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screen.c revision 1.27 
      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 }
    403