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

#ifndef lint
static	char *sccsid = "@(#)sync.c	2.9 85/04/22";
#endif

#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
15e30c53	1	#ifndef lint
33873692	2	static char *sccsid = "@(#)sync.c 2.9 85/04/22";
15e30c53 EW	3	#endif
	4
	5	#include "externs.h"
61aabc59 EW	6	#include <sys/file.h>
61aabc59 EW	7	#include <sys/errno.h>
15e30c53	8
ba28d9ed EW	9	#define BUFSIZE 4096
ba28d9ed EW	10
15e30c53	11	static char sync_buf[BUFSIZE];
0022de6e	12	static char *sync_bp = sync_buf;
15e30c53 EW	13	static char sync_lock[25];
	14	static char sync_file[25];
	15	static long sync_seek;
	16	static FILE *sync_fp;
	17	#define SF "/tmp/#sailsink.%d"
	18	#define LF "/tmp/#saillock.%d"
	19
	20	/VARARGS3/
	21	makesignal(from, fmt, ship, a, b, c)
ba28d9ed EW	22	struct ship *from;
	23	char *fmt;
	24	register struct ship *ship;
15e30c53 EW	25	{
	26	char message[80];
	27
	28	if (ship == 0)
	29	(void) sprintf(message, fmt, a, b, c);
	30	else
	31	(void) sprintf(message, fmt,
	32	ship->shipname, colours(ship),
	33	sterncolour(ship), a, b, c);
	34	Write(W_SIGNAL, from, 1, (int)message, 0, 0, 0);
	35	}
	36
30d1a80b EW	37	#include <sys/types.h>
30d1a80b EW	38	#include <sys/stat.h>
15e30c53 EW	39	sync_exists(game)
	40	{
	41	char buf[sizeof sync_file];
30d1a80b EW	42	struct stat s;
30d1a80b EW	43	time_t t;
15e30c53 EW	44
15e30c53 EW	45	(void) sprintf(buf, SF, game);
6ca45914	46	(void) time(&t);
30d1a80b EW	47	if (stat(buf, &s) < 0)
	48	return 0;
	49	if (s.st_mtime < t - 60602) { /* 2 hours */
61aabc59 EW	50	(void) unlink(buf);
61aabc59 EW	51	(void) sprintf(buf, LF, game);
6ca45914	52	(void) unlink(buf);
30d1a80b EW	53	return 0;
	54	} else
	55	return 1;
15e30c53 EW	56	}
	57
	58	sync_open()
	59	{
3e8dc8d1 EW	60	if (sync_fp != NULL)
	61	(void) fclose(sync_fp);
	62	(void) sprintf(sync_lock, LF, game);
	63	(void) sprintf(sync_file, SF, game);
	64	if (access(sync_file, 0) < 0) {
	65	int omask = umask(issetuid ? 077 : 011);
	66	sync_fp = fopen(sync_file, "w+");
	67	(void) umask(omask);
	68	} else
	69	sync_fp = fopen(sync_file, "r+");
	70	if (sync_fp == NULL)
	71	return -1;
15e30c53	72	sync_seek == 0;
9224751f	73	return 0;
15e30c53 EW	74	}
	75
	76	sync_close(remove)
ba28d9ed	77	char remove;
15e30c53	78	{
7cd3d9ac EW	79	if (sync_fp != 0)
7cd3d9ac EW	80	(void) fclose(sync_fp);
15e30c53 EW	81	if (remove)
	82	(void) unlink(sync_file);
	83	}
	84
	85	Write(type, ship, isstr, a, b, c, d)
ba28d9ed EW	86	int type;
	87	struct ship *ship;
	88	char isstr;
	89	int a, b, c, d;
15e30c53 EW	90	{
15e30c53 EW	91	if (isstr)
0022de6e	92	(void) sprintf(sync_bp, "%d %d %d %s\n",
6ca45914	93	type, ship->file->index, isstr, a);
15e30c53	94	else
0022de6e	95	(void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
6ca45914	96	type, ship->file->index, isstr, a, b, c, d);
0022de6e	97	while (*sync_bp++)
15e30c53	98	;
0022de6e EW	99	sync_bp--;
0022de6e EW	100	if (sync_bp >= &sync_buf[sizeof sync_buf])
15e30c53	101	abort();
61aabc59	102	(void) sync_update(type, ship, a, b, c, d);
15e30c53 EW	103	}
	104
	105	Sync()
	106	{
	107	int (sig1)(), (sig2)();
44c566e8	108	register n;
61aabc59 EW	109	int type, shipnum, isstr, a, b, c, d;
	110	char buf[80];
	111	char erred = 0;
	112	extern errno;
15e30c53 EW	113
	114	sig1 = signal(SIGHUP, SIG_IGN);
	115	sig2 = signal(SIGINT, SIG_IGN);
44c566e8	116	for (n = TIMEOUT; --n >= 0;) {
61aabc59 EW	117	#ifdef LOCK_EX
	118	if (flock(fileno(sync_fp), LOCK_EX\|LOCK_NB) >= 0)
	119	break;
	120	if (errno != EWOULDBLOCK)
	121	return -1;
	122	#else
	123	if (link(sync_file, sync_lock) >= 0)
	124	break;
	125	if (errno != EEXIST)
	126	return -1;
	127	#endif
44c566e8	128	sleep(1);
61aabc59	129	}
44c566e8	130	if (n <= 0)
61aabc59	131	return -1;
15e30c53	132	(void) fseek(sync_fp, sync_seek, 0);
61aabc59 EW	133	for (;;) {
	134	switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
	135	case 3:
	136	break;
	137	case EOF:
	138	goto out;
	139	default:
	140	goto bad;
	141	}
	142	if (shipnum < 0 \|\| shipnum >= cc->vessels)
	143	goto bad;
	144	if (isstr != 0 && isstr != 1)
	145	goto bad;
15e30c53	146	if (isstr) {
61aabc59	147	register char *p;
15e30c53 EW	148	for (p = buf;;) {
	149	switch (*p++ = getc(sync_fp)) {
	150	case '\n':
	151	p--;
	152	case EOF:
	153	break;
	154	default:
61aabc59 EW	155	if (p >= buf + sizeof buf)
61aabc59 EW	156	p--;
15e30c53 EW	157	continue;
	158	}
	159	break;
	160	}
	161	*p = 0;
	162	for (p = buf; *p == ' '; p++)
	163	;
	164	a = (int)p;
	165	b = c = d = 0;
	166	} else
61aabc59 EW	167	if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
	168	goto bad;
	169	if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
	170	goto bad;
15e30c53	171	}
61aabc59 EW	172	bad:
	173	erred++;
	174	out:
	175	if (!erred && sync_bp != sync_buf) {
15e30c53 EW	176	(void) fseek(sync_fp, 0L, 2);
	177	(void) fputs(sync_buf, sync_fp);
	178	(void) fflush(sync_fp);
0022de6e	179	sync_bp = sync_buf;
15e30c53 EW	180	}
15e30c53 EW	181	sync_seek = ftell(sync_fp);
61aabc59 EW	182	#ifdef LOCK_EX
	183	(void) flock(fileno(sync_fp), LOCK_UN);
	184	#else
15e30c53	185	(void) unlink(sync_lock);
61aabc59	186	#endif
15e30c53 EW	187	(void) signal(SIGHUP, sig1);
15e30c53 EW	188	(void) signal(SIGINT, sig2);
61aabc59	189	return erred ? -1 : 0;
15e30c53 EW	190	}
	191
	192	sync_update(type, ship, a, b, c, d)
ba28d9ed EW	193	int type;
	194	register struct ship *ship;
	195	int a, b, c, d;
15e30c53 EW	196	{
	197	switch (type) {
	198	case W_DBP: {
	199	register struct BP *p = &ship->file->DBP[a];
	200	p->turnsent = b;
	201	p->toship = SHIP(c);
	202	p->mensent = d;
	203	break;
	204	}
	205	case W_OBP: {
	206	register struct BP *p = &ship->file->OBP[a];
	207	p->turnsent = b;
	208	p->toship = SHIP(c);
	209	p->mensent = d;
	210	break;
	211	}
	212	case W_FOUL: {
6ca45914 EW	213	register struct snag *p = &ship->file->foul[a];
	214	if (SHIP(a)->file->dir == 0)
	215	break;
	216	if (p->sn_count++ == 0)
	217	p->sn_turn = turn;
	218	ship->file->nfoul++;
15e30c53 EW	219	break;
	220	}
	221	case W_GRAP: {
6ca45914 EW	222	register struct snag *p = &ship->file->grap[a];
	223	if (SHIP(a)->file->dir == 0)
	224	break;
	225	if (p->sn_count++ == 0)
	226	p->sn_turn = turn;
	227	ship->file->ngrap++;
	228	break;
	229	}
	230	case W_UNFOUL: {
	231	register struct snag *p = &ship->file->foul[a];
	232	if (p->sn_count > 0)
	233	if (b) {
	234	ship->file->nfoul -= p->sn_count;
	235	p->sn_count = 0;
	236	} else {
	237	ship->file->nfoul--;
	238	p->sn_count--;
	239	}
	240	break;
	241	}
	242	case W_UNGRAP: {
	243	register struct snag *p = &ship->file->grap[a];
	244	if (p->sn_count > 0)
	245	if (b) {
	246	ship->file->ngrap -= p->sn_count;
	247	p->sn_count = 0;
	248	} else {
	249	ship->file->ngrap--;
	250	p->sn_count--;
	251	}
15e30c53 EW	252	break;
	253	}
	254	case W_SIGNAL:
ba28d9ed	255	if (mode == MODE_PLAYER)
33873692 EW	256	if (nobells)
	257	Signal("%s (%c%c): %s", ship, a);
	258	else
	259	Signal("\7%s (%c%c): %s", ship, a);
15e30c53 EW	260	break;
	261	case W_CREW: {
	262	register struct shipspecs *s = ship->specs;
	263	s->crew1 = a;
	264	s->crew2 = b;
	265	s->crew3 = c;
	266	break;
	267	}
	268	case W_CAPTAIN:
	269	(void) strncpy(ship->file->captain, (char *)a,
	270	sizeof ship->file->captain - 1);
	271	ship->file->captain[sizeof ship->file->captain - 1] = 0;
	272	break;
	273	case W_CAPTURED:
66e5ed8a EW	274	if (a < 0)
	275	ship->file->captured = 0;
	276	else
	277	ship->file->captured = SHIP(a);
15e30c53 EW	278	break;
	279	case W_CLASS:
	280	ship->specs->class = a;
	281	break;
	282	case W_DRIFT:
	283	ship->file->drift = a;
	284	break;
	285	case W_EXPLODE:
	286	if ((ship->file->explode = a) == 2)
	287	ship->file->dir = 0;
	288	break;
	289	case W_FS:
	290	ship->file->FS = a;
	291	break;
	292	case W_GUNL: {
	293	register struct shipspecs *s = ship->specs;
	294	s->gunL = a;
	295	s->carL = b;
	296	break;
	297	}
	298	case W_GUNR: {
	299	register struct shipspecs *s = ship->specs;
	300	s->gunR = a;
	301	s->carR = b;
	302	break;
	303	}
	304	case W_HULL:
	305	ship->specs->hull = a;
	306	break;
6ca45914 EW	307	case W_MOVE:
	308	(void) strncpy(ship->file->movebuf, (char *)a,
	309	sizeof ship->file->movebuf - 1);
	310	ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
15e30c53 EW	311	break;
	312	case W_PCREW:
	313	ship->file->pcrew = a;
	314	break;
	315	case W_POINTS:
	316	ship->file->points = a;
	317	break;
	318	case W_QUAL:
	319	ship->specs->qual = a;
	320	break;
	321	case W_RIGG: {
	322	register struct shipspecs *s = ship->specs;
	323	s->rig1 = a;
	324	s->rig2 = b;
	325	s->rig3 = c;
	326	s->rig4 = d;
	327	break;
	328	}
	329	case W_RIG1:
	330	ship->specs->rig1 = a;
	331	break;
	332	case W_RIG2:
	333	ship->specs->rig2 = a;
	334	break;
	335	case W_RIG3:
	336	ship->specs->rig3 = a;
	337	break;
	338	case W_RIG4:
	339	ship->specs->rig4 = a;
	340	break;
6ca45914	341	case W_COL:
15e30c53 EW	342	ship->file->col = a;
15e30c53 EW	343	break;
6ca45914	344	case W_DIR:
15e30c53 EW	345	ship->file->dir = a;
15e30c53 EW	346	break;
6ca45914	347	case W_ROW:
15e30c53 EW	348	ship->file->row = a;
	349	break;
	350	case W_SINK:
	351	if ((ship->file->sink = a) == 2)
	352	ship->file->dir = 0;
	353	break;
	354	case W_STRUCK:
	355	ship->file->struck = a;
	356	break;
	357	case W_TA:
	358	ship->specs->ta = a;
	359	break;
	360	case W_ALIVE:
	361	alive = 1;
	362	break;
	363	case W_TURN:
	364	turn = a;
	365	break;
	366	case W_WIND:
	367	winddir = a;
	368	windspeed = b;
	369	break;
	370	case W_BEGIN:
	371	(void) strcpy(ship->file->captain, "begin");
	372	people++;
	373	break;
	374	case W_END:
61aabc59 EW	375	*ship->file->captain = 0;
61aabc59 EW	376	ship->file->points = 0;
15e30c53 EW	377	people--;
15e30c53 EW	378	break;
61aabc59 EW	379	case W_DDEAD:
61aabc59 EW	380	hasdriver = 0;
15e30c53	381	break;
61aabc59 EW	382	default:
	383	fprintf(stderr, "sync_update: unknown type %d\r\n", type);
	384	return -1;
15e30c53	385	}
61aabc59	386	return 0;
15e30c53	387	}