xref: /dragonfly/games/hack/hack.unix.c (revision 2cd2d2b5) 
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 1.2 2003/06/17 04:25:24 dillon 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 <stdio.h>
18 #include <errno.h>
19 #include <stdlib.h>
20 #include "hack.h"	/* mainly for index() which depends on BSD */
21 
22 #include	<sys/types.h>		/* for time_t and stat */
23 #include	<sys/stat.h>
24 #include	<time.h>
25 
26 setrandom()
27 {
28 	(void) srandomdev();
29 }
30 
31 struct tm *
32 getlt()
33 {
34 	time_t date;
35 	struct tm *localtime();
36 
37 	(void) time(&date);
38 	return(localtime(&date));
39 }
40 
41 getyear()
42 {
43 	return(1900 + getlt()->tm_year);
44 }
45 
46 char *
47 getdate()
48 {
49 	static char datestr[7];
50 	struct tm *lt = getlt();
51 
52 	(void) snprintf(datestr, sizeof(datestr), "%02d%02d%02d",
53 		lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday);
54 	return(datestr);
55 }
56 
57 phase_of_the_moon()			/* 0-7, with 0: new, 4: full */
58 {					/* moon period: 29.5306 days */
59 					/* year: 365.2422 days */
60 	struct tm *lt = getlt();
61 	int epact, diy, golden;
62 
63 	diy = lt->tm_yday;
64 	golden = (lt->tm_year % 19) + 1;
65 	epact = (11 * golden + 18) % 30;
66 	if ((epact == 25 && golden > 11) || epact == 24)
67 		epact++;
68 
69 	return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 );
70 }
71 
72 night()
73 {
74 	int hour = getlt()->tm_hour;
75 
76 	return(hour < 6 || hour > 21);
77 }
78 
79 midnight()
80 {
81 	return(getlt()->tm_hour == 0);
82 }
83 
84 struct stat buf, hbuf;
85 
86 gethdate(name) char *name; {
87 /* old version - for people short of space */
88 char *np;
89 
90 	name = "/usr/games/hide/hack";
91 	if(stat(name, &hbuf))
92 		error("Cannot get status of %s.",
93 			(np = rindex(name, '/')) ? np+1 : name);
94 #if 0
95 /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */
96 
97 
98 /*
99  * The problem with   #include	<sys/param.h>   is that this include file
100  * does not exist on all systems, and moreover, that it sometimes includes
101  * <sys/types.h> again, so that the compiler sees these typedefs twice.
102  */
103 #define		MAXPATHLEN	1024
104 
105 char *np, *path;
106 char filename[MAXPATHLEN+1];
107 	if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL)
108 		path = "";
109 
110 	for (;;) {
111 		if ((np = index(path, ':')) == NULL)
112 			np = path + strlen(path);	/* point to end str */
113 		if (np - path <= 1)			/* %% */
114 			(void) strcpy(filename, name);
115 		else {
116 			(void) strncpy(filename, path, np - path);
117 			filename[np - path] = '/';
118 			(void) strcpy(filename + (np - path) + 1, name);
119 		}
120 		if (stat(filename, &hbuf) == 0)
121 			return;
122 		if (*np == '\0')
123 			break;
124 		path = np + 1;
125 	}
126 	error("Cannot get status of %s.",
127 		(np = rindex(name, '/')) ? np+1 : name);
128 #endif
129 }
130 
131 uptodate(fd) {
132 	if(fstat(fd, &buf)) {
133 		pline("Cannot get status of saved level? ");
134 		return(0);
135 	}
136 	if(buf.st_mtime < hbuf.st_mtime) {
137 		pline("Saved level is out of date. ");
138 		return(0);
139 	}
140 	return(1);
141 }
142 
143 /* see whether we should throw away this xlock file */
144 veryold(fd) {
145 	int i;
146 	time_t date;
147 
148 	if(fstat(fd, &buf)) return(0);			/* cannot get status */
149 	if(buf.st_size != sizeof(int)) return(0);	/* not an xlock file */
150 	(void) time(&date);
151 	if(date - buf.st_mtime < 3L*24L*60L*60L) {	/* recent */
152 		extern int errno;
153 		int lockedpid;	/* should be the same size as hackpid */
154 
155 		if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=
156 			sizeof(lockedpid))
157 			/* strange ... */
158 			return(0);
159 
160 		/* From: Rick Adams <seismo!rick> */
161 		/* This will work on 4.1cbsd, 4.2bsd and system 3? & 5. */
162 		/* It will do nothing on V7 or 4.1bsd. */
163 		if(!(kill(lockedpid, 0) == -1 && errno == ESRCH))
164 			return(0);
165 	}
166 	(void) close(fd);
167 	for(i = 1; i <= MAXLEVEL; i++) {		/* try to remove all */
168 		glo(i);
169 		(void) unlink(lock);
170 	}
171 	glo(0);
172 	if(unlink(lock)) return(0);			/* cannot remove it */
173 	return(1);					/* success! */
174 }
175 
176 getlock()
177 {
178 	extern int errno, hackpid, locknum;
179 	int i = 0, fd;
180 
181 	(void) fflush(stdout);
182 
183 	/* we ignore QUIT and INT at this point */
184 	if (link(HLOCK, LLOCK) == -1) {
185 		int errnosv = errno;
186 
187 		perror(HLOCK);
188 		printf("Cannot link %s to %s\n", LLOCK, HLOCK);
189 		switch(errnosv) {
190 		case ENOENT:
191 		    printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
192 		    break;
193 		case EACCES:
194 		    printf("It seems you don't have write permission here.\n");
195 		    break;
196 		case EEXIST:
197 		    printf("(Try again or rm %s.)\n", LLOCK);
198 		    break;
199 		default:
200 		    printf("I don't know what is wrong.");
201 		}
202 		getret();
203 		error("");
204 		/*NOTREACHED*/
205 	}
206 
207 	regularize(lock);
208 	glo(0);
209 	if(locknum > 25) locknum = 25;
210 
211 	do {
212 		if(locknum) lock[0] = 'a' + i++;
213 
214 		if((fd = open(lock, 0)) == -1) {
215 			if(errno == ENOENT) goto gotlock;    /* no such file */
216 			perror(lock);
217 			(void) unlink(LLOCK);
218 			error("Cannot open %s", lock);
219 		}
220 
221 		if(veryold(fd))	/* if true, this closes fd and unlinks lock */
222 			goto gotlock;
223 		(void) close(fd);
224 	} while(i < locknum);
225 
226 	(void) unlink(LLOCK);
227 	error(locknum ? "Too many hacks running now."
228 		      : "There is a game in progress under your name.");
229 gotlock:
230 	fd = creat(lock, FMASK);
231 	if(unlink(LLOCK) == -1)
232 		error("Cannot unlink %s.", LLOCK);
233 	if(fd == -1) {
234 		error("cannot creat lock file.");
235 	} else {
236 		if(write(fd, (char *) &hackpid, sizeof(hackpid))
237 		    != sizeof(hackpid)){
238 			error("cannot write lock");
239 		}
240 		if(close(fd) == -1) {
241 			error("cannot close lock");
242 		}
243 	}
244 }
245 
246 #ifdef MAIL
247 
248 /*
249  * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
250  * I don't know the details of his implementation.]
251  * { Later note: he disliked my calling a general mailreader and felt that
252  *   hack should do the paging itself. But when I get mail, I want to put it
253  *   in some folder, reply, etc. - it would be unreasonable to put all these
254  *   functions in hack. }
255  * The mail daemon '2' is at present not a real monster, but only a visual
256  * effect. Thus, makemon() is superfluous. This might become otherwise,
257  * however. The motion of '2' is less restrained than usual: diagonal moves
258  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
259  * in a ROOM, even when you are Blind.
260  * Its path should be longer when you are Telepat-hic and Blind.
261  *
262  * Interesting side effects:
263  *	- You can get rich by sending yourself a lot of mail and selling
264  *	  it to the shopkeeper. Unfortunately mail isn't very valuable.
265  *	- You might die in case '2' comes along at a critical moment during
266  *	  a fight and delivers a scroll the weight of which causes you to
267  *	  collapse.
268  *
269  * Possible extensions:
270  *	- Open the file MAIL and do fstat instead of stat for efficiency.
271  *	  (But sh uses stat, so this cannot be too bad.)
272  *	- Examine the mail and produce a scroll of mail called "From somebody".
273  *	- Invoke MAILREADER in such a way that only this single letter is read.
274  *
275  *	- Make him lose his mail when a Nymph steals the letter.
276  *	- Do something to the text when the scroll is enchanted or cancelled.
277  */
278 #include	"def.mkroom.h"
279 static struct stat omstat,nmstat;
280 static char *mailbox;
281 static long laststattime;
282 
283 getmailstatus() {
284 	if(!(mailbox = getenv("MAIL")))
285 		return;
286 	if(stat(mailbox, &omstat)){
287 #ifdef PERMANENT_MAILBOX
288 		pline("Cannot get status of MAIL=%s .", mailbox);
289 		mailbox = 0;
290 #else
291 		omstat.st_mtime = 0;
292 #endif PERMANENT_MAILBOX
293 	}
294 }
295 
296 ckmailstatus() {
297 	if(!mailbox
298 #ifdef MAILCKFREQ
299 		    || moves < laststattime + MAILCKFREQ
300 #endif MAILCKFREQ
301 							)
302 		return;
303 	laststattime = moves;
304 	if(stat(mailbox, &nmstat)){
305 #ifdef PERMANENT_MAILBOX
306 		pline("Cannot get status of MAIL=%s anymore.", mailbox);
307 		mailbox = 0;
308 #else
309 		nmstat.st_mtime = 0;
310 #endif PERMANENT_MAILBOX
311 	} else if(nmstat.st_mtime > omstat.st_mtime) {
312 		if(nmstat.st_size)
313 			newmail();
314 		getmailstatus();	/* might be too late ... */
315 	}
316 }
317 
318 newmail() {
319 	/* produce a scroll of mail */
320 	struct obj *obj;
321 	struct monst *md;
322 	extern char plname[];
323 	extern struct obj *mksobj(), *addinv();
324 	extern struct monst *makemon();
325 	extern struct permonst pm_mail_daemon;
326 
327 	obj = mksobj(SCR_MAIL);
328 	if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */
329 		mdrush(md,0);
330 
331 	pline("\"Hello, %s! I have some mail for you.\"", plname);
332 	if(md) {
333 		if(dist(md->mx,md->my) > 2)
334 			pline("\"Catch!\"");
335 		more();
336 
337 		/* let him disappear again */
338 		mdrush(md,1);
339 		mondead(md);
340 	}
341 
342 	obj = addinv(obj);
343 	(void) identify(obj);		/* set known and do prinv() */
344 }
345 
346 /* make md run through the cave */
347 mdrush(md,away)
348 struct monst *md;
349 boolean away;
350 {
351 	int uroom = inroom(u.ux, u.uy);
352 	if(uroom >= 0) {
353 		int tmp = rooms[uroom].fdoor;
354 		int cnt = rooms[uroom].doorct;
355 		int fx = u.ux, fy = u.uy;
356 		while(cnt--) {
357 			if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){
358 				fx = doors[tmp].x;
359 				fy = doors[tmp].y;
360 			}
361 			tmp++;
362 		}
363 		tmp_at(-1, md->data->mlet);	/* open call */
364 		if(away) {	/* interchange origin and destination */
365 			unpmon(md);
366 			tmp = fx; fx = md->mx; md->mx = tmp;
367 			tmp = fy; fy = md->my; md->my = tmp;
368 		}
369 		while(fx != md->mx || fy != md->my) {
370 			int dx,dy,nfx = fx,nfy = fy,d1,d2;
371 
372 			tmp_at(fx,fy);
373 			d1 = DIST(fx,fy,md->mx,md->my);
374 			for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++)
375 			    if(dx || dy) {
376 				d2 = DIST(fx+dx,fy+dy,md->mx,md->my);
377 				if(d2 < d1) {
378 				    d1 = d2;
379 				    nfx = fx+dx;
380 				    nfy = fy+dy;
381 				}
382 			    }
383 			if(nfx != fx || nfy != fy) {
384 			    fx = nfx;
385 			    fy = nfy;
386 			} else {
387 			    if(!away) {
388 				md->mx = fx;
389 				md->my = fy;
390 			    }
391 			    break;
392 			}
393 		}
394 		tmp_at(-1,-1);			/* close call */
395 	}
396 	if(!away)
397 		pmon(md);
398 }
399 
400 readmail() {
401 #ifdef DEF_MAILREADER			/* This implies that UNIX is defined */
402 	char *mr = 0;
403 	more();
404 	if(!(mr = getenv("MAILREADER")))
405 		mr = DEF_MAILREADER;
406 	if(child(1)){
407 		execl(mr, mr, (char *) 0);
408 		exit(1);
409 	}
410 #else DEF_MAILREADER
411 	(void) page_file(mailbox, FALSE);
412 #endif DEF_MAILREADER
413 	/* get new stat; not entirely correct: there is a small time
414 	   window where we do not see new mail */
415 	getmailstatus();
416 }
417 #endif MAIL
418 
419 regularize(s)	/* normalize file name - we don't like ..'s or /'s */
420 char *s;
421 {
422 	char *lp;
423 
424 	while((lp = index(s, '.')) || (lp = index(s, '/')))
425 		*lp = '_';
426 }
427