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