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Initial revision
git-svn-id: file:///srv/svn/joey/bsdgames-trunk@5086 a4a2c43b-8ac3-0310-8836-e0e880c912e2
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joey
181
trek/dumpgame.c
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181
trek/dumpgame.c
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/* $NetBSD: dumpgame.c,v 1.6 1998/09/11 14:26:19 hubertf Exp $ */
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/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)dumpgame.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: dumpgame.c,v 1.6 1998/09/11 14:26:19 hubertf Exp $");
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#endif
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#endif /* not lint */
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#include <stdio.h>
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#include <err.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "trek.h"
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/*** THIS CONSTANT MUST CHANGE AS THE DATA SPACES CHANGE ***/
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# define VERSION 2
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struct dump
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{
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char *area;
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int count;
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};
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static int readdump __P((int));
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struct dump Dump_template[] =
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{
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{ (char *)&Ship, sizeof (Ship) },
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{ (char *)&Now, sizeof (Now) },
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{ (char *)&Param, sizeof (Param) },
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{ (char *)&Etc, sizeof (Etc) },
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{ (char *)&Game, sizeof (Game) },
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{ (char *)Sect, sizeof (Sect) },
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{ (char *)Quad, sizeof (Quad) },
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{ (char *)&Move, sizeof (Move) },
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{ (char *)Event, sizeof (Event) },
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{ NULL, 0 }
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};
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/*
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** DUMP GAME
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**
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** This routine dumps the game onto the file "trek.dump". The
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** first two bytes of the file are a version number, which
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** reflects whether this image may be used. Obviously, it must
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** change as the size, content, or order of the data structures
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** output change.
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*/
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/*ARGSUSED*/
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void
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dumpgame(v)
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int v __attribute__((unused));
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{
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int version;
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int fd;
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struct dump *d;
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int i;
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if ((fd = creat("trek.dump", 0644)) < 0) {
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warn("cannot open `trek.dump'");
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return;
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}
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version = VERSION;
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write(fd, &version, sizeof version);
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/* output the main data areas */
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for (d = Dump_template; d->area; d++)
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{
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write(fd, &d->area, sizeof d->area);
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i = d->count;
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write(fd, d->area, i);
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}
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close(fd);
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}
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/*
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** RESTORE GAME
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**
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** The game is restored from the file "trek.dump". In order for
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** this to succeed, the file must exist and be readable, must
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** have the correct version number, and must have all the appro-
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** priate data areas.
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**
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** Return value is zero for success, one for failure.
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*/
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int
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restartgame()
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{
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int fd;
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int version;
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if ((fd = open("trek.dump", O_RDONLY)) < 0 ||
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read(fd, &version, sizeof version) != sizeof version ||
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version != VERSION ||
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readdump(fd))
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{
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printf("cannot restart\n");
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close(fd);
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return (1);
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}
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close(fd);
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return (0);
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}
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/*
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** READ DUMP
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**
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** This is the business end of restartgame(). It reads in the
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** areas.
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**
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** Returns zero for success, one for failure.
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*/
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static int
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readdump(fd1)
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int fd1;
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{
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int fd;
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struct dump *d;
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int i;
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long junk;
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fd = fd1;
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for (d = Dump_template; d->area; d++)
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{
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if (read(fd, &junk, sizeof junk) != (sizeof junk))
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return (1);
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if ((char *)junk != d->area)
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return (1);
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i = d->count;
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if (read(fd, d->area, i) != i)
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return (1);
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}
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/* make quite certain we are at EOF */
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return (read(fd, &junk, 1));
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}
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