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33 * @(#)dumpgame.c 8.1 (Berkeley) 5/31/93
34 * $FreeBSD: src/games/trek/dumpgame.c,v 1.6 1999/11/30 03:49:46 billf Exp $
35 * $DragonFly: src/games/trek/dumpgame.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
42 /*** THIS CONSTANT MUST CHANGE AS THE DATA SPACES CHANGE ***/
52 struct dump Dump_template[] =
54 { (char *)&Ship, sizeof (Ship) },
55 { (char *)&Now, sizeof (Now) },
56 { (char *)&Param, sizeof (Param) },
57 { (char *)&Etc, sizeof (Etc) },
58 { (char *)&Game, sizeof (Game) },
59 { (char *)Sect, sizeof (Sect) },
60 { (char *)Quad, sizeof (Quad) },
61 { (char *)&Move, sizeof (Move) },
62 { (char *)Event, sizeof (Event) },
66 static bool readdump(int);
71 ** This routine dumps the game onto the file "trek.dump". The
72 ** first two bytes of the file are a version number, which
73 ** reflects whether this image may be used. Obviously, it must
74 ** change as the size, content, or order of the data structures
79 dumpgame(__unused int unused)
86 if ((fd = creat("trek.dump", 0644)) < 0) {
87 printf("cannot dump\n");
91 write(fd, &version, sizeof version);
93 /* output the main data areas */
94 for (d = Dump_template; d->area; d++)
96 write(fd, &d->area, sizeof d->area);
98 write(fd, d->area, i);
108 ** The game is restored from the file "trek.dump". In order for
109 ** this to succeed, the file must exist and be readable, must
110 ** have the correct version number, and must have all the appro-
111 ** priate data areas.
113 ** Return value is zero for success, one for failure.
122 if ((fd = open("trek.dump", O_RDONLY)) < 0 ||
123 read(fd, &version, sizeof version) != sizeof version ||
124 version != VERSION ||
127 printf("cannot restart\n");
140 ** This is the business end of restartgame(). It reads in the
143 ** Returns zero for success, one for failure.
156 for (d = Dump_template; d->area; d++)
158 if (read(fd, &junk, sizeof junk) != (sizeof junk))
160 if ((char *)junk != d->area)
163 if (read(fd, d->area, i) != i)
167 /* make quite certain we are at EOF */
168 return (read(fd, &junk, 1));