[unix-history] / .ref-BSD-4_3_Reno / 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 are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#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	*
1c15e888 C	5	* Redistribution and use in source and binary forms are permitted provided
	6	* that: (1) source distributions retain this entire copyright notice and
	7	* comment, and (2) distributions including binaries display the following
	8	* acknowledgement: ``This product includes software developed by the
	9	* University of California, Berkeley and its contributors'' in the
	10	* documentation or other materials provided with the distribution and in
	11	* all advertising materials mentioning features or use of this software.
	12	* Neither the name of the University nor the names of its contributors may
	13	* be used to endorse or promote products derived from this software without
	14	* specific prior written permission.
	15	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
	16	* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
	17	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
9758240b KM	18	*/
9758240b KM	19
1184f029	20	#ifndef lint
1c15e888	21	static char sccsid[] = "@(#)dumpgame.c 4.6 (Berkeley) 6/1/90";
e9fb6bea	22	#endif /* not lint */
1184f029 KM	23
	24	# include "trek.h"
	25
	26	/* THIS CONSTANT MUST CHANGE AS THE DATA SPACES CHANGE */
401a08c7	27	# define VERSION 2
1184f029 KM	28
	29	struct dump
	30	{
	31	char *area;
	32	int count;
	33	};
	34
401a08c7 KL	35
401a08c7 KL	36	struct dump Dump_template[] =
1184f029	37	{
401a08c7 KL	38	(char *)&Ship, sizeof (Ship),
	39	(char *)&Now, sizeof (Now),
	40	(char *)&Param, sizeof (Param),
	41	(char *)&Etc, sizeof (Etc),
	42	(char *)&Game, sizeof (Game),
	43	(char *)Sect, sizeof (Sect),
	44	(char *)Quad, sizeof (Quad),
	45	(char *)&Move, sizeof (Move),
	46	(char *)Event, sizeof (Event),
1184f029 KM	47	0
	48	};
	49
	50	/*
	51	** DUMP GAME
	52	**
	53	** This routine dumps the game onto the file "trek.dump". The
	54	** first two bytes of the file are a version number, which
	55	** reflects whether this image may be used. Obviously, it must
	56	** change as the size, content, or order of the data structures
	57	** output change.
	58	*/
	59
	60	dumpgame()
	61	{
	62	int version;
	63	register int fd;
	64	register struct dump *d;
	65	register int i;
	66
	67	if ((fd = creat("trek.dump", 0644)) < 0)
	68	return (printf("cannot dump\n"));
	69	version = VERSION;
	70	write(fd, &version, sizeof version);
	71
	72	/* output the main data areas */
	73	for (d = Dump_template; d->area; d++)
	74	{
	75	write(fd, &d->area, sizeof d->area);
	76	i = d->count;
	77	write(fd, d->area, i);
	78	}
	79
	80	close(fd);
	81	}
	82
	83
	84	/*
	85	** RESTORE GAME
	86	**
	87	** The game is restored from the file "trek.dump". In order for
	88	** this to succeed, the file must exist and be readable, must
	89	** have the correct version number, and must have all the appro-
	90	** priate data areas.
	91	**
	92	** Return value is zero for success, one for failure.
	93	*/
	94
	95	restartgame()
	96	{
	97	register int fd;
	98	int version;
	99
	100	if ((fd = open("trek.dump", 0)) < 0 \|\|
	101	read(fd, &version, sizeof version) != sizeof version \|\|
	102	version != VERSION \|\|
	103	readdump(fd))
	104	{
	105	printf("cannot restart\n");
	106	close(fd);
	107	return (1);
	108	}
	109
	110	close(fd);
111	return (0);
112	}
113
114
115	/*
116	** READ DUMP
117	**
118	** This is the business end of restartgame(). It reads in the
119	** areas.
120	**
121	** Returns zero for success, one for failure.
122	*/
123
124	readdump(fd1)
125	int fd1;
126	{
127	register int fd;
128	register struct dump *d;
129	register int i;
130	int junk;
131
132	fd = fd1;
133
134	for (d = Dump_template; d->area; d++)
135	{
401a08c7	136	if (read(fd, &junk, sizeof junk) != (sizeof junk))
1184f029	137	return (1);
401a08c7	138	if ((char *)junk != d->area)
1184f029 KM	139	return (1);
	140	i = d->count;
	141	if (read(fd, d->area, i) != i)
	142	return (1);
	143	}
	144
	145	/* make quite certain we are at EOF */
	146	return (read(fd, &junk, 1));
	147	}