1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */ 2 /* hack.unix.c - version 1.0.3 */ 3 4 /* This file collects some Unix dependencies; hack.pager.c contains some more */ 5 6 /* 7 * The time is used for: 8 * - seed for random() 9 * - year on tombstone and yymmdd in record file 10 * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON) 11 * - night and midnight (the undead are dangerous at midnight) 12 * - determination of what files are "very old" 13 */ 14 15 #include <stdio.h> 16 #include <errno.h> 17 #include "hack.h" /* mainly for index() which depends on BSD */ 18 19 #include <sys/types.h> /* for time_t and stat */ 20 #include <sys/stat.h> 21 #ifdef BSD 22 #include <sys/time.h> 23 #else 24 #include <time.h> 25 #endif BSD 26 27 extern char *getenv(); 28 extern time_t time(); 29 30 setrandom() 31 { 32 (void) srandom((int) time ((time_t *) 0)); 33 } 34 35 struct tm * 36 getlt() 37 { 38 time_t date; 39 struct tm *localtime(); 40 41 (void) time(&date); 42 return(localtime(&date)); 43 } 44 45 getyear() 46 { 47 return(1900 + getlt()->tm_year); 48 } 49 50 char * 51 getdate() 52 { 53 static char datestr[7]; 54 register struct tm *lt = getlt(); 55 56 (void) sprintf(datestr, "%2d%2d%2d", 57 lt->tm_year, lt->tm_mon + 1, lt->tm_mday); 58 if(datestr[2] == ' ') datestr[2] = '0'; 59 if(datestr[4] == ' ') datestr[4] = '0'; 60 return(datestr); 61 } 62 63 phase_of_the_moon() /* 0-7, with 0: new, 4: full */ 64 { /* moon period: 29.5306 days */ 65 /* year: 365.2422 days */ 66 register struct tm *lt = getlt(); 67 register 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 night() 79 { 80 register int hour = getlt()->tm_hour; 81 82 return(hour < 6 || hour > 21); 83 } 84 85 midnight() 86 { 87 return(getlt()->tm_hour == 0); 88 } 89 90 struct stat buf, hbuf; 91 92 gethdate(name) char *name; { 93 /* old version - for people short of space */ 94 /* 95 /* register char *np; 96 /* if(stat(name, &hbuf)) 97 /* error("Cannot get status of %s.", 98 /* (np = rindex(name, '/')) ? np+1 : name); 99 /* 100 /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */ 101 102 103 /* 104 * The problem with #include <sys/param.h> is that this include file 105 * does not exist on all systems, and moreover, that it sometimes includes 106 * <sys/types.h> again, so that the compiler sees these typedefs twice. 107 */ 108 #define MAXPATHLEN 1024 109 110 register char *np, *path; 111 char filename[MAXPATHLEN+1]; 112 if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL) 113 path = ""; 114 115 for (;;) { 116 if ((np = index(path, ':')) == NULL) 117 np = path + strlen(path); /* point to end str */ 118 if (np - path <= 1) /* %% */ 119 (void) strcpy(filename, name); 120 else { 121 (void) strncpy(filename, path, np - path); 122 filename[np - path] = '/'; 123 (void) strcpy(filename + (np - path) + 1, name); 124 } 125 if (stat(filename, &hbuf) == 0) 126 return; 127 if (*np == '\0') 128 break; 129 path = np + 1; 130 } 131 error("Cannot get status of %s.", 132 (np = rindex(name, '/')) ? np+1 : name); 133 } 134 135 uptodate(fd) { 136 if(fstat(fd, &buf)) { 137 pline("Cannot get status of saved level? "); 138 return(0); 139 } 140 if(buf.st_mtime < hbuf.st_mtime) { 141 pline("Saved level is out of date. "); 142 return(0); 143 } 144 return(1); 145 } 146 147 /* see whether we should throw away this xlock file */ 148 veryold(fd) { 149 register int i; 150 time_t date; 151 152 if(fstat(fd, &buf)) return(0); /* cannot get status */ 153 if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */ 154 (void) time(&date); 155 if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */ 156 extern int errno; 157 int lockedpid; /* should be the same size as hackpid */ 158 159 if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) != 160 sizeof(lockedpid)) 161 /* strange ... */ 162 return(0); 163 164 /* From: Rick Adams <seismo!rick> 165 /* This will work on 4.1cbsd, 4.2bsd and system 3? & 5. 166 /* It will do nothing on V7 or 4.1bsd. */ 167 if(!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 168 return(0); 169 } 170 (void) close(fd); 171 for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 172 glo(i); 173 (void) unlink(lock); 174 } 175 glo(0); 176 if(unlink(lock)) return(0); /* cannot remove it */ 177 return(1); /* success! */ 178 } 179 180 getlock() 181 { 182 extern int errno, hackpid, locknum; 183 register int i = 0, fd; 184 185 (void) fflush(stdout); 186 187 /* we ignore QUIT and INT at this point */ 188 if (link(HLOCK, LLOCK) == -1) { 189 register int errnosv = errno; 190 191 perror(HLOCK); 192 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 193 switch(errnosv) { 194 case ENOENT: 195 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 196 break; 197 case EACCES: 198 printf("It seems you don't have write permission here.\n"); 199 break; 200 case EEXIST: 201 printf("(Try again or rm %s.)\n", LLOCK); 202 break; 203 default: 204 printf("I don't know what is wrong."); 205 } 206 getret(); 207 error(""); 208 /*NOTREACHED*/ 209 } 210 211 regularize(lock); 212 glo(0); 213 if(locknum > 25) locknum = 25; 214 215 do { 216 if(locknum) lock[0] = 'a' + i++; 217 218 if((fd = open(lock, 0)) == -1) { 219 if(errno == ENOENT) goto gotlock; /* no such file */ 220 perror(lock); 221 (void) unlink(LLOCK); 222 error("Cannot open %s", lock); 223 } 224 225 if(veryold(fd)) /* if true, this closes fd and unlinks lock */ 226 goto gotlock; 227 (void) close(fd); 228 } while(i < locknum); 229 230 (void) unlink(LLOCK); 231 error(locknum ? "Too many hacks running now." 232 : "There is a game in progress under your name."); 233 gotlock: 234 fd = creat(lock, FMASK); 235 if(unlink(LLOCK) == -1) 236 error("Cannot unlink %s.", LLOCK); 237 if(fd == -1) { 238 error("cannot creat lock file."); 239 } else { 240 if(write(fd, (char *) &hackpid, sizeof(hackpid)) 241 != sizeof(hackpid)){ 242 error("cannot write lock"); 243 } 244 if(close(fd) == -1) { 245 error("cannot close lock"); 246 } 247 } 248 } 249 250 #ifdef MAIL 251 252 /* 253 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 254 * I don't know the details of his implementation.] 255 * { Later note: he disliked my calling a general mailreader and felt that 256 * hack should do the paging itself. But when I get mail, I want to put it 257 * in some folder, reply, etc. - it would be unreasonable to put all these 258 * functions in hack. } 259 * The mail daemon '2' is at present not a real monster, but only a visual 260 * effect. Thus, makemon() is superfluous. This might become otherwise, 261 * however. The motion of '2' is less restrained than usual: diagonal moves 262 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 263 * in a ROOM, even when you are Blind. 264 * Its path should be longer when you are Telepat-hic and Blind. 265 * 266 * Interesting side effects: 267 * - You can get rich by sending yourself a lot of mail and selling 268 * it to the shopkeeper. Unfortunately mail isn't very valuable. 269 * - You might die in case '2' comes along at a critical moment during 270 * a fight and delivers a scroll the weight of which causes you to 271 * collapse. 272 * 273 * Possible extensions: 274 * - Open the file MAIL and do fstat instead of stat for efficiency. 275 * (But sh uses stat, so this cannot be too bad.) 276 * - Examine the mail and produce a scroll of mail called "From somebody". 277 * - Invoke MAILREADER in such a way that only this single letter is read. 278 * 279 * - Make him lose his mail when a Nymph steals the letter. 280 * - Do something to the text when the scroll is enchanted or cancelled. 281 */ 282 #include "def.mkroom.h" 283 static struct stat omstat,nmstat; 284 static char *mailbox; 285 static long laststattime; 286 287 getmailstatus() { 288 if(!(mailbox = getenv("MAIL"))) 289 return; 290 if(stat(mailbox, &omstat)){ 291 #ifdef PERMANENT_MAILBOX 292 pline("Cannot get status of MAIL=%s .", mailbox); 293 mailbox = 0; 294 #else 295 omstat.st_mtime = 0; 296 #endif PERMANENT_MAILBOX 297 } 298 } 299 300 ckmailstatus() { 301 if(!mailbox 302 #ifdef MAILCKFREQ 303 || moves < laststattime + MAILCKFREQ 304 #endif MAILCKFREQ 305 ) 306 return; 307 laststattime = moves; 308 if(stat(mailbox, &nmstat)){ 309 #ifdef PERMANENT_MAILBOX 310 pline("Cannot get status of MAIL=%s anymore.", mailbox); 311 mailbox = 0; 312 #else 313 nmstat.st_mtime = 0; 314 #endif PERMANENT_MAILBOX 315 } else if(nmstat.st_mtime > omstat.st_mtime) { 316 if(nmstat.st_size) 317 newmail(); 318 getmailstatus(); /* might be too late ... */ 319 } 320 } 321 322 newmail() { 323 /* produce a scroll of mail */ 324 register struct obj *obj; 325 register struct monst *md; 326 extern char plname[]; 327 extern struct obj *mksobj(), *addinv(); 328 extern struct monst *makemon(); 329 extern struct permonst pm_mail_daemon; 330 331 obj = mksobj(SCR_MAIL); 332 if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 333 mdrush(md,0); 334 335 pline("\"Hello, %s! I have some mail for you.\"", plname); 336 if(md) { 337 if(dist(md->mx,md->my) > 2) 338 pline("\"Catch!\""); 339 more(); 340 341 /* let him disappear again */ 342 mdrush(md,1); 343 mondead(md); 344 } 345 346 obj = addinv(obj); 347 (void) identify(obj); /* set known and do prinv() */ 348 } 349 350 /* make md run through the cave */ 351 mdrush(md,away) 352 register struct monst *md; 353 boolean away; 354 { 355 register int uroom = inroom(u.ux, u.uy); 356 if(uroom >= 0) { 357 register int tmp = rooms[uroom].fdoor; 358 register int cnt = rooms[uroom].doorct; 359 register int fx = u.ux, fy = u.uy; 360 while(cnt--) { 361 if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){ 362 fx = doors[tmp].x; 363 fy = doors[tmp].y; 364 } 365 tmp++; 366 } 367 tmp_at(-1, md->data->mlet); /* open call */ 368 if(away) { /* interchange origin and destination */ 369 unpmon(md); 370 tmp = fx; fx = md->mx; md->mx = tmp; 371 tmp = fy; fy = md->my; md->my = tmp; 372 } 373 while(fx != md->mx || fy != md->my) { 374 register int dx,dy,nfx = fx,nfy = fy,d1,d2; 375 376 tmp_at(fx,fy); 377 d1 = DIST(fx,fy,md->mx,md->my); 378 for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 379 if(dx || dy) { 380 d2 = DIST(fx+dx,fy+dy,md->mx,md->my); 381 if(d2 < d1) { 382 d1 = d2; 383 nfx = fx+dx; 384 nfy = fy+dy; 385 } 386 } 387 if(nfx != fx || nfy != fy) { 388 fx = nfx; 389 fy = nfy; 390 } else { 391 if(!away) { 392 md->mx = fx; 393 md->my = fy; 394 } 395 break; 396 } 397 } 398 tmp_at(-1,-1); /* close call */ 399 } 400 if(!away) 401 pmon(md); 402 } 403 404 readmail() { 405 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 406 register char *mr = 0; 407 more(); 408 if(!(mr = getenv("MAILREADER"))) 409 mr = DEF_MAILREADER; 410 if(child(1)){ 411 execl(mr, mr, (char *) 0); 412 exit(1); 413 } 414 #else DEF_MAILREADER 415 (void) page_file(mailbox, FALSE); 416 #endif DEF_MAILREADER 417 /* get new stat; not entirely correct: there is a small time 418 window where we do not see new mail */ 419 getmailstatus(); 420 } 421 #endif MAIL 422 423 regularize(s) /* normalize file name - we don't like ..'s or /'s */ 424 register char *s; 425 { 426 register char *lp; 427 428 while((lp = index(s, '.')) || (lp = index(s, '/'))) 429 *lp = '_'; 430 } 431