Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / games / trek / dumpgame.c
CommitLineData
984263bc
MD
1/*
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
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.
1de703da
MD
32 *
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 1.2 2003/06/17 04:25:25 dillon Exp $
984263bc
MD
36 */
37
984263bc
MD
38#include <fcntl.h>
39
40# include "trek.h"
41
42/*** THIS CONSTANT MUST CHANGE AS THE DATA SPACES CHANGE ***/
43# define VERSION 2
44
45struct dump
46{
47 char *area;
48 int count;
49};
50
51
52struct dump Dump_template[] =
53{
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),
63 0
64};
65
66/*
67** DUMP GAME
68**
69** This routine dumps the game onto the file "trek.dump". The
70** first two bytes of the file are a version number, which
71** reflects whether this image may be used. Obviously, it must
72** change as the size, content, or order of the data structures
73** output change.
74*/
75
76dumpgame()
77{
78 int version;
79 int fd;
80 struct dump *d;
81 int i;
82
83 if ((fd = creat("trek.dump", 0644)) < 0)
84 return (printf("cannot dump\n"));
85 version = VERSION;
86 write(fd, &version, sizeof version);
87
88 /* output the main data areas */
89 for (d = Dump_template; d->area; d++)
90 {
91 write(fd, &d->area, sizeof d->area);
92 i = d->count;
93 write(fd, d->area, i);
94 }
95
96 close(fd);
97}
98
99
100/*
101** RESTORE GAME
102**
103** The game is restored from the file "trek.dump". In order for
104** this to succeed, the file must exist and be readable, must
105** have the correct version number, and must have all the appro-
106** priate data areas.
107**
108** Return value is zero for success, one for failure.
109*/
110
111restartgame()
112{
113 int fd;
114 int version;
115
116 if ((fd = open("trek.dump", O_RDONLY)) < 0 ||
117 read(fd, &version, sizeof version) != sizeof version ||
118 version != VERSION ||
119 readdump(fd))
120 {
121 printf("cannot restart\n");
122 close(fd);
123 return (1);
124 }
125
126 close(fd);
127 return (0);
128}
129
130
131/*
132** READ DUMP
133**
134** This is the business end of restartgame(). It reads in the
135** areas.
136**
137** Returns zero for success, one for failure.
138*/
139
140readdump(fd1)
141int fd1;
142{
143 int fd;
144 struct dump *d;
145 int i;
146 long junk;
147
148 fd = fd1;
149
150 for (d = Dump_template; d->area; d++)
151 {
152 if (read(fd, &junk, sizeof junk) != (sizeof junk))
153 return (1);
154 if ((char *)junk != d->area)
155 return (1);
156 i = d->count;
157 if (read(fd, d->area, i) != i)
158 return (1);
159 }
160
161 /* make quite certain we are at EOF */
162 return (read(fd, &junk, 1));
163}