hack/hack.unix.c

   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 }