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

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)sync.c	5.1 (Berkeley) %G%";
#endif not lint

#include "externs.h"
#include <sys/file.h>
#include <sys/errno.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()
{
	int (*sig1)(), (*sig2)();
	register n;
	int type, shipnum, isstr, a, b, c, d;
	char buf[80];
	char erred = 0;
	extern errno;

	sig1 = signal(SIGHUP, SIG_IGN);
	sig2 = 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) fputs(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, sig1);
	(void) signal(SIGINT, sig2);
	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	/*
1e008c14 DF	2	* Copyright (c) 1983 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
b5f0675e EW	5	*/
b5f0675e EW	6
15e30c53	7	#ifndef lint
1e008c14 DF	8	static char sccsid[] = "@(#)sync.c 5.1 (Berkeley) %G%";
1e008c14 DF	9	#endif not lint
15e30c53 EW	10
15e30c53 EW	11	#include "externs.h"
61aabc59 EW	12	#include <sys/file.h>
61aabc59 EW	13	#include <sys/errno.h>
15e30c53	14
ba28d9ed EW	15	#define BUFSIZE 4096
ba28d9ed EW	16
15e30c53	17	static char sync_buf[BUFSIZE];
0022de6e	18	static char *sync_bp = sync_buf;
15e30c53 EW	19	static char sync_lock[25];
	20	static char sync_file[25];
	21	static long sync_seek;
	22	static FILE *sync_fp;
	23	#define SF "/tmp/#sailsink.%d"
	24	#define LF "/tmp/#saillock.%d"
	25
	26	/VARARGS3/
	27	makesignal(from, fmt, ship, a, b, c)
ba28d9ed EW	28	struct ship *from;
	29	char *fmt;
	30	register struct ship *ship;
15e30c53 EW	31	{
	32	char message[80];
	33
	34	if (ship == 0)
	35	(void) sprintf(message, fmt, a, b, c);
	36	else
	37	(void) sprintf(message, fmt,
	38	ship->shipname, colours(ship),
	39	sterncolour(ship), a, b, c);
	40	Write(W_SIGNAL, from, 1, (int)message, 0, 0, 0);
	41	}
	42
30d1a80b EW	43	#include <sys/types.h>
30d1a80b EW	44	#include <sys/stat.h>
15e30c53 EW	45	sync_exists(game)
	46	{
	47	char buf[sizeof sync_file];
30d1a80b EW	48	struct stat s;
30d1a80b EW	49	time_t t;
15e30c53 EW	50
15e30c53 EW	51	(void) sprintf(buf, SF, game);
6ca45914	52	(void) time(&t);
30d1a80b EW	53	if (stat(buf, &s) < 0)
	54	return 0;
	55	if (s.st_mtime < t - 60602) { /* 2 hours */
61aabc59 EW	56	(void) unlink(buf);
61aabc59 EW	57	(void) sprintf(buf, LF, game);
6ca45914	58	(void) unlink(buf);
30d1a80b EW	59	return 0;
	60	} else
	61	return 1;
15e30c53 EW	62	}
	63
	64	sync_open()
	65	{
3e8dc8d1 EW	66	if (sync_fp != NULL)
	67	(void) fclose(sync_fp);
	68	(void) sprintf(sync_lock, LF, game);
	69	(void) sprintf(sync_file, SF, game);
	70	if (access(sync_file, 0) < 0) {
	71	int omask = umask(issetuid ? 077 : 011);
	72	sync_fp = fopen(sync_file, "w+");
	73	(void) umask(omask);
	74	} else
	75	sync_fp = fopen(sync_file, "r+");
	76	if (sync_fp == NULL)
	77	return -1;
15e30c53	78	sync_seek == 0;
9224751f	79	return 0;
15e30c53 EW	80	}
	81
	82	sync_close(remove)
ba28d9ed	83	char remove;
15e30c53	84	{
7cd3d9ac EW	85	if (sync_fp != 0)
7cd3d9ac EW	86	(void) fclose(sync_fp);
15e30c53 EW	87	if (remove)
	88	(void) unlink(sync_file);
	89	}
	90
	91	Write(type, ship, isstr, a, b, c, d)
ba28d9ed EW	92	int type;
	93	struct ship *ship;
	94	char isstr;
	95	int a, b, c, d;
15e30c53 EW	96	{
15e30c53 EW	97	if (isstr)
0022de6e	98	(void) sprintf(sync_bp, "%d %d %d %s\n",
6ca45914	99	type, ship->file->index, isstr, a);
15e30c53	100	else
0022de6e	101	(void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
6ca45914	102	type, ship->file->index, isstr, a, b, c, d);
0022de6e	103	while (*sync_bp++)
15e30c53	104	;
0022de6e EW	105	sync_bp--;
0022de6e EW	106	if (sync_bp >= &sync_buf[sizeof sync_buf])
15e30c53	107	abort();
61aabc59	108	(void) sync_update(type, ship, a, b, c, d);
15e30c53 EW	109	}
	110
	111	Sync()
	112	{
	113	int (sig1)(), (sig2)();
44c566e8	114	register n;
61aabc59 EW	115	int type, shipnum, isstr, a, b, c, d;
	116	char buf[80];
	117	char erred = 0;
	118	extern errno;
15e30c53 EW	119
	120	sig1 = signal(SIGHUP, SIG_IGN);
	121	sig2 = signal(SIGINT, SIG_IGN);
44c566e8	122	for (n = TIMEOUT; --n >= 0;) {
61aabc59 EW	123	#ifdef LOCK_EX
	124	if (flock(fileno(sync_fp), LOCK_EX\|LOCK_NB) >= 0)
	125	break;
	126	if (errno != EWOULDBLOCK)
	127	return -1;
	128	#else
	129	if (link(sync_file, sync_lock) >= 0)
	130	break;
	131	if (errno != EEXIST)
	132	return -1;
	133	#endif
44c566e8	134	sleep(1);
61aabc59	135	}
44c566e8	136	if (n <= 0)
61aabc59	137	return -1;
15e30c53	138	(void) fseek(sync_fp, sync_seek, 0);
61aabc59 EW	139	for (;;) {
	140	switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
	141	case 3:
	142	break;
	143	case EOF:
	144	goto out;
	145	default:
	146	goto bad;
	147	}
	148	if (shipnum < 0 \|\| shipnum >= cc->vessels)
	149	goto bad;
	150	if (isstr != 0 && isstr != 1)
	151	goto bad;
15e30c53	152	if (isstr) {
61aabc59	153	register char *p;
15e30c53 EW	154	for (p = buf;;) {
	155	switch (*p++ = getc(sync_fp)) {
	156	case '\n':
	157	p--;
	158	case EOF:
	159	break;
	160	default:
61aabc59 EW	161	if (p >= buf + sizeof buf)
61aabc59 EW	162	p--;
15e30c53 EW	163	continue;
	164	}
	165	break;
	166	}
	167	*p = 0;
	168	for (p = buf; *p == ' '; p++)
	169	;
	170	a = (int)p;
	171	b = c = d = 0;
	172	} else
61aabc59 EW	173	if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
	174	goto bad;
	175	if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
	176	goto bad;
15e30c53	177	}
61aabc59 EW	178	bad:
	179	erred++;
	180	out:
	181	if (!erred && sync_bp != sync_buf) {
15e30c53 EW	182	(void) fseek(sync_fp, 0L, 2);
	183	(void) fputs(sync_buf, sync_fp);
	184	(void) fflush(sync_fp);
0022de6e	185	sync_bp = sync_buf;
15e30c53 EW	186	}
15e30c53 EW	187	sync_seek = ftell(sync_fp);
61aabc59 EW	188	#ifdef LOCK_EX
	189	(void) flock(fileno(sync_fp), LOCK_UN);
	190	#else
15e30c53	191	(void) unlink(sync_lock);
61aabc59	192	#endif
15e30c53 EW	193	(void) signal(SIGHUP, sig1);
15e30c53 EW	194	(void) signal(SIGINT, sig2);
61aabc59	195	return erred ? -1 : 0;
15e30c53 EW	196	}
	197
	198	sync_update(type, ship, a, b, c, d)
ba28d9ed EW	199	int type;
	200	register struct ship *ship;
	201	int a, b, c, d;
15e30c53 EW	202	{
	203	switch (type) {
	204	case W_DBP: {
	205	register struct BP *p = &ship->file->DBP[a];
	206	p->turnsent = b;
	207	p->toship = SHIP(c);
	208	p->mensent = d;
	209	break;
	210	}
	211	case W_OBP: {
	212	register struct BP *p = &ship->file->OBP[a];
	213	p->turnsent = b;
	214	p->toship = SHIP(c);
	215	p->mensent = d;
	216	break;
	217	}
	218	case W_FOUL: {
6ca45914 EW	219	register struct snag *p = &ship->file->foul[a];
	220	if (SHIP(a)->file->dir == 0)
	221	break;
	222	if (p->sn_count++ == 0)
	223	p->sn_turn = turn;
	224	ship->file->nfoul++;
15e30c53 EW	225	break;
	226	}
	227	case W_GRAP: {
6ca45914 EW	228	register struct snag *p = &ship->file->grap[a];
	229	if (SHIP(a)->file->dir == 0)
	230	break;
	231	if (p->sn_count++ == 0)
	232	p->sn_turn = turn;
	233	ship->file->ngrap++;
	234	break;
	235	}
	236	case W_UNFOUL: {
	237	register struct snag *p = &ship->file->foul[a];
	238	if (p->sn_count > 0)
	239	if (b) {
	240	ship->file->nfoul -= p->sn_count;
	241	p->sn_count = 0;
	242	} else {
	243	ship->file->nfoul--;
	244	p->sn_count--;
	245	}
	246	break;
	247	}
	248	case W_UNGRAP: {
	249	register struct snag *p = &ship->file->grap[a];
	250	if (p->sn_count > 0)
	251	if (b) {
	252	ship->file->ngrap -= p->sn_count;
	253	p->sn_count = 0;
	254	} else {
	255	ship->file->ngrap--;
	256	p->sn_count--;
	257	}
15e30c53 EW	258	break;
	259	}
	260	case W_SIGNAL:
ba28d9ed	261	if (mode == MODE_PLAYER)
33873692 EW	262	if (nobells)
	263	Signal("%s (%c%c): %s", ship, a);
	264	else
	265	Signal("\7%s (%c%c): %s", ship, a);
15e30c53 EW	266	break;
	267	case W_CREW: {
	268	register struct shipspecs *s = ship->specs;
	269	s->crew1 = a;
	270	s->crew2 = b;
	271	s->crew3 = c;
	272	break;
	273	}
	274	case W_CAPTAIN:
	275	(void) strncpy(ship->file->captain, (char *)a,
	276	sizeof ship->file->captain - 1);
	277	ship->file->captain[sizeof ship->file->captain - 1] = 0;
	278	break;
	279	case W_CAPTURED:
66e5ed8a EW	280	if (a < 0)
	281	ship->file->captured = 0;
	282	else
	283	ship->file->captured = SHIP(a);
15e30c53 EW	284	break;
	285	case W_CLASS:
	286	ship->specs->class = a;
	287	break;
	288	case W_DRIFT:
	289	ship->file->drift = a;
	290	break;
	291	case W_EXPLODE:
	292	if ((ship->file->explode = a) == 2)
	293	ship->file->dir = 0;
	294	break;
	295	case W_FS:
	296	ship->file->FS = a;
	297	break;
	298	case W_GUNL: {
	299	register struct shipspecs *s = ship->specs;
	300	s->gunL = a;
	301	s->carL = b;
	302	break;
	303	}
	304	case W_GUNR: {
	305	register struct shipspecs *s = ship->specs;
	306	s->gunR = a;
	307	s->carR = b;
	308	break;
	309	}
	310	case W_HULL:
	311	ship->specs->hull = a;
	312	break;
6ca45914 EW	313	case W_MOVE:
	314	(void) strncpy(ship->file->movebuf, (char *)a,
	315	sizeof ship->file->movebuf - 1);
	316	ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
15e30c53 EW	317	break;
	318	case W_PCREW:
	319	ship->file->pcrew = a;
	320	break;
	321	case W_POINTS:
	322	ship->file->points = a;
	323	break;
	324	case W_QUAL:
	325	ship->specs->qual = a;
	326	break;
	327	case W_RIGG: {
	328	register struct shipspecs *s = ship->specs;
	329	s->rig1 = a;
	330	s->rig2 = b;
	331	s->rig3 = c;
	332	s->rig4 = d;
	333	break;
	334	}
	335	case W_RIG1:
	336	ship->specs->rig1 = a;
	337	break;
	338	case W_RIG2:
	339	ship->specs->rig2 = a;
	340	break;
	341	case W_RIG3:
	342	ship->specs->rig3 = a;
	343	break;
	344	case W_RIG4:
	345	ship->specs->rig4 = a;
	346	break;
6ca45914	347	case W_COL:
15e30c53 EW	348	ship->file->col = a;
15e30c53 EW	349	break;
6ca45914	350	case W_DIR:
15e30c53 EW	351	ship->file->dir = a;
15e30c53 EW	352	break;
6ca45914	353	case W_ROW:
15e30c53 EW	354	ship->file->row = a;
	355	break;
	356	case W_SINK:
	357	if ((ship->file->sink = a) == 2)
	358	ship->file->dir = 0;
	359	break;
	360	case W_STRUCK:
	361	ship->file->struck = a;
	362	break;
	363	case W_TA:
	364	ship->specs->ta = a;
	365	break;
	366	case W_ALIVE:
	367	alive = 1;
	368	break;
	369	case W_TURN:
	370	turn = a;
	371	break;
	372	case W_WIND:
	373	winddir = a;
	374	windspeed = b;
	375	break;
	376	case W_BEGIN:
	377	(void) strcpy(ship->file->captain, "begin");
	378	people++;
	379	break;
	380	case W_END:
61aabc59 EW	381	*ship->file->captain = 0;
61aabc59 EW	382	ship->file->points = 0;
15e30c53 EW	383	people--;
15e30c53 EW	384	break;
61aabc59 EW	385	case W_DDEAD:
61aabc59 EW	386	hasdriver = 0;
15e30c53	387	break;
61aabc59 EW	388	default:
	389	fprintf(stderr, "sync_update: unknown type %d\r\n", type);
	390	return -1;
15e30c53	391	}
61aabc59	392	return 0;
15e30c53	393	}