1 /* 2 * Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. 3 */ 4 5 #ifndef lint 6 static char rcsid[] = "$NetBSD: hack.unix.c,v 1.3 1995/03/23 08:31:55 cgd Exp $"; 7 #endif /* not lint */ 8 9 /* This file collects some Unix dependencies; hack.pager.c contains some more */ 10 11 /* 12 * The time is used for: 13 * - seed for random() 14 * - year on tombstone and yymmdd in record file 15 * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON) 16 * - night and midnight (the undead are dangerous at midnight) 17 * - determination of what files are "very old" 18 */ 19 20 #include <stdio.h> 21 #include <errno.h> 22 #include "hack.h" /* mainly for index() which depends on BSD */ 23 24 #include <sys/types.h> /* for time_t and stat */ 25 #include <sys/stat.h> 26 #ifdef BSD 27 #include <sys/time.h> 28 #else 29 #include <time.h> 30 #endif BSD 31 32 extern char *getenv(); 33 extern time_t time(); 34 35 setrandom() 36 { 37 (void) srandom((int) time ((time_t *) 0)); 38 } 39 40 struct tm * 41 getlt() 42 { 43 time_t date; 44 struct tm *localtime(); 45 46 (void) time(&date); 47 return(localtime(&date)); 48 } 49 50 getyear() 51 { 52 return(1900 + getlt()->tm_year); 53 } 54 55 char * 56 getdate() 57 { 58 static char datestr[7]; 59 register struct tm *lt = getlt(); 60 61 (void) sprintf(datestr, "%2d%2d%2d", 62 lt->tm_year, lt->tm_mon + 1, lt->tm_mday); 63 if(datestr[2] == ' ') datestr[2] = '0'; 64 if(datestr[4] == ' ') datestr[4] = '0'; 65 return(datestr); 66 } 67 68 phase_of_the_moon() /* 0-7, with 0: new, 4: full */ 69 { /* moon period: 29.5306 days */ 70 /* year: 365.2422 days */ 71 register struct tm *lt = getlt(); 72 register int epact, diy, golden; 73 74 diy = lt->tm_yday; 75 golden = (lt->tm_year % 19) + 1; 76 epact = (11 * golden + 18) % 30; 77 if ((epact == 25 && golden > 11) || epact == 24) 78 epact++; 79 80 return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 ); 81 } 82 83 night() 84 { 85 register int hour = getlt()->tm_hour; 86 87 return(hour < 6 || hour > 21); 88 } 89 90 midnight() 91 { 92 return(getlt()->tm_hour == 0); 93 } 94 95 struct stat buf, hbuf; 96 97 gethdate(name) char *name; { 98 /* old version - for people short of space */ 99 /* 100 /* register char *np; 101 /* if(stat(name, &hbuf)) 102 /* error("Cannot get status of %s.", 103 /* (np = rindex(name, '/')) ? np+1 : name); 104 /* 105 /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */ 106 107 108 /* 109 * The problem with #include <sys/param.h> is that this include file 110 * does not exist on all systems, and moreover, that it sometimes includes 111 * <sys/types.h> again, so that the compiler sees these typedefs twice. 112 */ 113 #define MAXPATHLEN 1024 114 115 register char *np, *path; 116 char filename[MAXPATHLEN+1]; 117 if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL) 118 path = ""; 119 120 for (;;) { 121 if ((np = index(path, ':')) == NULL) 122 np = path + strlen(path); /* point to end str */ 123 if (np - path <= 1) /* %% */ 124 (void) strcpy(filename, name); 125 else { 126 (void) strncpy(filename, path, np - path); 127 filename[np - path] = '/'; 128 (void) strcpy(filename + (np - path) + 1, name); 129 } 130 if (stat(filename, &hbuf) == 0) 131 return; 132 if (*np == '\0') 133 break; 134 path = np + 1; 135 } 136 error("Cannot get status of %s.", 137 (np = rindex(name, '/')) ? np+1 : name); 138 } 139 140 uptodate(fd) { 141 if(fstat(fd, &buf)) { 142 pline("Cannot get status of saved level? "); 143 return(0); 144 } 145 if(buf.st_mtime < hbuf.st_mtime) { 146 pline("Saved level is out of date. "); 147 return(0); 148 } 149 return(1); 150 } 151 152 /* see whether we should throw away this xlock file */ 153 veryold(fd) { 154 register int i; 155 time_t date; 156 157 if(fstat(fd, &buf)) return(0); /* cannot get status */ 158 if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */ 159 (void) time(&date); 160 if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */ 161 extern int errno; 162 int lockedpid; /* should be the same size as hackpid */ 163 164 if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) != 165 sizeof(lockedpid)) 166 /* strange ... */ 167 return(0); 168 169 /* From: Rick Adams <seismo!rick> 170 /* This will work on 4.1cbsd, 4.2bsd and system 3? & 5. 171 /* It will do nothing on V7 or 4.1bsd. */ 172 if(!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 173 return(0); 174 } 175 (void) close(fd); 176 for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 177 glo(i); 178 (void) unlink(lock); 179 } 180 glo(0); 181 if(unlink(lock)) return(0); /* cannot remove it */ 182 return(1); /* success! */ 183 } 184 185 getlock() 186 { 187 extern int errno, hackpid, locknum; 188 register int i = 0, fd; 189 190 (void) fflush(stdout); 191 192 /* we ignore QUIT and INT at this point */ 193 if (link(HLOCK, LLOCK) == -1) { 194 register int errnosv = errno; 195 196 perror(HLOCK); 197 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 198 switch(errnosv) { 199 case ENOENT: 200 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 201 break; 202 case EACCES: 203 printf("It seems you don't have write permission here.\n"); 204 break; 205 case EEXIST: 206 printf("(Try again or rm %s.)\n", LLOCK); 207 break; 208 default: 209 printf("I don't know what is wrong."); 210 } 211 getret(); 212 error(""); 213 /*NOTREACHED*/ 214 } 215 216 regularize(lock); 217 glo(0); 218 if(locknum > 25) locknum = 25; 219 220 do { 221 if(locknum) lock[0] = 'a' + i++; 222 223 if((fd = open(lock, 0)) == -1) { 224 if(errno == ENOENT) goto gotlock; /* no such file */ 225 perror(lock); 226 (void) unlink(LLOCK); 227 error("Cannot open %s", lock); 228 } 229 230 if(veryold(fd)) /* if true, this closes fd and unlinks lock */ 231 goto gotlock; 232 (void) close(fd); 233 } while(i < locknum); 234 235 (void) unlink(LLOCK); 236 error(locknum ? "Too many hacks running now." 237 : "There is a game in progress under your name."); 238 gotlock: 239 fd = creat(lock, FMASK); 240 if(unlink(LLOCK) == -1) 241 error("Cannot unlink %s.", LLOCK); 242 if(fd == -1) { 243 error("cannot creat lock file."); 244 } else { 245 if(write(fd, (char *) &hackpid, sizeof(hackpid)) 246 != sizeof(hackpid)){ 247 error("cannot write lock"); 248 } 249 if(close(fd) == -1) { 250 error("cannot close lock"); 251 } 252 } 253 } 254 255 #ifdef MAIL 256 257 /* 258 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 259 * I don't know the details of his implementation.] 260 * { Later note: he disliked my calling a general mailreader and felt that 261 * hack should do the paging itself. But when I get mail, I want to put it 262 * in some folder, reply, etc. - it would be unreasonable to put all these 263 * functions in hack. } 264 * The mail daemon '2' is at present not a real monster, but only a visual 265 * effect. Thus, makemon() is superfluous. This might become otherwise, 266 * however. The motion of '2' is less restrained than usual: diagonal moves 267 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 268 * in a ROOM, even when you are Blind. 269 * Its path should be longer when you are Telepat-hic and Blind. 270 * 271 * Interesting side effects: 272 * - You can get rich by sending yourself a lot of mail and selling 273 * it to the shopkeeper. Unfortunately mail isn't very valuable. 274 * - You might die in case '2' comes along at a critical moment during 275 * a fight and delivers a scroll the weight of which causes you to 276 * collapse. 277 * 278 * Possible extensions: 279 * - Open the file MAIL and do fstat instead of stat for efficiency. 280 * (But sh uses stat, so this cannot be too bad.) 281 * - Examine the mail and produce a scroll of mail called "From somebody". 282 * - Invoke MAILREADER in such a way that only this single letter is read. 283 * 284 * - Make him lose his mail when a Nymph steals the letter. 285 * - Do something to the text when the scroll is enchanted or cancelled. 286 */ 287 #include "def.mkroom.h" 288 static struct stat omstat,nmstat; 289 static char *mailbox; 290 static long laststattime; 291 292 getmailstatus() { 293 if(!(mailbox = getenv("MAIL"))) 294 return; 295 if(stat(mailbox, &omstat)){ 296 #ifdef PERMANENT_MAILBOX 297 pline("Cannot get status of MAIL=%s .", mailbox); 298 mailbox = 0; 299 #else 300 omstat.st_mtime = 0; 301 #endif PERMANENT_MAILBOX 302 } 303 } 304 305 ckmailstatus() { 306 if(!mailbox 307 #ifdef MAILCKFREQ 308 || moves < laststattime + MAILCKFREQ 309 #endif MAILCKFREQ 310 ) 311 return; 312 laststattime = moves; 313 if(stat(mailbox, &nmstat)){ 314 #ifdef PERMANENT_MAILBOX 315 pline("Cannot get status of MAIL=%s anymore.", mailbox); 316 mailbox = 0; 317 #else 318 nmstat.st_mtime = 0; 319 #endif PERMANENT_MAILBOX 320 } else if(nmstat.st_mtime > omstat.st_mtime) { 321 if(nmstat.st_size) 322 newmail(); 323 getmailstatus(); /* might be too late ... */ 324 } 325 } 326 327 newmail() { 328 /* produce a scroll of mail */ 329 register struct obj *obj; 330 register struct monst *md; 331 extern char plname[]; 332 extern struct obj *mksobj(), *addinv(); 333 extern struct monst *makemon(); 334 extern struct permonst pm_mail_daemon; 335 336 obj = mksobj(SCR_MAIL); 337 if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 338 mdrush(md,0); 339 340 pline("\"Hello, %s! I have some mail for you.\"", plname); 341 if(md) { 342 if(dist(md->mx,md->my) > 2) 343 pline("\"Catch!\""); 344 more(); 345 346 /* let him disappear again */ 347 mdrush(md,1); 348 mondead(md); 349 } 350 351 obj = addinv(obj); 352 (void) identify(obj); /* set known and do prinv() */ 353 } 354 355 /* make md run through the cave */ 356 mdrush(md,away) 357 register struct monst *md; 358 boolean away; 359 { 360 register int uroom = inroom(u.ux, u.uy); 361 if(uroom >= 0) { 362 register int tmp = rooms[uroom].fdoor; 363 register int cnt = rooms[uroom].doorct; 364 register int fx = u.ux, fy = u.uy; 365 while(cnt--) { 366 if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){ 367 fx = doors[tmp].x; 368 fy = doors[tmp].y; 369 } 370 tmp++; 371 } 372 tmp_at(-1, md->data->mlet); /* open call */ 373 if(away) { /* interchange origin and destination */ 374 unpmon(md); 375 tmp = fx; fx = md->mx; md->mx = tmp; 376 tmp = fy; fy = md->my; md->my = tmp; 377 } 378 while(fx != md->mx || fy != md->my) { 379 register int dx,dy,nfx = fx,nfy = fy,d1,d2; 380 381 tmp_at(fx,fy); 382 d1 = DIST(fx,fy,md->mx,md->my); 383 for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 384 if(dx || dy) { 385 d2 = DIST(fx+dx,fy+dy,md->mx,md->my); 386 if(d2 < d1) { 387 d1 = d2; 388 nfx = fx+dx; 389 nfy = fy+dy; 390 } 391 } 392 if(nfx != fx || nfy != fy) { 393 fx = nfx; 394 fy = nfy; 395 } else { 396 if(!away) { 397 md->mx = fx; 398 md->my = fy; 399 } 400 break; 401 } 402 } 403 tmp_at(-1,-1); /* close call */ 404 } 405 if(!away) 406 pmon(md); 407 } 408 409 readmail() { 410 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 411 register char *mr = 0; 412 more(); 413 if(!(mr = getenv("MAILREADER"))) 414 mr = DEF_MAILREADER; 415 if(child(1)){ 416 execl(mr, mr, (char *) 0); 417 exit(1); 418 } 419 #else DEF_MAILREADER 420 (void) page_file(mailbox, FALSE); 421 #endif DEF_MAILREADER 422 /* get new stat; not entirely correct: there is a small time 423 window where we do not see new mail */ 424 getmailstatus(); 425 } 426 #endif MAIL 427 428 regularize(s) /* normalize file name - we don't like ..'s or /'s */ 429 register char *s; 430 { 431 register char *lp; 432 433 while((lp = index(s, '.')) || (lp = index(s, '/'))) 434 *lp = '_'; 435 } 436