1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */ 2 /* hack.unix.c - version 1.0.3 */ 3 /* $FreeBSD: src/games/hack/hack.unix.c,v 1.8 1999/11/16 02:57:13 billf Exp $ */ 4 5 /* This file collects some Unix dependencies; hack.pager.c contains some more */ 6 7 /* 8 * The time is used for: 9 * - seed for random() 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 <errno.h> 17 #include "hack.h" 18 19 #include <sys/types.h> /* for time_t and stat */ 20 #include <sys/stat.h> 21 #include <time.h> 22 23 static struct tm *getlt(void); 24 static bool veryold(int); 25 #ifdef MAIL 26 static void newmail(void); 27 static void mdrush(struct monst *, bool); 28 #endif 29 30 void 31 setrandom(void) 32 { 33 srandomdev(); 34 } 35 36 static struct tm * 37 getlt(void) 38 { 39 time_t date; 40 41 time(&date); 42 return (localtime(&date)); 43 } 44 45 int 46 getyear(void) 47 { 48 return (1900 + getlt()->tm_year); 49 } 50 51 char * 52 getdate(void) 53 { 54 static char datestr[7]; 55 struct tm *lt = getlt(); 56 57 snprintf(datestr, sizeof(datestr), "%02d%02d%02d", 58 lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday); 59 return (datestr); 60 } 61 62 int 63 phase_of_the_moon(void) /* 0-7, with 0: new, 4: full */ 64 { /* moon period: 29.5306 days */ 65 /* year: 365.2422 days */ 66 struct tm *lt = getlt(); 67 int epact, diy, golden; 68 69 diy = lt->tm_yday; 70 golden = (lt->tm_year % 19) + 1; 71 epact = (11 * golden + 18) % 30; 72 if ((epact == 25 && golden > 11) || epact == 24) 73 epact++; 74 75 return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7); 76 } 77 78 bool 79 night(void) 80 { 81 int hour = getlt()->tm_hour; 82 83 return (hour < 6 || hour > 21); 84 } 85 86 bool 87 midnight(void) 88 { 89 return (getlt()->tm_hour == 0); 90 } 91 92 struct stat buf, hbuf; 93 94 void 95 gethdate(const char *name) 96 { 97 /* old version - for people short of space */ 98 char *np; 99 100 name = "/usr/games/hide/hack"; 101 if (stat(name, &hbuf)) 102 error("Cannot get status of %s.", 103 (np = strrchr(name, '/')) ? np + 1 : name); 104 } 105 106 bool 107 uptodate(int fd) 108 { 109 if (fstat(fd, &buf)) { 110 pline("Cannot get status of saved level? "); 111 return (0); 112 } 113 if (buf.st_mtime < hbuf.st_mtime) { 114 pline("Saved level is out of date. "); 115 return (0); 116 } 117 return (1); 118 } 119 120 /* see whether we should throw away this xlock file */ 121 static bool 122 veryold(int fd) 123 { 124 int i; 125 time_t date; 126 127 if (fstat(fd, &buf)) /* cannot get status */ 128 return (0); 129 if (buf.st_size != sizeof(int)) /* not an xlock file */ 130 return (0); 131 time(&date); 132 if (date - buf.st_mtime < 3L * 24L * 60L * 60L) { /* recent */ 133 int lockedpid; /* should be the same size as hackpid */ 134 135 if (read(fd, (char *)&lockedpid, sizeof(lockedpid)) != 136 sizeof(lockedpid)) 137 /* strange ... */ 138 return (0); 139 140 /* From: Rick Adams <seismo!rick> */ 141 /* This will work on 4.1cbsd, 4.2bsd and system 3? & 5. */ 142 /* It will do nothing on V7 or 4.1bsd. */ 143 if (!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 144 return (0); 145 } 146 close(fd); 147 for (i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 148 glo(i); 149 unlink(lock); 150 } 151 glo(0); 152 if (unlink(lock)) /* cannot remove it */ 153 return (0); 154 return (1); /* success! */ 155 } 156 157 void 158 getlock(void) 159 { 160 int i = 0, fd; 161 162 fflush(stdout); 163 164 /* we ignore QUIT and INT at this point */ 165 if ((link(HLOCK, LLOCK) == -1) && (symlink(HLOCK, LLOCK) == -1)) { 166 int errnosv = errno; 167 168 perror(HLOCK); 169 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 170 switch (errnosv) { 171 case ENOENT: 172 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 173 break; 174 case EACCES: 175 printf("It seems you don't have write permission here.\n"); 176 break; 177 case EEXIST: 178 printf("(Try again or rm %s.)\n", LLOCK); 179 break; 180 default: 181 printf("I don't know what is wrong."); 182 } 183 getret(); 184 error("%s", ""); 185 /* NOTREACHED */ 186 } 187 188 regularize(lock); 189 glo(0); 190 if (locknum > 25) 191 locknum = 25; 192 193 do { 194 if (locknum) 195 lock[0] = 'a' + i++; 196 197 if ((fd = open(lock, O_RDONLY)) == -1) { 198 if (errno == ENOENT) /* no such file */ 199 goto gotlock; 200 perror(lock); 201 unlink(LLOCK); 202 error("Cannot open %s", lock); 203 } 204 205 if (veryold(fd)) /* if true, this closes fd and unlinks lock */ 206 goto gotlock; 207 close(fd); 208 } while (i < locknum); 209 210 unlink(LLOCK); 211 error(locknum ? "Too many hacks running now." 212 : "There is a game in progress under your name."); 213 gotlock: 214 fd = creat(lock, FMASK); 215 if (unlink(LLOCK) == -1) 216 error("Cannot unlink %s.", LLOCK); 217 if (fd == -1) { 218 error("cannot creat lock file."); 219 } else { 220 if (write(fd, (char *)&hackpid, sizeof(hackpid)) 221 != sizeof(hackpid)) 222 error("cannot write lock"); 223 if (close(fd) == -1) 224 error("cannot close lock"); 225 } 226 } 227 228 #ifdef MAIL 229 230 /* 231 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 232 * I don't know the details of his implementation.] 233 * { Later note: he disliked my calling a general mailreader and felt that 234 * hack should do the paging itself. But when I get mail, I want to put it 235 * in some folder, reply, etc. - it would be unreasonable to put all these 236 * functions in hack. } 237 * The mail daemon '2' is at present not a real monster, but only a visual 238 * effect. Thus, makemon() is superfluous. This might become otherwise, 239 * however. The motion of '2' is less restrained than usual: diagonal moves 240 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 241 * in a ROOM, even when you are Blind. 242 * Its path should be longer when you are Telepat-hic and Blind. 243 * 244 * Interesting side effects: 245 * - You can get rich by sending yourself a lot of mail and selling 246 * it to the shopkeeper. Unfortunately mail isn't very valuable. 247 * - You might die in case '2' comes along at a critical moment during 248 * a fight and delivers a scroll the weight of which causes you to 249 * collapse. 250 * 251 * Possible extensions: 252 * - Open the file MAIL and do fstat instead of stat for efficiency. 253 * (But sh uses stat, so this cannot be too bad.) 254 * - Examine the mail and produce a scroll of mail called "From somebody". 255 * - Invoke MAILREADER in such a way that only this single letter is read. 256 * 257 * - Make him lose his mail when a Nymph steals the letter. 258 * - Do something to the text when the scroll is enchanted or cancelled. 259 */ 260 #include "def.mkroom.h" 261 static struct stat omstat, nmstat; 262 static char *mailbox; 263 static long laststattime; 264 265 void 266 getmailstatus(void) 267 { 268 if (!(mailbox = getenv("MAIL"))) 269 return; 270 if (stat(mailbox, &omstat)) { 271 #ifdef PERMANENT_MAILBOX 272 pline("Cannot get status of MAIL=%s .", mailbox); 273 mailbox = NULL; 274 #else 275 omstat.st_mtime = 0; 276 #endif /* PERMANENT_MAILBOX */ 277 } 278 } 279 280 void 281 ckmailstatus(void) 282 { 283 if (!mailbox 284 #ifdef MAILCKFREQ 285 || moves < laststattime + MAILCKFREQ 286 #endif /* MAILCKFREQ */ 287 ) 288 return; 289 laststattime = moves; 290 if (stat(mailbox, &nmstat)) { 291 #ifdef PERMANENT_MAILBOX 292 pline("Cannot get status of MAIL=%s anymore.", mailbox); 293 mailbox = NULL; 294 #else 295 nmstat.st_mtime = 0; 296 #endif /* PERMANENT_MAILBOX */ 297 } else if (nmstat.st_mtime > omstat.st_mtime) { 298 if (nmstat.st_size) 299 newmail(); 300 getmailstatus(); /* might be too late ... */ 301 } 302 } 303 304 static void 305 newmail(void) 306 { 307 /* produce a scroll of mail */ 308 struct obj *obj; 309 struct monst *md; 310 extern struct permonst pm_mail_daemon; 311 312 obj = mksobj(SCR_MAIL); 313 if (md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 314 mdrush(md, 0); 315 316 pline("\"Hello, %s! I have some mail for you.\"", plname); 317 if (md) { 318 if (dist(md->mx, md->my) > 2) 319 pline("\"Catch!\""); 320 more(); 321 322 /* let him disappear again */ 323 mdrush(md, 1); 324 mondead(md); 325 } 326 327 obj = addinv(obj); 328 identify(obj); /* set known and do prinv() */ 329 } 330 331 /* make md run through the cave */ 332 static void 333 mdrush(struct monst *md, bool away) 334 { 335 int uroom = inroom(u.ux, u.uy); 336 337 if (uroom >= 0) { 338 int tmp = rooms[uroom].fdoor; 339 int cnt = rooms[uroom].doorct; 340 int fx = u.ux, fy = u.uy; 341 while (cnt--) { 342 if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) { 343 fx = doors[tmp].x; 344 fy = doors[tmp].y; 345 } 346 tmp++; 347 } 348 tmp_at(-1, md->data->mlet); /* open call */ 349 if (away) { /* interchange origin and destination */ 350 unpmon(md); 351 tmp = fx; 352 fx = md->mx; 353 md->mx = tmp; 354 tmp = fy; 355 fy = md->my; 356 md->my = tmp; 357 } 358 while (fx != md->mx || fy != md->my) { 359 int dx, dy, nfx = fx, nfy = fy, d1, d2; 360 361 tmp_at(fx, fy); 362 d1 = DIST(fx, fy, md->mx, md->my); 363 for (dx = -1; dx <= 1; dx++) 364 for (dy = -1; dy <= 1; dy++) 365 if (dx || dy) { 366 d2 = DIST(fx + dx, fy + dy, md->mx, md->my); 367 if (d2 < d1) { 368 d1 = d2; 369 nfx = fx + dx; 370 nfy = fy + dy; 371 } 372 } 373 if (nfx != fx || nfy != fy) { 374 fx = nfx; 375 fy = nfy; 376 } else { 377 if (!away) { 378 md->mx = fx; 379 md->my = fy; 380 } 381 break; 382 } 383 } 384 tmp_at(-1, -1); /* close call */ 385 } 386 if (!away) 387 pmon(md); 388 } 389 390 void 391 readmail(void) 392 { 393 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 394 char *mr = NULL; 395 396 more(); 397 if (!(mr = getenv("MAILREADER"))) 398 mr = DEF_MAILREADER; 399 if (child(1)) { 400 execl(mr, mr, NULL); 401 exit(1); 402 } 403 #else /* DEF_MAILREADER */ 404 page_file(mailbox, FALSE); 405 #endif /* DEF_MAILREADER */ 406 /* get new stat; not entirely correct: there is a small time 407 * window where we do not see new mail */ 408 getmailstatus(); 409 } 410 #endif /* MAIL */ 411 412 void 413 regularize(char *s) /* normalize file name - we don't like ..'s or /'s */ 414 { 415 char *lp; 416 417 while ((lp = strchr(s, '.')) || (lp = strchr(s, '/'))) 418 *lp = '_'; 419 } 420