NetBSD-5.0.2/games/tetris/screen.c
/* $NetBSD: screen.c,v 1.22 2008/01/28 01:38:59 dholland Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek and Darren F. Provine.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)screen.c 8.1 (Berkeley) 5/31/93
*/
/*
* Tetris screen control.
*/
#include <sys/cdefs.h>
#include <sys/ioctl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termcap.h>
#include <termios.h>
#include <unistd.h>
#ifndef sigmask
#define sigmask(s) (1 << ((s) - 1))
#endif
#include "screen.h"
#include "tetris.h"
static cell curscreen[B_SIZE]; /* 1 => standout (or otherwise marked) */
static int curscore;
static int isset; /* true => terminal is in game mode */
static struct termios oldtt;
static void (*tstp)(int);
static void scr_stop(int);
static void stopset(int) __dead;
/*
* Capabilities from TERMCAP.
*/
short ospeed;
static char
*bcstr, /* backspace char */
*CEstr, /* clear to end of line */
*CLstr, /* clear screen */
*CMstr, /* cursor motion string */
#ifdef unneeded
*CRstr, /* "\r" equivalent */
#endif
*HOstr, /* cursor home */
*LLstr, /* last line, first column */
*pcstr, /* pad character */
*TEstr, /* end cursor motion mode */
*TIstr; /* begin cursor motion mode */
char
*SEstr, /* end standout mode */
*SOstr; /* begin standout mode */
static int
COnum, /* co# value */
LInum, /* li# value */
MSflag; /* can move in standout mode */
struct tcsinfo { /* termcap string info; some abbrevs above */
char tcname[3];
char **tcaddr;
} tcstrings[] = {
{"bc", &bcstr},
{"ce", &CEstr},
{"cl", &CLstr},
{"cm", &CMstr},
#ifdef unneeded
{"cr", &CRstr},
#endif
{"le", &BC}, /* move cursor left one space */
{"pc", &pcstr},
{"se", &SEstr},
{"so", &SOstr},
{"te", &TEstr},
{"ti", &TIstr},
{"up", &UP}, /* cursor up */
{ {0}, NULL}
};
/* This is where we will actually stuff the information */
static struct tinfo *info;
/*
* Routine used by tputs().
*/
int
put(c)
int c;
{
return (putchar(c));
}
/*
* putstr() is for unpadded strings (either as in termcap(5) or
* simply literal strings); putpad() is for padded strings with
* count=1. (See screen.h for putpad().)
*/
#define putstr(s) (void)fputs(s, stdout)
void
moveto(int r, int c)
{
char buf[256];
if (t_goto(info, CMstr, c, r, buf, 255) == 0)
putpad(buf);
}
/*
* Set up from termcap.
*/
void
scr_init()
{
static int bsflag, xsflag, sgnum;
#ifdef unneeded
static int ncflag;
#endif
char *term;
static struct tcninfo { /* termcap numeric and flag info */
char tcname[3];
int *tcaddr;
} tcflags[] = {
{"bs", &bsflag},
{"ms", &MSflag},
#ifdef unneeded
{"nc", &ncflag},
#endif
{"xs", &xsflag},
{ {0}, NULL}
}, tcnums[] = {
{"co", &COnum},
{"li", &LInum},
{"sg", &sgnum},
{ {0}, NULL}
};
static char backspace[] = "\b";
if ((term = getenv("TERM")) == NULL)
stop("you must set the TERM environment variable");
if (t_getent(&info, term) <= 0)
stop("cannot find your termcap");
{
struct tcsinfo *p;
for (p = tcstrings; p->tcaddr; p++)
*p->tcaddr = t_agetstr(info, p->tcname);
}
{
struct tcninfo *p;
for (p = tcflags; p->tcaddr; p++)
*p->tcaddr = t_getflag(info, p->tcname);
for (p = tcnums; p->tcaddr; p++)
*p->tcaddr = t_getnum(info, p->tcname);
}
if (bsflag)
BC = backspace;
else if (BC == NULL && bcstr != NULL)
BC = bcstr;
if (CLstr == NULL)
stop("cannot clear screen");
if (CMstr == NULL || UP == NULL || BC == NULL)
stop("cannot do random cursor positioning via tgoto()");
PC = pcstr ? *pcstr : 0;
if (sgnum >= 0 || xsflag)
SOstr = SEstr = NULL;
#ifdef unneeded
if (ncflag)
CRstr = NULL;
else if (CRstr == NULL)
CRstr = "\r";
#endif
}
/* this foolery is needed to modify tty state `atomically' */
static jmp_buf scr_onstop;
static void
stopset(sig)
int sig;
{
sigset_t set;
(void) signal(sig, SIG_DFL);
(void) kill(getpid(), sig);
sigemptyset(&set);
sigaddset(&set, sig);
(void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0);
longjmp(scr_onstop, 1);
}
static void
scr_stop(sig)
int sig;
{
sigset_t set;
scr_end();
(void) kill(getpid(), sig);
sigemptyset(&set);
sigaddset(&set, sig);
(void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0);
scr_set();
scr_msg(key_msg, 1);
}
/*
* Set up screen mode.
*/
void
scr_set()
{
struct winsize ws;
struct termios newtt;
sigset_t nsigset, osigset;
void (*ttou)(int);
sigemptyset(&nsigset);
sigaddset(&nsigset, SIGTSTP);
sigaddset(&nsigset, SIGTTOU);
(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
if ((tstp = signal(SIGTSTP, stopset)) == SIG_IGN)
(void) signal(SIGTSTP, SIG_IGN);
if ((ttou = signal(SIGTTOU, stopset)) == SIG_IGN)
(void) signal(SIGTTOU, SIG_IGN);
/*
* At last, we are ready to modify the tty state. If
* we stop while at it, stopset() above will longjmp back
* to the setjmp here and we will start over.
*/
(void) setjmp(scr_onstop);
(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
Rows = 0, Cols = 0;
if (ioctl(0, TIOCGWINSZ, &ws) == 0) {
Rows = ws.ws_row;
Cols = ws.ws_col;
}
if (Rows == 0)
Rows = LInum;
if (Cols == 0)
Cols = COnum;
if (Rows < MINROWS || Cols < MINCOLS) {
(void) fprintf(stderr,
"the screen is too small: must be at least %dx%d, ",
MINCOLS, MINROWS);
stop(""); /* stop() supplies \n */
}
if (tcgetattr(0, &oldtt) < 0)
stop("tcgetattr() fails");
newtt = oldtt;
newtt.c_lflag &= ~(ICANON|ECHO);
newtt.c_oflag &= ~OXTABS;
if (tcsetattr(0, TCSADRAIN, &newtt) < 0)
stop("tcsetattr() fails");
ospeed = cfgetospeed(&newtt);
(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
/*
* We made it. We are now in screen mode, modulo TIstr
* (which we will fix immediately).
*/
if (TIstr)
putstr(TIstr); /* termcap(5) says this is not padded */
if (tstp != SIG_IGN)
(void) signal(SIGTSTP, scr_stop);
if (ttou != SIG_IGN)
(void) signal(SIGTTOU, ttou);
isset = 1;
(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
scr_clear();
}
/*
* End screen mode.
*/
void
scr_end()
{
sigset_t nsigset, osigset;
sigemptyset(&nsigset);
sigaddset(&nsigset, SIGTSTP);
sigaddset(&nsigset, SIGTTOU);
(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
/* move cursor to last line */
if (LLstr)
putstr(LLstr); /* termcap(5) says this is not padded */
else
moveto(Rows - 1, 0);
/* exit screen mode */
if (TEstr)
putstr(TEstr); /* termcap(5) says this is not padded */
(void) fflush(stdout);
(void) tcsetattr(0, TCSADRAIN, &oldtt);
isset = 0;
/* restore signals */
(void) signal(SIGTSTP, tstp);
(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
}
void
stop(why)
const char *why;
{
if (isset)
scr_end();
(void) fprintf(stderr, "aborting: %s\n", why);
exit(1);
}
/*
* Clear the screen, forgetting the current contents in the process.
*/
void
scr_clear()
{
putpad(CLstr);
curscore = -1;
memset((char *)curscreen, 0, sizeof(curscreen));
}
#if vax && !__GNUC__
typedef int regcell; /* pcc is bad at `register char', etc */
#else
typedef cell regcell;
#endif
/*
* Update the screen.
*/
void
scr_update()
{
cell *bp, *sp;
regcell so, cur_so = 0;
int i, ccol, j;
sigset_t nsigset, osigset;
static const struct shape *lastshape;
sigemptyset(&nsigset);
sigaddset(&nsigset, SIGTSTP);
(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
/* always leave cursor after last displayed point */
curscreen[D_LAST * B_COLS - 1] = -1;
if (score != curscore) {
if (HOstr)
putpad(HOstr);
else
moveto(0, 0);
(void) printf("Score: %d", score);
curscore = score;
}
/* draw preview of nextpattern */
if (showpreview && (nextshape != lastshape)) {
static int r=5, c=2;
int tr, tc, t;
lastshape = nextshape;
/* clean */
putpad(SEstr);
moveto(r-1, c-1); putstr(" ");
moveto(r, c-1); putstr(" ");
moveto(r+1, c-1); putstr(" ");
moveto(r+2, c-1); putstr(" ");
moveto(r-3, c-2);
putstr("Next shape:");
/* draw */
putpad(SOstr);
moveto(r, 2*c);
putstr(" ");
for(i=0; i<3; i++) {
t = c + r*B_COLS;
t += nextshape->off[i];
tr = t / B_COLS;
tc = t % B_COLS;
moveto(tr, 2*tc);
putstr(" ");
}
putpad(SEstr);
}
bp = &board[D_FIRST * B_COLS];
sp = &curscreen[D_FIRST * B_COLS];
for (j = D_FIRST; j < D_LAST; j++) {
ccol = -1;
for (i = 0; i < B_COLS; bp++, sp++, i++) {
if (*sp == (so = *bp))
continue;
*sp = so;
if (i != ccol) {
if (cur_so && MSflag) {
putpad(SEstr);
cur_so = 0;
}
moveto(RTOD(j), CTOD(i));
}
if (SOstr) {
if (so != cur_so) {
putpad(so ? SOstr : SEstr);
cur_so = so;
}
putstr(" ");
} else
putstr(so ? "XX" : " ");
ccol = i + 1;
/*
* Look ahead a bit, to avoid extra motion if
* we will be redrawing the cell after the next.
* Motion probably takes four or more characters,
* so we save even if we rewrite two cells
* `unnecessarily'. Skip it all, though, if
* the next cell is a different color.
*/
#define STOP (B_COLS - 3)
if (i > STOP || sp[1] != bp[1] || so != bp[1])
continue;
if (sp[2] != bp[2])
sp[1] = -1;
else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
sp[2] = -1;
sp[1] = -1;
}
}
}
if (cur_so)
putpad(SEstr);
(void) fflush(stdout);
(void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
}
/*
* Write a message (set!=0), or clear the same message (set==0).
* (We need its length in case we have to overwrite with blanks.)
*/
void
scr_msg(s, set)
char *s;
int set;
{
if (set || CEstr == NULL) {
int l = strlen(s);
moveto(Rows - 2, ((Cols - l) >> 1) - 1);
if (set)
putstr(s);
else
while (--l >= 0)
(void) putchar(' ');
} else {
moveto(Rows - 2, 0);
putpad(CEstr);
}
}