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1.1 root 1: /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
2: /* hack.unix.c - version 1.0.3 */
3:
4: /* This file collects some Unix dependencies; hack.pager.c contains some more */
5:
6: /*
7: * The time is used for:
8: * - seed for random()
9: * - year on tombstone and yymmdd in record file
10: * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
11: * - night and midnight (the undead are dangerous at midnight)
12: * - determination of what files are "very old"
13: */
14:
15: #include <stdio.h>
16: #include <errno.h>
17: #include "hack.h" /* mainly for index() which depends on BSD */
18:
19: #include <sys/types.h> /* for time_t and stat */
20: #include <sys/stat.h>
21: #ifdef BSD
22: #include <sys/time.h>
23: #else
24: #include <time.h>
25: #endif BSD
26:
27: extern char *getenv();
28: extern time_t time();
29:
30: setrandom()
31: {
32: (void) srandom((int) time ((time_t *) 0));
33: }
34:
35: struct tm *
36: getlt()
37: {
38: time_t date;
39: struct tm *localtime();
40:
41: (void) time(&date);
42: return(localtime(&date));
43: }
44:
45: getyear()
46: {
47: return(1900 + getlt()->tm_year);
48: }
49:
50: char *
51: getdate()
52: {
53: static char datestr[7];
54: register struct tm *lt = getlt();
55:
56: (void) sprintf(datestr, "%2d%2d%2d",
57: lt->tm_year, lt->tm_mon + 1, lt->tm_mday);
58: if(datestr[2] == ' ') datestr[2] = '0';
59: if(datestr[4] == ' ') datestr[4] = '0';
60: return(datestr);
61: }
62:
63: phase_of_the_moon() /* 0-7, with 0: new, 4: full */
64: { /* moon period: 29.5306 days */
65: /* year: 365.2422 days */
66: register struct tm *lt = getlt();
67: register int epact, diy, golden;
68:
69: diy = lt->tm_yday;
70: golden = (lt->tm_year % 19) + 1;
71: epact = (11 * golden + 18) % 30;
72: if ((epact == 25 && golden > 11) || epact == 24)
73: epact++;
74:
75: return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 );
76: }
77:
78: night()
79: {
80: register int hour = getlt()->tm_hour;
81:
82: return(hour < 6 || hour > 21);
83: }
84:
85: midnight()
86: {
87: return(getlt()->tm_hour == 0);
88: }
89:
90: struct stat buf, hbuf;
91:
92: gethdate(name) char *name; {
93: /* old version - for people short of space */
94: /*
95: /* register char *np;
96: /* if(stat(name, &hbuf))
97: /* error("Cannot get status of %s.",
98: /* (np = rindex(name, '/')) ? np+1 : name);
99: /*
100: /* version using PATH from: [email protected] (Greg Couch) */
101:
102:
103: /*
104: * The problem with #include <sys/param.h> is that this include file
105: * does not exist on all systems, and moreover, that it sometimes includes
106: * <sys/types.h> again, so that the compiler sees these typedefs twice.
107: */
108: #define MAXPATHLEN 1024
109:
110: register char *np, *path;
111: char filename[MAXPATHLEN+1];
112: if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL)
113: path = "";
114:
115: for (;;) {
116: if ((np = index(path, ':')) == NULL)
117: np = path + strlen(path); /* point to end str */
118: if (np - path <= 1) /* %% */
119: (void) strcpy(filename, name);
120: else {
121: (void) strncpy(filename, path, np - path);
122: filename[np - path] = '/';
123: (void) strcpy(filename + (np - path) + 1, name);
124: }
125: if (stat(filename, &hbuf) == 0)
126: return;
127: if (*np == '\0')
128: break;
129: path = np + 1;
130: }
131: error("Cannot get status of %s.",
132: (np = rindex(name, '/')) ? np+1 : name);
133: }
134:
135: uptodate(fd) {
136: if(fstat(fd, &buf)) {
137: pline("Cannot get status of saved level? ");
138: return(0);
139: }
140: if(buf.st_mtime < hbuf.st_mtime) {
141: pline("Saved level is out of date. ");
142: return(0);
143: }
144: return(1);
145: }
146:
147: /* see whether we should throw away this xlock file */
148: veryold(fd) {
149: register int i;
150: time_t date;
151:
152: if(fstat(fd, &buf)) return(0); /* cannot get status */
153: if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */
154: (void) time(&date);
155: if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */
156: extern int errno;
157: int lockedpid; /* should be the same size as hackpid */
158:
159: if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=
160: sizeof(lockedpid))
161: /* strange ... */
162: return(0);
163:
164: /* From: Rick Adams <seismo!rick>
165: /* This will work on 4.1cbsd, 4.2bsd and system 3? & 5.
166: /* It will do nothing on V7 or 4.1bsd. */
167: if(!(kill(lockedpid, 0) == -1 && errno == ESRCH))
168: return(0);
169: }
170: (void) close(fd);
171: for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */
172: glo(i);
173: (void) unlink(lock);
174: }
175: glo(0);
176: if(unlink(lock)) return(0); /* cannot remove it */
177: return(1); /* success! */
178: }
179:
180: getlock()
181: {
182: extern int errno, hackpid, locknum;
183: register int i = 0, fd;
184:
185: (void) fflush(stdout);
186:
187: /* we ignore QUIT and INT at this point */
188: if (link(HLOCK, LLOCK) == -1) {
189: register int errnosv = errno;
190:
191: perror(HLOCK);
192: printf("Cannot link %s to %s\n", LLOCK, HLOCK);
193: switch(errnosv) {
194: case ENOENT:
195: printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
196: break;
197: case EACCES:
198: printf("It seems you don't have write permission here.\n");
199: break;
200: case EEXIST:
201: printf("(Try again or rm %s.)\n", LLOCK);
202: break;
203: default:
204: printf("I don't know what is wrong.");
205: }
206: getret();
207: error("");
208: /*NOTREACHED*/
209: }
210:
211: regularize(lock);
212: glo(0);
213: if(locknum > 25) locknum = 25;
214:
215: do {
216: if(locknum) lock[0] = 'a' + i++;
217:
218: if((fd = open(lock, 0)) == -1) {
219: if(errno == ENOENT) goto gotlock; /* no such file */
220: perror(lock);
221: (void) unlink(LLOCK);
222: error("Cannot open %s", lock);
223: }
224:
225: if(veryold(fd)) /* if true, this closes fd and unlinks lock */
226: goto gotlock;
227: (void) close(fd);
228: } while(i < locknum);
229:
230: (void) unlink(LLOCK);
231: error(locknum ? "Too many hacks running now."
232: : "There is a game in progress under your name.");
233: gotlock:
234: fd = creat(lock, FMASK);
235: if(unlink(LLOCK) == -1)
236: error("Cannot unlink %s.", LLOCK);
237: if(fd == -1) {
238: error("cannot creat lock file.");
239: } else {
240: if(write(fd, (char *) &hackpid, sizeof(hackpid))
241: != sizeof(hackpid)){
242: error("cannot write lock");
243: }
244: if(close(fd) == -1) {
245: error("cannot close lock");
246: }
247: }
248: }
249:
250: #ifdef MAIL
251:
252: /*
253: * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
254: * I don't know the details of his implementation.]
255: * { Later note: he disliked my calling a general mailreader and felt that
256: * hack should do the paging itself. But when I get mail, I want to put it
257: * in some folder, reply, etc. - it would be unreasonable to put all these
258: * functions in hack. }
259: * The mail daemon '2' is at present not a real monster, but only a visual
260: * effect. Thus, makemon() is superfluous. This might become otherwise,
261: * however. The motion of '2' is less restrained than usual: diagonal moves
262: * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
263: * in a ROOM, even when you are Blind.
264: * Its path should be longer when you are Telepat-hic and Blind.
265: *
266: * Interesting side effects:
267: * - You can get rich by sending yourself a lot of mail and selling
268: * it to the shopkeeper. Unfortunately mail isn't very valuable.
269: * - You might die in case '2' comes along at a critical moment during
270: * a fight and delivers a scroll the weight of which causes you to
271: * collapse.
272: *
273: * Possible extensions:
274: * - Open the file MAIL and do fstat instead of stat for efficiency.
275: * (But sh uses stat, so this cannot be too bad.)
276: * - Examine the mail and produce a scroll of mail called "From somebody".
277: * - Invoke MAILREADER in such a way that only this single letter is read.
278: *
279: * - Make him lose his mail when a Nymph steals the letter.
280: * - Do something to the text when the scroll is enchanted or cancelled.
281: */
282: #include "def.mkroom.h"
283: static struct stat omstat,nmstat;
284: static char *mailbox;
285: static long laststattime;
286:
287: getmailstatus() {
288: if(!(mailbox = getenv("MAIL")))
289: return;
290: if(stat(mailbox, &omstat)){
291: #ifdef PERMANENT_MAILBOX
292: pline("Cannot get status of MAIL=%s .", mailbox);
293: mailbox = 0;
294: #else
295: omstat.st_mtime = 0;
296: #endif PERMANENT_MAILBOX
297: }
298: }
299:
300: ckmailstatus() {
301: if(!mailbox
302: #ifdef MAILCKFREQ
303: || moves < laststattime + MAILCKFREQ
304: #endif MAILCKFREQ
305: )
306: return;
307: laststattime = moves;
308: if(stat(mailbox, &nmstat)){
309: #ifdef PERMANENT_MAILBOX
310: pline("Cannot get status of MAIL=%s anymore.", mailbox);
311: mailbox = 0;
312: #else
313: nmstat.st_mtime = 0;
314: #endif PERMANENT_MAILBOX
315: } else if(nmstat.st_mtime > omstat.st_mtime) {
316: if(nmstat.st_size)
317: newmail();
318: getmailstatus(); /* might be too late ... */
319: }
320: }
321:
322: newmail() {
323: /* produce a scroll of mail */
324: register struct obj *obj;
325: register struct monst *md;
326: extern char plname[];
327: extern struct obj *mksobj(), *addinv();
328: extern struct monst *makemon();
329: extern struct permonst pm_mail_daemon;
330:
331: obj = mksobj(SCR_MAIL);
332: if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */
333: mdrush(md,0);
334:
335: pline("\"Hello, %s! I have some mail for you.\"", plname);
336: if(md) {
337: if(dist(md->mx,md->my) > 2)
338: pline("\"Catch!\"");
339: more();
340:
341: /* let him disappear again */
342: mdrush(md,1);
343: mondead(md);
344: }
345:
346: obj = addinv(obj);
347: (void) identify(obj); /* set known and do prinv() */
348: }
349:
350: /* make md run through the cave */
351: mdrush(md,away)
352: register struct monst *md;
353: boolean away;
354: {
355: register int uroom = inroom(u.ux, u.uy);
356: if(uroom >= 0) {
357: register int tmp = rooms[uroom].fdoor;
358: register int cnt = rooms[uroom].doorct;
359: register int fx = u.ux, fy = u.uy;
360: while(cnt--) {
361: if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){
362: fx = doors[tmp].x;
363: fy = doors[tmp].y;
364: }
365: tmp++;
366: }
367: tmp_at(-1, md->data->mlet); /* open call */
368: if(away) { /* interchange origin and destination */
369: unpmon(md);
370: tmp = fx; fx = md->mx; md->mx = tmp;
371: tmp = fy; fy = md->my; md->my = tmp;
372: }
373: while(fx != md->mx || fy != md->my) {
374: register int dx,dy,nfx = fx,nfy = fy,d1,d2;
375:
376: tmp_at(fx,fy);
377: d1 = DIST(fx,fy,md->mx,md->my);
378: for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++)
379: if(dx || dy) {
380: d2 = DIST(fx+dx,fy+dy,md->mx,md->my);
381: if(d2 < d1) {
382: d1 = d2;
383: nfx = fx+dx;
384: nfy = fy+dy;
385: }
386: }
387: if(nfx != fx || nfy != fy) {
388: fx = nfx;
389: fy = nfy;
390: } else {
391: if(!away) {
392: md->mx = fx;
393: md->my = fy;
394: }
395: break;
396: }
397: }
398: tmp_at(-1,-1); /* close call */
399: }
400: if(!away)
401: pmon(md);
402: }
403:
404: readmail() {
405: #ifdef DEF_MAILREADER /* This implies that UNIX is defined */
406: register char *mr = 0;
407: more();
408: if(!(mr = getenv("MAILREADER")))
409: mr = DEF_MAILREADER;
410: if(child(1)){
411: execl(mr, mr, (char *) 0);
412: exit(1);
413: }
414: #else DEF_MAILREADER
415: (void) page_file(mailbox, FALSE);
416: #endif DEF_MAILREADER
417: /* get new stat; not entirely correct: there is a small time
418: window where we do not see new mail */
419: getmailstatus();
420: }
421: #endif MAIL
422:
423: regularize(s) /* normalize file name - we don't like ..'s or /'s */
424: register char *s;
425: {
426: register char *lp;
427:
428: while((lp = index(s, '.')) || (lp = index(s, '/')))
429: *lp = '_';
430: }
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