hack/hack.unix.c

   1 /*
   2  * Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
   3  */
   4
   5 #ifndef lint
   6 static char rcsid[] = "$NetBSD: hack.unix.c,v 1.3 1995/03/23 08:31:55 cgd 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                 extern int errno;
 162                 int lockedpid;  /* should be the same size as hackpid */
 163
 164                 if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=
 165                         sizeof(lockedpid))
 166                         /* strange ... */
 167                         return(0);
 168
 169                 /* From: Rick Adams <seismo!rick>
 170                 /* This will work on 4.1cbsd, 4.2bsd and system 3? & 5.
 171                 /* It will do nothing on V7 or 4.1bsd. */
 172                 if(!(kill(lockedpid, 0) == -1 && errno == ESRCH))
 173                         return(0);
 174         }
 175         (void) close(fd);
 176         for(i = 1; i <= MAXLEVEL; i++) {                /* try to remove all */
 177                 glo(i);
 178                 (void) unlink(lock);
 179         }
 180         glo(0);
 181         if(unlink(lock)) return(0);                     /* cannot remove it */
 182         return(1);                                      /* success! */
 183 }
 184
 185 getlock()
 186 {
 187         extern int errno, hackpid, locknum;
 188         register int i = 0, fd;
 189
 190         (void) fflush(stdout);
 191
 192         /* we ignore QUIT and INT at this point */
 193         if (link(HLOCK, LLOCK) == -1) {
 194                 register int errnosv = errno;
 195
 196                 perror(HLOCK);
 197                 printf("Cannot link %s to %s\n", LLOCK, HLOCK);
 198                 switch(errnosv) {
 199                 case ENOENT:
 200                     printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
 201                     break;
 202                 case EACCES:
 203                     printf("It seems you don't have write permission here.\n");
 204                     break;
 205                 case EEXIST:
 206                     printf("(Try again or rm %s.)\n", LLOCK);
 207                     break;
 208                 default:
 209                     printf("I don't know what is wrong.");
 210                 }
 211                 getret();
 212                 error("");
 213                 /*NOTREACHED*/
 214         }
 215
 216         regularize(lock);
 217         glo(0);
 218         if(locknum > 25) locknum = 25;
 219
 220         do {
 221                 if(locknum) lock[0] = 'a' + i++;
 222
 223                 if((fd = open(lock, 0)) == -1) {
 224                         if(errno == ENOENT) goto gotlock;    /* no such file */
 225                         perror(lock);
 226                         (void) unlink(LLOCK);
 227                         error("Cannot open %s", lock);
 228                 }
 229
 230                 if(veryold(fd)) /* if true, this closes fd and unlinks lock */
 231                         goto gotlock;
 232                 (void) close(fd);
 233         } while(i < locknum);
 234
 235         (void) unlink(LLOCK);
 236         error(locknum ? "Too many hacks running now."
 237                       : "There is a game in progress under your name.");
 238 gotlock:
 239         fd = creat(lock, FMASK);
 240         if(unlink(LLOCK) == -1)
 241                 error("Cannot unlink %s.", LLOCK);
 242         if(fd == -1) {
 243                 error("cannot creat lock file.");
 244         } else {
 245                 if(write(fd, (char *) &hackpid, sizeof(hackpid))
 246                     != sizeof(hackpid)){
 247                         error("cannot write lock");
 248                 }
 249                 if(close(fd) == -1) {
 250                         error("cannot close lock");
 251                 }
 252         }
 253 }
 254
 255 #ifdef MAIL
 256
 257 /*
 258  * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
 259  * I don't know the details of his implementation.]
 260  * { Later note: he disliked my calling a general mailreader and felt that
 261  *   hack should do the paging itself. But when I get mail, I want to put it
 262  *   in some folder, reply, etc. - it would be unreasonable to put all these
 263  *   functions in hack. }
 264  * The mail daemon '2' is at present not a real monster, but only a visual
 265  * effect. Thus, makemon() is superfluous. This might become otherwise,
 266  * however. The motion of '2' is less restrained than usual: diagonal moves
 267  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
 268  * in a ROOM, even when you are Blind.
 269  * Its path should be longer when you are Telepat-hic and Blind.
 270  *
 271  * Interesting side effects:
 272  *      - You can get rich by sending yourself a lot of mail and selling
 273  *        it to the shopkeeper. Unfortunately mail isn't very valuable.
 274  *      - You might die in case '2' comes along at a critical moment during
 275  *        a fight and delivers a scroll the weight of which causes you to
 276  *        collapse.
 277  *
 278  * Possible extensions:
 279  *      - Open the file MAIL and do fstat instead of stat for efficiency.
 280  *        (But sh uses stat, so this cannot be too bad.)
 281  *      - Examine the mail and produce a scroll of mail called "From somebody".
 282  *      - Invoke MAILREADER in such a way that only this single letter is read.
 283  *
 284  *      - Make him lose his mail when a Nymph steals the letter.
 285  *      - Do something to the text when the scroll is enchanted or cancelled.
 286  */
 287 #include        "def.mkroom.h"
 288 static struct stat omstat,nmstat;
 289 static char *mailbox;
 290 static long laststattime;
 291
 292 getmailstatus() {
 293         if(!(mailbox = getenv("MAIL")))
 294                 return;
 295         if(stat(mailbox, &omstat)){
 296 #ifdef PERMANENT_MAILBOX
 297                 pline("Cannot get status of MAIL=%s .", mailbox);
 298                 mailbox = 0;
 299 #else
 300                 omstat.st_mtime = 0;
 301 #endif PERMANENT_MAILBOX
 302         }
 303 }
 304
 305 ckmailstatus() {
 306         if(!mailbox
 307 #ifdef MAILCKFREQ
 308                     || moves < laststattime + MAILCKFREQ
 309 #endif MAILCKFREQ
 310                                                         )
 311                 return;
 312         laststattime = moves;
 313         if(stat(mailbox, &nmstat)){
 314 #ifdef PERMANENT_MAILBOX
 315                 pline("Cannot get status of MAIL=%s anymore.", mailbox);
 316                 mailbox = 0;
 317 #else
 318                 nmstat.st_mtime = 0;
 319 #endif PERMANENT_MAILBOX
 320         } else if(nmstat.st_mtime > omstat.st_mtime) {
 321                 if(nmstat.st_size)
 322                         newmail();
 323                 getmailstatus();        /* might be too late ... */
 324         }
 325 }
 326
 327 newmail() {
 328         /* produce a scroll of mail */
 329         register struct obj *obj;
 330         register struct monst *md;
 331         extern char plname[];
 332         extern struct obj *mksobj(), *addinv();
 333         extern struct monst *makemon();
 334         extern struct permonst pm_mail_daemon;
 335
 336         obj = mksobj(SCR_MAIL);
 337         if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */
 338                 mdrush(md,0);
 339
 340         pline("\"Hello, %s! I have some mail for you.\"", plname);
 341         if(md) {
 342                 if(dist(md->mx,md->my) > 2)
 343                         pline("\"Catch!\"");
 344                 more();
 345
 346                 /* let him disappear again */
 347                 mdrush(md,1);
 348                 mondead(md);
 349         }
 350
 351         obj = addinv(obj);
 352         (void) identify(obj);           /* set known and do prinv() */
 353 }
 354
 355 /* make md run through the cave */
 356 mdrush(md,away)
 357 register struct monst *md;
 358 boolean away;
 359 {
 360         register int uroom = inroom(u.ux, u.uy);
 361         if(uroom >= 0) {
 362                 register int tmp = rooms[uroom].fdoor;
 363                 register int cnt = rooms[uroom].doorct;
 364                 register int fx = u.ux, fy = u.uy;
 365                 while(cnt--) {
 366                         if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){
 367                                 fx = doors[tmp].x;
 368                                 fy = doors[tmp].y;
 369                         }
 370                         tmp++;
 371                 }
 372                 tmp_at(-1, md->data->mlet);     /* open call */
 373                 if(away) {      /* interchange origin and destination */
 374                         unpmon(md);
 375                         tmp = fx; fx = md->mx; md->mx = tmp;
 376                         tmp = fy; fy = md->my; md->my = tmp;
 377                 }
 378                 while(fx != md->mx || fy != md->my) {
 379                         register int dx,dy,nfx = fx,nfy = fy,d1,d2;
 380
 381                         tmp_at(fx,fy);
 382                         d1 = DIST(fx,fy,md->mx,md->my);
 383                         for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++)
 384                             if(dx || dy) {
 385                                 d2 = DIST(fx+dx,fy+dy,md->mx,md->my);
 386                                 if(d2 < d1) {
 387                                     d1 = d2;
 388                                     nfx = fx+dx;
 389                                     nfy = fy+dy;
 390                                 }
 391                             }
 392                         if(nfx != fx || nfy != fy) {
 393                             fx = nfx;
 394                             fy = nfy;
 395                         } else {
 396                             if(!away) {
 397                                 md->mx = fx;
 398                                 md->my = fy;
 399                             }
 400                             break;
 401                         }
 402                 }
 403                 tmp_at(-1,-1);                  /* close call */
 404         }
 405         if(!away)
 406                 pmon(md);
 407 }
 408
 409 readmail() {
 410 #ifdef DEF_MAILREADER                   /* This implies that UNIX is defined */
 411         register char *mr = 0;
 412         more();
 413         if(!(mr = getenv("MAILREADER")))
 414                 mr = DEF_MAILREADER;
 415         if(child(1)){
 416                 execl(mr, mr, (char *) 0);
 417                 exit(1);
 418         }
 419 #else DEF_MAILREADER
 420         (void) page_file(mailbox, FALSE);
 421 #endif DEF_MAILREADER
 422         /* get new stat; not entirely correct: there is a small time
 423            window where we do not see new mail */
 424         getmailstatus();
 425 }
 426 #endif MAIL
 427
 428 regularize(s)   /* normalize file name - we don't like ..'s or /'s */
 429 register char *s;
 430 {
 431         register char *lp;
 432
 433         while((lp = index(s, '.')) || (lp = index(s, '/')))
 434                 *lp = '_';
 435 }