hack.unix.c revision 1.9 
1/*	$NetBSD: hack.unix.c,v 1.9 2003/04/02 18:36:41 jsm Exp $	*/
2
3/*
4 * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
5 * Amsterdam
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * - Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 *
15 * - Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * - Neither the name of the Stichting Centrum voor Wiskunde en
20 * Informatica, nor the names of its contributors may be used to endorse or
21 * promote products derived from this software without specific prior
22 * written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
25 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
27 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
28 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37/*
38 * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
39 * All rights reserved.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 *    notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 *    notice, this list of conditions and the following disclaimer in the
48 *    documentation and/or other materials provided with the distribution.
49 * 3. The name of the author may not be used to endorse or promote products
50 *    derived from this software without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
53 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
54 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
55 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
56 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
57 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
58 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
59 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
60 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
61 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 */
63
64#include <sys/cdefs.h>
65#ifndef lint
66__RCSID("$NetBSD: hack.unix.c,v 1.9 2003/04/02 18:36:41 jsm Exp $");
67#endif				/* not lint */
68
69/* This file collects some Unix dependencies; hack.pager.c contains some more */
70
71/*
72 * The time is used for:
73 *	- seed for random()
74 *	- year on tombstone and yymmdd in record file
75 *	- phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
76 *	- night and midnight (the undead are dangerous at midnight)
77 *	- determination of what files are "very old"
78 */
79
80#include <errno.h>
81#include <sys/types.h>	/* for time_t and stat */
82#include <sys/stat.h>
83#ifdef BSD
84#include <sys/time.h>
85#else
86#include <time.h>
87#endif	/* BSD */
88#include <stdlib.h>
89#include <unistd.h>
90#include <signal.h>
91#include <fcntl.h>
92
93#include "hack.h"		/* mainly for strchr() which depends on BSD */
94#include "extern.h"
95
96extern int locknum;
97
98
99void
100setrandom()
101{
102	(void) srandom((int) time((time_t *) 0));
103}
104
105struct tm      *
106getlt()
107{
108	time_t          date;
109
110	(void) time(&date);
111	return (localtime(&date));
112}
113
114int
115getyear()
116{
117	return (1900 + getlt()->tm_year);
118}
119
120char           *
121getdate()
122{
123	static char     datestr[7];
124	struct tm      *lt = getlt();
125
126	(void) sprintf(datestr, "%02d%02d%02d",
127		       lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday);
128	return (datestr);
129}
130
131int
132phase_of_the_moon()
133{				/* 0-7, with 0: new, 4: full *//* moon
134				 * period: 29.5306 days */
135	/* year: 365.2422 days */
136	struct tm      *lt = getlt();
137	int             epact, diy, golden;
138
139	diy = lt->tm_yday;
140	golden = (lt->tm_year % 19) + 1;
141	epact = (11 * golden + 18) % 30;
142	if ((epact == 25 && golden > 11) || epact == 24)
143		epact++;
144
145	return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7);
146}
147
148int
149night()
150{
151	int             hour = getlt()->tm_hour;
152
153	return (hour < 6 || hour > 21);
154}
155
156int
157midnight()
158{
159	return (getlt()->tm_hour == 0);
160}
161
162struct stat     buf, hbuf;
163
164void
165gethdate(name)
166	char           *name;
167{
168#if 0
169	/* old version - for people short of space */
170
171	char *np;
172
173	if(stat(name, &hbuf))
174	    error("Cannot get status of %s.",
175		(np = strrchr(name, '/')) ? np+1 : name);
176#else
177	/* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */
178
179
180	/*
181	 * The problem with   #include	<sys/param.h>   is that this include file
182	 * does not exist on all systems, and moreover, that it sometimes includes
183	 * <sys/types.h> again, so that the compiler sees these typedefs twice.
184	 */
185#define		MAXPATHLEN	1024
186
187	const char           *np, *path;
188	char            filename[MAXPATHLEN + 1];
189	if (strchr(name, '/') != NULL || (path = getenv("PATH")) == NULL)
190		path = "";
191
192	for (;;) {
193		if ((np = strchr(path, ':')) == NULL)
194			np = path + strlen(path);	/* point to end str */
195		if (np - path <= 1)	/* %% */
196			(void) strcpy(filename, name);
197		else {
198			(void) strncpy(filename, path, np - path);
199			filename[np - path] = '/';
200			(void) strcpy(filename + (np - path) + 1, name);
201		}
202		if (stat(filename, &hbuf) == 0)
203			return;
204		if (*np == '\0')
205			break;
206		path = np + 1;
207	}
208	error("Cannot get status of %s.",
209	      (np = strrchr(name, '/')) ? np + 1 : name);
210#endif
211}
212
213int
214uptodate(int fd)
215{
216	if (fstat(fd, &buf)) {
217		pline("Cannot get status of saved level? ");
218		return (0);
219	}
220	if (buf.st_mtime < hbuf.st_mtime) {
221		pline("Saved level is out of date. ");
222		return (0);
223	}
224	return (1);
225}
226
227/* see whether we should throw away this xlock file */
228int
229veryold(fd)
230	int fd;
231{
232	int             i;
233	time_t          date;
234
235	if (fstat(fd, &buf))
236		return (0);	/* cannot get status */
237	if (buf.st_size != sizeof(int))
238		return (0);	/* not an xlock file */
239	(void) time(&date);
240	if (date - buf.st_mtime < 3L * 24L * 60L * 60L) {	/* recent */
241		int             lockedpid;	/* should be the same size as
242						 * hackpid */
243
244		if (read(fd, (char *) &lockedpid, sizeof(lockedpid)) !=
245		    sizeof(lockedpid))
246			/* strange ... */
247			return (0);
248
249		/*
250		 * From: Rick Adams <seismo!rick> This will work on
251		 * 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing
252		 * on V7 or 4.1bsd.
253		 */
254		if (!(kill(lockedpid, 0) == -1 && errno == ESRCH))
255			return (0);
256	}
257	(void) close(fd);
258	for (i = 1; i <= MAXLEVEL; i++) {	/* try to remove all */
259		glo(i);
260		(void) unlink(lock);
261	}
262	glo(0);
263	if (unlink(lock))
264		return (0);	/* cannot remove it */
265	return (1);		/* success! */
266}
267
268void
269getlock()
270{
271	int             i = 0, fd;
272
273	(void) fflush(stdout);
274
275	/* we ignore QUIT and INT at this point */
276	if (link(HLOCK, LLOCK) == -1) {
277		int             errnosv = errno;
278
279		perror(HLOCK);
280		printf("Cannot link %s to %s\n", LLOCK, HLOCK);
281		switch (errnosv) {
282		case ENOENT:
283			printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
284			break;
285		case EACCES:
286			printf("It seems you don't have write permission here.\n");
287			break;
288		case EEXIST:
289			printf("(Try again or rm %s.)\n", LLOCK);
290			break;
291		default:
292			printf("I don't know what is wrong.");
293		}
294		getret();
295		error("%s", "");
296		/* NOTREACHED */
297	}
298	regularize(lock);
299	glo(0);
300	if (locknum > 25)
301		locknum = 25;
302
303	do {
304		if (locknum)
305			lock[0] = 'a' + i++;
306
307		if ((fd = open(lock, O_RDONLY)) == -1) {
308			if (errno == ENOENT)
309				goto gotlock;	/* no such file */
310			perror(lock);
311			(void) unlink(LLOCK);
312			error("Cannot open %s", lock);
313		}
314		if (veryold(fd))/* if true, this closes fd and unlinks lock */
315			goto gotlock;
316		(void) close(fd);
317	} while (i < locknum);
318
319	(void) unlink(LLOCK);
320	error(locknum ? "Too many hacks running now."
321	      : "There is a game in progress under your name.");
322gotlock:
323	fd = creat(lock, FMASK);
324	if (unlink(LLOCK) == -1)
325		error("Cannot unlink %s.", LLOCK);
326	if (fd == -1) {
327		error("cannot creat lock file.");
328	} else {
329		if (write(fd, (char *) &hackpid, sizeof(hackpid))
330		    != sizeof(hackpid)) {
331			error("cannot write lock");
332		}
333		if (close(fd) == -1) {
334			error("cannot close lock");
335		}
336	}
337}
338
339#ifdef MAIL
340
341/*
342 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
343 * I don't know the details of his implementation.]
344 * { Later note: he disliked my calling a general mailreader and felt that
345 *   hack should do the paging itself. But when I get mail, I want to put it
346 *   in some folder, reply, etc. - it would be unreasonable to put all these
347 *   functions in hack. }
348 * The mail daemon '2' is at present not a real monster, but only a visual
349 * effect. Thus, makemon() is superfluous. This might become otherwise,
350 * however. The motion of '2' is less restrained than usual: diagonal moves
351 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
352 * in a ROOM, even when you are Blind.
353 * Its path should be longer when you are Telepat-hic and Blind.
354 *
355 * Interesting side effects:
356 *	- You can get rich by sending yourself a lot of mail and selling
357 *	  it to the shopkeeper. Unfortunately mail isn't very valuable.
358 *	- You might die in case '2' comes along at a critical moment during
359 *	  a fight and delivers a scroll the weight of which causes you to
360 *	  collapse.
361 *
362 * Possible extensions:
363 *	- Open the file MAIL and do fstat instead of stat for efficiency.
364 *	  (But sh uses stat, so this cannot be too bad.)
365 *	- Examine the mail and produce a scroll of mail called "From somebody".
366 *	- Invoke MAILREADER in such a way that only this single letter is read.
367 *
368 *	- Make him lose his mail when a Nymph steals the letter.
369 *	- Do something to the text when the scroll is enchanted or cancelled.
370 */
371#include	"def.mkroom.h"
372static struct stat omstat, nmstat;
373static char    *mailbox;
374static long     laststattime;
375
376void
377getmailstatus()
378{
379	if (!(mailbox = getenv("MAIL")))
380		return;
381	if (stat(mailbox, &omstat)) {
382#ifdef PERMANENT_MAILBOX
383		pline("Cannot get status of MAIL=%s .", mailbox);
384		mailbox = 0;
385#else
386		omstat.st_mtime = 0;
387#endif	/* PERMANENT_MAILBOX */
388	}
389}
390
391void
392ckmailstatus()
393{
394	if (!mailbox
395#ifdef MAILCKFREQ
396	    || moves < laststattime + MAILCKFREQ
397#endif	/* MAILCKFREQ */
398		)
399		return;
400	laststattime = moves;
401	if (stat(mailbox, &nmstat)) {
402#ifdef PERMANENT_MAILBOX
403		pline("Cannot get status of MAIL=%s anymore.", mailbox);
404		mailbox = 0;
405#else
406		nmstat.st_mtime = 0;
407#endif	/* PERMANENT_MAILBOX */
408	} else if (nmstat.st_mtime > omstat.st_mtime) {
409		if (nmstat.st_size)
410			newmail();
411		getmailstatus();/* might be too late ... */
412	}
413}
414
415void
416newmail()
417{
418	/* produce a scroll of mail */
419	struct obj     *obj;
420	struct monst   *md;
421
422	obj = mksobj(SCR_MAIL);
423	if (md = makemon(&pm_mail_daemon, u.ux, u.uy))	/* always succeeds */
424		mdrush(md, 0);
425
426	pline("\"Hello, %s! I have some mail for you.\"", plname);
427	if (md) {
428		if (dist(md->mx, md->my) > 2)
429			pline("\"Catch!\"");
430		more();
431
432		/* let him disappear again */
433		mdrush(md, 1);
434		mondead(md);
435	}
436	obj = addinv(obj);
437	(void) identify(obj);	/* set known and do prinv() */
438}
439
440/* make md run through the cave */
441void
442mdrush(md, away)
443	struct monst   *md;
444	boolean         away;
445{
446	int             uroom = inroom(u.ux, u.uy);
447	if (uroom >= 0) {
448		int             tmp = rooms[uroom].fdoor;
449		int             cnt = rooms[uroom].doorct;
450		int             fx = u.ux, fy = u.uy;
451		while (cnt--) {
452			if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) {
453				fx = doors[tmp].x;
454				fy = doors[tmp].y;
455			}
456			tmp++;
457		}
458		tmp_at(-1, md->data->mlet);	/* open call */
459		if (away) {	/* interchange origin and destination */
460			unpmon(md);
461			tmp = fx;
462			fx = md->mx;
463			md->mx = tmp;
464			tmp = fy;
465			fy = md->my;
466			md->my = tmp;
467		}
468		while (fx != md->mx || fy != md->my) {
469			int             dx, dy, nfx = fx, nfy = fy, d1,
470			                d2;
471
472			tmp_at(fx, fy);
473			d1 = DIST(fx, fy, md->mx, md->my);
474			for (dx = -1; dx <= 1; dx++)
475				for (dy = -1; dy <= 1; dy++)
476					if (dx || dy) {
477						d2 = DIST(fx + dx, fy + dy, md->mx, md->my);
478						if (d2 < d1) {
479							d1 = d2;
480							nfx = fx + dx;
481							nfy = fy + dy;
482						}
483					}
484			if (nfx != fx || nfy != fy) {
485				fx = nfx;
486				fy = nfy;
487			} else {
488				if (!away) {
489					md->mx = fx;
490					md->my = fy;
491				}
492				break;
493			}
494		}
495		tmp_at(-1, -1);	/* close call */
496	}
497	if (!away)
498		pmon(md);
499}
500
501void
502readmail()
503{
504#ifdef DEF_MAILREADER		/* This implies that UNIX is defined */
505	char           *mr = 0;
506	more();
507	if (!(mr = getenv("MAILREADER")))
508		mr = DEF_MAILREADER;
509	if (child(1)) {
510		execl(mr, mr, (char *) 0);
511		exit(1);
512	}
513#else	/* DEF_MAILREADER */
514	(void) page_file(mailbox, FALSE);
515#endif	/* DEF_MAILREADER */
516	/*
517	 * get new stat; not entirely correct: there is a small time window
518	 * where we do not see new mail
519	 */
520	getmailstatus();
521}
522#endif	/* MAIL */
523
524void
525regularize(s)			/* normalize file name - we don't like ..'s
526				 * or /'s */
527	char           *s;
528{
529	char           *lp;
530
531	while ((lp = strchr(s, '.')) || (lp = strchr(s, '/')))
532		*lp = '_';
533}
534