* Copyright (c) 1980 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
static char sccsid
[] = "@(#)dumpgame.c 4.4 (Berkeley) %G%";
/*** THIS CONSTANT MUST CHANGE AS THE DATA SPACES CHANGE ***/
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
),
** 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
if ((fd
= creat("trek.dump", 0644)) < 0)
return (printf("cannot dump\n"));
write(fd
, &version
, sizeof version
);
/* output the main data areas */
for (d
= Dump_template
; d
->area
; d
++)
write(fd
, &d
->area
, sizeof d
->area
);
** 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-
** Return value is zero for success, one for failure.
if ((fd
= open("trek.dump", 0)) < 0 ||
read(fd
, &version
, sizeof version
) != sizeof version
||
printf("cannot restart\n");
** This is the business end of restartgame(). It reads in the
** Returns zero for success, one for failure.
for (d
= Dump_template
; d
->area
; d
++)
if (read(fd
, &junk
, sizeof junk
) != (sizeof junk
))
if ((char *)junk
!= d
->area
)
if (read(fd
, d
->area
, i
) != i
)
/* make quite certain we are at EOF */
return (read(fd
, &junk
, 1));