From 77e3814f0c0e3dea4d0032e25666f77e6f83bfff Mon Sep 17 00:00:00 2001 From: cgd Date: Sun, 21 Mar 1993 09:45:37 +0000 Subject: initial import of 386bsd-0.1 sources --- trek/dumpgame.c | 161 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 161 insertions(+) create mode 100644 trek/dumpgame.c (limited to 'trek/dumpgame.c') diff --git a/trek/dumpgame.c b/trek/dumpgame.c new file mode 100644 index 00000000..51842072 --- /dev/null +++ b/trek/dumpgame.c @@ -0,0 +1,161 @@ +/* + * Copyright (c) 1980 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#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)); +} -- cgit v1.2.3-56-ge451