[unix-history] / usr / src / games / sail / sync.c

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)sync.c	8.2 (Berkeley) %G%";
#endif /* not lint */

#include <sys/file.h>
#include <errno.h>
#include "extern.h"

#define BUFSIZE 4096

static char sync_buf[BUFSIZE];
static char *sync_bp = sync_buf;
static char sync_lock[25];
static char sync_file[25];
static long sync_seek;
static FILE *sync_fp;
#define SF "/tmp/#sailsink.%d"
#define LF "/tmp/#saillock.%d"

/*VARARGS3*/
makesignal(from, fmt, ship, a, b, c)
	struct ship *from;
	char *fmt;
	register struct ship *ship;
{
	char message[80];

	if (ship == 0)
		(void) sprintf(message, fmt, a, b, c);
	else
		(void) sprintf(message, fmt,
			ship->shipname, colours(ship),
			sterncolour(ship), a, b, c);
	Write(W_SIGNAL, from, 1, (int)message, 0, 0, 0);
}

#include <sys/types.h>
#include <sys/stat.h>
sync_exists(game)
{
	char buf[sizeof sync_file];
	struct stat s;
	time_t t;

	(void) sprintf(buf, SF, game);
	(void) time(&t);
	if (stat(buf, &s) < 0)
		return 0;
	if (s.st_mtime < t - 60*60*2) {		/* 2 hours */
		(void) unlink(buf);
		(void) sprintf(buf, LF, game);
		(void) unlink(buf);
		return 0;
	} else
		return 1;
}

sync_open()
{
	if (sync_fp != NULL)
		(void) fclose(sync_fp);
	(void) sprintf(sync_lock, LF, game);
	(void) sprintf(sync_file, SF, game);
	if (access(sync_file, 0) < 0) {
		int omask = umask(issetuid ? 077 : 011);
		sync_fp = fopen(sync_file, "w+");
		(void) umask(omask);
	} else
		sync_fp = fopen(sync_file, "r+");
	if (sync_fp == NULL)
		return -1;
	sync_seek = 0;
	return 0;
}

sync_close(remove)
	char remove;
{
	if (sync_fp != 0)
		(void) fclose(sync_fp);
	if (remove)
		(void) unlink(sync_file);
}

Write(type, ship, isstr, a, b, c, d)
	int type;
	struct ship *ship;
	char isstr;
	int a, b, c, d;
{
	if (isstr)
		(void) sprintf(sync_bp, "%d %d %d %s\n",
			type, ship->file->index, isstr, a);
	else
		(void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
			type, ship->file->index, isstr, a, b, c, d);
	while (*sync_bp++)
		;
	sync_bp--;
	if (sync_bp >= &sync_buf[sizeof sync_buf])
		abort();
	(void) sync_update(type, ship, a, b, c, d);
}

Sync()
{
	sig_t sighup, sigint;
	register n;
	int type, shipnum, isstr, a, b, c, d;
	char buf[80];
	char erred = 0;
	extern errno;

	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
		if (link(sync_file, sync_lock) >= 0)
			break;
		if (errno != EEXIST)
			return -1;
#endif
		sleep(1);
	}
	if (n <= 0)
		return -1;
	(void) fseek(sync_fp, sync_seek, 0);
	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) {
			register char *p;
			for (p = buf;;) {
				switch (*p++ = getc(sync_fp)) {
				case '\n':
					p--;
				case EOF:
					break;
				default:
					if (p >= buf + sizeof buf)
						p--;
					continue;
				}
				break;
			}
			*p = 0;
			for (p = buf; *p == ' '; p++)
				;
			a = (int)p;
			b = c = d = 0;
		} else
			if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
				goto bad;
		if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
			goto bad;
	}
bad:
	erred++;
out:
	if (!erred && sync_bp != sync_buf) {
		(void) fseek(sync_fp, 0L, 2);
		(void) fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
			sync_fp);
		(void) fflush(sync_fp);
		sync_bp = sync_buf;
	}
	sync_seek = ftell(sync_fp);
#ifdef LOCK_EX
	(void) flock(fileno(sync_fp), LOCK_UN);
#else
	(void) unlink(sync_lock);
#endif
	(void) signal(SIGHUP, sighup);
	(void) signal(SIGINT, sigint);
	return erred ? -1 : 0;
}

sync_update(type, ship, a, b, c, d)
	int type;
	register struct ship *ship;
	int a, b, c, d;
{
	switch (type) {
	case W_DBP: {
		register struct BP *p = &ship->file->DBP[a];
		p->turnsent = b;
		p->toship = SHIP(c);
		p->mensent = d;
		break;
		}
	case W_OBP: {
		register struct BP *p = &ship->file->OBP[a];
		p->turnsent = b;
		p->toship = SHIP(c);
		p->mensent = d;
		break;
		}
	case W_FOUL: {
		register 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: {
		register 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: {
		register 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: {
		register 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 (%c%c): %s", ship, a);
			else
				Signal("\7%s (%c%c): %s", ship, a);
		break;
	case W_CREW: {
		register struct shipspecs *s = ship->specs;
		s->crew1 = a;
		s->crew2 = b;
		s->crew3 = c;
		break;
		}
	case W_CAPTAIN:
		(void) strncpy(ship->file->captain, (char *)a,
			sizeof ship->file->captain - 1);
		ship->file->captain[sizeof ship->file->captain - 1] = 0;
		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: {
		register struct shipspecs *s = ship->specs;
		s->gunL = a;
		s->carL = b;
		break;
		}
	case W_GUNR: {
		register struct shipspecs *s = ship->specs;
		s->gunR = a;
		s->carR = b;
		break;
		}
	case W_HULL:
		ship->specs->hull = a;
		break;
	case W_MOVE:
		(void) strncpy(ship->file->movebuf, (char *)a,
			sizeof ship->file->movebuf - 1);
		ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
		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: {
		register 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:
		(void) 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;
}
Commit	Line	Data
b5f0675e	1	/*
02cf2247 KB	2	* Copyright (c) 1983, 1993
02cf2247 KB	3	* The Regents of the University of California. All rights reserved.
c0ca48ec	4	*
b2e7427f	5	* %sccs.include.redist.c%
b5f0675e EW	6	*/
b5f0675e EW	7
15e30c53	8	#ifndef lint
1833b448	9	static char sccsid[] = "@(#)sync.c 8.2 (Berkeley) %G%";
c0ca48ec	10	#endif /* not lint */
15e30c53	11
61aabc59	12	#include <sys/file.h>
1833b448 KB	13	#include <errno.h>
1833b448 KB	14	#include "extern.h"
15e30c53	15
ba28d9ed EW	16	#define BUFSIZE 4096
ba28d9ed EW	17
15e30c53	18	static char sync_buf[BUFSIZE];
0022de6e	19	static char *sync_bp = sync_buf;
15e30c53 EW	20	static char sync_lock[25];
	21	static char sync_file[25];
	22	static long sync_seek;
	23	static FILE *sync_fp;
	24	#define SF "/tmp/#sailsink.%d"
	25	#define LF "/tmp/#saillock.%d"
	26
	27	/VARARGS3/
	28	makesignal(from, fmt, ship, a, b, c)
ba28d9ed EW	29	struct ship *from;
	30	char *fmt;
	31	register struct ship *ship;
15e30c53 EW	32	{
	33	char message[80];
	34
	35	if (ship == 0)
	36	(void) sprintf(message, fmt, a, b, c);
	37	else
	38	(void) sprintf(message, fmt,
	39	ship->shipname, colours(ship),
	40	sterncolour(ship), a, b, c);
	41	Write(W_SIGNAL, from, 1, (int)message, 0, 0, 0);
	42	}
	43
30d1a80b EW	44	#include <sys/types.h>
30d1a80b EW	45	#include <sys/stat.h>
15e30c53 EW	46	sync_exists(game)
	47	{
	48	char buf[sizeof sync_file];
30d1a80b EW	49	struct stat s;
30d1a80b EW	50	time_t t;
15e30c53 EW	51
15e30c53 EW	52	(void) sprintf(buf, SF, game);
6ca45914	53	(void) time(&t);
30d1a80b EW	54	if (stat(buf, &s) < 0)
	55	return 0;
	56	if (s.st_mtime < t - 60602) { /* 2 hours */
61aabc59 EW	57	(void) unlink(buf);
61aabc59 EW	58	(void) sprintf(buf, LF, game);
6ca45914	59	(void) unlink(buf);
30d1a80b EW	60	return 0;
	61	} else
	62	return 1;
15e30c53 EW	63	}
	64
	65	sync_open()
	66	{
3e8dc8d1 EW	67	if (sync_fp != NULL)
	68	(void) fclose(sync_fp);
	69	(void) sprintf(sync_lock, LF, game);
	70	(void) sprintf(sync_file, SF, game);
	71	if (access(sync_file, 0) < 0) {
	72	int omask = umask(issetuid ? 077 : 011);
	73	sync_fp = fopen(sync_file, "w+");
	74	(void) umask(omask);
	75	} else
	76	sync_fp = fopen(sync_file, "r+");
	77	if (sync_fp == NULL)
	78	return -1;
8607eaac	79	sync_seek = 0;
9224751f	80	return 0;
15e30c53 EW	81	}
	82
	83	sync_close(remove)
ba28d9ed	84	char remove;
15e30c53	85	{
7cd3d9ac EW	86	if (sync_fp != 0)
7cd3d9ac EW	87	(void) fclose(sync_fp);
15e30c53 EW	88	if (remove)
	89	(void) unlink(sync_file);
	90	}
	91
	92	Write(type, ship, isstr, a, b, c, d)
ba28d9ed EW	93	int type;
	94	struct ship *ship;
	95	char isstr;
	96	int a, b, c, d;
15e30c53 EW	97	{
15e30c53 EW	98	if (isstr)
0022de6e	99	(void) sprintf(sync_bp, "%d %d %d %s\n",
6ca45914	100	type, ship->file->index, isstr, a);
15e30c53	101	else
0022de6e	102	(void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
6ca45914	103	type, ship->file->index, isstr, a, b, c, d);
0022de6e	104	while (*sync_bp++)
15e30c53	105	;
0022de6e EW	106	sync_bp--;
0022de6e EW	107	if (sync_bp >= &sync_buf[sizeof sync_buf])
15e30c53	108	abort();
61aabc59	109	(void) sync_update(type, ship, a, b, c, d);
15e30c53 EW	110	}
	111
	112	Sync()
	113	{
6894b138	114	sig_t sighup, sigint;
44c566e8	115	register n;
61aabc59 EW	116	int type, shipnum, isstr, a, b, c, d;
	117	char buf[80];
	118	char erred = 0;
	119	extern errno;
15e30c53	120
8607eaac EW	121	sighup = signal(SIGHUP, SIG_IGN);
8607eaac EW	122	sigint = signal(SIGINT, SIG_IGN);
44c566e8	123	for (n = TIMEOUT; --n >= 0;) {
61aabc59 EW	124	#ifdef LOCK_EX
	125	if (flock(fileno(sync_fp), LOCK_EX\|LOCK_NB) >= 0)
	126	break;
	127	if (errno != EWOULDBLOCK)
	128	return -1;
	129	#else
	130	if (link(sync_file, sync_lock) >= 0)
	131	break;
	132	if (errno != EEXIST)
	133	return -1;
	134	#endif
44c566e8	135	sleep(1);
61aabc59	136	}
44c566e8	137	if (n <= 0)
61aabc59	138	return -1;
15e30c53	139	(void) fseek(sync_fp, sync_seek, 0);
61aabc59 EW	140	for (;;) {
	141	switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
	142	case 3:
	143	break;
	144	case EOF:
	145	goto out;
	146	default:
	147	goto bad;
	148	}
	149	if (shipnum < 0 \|\| shipnum >= cc->vessels)
	150	goto bad;
	151	if (isstr != 0 && isstr != 1)
	152	goto bad;
15e30c53	153	if (isstr) {
61aabc59	154	register char *p;
15e30c53 EW	155	for (p = buf;;) {
	156	switch (*p++ = getc(sync_fp)) {
	157	case '\n':
	158	p--;
	159	case EOF:
	160	break;
	161	default:
61aabc59 EW	162	if (p >= buf + sizeof buf)
61aabc59 EW	163	p--;
15e30c53 EW	164	continue;
	165	}
	166	break;
	167	}
	168	*p = 0;
	169	for (p = buf; *p == ' '; p++)
	170	;
	171	a = (int)p;
	172	b = c = d = 0;
	173	} else
61aabc59 EW	174	if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
	175	goto bad;
	176	if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
	177	goto bad;
15e30c53	178	}
61aabc59 EW	179	bad:
	180	erred++;
	181	out:
	182	if (!erred && sync_bp != sync_buf) {
15e30c53	183	(void) fseek(sync_fp, 0L, 2);
8607eaac EW	184	(void) fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
8607eaac EW	185	sync_fp);
15e30c53	186	(void) fflush(sync_fp);
0022de6e	187	sync_bp = sync_buf;
15e30c53 EW	188	}
15e30c53 EW	189	sync_seek = ftell(sync_fp);
61aabc59 EW	190	#ifdef LOCK_EX
	191	(void) flock(fileno(sync_fp), LOCK_UN);
	192	#else
15e30c53	193	(void) unlink(sync_lock);
61aabc59	194	#endif
8607eaac EW	195	(void) signal(SIGHUP, sighup);
8607eaac EW	196	(void) signal(SIGINT, sigint);
61aabc59	197	return erred ? -1 : 0;
15e30c53 EW	198	}
	199
	200	sync_update(type, ship, a, b, c, d)
ba28d9ed EW	201	int type;
	202	register struct ship *ship;
	203	int a, b, c, d;
15e30c53 EW	204	{
	205	switch (type) {
	206	case W_DBP: {
	207	register struct BP *p = &ship->file->DBP[a];
	208	p->turnsent = b;
	209	p->toship = SHIP(c);
	210	p->mensent = d;
	211	break;
	212	}
	213	case W_OBP: {
	214	register struct BP *p = &ship->file->OBP[a];
	215	p->turnsent = b;
	216	p->toship = SHIP(c);
	217	p->mensent = d;
	218	break;
	219	}
	220	case W_FOUL: {
6ca45914 EW	221	register struct snag *p = &ship->file->foul[a];
	222	if (SHIP(a)->file->dir == 0)
	223	break;
	224	if (p->sn_count++ == 0)
	225	p->sn_turn = turn;
	226	ship->file->nfoul++;
15e30c53 EW	227	break;
	228	}
	229	case W_GRAP: {
6ca45914 EW	230	register struct snag *p = &ship->file->grap[a];
	231	if (SHIP(a)->file->dir == 0)
	232	break;
	233	if (p->sn_count++ == 0)
	234	p->sn_turn = turn;
	235	ship->file->ngrap++;
	236	break;
	237	}
	238	case W_UNFOUL: {
	239	register struct snag *p = &ship->file->foul[a];
	240	if (p->sn_count > 0)
	241	if (b) {
	242	ship->file->nfoul -= p->sn_count;
	243	p->sn_count = 0;
	244	} else {
	245	ship->file->nfoul--;
	246	p->sn_count--;
	247	}
	248	break;
	249	}
	250	case W_UNGRAP: {
	251	register struct snag *p = &ship->file->grap[a];
	252	if (p->sn_count > 0)
	253	if (b) {
	254	ship->file->ngrap -= p->sn_count;
	255	p->sn_count = 0;
	256	} else {
	257	ship->file->ngrap--;
	258	p->sn_count--;
	259	}
15e30c53 EW	260	break;
	261	}
	262	case W_SIGNAL:
ba28d9ed	263	if (mode == MODE_PLAYER)
33873692 EW	264	if (nobells)
	265	Signal("%s (%c%c): %s", ship, a);
	266	else
	267	Signal("\7%s (%c%c): %s", ship, a);
15e30c53 EW	268	break;
	269	case W_CREW: {
	270	register struct shipspecs *s = ship->specs;
	271	s->crew1 = a;
	272	s->crew2 = b;
	273	s->crew3 = c;
	274	break;
	275	}
	276	case W_CAPTAIN:
	277	(void) strncpy(ship->file->captain, (char *)a,
	278	sizeof ship->file->captain - 1);
	279	ship->file->captain[sizeof ship->file->captain - 1] = 0;
	280	break;
	281	case W_CAPTURED:
66e5ed8a EW	282	if (a < 0)
	283	ship->file->captured = 0;
	284	else
	285	ship->file->captured = SHIP(a);
15e30c53 EW	286	break;
	287	case W_CLASS:
	288	ship->specs->class = a;
	289	break;
	290	case W_DRIFT:
	291	ship->file->drift = a;
	292	break;
	293	case W_EXPLODE:
	294	if ((ship->file->explode = a) == 2)
	295	ship->file->dir = 0;
	296	break;
	297	case W_FS:
	298	ship->file->FS = a;
	299	break;
	300	case W_GUNL: {
	301	register struct shipspecs *s = ship->specs;
	302	s->gunL = a;
	303	s->carL = b;
	304	break;
	305	}
	306	case W_GUNR: {
	307	register struct shipspecs *s = ship->specs;
	308	s->gunR = a;
	309	s->carR = b;
	310	break;
	311	}
	312	case W_HULL:
	313	ship->specs->hull = a;
	314	break;
6ca45914 EW	315	case W_MOVE:
	316	(void) strncpy(ship->file->movebuf, (char *)a,
	317	sizeof ship->file->movebuf - 1);
	318	ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
15e30c53 EW	319	break;
	320	case W_PCREW:
	321	ship->file->pcrew = a;
	322	break;
	323	case W_POINTS:
	324	ship->file->points = a;
	325	break;
	326	case W_QUAL:
	327	ship->specs->qual = a;
	328	break;
	329	case W_RIGG: {
	330	register struct shipspecs *s = ship->specs;
	331	s->rig1 = a;
	332	s->rig2 = b;
	333	s->rig3 = c;
	334	s->rig4 = d;
	335	break;
	336	}
	337	case W_RIG1:
	338	ship->specs->rig1 = a;
	339	break;
	340	case W_RIG2:
	341	ship->specs->rig2 = a;
	342	break;
	343	case W_RIG3:
	344	ship->specs->rig3 = a;
	345	break;
	346	case W_RIG4:
	347	ship->specs->rig4 = a;
	348	break;
6ca45914	349	case W_COL:
15e30c53 EW	350	ship->file->col = a;
15e30c53 EW	351	break;
6ca45914	352	case W_DIR:
15e30c53 EW	353	ship->file->dir = a;
15e30c53 EW	354	break;
6ca45914	355	case W_ROW:
15e30c53 EW	356	ship->file->row = a;
	357	break;
	358	case W_SINK:
	359	if ((ship->file->sink = a) == 2)
	360	ship->file->dir = 0;
	361	break;
	362	case W_STRUCK:
	363	ship->file->struck = a;
	364	break;
	365	case W_TA:
	366	ship->specs->ta = a;
	367	break;
	368	case W_ALIVE:
	369	alive = 1;
	370	break;
	371	case W_TURN:
	372	turn = a;
	373	break;
	374	case W_WIND:
	375	winddir = a;
	376	windspeed = b;
	377	break;
	378	case W_BEGIN:
	379	(void) strcpy(ship->file->captain, "begin");
	380	people++;
	381	break;
	382	case W_END:
61aabc59 EW	383	*ship->file->captain = 0;
61aabc59 EW	384	ship->file->points = 0;
15e30c53 EW	385	people--;
15e30c53 EW	386	break;
61aabc59 EW	387	case W_DDEAD:
61aabc59 EW	388	hasdriver = 0;
15e30c53	389	break;
61aabc59 EW	390	default:
	391	fprintf(stderr, "sync_update: unknown type %d\r\n", type);
	392	return -1;
15e30c53	393	}
61aabc59	394	return 0;
15e30c53	395	}