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      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