summaryrefslogtreecommitdiffstats
path: root/games/hack/hack.unix.c
blob: 03b294db8b106cbcc1774ea72826d806061da753 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.unix.c - version 1.0.3 */

/* This file collects some Unix dependencies; hack.pager.c contains some more */

/*
 * The time is used for:
 *	- seed for random()
 *	- year on tombstone and yymmdd in record file
 *	- phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
 *	- night and midnight (the undead are dangerous at midnight)
 *	- determination of what files are "very old"
 */

#include <stdio.h>
#include <errno.h>
#include "hack.h"	/* mainly for index() which depends on BSD */

#include	<sys/types.h>		/* for time_t and stat */
#include	<sys/stat.h>
#ifdef BSD
#include	<sys/time.h>
#else
#include	<time.h>
#endif BSD

extern char *getenv();
extern time_t time();

setrandom()
{
 	(void) srandom((int) time ((time_t *) 0));
}

struct tm *
getlt()
{
	time_t date;
	struct tm *localtime();

	(void) time(&date);
	return(localtime(&date));
}

getyear()
{
	return(1900 + getlt()->tm_year);
}

char *
getdate()
{
	static char datestr[7];
	register struct tm *lt = getlt();

	(void) sprintf(datestr, "%2d%2d%2d",
		lt->tm_year, lt->tm_mon + 1, lt->tm_mday);
	if(datestr[2] == ' ') datestr[2] = '0';
	if(datestr[4] == ' ') datestr[4] = '0';
	return(datestr);
}

phase_of_the_moon()			/* 0-7, with 0: new, 4: full */
{					/* moon period: 29.5306 days */
					/* year: 365.2422 days */
	register struct tm *lt = getlt();
	register int epact, diy, golden;

	diy = lt->tm_yday;
	golden = (lt->tm_year % 19) + 1;
	epact = (11 * golden + 18) % 30;
	if ((epact == 25 && golden > 11) || epact == 24)
		epact++;

	return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 );
}

night()
{
	register int hour = getlt()->tm_hour;

	return(hour < 6 || hour > 21);
}

midnight()
{
	return(getlt()->tm_hour == 0);
}

struct stat buf, hbuf;

gethdate(name) char *name; {
/* old version - for people short of space */
/*
/* register char *np;
/*	if(stat(name, &hbuf))
/*		error("Cannot get status of %s.",
/*			(np = rindex(name, '/')) ? np+1 : name);
/*
/* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */


/*
 * The problem with   #include	<sys/param.h>   is that this include file
 * does not exist on all systems, and moreover, that it sometimes includes
 * <sys/types.h> again, so that the compiler sees these typedefs twice.
 */
#define		MAXPATHLEN	1024

register char *np, *path;
char filename[MAXPATHLEN+1];
	if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL)
		path = "";

	for (;;) {
		if ((np = index(path, ':')) == NULL)
			np = path + strlen(path);	/* point to end str */
		if (np - path <= 1)			/* %% */
			(void) strcpy(filename, name);
		else {
			(void) strncpy(filename, path, np - path);
			filename[np - path] = '/';
			(void) strcpy(filename + (np - path) + 1, name);
		}
		if (stat(filename, &hbuf) == 0)
			return;
		if (*np == '\0')
			break;
		path = np + 1;
	}
	error("Cannot get status of %s.",
		(np = rindex(name, '/')) ? np+1 : name);
}

uptodate(fd) {
	if(fstat(fd, &buf)) {
		pline("Cannot get status of saved level? ");
		return(0);
	}
	if(buf.st_mtime < hbuf.st_mtime) {
		pline("Saved level is out of date. ");
		return(0);
	}
	return(1);
}

/* see whether we should throw away this xlock file */
veryold(fd) {
	register int i;
	time_t date;

	if(fstat(fd, &buf)) return(0);			/* cannot get status */
	if(buf.st_size != sizeof(int)) return(0);	/* not an xlock file */
	(void) time(&date);
	if(date - buf.st_mtime < 3L*24L*60L*60L) {	/* recent */
		extern int errno;
		int lockedpid;	/* should be the same size as hackpid */

		if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=
			sizeof(lockedpid))
			/* strange ... */
			return(0);

		/* From: Rick Adams <seismo!rick>
		/* This will work on 4.1cbsd, 4.2bsd and system 3? & 5.
		/* It will do nothing on V7 or 4.1bsd. */
		if(!(kill(lockedpid, 0) == -1 && errno == ESRCH))
			return(0);
	}
	(void) close(fd);
	for(i = 1; i <= MAXLEVEL; i++) {		/* try to remove all */
		glo(i);
		(void) unlink(lock);
	}
	glo(0);
	if(unlink(lock)) return(0);			/* cannot remove it */
	return(1);					/* success! */
}

getlock()
{
	extern int errno, hackpid, locknum;
	register int i = 0, fd;

	(void) fflush(stdout);

	/* we ignore QUIT and INT at this point */
	if (link(HLOCK, LLOCK) == -1) {
		register int errnosv = errno;

		perror(HLOCK);
		printf("Cannot link %s to %s\n", LLOCK, HLOCK);
		switch(errnosv) {
		case ENOENT:
		    printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
		    break;
		case EACCES:
		    printf("It seems you don't have write permission here.\n");
		    break;
		case EEXIST:
		    printf("(Try again or rm %s.)\n", LLOCK);
		    break;
		default:
		    printf("I don't know what is wrong.");
		}
		getret();
		error("");
		/*NOTREACHED*/
	}

	regularize(lock);
	glo(0);
	if(locknum > 25) locknum = 25;

	do {
		if(locknum) lock[0] = 'a' + i++;

		if((fd = open(lock, 0)) == -1) {
			if(errno == ENOENT) goto gotlock;    /* no such file */
			perror(lock);
			(void) unlink(LLOCK);
			error("Cannot open %s", lock);
		}

		if(veryold(fd))	/* if true, this closes fd and unlinks lock */
			goto gotlock;
		(void) close(fd);
	} while(i < locknum);

	(void) unlink(LLOCK);
	error(locknum ? "Too many hacks running now."
		      : "There is a game in progress under your name.");
gotlock:
	fd = creat(lock, FMASK);
	if(unlink(LLOCK) == -1)
		error("Cannot unlink %s.", LLOCK);
	if(fd == -1) {
		error("cannot creat lock file.");
	} else {
		if(write(fd, (char *) &hackpid, sizeof(hackpid))
		    != sizeof(hackpid)){
			error("cannot write lock");
		}
		if(close(fd) == -1) {
			error("cannot close lock");
		}
	}
}	

#ifdef MAIL

/*
 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
 * I don't know the details of his implementation.]
 * { Later note: he disliked my calling a general mailreader and felt that
 *   hack should do the paging itself. But when I get mail, I want to put it
 *   in some folder, reply, etc. - it would be unreasonable to put all these
 *   functions in hack. }
 * The mail daemon '2' is at present not a real monster, but only a visual
 * effect. Thus, makemon() is superfluous. This might become otherwise,
 * however. The motion of '2' is less restrained than usual: diagonal moves
 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
 * in a ROOM, even when you are Blind.
 * Its path should be longer when you are Telepat-hic and Blind.
 *
 * Interesting side effects:
 *	- You can get rich by sending yourself a lot of mail and selling
 *	  it to the shopkeeper. Unfortunately mail isn't very valuable.
 *	- You might die in case '2' comes along at a critical moment during
 *	  a fight and delivers a scroll the weight of which causes you to
 *	  collapse.
 *
 * Possible extensions:
 *	- Open the file MAIL and do fstat instead of stat for efficiency.
 *	  (But sh uses stat, so this cannot be too bad.)
 *	- Examine the mail and produce a scroll of mail called "From somebody".
 *	- Invoke MAILREADER in such a way that only this single letter is read.
 *
 *	- Make him lose his mail when a Nymph steals the letter.
 *	- Do something to the text when the scroll is enchanted or cancelled.
 */
#include	"def.mkroom.h"
static struct stat omstat,nmstat;
static char *mailbox;
static long laststattime;

getmailstatus() {
	if(!(mailbox = getenv("MAIL")))
		return;
	if(stat(mailbox, &omstat)){
#ifdef PERMANENT_MAILBOX
		pline("Cannot get status of MAIL=%s .", mailbox);
		mailbox = 0;
#else
		omstat.st_mtime = 0;
#endif PERMANENT_MAILBOX
	}
}

ckmailstatus() {
	if(!mailbox
#ifdef MAILCKFREQ
		    || moves < laststattime + MAILCKFREQ
#endif MAILCKFREQ
							)
		return;
	laststattime = moves;
	if(stat(mailbox, &nmstat)){
#ifdef PERMANENT_MAILBOX
		pline("Cannot get status of MAIL=%s anymore.", mailbox);
		mailbox = 0;
#else
		nmstat.st_mtime = 0;
#endif PERMANENT_MAILBOX
	} else if(nmstat.st_mtime > omstat.st_mtime) {
		if(nmstat.st_size)
			newmail();
		getmailstatus();	/* might be too late ... */
	}
}

newmail() {
	/* produce a scroll of mail */
	register struct obj *obj;
	register struct monst *md;
	extern char plname[];
	extern struct obj *mksobj(), *addinv();
	extern struct monst *makemon();
	extern struct permonst pm_mail_daemon;

	obj = mksobj(SCR_MAIL);
	if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */
		mdrush(md,0);

	pline("\"Hello, %s! I have some mail for you.\"", plname);
	if(md) {
		if(dist(md->mx,md->my) > 2)
			pline("\"Catch!\"");
		more();

		/* let him disappear again */
		mdrush(md,1);
		mondead(md);
	}

	obj = addinv(obj);
	(void) identify(obj);		/* set known and do prinv() */
}

/* make md run through the cave */
mdrush(md,away)
register struct monst *md;
boolean away;
{
	register int uroom = inroom(u.ux, u.uy);
	if(uroom >= 0) {
		register int tmp = rooms[uroom].fdoor;
		register int cnt = rooms[uroom].doorct;
		register int fx = u.ux, fy = u.uy;
		while(cnt--) {
			if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){
				fx = doors[tmp].x;
				fy = doors[tmp].y;
			}
			tmp++;
		}
		tmp_at(-1, md->data->mlet);	/* open call */
		if(away) {	/* interchange origin and destination */
			unpmon(md);
			tmp = fx; fx = md->mx; md->mx = tmp;
			tmp = fy; fy = md->my; md->my = tmp;
		}
		while(fx != md->mx || fy != md->my) {
			register int dx,dy,nfx = fx,nfy = fy,d1,d2;

			tmp_at(fx,fy);
			d1 = DIST(fx,fy,md->mx,md->my);
			for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++)
			    if(dx || dy) {
				d2 = DIST(fx+dx,fy+dy,md->mx,md->my);
				if(d2 < d1) {
				    d1 = d2;
				    nfx = fx+dx;
				    nfy = fy+dy;
				}
			    }
			if(nfx != fx || nfy != fy) {
			    fx = nfx;
			    fy = nfy;
			} else {
			    if(!away) {
				md->mx = fx;
				md->my = fy;
			    }
			    break;
			} 
		}
		tmp_at(-1,-1);			/* close call */
	}
	if(!away)
		pmon(md);
}

readmail() {
#ifdef DEF_MAILREADER			/* This implies that UNIX is defined */
	register char *mr = 0;
	more();
	if(!(mr = getenv("MAILREADER")))
		mr = DEF_MAILREADER;
	if(child(1)){
		execl(mr, mr, (char *) 0);
		exit(1);
	}
#else DEF_MAILREADER
	(void) page_file(mailbox, FALSE);
#endif DEF_MAILREADER
	/* get new stat; not entirely correct: there is a small time
	   window where we do not see new mail */
	getmailstatus();
}
#endif MAIL

regularize(s)	/* normalize file name - we don't like ..'s or /'s */
register char *s;
{
	register char *lp;

	while((lp = index(s, '.')) || (lp = index(s, '/')))
		*lp = '_';
}
OpenPOWER on IntegriCloud