xref: /dragonfly/games/hack/hack.unix.c (revision 36a3d1d6) 
1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
2 /* hack.unix.c - version 1.0.3 */
3 /* $FreeBSD: src/games/hack/hack.unix.c,v 1.8 1999/11/16 02:57:13 billf Exp $ */
4 /* $DragonFly: src/games/hack/hack.unix.c,v 1.7 2006/08/21 19:45:32 pavalos Exp $ */
5 
6 /* This file collects some Unix dependencies; hack.pager.c contains some more */
7 
8 /*
9  * The time is used for:
10  *	- seed for random()
11  *	- year on tombstone and yymmdd in record file
12  *	- phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
13  *	- night and midnight (the undead are dangerous at midnight)
14  *	- determination of what files are "very old"
15  */
16 
17 #include <errno.h>
18 #include "hack.h"
19 
20 #include <sys/types.h>	/* for time_t and stat */
21 #include <sys/stat.h>
22 #include <time.h>
23 
24 static struct tm *getlt(void);
25 static bool  veryold(int);
26 #ifdef MAIL
27 static void  newmail(void);
28 static void  mdrush(struct monst *, bool);
29 #endif
30 
31 void
32 setrandom(void)
33 {
34 	srandomdev();
35 }
36 
37 static struct tm *
38 getlt(void)
39 {
40 	time_t date;
41 
42 	time(&date);
43 	return (localtime(&date));
44 }
45 
46 int
47 getyear(void)
48 {
49 	return (1900 + getlt()->tm_year);
50 }
51 
52 char *
53 getdate(void)
54 {
55 	static char datestr[7];
56 	struct tm *lt = getlt();
57 
58 	snprintf(datestr, sizeof(datestr), "%02d%02d%02d",
59 	    lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday);
60 	return (datestr);
61 }
62 
63 int
64 phase_of_the_moon(void)			/* 0-7, with 0: new, 4: full */
65 {					/* moon period: 29.5306 days */
66 					/* year: 365.2422 days */
67 	struct tm *lt = getlt();
68 	int epact, diy, golden;
69 
70 	diy = lt->tm_yday;
71 	golden = (lt->tm_year % 19) + 1;
72 	epact = (11 * golden + 18) % 30;
73 	if ((epact == 25 && golden > 11) || epact == 24)
74 		epact++;
75 
76 	return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7);
77 }
78 
79 bool
80 night(void)
81 {
82 	int hour = getlt()->tm_hour;
83 
84 	return (hour < 6 || hour > 21);
85 }
86 
87 bool
88 midnight(void)
89 {
90 	return (getlt()->tm_hour == 0);
91 }
92 
93 struct stat buf, hbuf;
94 
95 void
96 gethdate(const char *name)
97 {
98 /* old version - for people short of space */
99 	char *np;
100 
101 	name = "/usr/games/hide/hack";
102 	if (stat(name, &hbuf))
103 		error("Cannot get status of %s.",
104 		      (np = strrchr(name, '/')) ? np + 1 : name);
105 }
106 
107 bool
108 uptodate(int fd)
109 {
110 	if (fstat(fd, &buf)) {
111 		pline("Cannot get status of saved level? ");
112 		return (0);
113 	}
114 	if (buf.st_mtime < hbuf.st_mtime) {
115 		pline("Saved level is out of date. ");
116 		return (0);
117 	}
118 	return (1);
119 }
120 
121 /* see whether we should throw away this xlock file */
122 static bool
123 veryold(int fd)
124 {
125 	int i;
126 	time_t date;
127 
128 	if (fstat(fd, &buf))			/* cannot get status */
129 		return (0);
130 	if (buf.st_size != sizeof(int))		/* not an xlock file */
131 		return (0);
132 	time(&date);
133 	if (date - buf.st_mtime < 3L * 24L * 60L * 60L) {	/* recent */
134 		int lockedpid;	/* should be the same size as hackpid */
135 
136 		if (read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=
137 		    sizeof(lockedpid))
138 			/* strange ... */
139 			return (0);
140 
141 		/* From: Rick Adams <seismo!rick> */
142 		/* This will work on 4.1cbsd, 4.2bsd and system 3? & 5. */
143 		/* It will do nothing on V7 or 4.1bsd. */
144 		if (!(kill(lockedpid, 0) == -1 && errno == ESRCH))
145 			return (0);
146 	}
147 	close(fd);
148 	for (i = 1; i <= MAXLEVEL; i++) {	/* try to remove all */
149 		glo(i);
150 		unlink(lock);
151 	}
152 	glo(0);
153 	if (unlink(lock))			/* cannot remove it */
154 		return (0);
155 	return (1);				/* success! */
156 }
157 
158 void
159 getlock(void)
160 {
161 	int i = 0, fd;
162 
163 	fflush(stdout);
164 
165 	/* we ignore QUIT and INT at this point */
166 	if (link(HLOCK, LLOCK) == -1) {
167 		int errnosv = errno;
168 
169 		perror(HLOCK);
170 		printf("Cannot link %s to %s\n", LLOCK, HLOCK);
171 		switch (errnosv) {
172 		case ENOENT:
173 			printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
174 			break;
175 		case EACCES:
176 			printf("It seems you don't have write permission here.\n");
177 			break;
178 		case EEXIST:
179 			printf("(Try again or rm %s.)\n", LLOCK);
180 			break;
181 		default:
182 			printf("I don't know what is wrong.");
183 		}
184 		getret();
185 		error("");
186 		/* NOTREACHED */
187 	}
188 
189 	regularize(lock);
190 	glo(0);
191 	if (locknum > 25)
192 		locknum = 25;
193 
194 	do {
195 		if (locknum)
196 			lock[0] = 'a' + i++;
197 
198 		if ((fd = open(lock, O_RDONLY)) == -1) {
199 			if (errno == ENOENT)	/* no such file */
200 				goto gotlock;
201 			perror(lock);
202 			unlink(LLOCK);
203 			error("Cannot open %s", lock);
204 		}
205 
206 		if (veryold(fd)) /* if true, this closes fd and unlinks lock */
207 			goto gotlock;
208 		close(fd);
209 	} while (i < locknum);
210 
211 	unlink(LLOCK);
212 	error(locknum ? "Too many hacks running now."
213 	      : "There is a game in progress under your name.");
214 gotlock:
215 	fd = creat(lock, FMASK);
216 	if (unlink(LLOCK) == -1)
217 		error("Cannot unlink %s.", LLOCK);
218 	if (fd == -1) {
219 		error("cannot creat lock file.");
220 	} else {
221 		if (write(fd, (char *)&hackpid, sizeof(hackpid))
222 		    != sizeof(hackpid))
223 			error("cannot write lock");
224 		if (close(fd) == -1)
225 			error("cannot close lock");
226 	}
227 }
228 
229 #ifdef MAIL
230 
231 /*
232  * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
233  * I don't know the details of his implementation.]
234  * { Later note: he disliked my calling a general mailreader and felt that
235  *   hack should do the paging itself. But when I get mail, I want to put it
236  *   in some folder, reply, etc. - it would be unreasonable to put all these
237  *   functions in hack. }
238  * The mail daemon '2' is at present not a real monster, but only a visual
239  * effect. Thus, makemon() is superfluous. This might become otherwise,
240  * however. The motion of '2' is less restrained than usual: diagonal moves
241  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
242  * in a ROOM, even when you are Blind.
243  * Its path should be longer when you are Telepat-hic and Blind.
244  *
245  * Interesting side effects:
246  *	- You can get rich by sending yourself a lot of mail and selling
247  *	  it to the shopkeeper. Unfortunately mail isn't very valuable.
248  *	- You might die in case '2' comes along at a critical moment during
249  *	  a fight and delivers a scroll the weight of which causes you to
250  *	  collapse.
251  *
252  * Possible extensions:
253  *	- Open the file MAIL and do fstat instead of stat for efficiency.
254  *	  (But sh uses stat, so this cannot be too bad.)
255  *	- Examine the mail and produce a scroll of mail called "From somebody".
256  *	- Invoke MAILREADER in such a way that only this single letter is read.
257  *
258  *	- Make him lose his mail when a Nymph steals the letter.
259  *	- Do something to the text when the scroll is enchanted or cancelled.
260  */
261 #include "def.mkroom.h"
262 static struct stat omstat, nmstat;
263 static char *mailbox;
264 static long laststattime;
265 
266 void
267 getmailstatus(void)
268 {
269 	if (!(mailbox = getenv("MAIL")))
270 		return;
271 	if (stat(mailbox, &omstat)) {
272 #ifdef PERMANENT_MAILBOX
273 		pline("Cannot get status of MAIL=%s .", mailbox);
274 		mailbox = 0;
275 #else
276 		omstat.st_mtime = 0;
277 #endif /* PERMANENT_MAILBOX */
278 	}
279 }
280 
281 void
282 ckmailstatus(void)
283 {
284 	if (!mailbox
285 #ifdef MAILCKFREQ
286 	    || moves < laststattime + MAILCKFREQ
287 #endif /* MAILCKFREQ */
288 	    )
289 		return;
290 	laststattime = moves;
291 	if (stat(mailbox, &nmstat)) {
292 #ifdef PERMANENT_MAILBOX
293 		pline("Cannot get status of MAIL=%s anymore.", mailbox);
294 		mailbox = 0;
295 #else
296 		nmstat.st_mtime = 0;
297 #endif /* PERMANENT_MAILBOX */
298 	} else if (nmstat.st_mtime > omstat.st_mtime) {
299 		if (nmstat.st_size)
300 			newmail();
301 		getmailstatus();	/* might be too late ... */
302 	}
303 }
304 
305 static void
306 newmail(void)
307 {
308 	/* produce a scroll of mail */
309 	struct obj *obj;
310 	struct monst *md;
311 	extern struct permonst pm_mail_daemon;
312 
313 	obj = mksobj(SCR_MAIL);
314 	if (md = makemon(&pm_mail_daemon, u.ux, u.uy))	/* always succeeds */
315 		mdrush(md, 0);
316 
317 	pline("\"Hello, %s! I have some mail for you.\"", plname);
318 	if (md) {
319 		if (dist(md->mx, md->my) > 2)
320 			pline("\"Catch!\"");
321 		more();
322 
323 		/* let him disappear again */
324 		mdrush(md, 1);
325 		mondead(md);
326 	}
327 
328 	obj = addinv(obj);
329 	identify(obj);		/* set known and do prinv() */
330 }
331 
332 /* make md run through the cave */
333 static void
334 mdrush(struct monst *md, bool away)
335 {
336 	int uroom = inroom(u.ux, u.uy);
337 
338 	if (uroom >= 0) {
339 		int tmp = rooms[uroom].fdoor;
340 		int cnt = rooms[uroom].doorct;
341 		int fx = u.ux, fy = u.uy;
342 		while (cnt--) {
343 			if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) {
344 				fx = doors[tmp].x;
345 				fy = doors[tmp].y;
346 			}
347 			tmp++;
348 		}
349 		tmp_at(-1, md->data->mlet);	/* open call */
350 		if (away) {	/* interchange origin and destination */
351 			unpmon(md);
352 			tmp = fx;
353 			fx = md->mx;
354 			md->mx = tmp;
355 			tmp = fy;
356 			fy = md->my;
357 			md->my = tmp;
358 		}
359 		while (fx != md->mx || fy != md->my) {
360 			int dx, dy, nfx = fx, nfy = fy, d1, d2;
361 
362 			tmp_at(fx, fy);
363 			d1 = DIST(fx, fy, md->mx, md->my);
364 			for (dx = -1; dx <= 1; dx++)
365 				for (dy = -1; dy <= 1; dy++)
366 					if (dx || dy) {
367 						d2 = DIST(fx + dx, fy + dy, md->mx, md->my);
368 						if (d2 < d1) {
369 							d1 = d2;
370 							nfx = fx + dx;
371 							nfy = fy + dy;
372 						}
373 					}
374 			if (nfx != fx || nfy != fy) {
375 				fx = nfx;
376 				fy = nfy;
377 			} else {
378 				if (!away) {
379 					md->mx = fx;
380 					md->my = fy;
381 				}
382 				break;
383 			}
384 		}
385 		tmp_at(-1, -1);		/* close call */
386 	}
387 	if (!away)
388 		pmon(md);
389 }
390 
391 void
392 readmail(void)
393 {
394 #ifdef DEF_MAILREADER		/* This implies that UNIX is defined */
395 	char *mr = 0;
396 
397 	more();
398 	if (!(mr = getenv("MAILREADER")))
399 		mr = DEF_MAILREADER;
400 	if (child(1)) {
401 		execl(mr, mr, NULL);
402 		exit(1);
403 	}
404 #else /* DEF_MAILREADER */
405 	page_file(mailbox, FALSE);
406 #endif /* DEF_MAILREADER */
407        /* get new stat; not entirely correct: there is a small time
408 	* window where we do not see new mail */
409 	getmailstatus();
410 }
411 #endif /* MAIL */
412 
413 void
414 regularize(char *s)	/* normalize file name - we don't like ..'s or /'s */
415 {
416 	char *lp;
417 
418 	while ((lp = strchr(s, '.')) || (lp = strchr(s, '/')))
419 		*lp = '_';
420 }
421