tetris/screen.c

   1 /*      $NetBSD: screen.c,v 1.27 2011/10/03 12:32:28 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 = tiparm(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 }