4.4BSD/usr/src/games/tetris/screen.c
/*-
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 <sgtty.h>
#include <sys/ioctl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef sigmask
#define sigmask(s) (1 << ((s) - 1))
#endif
#include "screen.h"
#include "tetris.h"
/*
* XXX - need a <termcap.h>
*/
int tgetent __P((char *, const char *));
int tgetflag __P((const char *));
int tgetnum __P((const char *));
int tputs __P((const char *, int, int (*)(int)));
static cell curscreen[B_SIZE]; /* 1 => standout (or otherwise marked) */
static int curscore;
static int isset; /* true => terminal is in game mode */
static struct sgttyb oldtt;
static void (*tstp)();
char *tgetstr(), *tgoto();
/*
* Capabilities from TERMCAP.
*/
char PC, *BC, *UP; /* tgoto requires globals: ugh! */
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
};
/* This is where we will actually stuff the information */
static char combuf[1024], tbuf[1024];
/*
* 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)
#define moveto(r, c) putpad(tgoto(CMstr, c, r))
/*
* Set up from termcap.
*/
void
scr_init()
{
static int bsflag, xsflag, sgnum;
#ifdef unneeded
static int ncflag;
#endif
char *term, *fill;
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
}, tcnums[] = {
"co", &COnum,
"li", &LInum,
"sg", &sgnum,
0
};
if ((term = getenv("TERM")) == NULL)
stop("you must set the TERM environment variable");
if (tgetent(tbuf, term) <= 0)
stop("cannot find your termcap");
fill = combuf;
{
register struct tcsinfo *p;
for (p = tcstrings; p->tcaddr; p++)
*p->tcaddr = tgetstr(p->tcname, &fill);
}
{
register struct tcninfo *p;
for (p = tcflags; p->tcaddr; p++)
*p->tcaddr = tgetflag(p->tcname);
for (p = tcnums; p->tcaddr; p++)
*p->tcaddr = tgetnum(p->tcname);
}
if (bsflag)
BC = "\b";
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;
#define sigunblock(mask) sigsetmask(sigblock(0) & ~(mask))
static void
stopset(sig)
int sig;
{
(void) signal(sig, SIG_DFL);
(void) kill(getpid(), sig);
(void) sigunblock(sigmask(sig));
longjmp(scr_onstop, 1);
}
static void
scr_stop()
{
scr_end();
(void) kill(getpid(), SIGTSTP);
(void) sigunblock(sigmask(SIGTSTP));
scr_set();
scr_msg(key_msg, 1);
}
/*
* Set up screen mode.
*/
void
scr_set()
{
struct winsize ws;
struct sgttyb newtt;
volatile int omask;
void (*ttou)();
omask = sigblock(sigmask(SIGTSTP) | sigmask(SIGTTOU));
if ((tstp = signal(SIGTSTP, stopset)) == SIG_IGN)
(void) signal(SIGTSTP, SIG_IGN);
if ((ttou = signal(SIGTSTP, stopset)) == SIG_IGN)
(void) signal(SIGTSTP, 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) sigsetmask(omask);
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 %d x %d",
MINROWS, MINCOLS);
stop(""); /* stop() supplies \n */
}
if (ioctl(0, TIOCGETP, &oldtt))
stop("ioctl(TIOCGETP) fails");
newtt = oldtt;
newtt.sg_flags = (newtt.sg_flags | CBREAK) & ~(CRMOD | ECHO);
if ((newtt.sg_flags & TBDELAY) == XTABS)
newtt.sg_flags &= ~TBDELAY;
if (ioctl(0, TIOCSETN, &newtt))
stop("ioctl(TIOCSETN) fails");
ospeed = newtt.sg_ospeed;
omask = sigblock(sigmask(SIGTSTP) | sigmask(SIGTTOU));
/*
* 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);
(void) signal(SIGTTOU, ttou);
isset = 1;
(void) sigsetmask(omask);
scr_clear();
}
/*
* End screen mode.
*/
void
scr_end()
{
int omask = sigblock(sigmask(SIGTSTP) | sigmask(SIGTTOU));
/* 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) ioctl(0, TIOCSETN, &oldtt);
isset = 0;
/* restore signals */
(void) signal(SIGTSTP, tstp);
(void) sigsetmask(omask);
}
void
stop(why)
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;
bzero((char *)curscreen, 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()
{
register cell *bp, *sp;
register regcell so, cur_so = 0;
register int i, ccol, j;
int omask = sigblock(sigmask(SIGTSTP));
/* 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("%d", score);
curscore = score;
}
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) sigsetmask(omask);
}
/*
* 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)
register char *s;
int set;
{
if (set || CEstr == NULL) {
register 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);
}
}