1 /* $NetBSD: hack.unix.c,v 1.9 2003/04/02 18:36:41 jsm 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 #include <sys/cdefs.h> 65 #ifndef lint 66 __RCSID("$NetBSD: hack.unix.c,v 1.9 2003/04/02 18:36:41 jsm Exp $"); 67 #endif /* not lint */ 68 69 /* This file collects some Unix dependencies; hack.pager.c contains some more */ 70 71 /* 72 * The time is used for: 73 * - seed for random() 74 * - year on tombstone and yymmdd in record file 75 * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON) 76 * - night and midnight (the undead are dangerous at midnight) 77 * - determination of what files are "very old" 78 */ 79 80 #include <errno.h> 81 #include <sys/types.h> /* for time_t and stat */ 82 #include <sys/stat.h> 83 #ifdef BSD 84 #include <sys/time.h> 85 #else 86 #include <time.h> 87 #endif /* BSD */ 88 #include <stdlib.h> 89 #include <unistd.h> 90 #include <signal.h> 91 #include <fcntl.h> 92 93 #include "hack.h" /* mainly for strchr() which depends on BSD */ 94 #include "extern.h" 95 96 extern int locknum; 97 98 99 void 100 setrandom() 101 { 102 (void) srandom((int) time((time_t *) 0)); 103 } 104 105 struct tm * 106 getlt() 107 { 108 time_t date; 109 110 (void) time(&date); 111 return (localtime(&date)); 112 } 113 114 int 115 getyear() 116 { 117 return (1900 + getlt()->tm_year); 118 } 119 120 char * 121 getdate() 122 { 123 static char datestr[7]; 124 struct tm *lt = getlt(); 125 126 (void) sprintf(datestr, "%02d%02d%02d", 127 lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday); 128 return (datestr); 129 } 130 131 int 132 phase_of_the_moon() 133 { /* 0-7, with 0: new, 4: full *//* moon 134 * period: 29.5306 days */ 135 /* year: 365.2422 days */ 136 struct tm *lt = getlt(); 137 int epact, diy, golden; 138 139 diy = lt->tm_yday; 140 golden = (lt->tm_year % 19) + 1; 141 epact = (11 * golden + 18) % 30; 142 if ((epact == 25 && golden > 11) || epact == 24) 143 epact++; 144 145 return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7); 146 } 147 148 int 149 night() 150 { 151 int hour = getlt()->tm_hour; 152 153 return (hour < 6 || hour > 21); 154 } 155 156 int 157 midnight() 158 { 159 return (getlt()->tm_hour == 0); 160 } 161 162 struct stat buf, hbuf; 163 164 void 165 gethdate(name) 166 char *name; 167 { 168 #if 0 169 /* old version - for people short of space */ 170 171 char *np; 172 173 if(stat(name, &hbuf)) 174 error("Cannot get status of %s.", 175 (np = strrchr(name, '/')) ? np+1 : name); 176 #else 177 /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */ 178 179 180 /* 181 * The problem with #include <sys/param.h> is that this include file 182 * does not exist on all systems, and moreover, that it sometimes includes 183 * <sys/types.h> again, so that the compiler sees these typedefs twice. 184 */ 185 #define MAXPATHLEN 1024 186 187 const char *np, *path; 188 char filename[MAXPATHLEN + 1]; 189 if (strchr(name, '/') != NULL || (path = getenv("PATH")) == NULL) 190 path = ""; 191 192 for (;;) { 193 if ((np = strchr(path, ':')) == NULL) 194 np = path + strlen(path); /* point to end str */ 195 if (np - path <= 1) /* %% */ 196 (void) strcpy(filename, name); 197 else { 198 (void) strncpy(filename, path, np - path); 199 filename[np - path] = '/'; 200 (void) strcpy(filename + (np - path) + 1, name); 201 } 202 if (stat(filename, &hbuf) == 0) 203 return; 204 if (*np == '\0') 205 break; 206 path = np + 1; 207 } 208 error("Cannot get status of %s.", 209 (np = strrchr(name, '/')) ? np + 1 : name); 210 #endif 211 } 212 213 int 214 uptodate(int fd) 215 { 216 if (fstat(fd, &buf)) { 217 pline("Cannot get status of saved level? "); 218 return (0); 219 } 220 if (buf.st_mtime < hbuf.st_mtime) { 221 pline("Saved level is out of date. "); 222 return (0); 223 } 224 return (1); 225 } 226 227 /* see whether we should throw away this xlock file */ 228 int 229 veryold(fd) 230 int fd; 231 { 232 int i; 233 time_t date; 234 235 if (fstat(fd, &buf)) 236 return (0); /* cannot get status */ 237 if (buf.st_size != sizeof(int)) 238 return (0); /* not an xlock file */ 239 (void) time(&date); 240 if (date - buf.st_mtime < 3L * 24L * 60L * 60L) { /* recent */ 241 int lockedpid; /* should be the same size as 242 * hackpid */ 243 244 if (read(fd, (char *) &lockedpid, sizeof(lockedpid)) != 245 sizeof(lockedpid)) 246 /* strange ... */ 247 return (0); 248 249 /* 250 * From: Rick Adams <seismo!rick> This will work on 251 * 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing 252 * on V7 or 4.1bsd. 253 */ 254 if (!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 255 return (0); 256 } 257 (void) close(fd); 258 for (i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 259 glo(i); 260 (void) unlink(lock); 261 } 262 glo(0); 263 if (unlink(lock)) 264 return (0); /* cannot remove it */ 265 return (1); /* success! */ 266 } 267 268 void 269 getlock() 270 { 271 int i = 0, fd; 272 273 (void) fflush(stdout); 274 275 /* we ignore QUIT and INT at this point */ 276 if (link(HLOCK, LLOCK) == -1) { 277 int errnosv = errno; 278 279 perror(HLOCK); 280 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 281 switch (errnosv) { 282 case ENOENT: 283 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 284 break; 285 case EACCES: 286 printf("It seems you don't have write permission here.\n"); 287 break; 288 case EEXIST: 289 printf("(Try again or rm %s.)\n", LLOCK); 290 break; 291 default: 292 printf("I don't know what is wrong."); 293 } 294 getret(); 295 error("%s", ""); 296 /* NOTREACHED */ 297 } 298 regularize(lock); 299 glo(0); 300 if (locknum > 25) 301 locknum = 25; 302 303 do { 304 if (locknum) 305 lock[0] = 'a' + i++; 306 307 if ((fd = open(lock, O_RDONLY)) == -1) { 308 if (errno == ENOENT) 309 goto gotlock; /* no such file */ 310 perror(lock); 311 (void) unlink(LLOCK); 312 error("Cannot open %s", lock); 313 } 314 if (veryold(fd))/* if true, this closes fd and unlinks lock */ 315 goto gotlock; 316 (void) close(fd); 317 } while (i < locknum); 318 319 (void) unlink(LLOCK); 320 error(locknum ? "Too many hacks running now." 321 : "There is a game in progress under your name."); 322 gotlock: 323 fd = creat(lock, FMASK); 324 if (unlink(LLOCK) == -1) 325 error("Cannot unlink %s.", LLOCK); 326 if (fd == -1) { 327 error("cannot creat lock file."); 328 } else { 329 if (write(fd, (char *) &hackpid, sizeof(hackpid)) 330 != sizeof(hackpid)) { 331 error("cannot write lock"); 332 } 333 if (close(fd) == -1) { 334 error("cannot close lock"); 335 } 336 } 337 } 338 339 #ifdef MAIL 340 341 /* 342 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 343 * I don't know the details of his implementation.] 344 * { Later note: he disliked my calling a general mailreader and felt that 345 * hack should do the paging itself. But when I get mail, I want to put it 346 * in some folder, reply, etc. - it would be unreasonable to put all these 347 * functions in hack. } 348 * The mail daemon '2' is at present not a real monster, but only a visual 349 * effect. Thus, makemon() is superfluous. This might become otherwise, 350 * however. The motion of '2' is less restrained than usual: diagonal moves 351 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 352 * in a ROOM, even when you are Blind. 353 * Its path should be longer when you are Telepat-hic and Blind. 354 * 355 * Interesting side effects: 356 * - You can get rich by sending yourself a lot of mail and selling 357 * it to the shopkeeper. Unfortunately mail isn't very valuable. 358 * - You might die in case '2' comes along at a critical moment during 359 * a fight and delivers a scroll the weight of which causes you to 360 * collapse. 361 * 362 * Possible extensions: 363 * - Open the file MAIL and do fstat instead of stat for efficiency. 364 * (But sh uses stat, so this cannot be too bad.) 365 * - Examine the mail and produce a scroll of mail called "From somebody". 366 * - Invoke MAILREADER in such a way that only this single letter is read. 367 * 368 * - Make him lose his mail when a Nymph steals the letter. 369 * - Do something to the text when the scroll is enchanted or cancelled. 370 */ 371 #include "def.mkroom.h" 372 static struct stat omstat, nmstat; 373 static char *mailbox; 374 static long laststattime; 375 376 void 377 getmailstatus() 378 { 379 if (!(mailbox = getenv("MAIL"))) 380 return; 381 if (stat(mailbox, &omstat)) { 382 #ifdef PERMANENT_MAILBOX 383 pline("Cannot get status of MAIL=%s .", mailbox); 384 mailbox = 0; 385 #else 386 omstat.st_mtime = 0; 387 #endif /* PERMANENT_MAILBOX */ 388 } 389 } 390 391 void 392 ckmailstatus() 393 { 394 if (!mailbox 395 #ifdef MAILCKFREQ 396 || moves < laststattime + MAILCKFREQ 397 #endif /* MAILCKFREQ */ 398 ) 399 return; 400 laststattime = moves; 401 if (stat(mailbox, &nmstat)) { 402 #ifdef PERMANENT_MAILBOX 403 pline("Cannot get status of MAIL=%s anymore.", mailbox); 404 mailbox = 0; 405 #else 406 nmstat.st_mtime = 0; 407 #endif /* PERMANENT_MAILBOX */ 408 } else if (nmstat.st_mtime > omstat.st_mtime) { 409 if (nmstat.st_size) 410 newmail(); 411 getmailstatus();/* might be too late ... */ 412 } 413 } 414 415 void 416 newmail() 417 { 418 /* produce a scroll of mail */ 419 struct obj *obj; 420 struct monst *md; 421 422 obj = mksobj(SCR_MAIL); 423 if (md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 424 mdrush(md, 0); 425 426 pline("\"Hello, %s! I have some mail for you.\"", plname); 427 if (md) { 428 if (dist(md->mx, md->my) > 2) 429 pline("\"Catch!\""); 430 more(); 431 432 /* let him disappear again */ 433 mdrush(md, 1); 434 mondead(md); 435 } 436 obj = addinv(obj); 437 (void) identify(obj); /* set known and do prinv() */ 438 } 439 440 /* make md run through the cave */ 441 void 442 mdrush(md, away) 443 struct monst *md; 444 boolean away; 445 { 446 int uroom = inroom(u.ux, u.uy); 447 if (uroom >= 0) { 448 int tmp = rooms[uroom].fdoor; 449 int cnt = rooms[uroom].doorct; 450 int fx = u.ux, fy = u.uy; 451 while (cnt--) { 452 if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) { 453 fx = doors[tmp].x; 454 fy = doors[tmp].y; 455 } 456 tmp++; 457 } 458 tmp_at(-1, md->data->mlet); /* open call */ 459 if (away) { /* interchange origin and destination */ 460 unpmon(md); 461 tmp = fx; 462 fx = md->mx; 463 md->mx = tmp; 464 tmp = fy; 465 fy = md->my; 466 md->my = tmp; 467 } 468 while (fx != md->mx || fy != md->my) { 469 int dx, dy, nfx = fx, nfy = fy, d1, 470 d2; 471 472 tmp_at(fx, fy); 473 d1 = DIST(fx, fy, md->mx, md->my); 474 for (dx = -1; dx <= 1; dx++) 475 for (dy = -1; dy <= 1; dy++) 476 if (dx || dy) { 477 d2 = DIST(fx + dx, fy + dy, md->mx, md->my); 478 if (d2 < d1) { 479 d1 = d2; 480 nfx = fx + dx; 481 nfy = fy + dy; 482 } 483 } 484 if (nfx != fx || nfy != fy) { 485 fx = nfx; 486 fy = nfy; 487 } else { 488 if (!away) { 489 md->mx = fx; 490 md->my = fy; 491 } 492 break; 493 } 494 } 495 tmp_at(-1, -1); /* close call */ 496 } 497 if (!away) 498 pmon(md); 499 } 500 501 void 502 readmail() 503 { 504 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 505 char *mr = 0; 506 more(); 507 if (!(mr = getenv("MAILREADER"))) 508 mr = DEF_MAILREADER; 509 if (child(1)) { 510 execl(mr, mr, (char *) 0); 511 exit(1); 512 } 513 #else /* DEF_MAILREADER */ 514 (void) page_file(mailbox, FALSE); 515 #endif /* DEF_MAILREADER */ 516 /* 517 * get new stat; not entirely correct: there is a small time window 518 * where we do not see new mail 519 */ 520 getmailstatus(); 521 } 522 #endif /* MAIL */ 523 524 void 525 regularize(s) /* normalize file name - we don't like ..'s 526 * or /'s */ 527 char *s; 528 { 529 char *lp; 530 531 while ((lp = strchr(s, '.')) || (lp = strchr(s, '/'))) 532 *lp = '_'; 533 } 534