[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	5.2 (Berkeley) 1/21/86";
#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 (*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	/*
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
95f51977	8	static char sccsid[] = "@(#)sync.c 5.2 (Berkeley) 1/21/86";
1e008c14	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;
8607eaac	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	{
8607eaac	113	int (sighup)(), (sigint)();
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	119
8607eaac EW	120	sighup = signal(SIGHUP, SIG_IGN);
8607eaac EW	121	sigint = 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	182	(void) fseek(sync_fp, 0L, 2);
8607eaac EW	183	(void) fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
8607eaac EW	184	sync_fp);
15e30c53	185	(void) fflush(sync_fp);
0022de6e	186	sync_bp = sync_buf;
15e30c53 EW	187	}
15e30c53 EW	188	sync_seek = ftell(sync_fp);
61aabc59 EW	189	#ifdef LOCK_EX
	190	(void) flock(fileno(sync_fp), LOCK_UN);
	191	#else
15e30c53	192	(void) unlink(sync_lock);
61aabc59	193	#endif
8607eaac EW	194	(void) signal(SIGHUP, sighup);
8607eaac EW	195	(void) signal(SIGINT, sigint);
61aabc59	196	return erred ? -1 : 0;
15e30c53 EW	197	}
	198
	199	sync_update(type, ship, a, b, c, d)
ba28d9ed EW	200	int type;
	201	register struct ship *ship;
	202	int a, b, c, d;
15e30c53 EW	203	{
	204	switch (type) {
	205	case W_DBP: {
	206	register struct BP *p = &ship->file->DBP[a];
	207	p->turnsent = b;
	208	p->toship = SHIP(c);
	209	p->mensent = d;
	210	break;
	211	}
	212	case W_OBP: {
	213	register struct BP *p = &ship->file->OBP[a];
	214	p->turnsent = b;
	215	p->toship = SHIP(c);
	216	p->mensent = d;
	217	break;
	218	}
	219	case W_FOUL: {
6ca45914 EW	220	register struct snag *p = &ship->file->foul[a];
	221	if (SHIP(a)->file->dir == 0)
	222	break;
	223	if (p->sn_count++ == 0)
	224	p->sn_turn = turn;
	225	ship->file->nfoul++;
15e30c53 EW	226	break;
	227	}
	228	case W_GRAP: {
6ca45914 EW	229	register struct snag *p = &ship->file->grap[a];
	230	if (SHIP(a)->file->dir == 0)
	231	break;
	232	if (p->sn_count++ == 0)
	233	p->sn_turn = turn;
	234	ship->file->ngrap++;
	235	break;
	236	}
	237	case W_UNFOUL: {
	238	register struct snag *p = &ship->file->foul[a];
	239	if (p->sn_count > 0)
	240	if (b) {
	241	ship->file->nfoul -= p->sn_count;
	242	p->sn_count = 0;
	243	} else {
	244	ship->file->nfoul--;
	245	p->sn_count--;
	246	}
	247	break;
	248	}
	249	case W_UNGRAP: {
	250	register struct snag *p = &ship->file->grap[a];
	251	if (p->sn_count > 0)
	252	if (b) {
	253	ship->file->ngrap -= p->sn_count;
	254	p->sn_count = 0;
	255	} else {
	256	ship->file->ngrap--;
	257	p->sn_count--;
	258	}
15e30c53 EW	259	break;
	260	}
	261	case W_SIGNAL:
ba28d9ed	262	if (mode == MODE_PLAYER)
33873692 EW	263	if (nobells)
	264	Signal("%s (%c%c): %s", ship, a);
	265	else
	266	Signal("\7%s (%c%c): %s", ship, a);
15e30c53 EW	267	break;
	268	case W_CREW: {
	269	register struct shipspecs *s = ship->specs;
	270	s->crew1 = a;
	271	s->crew2 = b;
	272	s->crew3 = c;
	273	break;
	274	}
	275	case W_CAPTAIN:
	276	(void) strncpy(ship->file->captain, (char *)a,
	277	sizeof ship->file->captain - 1);
	278	ship->file->captain[sizeof ship->file->captain - 1] = 0;
	279	break;
	280	case W_CAPTURED:
66e5ed8a EW	281	if (a < 0)
	282	ship->file->captured = 0;
	283	else
	284	ship->file->captured = SHIP(a);
15e30c53 EW	285	break;
	286	case W_CLASS:
	287	ship->specs->class = a;
	288	break;
	289	case W_DRIFT:
	290	ship->file->drift = a;
	291	break;
	292	case W_EXPLODE:
	293	if ((ship->file->explode = a) == 2)
	294	ship->file->dir = 0;
	295	break;
	296	case W_FS:
	297	ship->file->FS = a;
	298	break;
	299	case W_GUNL: {
	300	register struct shipspecs *s = ship->specs;
	301	s->gunL = a;
	302	s->carL = b;
	303	break;
	304	}
	305	case W_GUNR: {
	306	register struct shipspecs *s = ship->specs;
	307	s->gunR = a;
	308	s->carR = b;
	309	break;
	310	}
	311	case W_HULL:
	312	ship->specs->hull = a;
	313	break;
6ca45914 EW	314	case W_MOVE:
	315	(void) strncpy(ship->file->movebuf, (char *)a,
	316	sizeof ship->file->movebuf - 1);
	317	ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
15e30c53 EW	318	break;
	319	case W_PCREW:
	320	ship->file->pcrew = a;
	321	break;
	322	case W_POINTS:
	323	ship->file->points = a;
	324	break;
	325	case W_QUAL:
	326	ship->specs->qual = a;
	327	break;
	328	case W_RIGG: {
	329	register struct shipspecs *s = ship->specs;
	330	s->rig1 = a;
	331	s->rig2 = b;
	332	s->rig3 = c;
	333	s->rig4 = d;
	334	break;
	335	}
	336	case W_RIG1:
	337	ship->specs->rig1 = a;
	338	break;
	339	case W_RIG2:
	340	ship->specs->rig2 = a;
	341	break;
	342	case W_RIG3:
	343	ship->specs->rig3 = a;
	344	break;
	345	case W_RIG4:
	346	ship->specs->rig4 = a;
	347	break;
6ca45914	348	case W_COL:
15e30c53 EW	349	ship->file->col = a;
15e30c53 EW	350	break;
6ca45914	351	case W_DIR:
15e30c53 EW	352	ship->file->dir = a;
15e30c53 EW	353	break;
6ca45914	354	case W_ROW:
15e30c53 EW	355	ship->file->row = a;
	356	break;
	357	case W_SINK:
	358	if ((ship->file->sink = a) == 2)
	359	ship->file->dir = 0;
	360	break;
	361	case W_STRUCK:
	362	ship->file->struck = a;
	363	break;
	364	case W_TA:
	365	ship->specs->ta = a;
	366	break;
	367	case W_ALIVE:
	368	alive = 1;
	369	break;
	370	case W_TURN:
	371	turn = a;
	372	break;
	373	case W_WIND:
	374	winddir = a;
	375	windspeed = b;
	376	break;
	377	case W_BEGIN:
	378	(void) strcpy(ship->file->captain, "begin");
	379	people++;
	380	break;
	381	case W_END:
61aabc59 EW	382	*ship->file->captain = 0;
61aabc59 EW	383	ship->file->points = 0;
15e30c53 EW	384	people--;
15e30c53 EW	385	break;
61aabc59 EW	386	case W_DDEAD:
61aabc59 EW	387	hasdriver = 0;
15e30c53	388	break;
61aabc59 EW	389	default:
	390	fprintf(stderr, "sync_update: unknown type %d\r\n", type);
	391	return -1;
15e30c53	392	}
61aabc59	393	return 0;
15e30c53	394	}