1 /* $NetBSD: screen.c,v 1.26 2010/02/03 15:34:39 roy 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 = vtparm(cursor_address, r, c); 93 if (buf != NULL) 94 putpad(buf); 95 } 96 97 /* 98 * Set up from termcap. 99 */ 100 void 101 scr_init(void) 102 { 103 104 setupterm(NULL, 0, NULL); 105 if (clear_screen == NULL) 106 stop("cannot clear screen"); 107 if (cursor_address == NULL || cursor_up == NULL) 108 stop("cannot do random cursor positioning"); 109 } 110 111 /* this foolery is needed to modify tty state `atomically' */ 112 static jmp_buf scr_onstop; 113 114 static void 115 stopset(int sig) 116 { 117 sigset_t set; 118 119 (void) signal(sig, SIG_DFL); 120 (void) kill(getpid(), sig); 121 sigemptyset(&set); 122 sigaddset(&set, sig); 123 (void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0); 124 longjmp(scr_onstop, 1); 125 } 126 127 static void 128 scr_stop(int sig) 129 { 130 sigset_t set; 131 132 scr_end(); 133 (void) kill(getpid(), sig); 134 sigemptyset(&set); 135 sigaddset(&set, sig); 136 (void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0); 137 scr_set(); 138 scr_msg(key_msg, 1); 139 } 140 141 /* 142 * Set up screen mode. 143 */ 144 void 145 scr_set(void) 146 { 147 struct winsize ws; 148 struct termios newtt; 149 sigset_t nsigset, osigset; 150 void (*ttou)(int); 151 152 sigemptyset(&nsigset); 153 sigaddset(&nsigset, SIGTSTP); 154 sigaddset(&nsigset, SIGTTOU); 155 (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset); 156 if ((tstp = signal(SIGTSTP, stopset)) == SIG_IGN) 157 (void) signal(SIGTSTP, SIG_IGN); 158 if ((ttou = signal(SIGTTOU, stopset)) == SIG_IGN) 159 (void) signal(SIGTTOU, SIG_IGN); 160 /* 161 * At last, we are ready to modify the tty state. If 162 * we stop while at it, stopset() above will longjmp back 163 * to the setjmp here and we will start over. 164 */ 165 (void) setjmp(scr_onstop); 166 (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); 167 Rows = 0, Cols = 0; 168 if (ioctl(0, TIOCGWINSZ, &ws) == 0) { 169 Rows = ws.ws_row; 170 Cols = ws.ws_col; 171 } 172 if (Rows == 0) 173 Rows = lines; 174 if (Cols == 0) 175 Cols = columns; 176 if (Rows < MINROWS || Cols < MINCOLS) { 177 (void) fprintf(stderr, 178 "the screen is too small: must be at least %dx%d, ", 179 MINCOLS, MINROWS); 180 stop(""); /* stop() supplies \n */ 181 } 182 if (tcgetattr(0, &oldtt) < 0) 183 stop("tcgetattr() fails"); 184 newtt = oldtt; 185 newtt.c_lflag &= ~(ICANON|ECHO); 186 newtt.c_oflag &= ~OXTABS; 187 if (tcsetattr(0, TCSADRAIN, &newtt) < 0) 188 stop("tcsetattr() fails"); 189 ospeed = cfgetospeed(&newtt); 190 (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset); 191 192 /* 193 * We made it. We are now in screen mode, modulo TIstr 194 * (which we will fix immediately). 195 */ 196 if (enter_ca_mode) 197 putstr(enter_ca_mode); 198 if (cursor_invisible) 199 putstr(cursor_invisible); 200 if (tstp != SIG_IGN) 201 (void) signal(SIGTSTP, scr_stop); 202 if (ttou != SIG_IGN) 203 (void) signal(SIGTTOU, ttou); 204 205 isset = 1; 206 (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); 207 scr_clear(); 208 } 209 210 /* 211 * End screen mode. 212 */ 213 void 214 scr_end(void) 215 { 216 sigset_t nsigset, osigset; 217 218 sigemptyset(&nsigset); 219 sigaddset(&nsigset, SIGTSTP); 220 sigaddset(&nsigset, SIGTTOU); 221 (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset); 222 /* move cursor to last line */ 223 if (cursor_to_ll) 224 putstr(cursor_to_ll); 225 else 226 moveto(Rows - 1, 0); 227 /* exit screen mode */ 228 if (exit_ca_mode) 229 putstr(exit_ca_mode); 230 if (cursor_normal) 231 putstr(cursor_normal); 232 (void) fflush(stdout); 233 (void) tcsetattr(0, TCSADRAIN, &oldtt); 234 isset = 0; 235 /* restore signals */ 236 (void) signal(SIGTSTP, tstp); 237 (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); 238 } 239 240 void 241 stop(const char *why) 242 { 243 244 if (isset) 245 scr_end(); 246 (void) fprintf(stderr, "aborting: %s\n", why); 247 exit(1); 248 } 249 250 /* 251 * Clear the screen, forgetting the current contents in the process. 252 */ 253 void 254 scr_clear(void) 255 { 256 257 putpad(clear_screen); 258 curscore = -1; 259 memset((char *)curscreen, 0, sizeof(curscreen)); 260 } 261 262 #if vax && !__GNUC__ 263 typedef int regcell; /* pcc is bad at `register char', etc */ 264 #else 265 typedef cell regcell; 266 #endif 267 268 /* 269 * Update the screen. 270 */ 271 void 272 scr_update(void) 273 { 274 cell *bp, *sp; 275 regcell so, cur_so = 0; 276 int i, ccol, j; 277 sigset_t nsigset, osigset; 278 static const struct shape *lastshape; 279 280 sigemptyset(&nsigset); 281 sigaddset(&nsigset, SIGTSTP); 282 (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset); 283 284 /* always leave cursor after last displayed point */ 285 curscreen[D_LAST * B_COLS - 1] = -1; 286 287 if (score != curscore) { 288 if (cursor_home) 289 putpad(cursor_home); 290 else 291 moveto(0, 0); 292 (void) printf("Score: %d", score); 293 curscore = score; 294 } 295 296 /* draw preview of nextpattern */ 297 if (showpreview && (nextshape != lastshape)) { 298 static int r=5, c=2; 299 int tr, tc, t; 300 301 lastshape = nextshape; 302 303 /* clean */ 304 putpad(exit_standout_mode); 305 moveto(r-1, c-1); putstr(" "); 306 moveto(r, c-1); putstr(" "); 307 moveto(r+1, c-1); putstr(" "); 308 moveto(r+2, c-1); putstr(" "); 309 310 moveto(r-3, c-2); 311 putstr("Next shape:"); 312 313 /* draw */ 314 putpad(enter_standout_mode); 315 moveto(r, 2*c); 316 putstr(" "); 317 for(i=0; i<3; i++) { 318 t = c + r*B_COLS; 319 t += nextshape->off[i]; 320 321 tr = t / B_COLS; 322 tc = t % B_COLS; 323 324 moveto(tr, 2*tc); 325 putstr(" "); 326 } 327 putpad(exit_standout_mode); 328 } 329 330 bp = &board[D_FIRST * B_COLS]; 331 sp = &curscreen[D_FIRST * B_COLS]; 332 for (j = D_FIRST; j < D_LAST; j++) { 333 ccol = -1; 334 for (i = 0; i < B_COLS; bp++, sp++, i++) { 335 if (*sp == (so = *bp)) 336 continue; 337 *sp = so; 338 if (i != ccol) { 339 if (cur_so && move_standout_mode) { 340 putpad(exit_standout_mode); 341 cur_so = 0; 342 } 343 moveto(RTOD(j), CTOD(i)); 344 } 345 if (enter_standout_mode) { 346 if (so != cur_so) { 347 putpad(so ? 348 enter_standout_mode : 349 exit_standout_mode); 350 cur_so = so; 351 } 352 putstr(" "); 353 } else 354 putstr(so ? "XX" : " "); 355 ccol = i + 1; 356 /* 357 * Look ahead a bit, to avoid extra motion if 358 * we will be redrawing the cell after the next. 359 * Motion probably takes four or more characters, 360 * so we save even if we rewrite two cells 361 * `unnecessarily'. Skip it all, though, if 362 * the next cell is a different color. 363 */ 364 #define STOP (B_COLS - 3) 365 if (i > STOP || sp[1] != bp[1] || so != bp[1]) 366 continue; 367 if (sp[2] != bp[2]) 368 sp[1] = -1; 369 else if (i < STOP && so == bp[2] && sp[3] != bp[3]) { 370 sp[2] = -1; 371 sp[1] = -1; 372 } 373 } 374 } 375 if (cur_so) 376 putpad(exit_standout_mode); 377 (void) fflush(stdout); 378 (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); 379 } 380 381 /* 382 * Write a message (set!=0), or clear the same message (set==0). 383 * (We need its length in case we have to overwrite with blanks.) 384 */ 385 void 386 scr_msg(char *s, int set) 387 { 388 389 if (set || clr_eol == NULL) { 390 int l = strlen(s); 391 392 moveto(Rows - 2, ((Cols - l) >> 1) - 1); 393 if (set) 394 putstr(s); 395 else 396 while (--l >= 0) 397 (void) putchar(' '); 398 } else { 399 moveto(Rows - 2, 0); 400 putpad(clr_eol); 401 } 402 } 403