tetris/screen.c

   1 /*      $NetBSD: screen.c,v 1.33 2017/03/20 22:05:27 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         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 }