NAO vanilla mfndpos

gistfile1.txt

/* return number of acceptable neighbour positions */
int
mfndpos(mon, poss, info, flag)
	register struct monst *mon;
	coord *poss;	/* coord poss[9] */
	long *info;	/* long info[9] */
	long flag;
{
	struct permonst *mdat = mon->data;
	register xchar x,y,nx,ny;
	register int cnt = 0;
	register uchar ntyp;
	uchar nowtyp;
	boolean wantpool,poolok,lavaok,nodiag;
	boolean rockok = FALSE, treeok = FALSE, thrudoor;
	int maxx, maxy;

	x = mon->mx;
	y = mon->my;
	nowtyp = levl[x][y].typ;

	nodiag = (mdat == &mons[PM_GRID_BUG]);
	wantpool = mdat->mlet == S_EEL;
	poolok = is_flyer(mdat) || is_clinger(mdat) ||
		 (is_swimmer(mdat) && !wantpool);
	lavaok = is_flyer(mdat) || is_clinger(mdat) || likes_lava(mdat);
	thrudoor = ((flag & (ALLOW_WALL|BUSTDOOR)) != 0L);
	if (flag & ALLOW_DIG) {
	    struct obj *mw_tmp;

	    /* need to be specific about what can currently be dug */
	    if (!needspick(mdat)) {
		rockok = treeok = TRUE;
	    } else if ((mw_tmp = MON_WEP(mon)) && mw_tmp->cursed &&
		       mon->weapon_check == NO_WEAPON_WANTED) {
		rockok = is_pick(mw_tmp);
		treeok = is_axe(mw_tmp);
	    } else {
		rockok = (m_carrying(mon, PICK_AXE) ||
			  (m_carrying(mon, DWARVISH_MATTOCK) &&
			   !which_armor(mon, W_ARMS)));
		treeok = (m_carrying(mon, AXE) ||
			  (m_carrying(mon, BATTLE_AXE) &&
			   !which_armor(mon, W_ARMS)));
	    }
	    thrudoor |= rockok || treeok;
	}

nexttry:	/* eels prefer the water, but if there is no water nearby,
		   they will crawl over land */
	if(mon->mconf) {
		flag |= ALLOW_ALL;
		flag &= ~NOTONL;
	}
	if(!mon->mcansee)
		flag |= ALLOW_SSM;
	maxx = min(x+1,COLNO-1);
	maxy = min(y+1,ROWNO-1);
	for(nx = max(1,x-1); nx <= maxx; nx++)
	  for(ny = max(0,y-1); ny <= maxy; ny++) {
	    if(nx == x && ny == y) continue;
	    if(IS_ROCK(ntyp = levl[nx][ny].typ) &&
	       !((flag & ALLOW_WALL) && may_passwall(nx,ny)) &&
	       !((IS_TREE(ntyp) ? treeok : rockok) && may_dig(nx,ny))) continue;
	    /* KMH -- Added iron bars */
	    if (ntyp == IRONBARS && !(flag & ALLOW_BARS)) continue;
	    if(IS_DOOR(ntyp) && !amorphous(mdat) &&
	       ((levl[nx][ny].doormask & D_CLOSED && !(flag & OPENDOOR)) ||
		(levl[nx][ny].doormask & D_LOCKED && !(flag & UNLOCKDOOR))) &&
	       !thrudoor) continue;
	    if(nx != x && ny != y && (nodiag ||
#ifdef REINCARNATION
	       ((IS_DOOR(nowtyp) &&
		 ((levl[x][y].doormask & ~D_BROKEN) || Is_rogue_level(&u.uz))) ||
		(IS_DOOR(ntyp) &&
		 ((levl[nx][ny].doormask & ~D_BROKEN) || Is_rogue_level(&u.uz))))
#else
	       ((IS_DOOR(nowtyp) && (levl[x][y].doormask & ~D_BROKEN)) ||
		(IS_DOOR(ntyp) && (levl[nx][ny].doormask & ~D_BROKEN)))
#endif
	       ))
		continue;
	    if((is_pool(nx,ny) == wantpool || poolok) &&
	       (lavaok || !is_lava(nx,ny))) {
		int dispx, dispy;
		boolean monseeu = (mon->mcansee && (!Invis || perceives(mdat)));
		boolean checkobj = OBJ_AT(nx,ny);

		/* Displacement also displaces the Elbereth/scare monster,
		 * as long as you are visible.
		 */
		if(Displaced && monseeu && (mon->mux==nx) && (mon->muy==ny)) {
		    dispx = u.ux;
		    dispy = u.uy;
		} else {
		    dispx = nx;
		    dispy = ny;
		}

		info[cnt] = 0;
		if ((checkobj || Displaced) && onscary(dispx, dispy, mon)) {
		    if(!(flag & ALLOW_SSM)) continue;
		    info[cnt] |= ALLOW_SSM;
		}
		if((nx == u.ux && ny == u.uy) ||
		   (nx == mon->mux && ny == mon->muy)) {
			if (nx == u.ux && ny == u.uy) {
				/* If it's right next to you, it found you,
				 * displaced or no.  We must set mux and muy
				 * right now, so when we return we can tell
				 * that the ALLOW_U means to attack _you_ and
				 * not the image.
				 */
				mon->mux = u.ux;
				mon->muy = u.uy;
			}
			if(!(flag & ALLOW_U)) continue;
			info[cnt] |= ALLOW_U;
		} else {
			if(MON_AT(nx, ny)) {
				struct monst *mtmp2 = m_at(nx, ny);
				long mmflag = flag | mm_aggression(mon, mtmp2);

				if (!(mmflag & ALLOW_M)) continue;
				info[cnt] |= ALLOW_M;
				if (mtmp2->mtame) {
					if (!(mmflag & ALLOW_TM)) continue;
					info[cnt] |= ALLOW_TM;
				}
			}
			/* Note: ALLOW_SANCT only prevents movement, not */
			/* attack, into a temple. */
			if(level.flags.has_temple &&
			   *in_rooms(nx, ny, TEMPLE) &&
			   !*in_rooms(x, y, TEMPLE) &&
			   in_your_sanctuary((struct monst *)0, nx, ny)) {
				if(!(flag & ALLOW_SANCT)) continue;
				info[cnt] |= ALLOW_SANCT;
			}
		}
		if(checkobj && sobj_at(CLOVE_OF_GARLIC, nx, ny)) {
			if(flag & NOGARLIC) continue;
			info[cnt] |= NOGARLIC;
		}
		if(checkobj && sobj_at(BOULDER, nx, ny)) {
			if(!(flag & ALLOW_ROCK)) continue;
			info[cnt] |= ALLOW_ROCK;
		}
		if (monseeu && onlineu(nx,ny)) {
			if(flag & NOTONL) continue;
			info[cnt] |= NOTONL;
		}
		if (nx != x && ny != y && bad_rock(mdat, x, ny)
			    && bad_rock(mdat, nx, y)
			    && (bigmonst(mdat) || (curr_mon_load(mon) > 600)))
			continue;
		/* The monster avoids a particular type of trap if it's familiar
		 * with the trap type.  Pets get ALLOW_TRAPS and checking is
		 * done in dogmove.c.  In either case, "harmless" traps are
		 * neither avoided nor marked in info[].
		 */
		{ register struct trap *ttmp = t_at(nx, ny);
		    if(ttmp) {
			if(ttmp->ttyp >= TRAPNUM || ttmp->ttyp == 0)  {
impossible("A monster looked at a very strange trap of type %d.", ttmp->ttyp);
			    continue;
			}
			if ((ttmp->ttyp != RUST_TRAP
					|| mdat == &mons[PM_IRON_GOLEM])
				&& ttmp->ttyp != STATUE_TRAP
				&& ((ttmp->ttyp != PIT
				    && ttmp->ttyp != SPIKED_PIT
				    && ttmp->ttyp != TRAPDOOR
				    && ttmp->ttyp != HOLE)
				      || (!is_flyer(mdat)
				    && !is_floater(mdat)
				    && !is_clinger(mdat))
				      || In_sokoban(&u.uz))
				&& (ttmp->ttyp != SLP_GAS_TRAP ||
				    !resists_sleep(mon))
				&& (ttmp->ttyp != BEAR_TRAP ||
				    (mdat->msize > MZ_SMALL &&
				     !amorphous(mdat) && !is_flyer(mdat)))
				&& (ttmp->ttyp != FIRE_TRAP ||
				    !resists_fire(mon))
				&& (ttmp->ttyp != SQKY_BOARD || !is_flyer(mdat))
				&& (ttmp->ttyp != WEB || (!amorphous(mdat) &&
				    !webmaker(mdat)))
			) {
			    if (!(flag & ALLOW_TRAPS)) {
				if (mon->mtrapseen & (1L << (ttmp->ttyp - 1)))
				    continue;
			    }
			    info[cnt] |= ALLOW_TRAPS;
			}
		    }
		}
		poss[cnt].x = nx;
		poss[cnt].y = ny;
		cnt++;
	    }
	}
	if(!cnt && wantpool && !is_pool(x,y)) {
		wantpool = FALSE;
		goto nexttry;
	}
	return(cnt);
}