[unix-history] / .ref-BSD-4_3_Net_2 / usr / src / games / trek / dumpgame.c

/*
 * 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));
}
Commit	Line	Data
9758240b KM	1	/*
9758240b KM	2	* Copyright (c) 1980 Regents of the University of California.
e9fb6bea KB	3	* All rights reserved.
e9fb6bea KB	4	*
af359dea C	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
9758240b KM	32	*/
9758240b KM	33
1184f029	34	#ifndef lint
1c15e888	35	static char sccsid[] = "@(#)dumpgame.c 4.6 (Berkeley) 6/1/90";
e9fb6bea	36	#endif /* not lint */
1184f029 KM	37
	38	# include "trek.h"
	39
	40	/* THIS CONSTANT MUST CHANGE AS THE DATA SPACES CHANGE */
401a08c7	41	# define VERSION 2
1184f029 KM	42
	43	struct dump
	44	{
	45	char *area;
	46	int count;
	47	};
	48
401a08c7 KL	49
401a08c7 KL	50	struct dump Dump_template[] =
1184f029	51	{
401a08c7 KL	52	(char *)&Ship, sizeof (Ship),
	53	(char *)&Now, sizeof (Now),
	54	(char *)&Param, sizeof (Param),
	55	(char *)&Etc, sizeof (Etc),
	56	(char *)&Game, sizeof (Game),
	57	(char *)Sect, sizeof (Sect),
	58	(char *)Quad, sizeof (Quad),
	59	(char *)&Move, sizeof (Move),
	60	(char *)Event, sizeof (Event),
1184f029 KM	61	0
	62	};
	63
	64	/*
	65	** DUMP GAME
	66	**
	67	** This routine dumps the game onto the file "trek.dump". The
	68	** first two bytes of the file are a version number, which
	69	** reflects whether this image may be used. Obviously, it must
	70	** change as the size, content, or order of the data structures
	71	** output change.
	72	*/
	73
	74	dumpgame()
	75	{
	76	int version;
	77	register int fd;
	78	register struct dump *d;
	79	register int i;
	80
	81	if ((fd = creat("trek.dump", 0644)) < 0)
	82	return (printf("cannot dump\n"));
	83	version = VERSION;
	84	write(fd, &version, sizeof version);
	85
	86	/* output the main data areas */
	87	for (d = Dump_template; d->area; d++)
	88	{
	89	write(fd, &d->area, sizeof d->area);
	90	i = d->count;
	91	write(fd, d->area, i);
	92	}
	93
	94	close(fd);
	95	}
	96
	97
	98	/*
	99	** RESTORE GAME
	100	**
	101	** The game is restored from the file "trek.dump". In order for
	102	** this to succeed, the file must exist and be readable, must
	103	** have the correct version number, and must have all the appro-
	104	** priate data areas.
	105	**
	106	** Return value is zero for success, one for failure.
	107	*/
	108
	109	restartgame()
	110	{
	111	register int fd;
	112	int version;
	113
	114	if ((fd = open("trek.dump", 0)) < 0 \|\|
	115	read(fd, &version, sizeof version) != sizeof version \|\|
	116	version != VERSION \|\|
	117	readdump(fd))
	118	{
	119	printf("cannot restart\n");
	120	close(fd);
	121	return (1);
	122	}
	123
	124	close(fd);
125	return (0);
126	}
127
128
129	/*
130	** READ DUMP
131	**
132	** This is the business end of restartgame(). It reads in the
133	** areas.
134	**
135	** Returns zero for success, one for failure.
136	*/
137
138	readdump(fd1)
139	int fd1;
140	{
141	register int fd;
142	register struct dump *d;
143	register int i;
144	int junk;
145
146	fd = fd1;
147
148	for (d = Dump_template; d->area; d++)
149	{
401a08c7	150	if (read(fd, &junk, sizeof junk) != (sizeof junk))
1184f029	151	return (1);
401a08c7	152	if ((char *)junk != d->area)
1184f029 KM	153	return (1);
	154	i = d->count;
	155	if (read(fd, d->area, i) != i)
	156	return (1);
	157	}
	158
	159	/* make quite certain we are at EOF */
	160	return (read(fd, &junk, 1));
	161	}