handler = update;
        (void)sigemptyset(&sa.sa_mask);
        (void)sigaddset(&sa.sa_mask, SIGALRM);
        (void)sigaddset(&sa.sa_mask, SIGINT);
        sa.sa_flags = 0;
        (void)sigaction(SIGALRM, &sa, (struct sigaction *)0);

#ifdef BSD
        itv.it_value.tv_sec = 0;
        itv.it_value.tv_usec = 1;
        itv.it_interval.tv_sec = sp->update_secs;
        itv.it_interval.tv_usec = 0;
        (void)setitimer(ITIMER_REAL, &itv, NULL);
#endif
#ifdef SYSV
        alarm(sp->update_secs);
#endif

        for (;;) {
                if (getcommand() != 1)
                        planewin();
                else {
#ifdef BSD
                        itv.it_value.tv_sec = 0;
                        itv.it_value.tv_usec = 0;
                        (void)setitimer(ITIMER_REAL, &itv, NULL);
#endif
#ifdef SYSV
                        alarm(0);
#endif

                        update(0);

#ifdef BSD
                        itv.it_value.tv_sec = sp->update_secs;
                        itv.it_value.tv_usec = 0;
                        itv.it_interval.tv_sec = sp->update_secs;
                        itv.it_interval.tv_usec = 0;
                        (void)setitimer(ITIMER_REAL, &itv, NULL);
#endif
#ifdef SYSV
                        alarm(sp->update_secs);
#endif
                }
        }
}

static int
read_file(const char *s)
{
        int             retval;

        filename = s;
        yyin = fopen(s, "r");
        if (yyin == NULL) {
                warn("fopen %s", s);
                return (-1);
        }
        retval = yyparse();
        (void)fclose(yyin);

        if (retval != 0)
                return (-1);
        else
                return (0);
}

static const char *
default_game(void)
{
        FILE            *fp;
        static char     file[256];
        char            line[256], games[256];

        (void)strlcpy(games, _PATH_GAMES, 256);
        (void)strlcat(games, GAMES, 256);

        if ((fp = fopen(games, "r")) == NULL) {
                warn("fopen %s", games);
                return (NULL);
        }
        if (fgets(line, sizeof(line), fp) == NULL) {
                (void)fprintf(stderr, "%s: no default game available\n", games);
                fclose(fp);
                return (NULL);
        }
        (void)fclose(fp);
        line[strlen(line) - 1] = '\0';
        (void)strlcpy(file, _PATH_GAMES, 256);
        (void)strlcat(file, line, 256);
        return (file);
}

static const char *
okay_game(const char *s)
{
        FILE            *fp;
        static char     file[256];
        const char      *ret = NULL;
        char            line[256], games[256];

        (void)strlcpy(games, _PATH_GAMES, 256);
        (void)strlcat(games, GAMES, 256);

        if ((fp = fopen(games, "r")) == NULL) {
                warn("fopen %s", games);
                return (NULL);
        }
        while (fgets(line, sizeof(line), fp) != NULL) {
                line[strlen(line) - 1] = '\0';
                if (strcmp(s, line) == 0) {
                        (void)strlcpy(file, _PATH_GAMES, 256);
                        (void)strlcat(file, line, 256);
                        ret = file;
                        break;
                }
        }
        (void)fclose(fp);
        if (ret == NULL) {
                test_mode = 1;
                ret = s;
                (void)fprintf(stderr, "%s: %s: game not found\n", games, s);
                (void)fprintf(stderr, "Your score will not be logged.\n");
                (void)sleep(2); /* give the guy time to read it */
        }
        return (ret);
}

static int
list_games(void)
{
        FILE            *fp;
        char            line[256], games[256];
        int             num_games = 0;

        (void)strlcpy(games, _PATH_GAMES, 256);
        (void)strlcat(games, GAMES, 256);

        if ((fp = fopen(games, "r")) == NULL) {
                warn("fopen %s", games);
                return (-1);
        }
        (void)puts("available games:");
        while (fgets(line, sizeof(line), fp) != NULL) {
                (void)printf("  %s", line);
                num_games++;
        }
        (void)fclose(fp);
        if (num_games == 0) {
                (void)fprintf(stderr, "%s: no games available\n", games);
                return (-1);
        }
        return (0);
}

/* ARGSUSED */
static void
quit(int dummy __unused)
{
        int c;
#ifdef BSD
        struct itimerval        itv;
#endif
        ioaskquit();
        c = getAChar();
        if (c == EOF || c == 'y') {
                /* disable timer */
#ifdef BSD
                itv.it_value.tv_sec = 0;
                itv.it_value.tv_usec = 0;
                (void)setitimer(ITIMER_REAL, &itv, NULL);
#endif
#ifdef SYSV
                alarm(0);
#endif
                shutdown_gr();
                (void)log_score(0);
                exit(0);
        }
        ionoquit();
}