1 /* 2 * Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. 3 */ 4 5 #ifndef lint 6 static char rcsid[] = "$NetBSD: hack.unix.c,v 1.4 1996/02/06 22:47:25 jtc Exp $"; 7 #endif /* not lint */ 8 9 /* This file collects some Unix dependencies; hack.pager.c contains some more */ 10 11 /* 12 * The time is used for: 13 * - seed for random() 14 * - year on tombstone and yymmdd in record file 15 * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON) 16 * - night and midnight (the undead are dangerous at midnight) 17 * - determination of what files are "very old" 18 */ 19 20 #include <stdio.h> 21 #include <errno.h> 22 #include "hack.h" /* mainly for index() which depends on BSD */ 23 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 32 extern char *getenv(); 33 extern time_t time(); 34 35 setrandom() 36 { 37 (void) srandom((int) time ((time_t *) 0)); 38 } 39 40 struct tm * 41 getlt() 42 { 43 time_t date; 44 struct tm *localtime(); 45 46 (void) time(&date); 47 return(localtime(&date)); 48 } 49 50 getyear() 51 { 52 return(1900 + getlt()->tm_year); 53 } 54 55 char * 56 getdate() 57 { 58 static char datestr[7]; 59 register struct tm *lt = getlt(); 60 61 (void) sprintf(datestr, "%2d%2d%2d", 62 lt->tm_year, lt->tm_mon + 1, lt->tm_mday); 63 if(datestr[2] == ' ') datestr[2] = '0'; 64 if(datestr[4] == ' ') datestr[4] = '0'; 65 return(datestr); 66 } 67 68 phase_of_the_moon() /* 0-7, with 0: new, 4: full */ 69 { /* moon period: 29.5306 days */ 70 /* year: 365.2422 days */ 71 register struct tm *lt = getlt(); 72 register int epact, diy, golden; 73 74 diy = lt->tm_yday; 75 golden = (lt->tm_year % 19) + 1; 76 epact = (11 * golden + 18) % 30; 77 if ((epact == 25 && golden > 11) || epact == 24) 78 epact++; 79 80 return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 ); 81 } 82 83 night() 84 { 85 register int hour = getlt()->tm_hour; 86 87 return(hour < 6 || hour > 21); 88 } 89 90 midnight() 91 { 92 return(getlt()->tm_hour == 0); 93 } 94 95 struct stat buf, hbuf; 96 97 gethdate(name) char *name; { 98 /* old version - for people short of space */ 99 /* 100 register char *np; 101 if(stat(name, &hbuf)) 102 error("Cannot get status of %s.", 103 (np = rindex(name, '/')) ? np+1 : name); 104 105 version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */ 106 107 108 /* 109 * The problem with #include <sys/param.h> is that this include file 110 * does not exist on all systems, and moreover, that it sometimes includes 111 * <sys/types.h> again, so that the compiler sees these typedefs twice. 112 */ 113 #define MAXPATHLEN 1024 114 115 register char *np, *path; 116 char filename[MAXPATHLEN+1]; 117 if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL) 118 path = ""; 119 120 for (;;) { 121 if ((np = index(path, ':')) == NULL) 122 np = path + strlen(path); /* point to end str */ 123 if (np - path <= 1) /* %% */ 124 (void) strcpy(filename, name); 125 else { 126 (void) strncpy(filename, path, np - path); 127 filename[np - path] = '/'; 128 (void) strcpy(filename + (np - path) + 1, name); 129 } 130 if (stat(filename, &hbuf) == 0) 131 return; 132 if (*np == '\0') 133 break; 134 path = np + 1; 135 } 136 error("Cannot get status of %s.", 137 (np = rindex(name, '/')) ? np+1 : name); 138 } 139 140 uptodate(fd) { 141 if(fstat(fd, &buf)) { 142 pline("Cannot get status of saved level? "); 143 return(0); 144 } 145 if(buf.st_mtime < hbuf.st_mtime) { 146 pline("Saved level is out of date. "); 147 return(0); 148 } 149 return(1); 150 } 151 152 /* see whether we should throw away this xlock file */ 153 veryold(fd) { 154 register int i; 155 time_t date; 156 157 if(fstat(fd, &buf)) return(0); /* cannot get status */ 158 if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */ 159 (void) time(&date); 160 if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */ 161 int lockedpid; /* should be the same size as hackpid */ 162 163 if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) != 164 sizeof(lockedpid)) 165 /* strange ... */ 166 return(0); 167 168 /* From: Rick Adams <seismo!rick> 169 This will work on 4.1cbsd, 4.2bsd and system 3? & 5. 170 It will do nothing on V7 or 4.1bsd. */ 171 if(!(kill(lockedpid, 0) == -1 && errno == ESRCH)) 172 return(0); 173 } 174 (void) close(fd); 175 for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ 176 glo(i); 177 (void) unlink(lock); 178 } 179 glo(0); 180 if(unlink(lock)) return(0); /* cannot remove it */ 181 return(1); /* success! */ 182 } 183 184 getlock() 185 { 186 extern int hackpid, locknum; 187 register int i = 0, fd; 188 189 (void) fflush(stdout); 190 191 /* we ignore QUIT and INT at this point */ 192 if (link(HLOCK, LLOCK) == -1) { 193 register int errnosv = errno; 194 195 perror(HLOCK); 196 printf("Cannot link %s to %s\n", LLOCK, HLOCK); 197 switch(errnosv) { 198 case ENOENT: 199 printf("Perhaps there is no (empty) file %s ?\n", HLOCK); 200 break; 201 case EACCES: 202 printf("It seems you don't have write permission here.\n"); 203 break; 204 case EEXIST: 205 printf("(Try again or rm %s.)\n", LLOCK); 206 break; 207 default: 208 printf("I don't know what is wrong."); 209 } 210 getret(); 211 error(""); 212 /*NOTREACHED*/ 213 } 214 215 regularize(lock); 216 glo(0); 217 if(locknum > 25) locknum = 25; 218 219 do { 220 if(locknum) lock[0] = 'a' + i++; 221 222 if((fd = open(lock, 0)) == -1) { 223 if(errno == ENOENT) goto gotlock; /* no such file */ 224 perror(lock); 225 (void) unlink(LLOCK); 226 error("Cannot open %s", lock); 227 } 228 229 if(veryold(fd)) /* if true, this closes fd and unlinks lock */ 230 goto gotlock; 231 (void) close(fd); 232 } while(i < locknum); 233 234 (void) unlink(LLOCK); 235 error(locknum ? "Too many hacks running now." 236 : "There is a game in progress under your name."); 237 gotlock: 238 fd = creat(lock, FMASK); 239 if(unlink(LLOCK) == -1) 240 error("Cannot unlink %s.", LLOCK); 241 if(fd == -1) { 242 error("cannot creat lock file."); 243 } else { 244 if(write(fd, (char *) &hackpid, sizeof(hackpid)) 245 != sizeof(hackpid)){ 246 error("cannot write lock"); 247 } 248 if(close(fd) == -1) { 249 error("cannot close lock"); 250 } 251 } 252 } 253 254 #ifdef MAIL 255 256 /* 257 * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but 258 * I don't know the details of his implementation.] 259 * { Later note: he disliked my calling a general mailreader and felt that 260 * hack should do the paging itself. But when I get mail, I want to put it 261 * in some folder, reply, etc. - it would be unreasonable to put all these 262 * functions in hack. } 263 * The mail daemon '2' is at present not a real monster, but only a visual 264 * effect. Thus, makemon() is superfluous. This might become otherwise, 265 * however. The motion of '2' is less restrained than usual: diagonal moves 266 * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible 267 * in a ROOM, even when you are Blind. 268 * Its path should be longer when you are Telepat-hic and Blind. 269 * 270 * Interesting side effects: 271 * - You can get rich by sending yourself a lot of mail and selling 272 * it to the shopkeeper. Unfortunately mail isn't very valuable. 273 * - You might die in case '2' comes along at a critical moment during 274 * a fight and delivers a scroll the weight of which causes you to 275 * collapse. 276 * 277 * Possible extensions: 278 * - Open the file MAIL and do fstat instead of stat for efficiency. 279 * (But sh uses stat, so this cannot be too bad.) 280 * - Examine the mail and produce a scroll of mail called "From somebody". 281 * - Invoke MAILREADER in such a way that only this single letter is read. 282 * 283 * - Make him lose his mail when a Nymph steals the letter. 284 * - Do something to the text when the scroll is enchanted or cancelled. 285 */ 286 #include "def.mkroom.h" 287 static struct stat omstat,nmstat; 288 static char *mailbox; 289 static long laststattime; 290 291 getmailstatus() { 292 if(!(mailbox = getenv("MAIL"))) 293 return; 294 if(stat(mailbox, &omstat)){ 295 #ifdef PERMANENT_MAILBOX 296 pline("Cannot get status of MAIL=%s .", mailbox); 297 mailbox = 0; 298 #else 299 omstat.st_mtime = 0; 300 #endif PERMANENT_MAILBOX 301 } 302 } 303 304 ckmailstatus() { 305 if(!mailbox 306 #ifdef MAILCKFREQ 307 || moves < laststattime + MAILCKFREQ 308 #endif MAILCKFREQ 309 ) 310 return; 311 laststattime = moves; 312 if(stat(mailbox, &nmstat)){ 313 #ifdef PERMANENT_MAILBOX 314 pline("Cannot get status of MAIL=%s anymore.", mailbox); 315 mailbox = 0; 316 #else 317 nmstat.st_mtime = 0; 318 #endif PERMANENT_MAILBOX 319 } else if(nmstat.st_mtime > omstat.st_mtime) { 320 if(nmstat.st_size) 321 newmail(); 322 getmailstatus(); /* might be too late ... */ 323 } 324 } 325 326 newmail() { 327 /* produce a scroll of mail */ 328 register struct obj *obj; 329 register struct monst *md; 330 extern char plname[]; 331 extern struct obj *mksobj(), *addinv(); 332 extern struct monst *makemon(); 333 extern struct permonst pm_mail_daemon; 334 335 obj = mksobj(SCR_MAIL); 336 if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ 337 mdrush(md,0); 338 339 pline("\"Hello, %s! I have some mail for you.\"", plname); 340 if(md) { 341 if(dist(md->mx,md->my) > 2) 342 pline("\"Catch!\""); 343 more(); 344 345 /* let him disappear again */ 346 mdrush(md,1); 347 mondead(md); 348 } 349 350 obj = addinv(obj); 351 (void) identify(obj); /* set known and do prinv() */ 352 } 353 354 /* make md run through the cave */ 355 mdrush(md,away) 356 register struct monst *md; 357 boolean away; 358 { 359 register int uroom = inroom(u.ux, u.uy); 360 if(uroom >= 0) { 361 register int tmp = rooms[uroom].fdoor; 362 register int cnt = rooms[uroom].doorct; 363 register int fx = u.ux, fy = u.uy; 364 while(cnt--) { 365 if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){ 366 fx = doors[tmp].x; 367 fy = doors[tmp].y; 368 } 369 tmp++; 370 } 371 tmp_at(-1, md->data->mlet); /* open call */ 372 if(away) { /* interchange origin and destination */ 373 unpmon(md); 374 tmp = fx; fx = md->mx; md->mx = tmp; 375 tmp = fy; fy = md->my; md->my = tmp; 376 } 377 while(fx != md->mx || fy != md->my) { 378 register int dx,dy,nfx = fx,nfy = fy,d1,d2; 379 380 tmp_at(fx,fy); 381 d1 = DIST(fx,fy,md->mx,md->my); 382 for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 383 if(dx || dy) { 384 d2 = DIST(fx+dx,fy+dy,md->mx,md->my); 385 if(d2 < d1) { 386 d1 = d2; 387 nfx = fx+dx; 388 nfy = fy+dy; 389 } 390 } 391 if(nfx != fx || nfy != fy) { 392 fx = nfx; 393 fy = nfy; 394 } else { 395 if(!away) { 396 md->mx = fx; 397 md->my = fy; 398 } 399 break; 400 } 401 } 402 tmp_at(-1,-1); /* close call */ 403 } 404 if(!away) 405 pmon(md); 406 } 407 408 readmail() { 409 #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 410 register char *mr = 0; 411 more(); 412 if(!(mr = getenv("MAILREADER"))) 413 mr = DEF_MAILREADER; 414 if(child(1)){ 415 execl(mr, mr, (char *) 0); 416 exit(1); 417 } 418 #else DEF_MAILREADER 419 (void) page_file(mailbox, FALSE); 420 #endif DEF_MAILREADER 421 /* get new stat; not entirely correct: there is a small time 422 window where we do not see new mail */ 423 getmailstatus(); 424 } 425 #endif MAIL 426 427 regularize(s) /* normalize file name - we don't like ..'s or /'s */ 428 register char *s; 429 { 430 register char *lp; 431 432 while((lp = index(s, '.')) || (lp = index(s, '/'))) 433 *lp = '_'; 434 } 435