hack/hack.unix.c

   1 /*      $NetBSD: hack.unix.c,v 1.6 1999/04/25 19:08:34 kristerw 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 1.6 1999/04/25 19:08:34 kristerw 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
  40 void
  41 setrandom()
  42 {
  43         (void) srandom((int) time((time_t *) 0));
  44 }
  45
  46 struct tm      *
  47 getlt()
  48 {
  49         time_t          date;
  50
  51         (void) time(&date);
  52         return (localtime(&date));
  53 }
  54
  55 int
  56 getyear()
  57 {
  58         return (1900 + getlt()->tm_year);
  59 }
  60
  61 char           *
  62 getdate()
  63 {
  64         static char     datestr[7];
  65         struct tm      *lt = getlt();
  66
  67         (void) sprintf(datestr, "%02d%02d%02d",
  68                        lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday);
  69         return (datestr);
  70 }
  71
  72 int
  73 phase_of_the_moon()
  74 {                               /* 0-7, with 0: new, 4: full *//* moon
  75                                  * period: 29.5306 days */
  76         /* year: 365.2422 days */
  77         struct tm      *lt = getlt();
  78         int             epact, diy, golden;
  79
  80         diy = lt->tm_yday;
  81         golden = (lt->tm_year % 19) + 1;
  82         epact = (11 * golden + 18) % 30;
  83         if ((epact == 25 && golden > 11) || epact == 24)
  84                 epact++;
  85
  86         return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7);
  87 }
  88
  89 int
  90 night()
  91 {
  92         int             hour = getlt()->tm_hour;
  93
  94         return (hour < 6 || hour > 21);
  95 }
  96
  97 int
  98 midnight()
  99 {
 100         return (getlt()->tm_hour == 0);
 101 }
 102
 103 struct stat     buf, hbuf;
 104
 105 void
 106 gethdate(name)
 107         char           *name;
 108 {
 109 #if 0
 110         /* old version - for people short of space */
 111
 112         char *np;
 113
 114         if(stat(name, &hbuf))
 115             error("Cannot get status of %s.",
 116                 (np = strrchr(name, '/')) ? np+1 : name);
 117 #else
 118         /* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */
 119
 120
 121         /*
 122          * The problem with   #include  <sys/param.h>   is that this include file
 123          * does not exist on all systems, and moreover, that it sometimes includes
 124          * <sys/types.h> again, so that the compiler sees these typedefs twice.
 125          */
 126 #define         MAXPATHLEN      1024
 127
 128         char           *np, *path;
 129         char            filename[MAXPATHLEN + 1];
 130         if (strchr(name, '/') != NULL || (path = getenv("PATH")) == NULL)
 131                 path = "";
 132
 133         for (;;) {
 134                 if ((np = strchr(path, ':')) == NULL)
 135                         np = path + strlen(path);       /* point to end str */
 136                 if (np - path <= 1)     /* %% */
 137                         (void) strcpy(filename, name);
 138                 else {
 139                         (void) strncpy(filename, path, np - path);
 140                         filename[np - path] = '/';
 141                         (void) strcpy(filename + (np - path) + 1, name);
 142                 }
 143                 if (stat(filename, &hbuf) == 0)
 144                         return;
 145                 if (*np == '\0')
 146                         break;
 147                 path = np + 1;
 148         }
 149         error("Cannot get status of %s.",
 150               (np = strrchr(name, '/')) ? np + 1 : name);
 151 #endif
 152 }
 153
 154 int
 155 uptodate(fd)
 156 {
 157         if (fstat(fd, &buf)) {
 158                 pline("Cannot get status of saved level? ");
 159                 return (0);
 160         }
 161         if (buf.st_mtime < hbuf.st_mtime) {
 162                 pline("Saved level is out of date. ");
 163                 return (0);
 164         }
 165         return (1);
 166 }
 167
 168 /* see whether we should throw away this xlock file */
 169 int
 170 veryold(fd)
 171         int fd;
 172 {
 173         int             i;
 174         time_t          date;
 175
 176         if (fstat(fd, &buf))
 177                 return (0);     /* cannot get status */
 178         if (buf.st_size != sizeof(int))
 179                 return (0);     /* not an xlock file */
 180         (void) time(&date);
 181         if (date - buf.st_mtime < 3L * 24L * 60L * 60L) {       /* recent */
 182                 int             lockedpid;      /* should be the same size as
 183                                                  * hackpid */
 184
 185                 if (read(fd, (char *) &lockedpid, sizeof(lockedpid)) !=
 186                     sizeof(lockedpid))
 187                         /* strange ... */
 188                         return (0);
 189
 190                 /*
 191                  * From: Rick Adams <seismo!rick> This will work on
 192                  * 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing
 193                  * on V7 or 4.1bsd.
 194                  */
 195                 if (!(kill(lockedpid, 0) == -1 && errno == ESRCH))
 196                         return (0);
 197         }
 198         (void) close(fd);
 199         for (i = 1; i <= MAXLEVEL; i++) {       /* try to remove all */
 200                 glo(i);
 201                 (void) unlink(lock);
 202         }
 203         glo(0);
 204         if (unlink(lock))
 205                 return (0);     /* cannot remove it */
 206         return (1);             /* success! */
 207 }
 208
 209 void
 210 getlock()
 211 {
 212         extern int      hackpid, locknum;
 213         int             i = 0, fd;
 214
 215         (void) fflush(stdout);
 216
 217         /* we ignore QUIT and INT at this point */
 218         if (link(HLOCK, LLOCK) == -1) {
 219                 int             errnosv = errno;
 220
 221                 perror(HLOCK);
 222                 printf("Cannot link %s to %s\n", LLOCK, HLOCK);
 223                 switch (errnosv) {
 224                 case ENOENT:
 225                         printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
 226                         break;
 227                 case EACCES:
 228                         printf("It seems you don't have write permission here.\n");
 229                         break;
 230                 case EEXIST:
 231                         printf("(Try again or rm %s.)\n", LLOCK);
 232                         break;
 233                 default:
 234                         printf("I don't know what is wrong.");
 235                 }
 236                 getret();
 237                 error("%s", "");
 238                 /* NOTREACHED */
 239         }
 240         regularize(lock);
 241         glo(0);
 242         if (locknum > 25)
 243                 locknum = 25;
 244
 245         do {
 246                 if (locknum)
 247                         lock[0] = 'a' + i++;
 248
 249                 if ((fd = open(lock, 0)) == -1) {
 250                         if (errno == ENOENT)
 251                                 goto gotlock;   /* no such file */
 252                         perror(lock);
 253                         (void) unlink(LLOCK);
 254                         error("Cannot open %s", lock);
 255                 }
 256                 if (veryold(fd))/* if true, this closes fd and unlinks lock */
 257                         goto gotlock;
 258                 (void) close(fd);
 259         } while (i < locknum);
 260
 261         (void) unlink(LLOCK);
 262         error(locknum ? "Too many hacks running now."
 263               : "There is a game in progress under your name.");
 264 gotlock:
 265         fd = creat(lock, FMASK);
 266         if (unlink(LLOCK) == -1)
 267                 error("Cannot unlink %s.", LLOCK);
 268         if (fd == -1) {
 269                 error("cannot creat lock file.");
 270         } else {
 271                 if (write(fd, (char *) &hackpid, sizeof(hackpid))
 272                     != sizeof(hackpid)) {
 273                         error("cannot write lock");
 274                 }
 275                 if (close(fd) == -1) {
 276                         error("cannot close lock");
 277                 }
 278         }
 279 }
 280
 281 #ifdef MAIL
 282
 283 /*
 284  * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
 285  * I don't know the details of his implementation.]
 286  * { Later note: he disliked my calling a general mailreader and felt that
 287  *   hack should do the paging itself. But when I get mail, I want to put it
 288  *   in some folder, reply, etc. - it would be unreasonable to put all these
 289  *   functions in hack. }
 290  * The mail daemon '2' is at present not a real monster, but only a visual
 291  * effect. Thus, makemon() is superfluous. This might become otherwise,
 292  * however. The motion of '2' is less restrained than usual: diagonal moves
 293  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
 294  * in a ROOM, even when you are Blind.
 295  * Its path should be longer when you are Telepat-hic and Blind.
 296  *
 297  * Interesting side effects:
 298  *      - You can get rich by sending yourself a lot of mail and selling
 299  *        it to the shopkeeper. Unfortunately mail isn't very valuable.
 300  *      - You might die in case '2' comes along at a critical moment during
 301  *        a fight and delivers a scroll the weight of which causes you to
 302  *        collapse.
 303  *
 304  * Possible extensions:
 305  *      - Open the file MAIL and do fstat instead of stat for efficiency.
 306  *        (But sh uses stat, so this cannot be too bad.)
 307  *      - Examine the mail and produce a scroll of mail called "From somebody".
 308  *      - Invoke MAILREADER in such a way that only this single letter is read.
 309  *
 310  *      - Make him lose his mail when a Nymph steals the letter.
 311  *      - Do something to the text when the scroll is enchanted or cancelled.
 312  */
 313 #include        "def.mkroom.h"
 314 static struct stat omstat, nmstat;
 315 static char    *mailbox;
 316 static long     laststattime;
 317
 318 void
 319 getmailstatus()
 320 {
 321         if (!(mailbox = getenv("MAIL")))
 322                 return;
 323         if (stat(mailbox, &omstat)) {
 324 #ifdef PERMANENT_MAILBOX
 325                 pline("Cannot get status of MAIL=%s .", mailbox);
 326                 mailbox = 0;
 327 #else
 328                 omstat.st_mtime = 0;
 329 #endif  /* PERMANENT_MAILBOX */
 330         }
 331 }
 332
 333 void
 334 ckmailstatus()
 335 {
 336         if (!mailbox
 337 #ifdef MAILCKFREQ
 338             || moves < laststattime + MAILCKFREQ
 339 #endif  /* MAILCKFREQ */
 340                 )
 341                 return;
 342         laststattime = moves;
 343         if (stat(mailbox, &nmstat)) {
 344 #ifdef PERMANENT_MAILBOX
 345                 pline("Cannot get status of MAIL=%s anymore.", mailbox);
 346                 mailbox = 0;
 347 #else
 348                 nmstat.st_mtime = 0;
 349 #endif  /* PERMANENT_MAILBOX */
 350         } else if (nmstat.st_mtime > omstat.st_mtime) {
 351                 if (nmstat.st_size)
 352                         newmail();
 353                 getmailstatus();/* might be too late ... */
 354         }
 355 }
 356
 357 void
 358 newmail()
 359 {
 360         /* produce a scroll of mail */
 361         struct obj     *obj;
 362         struct monst   *md;
 363
 364         obj = mksobj(SCR_MAIL);
 365         if (md = makemon(&pm_mail_daemon, u.ux, u.uy))  /* always succeeds */
 366                 mdrush(md, 0);
 367
 368         pline("\"Hello, %s! I have some mail for you.\"", plname);
 369         if (md) {
 370                 if (dist(md->mx, md->my) > 2)
 371                         pline("\"Catch!\"");
 372                 more();
 373
 374                 /* let him disappear again */
 375                 mdrush(md, 1);
 376                 mondead(md);
 377         }
 378         obj = addinv(obj);
 379         (void) identify(obj);   /* set known and do prinv() */
 380 }
 381
 382 /* make md run through the cave */
 383 void
 384 mdrush(md, away)
 385         struct monst   *md;
 386         boolean         away;
 387 {
 388         int             uroom = inroom(u.ux, u.uy);
 389         if (uroom >= 0) {
 390                 int             tmp = rooms[uroom].fdoor;
 391                 int             cnt = rooms[uroom].doorct;
 392                 int             fx = u.ux, fy = u.uy;
 393                 while (cnt--) {
 394                         if (dist(fx, fy) < dist(doors[tmp].x, doors[tmp].y)) {
 395                                 fx = doors[tmp].x;
 396                                 fy = doors[tmp].y;
 397                         }
 398                         tmp++;
 399                 }
 400                 tmp_at(-1, md->data->mlet);     /* open call */
 401                 if (away) {     /* interchange origin and destination */
 402                         unpmon(md);
 403                         tmp = fx;
 404                         fx = md->mx;
 405                         md->mx = tmp;
 406                         tmp = fy;
 407                         fy = md->my;
 408                         md->my = tmp;
 409                 }
 410                 while (fx != md->mx || fy != md->my) {
 411                         int             dx, dy, nfx = fx, nfy = fy, d1,
 412                                         d2;
 413
 414                         tmp_at(fx, fy);
 415                         d1 = DIST(fx, fy, md->mx, md->my);
 416                         for (dx = -1; dx <= 1; dx++)
 417                                 for (dy = -1; dy <= 1; dy++)
 418                                         if (dx || dy) {
 419                                                 d2 = DIST(fx + dx, fy + dy, md->mx, md->my);
 420                                                 if (d2 < d1) {
 421                                                         d1 = d2;
 422                                                         nfx = fx + dx;
 423                                                         nfy = fy + dy;
 424                                                 }
 425                                         }
 426                         if (nfx != fx || nfy != fy) {
 427                                 fx = nfx;
 428                                 fy = nfy;
 429                         } else {
 430                                 if (!away) {
 431                                         md->mx = fx;
 432                                         md->my = fy;
 433                                 }
 434                                 break;
 435                         }
 436                 }
 437                 tmp_at(-1, -1); /* close call */
 438         }
 439         if (!away)
 440                 pmon(md);
 441 }
 442
 443 void
 444 readmail()
 445 {
 446 #ifdef DEF_MAILREADER           /* This implies that UNIX is defined */
 447         char           *mr = 0;
 448         more();
 449         if (!(mr = getenv("MAILREADER")))
 450                 mr = DEF_MAILREADER;
 451         if (child(1)) {
 452                 execl(mr, mr, (char *) 0);
 453                 exit(1);
 454         }
 455 #else   /* DEF_MAILREADER */
 456         (void) page_file(mailbox, FALSE);
 457 #endif  /* DEF_MAILREADER */
 458         /*
 459          * get new stat; not entirely correct: there is a small time window
 460          * where we do not see new mail
 461          */
 462         getmailstatus();
 463 }
 464 #endif  /* MAIL */
 465
 466 void
 467 regularize(s)                   /* normalize file name - we don't like ..'s
 468                                  * or /'s */
 469         char           *s;
 470 {
 471         char           *lp;
 472
 473         while ((lp = strchr(s, '.')) || (lp = strchr(s, '/')))
 474                 *lp = '_';
 475 }