Source:NetHack 2.2a/unixunix.c

Below is the full text to unixunix.c from the source code of NetHack 2.2a. To link to a particular line, write [[NetHack 2.2a/unixunix.c#line123 ]], for example.

Warning! This is the source code from an old release. For the latest release, see Source code

1.   /*	SCCS Id: @(#)unixunix.c	1.4	87/08/08 2.   /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */ 3.    /* hack.unix.c - version 1.0.3 */ 4.    5.    /* This file collects some Unix dependencies; pager.c contains some more */ 6.    7.    /*  8.     * The time is used for: 9.    *	- seed for rand 10.   *	- year on tombstone and yymmdd in record file 11.   *	- phase of the moon (various monsters react to NEW_MOON or FULL_MOON) 12.   *	- night and midnight (the undead are dangerous at midnight) 13.   *	- determination of what files are "very old" 14.   */  15.    16.   #include   17. #include  18. #include "hack.h"	/* mainly for index which depends on BSD */ 19.   20.   #include			/* for time_t and stat */ 21.  #include	  22. #ifdef BSD 23.  #include	  24. #else 25.  #include	  26. #endif 27.   28.   extern char *getenv; 29.  extern time_t time; 30.   31.   setrandom 32.  {  33.   	(void) srand((int) time ((time_t *) 0)); 34.  }  35.    36.   struct tm * 37.  getlt 38.  {  39.   	time_t date; 40.  	struct tm *localtime; 41.   42.   	(void) time(&date); 43.  	return(localtime(&date)); 44.  }  45.    46.   getyear 47.  {  48.   	return(1900 + getlt->tm_year); 49.  }  50.    51.   char * 52.  getdate 53.  {  54.   	static char datestr[7]; 55.  	register struct tm *lt = getlt; 56.   57.   	(void) sprintf(datestr, "%2d%2d%2d",  58.   		lt->tm_year, lt->tm_mon + 1, lt->tm_mday); 59.  	if(datestr[2] == ' ') datestr[2] = '0'; 60.  	if(datestr[4] == ' ') datestr[4] = '0'; 61.  	return(datestr); 62.  }  63.    64.   phase_of_the_moon			/* 0-7, with 0: new, 4: full */ 65.  {					/* moon period: 29.5306 days */ 66.  					/* year: 365.2422 days */ 67.  	register struct tm *lt = getlt; 68.  	register 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.   night 80.  {  81.   	register int hour = getlt->tm_hour; 82.   83.   	return(hour < 6 || hour > 21); 84.  }  85.    86.   midnight 87.  {  88.   	return(getlt->tm_hour == 0); 89.  }  90.    91.   struct stat buf, hbuf; 92.   93.   gethdate(name) char *name; { 94.  /* old version - for people short of space */ 95.  /*  96.   /* register char *np; 97.  /*	if(stat(name, &hbuf)) 98.  /*		error("Cannot get status of %s.",  99.   /*			(np = rindex(name, '/')) ? np+1 : name); 100. /*  101.  /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */ 102.  103.   104.  /*  105.   * The problem with   #include	   is that this include file 106.  * does not exist on all systems, and moreover, that it sometimes includes 107.  *  again, so that the compiler sees these typedefs twice. 108.  */  109.  #define		MAXPATHLEN	1024 110.  111.  register char *np, *path; 112. char filename[MAXPATHLEN+1]; 113. 	if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL) 114. 		path = ""; 115.  116.  	for  { 117. 		if ((np = index(path, ':')) == NULL) 118. 			np = path + strlen(path);	/* point to end str */ 119. 		if (np - path <= 1)			/* %% */ 120. 			(void) strcpy(filename, name); 121. 		else { 122. 			(void) strncpy(filename, path, np - path); 123. 			filename[np - path] = '/'; 124. 			(void) strcpy(filename + (np - path) + 1, name); 125. 		}  126.  		if (stat(filename, &hbuf) == 0) 127. 			return; 128. 		if (*np == '\0') 129. 			break; 130. 		path = np + 1; 131. 	}  132.  	error("Cannot get status of %s.",  133.  		(np = rindex(name, '/')) ? np+1 : name); 134. }  135.   136.  uptodate(fd) { 137. 	if(fstat(fd, &buf)) { 138. 		pline("Cannot get status of saved level? "); 139. 		return(0); 140. 	}  141.  	if(buf.st_mtime < hbuf.st_mtime) { 142. 		pline("Saved level is out of date. "); 143. 		return(0); 144. 	}  145.  	return(1); 146. }  147.   148.  /* see whether we should throw away this xlock file */ 149. veryold(fd) { 150. 	register int i;  151. time_t date; 152.  153.  	if(fstat(fd, &buf)) return(0);			/* cannot get status */ 154. 	if(buf.st_size != sizeof(int)) return(0);	/* not an xlock file */ 155. 	(void) time(&date); 156. 	if(date - buf.st_mtime < 3L*24L*60L*60L) {	/* recent */ 157. 		extern int errno; 158. 		int lockedpid;	/* should be the same size as hackpid */ 159.  160.  		if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=  161.  			sizeof(lockedpid)) 162. 			/* strange ... */ 163.  			return(0); 164.  165.  		/* From: Rick Adams  166. 		/* This will work on 4.1cbsd, 4.2bsd and system 3? & 5. 167.  		/* It will do nothing on V7 or 4.1bsd. */ 168.  		if(!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 169. 			return(0); 170. 	}  171.  	(void) close(fd); 172. 	for(i = 1; i <= MAXLEVEL; i++) {		/* try to remove all */ 173. 		glo(i); 174. 		(void) unlink(lock); 175. 	}  176.  	glo(0); 177. 	if(unlink(lock)) return(0);			/* cannot remove it */ 178. 	return(1);					/* success! */ 179.  }  180.   181.  getlock 182. {  183.  	extern int errno, hackpid, locknum; 184. 	register int i = 0, fd; 185.  186.  	(void) fflush(stdout); 187.  188.  	/* we ignore QUIT and INT at this point */ 189. 	if (link(HLOCK, LLOCK) == -1) { 190. 		register int errnosv = errno; 191.  192.  		perror(HLOCK); 193. 		printf("Cannot link %s to %s\n", LLOCK, HLOCK); 194. 		switch(errnosv) { 195. 		case ENOENT: 196. 		    printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 197. 		    break; 198. 		case EACCES: 199. 		    printf("It seems you don't have write permission here.\n"); 200. 		    break; 201. 		case EEXIST: 202. 		    printf("(Try again or rm %s.)\n", LLOCK); 203. 		    break; 204. 		default: 205. 		    printf("I don't know what is wrong."); 206. 		}  207.  		getret; 208. 		error(""); 209. 		/*NOTREACHED*/ 210. 	}  211.   212.  	regularize(lock); 213. 	glo(0); 214. 	if(locknum > 25) locknum = 25; 215.  216.  	do { 217. 		if(locknum) lock[0] = 'a' + i++; 218.  219.  		if((fd = open(lock, 0)) == -1) { 220. 			if(errno == ENOENT) goto gotlock;    /* no such file */ 221. 			perror(lock); 222. 			(void) unlink(LLOCK); 223. 			error("Cannot open %s", lock); 224. 		}  225.   226.  		if(veryold(fd))	/* if true, this closes fd and unlinks lock */ 227. 			goto gotlock; 228. 		(void) close(fd); 229. 	} while(i < locknum); 230.  231.  	(void) unlink(LLOCK); 232. 	error(locknum ? "Too many hacks running now."  233.  		      : "There is a game in progress under your name."); 234. gotlock: 235. 	fd = creat(lock, FMASK); 236. 	if(unlink(LLOCK) == -1) 237. 		error("Cannot unlink %s.", LLOCK); 238. 	if(fd == -1) { 239. 		error("cannot creat lock file."); 240. 	} else { 241. 		if(write(fd, (char *) &hackpid, sizeof(hackpid))  242.  		    != sizeof(hackpid)){ 243. 			error("cannot write lock"); 244. 		}  245.  		if(close(fd) == -1) { 246. 			error("cannot close lock"); 247. 		}  248.  	}  249.  }	  250.   251.  #ifdef MAIL 252.  253.  /*  254.   * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 255.  * I don't know the details of his implementation.] 256.  * { Later note: he disliked my calling a general mailreader and felt that 257.  *   hack should do the paging itself. But when I get mail, I want to put it 258. *  in some folder, reply, etc. - it would be unreasonable to put all these 259.  *   functions in hack. } 260.   * The mail daemon '2' is at present not a real monster, but only a visual 261.  * effect. Thus, makemon is superfluous. This might become otherwise, 262.  * however. The motion of '2' is less restrained than usual: diagonal moves 263.  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 264.  * in a ROOM, even when you are Blind. 265.  * Its path should be longer when you are Telepat-hic and Blind. 266.  *  267.   * Interesting side effects: 268.  *	- You can get rich by sending yourself a lot of mail and selling 269.  *	  it to the shopkeeper. Unfortunately mail isn't very valuable. 270.  *	- You might die in case '2' comes along at a critical moment during 271.  *	  a fight and delivers a scroll the weight of which causes you to  272. *	 collapse. 273.  *  274.   * Possible extensions: 275.  *	- Open the file MAIL and do fstat instead of stat for efficiency. 276.  *	  (But sh uses stat, so this cannot be too bad.) 277.  *	- Examine the mail and produce a scroll of mail called "From somebody". 278.  *	- Invoke MAILREADER in such a way that only this single letter is read. 279.  *  280.   *	- Make him lose his mail when a Nymph steals the letter. 281.  *	- Do something to the text when the scroll is enchanted or cancelled. 282.  */  283.  #include	"mkroom.h"  284. static struct stat omstat,nmstat; 285. static char *mailbox; 286. static long laststattime; 287.  288.  getmailstatus { 289. 	if(!(mailbox = getenv("MAIL"))) 290. 		return; 291. 	if(stat(mailbox, &omstat)){ 292. #ifdef PERMANENT_MAILBOX 293. 		pline("Cannot get status of MAIL=%s .", mailbox); 294. 		mailbox = 0; 295. #else 296. 		omstat.st_mtime = 0; 297. #endif 298. 	}  299.  }  300.   301.  ckmailstatus { 302. 	if(!mailbox  303.  #ifdef MAILCKFREQ  304.  		    || moves < laststattime + MAILCKFREQ  305.  #endif  306.  							) 307. 		return; 308. 	laststattime = moves; 309. 	if(stat(mailbox, &nmstat)){ 310. #ifdef PERMANENT_MAILBOX 311. 		pline("Cannot get status of MAIL=%s anymore.", mailbox); 312. 		mailbox = 0; 313. #else 314. 		nmstat.st_mtime = 0; 315. #endif 316. 	} else if(nmstat.st_mtime > omstat.st_mtime) { 317. 		if(nmstat.st_size) 318. 			newmail; 319. 		getmailstatus;	/* might be too late ... */ 320.  	}  321.  }  322.   323.  newmail { 324. 	/* produce a scroll of mail */ 325. 	register struct obj *obj; 326. 	register struct monst *md; 327. 	extern char plname[]; 328. 	extern struct obj *mksobj, *addinv; 329. 	extern struct monst *makemon; 330. 	extern struct permonst pm_mail_daemon; 331.  332.  	obj = mksobj(SCR_MAIL); 333. 	if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 334. 		mdrush(md,0); 335.  336.  	pline("\"Hello, %s! I have some mail for you.\"", plname); 337. 	if(md) { 338. 		if(dist(md->mx,md->my) > 2) 339. 			pline("\"Catch!\""); 340. 		more; 341.  342.  		/* let him disappear again */ 343. 		mdrush(md,1); 344. 		mondead(md); 345. 	}  346.   347.  	obj = addinv(obj); 348. 	(void) identify(obj);		/* set known and do prinv */ 349. }  350.   351.  /* make md run through the cave */ 352. mdrush(md,away) 353. register struct monst *md; 354. boolean away; 355. {  356.  	register int uroom = inroom(u.ux, u.uy); 357. 	if(uroom >= 0) { 358. 		register int tmp = rooms[uroom].fdoor; 359. 		register int cnt = rooms[uroom].doorct; 360. 		register int fx = u.ux, fy = u.uy; 361. 		while(cnt--) { 362. 			if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){ 363. 				fx = doors[tmp].x;  364. fy = doors[tmp].y; 365. } 366.  			tmp++; 367. 		}  368.  		tmp_at(-1, md->data->mlet);	/* open call */ 369. 		if(away) {	/* interchange origin and destination */ 370. 			unpmon(md); 371. 			tmp = fx; fx = md->mx; md->mx = tmp; 372. 			tmp = fy; fy = md->my; md->my = tmp; 373. 		}  374.  		while(fx != md->mx || fy != md->my) { 375. 			register int dx,dy,nfx = fx,nfy = fy,d1,d2; 376.  377.  			tmp_at(fx,fy); 378. 			d1 = DIST(fx,fy,md->mx,md->my); 379. 			for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 380. 			    if(dx || dy) { 381. 				d2 = DIST(fx+dx,fy+dy,md->mx,md->my); 382. 				if(d2 < d1) { 383. 				    d1 = d2; 384. 				    nfx = fx+dx; 385. 				    nfy = fy+dy; 386. 				}  387.  			    }  388.  			if(nfx != fx || nfy != fy) { 389. 			    fx = nfx; 390. 			    fy = nfy; 391. 			} else { 392. 			    if(!away) { 393. 				md->mx = fx; 394. 				md->my = fy; 395. 			    }  396.  			    break; 397. 			}  398.  		}  399.  		tmp_at(-1,-1);			/* close call */ 400. 	}  401.  	if(!away) 402. 		pmon(md); 403. }  404.   405.  readmail { 406. #ifdef DEF_MAILREADER			/* This implies that UNIX is defined */ 407. 	register char *mr = 0; 408. 	more; 409. 	if(!(mr = getenv("MAILREADER"))) 410. 		mr = DEF_MAILREADER; 411. 	if(child(1)){ 412. 		execl(mr, mr, (char *) 0); 413. 		exit(1); 414. 	}  415.  #else 416. 	(void) page_file(mailbox, FALSE); 417. #endif 418. 	/* get new stat; not entirely correct: there is a small time 419. 	   window where we do not see new mail */ 420. 	getmailstatus; 421. }  422.  #endif /* MAIL /**/ 423.  424.  regularize(s)	/* normalize file name - we don't like ..'s or /'s */ 425. register char *s; 426. {  427.  	register char *lp; 428.  429.  	while((lp = index(s, '.')) || (lp = index(s, '/'))) 430. 		*lp = '_'; 431. }