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- /*
- * Copyright (c) 1980 Regents of the University of California.
- * All rights reserved.
- *
- * 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.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)dumpgame.c 4.6 (Berkeley) 6/1/90";
- #endif /* not lint */
-
- # include "trek.h"
-
- /*** THIS CONSTANT MUST CHANGE AS THE DATA SPACES CHANGE ***/
- # define VERSION 2
-
- struct dump
- {
- char *area;
- int count;
- };
-
-
- struct dump Dump_template[] =
- {
- (char *)&Ship, sizeof (Ship),
- (char *)&Now, sizeof (Now),
- (char *)&Param, sizeof (Param),
- (char *)&Etc, sizeof (Etc),
- (char *)&Game, sizeof (Game),
- (char *)Sect, sizeof (Sect),
- (char *)Quad, sizeof (Quad),
- (char *)&Move, sizeof (Move),
- (char *)Event, sizeof (Event),
- 0
- };
-
- /*
- ** DUMP GAME
- **
- ** This routine dumps the game onto the file "trek.dump". The
- ** first two bytes of the file are a version number, which
- ** reflects whether this image may be used. Obviously, it must
- ** change as the size, content, or order of the data structures
- ** output change.
- */
-
- dumpgame()
- {
- int version;
- register int fd;
- register struct dump *d;
- register int i;
-
- if ((fd = creat("trek.dump", 0644)) < 0)
- return (printf("cannot dump\n"));
- version = VERSION;
- write(fd, &version, sizeof version);
-
- /* output the main data areas */
- for (d = Dump_template; d->area; d++)
- {
- write(fd, &d->area, sizeof d->area);
- i = d->count;
- write(fd, d->area, i);
- }
-
- close(fd);
- }
-
-
- /*
- ** RESTORE GAME
- **
- ** The game is restored from the file "trek.dump". In order for
- ** this to succeed, the file must exist and be readable, must
- ** have the correct version number, and must have all the appro-
- ** priate data areas.
- **
- ** Return value is zero for success, one for failure.
- */
-
- restartgame()
- {
- register int fd;
- int version;
-
- if ((fd = open("trek.dump", 0)) < 0 ||
- read(fd, &version, sizeof version) != sizeof version ||
- version != VERSION ||
- readdump(fd))
- {
- printf("cannot restart\n");
- close(fd);
- return (1);
- }
-
- close(fd);
- return (0);
- }
-
-
- /*
- ** READ DUMP
- **
- ** This is the business end of restartgame(). It reads in the
- ** areas.
- **
- ** Returns zero for success, one for failure.
- */
-
- readdump(fd1)
- int fd1;
- {
- register int fd;
- register struct dump *d;
- register int i;
- int junk;
-
- fd = fd1;
-
- for (d = Dump_template; d->area; d++)
- {
- if (read(fd, &junk, sizeof junk) != (sizeof junk))
- return (1);
- if ((char *)junk != d->area)
- return (1);
- i = d->count;
- if (read(fd, d->area, i) != i)
- return (1);
- }
-
- /* make quite certain we are at EOF */
- return (read(fd, &junk, 1));
- }
-