tetris/screen.c

   1 /*      $NetBSD: screen.c,v 1.28 2014/06/11 16:47:39 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  *      @(#)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         if (set_a_foreground == NULL)
 102                 return;
 103
 104         buf = tiparm(set_a_foreground, c == 7 ? 0 : c);
 105         if (buf != NULL)
 106                 putpad(buf);
 107 }
 108
 109 /*
 110  * Set up from termcap.
 111  */
 112 void
 113 scr_init(void)
 114 {
 115
 116         setupterm(NULL, 0, NULL);
 117         if (clear_screen == NULL)
 118                 stop("cannot clear screen");
 119         if (cursor_address == NULL || cursor_up == NULL)
 120                 stop("cannot do random cursor positioning");
 121 }
 122
 123 /* this foolery is needed to modify tty state `atomically' */
 124 static jmp_buf scr_onstop;
 125
 126 static void
 127 stopset(int sig)
 128 {
 129         sigset_t set;
 130
 131         (void) signal(sig, SIG_DFL);
 132         (void) kill(getpid(), sig);
 133         sigemptyset(&set);
 134         sigaddset(&set, sig);
 135         (void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0);
 136         longjmp(scr_onstop, 1);
 137 }
 138
 139 static void
 140 scr_stop(int sig)
 141 {
 142         sigset_t set;
 143
 144         scr_end();
 145         (void) kill(getpid(), sig);
 146         sigemptyset(&set);
 147         sigaddset(&set, sig);
 148         (void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0);
 149         scr_set();
 150         scr_msg(key_msg, 1);
 151 }
 152
 153 /*
 154  * Set up screen mode.
 155  */
 156 void
 157 scr_set(void)
 158 {
 159         struct winsize ws;
 160         struct termios newtt;
 161         sigset_t nsigset, osigset;
 162         void (*ttou)(int);
 163
 164         sigemptyset(&nsigset);
 165         sigaddset(&nsigset, SIGTSTP);
 166         sigaddset(&nsigset, SIGTTOU);
 167         (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
 168         if ((tstp = signal(SIGTSTP, stopset)) == SIG_IGN)
 169                 (void) signal(SIGTSTP, SIG_IGN);
 170         if ((ttou = signal(SIGTTOU, stopset)) == SIG_IGN)
 171                 (void) signal(SIGTTOU, SIG_IGN);
 172         /*
 173          * At last, we are ready to modify the tty state.  If
 174          * we stop while at it, stopset() above will longjmp back
 175          * to the setjmp here and we will start over.
 176          */
 177         (void) setjmp(scr_onstop);
 178         (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
 179         Rows = 0, Cols = 0;
 180         if (ioctl(0, TIOCGWINSZ, &ws) == 0) {
 181                 Rows = ws.ws_row;
 182                 Cols = ws.ws_col;
 183         }
 184         if (Rows == 0)
 185                 Rows = lines;
 186         if (Cols == 0)
 187             Cols = columns;
 188         if (Rows < MINROWS || Cols < MINCOLS) {
 189                 (void) fprintf(stderr,
 190                     "the screen is too small: must be at least %dx%d, ",
 191                     MINCOLS, MINROWS);
 192                 stop("");       /* stop() supplies \n */
 193         }
 194         if (tcgetattr(0, &oldtt) < 0)
 195                 stop("tcgetattr() fails");
 196         newtt = oldtt;
 197         newtt.c_lflag &= ~(ICANON|ECHO);
 198         newtt.c_oflag &= ~OXTABS;
 199         if (tcsetattr(0, TCSADRAIN, &newtt) < 0)
 200                 stop("tcsetattr() fails");
 201         ospeed = cfgetospeed(&newtt);
 202         (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
 203
 204         /*
 205          * We made it.  We are now in screen mode, modulo TIstr
 206          * (which we will fix immediately).
 207          */
 208         if (enter_ca_mode)
 209                 putstr(enter_ca_mode);
 210         if (cursor_invisible)
 211                 putstr(cursor_invisible);
 212         if (tstp != SIG_IGN)
 213                 (void) signal(SIGTSTP, scr_stop);
 214         if (ttou != SIG_IGN)
 215                 (void) signal(SIGTTOU, ttou);
 216
 217         isset = 1;
 218         (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
 219         scr_clear();
 220 }
 221
 222 /*
 223  * End screen mode.
 224  */
 225 void
 226 scr_end(void)
 227 {
 228         sigset_t nsigset, osigset;
 229
 230         sigemptyset(&nsigset);
 231         sigaddset(&nsigset, SIGTSTP);
 232         sigaddset(&nsigset, SIGTTOU);
 233         (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
 234         /* move cursor to last line */
 235         if (cursor_to_ll)
 236                 putstr(cursor_to_ll);
 237         else
 238                 moveto(Rows - 1, 0);
 239         /* exit screen mode */
 240         if (exit_ca_mode)
 241                 putstr(exit_ca_mode);
 242         if (cursor_normal)
 243                 putstr(cursor_normal);
 244         (void) fflush(stdout);
 245         (void) tcsetattr(0, TCSADRAIN, &oldtt);
 246         isset = 0;
 247         /* restore signals */
 248         (void) signal(SIGTSTP, tstp);
 249         (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
 250 }
 251
 252 void
 253 stop(const char *why)
 254 {
 255
 256         if (isset)
 257                 scr_end();
 258         (void) fprintf(stderr, "aborting: %s\n", why);
 259         exit(1);
 260 }
 261
 262 /*
 263  * Clear the screen, forgetting the current contents in the process.
 264  */
 265 void
 266 scr_clear(void)
 267 {
 268
 269         putpad(clear_screen);
 270         curscore = -1;
 271         memset((char *)curscreen, 0, sizeof(curscreen));
 272 }
 273
 274 #if vax && !__GNUC__
 275 typedef int regcell;    /* pcc is bad at `register char', etc */
 276 #else
 277 typedef cell regcell;
 278 #endif
 279
 280 /*
 281  * Update the screen.
 282  */
 283 void
 284 scr_update(void)
 285 {
 286         cell *bp, *sp;
 287         regcell so, cur_so = 0;
 288         int i, ccol, j;
 289         sigset_t nsigset, osigset;
 290         static const struct shape *lastshape;
 291
 292         sigemptyset(&nsigset);
 293         sigaddset(&nsigset, SIGTSTP);
 294         (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
 295
 296         /* always leave cursor after last displayed point */
 297         curscreen[D_LAST * B_COLS - 1] = -1;
 298
 299         if (score != curscore) {
 300                 if (cursor_home)
 301                         putpad(cursor_home);
 302                 else
 303                         moveto(0, 0);
 304                 (void) printf("Score: %d", score);
 305                 curscore = score;
 306         }
 307
 308         /* draw preview of nextpattern */
 309         if (showpreview && (nextshape != lastshape)) {
 310                 static int r=5, c=2;
 311                 int tr, tc, t;
 312
 313                 lastshape = nextshape;
 314
 315                 /* clean */
 316                 putpad(exit_standout_mode);
 317                 moveto(r-1, c-1); putstr("          ");
 318                 moveto(r,   c-1); putstr("          ");
 319                 moveto(r+1, c-1); putstr("          ");
 320                 moveto(r+2, c-1); putstr("          ");
 321
 322                 moveto(r-3, c-2);
 323                 putstr("Next shape:");
 324
 325                 /* draw */
 326                 putpad(enter_standout_mode);
 327                 setcolor(nextshape->color);
 328                 moveto(r, 2*c);
 329                 putstr("  ");
 330                 for(i=0; i<3; i++) {
 331                         t = c + r*B_COLS;
 332                         t += nextshape->off[i];
 333
 334                         tr = t / B_COLS;
 335                         tc = t % B_COLS;
 336
 337                         moveto(tr, 2*tc);
 338                         putstr("  ");
 339                 }
 340                 putpad(exit_standout_mode);
 341         }
 342
 343         bp = &board[D_FIRST * B_COLS];
 344         sp = &curscreen[D_FIRST * B_COLS];
 345         for (j = D_FIRST; j < D_LAST; j++) {
 346                 ccol = -1;
 347                 for (i = 0; i < B_COLS; bp++, sp++, i++) {
 348                         if (*sp == (so = *bp))
 349                                 continue;
 350                         *sp = so;
 351                         if (i != ccol) {
 352                                 if (cur_so && move_standout_mode) {
 353                                         putpad(exit_standout_mode);
 354                                         cur_so = 0;
 355                                 }
 356                                 moveto(RTOD(j), CTOD(i));
 357                         }
 358                         if (enter_standout_mode) {
 359                                 if (so != cur_so) {
 360                                         putpad(so ?
 361                                             enter_standout_mode :
 362                                             exit_standout_mode);
 363                                         cur_so = so;
 364                                 }
 365                                 setcolor(so);
 366 #ifdef DEBUG
 367                                 char buf[3];
 368                                 snprintf(buf, sizeof(buf), "%d%d", so, so);
 369                                 putstr(buf);
 370 #else
 371                                 putstr("  ");
 372 #endif
 373                         } else
 374                                 putstr(so ? "XX" : "  ");
 375                         ccol = i + 1;
 376                         /*
 377                          * Look ahead a bit, to avoid extra motion if
 378                          * we will be redrawing the cell after the next.
 379                          * Motion probably takes four or more characters,
 380                          * so we save even if we rewrite two cells
 381                          * `unnecessarily'.  Skip it all, though, if
 382                          * the next cell is a different color.
 383                          */
 384 #define STOP (B_COLS - 3)
 385                         if (i > STOP || sp[1] != bp[1] || so != bp[1])
 386                                 continue;
 387                         if (sp[2] != bp[2])
 388                                 sp[1] = -1;
 389                         else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
 390                                 sp[2] = -1;
 391                                 sp[1] = -1;
 392                         }
 393                 }
 394         }
 395         if (cur_so)
 396                 putpad(exit_standout_mode);
 397         (void) fflush(stdout);
 398         (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
 399 }
 400
 401 /*
 402  * Write a message (set!=0), or clear the same message (set==0).
 403  * (We need its length in case we have to overwrite with blanks.)
 404  */
 405 void
 406 scr_msg(char *s, int set)
 407 {
 408
 409         if (set || clr_eol == NULL) {
 410                 int l = strlen(s);
 411
 412                 moveto(Rows - 2, ((Cols - l) >> 1) - 1);
 413                 if (set)
 414                         putstr(s);
 415                 else
 416                         while (--l >= 0)
 417                                 (void) putchar(' ');
 418         } else {
 419                 moveto(Rows - 2, 0);
 420                 putpad(clr_eol);
 421         }
 422 }