1 /* $NetBSD: hack.unix.c,v 1.18 2019/02/03 10:48:46 mrg 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 /* This file collects some Unix dependencies; hack.pager.c contains some more */
65
66 /*
67 * The time is used for:
68 * - seed for random()
69 * - year on tombstone and yymmdd in record file
70 * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
71 * - night and midnight (the undead are dangerous at midnight)
72 * - determination of what files are "very old"
73 */
74
75 #include <errno.h>
76 #include <sys/types.h> /* for time_t and stat */
77 #include <sys/stat.h>
78 #ifdef BSD
79 #include <sys/time.h>
80 #else
81 #include <time.h>
82 #endif /* BSD */
83 #include <stdlib.h>
84 #include <unistd.h>
85 #include <signal.h>
86 #include <fcntl.h>
87
88 #include "hack.h" /* mainly for strchr() which depends on BSD */
89 #include "extern.h"
90
91 extern int locknum;
92
93 static struct tm *getlt(void);
94 static int veryold(int);
95
96
97 void
setrandom(void)98 setrandom(void)
99 {
100 (void) srandom((int) time((time_t *) 0));
101 }
102
103 static struct tm *
getlt(void)104 getlt(void)
105 {
106 time_t date;
107
108 (void) time(&date);
109 return (localtime(&date));
110 }
111
112 int
getyear(void)113 getyear(void)
114 {
115 return (1900 + getlt()->tm_year);
116 }
117
118 char *
getdatestr(void)119 getdatestr(void)
120 {
121 static char datestr[32];
122 struct tm *lt = getlt();
123
124 (void) snprintf(datestr, sizeof(datestr), "%02d%02d%02d",
125 lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday);
126 return (datestr);
127 }
128
129 int
phase_of_the_moon(void)130 phase_of_the_moon(void)
131 { /* 0-7, with 0: new, 4: full *//* moon
132 * period: 29.5306 days */
133 /* year: 365.2422 days */
134 struct tm *lt = getlt();
135 int epact, diy, golden;
136
137 diy = lt->tm_yday;
138 golden = (lt->tm_year % 19) + 1;
139 epact = (11 * golden + 18) % 30;
140 if ((epact == 25 && golden > 11) || epact == 24)
141 epact++;
142
143 return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7);
144 }
145
146 int
night(void)147 night(void)
148 {
149 int hour = getlt()->tm_hour;
150
151 return (hour < 6 || hour > 21);
152 }
153
154 int
midnight(void)155 midnight(void)
156 {
157 return (getlt()->tm_hour == 0);
158 }
159
160 static struct stat buf, hbuf;
161
162 void
gethdate(char * name)163 gethdate(char *name)
164 {
165 #if 0
166 /* old version - for people short of space */
167
168 char *np;
169
170 if(stat(name, &hbuf))
171 error("Cannot get status of %s.",
172 (np = strrchr(name, '/')) ? np+1 : name);
173 #else
174 /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */
175
176
177 /*
178 * The problem with #include <sys/param.h> is that this include file
179 * does not exist on all systems, and moreover, that it sometimes includes
180 * <sys/types.h> again, so that the compiler sees these typedefs twice.
181 */
182 #define MAXPATHLEN 1024
183
184 const char *np, *path;
185 char filename[MAXPATHLEN + 1];
186 if (strchr(name, '/') != NULL || (path = getenv("PATH")) == NULL)
187 path = "";
188
189 for (;;) {
190 if ((np = strchr(path, ':')) == NULL)
191 np = path + strlen(path); /* point to end str */
192 if (np - path <= 1) /* %% */
193 (void) strlcpy(filename, name, sizeof(filename));
194 else {
195 (void) snprintf(filename, sizeof(filename),
196 "%.*s/%s",
197 (int)(np - path), path, name);
198 }
199 if (stat(filename, &hbuf) == 0)
200 return;
201 if (*np == '\0')
202 break;
203 path = np + 1;
204 }
205 error("Cannot get status of %s.",
206 (np = strrchr(name, '/')) ? np + 1 : name);
207 #endif
208 }
209
210 int
uptodate(int fd)211 uptodate(int fd)
212 {
213 if (fstat(fd, &buf)) {
214 pline("Cannot get status of saved level? ");
215 return (0);
216 }
217 if (buf.st_mtime < hbuf.st_mtime) {
218 pline("Saved level is out of date. ");
219 return (0);
220 }
221 return (1);
222 }
223
224 /* see whether we should throw away this xlock file */
225 static int
veryold(int fd)226 veryold(int fd)
227 {
228 int i;
229 time_t date;
230
231 if (fstat(fd, &buf))
232 return (0); /* cannot get status */
233 if (buf.st_size != sizeof(int))
234 return (0); /* not an xlock file */
235 (void) time(&date);
236 if (date - buf.st_mtime < 3L * 24L * 60L * 60L) { /* recent */
237 int lockedpid; /* should be the same size as
238 * hackpid */
239
240 if (read(fd, &lockedpid, sizeof(lockedpid)) !=
241 sizeof(lockedpid))
242 /* strange ... */
243 return (0);
244
245 /*
246 * From: Rick Adams <seismo!rick> This will work on
247 * 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing
248 * on V7 or 4.1bsd.
249 */
250 if (!(kill(lockedpid, 0) == -1 && errno == ESRCH))
251 return (0);
252 }
253 (void) close(fd);
254 for (i = 1; i <= MAXLEVEL; i++) { /* try to remove all */
255 glo(i);
256 (void) unlink(lock);
257 }
258 glo(0);
259 if (unlink(lock))
260 return (0); /* cannot remove it */
261 return (1); /* success! */
262 }
263
264 void
getlock(void)265 getlock(void)
266 {
267 int i = 0, fd;
268
269 (void) fflush(stdout);
270
271 /* we ignore QUIT and INT at this point */
272 if (link(HLOCK, LLOCK) == -1) {
273 int errnosv = errno;
274
275 perror(HLOCK);
276 printf("Cannot link %s to %s\n", LLOCK, HLOCK);
277 switch (errnosv) {
278 case ENOENT:
279 printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
280 break;
281 case EACCES:
282 printf("It seems you don't have write permission here.\n");
283 break;
284 case EEXIST:
285 printf("(Try again or rm %s.)\n", LLOCK);
286 break;
287 default:
288 printf("I don't know what is wrong.");
289 }
290 getret();
291 error("%s", "");
292 /* NOTREACHED */
293 }
294 regularize(lock);
295 glo(0);
296 if (locknum > 25)
297 locknum = 25;
298
299 do {
300 if (locknum)
301 lock[0] = 'a' + i++;
302
303 if ((fd = open(lock, O_RDONLY)) == -1) {
304 if (errno == ENOENT)
305 goto gotlock; /* no such file */
306 perror(lock);
307 (void) unlink(LLOCK);
308 error("Cannot open %s", lock);
309 }
310 if (veryold(fd))/* if true, this closes fd and unlinks lock */
311 goto gotlock;
312 (void) close(fd);
313 } while (i < locknum);
314
315 (void) unlink(LLOCK);
316 error(locknum ? "Too many hacks running now."
317 : "There is a game in progress under your name.");
318 gotlock:
319 fd = creat(lock, FMASK);
320 if (unlink(LLOCK) == -1)
321 error("Cannot unlink %s.", LLOCK);
322 if (fd == -1) {
323 error("cannot creat lock file.");
324 } else {
325 if (write(fd, &hackpid, sizeof(hackpid))
326 != sizeof(hackpid)) {
327 error("cannot write lock");
328 }
329 if (close(fd) == -1) {
330 error("cannot close lock");
331 }
332 }
333 }
334
335 #ifdef MAIL
336
337 /*
338 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
339 * I don't know the details of his implementation.]
340 * { Later note: he disliked my calling a general mailreader and felt that
341 * hack should do the paging itself. But when I get mail, I want to put it
342 * in some folder, reply, etc. - it would be unreasonable to put all these
343 * functions in hack. }
344 * The mail daemon '2' is at present not a real monster, but only a visual
345 * effect. Thus, makemon() is superfluous. This might become otherwise,
346 * however. The motion of '2' is less restrained than usual: diagonal moves
347 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
348 * in a ROOM, even when you are Blind.
349 * Its path should be longer when you are Telepat-hic and Blind.
350 *
351 * Interesting side effects:
352 * - You can get rich by sending yourself a lot of mail and selling
353 * it to the shopkeeper. Unfortunately mail isn't very valuable.
354 * - You might die in case '2' comes along at a critical moment during
355 * a fight and delivers a scroll the weight of which causes you to
356 * collapse.
357 *
358 * Possible extensions:
359 * - Open the file MAIL and do fstat instead of stat for efficiency.
360 * (But sh uses stat, so this cannot be too bad.)
361 * - Examine the mail and produce a scroll of mail called "From somebody".
362 * - Invoke MAILREADER in such a way that only this single letter is read.
363 *
364 * - Make him lose his mail when a Nymph steals the letter.
365 * - Do something to the text when the scroll is enchanted or cancelled.
366 */
367 #include "def.mkroom.h"
368 static struct stat omstat, nmstat;
369 static char *mailbox;
370 static long laststattime;
371
372 void
getmailstatus(void)373 getmailstatus(void)
374 {
375 if (!(mailbox = getenv("MAIL")))
376 return;
377 if (stat(mailbox, &omstat)) {
378 #ifdef PERMANENT_MAILBOX
379 pline("Cannot get status of MAIL=%s .", mailbox);
380 mailbox = 0;
381 #else
382 omstat.st_mtime = 0;
383 #endif /* PERMANENT_MAILBOX */
384 }
385 }
386
387 void
ckmailstatus(void)388 ckmailstatus(void)
389 {
390 if (!mailbox
391 #ifdef MAILCKFREQ
392 || moves < laststattime + MAILCKFREQ
393 #endif /* MAILCKFREQ */
394 )
395 return;
396 laststattime = moves;
397 if (stat(mailbox, &nmstat)) {
398 #ifdef PERMANENT_MAILBOX
399 pline("Cannot get status of MAIL=%s anymore.", mailbox);
400 mailbox = 0;
401 #else
402 nmstat.st_mtime = 0;
403 #endif /* PERMANENT_MAILBOX */
404 } else if (nmstat.st_mtime > omstat.st_mtime) {
405 if (nmstat.st_size)
406 newmail();
407 getmailstatus();/* might be too late ... */
408 }
409 }
410
411 void
newmail(void)412 newmail(void)
413 {
414 /* produce a scroll of mail */
415 struct obj *obj;
416 struct monst *md;
417
418 obj = mksobj(SCR_MAIL);
419 if (md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */
420 mdrush(md, 0);
421
422 pline("\"Hello, %s! I have some mail for you.\"", plname);
423 if (md) {
424 if (dist(md->mx, md->my) > 2)
425 pline("\"Catch!\"");
426 more();
427
428 /* let him disappear again */
429 mdrush(md, 1);
430 mondead(md);
431 }
432 obj = addinv(obj);
433 (void) identify(obj); /* set known and do prinv() */
434 }
435
436 /* make md run through the cave */
437 void
mdrush(struct monst * md,boolean away)438 mdrush(struct monst *md, boolean away)
439 {
440 int uroom = inroom(u.ux, u.uy);
441 if (uroom >= 0) {
442 int tmp = rooms[uroom].fdoor;
443 int cnt = rooms[uroom].doorct;
444 int fx = u.ux, fy = u.uy;
445 while (cnt--) {
446 if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) {
447 fx = doors[tmp].x;
448 fy = doors[tmp].y;
449 }
450 tmp++;
451 }
452 tmp_at(-1, md->data->mlet); /* open call */
453 if (away) { /* interchange origin and destination */
454 unpmon(md);
455 tmp = fx;
456 fx = md->mx;
457 md->mx = tmp;
458 tmp = fy;
459 fy = md->my;
460 md->my = tmp;
461 }
462 while (fx != md->mx || fy != md->my) {
463 int dx, dy, nfx = fx, nfy = fy, d1,
464 d2;
465
466 tmp_at(fx, fy);
467 d1 = DIST(fx, fy, md->mx, md->my);
468 for (dx = -1; dx <= 1; dx++)
469 for (dy = -1; dy <= 1; dy++)
470 if (dx || dy) {
471 d2 = DIST(fx + dx, fy + dy, md->mx, md->my);
472 if (d2 < d1) {
473 d1 = d2;
474 nfx = fx + dx;
475 nfy = fy + dy;
476 }
477 }
478 if (nfx != fx || nfy != fy) {
479 fx = nfx;
480 fy = nfy;
481 } else {
482 if (!away) {
483 md->mx = fx;
484 md->my = fy;
485 }
486 break;
487 }
488 }
489 tmp_at(-1, -1); /* close call */
490 }
491 if (!away)
492 pmon(md);
493 }
494
495 void
readmail(void)496 readmail(void)
497 {
498 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */
499 char *mr = 0;
500 more();
501 if (!(mr = getenv("MAILREADER")))
502 mr = DEF_MAILREADER;
503 if (child(1)) {
504 execl(mr, mr, (char *)NULL);
505 exit(1);
506 }
507 #else /* DEF_MAILREADER */
508 (void) page_file(mailbox, FALSE);
509 #endif /* DEF_MAILREADER */
510 /*
511 * get new stat; not entirely correct: there is a small time window
512 * where we do not see new mail
513 */
514 getmailstatus();
515 }
516 #endif /* MAIL */
517
518 /*
519 * normalize file name - we don't like ..'s or /'s
520 */
521 void
regularize(char * s)522 regularize(char *s)
523 {
524 char *lp;
525
526 while ((lp = strchr(s, '.')) || (lp = strchr(s, '/')))
527 *lp = '_';
528 }
529