tetris.c

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/*      $OpenBSD: tetris.c,v 1.21 2006/04/20 03:24:12 ray Exp $ */
/*      $NetBSD: tetris.c,v 1.2 1995/04/22 07:42:47 cgd Exp $   */

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek and Darren F. Provine.
 *
 * 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.
 *
 *      @(#)tetris.c    8.1 (Berkeley) 5/31/93
 */

static const char copyright[] =
        "@(#) Copyright (c) 1992, 1993\n"
        "\tThe Regents of the University of California.  All rights reserved.\n";

#include <sys/time.h>
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <str.h>
#include <unistd.h>
#include <getopt.h>

#include "input.h"
#include "scores.h"
#include "screen.h"
#include "tetris.h"

cell board[B_SIZE];

int Rows;
int Cols;

const struct shape *curshape;
const struct shape *nextshape;

long fallrate;
int score;
char key_msg[100];
int showpreview;
int classic;

static void elide(void);
static void setup_board(void);
static const struct shape *randshape(void);

static void usage(void);

static int firstgame = 1;

/*
 * Set up the initial board. The bottom display row is completely set,
 * along with another (hidden) row underneath that. Also, the left and
 * right edges are set.
 */
static void setup_board(void)
{
        int i;
        cell *p = board;
        
        for (i = B_SIZE; i; i--)
                *p++ = (i <= (2 * B_COLS) || (i % B_COLS) < 2) ? 0x0000ff : 0x000000;
}

/*
 * Elide any full active rows.
 */
static void elide(void)
{
        int rows = 0;
        int i;
        int j;
        int base;
        cell *p;
        
        for (i = A_FIRST; i < A_LAST; i++) {
                base = i * B_COLS + 1;
                p = &board[base];
                for (j = B_COLS - 2; *p++ != 0;) {
                        if (--j <= 0) {
                                /* This row is to be elided */
                                rows++;
                                memset(&board[base], 0, sizeof(cell) * (B_COLS - 2));
                                
                                scr_update();
                                tsleep();
                                
                                while (--base != 0)
                                        board[base + B_COLS] = board[base];
                                
                                scr_update();
                                tsleep();
                                
                                break;
                        }
                }
        }
        
        switch (rows) {
        case 1:
                score += 10;
                break;
        case 2:
                score += 30;
                break;
        case 3:
                score += 70;
                break;
        case 4:
                score += 150;
                break;
        default:
                break;
        }
}

const struct shape *randshape(void)
{
        const struct shape *tmp = &shapes[random() % 7];
        int i;
        int j = random() % 4;
        
        for (i = 0; i < j; i++)
                tmp = &shapes[classic ? tmp->rotc : tmp->rot];
        
        return (tmp);
}

static void srandomdev(void)
{
        struct timeval tv;
        
        gettimeofday(&tv, NULL);
        srandom(tv.tv_sec + tv.tv_usec / 100000);
}

static void tetris_menu_draw(int level) 
{
        clear_screen();
        moveto(5, 10);
        puts("Tetris\n\n");
        
        moveto(8, 10);
        printf("Level = %d (press keys 1 - 9 to change)", level);
        moveto(9, 10);
        printf("Preview is %s (press 'p' to change)", (showpreview ? "on ": "off"));
        moveto(12, 10);
        printf("Press 'h' to show hiscore table.");
        moveto(13, 10);
        printf("Press 's' to start game.");
        moveto(14, 10);
        printf("Press 'q' to quit game.");
        moveto(20, 10);
        printf("In game controls:");
        moveto(21, 0);
        puts(key_msg);
}

static int tetris_menu(int *level)
{
        tetris_menu_draw(*level);
        while (1) {
                int i = getchar();
                
                switch(i) {
                        case 'p':
                                showpreview = !showpreview;
                                moveto(9, 21);
                                if (showpreview)
                                        printf("on ");
                                else
                                        printf("off");
                                break;
                        case 'h':
                                loadscores();
                                showscores(firstgame);
                                tetris_menu_draw(*level);
                                break;
                        case 's':
                                firstgame = 0;
                                return 1;
                        case 'q':
                                return 0;
                        case '1':
                        case '2':
                        case '3':
                        case '4':
                        case '5':
                        case '6':
                        case '7':
                        case '8':
                        case '9':
                                *level = i - '0';
                                moveto(8, 18);
                                printf("%d", *level);
                                break;
                }
        }
}

int main(int argc, char *argv[])
{
        int pos;
        int c;
        const char *keys;
        int level = 2;
        char key_write[6][10];
        int i;
        int j;
        int ch;
        
        keys = "jkl pq";
        
        classic = 0;
        showpreview = 1; 
        
        while ((ch = getopt(argc, argv, "ck:ps")) != -1)
                switch(ch) {
                case 'c':
                        /*
                         * this means:
                         *  - rotate the other way
                         *  - no reverse video
                         */
                        classic = 1;
                        break;
                case 'k':
                        if (str_size(keys = optarg) != 6)
                                usage();
                        break;
                case 'p':
                        showpreview = 1;
                        break;
                case 's':
                        showscores(0);
                        exit(0);
                default:
                        usage();
                }
        
        argc -= optind;
        argv += optind;
        
        if (argc)
                usage();
        
        for (i = 0; i <= 5; i++) {
                for (j = i + 1; j <= 5; j++) {
                        if (keys[i] == keys[j])
                                errx(1, "duplicate command keys specified.");
                }
                
                if (keys[i] == ' ')
                        str_cpy(key_write[i], sizeof(key_write[i]), "<space>");
                else {
                        key_write[i][0] = keys[i];
                        key_write[i][1] = '\0';
                }
        }
        
        snprintf(key_msg, sizeof(key_msg),
            "%s - left   %s - rotate   %s - right   %s - drop   %s - pause   %s - quit",
            key_write[0], key_write[1], key_write[2], key_write[3],
            key_write[4], key_write[5]);
        
        scr_init();
        if (loadscores() != EOK)
                initscores();

        while (tetris_menu(&level)) {
                fallrate = 1000000 / level;
                
                scr_clear();
                setup_board();
                
                srandomdev();
                scr_set();
                
                pos = A_FIRST * B_COLS + (B_COLS / 2) - 1;
                nextshape = randshape();
                curshape = randshape();
                
                scr_msg(key_msg, 1);
                
                while (1) {
                        place(curshape, pos, 1);
                        scr_update();
                        place(curshape, pos, 0);
                        c = tgetchar();
                        if (c < 0) {
                                /*
                                 * Timeout.  Move down if possible.
                                 */
                                if (fits_in(curshape, pos + B_COLS)) {
                                        pos += B_COLS;
                                        continue;
                                }
                                
                                /*
                                 * Put up the current shape `permanently',
                                 * bump score, and elide any full rows.
                                 */
                                place(curshape, pos, 1);
                                score++;
                                elide();
                                
                                /*
                                 * Choose a new shape.  If it does not fit,
                                 * the game is over.
                                 */
                                curshape = nextshape;
                                nextshape = randshape();
                                pos = A_FIRST * B_COLS + (B_COLS / 2) - 1;
                                
                                if (!fits_in(curshape, pos))
                                        break;
                                
                                continue;
                        }
                        
                        /*
                         * Handle command keys.
                         */
                        if (c == keys[5]) {
                                /* quit */
                                break;
                        }
                        
                        if (c == keys[4]) {
                                static char msg[] =
                                    "paused - press RETURN to continue";
                                
                                place(curshape, pos, 1);
                                do {
                                        scr_update();
                                        scr_msg(key_msg, 0);
                                        scr_msg(msg, 1);
                                        (void) fflush(stdout);
                                } while (rwait((struct timeval *) NULL) == -1);
                                
                                scr_msg(msg, 0);
                                scr_msg(key_msg, 1);
                                place(curshape, pos, 0);
                                continue;
                        }
                        
                        if (c == keys[0]) {
                                /* move left */
                                if (fits_in(curshape, pos - 1))
                                        pos--;
                                continue;
                        }
                        
                        if (c == keys[1]) {
                                /* turn */
                                const struct shape *new =
                                    &shapes[classic ? curshape->rotc : curshape->rot];
                                
                                if (fits_in(new, pos))
                                        curshape = new;
                                continue;
                        }
                        
                        if (c == keys[2]) {
                                /* move right */
                                if (fits_in(curshape, pos + 1))
                                        pos++;
                                continue;
                        }
                        
                        if (c == keys[3]) {
                                /* move to bottom */
                                while (fits_in(curshape, pos + B_COLS)) {
                                        pos += B_COLS;
                                        score++;
                                }
                                continue;
                        }
                        
                        if (c == '\f') {
                                scr_clear();
                                scr_msg(key_msg, 1);
                        }
                }
                
                scr_clear();
                loadscores();
                insertscore(score, level);
                savescores();
                score = 0;
        }
        
        scr_clear();
        printf("\nGame over.\n");
        scr_end();
        
        return 0;
}

void usage(void)
{
        fprintf(stderr, "usage: tetris [-ps] [-k keys]\n");
        exit(1);
}

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