games/hack/hack.zap.c

   1 /*      $NetBSD: hack.zap.c,v 1.9 2009/08/12 07:28:41 dholland Exp $    */
   2
   3 /*
   4  * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
   5  * Amsterdam
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are
  10  * met:
  11  *
  12  * - Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * - Redistributions in binary form must reproduce the above copyright
  16  * notice, this list of conditions and the following disclaimer in the
  17  * documentation and/or other materials provided with the distribution.
  18  *
  19  * - Neither the name of the Stichting Centrum voor Wiskunde en
  20  * Informatica, nor the names of its contributors may be used to endorse or
  21  * promote products derived from this software without specific prior
  22  * written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  25  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  26  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  27  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  28  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  30  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  31  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 /*
  38  * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
  39  * All rights reserved.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. The name of the author may not be used to endorse or promote products
  50  *    derived from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  53  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  54  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  55  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  56  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  57  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  58  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  59  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  60  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  61  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  */
  63
  64 #include "hack.h"
  65 #include "extern.h"
  66
  67 static const char *const fl[] = {
  68         "magic missile",
  69         "bolt of fire",
  70         "sleep ray",
  71         "bolt of cold",
  72         "death ray"
  73 };
  74
  75 static void bhitm(struct monst *, struct obj *);
  76 static int bhito(struct obj *, struct obj *);
  77 static char dirlet(int, int);
  78 static int zhit(struct monst *, int);
  79 static int revive(struct obj *);
  80 static void rloco(struct obj *);
  81 static void burn_scrolls(void);
  82
  83 /* Routines for IMMEDIATE wands. */
  84 /* bhitm: monster mtmp was hit by the effect of wand otmp */
  85 static void
  86 bhitm(struct monst *mtmp, struct obj *otmp)
  87 {
  88         wakeup(mtmp);
  89         switch (otmp->otyp) {
  90         case WAN_STRIKING:
  91                 if (u.uswallow || rnd(20) < 10 + mtmp->data->ac) {
  92                         int             tmp = d(2, 12);
  93                         hit("wand", mtmp, exclam(tmp));
  94                         mtmp->mhp -= tmp;
  95                         if (mtmp->mhp < 1)
  96                                 killed(mtmp);
  97                 } else
  98                         miss("wand", mtmp);
  99                 break;
 100         case WAN_SLOW_MONSTER:
 101                 mtmp->mspeed = MSLOW;
 102                 break;
 103         case WAN_SPEED_MONSTER:
 104                 mtmp->mspeed = MFAST;
 105                 break;
 106         case WAN_UNDEAD_TURNING:
 107                 if (strchr(UNDEAD, mtmp->data->mlet)) {
 108                         mtmp->mhp -= rnd(8);
 109                         if (mtmp->mhp < 1)
 110                                 killed(mtmp);
 111                         else
 112                                 mtmp->mflee = 1;
 113                 }
 114                 break;
 115         case WAN_POLYMORPH:
 116                 if (newcham(mtmp, &mons[rn2(CMNUM)]))
 117                         objects[otmp->otyp].oc_name_known = 1;
 118                 break;
 119         case WAN_CANCELLATION:
 120                 mtmp->mcan = 1;
 121                 break;
 122         case WAN_TELEPORTATION:
 123                 rloc(mtmp);
 124                 break;
 125         case WAN_MAKE_INVISIBLE:
 126                 mtmp->minvis = 1;
 127                 break;
 128 #ifdef WAN_PROBING
 129         case WAN_PROBING:
 130                 mstatusline(mtmp);
 131                 break;
 132 #endif  /* WAN_PROBING */
 133         default:
 134                 impossible("What an interesting wand (%u)", otmp->otyp);
 135         }
 136 }
 137
 138 /*
 139  * object obj was hit by the effect of wand otmp
 140  * returns TRUE if sth was done
 141  */
 142 static int
 143 bhito(struct obj *obj, struct obj *otmp)
 144 {
 145         int             res = TRUE;
 146
 147         if (obj == uball || obj == uchain)
 148                 res = FALSE;
 149         else
 150                 switch (otmp->otyp) {
 151                 case WAN_POLYMORPH:
 152                         /*
 153                          * preserve symbol and quantity, but turn rocks into
 154                          * gems
 155                          */
 156                         mkobj_at((obj->otyp == ROCK || obj->otyp == ENORMOUS_ROCK)
 157                                  ? GEM_SYM : obj->olet,
 158                                  obj->ox, obj->oy)->quan = obj->quan;
 159                         delobj(obj);
 160                         break;
 161                 case WAN_STRIKING:
 162                         if (obj->otyp == ENORMOUS_ROCK)
 163                                 fracture_rock(obj);
 164                         else
 165                                 res = FALSE;
 166                         break;
 167                 case WAN_CANCELLATION:
 168                         if (obj->spe && obj->olet != AMULET_SYM) {
 169                                 obj->known = 0;
 170                                 obj->spe = 0;
 171                         }
 172                         break;
 173                 case WAN_TELEPORTATION:
 174                         rloco(obj);
 175                         break;
 176                 case WAN_MAKE_INVISIBLE:
 177                         obj->oinvis = 1;
 178                         break;
 179                 case WAN_UNDEAD_TURNING:
 180                         res = revive(obj);
 181                         break;
 182                 case WAN_SLOW_MONSTER:  /* no effect on objects */
 183                 case WAN_SPEED_MONSTER:
 184 #ifdef WAN_PROBING
 185                 case WAN_PROBING:
 186 #endif  /* WAN_PROBING */
 187                         res = FALSE;
 188                         break;
 189                 default:
 190                         impossible("What an interesting wand (%u)", otmp->otyp);
 191                 }
 192         return (res);
 193 }
 194
 195 int
 196 dozap(void)
 197 {
 198         struct obj     *obj;
 199         xchar           zx, zy;
 200
 201         obj = getobj("/", "zap");
 202         if (!obj)
 203                 return (0);
 204         if (obj->spe < 0 || (obj->spe == 0 && rn2(121))) {
 205                 pline("Nothing Happens.");
 206                 return (1);
 207         }
 208         if (obj->spe == 0)
 209                 pline("You wrest one more spell from the worn-out wand.");
 210         if (!(objects[obj->otyp].bits & NODIR) && !getdir(1))
 211                 return (1);     /* make him pay for knowing !NODIR */
 212         obj->spe--;
 213         if (objects[obj->otyp].bits & IMMEDIATE) {
 214                 if (u.uswallow)
 215                         bhitm(u.ustuck, obj);
 216                 else if (u.dz) {
 217                         if (u.dz > 0) {
 218                                 struct obj     *otmp = o_at(u.ux, u.uy);
 219                                 if (otmp)
 220                                         (void) bhito(otmp, obj);
 221                         }
 222                 } else
 223                         (void) bhit(u.dx, u.dy, rn1(8, 6), 0, bhitm, bhito, obj);
 224         } else {
 225                 switch (obj->otyp) {
 226                 case WAN_LIGHT:
 227                         litroom(TRUE);
 228                         break;
 229                 case WAN_SECRET_DOOR_DETECTION:
 230                         if (!findit())
 231                                 return (1);
 232                         break;
 233                 case WAN_CREATE_MONSTER:
 234                         {
 235                                 int             cnt = 1;
 236                                 if (!rn2(23))
 237                                         cnt += rn2(7) + 1;
 238                                 while (cnt--)
 239                                         (void) makemon((struct permonst *) 0, u.ux, u.uy);
 240                         }
 241                         break;
 242                 case WAN_WISHING:
 243                         {
 244                                 char            buf[BUFSZ];
 245                                 struct obj     *otmp;
 246                                 if (u.uluck + rn2(5) < 0) {
 247                                         pline("Unfortunately, nothing happens.");
 248                                         break;
 249                                 }
 250                                 pline("You may wish for an object. What do you want? ");
 251                                 getlin(buf);
 252                                 if (buf[0] == '\033')
 253                                         buf[0] = 0;
 254                                 otmp = readobjnam(buf);
 255                                 otmp = addinv(otmp);
 256                                 prinv(otmp);
 257                                 break;
 258                         }
 259                 case WAN_DIGGING:
 260                         /*
 261                          * Original effect (approximately): from CORR: dig
 262                          * until we pierce a wall from ROOM: piece wall and
 263                          * dig until we reach an ACCESSIBLE place. Currently:
 264                          * dig for digdepth positions; also down on request
 265                          * of Lennart Augustsson.
 266                          */
 267                         {
 268                                 struct rm      *room;
 269                                 int             digdepth;
 270                                 if (u.uswallow) {
 271                                         struct monst   *mtmp = u.ustuck;
 272
 273                                         pline("You pierce %s's stomach wall!",
 274                                               monnam(mtmp));
 275                                         mtmp->mhp = 1;  /* almost dead */
 276                                         unstuck(mtmp);
 277                                         mnexto(mtmp);
 278                                         break;
 279                                 }
 280                                 if (u.dz) {
 281                                         if (u.dz < 0) {
 282                                                 pline("You loosen a rock from the ceiling.");
 283                                                 pline("It falls on your head!");
 284                                                 losehp(1, "falling rock");
 285                                                 mksobj_at(ROCK, u.ux, u.uy);
 286                                                 fobj->quan = 1;
 287                                                 stackobj(fobj);
 288                                                 if (Invisible)
 289                                                         newsym(u.ux, u.uy);
 290                                         } else {
 291                                                 dighole();
 292                                         }
 293                                         break;
 294                                 }
 295                                 zx = u.ux + u.dx;
 296                                 zy = u.uy + u.dy;
 297                                 digdepth = 8 + rn2(18);
 298                                 Tmp_at(-1, '*');        /* open call */
 299                                 while (--digdepth >= 0) {
 300                                         if (!isok(zx, zy))
 301                                                 break;
 302                                         room = &levl[zx][zy];
 303                                         Tmp_at(zx, zy);
 304                                         if (!xdnstair) {
 305                                                 if (zx < 3 || zx > COLNO - 3 ||
 306                                                     zy < 3 || zy > ROWNO - 3)
 307                                                         break;
 308                                                 if (room->typ == HWALL ||
 309                                                     room->typ == VWALL) {
 310                                                         room->typ = ROOM;
 311                                                         break;
 312                                                 }
 313                                         } else if (room->typ == HWALL || room->typ == VWALL ||
 314                                                    room->typ == SDOOR || room->typ == LDOOR) {
 315                                                 room->typ = DOOR;
 316                                                 digdepth -= 2;
 317                                         } else if (room->typ == SCORR || !room->typ) {
 318                                                 room->typ = CORR;
 319                                                 digdepth--;
 320                                         }
 321                                         mnewsym(zx, zy);
 322                                         zx += u.dx;
 323                                         zy += u.dy;
 324                                 }
 325                                 mnewsym(zx, zy);        /* not always necessary */
 326                                 Tmp_at(-1, -1); /* closing call */
 327                                 break;
 328                         }
 329                 default:
 330                         buzz((int) obj->otyp - WAN_MAGIC_MISSILE,
 331                              u.ux, u.uy, u.dx, u.dy);
 332                         break;
 333                 }
 334                 if (!objects[obj->otyp].oc_name_known) {
 335                         objects[obj->otyp].oc_name_known = 1;
 336                         more_experienced(0, 10);
 337                 }
 338         }
 339         return (1);
 340 }
 341
 342 const char           *
 343 exclam(int force)
 344 {
 345         /* force == 0 occurs e.g. with sleep ray */
 346         /*
 347          * note that large force is usual with wands so that !! would require
 348          * information about hand/weapon/wand
 349          */
 350         return ((force < 0) ? "?" : (force <= 4) ? "." : "!");
 351 }
 352
 353 void
 354 hit(const char *str, struct monst *mtmp, const char *force)
 355 {
 356         /* force is usually either "." or "!" */
 357
 358         if (!cansee(mtmp->mx, mtmp->my))
 359                 pline("The %s hits it.", str);
 360         else
 361                 pline("The %s hits %s%s", str, monnam(mtmp), force);
 362 }
 363
 364 void
 365 miss(const char *str, struct monst *mtmp)
 366 {
 367         if (!cansee(mtmp->mx, mtmp->my))
 368                 pline("The %s misses it.", str);
 369         else
 370                 pline("The %s misses %s.", str, monnam(mtmp));
 371 }
 372
 373 /*
 374  * bhit: called when a weapon is thrown (sym = obj->olet) or when an
 375  * IMMEDIATE wand is zapped (sym = 0); the weapon falls down at end of range
 376  * or when a monster is hit; the monster is returned, and bhitpos is set to
 377  * the final position of the weapon thrown; the ray of a wand may affect
 378  * several objects and monsters on its path - for each of these an argument
 379  * function is called.
 380  */
 381 /* check !u.uswallow before calling bhit() */
 382
 383 struct monst   *
 384 bhit(int ddx, int ddy, int range,       /* direction and range */
 385      int sym,                           /* symbol displayed on path */
 386                                         /* fns called when mon/obj hit */
 387      void (*fhitm)(struct monst *, struct obj *),
 388      int (*fhito)(struct obj *, struct obj *),
 389      struct obj *obj)                   /* 2nd arg to fhitm/fhito */
 390 {
 391         struct monst   *mtmp;
 392         struct obj     *otmp;
 393         int             typ;
 394
 395         bhitpos.x = u.ux;
 396         bhitpos.y = u.uy;
 397
 398         if (sym)
 399                 tmp_at(-1, sym);/* open call */
 400         while (range-- > 0) {
 401                 bhitpos.x += ddx;
 402                 bhitpos.y += ddy;
 403                 typ = levl[bhitpos.x][bhitpos.y].typ;
 404                 if ((mtmp = m_at(bhitpos.x, bhitpos.y)) != NULL) {
 405                         if (sym) {
 406                                 tmp_at(-1, -1); /* close call */
 407                                 return (mtmp);
 408                         }
 409                         (*fhitm) (mtmp, obj);
 410                         range -= 3;
 411                 }
 412                 if (fhito && (otmp = o_at(bhitpos.x, bhitpos.y))) {
 413                         if ((*fhito) (otmp, obj))
 414                                 range--;
 415                 }
 416                 if (!ZAP_POS(typ)) {
 417                         bhitpos.x -= ddx;
 418                         bhitpos.y -= ddy;
 419                         break;
 420                 }
 421                 if (sym)
 422                         tmp_at(bhitpos.x, bhitpos.y);
 423         }
 424
 425         /* leave last symbol unless in a pool */
 426         if (sym)
 427                 tmp_at(-1, (levl[bhitpos.x][bhitpos.y].typ == POOL) ? -1 : 0);
 428         return (0);
 429 }
 430
 431 struct monst   *
 432 boomhit(int dx, int dy)
 433 {
 434         int             i, ct;
 435         struct monst   *mtmp;
 436         char            sym = ')';
 437
 438         bhitpos.x = u.ux;
 439         bhitpos.y = u.uy;
 440
 441         for (i = 0; i < 8; i++)
 442                 if (xdir[i] == dx && ydir[i] == dy)
 443                         break;
 444         tmp_at(-1, sym);        /* open call */
 445         for (ct = 0; ct < 10; ct++) {
 446                 if (i == 8)
 447                         i = 0;
 448                 sym = ')' + '(' - sym;
 449                 tmp_at(-2, sym);/* change let call */
 450                 dx = xdir[i];
 451                 dy = ydir[i];
 452                 bhitpos.x += dx;
 453                 bhitpos.y += dy;
 454                 if ((mtmp = m_at(bhitpos.x, bhitpos.y)) != NULL) {
 455                         tmp_at(-1, -1);
 456                         return (mtmp);
 457                 }
 458                 if (!ZAP_POS(levl[bhitpos.x][bhitpos.y].typ)) {
 459                         bhitpos.x -= dx;
 460                         bhitpos.y -= dy;
 461                         break;
 462                 }
 463                 if (bhitpos.x == u.ux && bhitpos.y == u.uy) {   /* ct == 9 */
 464                         if (rn2(20) >= 10 + u.ulevel) { /* we hit ourselves */
 465                                 (void) thitu(10, rnd(10), "boomerang");
 466                                 break;
 467                         } else {/* we catch it */
 468                                 tmp_at(-1, -1);
 469                                 pline("Skillfully, you catch the boomerang.");
 470                                 return (&youmonst);
 471                         }
 472                 }
 473                 tmp_at(bhitpos.x, bhitpos.y);
 474                 if (ct % 5 != 0)
 475                         i++;
 476         }
 477         tmp_at(-1, -1);         /* do not leave last symbol */
 478         return (0);
 479 }
 480
 481 static char
 482 dirlet(int dx, int dy)
 483 {
 484         return
 485                 (dx == dy) ? '\\' : (dx && dy) ? '/' : dx ? '-' : '|';
 486 }
 487
 488 /* type == -1: monster spitting fire at you */
 489 /* type == -1,-2,-3: bolts sent out by wizard */
 490 /* called with dx = dy = 0 with vertical bolts */
 491 void
 492 buzz(int type, xchar sx, xchar sy, int dx, int dy)
 493 {
 494         int             abstype = abs(type);
 495         const char     *fltxt = (type == -1) ? "blaze of fire" : fl[abstype];
 496         struct rm      *lev;
 497         xchar           range;
 498         struct monst   *mon;
 499
 500         if (u.uswallow) {
 501                 int             tmp;
 502
 503                 if (type < 0)
 504                         return;
 505                 tmp = zhit(u.ustuck, type);
 506                 pline("The %s rips into %s%s",
 507                       fltxt, monnam(u.ustuck), exclam(tmp));
 508                 return;
 509         }
 510         if (type < 0)
 511                 pru();
 512         range = rn1(7, 7);
 513         Tmp_at(-1, dirlet(dx, dy));     /* open call */
 514         while (range-- > 0) {
 515                 sx += dx;
 516                 sy += dy;
 517                 if ((lev = &levl[sx][sy])->typ)
 518                         Tmp_at(sx, sy);
 519                 else {
 520                         int             bounce = 0;
 521                         if (cansee(sx - dx, sy - dy))
 522                                 pline("The %s bounces!", fltxt);
 523                         if (ZAP_POS(levl[sx][sy - dy].typ))
 524                                 bounce = 1;
 525                         if (ZAP_POS(levl[sx - dx][sy].typ)) {
 526                                 if (!bounce || rn2(2))
 527                                         bounce = 2;
 528                         }
 529                         switch (bounce) {
 530                         case 0:
 531                                 dx = -dx;
 532                                 dy = -dy;
 533                                 continue;
 534                         case 1:
 535                                 dy = -dy;
 536                                 sx -= dx;
 537                                 break;
 538                         case 2:
 539                                 dx = -dx;
 540                                 sy -= dy;
 541                                 break;
 542                         }
 543                         Tmp_at(-2, dirlet(dx, dy));
 544                         continue;
 545                 }
 546                 if (lev->typ == POOL && abstype == 1 /* fire */ ) {
 547                         range -= 3;
 548                         lev->typ = ROOM;
 549                         if (cansee(sx, sy)) {
 550                                 mnewsym(sx, sy);
 551                                 pline("The water evaporates.");
 552                         } else
 553                                 pline("You hear a hissing sound.");
 554                 }
 555                 if ((mon = m_at(sx, sy)) &&
 556                     (type != -1 || mon->data->mlet != 'D')) {
 557                         wakeup(mon);
 558                         if (rnd(20) < 18 + mon->data->ac) {
 559                                 int             tmp = zhit(mon, abstype);
 560                                 if (mon->mhp < 1) {
 561                                         if (type < 0) {
 562                                                 if (cansee(mon->mx, mon->my))
 563                                                         pline("%s is killed by the %s!",
 564                                                         Monnam(mon), fltxt);
 565                                                 mondied(mon);
 566                                         } else
 567                                                 killed(mon);
 568                                 } else
 569                                         hit(fltxt, mon, exclam(tmp));
 570                                 range -= 2;
 571                         } else
 572                                 miss(fltxt, mon);
 573                 } else if (sx == u.ux && sy == u.uy) {
 574                         nomul(0);
 575                         if (rnd(20) < 18 + u.uac) {
 576                                 int             dam = 0;
 577                                 range -= 2;
 578                                 pline("The %s hits you!", fltxt);
 579                                 switch (abstype) {
 580                                 case 0:
 581                                         dam = d(2, 6);
 582                                         break;
 583                                 case 1:
 584                                         if (Fire_resistance)
 585                                                 pline("You don't feel hot!");
 586                                         else
 587                                                 dam = d(6, 6);
 588                                         if (!rn2(3))
 589                                                 burn_scrolls();
 590                                         break;
 591                                 case 2:
 592                                         nomul(-rnd(25));        /* sleep ray */
 593                                         break;
 594                                 case 3:
 595                                         if (Cold_resistance)
 596                                                 pline("You don't feel cold!");
 597                                         else
 598                                                 dam = d(6, 6);
 599                                         break;
 600                                 case 4:
 601                                         u.uhp = -1;
 602                                 }
 603                                 losehp(dam, fltxt);
 604                         } else
 605                                 pline("The %s whizzes by you!", fltxt);
 606                         stop_occupation();
 607                 }
 608                 if (!ZAP_POS(lev->typ)) {
 609                         int             bounce = 0, rmn;
 610                         if (cansee(sx, sy))
 611                                 pline("The %s bounces!", fltxt);
 612                         range--;
 613                         if (!dx || !dy || !rn2(20)) {
 614                                 dx = -dx;
 615                                 dy = -dy;
 616                         } else {
 617                                 if (ZAP_POS(rmn = levl[sx][sy - dy].typ) &&
 618                                     (IS_ROOM(rmn) || ZAP_POS(levl[sx + dx][sy - dy].typ)))
 619                                         bounce = 1;
 620                                 if (ZAP_POS(rmn = levl[sx - dx][sy].typ) &&
 621                                     (IS_ROOM(rmn) || ZAP_POS(levl[sx - dx][sy + dy].typ)))
 622                                         if (!bounce || rn2(2))
 623                                                 bounce = 2;
 624
 625                                 switch (bounce) {
 626                                 case 0:
 627                                         dy = -dy;
 628                                         dx = -dx;
 629                                         break;
 630                                 case 1:
 631                                         dy = -dy;
 632                                         break;
 633                                 case 2:
 634                                         dx = -dx;
 635                                         break;
 636                                 }
 637                                 Tmp_at(-2, dirlet(dx, dy));
 638                         }
 639                 }
 640         }
 641         Tmp_at(-1, -1);
 642 }
 643
 644 static int
 645 zhit(struct monst *mon, int type)               /* returns damage to mon */
 646 {
 647         int             tmp = 0;
 648
 649         switch (type) {
 650         case 0:         /* magic missile */
 651                 tmp = d(2, 6);
 652                 break;
 653         case -1:                /* Dragon blazing fire */
 654         case 1:         /* fire */
 655                 if (strchr("Dg", mon->data->mlet))
 656                         break;
 657                 tmp = d(6, 6);
 658                 if (strchr("YF", mon->data->mlet))
 659                         tmp += 7;
 660                 break;
 661         case 2:         /* sleep */
 662                 mon->mfroz = 1;
 663                 break;
 664         case 3:         /* cold */
 665                 if (strchr("YFgf", mon->data->mlet))
 666                         break;
 667                 tmp = d(6, 6);
 668                 if (mon->data->mlet == 'D')
 669                         tmp += 7;
 670                 break;
 671         case 4:         /* death */
 672                 if (strchr(UNDEAD, mon->data->mlet))
 673                         break;
 674                 tmp = mon->mhp + 1;
 675                 break;
 676         }
 677         mon->mhp -= tmp;
 678         return (tmp);
 679 }
 680
 681 #define CORPSE_I_TO_C(otyp)     (char) ((otyp >= DEAD_ACID_BLOB)\
 682                      ?  'a' + (otyp - DEAD_ACID_BLOB)\
 683                      :  '@' + (otyp - DEAD_HUMAN))
 684 static int
 685 revive(struct obj *obj)
 686 {
 687         struct monst   *mtmp = NULL;
 688
 689         if (obj->olet == FOOD_SYM && obj->otyp > CORPSE) {
 690                 /* do not (yet) revive shopkeepers */
 691                 /*
 692                  * Note: this might conceivably produce two monsters at the
 693                  * same position - strange, but harmless
 694                  */
 695                 mtmp = mkmon_at(CORPSE_I_TO_C(obj->otyp), obj->ox, obj->oy);
 696                 delobj(obj);
 697         }
 698         return (!!mtmp);        /* TRUE if some monster created */
 699 }
 700
 701 static void
 702 rloco(struct obj *obj)
 703 {
 704         int tx, ty, otx, oty;
 705
 706         otx = obj->ox;
 707         oty = obj->oy;
 708         do {
 709                 tx = rn1(COLNO - 3, 2);
 710                 ty = rn2(ROWNO);
 711         } while (!goodpos(tx, ty));
 712         obj->ox = tx;
 713         obj->oy = ty;
 714         if (cansee(otx, oty))
 715                 newsym(otx, oty);
 716 }
 717
 718 /* fractured by pick-axe or wand of striking */
 719 /* no texts here! */
 720 void
 721 fracture_rock(struct obj *obj)
 722 {
 723         /* unpobj(obj); */
 724         obj->otyp = ROCK;
 725         obj->quan = 7 + rn2(60);
 726         obj->owt = weight(obj);
 727         obj->olet = WEAPON_SYM;
 728         if (cansee(obj->ox, obj->oy))
 729                 prl(obj->ox, obj->oy);
 730 }
 731
 732 static void
 733 burn_scrolls(void)
 734 {
 735         struct obj     *obj, *obj2;
 736         int             cnt = 0;
 737
 738         for (obj = invent; obj; obj = obj2) {
 739                 obj2 = obj->nobj;
 740                 if (obj->olet == SCROLL_SYM) {
 741                         cnt++;
 742                         useup(obj);
 743                 }
 744         }
 745         if (cnt > 1) {
 746                 pline("Your scrolls catch fire!");
 747                 losehp(cnt, "burning scrolls");
 748         } else if (cnt) {
 749                 pline("Your scroll catches fire!");
 750                 losehp(1, "burning scroll");
 751         }
 752 }