tetris/tetris.c

   1 /*      $NetBSD: tetris.c,v 1.31 2015/11/06 19:53:37 christos Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek and Darren F. Provine.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)tetris.c    8.1 (Berkeley) 5/31/93
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifndef lint
  39 __COPYRIGHT("@(#) Copyright (c) 1992, 1993\
  40  The Regents of the University of California.  All rights reserved.");
  41 #endif /* not lint */
  42
  43 /*
  44  * Tetris (or however it is spelled).
  45  */
  46
  47 #include <sys/time.h>
  48
  49 #include <err.h>
  50 #include <fcntl.h>
  51 #include <signal.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56
  57 #include "input.h"
  58 #include "scores.h"
  59 #include "screen.h"
  60 #include "tetris.h"
  61
  62 cell    board[B_SIZE];          /* 1 => occupied, 0 => empty */
  63
  64 int     Rows, Cols;             /* current screen size */
  65
  66 static const struct shape *curshape;
  67 const struct shape *nextshape;
  68
  69 long    fallrate;               /* less than 1 million; smaller => faster */
  70
  71 int     score;                  /* the obvious thing */
  72 gid_t   gid, egid;
  73
  74 char    key_msg[100];
  75 int     showpreview;
  76 int     nocolor;
  77
  78 static void elide(void);
  79 static void setup_board(void);
  80 static void onintr(int) __dead;
  81 static void usage(void) __dead;
  82
  83 /*
  84  * Set up the initial board.  The bottom display row is completely set,
  85  * along with another (hidden) row underneath that.  Also, the left and
  86  * right edges are set.
  87  */
  88 static void
  89 setup_board(void)
  90 {
  91         int i;
  92         cell *p;
  93
  94         p = board;
  95         for (i = B_SIZE; i; i--)
  96                 *p++ = (i <= (2 * B_COLS) || (i % B_COLS) < 2) ? 7 : 0;
  97 }
  98
  99 /*
 100  * Elide any full active rows.
 101  */
 102 static void
 103 elide(void)
 104 {
 105         int i, j, base;
 106         cell *p;
 107
 108         for (i = A_FIRST; i < A_LAST; i++) {
 109                 base = i * B_COLS + 1;
 110                 p = &board[base];
 111                 for (j = B_COLS - 2; *p++ != 0;) {
 112                         if (--j <= 0) {
 113                                 /* this row is to be elided */
 114                                 memset(&board[base], 0, B_COLS - 2);
 115                                 scr_update();
 116                                 tsleep();
 117                                 while (--base != 0)
 118                                         board[base + B_COLS] = board[base];
 119                                 /* don't forget to clear 0th row */
 120                                 memset(&board[1], 0, B_COLS - 2);
 121                                 scr_update();
 122                                 tsleep();
 123                                 break;
 124                         }
 125                 }
 126         }
 127 }
 128
 129 int
 130 main(int argc, char *argv[])
 131 {
 132         int pos, c;
 133         const char *keys;
 134         int level = 2;
 135 #define NUMKEYS 7
 136         char key_write[NUMKEYS][10];
 137         int ch, i, j;
 138         int fd;
 139
 140         gid = getgid();
 141         egid = getegid();
 142         setegid(gid);
 143
 144         fd = open("/dev/null", O_RDONLY);
 145         if (fd < 3)
 146                 exit(1);
 147         close(fd);
 148
 149         keys = "jkl pqn";
 150
 151         while ((ch = getopt(argc, argv, "bk:l:ps")) != -1)
 152                 switch(ch) {
 153                 case 'b':
 154                         nocolor = 1;
 155                         break;
 156                 case 'k':
 157                         if (strlen(keys = optarg) != NUMKEYS)
 158                                 usage();
 159                         break;
 160                 case 'l':
 161                         level = atoi(optarg);
 162                         if (level < MINLEVEL || level > MAXLEVEL) {
 163                                 errx(1, "level must be from %d to %d",
 164                                      MINLEVEL, MAXLEVEL);
 165                         }
 166                         break;
 167                 case 'p':
 168                         showpreview = 1;
 169                         break;
 170                 case 's':
 171                         showscores(0);
 172                         exit(0);
 173                 case '?':
 174                 default:
 175                         usage();
 176                 }
 177
 178         argc -= optind;
 179         argv += optind;
 180
 181         if (argc)
 182                 usage();
 183
 184         fallrate = 1000000 / level;
 185
 186         for (i = 0; i <= (NUMKEYS-1); i++) {
 187                 for (j = i+1; j <= (NUMKEYS-1); j++) {
 188                         if (keys[i] == keys[j]) {
 189                                 errx(1, "duplicate command keys specified.");
 190                         }
 191                 }
 192                 if (keys[i] == ' ')
 193                         strcpy(key_write[i], "<space>");
 194                 else {
 195                         key_write[i][0] = keys[i];
 196                         key_write[i][1] = '\0';
 197                 }
 198         }
 199
 200         snprintf(key_msg, sizeof(key_msg),
 201 "%s - left  %s - rotate  %s - right  %s - drop  %s - pause  %s - quit  %s - down",
 202                 key_write[0], key_write[1], key_write[2], key_write[3],
 203                 key_write[4], key_write[5], key_write[6]);
 204
 205         (void)signal(SIGINT, onintr);
 206         scr_init();
 207         setup_board();
 208
 209         srandom(getpid());
 210         scr_set();
 211
 212         pos = A_FIRST*B_COLS + (B_COLS/2)-1;
 213         nextshape = randshape();
 214         curshape = randshape();
 215
 216         scr_msg(key_msg, 1);
 217
 218         for (;;) {
 219                 place(curshape, pos, 1);
 220                 scr_update();
 221                 place(curshape, pos, 0);
 222                 c = tgetchar();
 223                 if (c < 0) {
 224                         /*
 225                          * Timeout.  Move down if possible.
 226                          */
 227                         if (fits_in(curshape, pos + B_COLS)) {
 228                                 pos += B_COLS;
 229                                 continue;
 230                         }
 231
 232                         /*
 233                          * Put up the current shape `permanently',
 234                          * bump score, and elide any full rows.
 235                          */
 236                         place(curshape, pos, 1);
 237                         score++;
 238                         elide();
 239
 240                         /*
 241                          * Choose a new shape.  If it does not fit,
 242                          * the game is over.
 243                          */
 244                         curshape = nextshape;
 245                         nextshape = randshape();
 246                         pos = A_FIRST*B_COLS + (B_COLS/2)-1;
 247                         if (!fits_in(curshape, pos))
 248                                 break;
 249                         continue;
 250                 }
 251
 252                 /*
 253                  * Handle command keys.
 254                  */
 255                 if (c == keys[5]) {
 256                         /* quit */
 257                         break;
 258                 }
 259                 if (c == keys[4]) {
 260                         static char msg[] =
 261                             "paused - press RETURN to continue";
 262
 263                         place(curshape, pos, 1);
 264                         do {
 265                                 scr_update();
 266                                 scr_msg(key_msg, 0);
 267                                 scr_msg(msg, 1);
 268                                 (void) fflush(stdout);
 269                         } while (rwait(NULL) == -1);
 270                         scr_msg(msg, 0);
 271                         scr_msg(key_msg, 1);
 272                         place(curshape, pos, 0);
 273                         continue;
 274                 }
 275                 if (c == keys[0]) {
 276                         /* move left */
 277                         if (fits_in(curshape, pos - 1))
 278                                 pos--;
 279                         continue;
 280                 }
 281                 if (c == keys[1]) {
 282                         /* turn */
 283                         const struct shape *new = &shapes[curshape->rot];
 284
 285                         if (fits_in(new, pos))
 286                                 curshape = new;
 287                         continue;
 288                 }
 289                 if (c == keys[2]) {
 290                         /* move right */
 291                         if (fits_in(curshape, pos + 1))
 292                                 pos++;
 293                         continue;
 294                 }
 295                 if (c == keys[3]) {
 296                         /* move to bottom */
 297                         while (fits_in(curshape, pos + B_COLS)) {
 298                                 pos += B_COLS;
 299                                 score++;
 300                         }
 301                         continue;
 302                 }
 303                 if (c == keys[6]) {
 304                         /* move down */
 305                         if (fits_in(curshape, pos + B_COLS)) {
 306                                 pos += B_COLS;
 307                                 score++;
 308                         }
 309                         continue;
 310                 }
 311                 if (c == '\f') {
 312                         scr_clear();
 313                         scr_msg(key_msg, 1);
 314                 }
 315         }
 316
 317         scr_clear();
 318         scr_end();
 319
 320         (void)printf("Your score:  %d point%s  x  level %d  =  %d\n",
 321             score, score == 1 ? "" : "s", level, score * level);
 322         savescore(level);
 323
 324         printf("\nHit RETURN to see high scores, ^C to skip.\n");
 325
 326         while ((i = getchar()) != '\n')
 327                 if (i == EOF)
 328                         break;
 329
 330         showscores(level);
 331
 332         exit(0);
 333 }
 334
 335 static void
 336 onintr(int signo __unused)
 337 {
 338         scr_clear();
 339         scr_end();
 340         exit(0);
 341 }
 342
 343 static void
 344 usage(void)
 345 {
 346         (void)fprintf(stderr, "usage: %s [-bps] [-k keys] [-l level]\n",
 347             getprogname());
 348         exit(1);
 349 }