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. 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 1.3 2006/09/07 21:19:44 pavalos Exp $ 36 */ 37 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 45 struct dump 46 { 47 char *area; 48 int count; 49 }; 50 51 52 struct 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 { NULL, 0 } 64 }; 65 66 static bool readdump(int); 67 68 /* 69 ** DUMP GAME 70 ** 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 75 ** output change. 76 */ 77 78 void 79 dumpgame(__unused int unused) 80 { 81 int version; 82 int fd; 83 struct dump *d; 84 int i; 85 86 if ((fd = creat("trek.dump", 0644)) < 0) { 87 printf("cannot dump\n"); 88 return; 89 } 90 version = VERSION; 91 write(fd, &version, sizeof version); 92 93 /* output the main data areas */ 94 for (d = Dump_template; d->area; d++) 95 { 96 write(fd, &d->area, sizeof d->area); 97 i = d->count; 98 write(fd, d->area, i); 99 } 100 101 close(fd); 102 } 103 104 105 /* 106 ** RESTORE GAME 107 ** 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. 112 ** 113 ** Return value is zero for success, one for failure. 114 */ 115 116 bool 117 restartgame(void) 118 { 119 int fd; 120 int version; 121 122 if ((fd = open("trek.dump", O_RDONLY)) < 0 || 123 read(fd, &version, sizeof version) != sizeof version || 124 version != VERSION || 125 readdump(fd)) 126 { 127 printf("cannot restart\n"); 128 close(fd); 129 return (1); 130 } 131 132 close(fd); 133 return (0); 134 } 135 136 137 /* 138 ** READ DUMP 139 ** 140 ** This is the business end of restartgame(). It reads in the 141 ** areas. 142 ** 143 ** Returns zero for success, one for failure. 144 */ 145 146 static bool 147 readdump(int fd1) 148 { 149 int fd; 150 struct dump *d; 151 int i; 152 long junk; 153 154 fd = fd1; 155 156 for (d = Dump_template; d->area; d++) 157 { 158 if (read(fd, &junk, sizeof junk) != (sizeof junk)) 159 return (1); 160 if ((char *)junk != d->area) 161 return (1); 162 i = d->count; 163 if (read(fd, d->area, i) != i) 164 return (1); 165 } 166 167 /* make quite certain we are at EOF */ 168 return (read(fd, &junk, 1)); 169 } 170