1 /* $NetBSD: hack.unix.c,v 1.8 2001/03/25 20:44:03 jsm Exp $ */ 2 3 /* 4 * Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. 5 */ 6 7 #include <sys/cdefs.h> 8 #ifndef lint 9 __RCSID("$NetBSD: hack.unix.c,v 1.8 2001/03/25 20:44:03 jsm Exp $"); 10 #endif /* not lint */ 11 12 /* This file collects some Unix dependencies; hack.pager.c contains some more */ 13 14 /* 15 * The time is used for: 16 * - seed for random() 17 * - year on tombstone and yymmdd in record file 18 * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON) 19 * - night and midnight (the undead are dangerous at midnight) 20 * - determination of what files are "very old" 21 */ 22 23 #include <errno.h> 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 #include <stdlib.h> 32 #include <unistd.h> 33 #include <signal.h> 34 #include <fcntl.h> 35 36 #include "hack.h" /* mainly for strchr() which depends on BSD */ 37 #include "extern.h" 38 39 extern int locknum; 40 41 42 void 43 setrandom() 44 { 45 (void) srandom((int) time((time_t *) 0)); 46 } 47 48 struct tm * 49 getlt() 50 { 51 time_t date; 52 53 (void) time(&date); 54 return (localtime(&date)); 55 } 56 57 int 58 getyear() 59 { 60 return (1900 + getlt()->tm_year); 61 } 62 63 char * 64 getdate() 65 { 66 static char datestr[7]; 67 struct tm *lt = getlt(); 68 69 (void) sprintf(datestr, "%02d%02d%02d", 70 lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday); 71 return (datestr); 72 } 73 74 int 75 phase_of_the_moon() 76 { /* 0-7, with 0: new, 4: full *//* moon 77 * period: 29.5306 days */ 78 /* year: 365.2422 days */ 79 struct tm *lt = getlt(); 80 int epact, diy, golden; 81 82 diy = lt->tm_yday; 83 golden = (lt->tm_year % 19) + 1; 84 epact = (11 * golden + 18) % 30; 85 if ((epact == 25 && golden > 11) || epact == 24) 86 epact++; 87 88 return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7); 89 } 90 91 int 92 night() 93 { 94 int hour = getlt()->tm_hour; 95 96 return (hour < 6 || hour > 21); 97 } 98 99 int 100 midnight() 101 { 102 return (getlt()->tm_hour == 0); 103 } 104 105 struct stat buf, hbuf; 106 107 void 108 gethdate(name) 109 char *name; 110 { 111 #if 0 112 /* old version - for people short of space */ 113 114 char *np; 115 116 if(stat(name, &hbuf)) 117 error("Cannot get status of %s.", 118 (np = strrchr(name, '/')) ? np+1 : name); 119 #else 120 /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */ 121 122 123 /* 124 * The problem with #include <sys/param.h> is that this include file 125 * does not exist on all systems, and moreover, that it sometimes includes 126 * <sys/types.h> again, so that the compiler sees these typedefs twice. 127 */ 128 #define MAXPATHLEN 1024 129 130 const char *np, *path; 131 char filename[MAXPATHLEN + 1]; 132 if (strchr(name, '/') != NULL || (path = getenv("PATH")) == NULL) 133 path = ""; 134 135 for (;;) { 136 if ((np = strchr(path, ':')) == NULL) 137 np = path + strlen(path); /* point to end str */ 138 if (np - path <= 1) /* %% */ 139 (void) strcpy(filename, name); 140 else { 141 (void) strncpy(filename, path, np - path); 142 filename[np - path] = '/'; 143 (void) strcpy(filename + (np - path) + 1, name); 144 } 145 if (stat(filename, &hbuf) == 0) 146 return; 147 if (*np == '\0') 148 break; 149 path = np + 1; 150 } 151 error("Cannot get status of %s.", 152 (np = strrchr(name, '/')) ? np + 1 : name); 153 #endif 154 } 155 156 int 157 uptodate(int fd) 158 { 159 if (fstat(fd, &buf)) { 160 pline("Cannot get status of saved level? "); 161 return (0); 162 } 163 if (buf.st_mtime < hbuf.st_mtime) { 164 pline("Saved level is out of date. "); 165 return (0); 166 } 167 return (1); 168 } 169 170 /* see whether we should throw away this xlock file */ 171 int 172 veryold(fd) 173 int fd; 174 { 175 int i; 176 time_t date; 177 178 if (fstat(fd, &buf)) 179 return (0); /* cannot get status */ 180 if (buf.st_size != sizeof(int)) 181 return (0); /* not an xlock file */ 182 (void) time(&date); 183 if (date - buf.st_mtime < 3L * 24L * 60L * 60L) { /* recent */ 184 int lockedpid; /* should be the same size as 185 * hackpid */ 186 187 if (read(fd, (char *) &lockedpid, sizeof(lockedpid)) != 188 sizeof(lockedpid)) 189 /* strange ... */ 190 return (0); 191 192 /* 193 * From: Rick Adams <seismo!rick> This will work on 194 * 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing 195 * on V7 or 4.1bsd. 196 */ 197 if (!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 198 return (0); 199 } 200 (void) close(fd); 201 for (i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 202 glo(i); 203 (void) unlink(lock); 204 } 205 glo(0); 206 if (unlink(lock)) 207 return (0); /* cannot remove it */ 208 return (1); /* success! */ 209 } 210 211 void 212 getlock() 213 { 214 int i = 0, fd; 215 216 (void) fflush(stdout); 217 218 /* we ignore QUIT and INT at this point */ 219 if (link(HLOCK, LLOCK) == -1) { 220 int errnosv = errno; 221 222 perror(HLOCK); 223 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 224 switch (errnosv) { 225 case ENOENT: 226 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 227 break; 228 case EACCES: 229 printf("It seems you don't have write permission here.\n"); 230 break; 231 case EEXIST: 232 printf("(Try again or rm %s.)\n", LLOCK); 233 break; 234 default: 235 printf("I don't know what is wrong."); 236 } 237 getret(); 238 error("%s", ""); 239 /* NOTREACHED */ 240 } 241 regularize(lock); 242 glo(0); 243 if (locknum > 25) 244 locknum = 25; 245 246 do { 247 if (locknum) 248 lock[0] = 'a' + i++; 249 250 if ((fd = open(lock, O_RDONLY)) == -1) { 251 if (errno == ENOENT) 252 goto gotlock; /* no such file */ 253 perror(lock); 254 (void) unlink(LLOCK); 255 error("Cannot open %s", lock); 256 } 257 if (veryold(fd))/* if true, this closes fd and unlinks lock */ 258 goto gotlock; 259 (void) close(fd); 260 } while (i < locknum); 261 262 (void) unlink(LLOCK); 263 error(locknum ? "Too many hacks running now." 264 : "There is a game in progress under your name."); 265 gotlock: 266 fd = creat(lock, FMASK); 267 if (unlink(LLOCK) == -1) 268 error("Cannot unlink %s.", LLOCK); 269 if (fd == -1) { 270 error("cannot creat lock file."); 271 } else { 272 if (write(fd, (char *) &hackpid, sizeof(hackpid)) 273 != sizeof(hackpid)) { 274 error("cannot write lock"); 275 } 276 if (close(fd) == -1) { 277 error("cannot close lock"); 278 } 279 } 280 } 281 282 #ifdef MAIL 283 284 /* 285 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 286 * I don't know the details of his implementation.] 287 * { Later note: he disliked my calling a general mailreader and felt that 288 * hack should do the paging itself. But when I get mail, I want to put it 289 * in some folder, reply, etc. - it would be unreasonable to put all these 290 * functions in hack. } 291 * The mail daemon '2' is at present not a real monster, but only a visual 292 * effect. Thus, makemon() is superfluous. This might become otherwise, 293 * however. The motion of '2' is less restrained than usual: diagonal moves 294 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 295 * in a ROOM, even when you are Blind. 296 * Its path should be longer when you are Telepat-hic and Blind. 297 * 298 * Interesting side effects: 299 * - You can get rich by sending yourself a lot of mail and selling 300 * it to the shopkeeper. Unfortunately mail isn't very valuable. 301 * - You might die in case '2' comes along at a critical moment during 302 * a fight and delivers a scroll the weight of which causes you to 303 * collapse. 304 * 305 * Possible extensions: 306 * - Open the file MAIL and do fstat instead of stat for efficiency. 307 * (But sh uses stat, so this cannot be too bad.) 308 * - Examine the mail and produce a scroll of mail called "From somebody". 309 * - Invoke MAILREADER in such a way that only this single letter is read. 310 * 311 * - Make him lose his mail when a Nymph steals the letter. 312 * - Do something to the text when the scroll is enchanted or cancelled. 313 */ 314 #include "def.mkroom.h" 315 static struct stat omstat, nmstat; 316 static char *mailbox; 317 static long laststattime; 318 319 void 320 getmailstatus() 321 { 322 if (!(mailbox = getenv("MAIL"))) 323 return; 324 if (stat(mailbox, &omstat)) { 325 #ifdef PERMANENT_MAILBOX 326 pline("Cannot get status of MAIL=%s .", mailbox); 327 mailbox = 0; 328 #else 329 omstat.st_mtime = 0; 330 #endif /* PERMANENT_MAILBOX */ 331 } 332 } 333 334 void 335 ckmailstatus() 336 { 337 if (!mailbox 338 #ifdef MAILCKFREQ 339 || moves < laststattime + MAILCKFREQ 340 #endif /* MAILCKFREQ */ 341 ) 342 return; 343 laststattime = moves; 344 if (stat(mailbox, &nmstat)) { 345 #ifdef PERMANENT_MAILBOX 346 pline("Cannot get status of MAIL=%s anymore.", mailbox); 347 mailbox = 0; 348 #else 349 nmstat.st_mtime = 0; 350 #endif /* PERMANENT_MAILBOX */ 351 } else if (nmstat.st_mtime > omstat.st_mtime) { 352 if (nmstat.st_size) 353 newmail(); 354 getmailstatus();/* might be too late ... */ 355 } 356 } 357 358 void 359 newmail() 360 { 361 /* produce a scroll of mail */ 362 struct obj *obj; 363 struct monst *md; 364 365 obj = mksobj(SCR_MAIL); 366 if (md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 367 mdrush(md, 0); 368 369 pline("\"Hello, %s! I have some mail for you.\"", plname); 370 if (md) { 371 if (dist(md->mx, md->my) > 2) 372 pline("\"Catch!\""); 373 more(); 374 375 /* let him disappear again */ 376 mdrush(md, 1); 377 mondead(md); 378 } 379 obj = addinv(obj); 380 (void) identify(obj); /* set known and do prinv() */ 381 } 382 383 /* make md run through the cave */ 384 void 385 mdrush(md, away) 386 struct monst *md; 387 boolean away; 388 { 389 int uroom = inroom(u.ux, u.uy); 390 if (uroom >= 0) { 391 int tmp = rooms[uroom].fdoor; 392 int cnt = rooms[uroom].doorct; 393 int fx = u.ux, fy = u.uy; 394 while (cnt--) { 395 if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) { 396 fx = doors[tmp].x; 397 fy = doors[tmp].y; 398 } 399 tmp++; 400 } 401 tmp_at(-1, md->data->mlet); /* open call */ 402 if (away) { /* interchange origin and destination */ 403 unpmon(md); 404 tmp = fx; 405 fx = md->mx; 406 md->mx = tmp; 407 tmp = fy; 408 fy = md->my; 409 md->my = tmp; 410 } 411 while (fx != md->mx || fy != md->my) { 412 int dx, dy, nfx = fx, nfy = fy, d1, 413 d2; 414 415 tmp_at(fx, fy); 416 d1 = DIST(fx, fy, md->mx, md->my); 417 for (dx = -1; dx <= 1; dx++) 418 for (dy = -1; dy <= 1; dy++) 419 if (dx || dy) { 420 d2 = DIST(fx + dx, fy + dy, md->mx, md->my); 421 if (d2 < d1) { 422 d1 = d2; 423 nfx = fx + dx; 424 nfy = fy + dy; 425 } 426 } 427 if (nfx != fx || nfy != fy) { 428 fx = nfx; 429 fy = nfy; 430 } else { 431 if (!away) { 432 md->mx = fx; 433 md->my = fy; 434 } 435 break; 436 } 437 } 438 tmp_at(-1, -1); /* close call */ 439 } 440 if (!away) 441 pmon(md); 442 } 443 444 void 445 readmail() 446 { 447 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 448 char *mr = 0; 449 more(); 450 if (!(mr = getenv("MAILREADER"))) 451 mr = DEF_MAILREADER; 452 if (child(1)) { 453 execl(mr, mr, (char *) 0); 454 exit(1); 455 } 456 #else /* DEF_MAILREADER */ 457 (void) page_file(mailbox, FALSE); 458 #endif /* DEF_MAILREADER */ 459 /* 460 * get new stat; not entirely correct: there is a small time window 461 * where we do not see new mail 462 */ 463 getmailstatus(); 464 } 465 #endif /* MAIL */ 466 467 void 468 regularize(s) /* normalize file name - we don't like ..'s 469 * or /'s */ 470 char *s; 471 { 472 char *lp; 473 474 while ((lp = strchr(s, '.')) || (lp = strchr(s, '/'))) 475 *lp = '_'; 476 } 477