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screen.c revision 1.32 
      1 /*	$NetBSD: screen.c,v 1.32 2016/03/03 21:38:55 nat 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 	if (enter_ca_mode)
    216 		putstr(enter_ca_mode);
    217 	if (cursor_invisible)
    218 		putstr(cursor_invisible);
    219 	if (tstp != SIG_IGN)
    220 		(void) signal(SIGTSTP, scr_stop);
    221 	if (ttou != SIG_IGN)
    222 		(void) signal(SIGTTOU, ttou);
    223 
    224 	isset = 1;
    225 	(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
    226 	scr_clear();
    227 }
    228 
    229 /*
    230  * End screen mode.
    231  */
    232 void
    233 scr_end(void)
    234 {
    235 	sigset_t nsigset, osigset;
    236 
    237 	sigemptyset(&nsigset);
    238 	sigaddset(&nsigset, SIGTSTP);
    239 	sigaddset(&nsigset, SIGTTOU);
    240 	(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
    241 	/* move cursor to last line */
    242 	if (cursor_to_ll)
    243 		putstr(cursor_to_ll);
    244 	else
    245 		moveto(Rows - 1, 0);
    246 	/* exit screen mode */
    247 	if (exit_ca_mode)
    248 		putstr(exit_ca_mode);
    249 	if (cursor_normal)
    250 		putstr(cursor_normal);
    251 	(void) fflush(stdout);
    252 	(void) tcsetattr(0, TCSADRAIN, &oldtt);
    253 	isset = 0;
    254 	/* restore signals */
    255 	(void) signal(SIGTSTP, tstp);
    256 	(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
    257 }
    258 
    259 void
    260 stop(const char *why)
    261 {
    262 
    263 	if (isset)
    264 		scr_end();
    265 	(void) fprintf(stderr, "aborting: %s\n", why);
    266 	exit(1);
    267 }
    268 
    269 /*
    270  * Clear the screen, forgetting the current contents in the process.
    271  */
    272 void
    273 scr_clear(void)
    274 {
    275 
    276 	putpad(clear_screen);
    277 	curscore = -1;
    278 	memset((char *)curscreen, 0, sizeof(curscreen));
    279 }
    280 
    281 #if vax && !__GNUC__
    282 typedef int regcell;	/* pcc is bad at `register char', etc */
    283 #else
    284 typedef cell regcell;
    285 #endif
    286 
    287 /*
    288  * Update the screen.
    289  */
    290 void
    291 scr_update(void)
    292 {
    293 	cell *bp, *sp;
    294 	regcell so, cur_so = 0;
    295 	int i, ccol, j;
    296 	sigset_t nsigset, osigset;
    297 	static const struct shape *lastshape;
    298 
    299 	sigemptyset(&nsigset);
    300 	sigaddset(&nsigset, SIGTSTP);
    301 	(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
    302 
    303 	/* always leave cursor after last displayed point */
    304 	curscreen[D_LAST * B_COLS - 1] = -1;
    305 
    306 	if (score != curscore) {
    307 		if (cursor_home)
    308 			putpad(cursor_home);
    309 		else
    310 			moveto(0, 0);
    311 		setcolor(0);
    312 		(void) printf("Score: %d", score);
    313 		curscore = score;
    314 	}
    315 
    316 	/* draw preview of nextpattern */
    317 	if (showpreview && (nextshape != lastshape)) {
    318 		static int r=5, c=2;
    319 		int tr, tc, t;
    320 
    321 		lastshape = nextshape;
    322 
    323 		/* clean */
    324 		putpad(exit_standout_mode);
    325 		moveto(r-1, c-1); putstr("          ");
    326 		moveto(r,   c-1); putstr("          ");
    327 		moveto(r+1, c-1); putstr("          ");
    328 		moveto(r+2, c-1); putstr("          ");
    329 
    330 		moveto(r-3, c-2);
    331 		putstr("Next shape:");
    332 
    333 		/* draw */
    334 		setcolor(nextshape->color);
    335 		putpad(enter_standout_mode);
    336 		moveto(r, 2*c);
    337 		putstr("  ");
    338 		for(i=0; i<3; i++) {
    339 			t = c + r*B_COLS;
    340 			t += nextshape->off[i];
    341 
    342 			tr = t / B_COLS;
    343 			tc = t % B_COLS;
    344 
    345 			moveto(tr, 2*tc);
    346 			putstr("  ");
    347 		}
    348 		putpad(exit_standout_mode);
    349 	}
    350 
    351 	bp = &board[D_FIRST * B_COLS];
    352 	sp = &curscreen[D_FIRST * B_COLS];
    353 	for (j = D_FIRST; j < D_LAST; j++) {
    354 		ccol = -1;
    355 		for (i = 0; i < B_COLS; bp++, sp++, i++) {
    356 			if (*sp == (so = *bp))
    357 				continue;
    358 			*sp = so;
    359 			if (i != ccol) {
    360 				if (cur_so && move_standout_mode) {
    361 					putpad(exit_standout_mode);
    362 					cur_so = 0;
    363 				}
    364 				moveto(RTOD(j + Offset), CTOD(i));
    365 			}
    366 			if (enter_standout_mode) {
    367 				if (so != cur_so) {
    368 					setcolor(so);
    369 					putpad(so ?
    370 					    enter_standout_mode :
    371 					    exit_standout_mode);
    372 					cur_so = so;
    373 				}
    374 #ifdef DEBUG
    375 				char buf[3];
    376 				snprintf(buf, sizeof(buf), "%d%d", so, so);
    377 				putstr(buf);
    378 #else
    379 				putstr("  ");
    380 #endif
    381 			} else
    382 				putstr(so ? "XX" : "  ");
    383 			ccol = i + 1;
    384 			/*
    385 			 * Look ahead a bit, to avoid extra motion if
    386 			 * we will be redrawing the cell after the next.
    387 			 * Motion probably takes four or more characters,
    388 			 * so we save even if we rewrite two cells
    389 			 * `unnecessarily'.  Skip it all, though, if
    390 			 * the next cell is a different color.
    391 			 */
    392 #define	STOP (B_COLS - 3)
    393 			if (i > STOP || sp[1] != bp[1] || so != bp[1])
    394 				continue;
    395 			if (sp[2] != bp[2])
    396 				sp[1] = -1;
    397 			else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
    398 				sp[2] = -1;
    399 				sp[1] = -1;
    400 			}
    401 		}
    402 	}
    403 	if (cur_so)
    404 		putpad(exit_standout_mode);
    405 	(void) fflush(stdout);
    406 	(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
    407 }
    408 
    409 /*
    410  * Write a message (set!=0), or clear the same message (set==0).
    411  * (We need its length in case we have to overwrite with blanks.)
    412  */
    413 void
    414 scr_msg(char *s, int set)
    415 {
    416 
    417 	if (set || clr_eol == NULL) {
    418 		int l = strlen(s);
    419 
    420 		moveto(Rows - 2, ((Cols - l) >> 1) - 1);
    421 		if (set)
    422 			putstr(s);
    423 		else
    424 			while (--l >= 0)
    425 				(void) putchar(' ');
    426 	} else {
    427 		moveto(Rows - 2, 0);
    428 		putpad(clr_eol);
    429 	}
    430 }
    431