1 /* $NetBSD: hack.unix.c,v 1.12 2009/06/07 20:13:18 dholland 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 1.12 2009/06/07 20:13:18 dholland 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(void) 101 { 102 (void) srandom((int) time((time_t *) 0)); 103 } 104 105 struct tm * 106 getlt(void) 107 { 108 time_t date; 109 110 (void) time(&date); 111 return (localtime(&date)); 112 } 113 114 int 115 getyear(void) 116 { 117 return (1900 + getlt()->tm_year); 118 } 119 120 char * 121 getdatestr(void) 122 { 123 static char datestr[7]; 124 struct tm *lt = getlt(); 125 126 (void) snprintf(datestr, sizeof(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(void) 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(void) 150 { 151 int hour = getlt()->tm_hour; 152 153 return (hour < 6 || hour > 21); 154 } 155 156 int 157 midnight(void) 158 { 159 return (getlt()->tm_hour == 0); 160 } 161 162 struct stat buf, hbuf; 163 164 void 165 gethdate(char *name) 166 { 167 #if 0 168 /* old version - for people short of space */ 169 170 char *np; 171 172 if(stat(name, &hbuf)) 173 error("Cannot get status of %s.", 174 (np = strrchr(name, '/')) ? np+1 : name); 175 #else 176 /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */ 177 178 179 /* 180 * The problem with #include <sys/param.h> is that this include file 181 * does not exist on all systems, and moreover, that it sometimes includes 182 * <sys/types.h> again, so that the compiler sees these typedefs twice. 183 */ 184 #define MAXPATHLEN 1024 185 186 const char *np, *path; 187 char filename[MAXPATHLEN + 1]; 188 if (strchr(name, '/') != NULL || (path = getenv("PATH")) == NULL) 189 path = ""; 190 191 for (;;) { 192 if ((np = strchr(path, ':')) == NULL) 193 np = path + strlen(path); /* point to end str */ 194 if (np - path <= 1) /* %% */ 195 (void) strcpy(filename, name); 196 else { 197 (void) strncpy(filename, path, np - path); 198 filename[np - path] = '/'; 199 (void) strcpy(filename + (np - path) + 1, name); 200 } 201 if (stat(filename, &hbuf) == 0) 202 return; 203 if (*np == '\0') 204 break; 205 path = np + 1; 206 } 207 error("Cannot get status of %s.", 208 (np = strrchr(name, '/')) ? np + 1 : name); 209 #endif 210 } 211 212 int 213 uptodate(int fd) 214 { 215 if (fstat(fd, &buf)) { 216 pline("Cannot get status of saved level? "); 217 return (0); 218 } 219 if (buf.st_mtime < hbuf.st_mtime) { 220 pline("Saved level is out of date. "); 221 return (0); 222 } 223 return (1); 224 } 225 226 /* see whether we should throw away this xlock file */ 227 int 228 veryold(int fd) 229 { 230 int i; 231 time_t date; 232 233 if (fstat(fd, &buf)) 234 return (0); /* cannot get status */ 235 if (buf.st_size != sizeof(int)) 236 return (0); /* not an xlock file */ 237 (void) time(&date); 238 if (date - buf.st_mtime < 3L * 24L * 60L * 60L) { /* recent */ 239 int lockedpid; /* should be the same size as 240 * hackpid */ 241 242 if (read(fd, (char *) &lockedpid, sizeof(lockedpid)) != 243 sizeof(lockedpid)) 244 /* strange ... */ 245 return (0); 246 247 /* 248 * From: Rick Adams <seismo!rick> This will work on 249 * 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing 250 * on V7 or 4.1bsd. 251 */ 252 if (!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 253 return (0); 254 } 255 (void) close(fd); 256 for (i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 257 glo(i); 258 (void) unlink(lock); 259 } 260 glo(0); 261 if (unlink(lock)) 262 return (0); /* cannot remove it */ 263 return (1); /* success! */ 264 } 265 266 void 267 getlock(void) 268 { 269 int i = 0, fd; 270 271 (void) fflush(stdout); 272 273 /* we ignore QUIT and INT at this point */ 274 if (link(HLOCK, LLOCK) == -1) { 275 int errnosv = errno; 276 277 perror(HLOCK); 278 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 279 switch (errnosv) { 280 case ENOENT: 281 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 282 break; 283 case EACCES: 284 printf("It seems you don't have write permission here.\n"); 285 break; 286 case EEXIST: 287 printf("(Try again or rm %s.)\n", LLOCK); 288 break; 289 default: 290 printf("I don't know what is wrong."); 291 } 292 getret(); 293 error("%s", ""); 294 /* NOTREACHED */ 295 } 296 regularize(lock); 297 glo(0); 298 if (locknum > 25) 299 locknum = 25; 300 301 do { 302 if (locknum) 303 lock[0] = 'a' + i++; 304 305 if ((fd = open(lock, O_RDONLY)) == -1) { 306 if (errno == ENOENT) 307 goto gotlock; /* no such file */ 308 perror(lock); 309 (void) unlink(LLOCK); 310 error("Cannot open %s", lock); 311 } 312 if (veryold(fd))/* if true, this closes fd and unlinks lock */ 313 goto gotlock; 314 (void) close(fd); 315 } while (i < locknum); 316 317 (void) unlink(LLOCK); 318 error(locknum ? "Too many hacks running now." 319 : "There is a game in progress under your name."); 320 gotlock: 321 fd = creat(lock, FMASK); 322 if (unlink(LLOCK) == -1) 323 error("Cannot unlink %s.", LLOCK); 324 if (fd == -1) { 325 error("cannot creat lock file."); 326 } else { 327 if (write(fd, (char *) &hackpid, sizeof(hackpid)) 328 != sizeof(hackpid)) { 329 error("cannot write lock"); 330 } 331 if (close(fd) == -1) { 332 error("cannot close lock"); 333 } 334 } 335 } 336 337 #ifdef MAIL 338 339 /* 340 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 341 * I don't know the details of his implementation.] 342 * { Later note: he disliked my calling a general mailreader and felt that 343 * hack should do the paging itself. But when I get mail, I want to put it 344 * in some folder, reply, etc. - it would be unreasonable to put all these 345 * functions in hack. } 346 * The mail daemon '2' is at present not a real monster, but only a visual 347 * effect. Thus, makemon() is superfluous. This might become otherwise, 348 * however. The motion of '2' is less restrained than usual: diagonal moves 349 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 350 * in a ROOM, even when you are Blind. 351 * Its path should be longer when you are Telepat-hic and Blind. 352 * 353 * Interesting side effects: 354 * - You can get rich by sending yourself a lot of mail and selling 355 * it to the shopkeeper. Unfortunately mail isn't very valuable. 356 * - You might die in case '2' comes along at a critical moment during 357 * a fight and delivers a scroll the weight of which causes you to 358 * collapse. 359 * 360 * Possible extensions: 361 * - Open the file MAIL and do fstat instead of stat for efficiency. 362 * (But sh uses stat, so this cannot be too bad.) 363 * - Examine the mail and produce a scroll of mail called "From somebody". 364 * - Invoke MAILREADER in such a way that only this single letter is read. 365 * 366 * - Make him lose his mail when a Nymph steals the letter. 367 * - Do something to the text when the scroll is enchanted or cancelled. 368 */ 369 #include "def.mkroom.h" 370 static struct stat omstat, nmstat; 371 static char *mailbox; 372 static long laststattime; 373 374 void 375 getmailstatus(void) 376 { 377 if (!(mailbox = getenv("MAIL"))) 378 return; 379 if (stat(mailbox, &omstat)) { 380 #ifdef PERMANENT_MAILBOX 381 pline("Cannot get status of MAIL=%s .", mailbox); 382 mailbox = 0; 383 #else 384 omstat.st_mtime = 0; 385 #endif /* PERMANENT_MAILBOX */ 386 } 387 } 388 389 void 390 ckmailstatus(void) 391 { 392 if (!mailbox 393 #ifdef MAILCKFREQ 394 || moves < laststattime + MAILCKFREQ 395 #endif /* MAILCKFREQ */ 396 ) 397 return; 398 laststattime = moves; 399 if (stat(mailbox, &nmstat)) { 400 #ifdef PERMANENT_MAILBOX 401 pline("Cannot get status of MAIL=%s anymore.", mailbox); 402 mailbox = 0; 403 #else 404 nmstat.st_mtime = 0; 405 #endif /* PERMANENT_MAILBOX */ 406 } else if (nmstat.st_mtime > omstat.st_mtime) { 407 if (nmstat.st_size) 408 newmail(); 409 getmailstatus();/* might be too late ... */ 410 } 411 } 412 413 void 414 newmail(void) 415 { 416 /* produce a scroll of mail */ 417 struct obj *obj; 418 struct monst *md; 419 420 obj = mksobj(SCR_MAIL); 421 if (md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 422 mdrush(md, 0); 423 424 pline("\"Hello, %s! I have some mail for you.\"", plname); 425 if (md) { 426 if (dist(md->mx, md->my) > 2) 427 pline("\"Catch!\""); 428 more(); 429 430 /* let him disappear again */ 431 mdrush(md, 1); 432 mondead(md); 433 } 434 obj = addinv(obj); 435 (void) identify(obj); /* set known and do prinv() */ 436 } 437 438 /* make md run through the cave */ 439 void 440 mdrush(struct monst *md, boolean away) 441 { 442 int uroom = inroom(u.ux, u.uy); 443 if (uroom >= 0) { 444 int tmp = rooms[uroom].fdoor; 445 int cnt = rooms[uroom].doorct; 446 int fx = u.ux, fy = u.uy; 447 while (cnt--) { 448 if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) { 449 fx = doors[tmp].x; 450 fy = doors[tmp].y; 451 } 452 tmp++; 453 } 454 tmp_at(-1, md->data->mlet); /* open call */ 455 if (away) { /* interchange origin and destination */ 456 unpmon(md); 457 tmp = fx; 458 fx = md->mx; 459 md->mx = tmp; 460 tmp = fy; 461 fy = md->my; 462 md->my = tmp; 463 } 464 while (fx != md->mx || fy != md->my) { 465 int dx, dy, nfx = fx, nfy = fy, d1, 466 d2; 467 468 tmp_at(fx, fy); 469 d1 = DIST(fx, fy, md->mx, md->my); 470 for (dx = -1; dx <= 1; dx++) 471 for (dy = -1; dy <= 1; dy++) 472 if (dx || dy) { 473 d2 = DIST(fx + dx, fy + dy, md->mx, md->my); 474 if (d2 < d1) { 475 d1 = d2; 476 nfx = fx + dx; 477 nfy = fy + dy; 478 } 479 } 480 if (nfx != fx || nfy != fy) { 481 fx = nfx; 482 fy = nfy; 483 } else { 484 if (!away) { 485 md->mx = fx; 486 md->my = fy; 487 } 488 break; 489 } 490 } 491 tmp_at(-1, -1); /* close call */ 492 } 493 if (!away) 494 pmon(md); 495 } 496 497 void 498 readmail(void) 499 { 500 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 501 char *mr = 0; 502 more(); 503 if (!(mr = getenv("MAILREADER"))) 504 mr = DEF_MAILREADER; 505 if (child(1)) { 506 execl(mr, mr, (char *) 0); 507 exit(1); 508 } 509 #else /* DEF_MAILREADER */ 510 (void) page_file(mailbox, FALSE); 511 #endif /* DEF_MAILREADER */ 512 /* 513 * get new stat; not entirely correct: there is a small time window 514 * where we do not see new mail 515 */ 516 getmailstatus(); 517 } 518 #endif /* MAIL */ 519 520 /* 521 * normalize file name - we don't like ..'s or /'s 522 */ 523 void 524 regularize(char *s) 525 { 526 char *lp; 527 528 while ((lp = strchr(s, '.')) || (lp = strchr(s, '/'))) 529 *lp = '_'; 530 } 531