NetBSD/games/sail/sync.c

503 lines
9.8 KiB
C

/* $NetBSD: sync.c,v 1.24 2006/05/18 18:42:59 mrg Exp $ */
/*
* Copyright (c) 1983, 1993
* The 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)sync.c 8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: sync.c,v 1.24 2006/05/18 18:42:59 mrg Exp $");
#endif
#endif /* not lint */
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "extern.h"
#include "pathnames.h"
#define BUFSIZE 4096
static int sync_update(int, struct ship *, const char *, long, long, long, long);
static const char SF[] = _PATH_SYNC;
static const char LF[] = _PATH_LOCK;
static char sync_buf[BUFSIZE];
static char *sync_bp = sync_buf;
static char sync_lock[sizeof SF];
static char sync_file[sizeof LF];
static long sync_seek;
static FILE *sync_fp;
void
fmtship(char *buf, size_t len, const char *fmt, struct ship *ship)
{
while (*fmt) {
if (len-- == 0) {
*buf = '\0';
return;
}
if (*fmt == '$' && fmt[1] == '$') {
size_t l = snprintf(buf, len, "%s (%c%c)",
ship->shipname, colours(ship), sterncolour(ship));
buf += l;
len -= l - 1;
fmt += 2;
}
else
*buf++ = *fmt++;
}
if (len > 0)
*buf = '\0';
}
/*VARARGS3*/
void
makesignal(struct ship *from, const char *fmt, struct ship *ship, ...)
{
char message[BUFSIZ];
char format[BUFSIZ];
va_list ap;
va_start(ap, ship);
fmtship(format, sizeof(format), fmt, ship);
vsprintf(message, format, ap);
va_end(ap);
Writestr(W_SIGNAL, from, message);
}
/*VARARGS2*/
void
makemsg(struct ship *from, const char *fmt, ...)
{
char message[BUFSIZ];
va_list ap;
va_start(ap, fmt);
vsprintf(message, fmt, ap);
va_end(ap);
Writestr(W_SIGNAL, from, message);
}
int
sync_exists(int game)
{
char buf[sizeof sync_file];
struct stat s;
time_t t;
sprintf(buf, SF, game);
time(&t);
setegid(egid);
if (stat(buf, &s) < 0) {
setegid(gid);
return 0;
}
if (s.st_mtime < t - 60*60*2) { /* 2 hours */
unlink(buf);
sprintf(buf, LF, game);
unlink(buf);
setegid(gid);
return 0;
} else {
setegid(gid);
return 1;
}
}
int
sync_open(void)
{
struct stat tmp;
if (sync_fp != NULL)
fclose(sync_fp);
sprintf(sync_lock, LF, game);
sprintf(sync_file, SF, game);
setegid(egid);
if (stat(sync_file, &tmp) < 0) {
mode_t omask = umask(002);
sync_fp = fopen(sync_file, "w+");
umask(omask);
} else
sync_fp = fopen(sync_file, "r+");
setegid(gid);
if (sync_fp == NULL)
return -1;
sync_seek = 0;
return 0;
}
void
sync_close(int remove)
{
if (sync_fp != 0)
fclose(sync_fp);
if (remove) {
setegid(egid);
unlink(sync_file);
setegid(gid);
}
}
void
Write(int type, struct ship *ship, long a, long b, long c, long d)
{
sprintf(sync_bp, "%d %d 0 %ld %ld %ld %ld\n",
type, ship->file->index, a, b, c, d);
while (*sync_bp++)
;
sync_bp--;
if (sync_bp >= &sync_buf[sizeof sync_buf])
abort();
sync_update(type, ship, NULL, a, b, c, d);
}
void
Writestr(int type, struct ship *ship, const char *a)
{
sprintf(sync_bp, "%d %d 1 %s\n", type, ship->file->index, a);
while (*sync_bp++)
;
sync_bp--;
if (sync_bp >= &sync_buf[sizeof sync_buf])
abort();
sync_update(type, ship, a, 0, 0, 0, 0);
}
int
Sync(void)
{
sig_t sighup, sigint;
int n;
int type, shipnum, isstr;
char *astr;
long a, b, c, d;
char buf[80];
char erred = 0;
sighup = signal(SIGHUP, SIG_IGN);
sigint = signal(SIGINT, SIG_IGN);
for (n = TIMEOUT; --n >= 0;) {
#ifdef LOCK_EX
if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
break;
if (errno != EWOULDBLOCK)
return -1;
#else
setegid(egid);
if (link(sync_file, sync_lock) >= 0) {
setegid(gid);
break;
}
setegid(gid);
if (errno != EEXIST)
return -1;
#endif
sleep(1);
}
if (n <= 0)
return -1;
fseek(sync_fp, sync_seek, SEEK_SET);
for (;;) {
switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
case 3:
break;
case EOF:
goto out;
default:
goto bad;
}
if (shipnum < 0 || shipnum >= cc->vessels)
goto bad;
if (isstr != 0 && isstr != 1)
goto bad;
if (isstr) {
int c;
char *p;
for (p = buf;;) {
c = getc(sync_fp);
*p++ = (char)c;
switch (c) {
case '\n':
p--;
case EOF:
break;
default:
if (p >= buf + sizeof buf)
p--;
continue;
}
break;
}
*p = 0;
for (p = buf; *p == ' '; p++)
;
astr = p;
a = b = c = d = 0;
} else {
if (fscanf(sync_fp, "%ld%ld%ld%ld", &a, &b, &c, &d) != 4)
goto bad;
astr = NULL;
}
if (sync_update(type, SHIP(shipnum), astr, a, b, c, d) < 0)
goto bad;
}
bad:
erred++;
out:
if (!erred && sync_bp != sync_buf) {
fseek(sync_fp, 0L, SEEK_END);
fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
sync_fp);
fflush(sync_fp);
sync_bp = sync_buf;
}
sync_seek = ftell(sync_fp);
#ifdef LOCK_EX
flock(fileno(sync_fp), LOCK_UN);
#else
setegid(egid);
unlink(sync_lock);
setegid(gid);
#endif
signal(SIGHUP, sighup);
signal(SIGINT, sigint);
return erred ? -1 : 0;
}
static int
sync_update(int type, struct ship *ship, const char *astr, long a, long b, long c, long d)
{
switch (type) {
case W_DBP: {
struct BP *p = &ship->file->DBP[a];
p->turnsent = b;
p->toship = SHIP(c);
p->mensent = d;
break;
}
case W_OBP: {
struct BP *p = &ship->file->OBP[a];
p->turnsent = b;
p->toship = SHIP(c);
p->mensent = d;
break;
}
case W_FOUL: {
struct snag *p = &ship->file->foul[a];
if (SHIP(a)->file->dir == 0)
break;
if (p->sn_count++ == 0)
p->sn_turn = turn;
ship->file->nfoul++;
break;
}
case W_GRAP: {
struct snag *p = &ship->file->grap[a];
if (SHIP(a)->file->dir == 0)
break;
if (p->sn_count++ == 0)
p->sn_turn = turn;
ship->file->ngrap++;
break;
}
case W_UNFOUL: {
struct snag *p = &ship->file->foul[a];
if (p->sn_count > 0) {
if (b) {
ship->file->nfoul -= p->sn_count;
p->sn_count = 0;
} else {
ship->file->nfoul--;
p->sn_count--;
}
}
break;
}
case W_UNGRAP: {
struct snag *p = &ship->file->grap[a];
if (p->sn_count > 0) {
if (b) {
ship->file->ngrap -= p->sn_count;
p->sn_count = 0;
} else {
ship->file->ngrap--;
p->sn_count--;
}
}
break;
}
case W_SIGNAL:
if (mode == MODE_PLAYER) {
if (nobells)
Signal("$$: %s", ship, astr);
else
Signal("\7$$: %s", ship, astr);
}
break;
case W_CREW: {
struct shipspecs *s = ship->specs;
s->crew1 = a;
s->crew2 = b;
s->crew3 = c;
break;
}
case W_CAPTAIN:
strlcpy(ship->file->captain, astr,
sizeof ship->file->captain);
break;
case W_CAPTURED:
if (a < 0)
ship->file->captured = 0;
else
ship->file->captured = SHIP(a);
break;
case W_CLASS:
ship->specs->class = a;
break;
case W_DRIFT:
ship->file->drift = a;
break;
case W_EXPLODE:
if ((ship->file->explode = a) == 2)
ship->file->dir = 0;
break;
case W_FS:
ship->file->FS = a;
break;
case W_GUNL: {
struct shipspecs *s = ship->specs;
s->gunL = a;
s->carL = b;
break;
}
case W_GUNR: {
struct shipspecs *s = ship->specs;
s->gunR = a;
s->carR = b;
break;
}
case W_HULL:
ship->specs->hull = a;
break;
case W_MOVE:
strlcpy(ship->file->movebuf, astr,
sizeof ship->file->movebuf);
break;
case W_PCREW:
ship->file->pcrew = a;
break;
case W_POINTS:
ship->file->points = a;
break;
case W_QUAL:
ship->specs->qual = a;
break;
case W_RIGG: {
struct shipspecs *s = ship->specs;
s->rig1 = a;
s->rig2 = b;
s->rig3 = c;
s->rig4 = d;
break;
}
case W_RIG1:
ship->specs->rig1 = a;
break;
case W_RIG2:
ship->specs->rig2 = a;
break;
case W_RIG3:
ship->specs->rig3 = a;
break;
case W_RIG4:
ship->specs->rig4 = a;
break;
case W_COL:
ship->file->col = a;
break;
case W_DIR:
ship->file->dir = a;
break;
case W_ROW:
ship->file->row = a;
break;
case W_SINK:
if ((ship->file->sink = a) == 2)
ship->file->dir = 0;
break;
case W_STRUCK:
ship->file->struck = a;
break;
case W_TA:
ship->specs->ta = a;
break;
case W_ALIVE:
alive = 1;
break;
case W_TURN:
turn = a;
break;
case W_WIND:
winddir = a;
windspeed = b;
break;
case W_BEGIN:
strcpy(ship->file->captain, "begin");
people++;
break;
case W_END:
*ship->file->captain = 0;
ship->file->points = 0;
people--;
break;
case W_DDEAD:
hasdriver = 0;
break;
default:
fprintf(stderr, "sync_update: unknown type %d\r\n", type);
return -1;
}
return 0;
}