1 /* $NetBSD: tetris.c,v 1.34 2023/07/01 10:51:35 nia 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 int Offset; /* used to center board & shapes */ 66 67 static const struct shape *curshape; 68 const struct shape *nextshape; 69 70 long fallrate; /* less than 1 million; smaller => faster */ 71 72 int score; /* the obvious thing */ 73 gid_t gid, egid; 74 75 char key_msg[100]; 76 int showpreview; 77 int nocolor; 78 79 static void elide(void); 80 static void setup_board(void); 81 static void onintr(int) __dead; 82 static void usage(void) __dead; 83 84 /* 85 * Set up the initial board. The bottom display row is completely set, 86 * along with another (hidden) row underneath that. Also, the left and 87 * right edges are set. 88 */ 89 static void 90 setup_board(void) 91 { 92 int i; 93 cell *p; 94 95 p = board; 96 for (i = B_SIZE; i; i--) 97 *p++ = (i <= (2 * B_COLS) || (i % B_COLS) < 2) ? 7 : 0; 98 } 99 100 /* 101 * Elide any full active rows. 102 */ 103 static void 104 elide(void) 105 { 106 int i, j, base; 107 cell *p; 108 109 for (i = A_FIRST; i < A_LAST; i++) { 110 base = i * B_COLS + 1; 111 p = &board[base]; 112 for (j = B_COLS - 2; *p++ != 0;) { 113 if (--j <= 0) { 114 /* this row is to be elided */ 115 memset(&board[base], 0, B_COLS - 2); 116 scr_update(); 117 tsleep(); 118 while (--base != 0) 119 board[base + B_COLS] = board[base]; 120 /* don't forget to clear 0th row */ 121 memset(&board[1], 0, B_COLS - 2); 122 scr_update(); 123 tsleep(); 124 break; 125 } 126 } 127 } 128 } 129 130 int 131 main(int argc, char *argv[]) 132 { 133 int pos, c; 134 const char *keys; 135 int level = 2; 136 #define NUMKEYS 7 137 char key_write[NUMKEYS][10]; 138 char *nocolor_env; 139 int ch, i, j; 140 int fd; 141 142 gid = getgid(); 143 egid = getegid(); 144 setegid(gid); 145 146 fd = open("/dev/null", O_RDONLY); 147 if (fd < 3) 148 exit(1); 149 close(fd); 150 151 keys = "jkl pqn"; 152 153 while ((ch = getopt(argc, argv, "bk:l:ps")) != -1) 154 switch(ch) { 155 case 'b': 156 nocolor = 1; 157 break; 158 case 'k': 159 if (strlen(keys = optarg) != NUMKEYS) 160 usage(); 161 break; 162 case 'l': 163 level = atoi(optarg); 164 if (level < MINLEVEL || level > MAXLEVEL) { 165 errx(1, "level must be from %d to %d", 166 MINLEVEL, MAXLEVEL); 167 } 168 break; 169 case 'p': 170 showpreview = 1; 171 break; 172 case 's': 173 showscores(0); 174 exit(0); 175 case '?': 176 default: 177 usage(); 178 } 179 180 argc -= optind; 181 argv += optind; 182 183 if (argc) 184 usage(); 185 186 nocolor_env = getenv("NO_COLOR"); 187 188 if (nocolor_env != NULL && nocolor_env[0] != '\0') 189 nocolor = 1; 190 191 fallrate = 1000000 / level; 192 193 for (i = 0; i <= (NUMKEYS-1); i++) { 194 for (j = i+1; j <= (NUMKEYS-1); j++) { 195 if (keys[i] == keys[j]) { 196 errx(1, "duplicate command keys specified."); 197 } 198 } 199 if (keys[i] == ' ') 200 strcpy(key_write[i], "<space>"); 201 else { 202 key_write[i][0] = keys[i]; 203 key_write[i][1] = '\0'; 204 } 205 } 206 207 snprintf(key_msg, sizeof(key_msg), 208 "%s - left %s - rotate %s - right %s - drop %s - pause %s - quit %s - down", 209 key_write[0], key_write[1], key_write[2], key_write[3], 210 key_write[4], key_write[5], key_write[6]); 211 212 (void)signal(SIGINT, onintr); 213 scr_init(); 214 setup_board(); 215 216 scr_set(); 217 218 pos = A_FIRST*B_COLS + (B_COLS/2)-1; 219 nextshape = randshape(); 220 curshape = randshape(); 221 222 scr_msg(key_msg, 1); 223 224 for (;;) { 225 place(curshape, pos, 1); 226 scr_update(); 227 place(curshape, pos, 0); 228 c = tgetchar(); 229 if (c < 0) { 230 /* 231 * Timeout. Move down if possible. 232 */ 233 if (fits_in(curshape, pos + B_COLS)) { 234 pos += B_COLS; 235 continue; 236 } 237 238 /* 239 * Put up the current shape `permanently', 240 * bump score, and elide any full rows. 241 */ 242 place(curshape, pos, 1); 243 score++; 244 elide(); 245 246 /* 247 * Choose a new shape. If it does not fit, 248 * the game is over. 249 */ 250 curshape = nextshape; 251 nextshape = randshape(); 252 pos = A_FIRST*B_COLS + (B_COLS/2)-1; 253 if (!fits_in(curshape, pos)) 254 break; 255 continue; 256 } 257 258 /* 259 * Handle command keys. 260 */ 261 if (c == keys[5]) { 262 /* quit */ 263 break; 264 } 265 if (c == keys[4]) { 266 static char msg[] = 267 "paused - press RETURN to continue"; 268 269 place(curshape, pos, 1); 270 do { 271 scr_update(); 272 scr_msg(key_msg, 0); 273 scr_msg(msg, 1); 274 (void) fflush(stdout); 275 } while (rwait(NULL) == -1); 276 scr_msg(msg, 0); 277 scr_msg(key_msg, 1); 278 place(curshape, pos, 0); 279 continue; 280 } 281 if (c == keys[0]) { 282 /* move left */ 283 if (fits_in(curshape, pos - 1)) 284 pos--; 285 continue; 286 } 287 if (c == keys[1]) { 288 /* turn */ 289 const struct shape *new = &shapes[curshape->rot]; 290 291 if (fits_in(new, pos)) 292 curshape = new; 293 continue; 294 } 295 if (c == keys[2]) { 296 /* move right */ 297 if (fits_in(curshape, pos + 1)) 298 pos++; 299 continue; 300 } 301 if (c == keys[3]) { 302 /* move to bottom */ 303 while (fits_in(curshape, pos + B_COLS)) { 304 pos += B_COLS; 305 score++; 306 } 307 continue; 308 } 309 if (c == keys[6]) { 310 /* move down */ 311 if (fits_in(curshape, pos + B_COLS)) { 312 pos += B_COLS; 313 score++; 314 } 315 continue; 316 } 317 if (c == '\f') { 318 scr_clear(); 319 scr_msg(key_msg, 1); 320 } 321 } 322 323 scr_clear(); 324 scr_end(); 325 326 (void)printf("Your score: %d point%s x level %d = %d\n", 327 score, score == 1 ? "" : "s", level, score * level); 328 savescore(level); 329 330 printf("\nHit RETURN to see high scores, ^C to skip.\n"); 331 332 while ((i = getchar()) != '\n') 333 if (i == EOF) 334 break; 335 336 showscores(level); 337 338 exit(0); 339 } 340 341 static void 342 onintr(int signo __unused) 343 { 344 scr_clear(); 345 scr_end(); 346 exit(0); 347 } 348 349 static void 350 usage(void) 351 { 352 (void)fprintf(stderr, "usage: %s [-bps] [-k keys] [-l level]\n", 353 getprogname()); 354 exit(1); 355 } 356