src/rumors.c

   1 /* NetHack 3.6  rumors.c        $NHDT-Date: 1446713640 2015/11/05 08:54:00 $  $NHDT-Branch: master $:$NHDT-Revision: 1.27 $ */
   2 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
   3 /* NetHack may be freely redistributed.  See license for details. */
   4
   5 #include "hack.h"
   6 #include "lev.h"
   7 #include "dlb.h"
   8
   9 /*      [note: this comment is fairly old, but still accurate for 3.1]
  10  * Rumors have been entirely rewritten to speed up the access.  This is
  11  * essential when working from floppies.  Using fseek() the way that's done
  12  * here means rumors following longer rumors are output more often than those
  13  * following shorter rumors.  Also, you may see the same rumor more than once
  14  * in a particular game (although the odds are highly against it), but
  15  * this also happens with real fortune cookies.  -dgk
  16  */
  17
  18 /*      3.6
  19  * The rumors file consists of a "do not edit" line, then a line containing
  20  * three sets of three counts (first two in decimal, third in hexadecimal).
  21  * The first set has the number of true rumors, the count in bytes for all
  22  * true rumors, and the file offset to the first one.  The second set has
  23  * the same group of numbers for the false rumors.  The third set has 0 for
  24  * count, 0 for size, and the file offset for end-of-file.  The offset of
  25  * the first true rumor plus the size of the true rumors matches the offset
  26  * of the first false rumor.  Likewise, the offset of the first false rumor
  27  * plus the size of the false rumors matches the offset for end-of-file.
  28  */
  29
  30 /*      3.1     [now obsolete for rumors but still accurate for oracles]
  31  * The rumors file consists of a "do not edit" line, a hexadecimal number
  32  * giving the number of bytes of useful/true rumors, followed by those
  33  * true rumors (one per line), followed by the useless/false/misleading/cute
  34  * rumors (also one per line).  Number of bytes of untrue rumors is derived
  35  * via fseek(EOF)+ftell().
  36  *
  37  * The oracles file consists of a "do not edit" comment, a decimal count N
  38  * and set of N+1 hexadecimal fseek offsets, followed by N multiple-line
  39  * records, separated by "---" lines.  The first oracle is a special case,
  40  * and placed there by 'makedefs'.
  41  */
  42
  43 STATIC_DCL void FDECL(init_rumors, (dlb *));
  44 STATIC_DCL void FDECL(init_oracles, (dlb *));
  45
  46 /* rumor size variables are signed so that value -1 can be used as a flag */
  47 static long true_rumor_size = 0L, false_rumor_size;
  48 /* rumor start offsets are unsigned because they're handled via %lx format */
  49 static unsigned long true_rumor_start, false_rumor_start;
  50 /* rumor end offsets are signed because they're compared with [dlb_]ftell() */
  51 static long true_rumor_end, false_rumor_end;
  52 /* oracles are handled differently from rumors... */
  53 static int oracle_flg = 0; /* -1=>don't use, 0=>need init, 1=>init done */
  54 static unsigned oracle_cnt = 0;
  55 static unsigned long *oracle_loc = 0;
  56
  57 STATIC_OVL void
  58 init_rumors(fp)
  59 dlb *fp;
  60 {
  61     static const char rumors_header[] = "%d,%ld,%lx;%d,%ld,%lx;0,0,%lx\n";
  62     int true_count, false_count; /* in file but not used here */
  63     unsigned long eof_offset;
  64     char line[BUFSZ];
  65
  66     (void) dlb_fgets(line, sizeof line, fp); /* skip "don't edit" comment */
  67     (void) dlb_fgets(line, sizeof line, fp);
  68     if (sscanf(line, rumors_header, &true_count, &true_rumor_size,
  69                &true_rumor_start, &false_count, &false_rumor_size,
  70                &false_rumor_start, &eof_offset) == 7
  71         && true_rumor_size > 0L
  72         && false_rumor_size > 0L) {
  73         true_rumor_end = (long) true_rumor_start + true_rumor_size;
  74         /* assert( true_rumor_end == false_rumor_start ); */
  75         false_rumor_end = (long) false_rumor_start + false_rumor_size;
  76         /* assert( false_rumor_end == eof_offset ); */
  77     } else {
  78         true_rumor_size = -1L; /* init failed */
  79         (void) dlb_fclose(fp);
  80     }
  81 }
  82
  83 /* exclude_cookie is a hack used because we sometimes want to get rumors in a
  84  * context where messages such as "You swallowed the fortune!" that refer to
  85  * cookies should not appear.  This has no effect for true rumors since none
  86  * of them contain such references anyway.
  87  */
  88 char *
  89 getrumor(truth, rumor_buf, exclude_cookie)
  90 int truth; /* 1=true, -1=false, 0=either */
  91 char *rumor_buf;
  92 boolean exclude_cookie;
  93 {
  94     dlb *rumors;
  95     long tidbit, beginning;
  96     char *endp, line[BUFSZ], xbuf[BUFSZ];
  97
  98     rumor_buf[0] = '\0';
  99     if (true_rumor_size < 0L) /* we couldn't open RUMORFILE */
 100         return rumor_buf;
 101
 102     rumors = dlb_fopen(RUMORFILE, "r");
 103
 104     if (rumors) {
 105         int count = 0;
 106         int adjtruth;
 107
 108         do {
 109             rumor_buf[0] = '\0';
 110             if (true_rumor_size == 0L) { /* if this is 1st outrumor() */
 111                 init_rumors(rumors);
 112                 if (true_rumor_size < 0L) { /* init failed */
 113                     Sprintf(rumor_buf, "Error reading \"%.80s\".", RUMORFILE);
 114                     return rumor_buf;
 115                 }
 116             }
 117             /*
 118              *  input:      1    0   -1
 119              *   rn2 \ +1  2=T  1=T  0=F
 120              *   adj./ +0  1=T  0=F -1=F
 121              */
 122             switch (adjtruth = truth + rn2(2)) {
 123             case 2: /*(might let a bogus input arg sneak thru)*/
 124             case 1:
 125                 beginning = (long) true_rumor_start;
 126                 tidbit = Rand() % true_rumor_size;
 127                 break;
 128             case 0: /* once here, 0 => false rather than "either"*/
 129             case -1:
 130                 beginning = (long) false_rumor_start;
 131                 tidbit = Rand() % false_rumor_size;
 132                 break;
 133             default:
 134                 impossible("strange truth value for rumor");
 135                 return strcpy(rumor_buf, "Oops...");
 136             }
 137             (void) dlb_fseek(rumors, beginning + tidbit, SEEK_SET);
 138             (void) dlb_fgets(line, sizeof line, rumors);
 139             if (!dlb_fgets(line, sizeof line, rumors)
 140                 || (adjtruth > 0 && dlb_ftell(rumors) > true_rumor_end)) {
 141                 /* reached end of rumors -- go back to beginning */
 142                 (void) dlb_fseek(rumors, beginning, SEEK_SET);
 143                 (void) dlb_fgets(line, sizeof line, rumors);
 144             }
 145             if ((endp = index(line, '\n')) != 0)
 146                 *endp = 0;
 147             Strcat(rumor_buf, xcrypt(line, xbuf));
 148         } while (
 149             count++ < 50 && exclude_cookie
 150             && (strstri(rumor_buf, "fortune") || strstri(rumor_buf, "pity")));
 151         (void) dlb_fclose(rumors);
 152         if (count >= 50)
 153             impossible("Can't find non-cookie rumor?");
 154         else if (!in_mklev) /* avoid exercizing wisdom for graffiti */
 155             exercise(A_WIS, (adjtruth > 0));
 156     } else {
 157         pline("Can't open rumors file!");
 158         true_rumor_size = -1; /* don't try to open it again */
 159     }
 160 /* this is safe either way, so do it always since we can't get the definition
 161  * out of makedefs.c
 162  */
 163 #define PAD_RUMORS_TO
 164 #ifdef PAD_RUMORS_TO
 165     /* remove padding */
 166     {
 167         char *x = eos(rumor_buf) - 1;
 168
 169         while (x > rumor_buf && *x == '_')
 170             x--;
 171         *++x = '\n';
 172         *x = '\0';
 173     }
 174 #endif
 175     return rumor_buf;
 176 }
 177
 178 /*
 179  * test that the true/false rumor boundaries are valid.
 180  */
 181 void
 182 rumor_check()
 183 {
 184     dlb *rumors;
 185     winid tmpwin;
 186     char *endp, line[BUFSZ], xbuf[BUFSZ], rumor_buf[BUFSZ];
 187
 188     if (true_rumor_size < 0L) { /* we couldn't open RUMORFILE */
 189     no_rumors:
 190         pline("rumors not accessible.");
 191         return;
 192     }
 193
 194     rumors = dlb_fopen(RUMORFILE, "r");
 195
 196     if (rumors) {
 197         long ftell_rumor_start = 0L;
 198
 199         rumor_buf[0] = '\0';
 200         if (true_rumor_size == 0L) { /* if this is 1st outrumor() */
 201             init_rumors(rumors);
 202             if (true_rumor_size < 0L)
 203                 goto no_rumors; /* init failed */
 204         }
 205         tmpwin = create_nhwindow(NHW_TEXT);
 206
 207         /*
 208          * reveal the values.
 209          */
 210
 211         Sprintf(
 212             rumor_buf,
 213             "T start=%06ld (%06lx), end=%06ld (%06lx), size=%06ld (%06lx)",
 214             (long) true_rumor_start, true_rumor_start, true_rumor_end,
 215             (unsigned long) true_rumor_end, true_rumor_size,
 216             (unsigned long) true_rumor_size);
 217         putstr(tmpwin, 0, rumor_buf);
 218
 219         Sprintf(
 220             rumor_buf,
 221             "F start=%06ld (%06lx), end=%06ld (%06lx), size=%06ld (%06lx)",
 222             (long) false_rumor_start, false_rumor_start, false_rumor_end,
 223             (unsigned long) false_rumor_end, false_rumor_size,
 224             (unsigned long) false_rumor_size);
 225         putstr(tmpwin, 0, rumor_buf);
 226
 227         /*
 228          * check the first rumor (start of true rumors) by
 229          * skipping the first two lines.
 230          *
 231          * Then seek to the start of the false rumors (based on
 232          * the value read in rumors, and display it.
 233          */
 234         rumor_buf[0] = '\0';
 235         (void) dlb_fseek(rumors, (long) true_rumor_start, SEEK_SET);
 236         ftell_rumor_start = dlb_ftell(rumors);
 237         (void) dlb_fgets(line, sizeof line, rumors);
 238         if ((endp = index(line, '\n')) != 0)
 239             *endp = 0;
 240         Sprintf(rumor_buf, "T %06ld %s", ftell_rumor_start,
 241                 xcrypt(line, xbuf));
 242         putstr(tmpwin, 0, rumor_buf);
 243         /* find last true rumor */
 244         while (dlb_fgets(line, sizeof line, rumors)
 245                && dlb_ftell(rumors) < true_rumor_end)
 246             continue;
 247         if ((endp = index(line, '\n')) != 0)
 248             *endp = 0;
 249         Sprintf(rumor_buf, "  %6s %s", "", xcrypt(line, xbuf));
 250         putstr(tmpwin, 0, rumor_buf);
 251
 252         rumor_buf[0] = '\0';
 253         (void) dlb_fseek(rumors, (long) false_rumor_start, SEEK_SET);
 254         ftell_rumor_start = dlb_ftell(rumors);
 255         (void) dlb_fgets(line, sizeof line, rumors);
 256         if ((endp = index(line, '\n')) != 0)
 257             *endp = 0;
 258         Sprintf(rumor_buf, "F %06ld %s", ftell_rumor_start,
 259                 xcrypt(line, xbuf));
 260         putstr(tmpwin, 0, rumor_buf);
 261         /* find last false rumor */
 262         while (dlb_fgets(line, sizeof line, rumors)
 263                && dlb_ftell(rumors) < false_rumor_end)
 264             continue;
 265         if ((endp = index(line, '\n')) != 0)
 266             *endp = 0;
 267         Sprintf(rumor_buf, "  %6s %s", "", xcrypt(line, xbuf));
 268         putstr(tmpwin, 0, rumor_buf);
 269
 270         (void) dlb_fclose(rumors);
 271         display_nhwindow(tmpwin, TRUE);
 272         destroy_nhwindow(tmpwin);
 273     } else {
 274         impossible("Can't open rumors file!");
 275         true_rumor_size = -1; /* don't try to open it again */
 276     }
 277 }
 278
 279 /* Gets a random line of text from file 'fname', and returns it. */
 280 char *
 281 get_rnd_text(fname, buf)
 282 const char *fname;
 283 char *buf;
 284 {
 285     dlb *fh;
 286
 287     buf[0] = '\0';
 288
 289     fh = dlb_fopen(fname, "r");
 290
 291     if (fh) {
 292         /* TODO: cache sizetxt, starttxt, endtxt. maybe cache file contents?
 293          */
 294         long sizetxt = 0, starttxt = 0, endtxt = 0, tidbit = 0;
 295         char *endp, line[BUFSZ], xbuf[BUFSZ];
 296         (void) dlb_fgets(line, sizeof line,
 297                          fh); /* skip "don't edit" comment */
 298
 299         (void) dlb_fseek(fh, 0L, SEEK_CUR);
 300         starttxt = dlb_ftell(fh);
 301         (void) dlb_fseek(fh, 0L, SEEK_END);
 302         endtxt = dlb_ftell(fh);
 303         sizetxt = endtxt - starttxt;
 304         tidbit = Rand() % sizetxt;
 305
 306         (void) dlb_fseek(fh, starttxt + tidbit, SEEK_SET);
 307         (void) dlb_fgets(line, sizeof line, fh);
 308         if (!dlb_fgets(line, sizeof line, fh)) {
 309             (void) dlb_fseek(fh, starttxt, SEEK_SET);
 310             (void) dlb_fgets(line, sizeof line, fh);
 311         }
 312         if ((endp = index(line, '\n')) != 0)
 313             *endp = 0;
 314         Strcat(buf, xcrypt(line, xbuf));
 315         (void) dlb_fclose(fh);
 316     } else
 317         impossible("Can't open file %s!", fname);
 318     return buf;
 319 }
 320
 321 void
 322 outrumor(truth, mechanism)
 323 int truth; /* 1=true, -1=false, 0=either */
 324 int mechanism;
 325 {
 326     static const char fortune_msg[] =
 327         "This cookie has a scrap of paper inside.";
 328     const char *line;
 329     char buf[BUFSZ];
 330     boolean reading = (mechanism == BY_COOKIE || mechanism == BY_PAPER);
 331
 332     if (reading) {
 333         /* deal with various things that prevent reading */
 334         if (is_fainted() && mechanism == BY_COOKIE)
 335             return;
 336         else if (Blind) {
 337             if (mechanism == BY_COOKIE)
 338                 pline(fortune_msg);
 339             pline("What a pity that you cannot read it!");
 340             return;
 341         }
 342     }
 343     line = getrumor(truth, buf, reading ? FALSE : TRUE);
 344     if (!*line)
 345         line = "NetHack rumors file closed for renovation.";
 346     switch (mechanism) {
 347     case BY_ORACLE:
 348         /* Oracle delivers the rumor */
 349         pline("True to her word, the Oracle %ssays: ",
 350               (!rn2(4) ? "offhandedly "
 351                        : (!rn2(3) ? "casually "
 352                                   : (rn2(2) ? "nonchalantly " : ""))));
 353         verbalize1(line);
 354         /* [WIS exercized by getrumor()] */
 355         return;
 356     case BY_COOKIE:
 357         pline(fortune_msg);
 358     /* FALLTHRU */
 359     case BY_PAPER:
 360         pline("It reads:");
 361         break;
 362     }
 363     pline1(line);
 364 }
 365
 366 STATIC_OVL void
 367 init_oracles(fp)
 368 dlb *fp;
 369 {
 370     register int i;
 371     char line[BUFSZ];
 372     int cnt = 0;
 373
 374     /* this assumes we're only called once */
 375     (void) dlb_fgets(line, sizeof line, fp); /* skip "don't edit" comment*/
 376     (void) dlb_fgets(line, sizeof line, fp);
 377     if (sscanf(line, "%5d\n", &cnt) == 1 && cnt > 0) {
 378         oracle_cnt = (unsigned) cnt;
 379         oracle_loc = (unsigned long *) alloc((unsigned) cnt * sizeof(long));
 380         for (i = 0; i < cnt; i++) {
 381             (void) dlb_fgets(line, sizeof line, fp);
 382             (void) sscanf(line, "%5lx\n", &oracle_loc[i]);
 383         }
 384     }
 385     return;
 386 }
 387
 388 void
 389 save_oracles(fd, mode)
 390 int fd, mode;
 391 {
 392     if (perform_bwrite(mode)) {
 393         bwrite(fd, (genericptr_t) &oracle_cnt, sizeof oracle_cnt);
 394         if (oracle_cnt)
 395             bwrite(fd, (genericptr_t) oracle_loc, oracle_cnt * sizeof(long));
 396     }
 397     if (release_data(mode)) {
 398         if (oracle_cnt) {
 399             free((genericptr_t) oracle_loc);
 400             oracle_loc = 0, oracle_cnt = 0, oracle_flg = 0;
 401         }
 402     }
 403 }
 404
 405 void
 406 restore_oracles(fd)
 407 int fd;
 408 {
 409     mread(fd, (genericptr_t) &oracle_cnt, sizeof oracle_cnt);
 410     if (oracle_cnt) {
 411         oracle_loc = (unsigned long *) alloc(oracle_cnt * sizeof(long));
 412         mread(fd, (genericptr_t) oracle_loc, oracle_cnt * sizeof(long));
 413         oracle_flg = 1; /* no need to call init_oracles() */
 414     }
 415 }
 416
 417 void
 418 outoracle(special, delphi)
 419 boolean special;
 420 boolean delphi;
 421 {
 422     char line[COLNO];
 423     char *endp;
 424     dlb *oracles;
 425     int oracle_idx;
 426     char xbuf[BUFSZ];
 427
 428     /* early return if we couldn't open ORACLEFILE on previous attempt,
 429        or if all the oracularities are already exhausted */
 430     if (oracle_flg < 0 || (oracle_flg > 0 && oracle_cnt == 0))
 431         return;
 432
 433     oracles = dlb_fopen(ORACLEFILE, "r");
 434
 435     if (oracles) {
 436         winid tmpwin;
 437         if (oracle_flg == 0) { /* if this is the first outoracle() */
 438             init_oracles(oracles);
 439             oracle_flg = 1;
 440             if (oracle_cnt == 0)
 441                 return;
 442         }
 443         /* oracle_loc[0] is the special oracle;
 444            oracle_loc[1..oracle_cnt-1] are normal ones */
 445         if (oracle_cnt <= 1 && !special)
 446             return; /*(shouldn't happen)*/
 447         oracle_idx = special ? 0 : rnd((int) oracle_cnt - 1);
 448         (void) dlb_fseek(oracles, (long) oracle_loc[oracle_idx], SEEK_SET);
 449         if (!special) /* move offset of very last one into this slot */
 450             oracle_loc[oracle_idx] = oracle_loc[--oracle_cnt];
 451
 452         tmpwin = create_nhwindow(NHW_TEXT);
 453         if (delphi)
 454             putstr(tmpwin, 0,
 455                    special
 456                      ? "The Oracle scornfully takes all your money and says:"
 457                      : "The Oracle meditates for a moment and then intones:");
 458         else
 459             putstr(tmpwin, 0, "The message reads:");
 460         putstr(tmpwin, 0, "");
 461
 462         while (dlb_fgets(line, COLNO, oracles) && strcmp(line, "---\n")) {
 463             if ((endp = index(line, '\n')) != 0)
 464                 *endp = 0;
 465             putstr(tmpwin, 0, xcrypt(line, xbuf));
 466         }
 467         display_nhwindow(tmpwin, TRUE);
 468         destroy_nhwindow(tmpwin);
 469         (void) dlb_fclose(oracles);
 470     } else {
 471         pline("Can't open oracles file!");
 472         oracle_flg = -1; /* don't try to open it again */
 473     }
 474 }
 475
 476 int
 477 doconsult(oracl)
 478 struct monst *oracl;
 479 {
 480     long umoney;
 481     int u_pay, minor_cost = 50, major_cost = 500 + 50 * u.ulevel;
 482     int add_xpts;
 483     char qbuf[QBUFSZ];
 484
 485     multi = 0;
 486     umoney = money_cnt(invent);
 487
 488     if (!oracl) {
 489         There("is no one here to consult.");
 490         return 0;
 491     } else if (!oracl->mpeaceful) {
 492         pline("%s is in no mood for consultations.", Monnam(oracl));
 493         return 0;
 494     } else if (!umoney) {
 495         You("have no money.");
 496         return 0;
 497     }
 498
 499     Sprintf(qbuf, "\"Wilt thou settle for a minor consultation?\" (%d %s)",
 500             minor_cost, currency((long) minor_cost));
 501     switch (ynq(qbuf)) {
 502     default:
 503     case 'q':
 504         return 0;
 505     case 'y':
 506         if (umoney < (long) minor_cost) {
 507             You("don't even have enough money for that!");
 508             return 0;
 509         }
 510         u_pay = minor_cost;
 511         break;
 512     case 'n':
 513         if (umoney <= (long) minor_cost /* don't even ask */
 514             || (oracle_cnt == 1 || oracle_flg < 0))
 515             return 0;
 516         Sprintf(qbuf, "\"Then dost thou desire a major one?\" (%d %s)",
 517                 major_cost, currency((long) major_cost));
 518         if (yn(qbuf) != 'y')
 519             return 0;
 520         u_pay = (umoney < (long) major_cost) ? (int) umoney : major_cost;
 521         break;
 522     }
 523     money2mon(oracl, (long) u_pay);
 524     context.botl = 1;
 525     add_xpts = 0; /* first oracle of each type gives experience points */
 526     if (u_pay == minor_cost) {
 527         outrumor(1, BY_ORACLE);
 528         if (!u.uevent.minor_oracle)
 529             add_xpts = u_pay / (u.uevent.major_oracle ? 25 : 10);
 530         /* 5 pts if very 1st, or 2 pts if major already done */
 531         u.uevent.minor_oracle = TRUE;
 532     } else {
 533         boolean cheapskate = u_pay < major_cost;
 534
 535         outoracle(cheapskate, TRUE);
 536         if (!cheapskate && !u.uevent.major_oracle)
 537             add_xpts = u_pay / (u.uevent.minor_oracle ? 25 : 10);
 538         /* ~100 pts if very 1st, ~40 pts if minor already done */
 539         u.uevent.major_oracle = TRUE;
 540         exercise(A_WIS, !cheapskate);
 541     }
 542     if (add_xpts) {
 543         more_experienced(add_xpts, u_pay / 50);
 544         newexplevel();
 545     }
 546     return 1;
 547 }
 548
 549 /*rumors.c*/