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screen.c revision 1.29 
      1 /*	$NetBSD: screen.c,v 1.29 2014/07/13 16:23:55 pgoyette 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 (nocolor == 1)
    102 		return;
    103 	if (set_a_foreground == NULL)
    104 		return;
    105 
    106 	buf = tiparm(set_a_foreground, c == 7 ? 0 : c);
    107 	if (buf != NULL)
    108 		putpad(buf);
    109 }
    110 
    111 /*
    112  * Set up from termcap.
    113  */
    114 void
    115 scr_init(void)
    116 {
    117 
    118 	setupterm(NULL, 0, NULL);
    119 	if (clear_screen == NULL)
    120 		stop("cannot clear screen");
    121 	if (cursor_address == NULL || cursor_up == NULL)
    122 		stop("cannot do random cursor positioning");
    123 }
    124 
    125 /* this foolery is needed to modify tty state `atomically' */
    126 static jmp_buf scr_onstop;
    127 
    128 static void
    129 stopset(int sig)
    130 {
    131 	sigset_t set;
    132 
    133 	(void) signal(sig, SIG_DFL);
    134 	(void) kill(getpid(), sig);
    135 	sigemptyset(&set);
    136 	sigaddset(&set, sig);
    137 	(void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0);
    138 	longjmp(scr_onstop, 1);
    139 }
    140 
    141 static void
    142 scr_stop(int sig)
    143 {
    144 	sigset_t set;
    145 
    146 	scr_end();
    147 	(void) kill(getpid(), sig);
    148 	sigemptyset(&set);
    149 	sigaddset(&set, sig);
    150 	(void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0);
    151 	scr_set();
    152 	scr_msg(key_msg, 1);
    153 }
    154 
    155 /*
    156  * Set up screen mode.
    157  */
    158 void
    159 scr_set(void)
    160 {
    161 	struct winsize ws;
    162 	struct termios newtt;
    163 	sigset_t nsigset, osigset;
    164 	void (*ttou)(int);
    165 
    166 	sigemptyset(&nsigset);
    167 	sigaddset(&nsigset, SIGTSTP);
    168 	sigaddset(&nsigset, SIGTTOU);
    169 	(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
    170 	if ((tstp = signal(SIGTSTP, stopset)) == SIG_IGN)
    171 		(void) signal(SIGTSTP, SIG_IGN);
    172 	if ((ttou = signal(SIGTTOU, stopset)) == SIG_IGN)
    173 		(void) signal(SIGTTOU, SIG_IGN);
    174 	/*
    175 	 * At last, we are ready to modify the tty state.  If
    176 	 * we stop while at it, stopset() above will longjmp back
    177 	 * to the setjmp here and we will start over.
    178 	 */
    179 	(void) setjmp(scr_onstop);
    180 	(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
    181 	Rows = 0, Cols = 0;
    182 	if (ioctl(0, TIOCGWINSZ, &ws) == 0) {
    183 		Rows = ws.ws_row;
    184 		Cols = ws.ws_col;
    185 	}
    186 	if (Rows == 0)
    187 		Rows = lines;
    188 	if (Cols == 0)
    189 	    Cols = columns;
    190 	if (Rows < MINROWS || Cols < MINCOLS) {
    191 		(void) fprintf(stderr,
    192 		    "the screen is too small: must be at least %dx%d, ",
    193 		    MINCOLS, MINROWS);
    194 		stop("");	/* stop() supplies \n */
    195 	}
    196 	if (tcgetattr(0, &oldtt) < 0)
    197 		stop("tcgetattr() fails");
    198 	newtt = oldtt;
    199 	newtt.c_lflag &= ~(ICANON|ECHO);
    200 	newtt.c_oflag &= ~OXTABS;
    201 	if (tcsetattr(0, TCSADRAIN, &newtt) < 0)
    202 		stop("tcsetattr() fails");
    203 	ospeed = cfgetospeed(&newtt);
    204 	(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
    205 
    206 	/*
    207 	 * We made it.  We are now in screen mode, modulo TIstr
    208 	 * (which we will fix immediately).
    209 	 */
    210 	if (enter_ca_mode)
    211 		putstr(enter_ca_mode);
    212 	if (cursor_invisible)
    213 		putstr(cursor_invisible);
    214 	if (tstp != SIG_IGN)
    215 		(void) signal(SIGTSTP, scr_stop);
    216 	if (ttou != SIG_IGN)
    217 		(void) signal(SIGTTOU, ttou);
    218 
    219 	isset = 1;
    220 	(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
    221 	scr_clear();
    222 }
    223 
    224 /*
    225  * End screen mode.
    226  */
    227 void
    228 scr_end(void)
    229 {
    230 	sigset_t nsigset, osigset;
    231 
    232 	sigemptyset(&nsigset);
    233 	sigaddset(&nsigset, SIGTSTP);
    234 	sigaddset(&nsigset, SIGTTOU);
    235 	(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
    236 	/* move cursor to last line */
    237 	if (cursor_to_ll)
    238 		putstr(cursor_to_ll);
    239 	else
    240 		moveto(Rows - 1, 0);
    241 	/* exit screen mode */
    242 	if (exit_ca_mode)
    243 		putstr(exit_ca_mode);
    244 	if (cursor_normal)
    245 		putstr(cursor_normal);
    246 	(void) fflush(stdout);
    247 	(void) tcsetattr(0, TCSADRAIN, &oldtt);
    248 	isset = 0;
    249 	/* restore signals */
    250 	(void) signal(SIGTSTP, tstp);
    251 	(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
    252 }
    253 
    254 void
    255 stop(const char *why)
    256 {
    257 
    258 	if (isset)
    259 		scr_end();
    260 	(void) fprintf(stderr, "aborting: %s\n", why);
    261 	exit(1);
    262 }
    263 
    264 /*
    265  * Clear the screen, forgetting the current contents in the process.
    266  */
    267 void
    268 scr_clear(void)
    269 {
    270 
    271 	putpad(clear_screen);
    272 	curscore = -1;
    273 	memset((char *)curscreen, 0, sizeof(curscreen));
    274 }
    275 
    276 #if vax && !__GNUC__
    277 typedef int regcell;	/* pcc is bad at `register char', etc */
    278 #else
    279 typedef cell regcell;
    280 #endif
    281 
    282 /*
    283  * Update the screen.
    284  */
    285 void
    286 scr_update(void)
    287 {
    288 	cell *bp, *sp;
    289 	regcell so, cur_so = 0;
    290 	int i, ccol, j;
    291 	sigset_t nsigset, osigset;
    292 	static const struct shape *lastshape;
    293 
    294 	sigemptyset(&nsigset);
    295 	sigaddset(&nsigset, SIGTSTP);
    296 	(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
    297 
    298 	/* always leave cursor after last displayed point */
    299 	curscreen[D_LAST * B_COLS - 1] = -1;
    300 
    301 	if (score != curscore) {
    302 		if (cursor_home)
    303 			putpad(cursor_home);
    304 		else
    305 			moveto(0, 0);
    306 		(void) printf("Score: %d", score);
    307 		curscore = score;
    308 	}
    309 
    310 	/* draw preview of nextpattern */
    311 	if (showpreview && (nextshape != lastshape)) {
    312 		static int r=5, c=2;
    313 		int tr, tc, t;
    314 
    315 		lastshape = nextshape;
    316 
    317 		/* clean */
    318 		putpad(exit_standout_mode);
    319 		moveto(r-1, c-1); putstr("          ");
    320 		moveto(r,   c-1); putstr("          ");
    321 		moveto(r+1, c-1); putstr("          ");
    322 		moveto(r+2, c-1); putstr("          ");
    323 
    324 		moveto(r-3, c-2);
    325 		putstr("Next shape:");
    326 
    327 		/* draw */
    328 		putpad(enter_standout_mode);
    329 		setcolor(nextshape->color);
    330 		moveto(r, 2*c);
    331 		putstr("  ");
    332 		for(i=0; i<3; i++) {
    333 			t = c + r*B_COLS;
    334 			t += nextshape->off[i];
    335 
    336 			tr = t / B_COLS;
    337 			tc = t % B_COLS;
    338 
    339 			moveto(tr, 2*tc);
    340 			putstr("  ");
    341 		}
    342 		putpad(exit_standout_mode);
    343 	}
    344 
    345 	bp = &board[D_FIRST * B_COLS];
    346 	sp = &curscreen[D_FIRST * B_COLS];
    347 	for (j = D_FIRST; j < D_LAST; j++) {
    348 		ccol = -1;
    349 		for (i = 0; i < B_COLS; bp++, sp++, i++) {
    350 			if (*sp == (so = *bp))
    351 				continue;
    352 			*sp = so;
    353 			if (i != ccol) {
    354 				if (cur_so && move_standout_mode) {
    355 					putpad(exit_standout_mode);
    356 					cur_so = 0;
    357 				}
    358 				moveto(RTOD(j), CTOD(i));
    359 			}
    360 			if (enter_standout_mode) {
    361 				if (so != cur_so) {
    362 					putpad(so ?
    363 					    enter_standout_mode :
    364 					    exit_standout_mode);
    365 					cur_so = so;
    366 				}
    367 				setcolor(so);
    368 #ifdef DEBUG
    369 				char buf[3];
    370 				snprintf(buf, sizeof(buf), "%d%d", so, so);
    371 				putstr(buf);
    372 #else
    373 				putstr("  ");
    374 #endif
    375 			} else
    376 				putstr(so ? "XX" : "  ");
    377 			ccol = i + 1;
    378 			/*
    379 			 * Look ahead a bit, to avoid extra motion if
    380 			 * we will be redrawing the cell after the next.
    381 			 * Motion probably takes four or more characters,
    382 			 * so we save even if we rewrite two cells
    383 			 * `unnecessarily'.  Skip it all, though, if
    384 			 * the next cell is a different color.
    385 			 */
    386 #define	STOP (B_COLS - 3)
    387 			if (i > STOP || sp[1] != bp[1] || so != bp[1])
    388 				continue;
    389 			if (sp[2] != bp[2])
    390 				sp[1] = -1;
    391 			else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
    392 				sp[2] = -1;
    393 				sp[1] = -1;
    394 			}
    395 		}
    396 	}
    397 	if (cur_so)
    398 		putpad(exit_standout_mode);
    399 	(void) fflush(stdout);
    400 	(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
    401 }
    402 
    403 /*
    404  * Write a message (set!=0), or clear the same message (set==0).
    405  * (We need its length in case we have to overwrite with blanks.)
    406  */
    407 void
    408 scr_msg(char *s, int set)
    409 {
    410 
    411 	if (set || clr_eol == NULL) {
    412 		int l = strlen(s);
    413 
    414 		moveto(Rows - 2, ((Cols - l) >> 1) - 1);
    415 		if (set)
    416 			putstr(s);
    417 		else
    418 			while (--l >= 0)
    419 				(void) putchar(' ');
    420 	} else {
    421 		moveto(Rows - 2, 0);
    422 		putpad(clr_eol);
    423 	}
    424 }
    425