games/hack/hack.unix.c

   1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
   2 /* hack.unix.c - version 1.0.3 */
   3 /* $FreeBSD: src/games/hack/hack.unix.c,v 1.8 1999/11/16 02:57:13 billf Exp $ */
   4 /* $DragonFly: src/games/hack/hack.unix.c,v 1.7 2006/08/21 19:45:32 pavalos Exp $ */
   5
   6 /* This file collects some Unix dependencies; hack.pager.c contains some more */
   7
   8 /*
   9  * The time is used for:
  10  *      - seed for random()
  11  *      - year on tombstone and yymmdd in record file
  12  *      - phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
  13  *      - night and midnight (the undead are dangerous at midnight)
  14  *      - determination of what files are "very old"
  15  */
  16
  17 #include <errno.h>
  18 #include "hack.h"       /* mainly for index() which depends on BSD */
  19
  20 #include        <sys/types.h>           /* for time_t and stat */
  21 #include        <sys/stat.h>
  22 #include        <time.h>
  23
  24 static struct tm        *getlt(void);
  25 static bool              veryold(int);
  26 #ifdef MAIL
  27 static void              newmail(void);
  28 static void              mdrush(struct monst *, bool);
  29 #endif
  30
  31 void
  32 setrandom(void)
  33 {
  34         srandomdev();
  35 }
  36
  37 static struct tm *
  38 getlt(void)
  39 {
  40         time_t date;
  41
  42         time(&date);
  43         return(localtime(&date));
  44 }
  45
  46 int
  47 getyear(void)
  48 {
  49         return(1900 + getlt()->tm_year);
  50 }
  51
  52 char *
  53 getdate(void)
  54 {
  55         static char datestr[7];
  56         struct tm *lt = getlt();
  57
  58         snprintf(datestr, sizeof(datestr), "%02d%02d%02d",
  59                 lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday);
  60         return(datestr);
  61 }
  62
  63 int
  64 phase_of_the_moon(void)                 /* 0-7, with 0: new, 4: full */
  65 {                                       /* moon period: 29.5306 days */
  66                                         /* year: 365.2422 days */
  67         struct tm *lt = getlt();
  68         int epact, diy, golden;
  69
  70         diy = lt->tm_yday;
  71         golden = (lt->tm_year % 19) + 1;
  72         epact = (11 * golden + 18) % 30;
  73         if ((epact == 25 && golden > 11) || epact == 24)
  74                 epact++;
  75
  76         return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 );
  77 }
  78
  79 bool
  80 night(void)
  81 {
  82         int hour = getlt()->tm_hour;
  83
  84         return(hour < 6 || hour > 21);
  85 }
  86
  87 bool
  88 midnight(void)
  89 {
  90         return(getlt()->tm_hour == 0);
  91 }
  92
  93 struct stat buf, hbuf;
  94
  95 void
  96 gethdate(const char *name)
  97 {
  98 /* old version - for people short of space */
  99 char *np;
 100
 101         name = "/usr/games/hide/hack";
 102         if(stat(name, &hbuf))
 103                 error("Cannot get status of %s.",
 104                         (np = rindex(name, '/')) ? np+1 : name);
 105 }
 106
 107 bool
 108 uptodate(int fd)
 109 {
 110         if(fstat(fd, &buf)) {
 111                 pline("Cannot get status of saved level? ");
 112                 return(0);
 113         }
 114         if(buf.st_mtime < hbuf.st_mtime) {
 115                 pline("Saved level is out of date. ");
 116                 return(0);
 117         }
 118         return(1);
 119 }
 120
 121 /* see whether we should throw away this xlock file */
 122 static bool
 123 veryold(int fd)
 124 {
 125         int i;
 126         time_t date;
 127
 128         if(fstat(fd, &buf)) return(0);                  /* cannot get status */
 129         if(buf.st_size != sizeof(int)) return(0);       /* not an xlock file */
 130         time(&date);
 131         if(date - buf.st_mtime < 3L*24L*60L*60L) {      /* recent */
 132                 int lockedpid;  /* should be the same size as hackpid */
 133
 134                 if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=
 135                         sizeof(lockedpid))
 136                         /* strange ... */
 137                         return(0);
 138
 139                 /* From: Rick Adams <seismo!rick> */
 140                 /* This will work on 4.1cbsd, 4.2bsd and system 3? & 5. */
 141                 /* It will do nothing on V7 or 4.1bsd. */
 142                 if(!(kill(lockedpid, 0) == -1 && errno == ESRCH))
 143                         return(0);
 144         }
 145         close(fd);
 146         for(i = 1; i <= MAXLEVEL; i++) {                /* try to remove all */
 147                 glo(i);
 148                 unlink(lock);
 149         }
 150         glo(0);
 151         if(unlink(lock)) return(0);                     /* cannot remove it */
 152         return(1);                                      /* success! */
 153 }
 154
 155 void
 156 getlock(void)
 157 {
 158         int i = 0, fd;
 159
 160         fflush(stdout);
 161
 162         /* we ignore QUIT and INT at this point */
 163         if (link(HLOCK, LLOCK) == -1) {
 164                 int errnosv = errno;
 165
 166                 perror(HLOCK);
 167                 printf("Cannot link %s to %s\n", LLOCK, HLOCK);
 168                 switch(errnosv) {
 169                 case ENOENT:
 170                     printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
 171                     break;
 172                 case EACCES:
 173                     printf("It seems you don't have write permission here.\n");
 174                     break;
 175                 case EEXIST:
 176                     printf("(Try again or rm %s.)\n", LLOCK);
 177                     break;
 178                 default:
 179                     printf("I don't know what is wrong.");
 180                 }
 181                 getret();
 182                 error("");
 183                 /*NOTREACHED*/
 184         }
 185
 186         regularize(lock);
 187         glo(0);
 188         if(locknum > 25) locknum = 25;
 189
 190         do {
 191                 if(locknum) lock[0] = 'a' + i++;
 192
 193                 if((fd = open(lock, 0)) == -1) {
 194                         if(errno == ENOENT) goto gotlock;    /* no such file */
 195                         perror(lock);
 196                         unlink(LLOCK);
 197                         error("Cannot open %s", lock);
 198                 }
 199
 200                 if(veryold(fd)) /* if true, this closes fd and unlinks lock */
 201                         goto gotlock;
 202                 close(fd);
 203         } while(i < locknum);
 204
 205         unlink(LLOCK);
 206         error(locknum ? "Too many hacks running now."
 207                       : "There is a game in progress under your name.");
 208 gotlock:
 209         fd = creat(lock, FMASK);
 210         if(unlink(LLOCK) == -1)
 211                 error("Cannot unlink %s.", LLOCK);
 212         if(fd == -1) {
 213                 error("cannot creat lock file.");
 214         } else {
 215                 if(write(fd, (char *) &hackpid, sizeof(hackpid))
 216                     != sizeof(hackpid)){
 217                         error("cannot write lock");
 218                 }
 219                 if(close(fd) == -1) {
 220                         error("cannot close lock");
 221                 }
 222         }
 223 }
 224
 225 #ifdef MAIL
 226
 227 /*
 228  * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
 229  * I don't know the details of his implementation.]
 230  * { Later note: he disliked my calling a general mailreader and felt that
 231  *   hack should do the paging itself. But when I get mail, I want to put it
 232  *   in some folder, reply, etc. - it would be unreasonable to put all these
 233  *   functions in hack. }
 234  * The mail daemon '2' is at present not a real monster, but only a visual
 235  * effect. Thus, makemon() is superfluous. This might become otherwise,
 236  * however. The motion of '2' is less restrained than usual: diagonal moves
 237  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
 238  * in a ROOM, even when you are Blind.
 239  * Its path should be longer when you are Telepat-hic and Blind.
 240  *
 241  * Interesting side effects:
 242  *      - You can get rich by sending yourself a lot of mail and selling
 243  *        it to the shopkeeper. Unfortunately mail isn't very valuable.
 244  *      - You might die in case '2' comes along at a critical moment during
 245  *        a fight and delivers a scroll the weight of which causes you to
 246  *        collapse.
 247  *
 248  * Possible extensions:
 249  *      - Open the file MAIL and do fstat instead of stat for efficiency.
 250  *        (But sh uses stat, so this cannot be too bad.)
 251  *      - Examine the mail and produce a scroll of mail called "From somebody".
 252  *      - Invoke MAILREADER in such a way that only this single letter is read.
 253  *
 254  *      - Make him lose his mail when a Nymph steals the letter.
 255  *      - Do something to the text when the scroll is enchanted or cancelled.
 256  */
 257 #include        "def.mkroom.h"
 258 static struct stat omstat,nmstat;
 259 static char *mailbox;
 260 static long laststattime;
 261
 262 void
 263 getmailstatus(void)
 264 {
 265         if(!(mailbox = getenv("MAIL")))
 266                 return;
 267         if(stat(mailbox, &omstat)){
 268 #ifdef PERMANENT_MAILBOX
 269                 pline("Cannot get status of MAIL=%s .", mailbox);
 270                 mailbox = 0;
 271 #else
 272                 omstat.st_mtime = 0;
 273 #endif /* PERMANENT_MAILBOX */
 274         }
 275 }
 276
 277 void
 278 ckmailstatus(void)
 279 {
 280         if(!mailbox
 281 #ifdef MAILCKFREQ
 282                     || moves < laststattime + MAILCKFREQ
 283 #endif /* MAILCKFREQ */
 284                                                         )
 285                 return;
 286         laststattime = moves;
 287         if(stat(mailbox, &nmstat)){
 288 #ifdef PERMANENT_MAILBOX
 289                 pline("Cannot get status of MAIL=%s anymore.", mailbox);
 290                 mailbox = 0;
 291 #else
 292                 nmstat.st_mtime = 0;
 293 #endif /* PERMANENT_MAILBOX */
 294         } else if(nmstat.st_mtime > omstat.st_mtime) {
 295                 if(nmstat.st_size)
 296                         newmail();
 297                 getmailstatus();        /* might be too late ... */
 298         }
 299 }
 300
 301 static void
 302 newmail(void)
 303 {
 304         /* produce a scroll of mail */
 305         struct obj *obj;
 306         struct monst *md;
 307         extern struct permonst pm_mail_daemon;
 308
 309         obj = mksobj(SCR_MAIL);
 310         if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */
 311                 mdrush(md,0);
 312
 313         pline("\"Hello, %s! I have some mail for you.\"", plname);
 314         if(md) {
 315                 if(dist(md->mx,md->my) > 2)
 316                         pline("\"Catch!\"");
 317                 more();
 318
 319                 /* let him disappear again */
 320                 mdrush(md,1);
 321                 mondead(md);
 322         }
 323
 324         obj = addinv(obj);
 325         identify(obj);          /* set known and do prinv() */
 326 }
 327
 328 /* make md run through the cave */
 329 static void
 330 mdrush(struct monst *md, bool away)
 331 {
 332         int uroom = inroom(u.ux, u.uy);
 333         if(uroom >= 0) {
 334                 int tmp = rooms[uroom].fdoor;
 335                 int cnt = rooms[uroom].doorct;
 336                 int fx = u.ux, fy = u.uy;
 337                 while(cnt--) {
 338                         if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){
 339                                 fx = doors[tmp].x;
 340                                 fy = doors[tmp].y;
 341                         }
 342                         tmp++;
 343                 }
 344                 tmp_at(-1, md->data->mlet);     /* open call */
 345                 if(away) {      /* interchange origin and destination */
 346                         unpmon(md);
 347                         tmp = fx; fx = md->mx; md->mx = tmp;
 348                         tmp = fy; fy = md->my; md->my = tmp;
 349                 }
 350                 while(fx != md->mx || fy != md->my) {
 351                         int dx,dy,nfx = fx,nfy = fy,d1,d2;
 352
 353                         tmp_at(fx,fy);
 354                         d1 = DIST(fx,fy,md->mx,md->my);
 355                         for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++)
 356                             if(dx || dy) {
 357                                 d2 = DIST(fx+dx,fy+dy,md->mx,md->my);
 358                                 if(d2 < d1) {
 359                                     d1 = d2;
 360                                     nfx = fx+dx;
 361                                     nfy = fy+dy;
 362                                 }
 363                             }
 364                         if(nfx != fx || nfy != fy) {
 365                             fx = nfx;
 366                             fy = nfy;
 367                         } else {
 368                             if(!away) {
 369                                 md->mx = fx;
 370                                 md->my = fy;
 371                             }
 372                             break;
 373                         }
 374                 }
 375                 tmp_at(-1,-1);                  /* close call */
 376         }
 377         if(!away)
 378                 pmon(md);
 379 }
 380
 381 void
 382 readmail(void)
 383 {
 384 #ifdef DEF_MAILREADER                   /* This implies that UNIX is defined */
 385         char *mr = 0;
 386         more();
 387         if(!(mr = getenv("MAILREADER")))
 388                 mr = DEF_MAILREADER;
 389         if(child(1)){
 390                 execl(mr, mr, NULL);
 391                 exit(1);
 392         }
 393 #else /* DEF_MAILREADER */
 394         page_file(mailbox, FALSE);
 395 #endif /* DEF_MAILREADER */
 396         /* get new stat; not entirely correct: there is a small time
 397            window where we do not see new mail */
 398         getmailstatus();
 399 }
 400 #endif /* MAIL */
 401
 402 void
 403 regularize(char *s)     /* normalize file name - we don't like ..'s or /'s */
 404 {
 405         char *lp;
 406
 407         while((lp = index(s, '.')) || (lp = index(s, '/')))
 408                 *lp = '_';
 409 }