hack/hack.unix.c

   1 /*      $NetBSD: hack.unix.c,v 1.8 2001/03/25 20:44:03 jsm Exp $        */
   2
   3 /*
   4  * Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
   5  */
   6
   7 #include <sys/cdefs.h>
   8 #ifndef lint
   9 __RCSID("$NetBSD: hack.unix.c,v 1.8 2001/03/25 20:44:03 jsm Exp $");
  10 #endif                          /* not lint */
  11
  12 /* This file collects some Unix dependencies; hack.pager.c contains some more */
  13
  14 /*
  15  * The time is used for:
  16  *      - seed for random()
  17  *      - year on tombstone and yymmdd in record file
  18  *      - phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
  19  *      - night and midnight (the undead are dangerous at midnight)
  20  *      - determination of what files are "very old"
  21  */
  22
  23 #include <errno.h>
  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 #include <stdlib.h>
  32 #include <unistd.h>
  33 #include <signal.h>
  34 #include <fcntl.h>
  35
  36 #include "hack.h"               /* mainly for strchr() which depends on BSD */
  37 #include "extern.h"
  38
  39 extern int locknum;
  40
  41
  42 void
  43 setrandom()
  44 {
  45         (void) srandom((int) time((time_t *) 0));
  46 }
  47
  48 struct tm      *
  49 getlt()
  50 {
  51         time_t          date;
  52
  53         (void) time(&date);
  54         return (localtime(&date));
  55 }
  56
  57 int
  58 getyear()
  59 {
  60         return (1900 + getlt()->tm_year);
  61 }
  62
  63 char           *
  64 getdate()
  65 {
  66         static char     datestr[7];
  67         struct tm      *lt = getlt();
  68
  69         (void) sprintf(datestr, "%02d%02d%02d",
  70                        lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday);
  71         return (datestr);
  72 }
  73
  74 int
  75 phase_of_the_moon()
  76 {                               /* 0-7, with 0: new, 4: full *//* moon
  77                                  * period: 29.5306 days */
  78         /* year: 365.2422 days */
  79         struct tm      *lt = getlt();
  80         int             epact, diy, golden;
  81
  82         diy = lt->tm_yday;
  83         golden = (lt->tm_year % 19) + 1;
  84         epact = (11 * golden + 18) % 30;
  85         if ((epact == 25 && golden > 11) || epact == 24)
  86                 epact++;
  87
  88         return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7);
  89 }
  90
  91 int
  92 night()
  93 {
  94         int             hour = getlt()->tm_hour;
  95
  96         return (hour < 6 || hour > 21);
  97 }
  98
  99 int
 100 midnight()
 101 {
 102         return (getlt()->tm_hour == 0);
 103 }
 104
 105 struct stat     buf, hbuf;
 106
 107 void
 108 gethdate(name)
 109         char           *name;
 110 {
 111 #if 0
 112         /* old version - for people short of space */
 113
 114         char *np;
 115
 116         if(stat(name, &hbuf))
 117             error("Cannot get status of %s.",
 118                 (np = strrchr(name, '/')) ? np+1 : name);
 119 #else
 120         /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */
 121
 122
 123         /*
 124          * The problem with   #include  <sys/param.h>   is that this include file
 125          * does not exist on all systems, and moreover, that it sometimes includes
 126          * <sys/types.h> again, so that the compiler sees these typedefs twice.
 127          */
 128 #define         MAXPATHLEN      1024
 129
 130         const char           *np, *path;
 131         char            filename[MAXPATHLEN + 1];
 132         if (strchr(name, '/') != NULL || (path = getenv("PATH")) == NULL)
 133                 path = "";
 134
 135         for (;;) {
 136                 if ((np = strchr(path, ':')) == NULL)
 137                         np = path + strlen(path);       /* point to end str */
 138                 if (np - path <= 1)     /* %% */
 139                         (void) strcpy(filename, name);
 140                 else {
 141                         (void) strncpy(filename, path, np - path);
 142                         filename[np - path] = '/';
 143                         (void) strcpy(filename + (np - path) + 1, name);
 144                 }
 145                 if (stat(filename, &hbuf) == 0)
 146                         return;
 147                 if (*np == '\0')
 148                         break;
 149                 path = np + 1;
 150         }
 151         error("Cannot get status of %s.",
 152               (np = strrchr(name, '/')) ? np + 1 : name);
 153 #endif
 154 }
 155
 156 int
 157 uptodate(int fd)
 158 {
 159         if (fstat(fd, &buf)) {
 160                 pline("Cannot get status of saved level? ");
 161                 return (0);
 162         }
 163         if (buf.st_mtime < hbuf.st_mtime) {
 164                 pline("Saved level is out of date. ");
 165                 return (0);
 166         }
 167         return (1);
 168 }
 169
 170 /* see whether we should throw away this xlock file */
 171 int
 172 veryold(fd)
 173         int fd;
 174 {
 175         int             i;
 176         time_t          date;
 177
 178         if (fstat(fd, &buf))
 179                 return (0);     /* cannot get status */
 180         if (buf.st_size != sizeof(int))
 181                 return (0);     /* not an xlock file */
 182         (void) time(&date);
 183         if (date - buf.st_mtime < 3L * 24L * 60L * 60L) {       /* recent */
 184                 int             lockedpid;      /* should be the same size as
 185                                                  * hackpid */
 186
 187                 if (read(fd, (char *) &lockedpid, sizeof(lockedpid)) !=
 188                     sizeof(lockedpid))
 189                         /* strange ... */
 190                         return (0);
 191
 192                 /*
 193                  * From: Rick Adams <seismo!rick> This will work on
 194                  * 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing
 195                  * on V7 or 4.1bsd.
 196                  */
 197                 if (!(kill(lockedpid, 0) == -1 && errno == ESRCH))
 198                         return (0);
 199         }
 200         (void) close(fd);
 201         for (i = 1; i <= MAXLEVEL; i++) {       /* try to remove all */
 202                 glo(i);
 203                 (void) unlink(lock);
 204         }
 205         glo(0);
 206         if (unlink(lock))
 207                 return (0);     /* cannot remove it */
 208         return (1);             /* success! */
 209 }
 210
 211 void
 212 getlock()
 213 {
 214         int             i = 0, fd;
 215
 216         (void) fflush(stdout);
 217
 218         /* we ignore QUIT and INT at this point */
 219         if (link(HLOCK, LLOCK) == -1) {
 220                 int             errnosv = errno;
 221
 222                 perror(HLOCK);
 223                 printf("Cannot link %s to %s\n", LLOCK, HLOCK);
 224                 switch (errnosv) {
 225                 case ENOENT:
 226                         printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
 227                         break;
 228                 case EACCES:
 229                         printf("It seems you don't have write permission here.\n");
 230                         break;
 231                 case EEXIST:
 232                         printf("(Try again or rm %s.)\n", LLOCK);
 233                         break;
 234                 default:
 235                         printf("I don't know what is wrong.");
 236                 }
 237                 getret();
 238                 error("%s", "");
 239                 /* NOTREACHED */
 240         }
 241         regularize(lock);
 242         glo(0);
 243         if (locknum > 25)
 244                 locknum = 25;
 245
 246         do {
 247                 if (locknum)
 248                         lock[0] = 'a' + i++;
 249
 250                 if ((fd = open(lock, O_RDONLY)) == -1) {
 251                         if (errno == ENOENT)
 252                                 goto gotlock;   /* no such file */
 253                         perror(lock);
 254                         (void) unlink(LLOCK);
 255                         error("Cannot open %s", lock);
 256                 }
 257                 if (veryold(fd))/* if true, this closes fd and unlinks lock */
 258                         goto gotlock;
 259                 (void) close(fd);
 260         } while (i < locknum);
 261
 262         (void) unlink(LLOCK);
 263         error(locknum ? "Too many hacks running now."
 264               : "There is a game in progress under your name.");
 265 gotlock:
 266         fd = creat(lock, FMASK);
 267         if (unlink(LLOCK) == -1)
 268                 error("Cannot unlink %s.", LLOCK);
 269         if (fd == -1) {
 270                 error("cannot creat lock file.");
 271         } else {
 272                 if (write(fd, (char *) &hackpid, sizeof(hackpid))
 273                     != sizeof(hackpid)) {
 274                         error("cannot write lock");
 275                 }
 276                 if (close(fd) == -1) {
 277                         error("cannot close lock");
 278                 }
 279         }
 280 }
 281
 282 #ifdef MAIL
 283
 284 /*
 285  * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
 286  * I don't know the details of his implementation.]
 287  * { Later note: he disliked my calling a general mailreader and felt that
 288  *   hack should do the paging itself. But when I get mail, I want to put it
 289  *   in some folder, reply, etc. - it would be unreasonable to put all these
 290  *   functions in hack. }
 291  * The mail daemon '2' is at present not a real monster, but only a visual
 292  * effect. Thus, makemon() is superfluous. This might become otherwise,
 293  * however. The motion of '2' is less restrained than usual: diagonal moves
 294  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
 295  * in a ROOM, even when you are Blind.
 296  * Its path should be longer when you are Telepat-hic and Blind.
 297  *
 298  * Interesting side effects:
 299  *      - You can get rich by sending yourself a lot of mail and selling
 300  *        it to the shopkeeper. Unfortunately mail isn't very valuable.
 301  *      - You might die in case '2' comes along at a critical moment during
 302  *        a fight and delivers a scroll the weight of which causes you to
 303  *        collapse.
 304  *
 305  * Possible extensions:
 306  *      - Open the file MAIL and do fstat instead of stat for efficiency.
 307  *        (But sh uses stat, so this cannot be too bad.)
 308  *      - Examine the mail and produce a scroll of mail called "From somebody".
 309  *      - Invoke MAILREADER in such a way that only this single letter is read.
 310  *
 311  *      - Make him lose his mail when a Nymph steals the letter.
 312  *      - Do something to the text when the scroll is enchanted or cancelled.
 313  */
 314 #include        "def.mkroom.h"
 315 static struct stat omstat, nmstat;
 316 static char    *mailbox;
 317 static long     laststattime;
 318
 319 void
 320 getmailstatus()
 321 {
 322         if (!(mailbox = getenv("MAIL")))
 323                 return;
 324         if (stat(mailbox, &omstat)) {
 325 #ifdef PERMANENT_MAILBOX
 326                 pline("Cannot get status of MAIL=%s .", mailbox);
 327                 mailbox = 0;
 328 #else
 329                 omstat.st_mtime = 0;
 330 #endif  /* PERMANENT_MAILBOX */
 331         }
 332 }
 333
 334 void
 335 ckmailstatus()
 336 {
 337         if (!mailbox
 338 #ifdef MAILCKFREQ
 339             || moves < laststattime + MAILCKFREQ
 340 #endif  /* MAILCKFREQ */
 341                 )
 342                 return;
 343         laststattime = moves;
 344         if (stat(mailbox, &nmstat)) {
 345 #ifdef PERMANENT_MAILBOX
 346                 pline("Cannot get status of MAIL=%s anymore.", mailbox);
 347                 mailbox = 0;
 348 #else
 349                 nmstat.st_mtime = 0;
 350 #endif  /* PERMANENT_MAILBOX */
 351         } else if (nmstat.st_mtime > omstat.st_mtime) {
 352                 if (nmstat.st_size)
 353                         newmail();
 354                 getmailstatus();/* might be too late ... */
 355         }
 356 }
 357
 358 void
 359 newmail()
 360 {
 361         /* produce a scroll of mail */
 362         struct obj     *obj;
 363         struct monst   *md;
 364
 365         obj = mksobj(SCR_MAIL);
 366         if (md = makemon(&pm_mail_daemon, u.ux, u.uy))  /* always succeeds */
 367                 mdrush(md, 0);
 368
 369         pline("\"Hello, %s! I have some mail for you.\"", plname);
 370         if (md) {
 371                 if (dist(md->mx, md->my) > 2)
 372                         pline("\"Catch!\"");
 373                 more();
 374
 375                 /* let him disappear again */
 376                 mdrush(md, 1);
 377                 mondead(md);
 378         }
 379         obj = addinv(obj);
 380         (void) identify(obj);   /* set known and do prinv() */
 381 }
 382
 383 /* make md run through the cave */
 384 void
 385 mdrush(md, away)
 386         struct monst   *md;
 387         boolean         away;
 388 {
 389         int             uroom = inroom(u.ux, u.uy);
 390         if (uroom >= 0) {
 391                 int             tmp = rooms[uroom].fdoor;
 392                 int             cnt = rooms[uroom].doorct;
 393                 int             fx = u.ux, fy = u.uy;
 394                 while (cnt--) {
 395                         if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) {
 396                                 fx = doors[tmp].x;
 397                                 fy = doors[tmp].y;
 398                         }
 399                         tmp++;
 400                 }
 401                 tmp_at(-1, md->data->mlet);     /* open call */
 402                 if (away) {     /* interchange origin and destination */
 403                         unpmon(md);
 404                         tmp = fx;
 405                         fx = md->mx;
 406                         md->mx = tmp;
 407                         tmp = fy;
 408                         fy = md->my;
 409                         md->my = tmp;
 410                 }
 411                 while (fx != md->mx || fy != md->my) {
 412                         int             dx, dy, nfx = fx, nfy = fy, d1,
 413                                         d2;
 414
 415                         tmp_at(fx, fy);
 416                         d1 = DIST(fx, fy, md->mx, md->my);
 417                         for (dx = -1; dx <= 1; dx++)
 418                                 for (dy = -1; dy <= 1; dy++)
 419                                         if (dx || dy) {
 420                                                 d2 = DIST(fx + dx, fy + dy, md->mx, md->my);
 421                                                 if (d2 < d1) {
 422                                                         d1 = d2;
 423                                                         nfx = fx + dx;
 424                                                         nfy = fy + dy;
 425                                                 }
 426                                         }
 427                         if (nfx != fx || nfy != fy) {
 428                                 fx = nfx;
 429                                 fy = nfy;
 430                         } else {
 431                                 if (!away) {
 432                                         md->mx = fx;
 433                                         md->my = fy;
 434                                 }
 435                                 break;
 436                         }
 437                 }
 438                 tmp_at(-1, -1); /* close call */
 439         }
 440         if (!away)
 441                 pmon(md);
 442 }
 443
 444 void
 445 readmail()
 446 {
 447 #ifdef DEF_MAILREADER           /* This implies that UNIX is defined */
 448         char           *mr = 0;
 449         more();
 450         if (!(mr = getenv("MAILREADER")))
 451                 mr = DEF_MAILREADER;
 452         if (child(1)) {
 453                 execl(mr, mr, (char *) 0);
 454                 exit(1);
 455         }
 456 #else   /* DEF_MAILREADER */
 457         (void) page_file(mailbox, FALSE);
 458 #endif  /* DEF_MAILREADER */
 459         /*
 460          * get new stat; not entirely correct: there is a small time window
 461          * where we do not see new mail
 462          */
 463         getmailstatus();
 464 }
 465 #endif  /* MAIL */
 466
 467 void
 468 regularize(s)                   /* normalize file name - we don't like ..'s
 469                                  * or /'s */
 470         char           *s;
 471 {
 472         char           *lp;
 473
 474         while ((lp = strchr(s, '.')) || (lp = strchr(s, '/')))
 475                 *lp = '_';
 476 }