1 /* $NetBSD: screen.c,v 1.34 2021/05/02 12:50:46 rillig 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 * @(#)screen.c 8.1 (Berkeley) 5/31/93 35 */ 36 37 /* 38 * Tetris screen control. 39 */ 40 41 #include <sys/cdefs.h> 42 #include <sys/ioctl.h> 43 44 #include <setjmp.h> 45 #include <signal.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <term.h> 50 #include <termios.h> 51 #include <unistd.h> 52 53 #ifndef sigmask 54 #define sigmask(s) (1 << ((s) - 1)) 55 #endif 56 57 #include "screen.h" 58 #include "tetris.h" 59 60 static cell curscreen[B_SIZE]; /* 1 => standout (or otherwise marked) */ 61 static int curscore; 62 static int isset; /* true => terminal is in game mode */ 63 static struct termios oldtt; 64 static void (*tstp)(int); 65 66 static void scr_stop(int); 67 static void stopset(int) __dead; 68 69 70 /* 71 * Routine used by tputs(). 72 */ 73 int 74 put(int c) 75 { 76 77 return (putchar(c)); 78 } 79 80 /* 81 * putstr() is for unpadded strings (either as in termcap(5) or 82 * simply literal strings); putpad() is for padded strings with 83 * count=1. (See screen.h for putpad().) 84 */ 85 #define putstr(s) (void)fputs(s, stdout) 86 87 static void 88 moveto(int r, int c) 89 { 90 char *buf; 91 92 buf = tiparm(cursor_address, r, c); 93 if (buf != NULL) 94 putpad(buf); 95 } 96 97 static void 98 setcolor(int c) 99 { 100 char *buf; 101 char monochrome[] = "\033[0m"; 102 if (nocolor == 1) 103 return; 104 if (set_a_foreground == NULL) 105 return; 106 107 if (c == 0 || c == 7) 108 buf = monochrome; 109 else 110 buf = tiparm(set_a_foreground, c); 111 if (buf != NULL) 112 putpad(buf); 113 } 114 115 /* 116 * Set up from termcap. 117 */ 118 void 119 scr_init(void) 120 { 121 122 setupterm(NULL, 0, NULL); 123 if (clear_screen == NULL) 124 stop("cannot clear screen"); 125 if (cursor_address == NULL || cursor_up == NULL) 126 stop("cannot do random cursor positioning"); 127 } 128 129 /* this foolery is needed to modify tty state `atomically' */ 130 static jmp_buf scr_onstop; 131 132 static void 133 stopset(int sig) 134 { 135 sigset_t set; 136 137 (void) signal(sig, SIG_DFL); 138 (void) kill(getpid(), sig); 139 sigemptyset(&set); 140 sigaddset(&set, sig); 141 (void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0); 142 longjmp(scr_onstop, 1); 143 } 144 145 static void 146 scr_stop(int sig) 147 { 148 sigset_t set; 149 150 scr_end(); 151 (void) kill(getpid(), sig); 152 sigemptyset(&set); 153 sigaddset(&set, sig); 154 (void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0); 155 scr_set(); 156 scr_msg(key_msg, 1); 157 } 158 159 /* 160 * Set up screen mode. 161 */ 162 void 163 scr_set(void) 164 { 165 struct winsize ws; 166 struct termios newtt; 167 sigset_t nsigset, osigset; 168 void (*ttou)(int); 169 170 sigemptyset(&nsigset); 171 sigaddset(&nsigset, SIGTSTP); 172 sigaddset(&nsigset, SIGTTOU); 173 (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset); 174 if ((tstp = signal(SIGTSTP, stopset)) == SIG_IGN) 175 (void) signal(SIGTSTP, SIG_IGN); 176 if ((ttou = signal(SIGTTOU, stopset)) == SIG_IGN) 177 (void) signal(SIGTTOU, SIG_IGN); 178 /* 179 * At last, we are ready to modify the tty state. If 180 * we stop while at it, stopset() above will longjmp back 181 * to the setjmp here and we will start over. 182 */ 183 (void) setjmp(scr_onstop); 184 (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); 185 Rows = 0, Cols = 0; 186 if (ioctl(0, TIOCGWINSZ, &ws) == 0) { 187 Rows = ws.ws_row; 188 Cols = ws.ws_col; 189 } 190 if (Rows == 0) 191 Rows = lines; 192 if (Cols == 0) 193 Cols = columns; 194 if (Rows < MINROWS || Cols < MINCOLS) { 195 (void) fprintf(stderr, 196 "the screen is too small: must be at least %dx%d, ", 197 MINCOLS, MINROWS); 198 stop(""); /* stop() supplies \n */ 199 } 200 Offset = (Rows - D_LAST + D_FIRST - 2) / 2; 201 if (tcgetattr(0, &oldtt) < 0) 202 stop("tcgetattr() fails"); 203 newtt = oldtt; 204 newtt.c_lflag &= ~(ICANON|ECHO); 205 newtt.c_oflag &= ~OXTABS; 206 if (tcsetattr(0, TCSADRAIN, &newtt) < 0) 207 stop("tcsetattr() fails"); 208 ospeed = cfgetospeed(&newtt); 209 (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset); 210 211 /* 212 * We made it. We are now in screen mode, modulo TIstr 213 * (which we will fix immediately). 214 */ 215 const char *tstr; 216 if ((tstr = enter_ca_mode) != NULL) 217 putstr(tstr); 218 if ((tstr = cursor_invisible) != NULL) 219 putstr(tstr); 220 if (tstp != SIG_IGN) 221 (void) signal(SIGTSTP, scr_stop); 222 if (ttou != SIG_IGN) 223 (void) signal(SIGTTOU, ttou); 224 225 isset = 1; 226 (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); 227 scr_clear(); 228 } 229 230 /* 231 * End screen mode. 232 */ 233 void 234 scr_end(void) 235 { 236 sigset_t nsigset, osigset; 237 238 sigemptyset(&nsigset); 239 sigaddset(&nsigset, SIGTSTP); 240 sigaddset(&nsigset, SIGTTOU); 241 (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset); 242 /* move cursor to last line */ 243 const char *tstr; 244 if ((tstr = cursor_to_ll) != NULL) 245 putstr(tstr); 246 else 247 moveto(Rows - 1, 0); 248 /* exit screen mode */ 249 if ((tstr = exit_ca_mode) != NULL) 250 putstr(tstr); 251 if ((tstr = cursor_normal) != NULL) 252 putstr(tstr); 253 (void) fflush(stdout); 254 (void) tcsetattr(0, TCSADRAIN, &oldtt); 255 isset = 0; 256 /* restore signals */ 257 (void) signal(SIGTSTP, tstp); 258 (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); 259 } 260 261 void 262 stop(const char *why) 263 { 264 265 if (isset) 266 scr_end(); 267 (void) fprintf(stderr, "aborting: %s\n", why); 268 exit(1); 269 } 270 271 /* 272 * Clear the screen, forgetting the current contents in the process. 273 */ 274 void 275 scr_clear(void) 276 { 277 278 putpad(clear_screen); 279 curscore = -1; 280 memset((char *)curscreen, 0, sizeof(curscreen)); 281 } 282 283 #if vax && !__GNUC__ 284 typedef int regcell; /* pcc is bad at `register char', etc */ 285 #else 286 typedef cell regcell; 287 #endif 288 289 /* 290 * Update the screen. 291 */ 292 void 293 scr_update(void) 294 { 295 cell *bp, *sp; 296 regcell so, cur_so = 0; 297 int i, ccol, j; 298 sigset_t nsigset, osigset; 299 static const struct shape *lastshape; 300 301 sigemptyset(&nsigset); 302 sigaddset(&nsigset, SIGTSTP); 303 (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset); 304 305 /* always leave cursor after last displayed point */ 306 curscreen[D_LAST * B_COLS - 1] = -1; 307 308 if (score != curscore) { 309 if (cursor_home) 310 putpad(cursor_home); 311 else 312 moveto(0, 0); 313 setcolor(0); 314 (void) printf("Score: %d", score); 315 curscore = score; 316 } 317 318 /* draw preview of nextpattern */ 319 if (showpreview && (nextshape != lastshape)) { 320 static int r=5, c=2; 321 int tr, tc, t; 322 323 lastshape = nextshape; 324 325 /* clean */ 326 putpad(exit_standout_mode); 327 moveto(r-1, c-1); putstr(" "); 328 moveto(r, c-1); putstr(" "); 329 moveto(r+1, c-1); putstr(" "); 330 moveto(r+2, c-1); putstr(" "); 331 332 moveto(r-3, c-2); 333 putstr("Next shape:"); 334 335 /* draw */ 336 setcolor(nextshape->color); 337 putpad(enter_standout_mode); 338 moveto(r, 2*c); 339 putstr(" "); 340 for(i=0; i<3; i++) { 341 t = c + r*B_COLS; 342 t += nextshape->off[i]; 343 344 tr = t / B_COLS; 345 tc = t % B_COLS; 346 347 moveto(tr, 2*tc); 348 putstr(" "); 349 } 350 putpad(exit_standout_mode); 351 } 352 353 bp = &board[D_FIRST * B_COLS]; 354 sp = &curscreen[D_FIRST * B_COLS]; 355 for (j = D_FIRST; j < D_LAST; j++) { 356 ccol = -1; 357 for (i = 0; i < B_COLS; bp++, sp++, i++) { 358 if (*sp == (so = *bp)) 359 continue; 360 *sp = so; 361 if (i != ccol) { 362 if (cur_so && move_standout_mode) { 363 putpad(exit_standout_mode); 364 cur_so = 0; 365 } 366 moveto(RTOD(j + Offset), CTOD(i)); 367 } 368 if (enter_standout_mode) { 369 if (so != cur_so) { 370 setcolor(so); 371 putpad(so ? 372 enter_standout_mode : 373 exit_standout_mode); 374 cur_so = so; 375 } 376 #ifdef DEBUG 377 char buf[3]; 378 snprintf(buf, sizeof(buf), "%d%d", so, so); 379 putstr(buf); 380 #else 381 putstr(" "); 382 #endif 383 } else 384 putstr(so ? "XX" : " "); 385 ccol = i + 1; 386 /* 387 * Look ahead a bit, to avoid extra motion if 388 * we will be redrawing the cell after the next. 389 * Motion probably takes four or more characters, 390 * so we save even if we rewrite two cells 391 * `unnecessarily'. Skip it all, though, if 392 * the next cell is a different color. 393 */ 394 #define STOP (B_COLS - 3) 395 if (i > STOP || sp[1] != bp[1] || so != bp[1]) 396 continue; 397 if (sp[2] != bp[2]) 398 sp[1] = -1; 399 else if (i < STOP && so == bp[2] && sp[3] != bp[3]) { 400 sp[2] = -1; 401 sp[1] = -1; 402 } 403 } 404 } 405 if (cur_so) 406 putpad(exit_standout_mode); 407 (void) fflush(stdout); 408 (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); 409 } 410 411 /* 412 * Write a message (set!=0), or clear the same message (set==0). 413 * (We need its length in case we have to overwrite with blanks.) 414 */ 415 void 416 scr_msg(char *s, int set) 417 { 418 419 if (set || clr_eol == NULL) { 420 int l = strlen(s); 421 422 moveto(Rows - 2, ((Cols - l) >> 1) - 1); 423 if (set) 424 putstr(s); 425 else 426 while (--l >= 0) 427 (void) putchar(' '); 428 } else { 429 moveto(Rows - 2, 0); 430 putpad(clr_eol); 431 } 432 } 433
Indexes created Sat Sep 20 22:09:52 GMT 2025