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Source:NetHack 3.3.0/dbridge.c

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Below is the full text to dbridge.c from the source code of NetHack 3.3.0. To link to a particular line, write [[NetHack 3.3.0/dbridge.c#line123]], for example.

Warning! This is the source code from an old release. For the latest release, see Source code

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1.    /*	SCCS Id: @(#)dbridge.c	3.3	97/05/25	*/
2.    /*	Copyright (c) 1989 by Jean-Christophe Collet		  */
3.    /* NetHack may be freely redistributed.  See license for details. */
4.    
5.    /*
6.     * This file contains the drawbridge manipulation (create, open, close,
7.     * destroy).
8.     *
9.     * Added comprehensive monster-handling, and the "entity" structure to
10.    * deal with players as well. - 11/89
11.    */
12.   
13.   #include "hack.h"
14.   
15.   #ifdef OVLB
16.   STATIC_DCL void FDECL(get_wall_for_db, (int *, int *));
17.   STATIC_DCL struct entity *FDECL(e_at, (int, int));
18.   STATIC_DCL void FDECL(m_to_e, (struct monst *, int, int, struct entity *));
19.   STATIC_DCL void FDECL(u_to_e, (struct entity *));
20.   STATIC_DCL void FDECL(set_entity, (int, int, struct entity *));
21.   STATIC_DCL const char *FDECL(e_nam, (struct entity *));
22.   #ifdef D_DEBUG
23.   static const char *FDECL(Enam, (struct entity *)); /* unused */
24.   #endif
25.   STATIC_DCL const char *FDECL(E_phrase, (struct entity *, const char *));
26.   STATIC_DCL boolean FDECL(e_survives_at, (struct entity *, int, int));
27.   STATIC_DCL void FDECL(e_died, (struct entity *, int, int));
28.   STATIC_DCL boolean FDECL(automiss, (struct entity *));
29.   STATIC_DCL boolean FDECL(e_missed, (struct entity *, BOOLEAN_P));
30.   STATIC_DCL boolean FDECL(e_jumps, (struct entity *));
31.   STATIC_DCL void FDECL(do_entity, (struct entity *));
32.   #endif /* OVLB */
33.   
34.   #ifdef OVL0
35.   
36.   boolean
37.   is_pool(x,y)
38.   int x,y;
39.   {
40.          register schar ltyp = levl[x][y].typ;
41.          if(ltyp == POOL || ltyp == MOAT || ltyp == WATER) return TRUE;
42.          if(ltyp == DRAWBRIDGE_UP &&
43.   	       (levl[x][y].drawbridgemask & DB_UNDER) == DB_MOAT) return TRUE;
44.          return FALSE;
45.   }
46.   
47.   boolean
48.   is_lava(x,y)
49.   int x,y;
50.   {
51.          register schar ltyp = levl[x][y].typ;
52.          if(ltyp == LAVAPOOL ||
53.   	  (ltyp == DRAWBRIDGE_UP &&
54.   	   (levl[x][y].drawbridgemask & DB_UNDER) == DB_LAVA)) return TRUE;
55.          return FALSE;
56.   }
57.   
58.   boolean
59.   is_ice(x,y)
60.   int x,y;
61.   {
62.   	register schar ltyp = levl[x][y].typ;
63.   	if (ltyp == ICE ||
64.   	    (ltyp == DRAWBRIDGE_UP &&
65.   		(levl[x][y].drawbridgemask & DB_UNDER) == DB_ICE)) return TRUE;
66.   	return FALSE;
67.   }
68.   
69.   #endif /* OVL0 */
70.   
71.   #ifdef OVL1
72.   
73.   /*
74.    * We want to know whether a wall (or a door) is the portcullis (passageway)
75.    * of an eventual drawbridge.
76.    *
77.    * Return value:  the direction of the drawbridge.
78.    */
79.   
80.   int
81.   is_drawbridge_wall(x,y)
82.   int x,y;
83.   {
84.   	struct rm *lev;
85.   
86.   	lev = &levl[x][y];
87.   	if (lev->typ != DOOR && lev->typ != DBWALL)
88.   		return (-1);
89.   
90.   	if (IS_DRAWBRIDGE(levl[x+1][y].typ) &&
91.   	    (levl[x+1][y].drawbridgemask & DB_DIR) == DB_WEST)
92.   		return (DB_WEST);
93.   	if (IS_DRAWBRIDGE(levl[x-1][y].typ) &&
94.   	    (levl[x-1][y].drawbridgemask & DB_DIR) == DB_EAST)
95.   		return (DB_EAST);
96.   	if (IS_DRAWBRIDGE(levl[x][y-1].typ) &&
97.   	    (levl[x][y-1].drawbridgemask & DB_DIR) == DB_SOUTH)
98.   		return (DB_SOUTH);
99.   	if (IS_DRAWBRIDGE(levl[x][y+1].typ) &&
100.  	    (levl[x][y+1].drawbridgemask & DB_DIR) == DB_NORTH)
101.  		return (DB_NORTH);
102.  
103.  	return (-1);
104.  }
105.  
106.  /*
107.   * Use is_db_wall where you want to verify that a
108.   * drawbridge "wall" is UP in the location x, y
109.   * (instead of UP or DOWN, as with is_drawbridge_wall).
110.   */
111.  boolean
112.  is_db_wall(x,y)
113.  int x,y;
114.  {
115.  	return((boolean)( levl[x][y].typ == DBWALL ));
116.  }
117.  
118.  
119.  /*
120.   * Return true with x,y pointing to the drawbridge if x,y initially indicate
121.   * a drawbridge or drawbridge wall.
122.   */
123.  boolean
124.  find_drawbridge(x,y)
125.  int *x,*y;
126.  {
127.  	int dir;
128.  
129.  	if (IS_DRAWBRIDGE(levl[*x][*y].typ))
130.  		return TRUE;
131.  	dir = is_drawbridge_wall(*x,*y);
132.  	if (dir >= 0) {
133.  		switch(dir) {
134.  			case DB_NORTH: (*y)++; break;
135.  			case DB_SOUTH: (*y)--; break;
136.  			case DB_EAST:  (*x)--; break;
137.  			case DB_WEST:  (*x)++; break;
138.  		}
139.  		return TRUE;
140.  	}
141.  	return FALSE;
142.  }
143.  
144.  #endif /* OVL1 */
145.  #ifdef OVLB
146.  
147.  /*
148.   * Find the drawbridge wall associated with a drawbridge.
149.   */
150.  STATIC_OVL void
151.  get_wall_for_db(x,y)
152.  int *x,*y;
153.  {
154.  	switch (levl[*x][*y].drawbridgemask & DB_DIR) {
155.  		case DB_NORTH: (*y)--; break;
156.  		case DB_SOUTH: (*y)++; break;
157.  		case DB_EAST:  (*x)++; break;
158.  		case DB_WEST:  (*x)--; break;
159.  	}
160.  }
161.  
162.  /*
163.   * Creation of a drawbridge at pos x,y.
164.   *     dir is the direction.
165.   *     flag must be put to TRUE if we want the drawbridge to be opened.
166.   */
167.  
168.  boolean
169.  create_drawbridge(x,y,dir,flag)
170.  int x,y,dir;
171.  boolean flag;
172.  {
173.  	int x2,y2;
174.  	boolean horiz;
175.  	boolean lava = levl[x][y].typ == LAVAPOOL; /* assume initialized map */
176.  
177.  	x2 = x; y2 = y;
178.  	switch(dir) {
179.  		case DB_NORTH:
180.  			horiz = TRUE;
181.  			y2--;
182.  			break;
183.  		case DB_SOUTH:
184.  			horiz = TRUE;
185.  			y2++;
186.  			break;
187.  		case DB_EAST:
188.  			horiz = FALSE;
189.  			x2++;
190.  			break;
191.  		default:
192.  			impossible("bad direction in create_drawbridge");
193.  			/* fall through */
194.  		case DB_WEST:
195.  			horiz = FALSE;
196.  			x2--;
197.  			break;
198.  	}
199.  	if (!IS_WALL(levl[x2][y2].typ))
200.  		return(FALSE);
201.  	if (flag) {             /* We want the bridge open */
202.  		levl[x][y].typ = DRAWBRIDGE_DOWN;
203.  		levl[x2][y2].typ = DOOR;
204.  		levl[x2][y2].doormask = D_NODOOR;
205.  	} else {
206.  		levl[x][y].typ = DRAWBRIDGE_UP;
207.  		levl[x2][y2].typ = DBWALL;
208.  		/* Drawbridges are non-diggable. */
209.  		levl[x2][y2].wall_info = W_NONDIGGABLE;
210.  	}
211.  	levl[x][y].horizontal = !horiz;
212.  	levl[x2][y2].horizontal = horiz;
213.  	levl[x][y].drawbridgemask = dir;
214.  	if(lava) levl[x][y].drawbridgemask |= DB_LAVA;
215.  	return(TRUE);
216.  }
217.  
218.  struct entity {
219.  	struct monst *emon;	  /* youmonst for the player */
220.  	struct permonst *edata;   /* must be non-zero for record to be valid */
221.  	int ex, ey;
222.  };
223.  
224.  #define ENTITIES 2
225.  
226.  static NEARDATA struct entity occupants[ENTITIES];
227.  
228.  STATIC_OVL
229.  struct entity *
230.  e_at(x, y)
231.  int x, y;
232.  {
233.  	int entitycnt;
234.  
235.  	for (entitycnt = 0; entitycnt < ENTITIES; entitycnt++)
236.  		if ((occupants[entitycnt].edata) &&
237.  		    (occupants[entitycnt].ex == x) &&
238.  		    (occupants[entitycnt].ey == y))
239.  			break;
240.  #ifdef D_DEBUG
241.  	pline("entitycnt = %d", entitycnt);
242.  	wait_synch();
243.  #endif
244.  	return((entitycnt == ENTITIES)?
245.  	       (struct entity *)0 : &(occupants[entitycnt]));
246.  }
247.  
248.  STATIC_OVL void
249.  m_to_e(mtmp, x, y, etmp)
250.  struct monst *mtmp;
251.  int x, y;
252.  struct entity *etmp;
253.  {
254.  	etmp->emon = mtmp;
255.  	if (mtmp) {
256.  		etmp->ex = x;
257.  		etmp->ey = y;
258.  		if (mtmp->wormno && (x != mtmp->mx || y != mtmp->my))
259.  			etmp->edata = &mons[PM_LONG_WORM_TAIL];
260.  		else
261.  			etmp->edata = mtmp->data;
262.  	} else
263.  		etmp->edata = (struct permonst *)0;
264.  }
265.  
266.  STATIC_OVL void
267.  u_to_e(etmp)
268.  struct entity *etmp;
269.  {
270.  	etmp->emon = &youmonst;
271.  	etmp->ex = u.ux;
272.  	etmp->ey = u.uy;
273.  	etmp->edata = youmonst.data;
274.  }
275.  
276.  STATIC_OVL void
277.  set_entity(x, y, etmp)
278.  int x, y;
279.  struct entity *etmp;
280.  {
281.  	if ((x == u.ux) && (y == u.uy))
282.  		u_to_e(etmp);
283.  	else if (MON_AT(x, y))
284.  		m_to_e(m_at(x, y), x, y, etmp);
285.  	else
286.  		etmp->edata = (struct permonst *)0;
287.  }
288.  
289.  #define is_u(etmp) (etmp->emon == &youmonst)
290.  #define e_canseemon(etmp) (is_u(etmp) ? (boolean)TRUE : canseemon(etmp->emon))
291.  
292.  /*
293.   * e_strg is a utility routine which is not actually in use anywhere, since
294.   * the specialized routines below suffice for all current purposes.
295.   */
296.  
297.  /* #define e_strg(etmp, func) (is_u(etmp)? (char *)0 : func(etmp->emon)) */
298.  
299.  STATIC_OVL const char *
300.  e_nam(etmp)
301.  struct entity *etmp;
302.  {
303.  	return(is_u(etmp)? "you" : mon_nam(etmp->emon));
304.  }
305.  
306.  #ifdef D_DEBUG
307.  /*
308.   * Enam is another unused utility routine:  E_phrase is preferable.
309.   */
310.  
311.  static const char *
312.  Enam(etmp)
313.  struct entity *etmp;
314.  {
315.  	return(is_u(etmp)? "You" : Monnam(etmp->emon));
316.  }
317.  #endif /* D_DEBUG */
318.  
319.  /*
320.   * Generates capitalized entity name, makes 2nd -> 3rd person conversion on
321.   * verb, where necessary.
322.   */
323.  
324.  STATIC_OVL const char *
325.  E_phrase(etmp, verb)
326.  struct entity *etmp;
327.  const char *verb;
328.  {
329.  	static char wholebuf[80];
330.  	char verbbuf[30];
331.  
332.  	Strcpy(wholebuf, is_u(etmp) ? "You" : Monnam(etmp->emon));
333.  	if (!*verb)
334.  		return(wholebuf);
335.  	Strcat(wholebuf, " ");
336.  	verbbuf[0] = '\0';
337.  	if (is_u(etmp))
338.  		Strcpy(verbbuf, verb);
339.  	else {
340.  		if (!strcmp(verb, "are"))
341.  			Strcpy(verbbuf, "is");
342.  		if (!strcmp(verb, "have"))
343.  			Strcpy(verbbuf, "has");
344.  		if (!verbbuf[0]) {
345.  			Strcpy(verbbuf, verb);
346.  			switch (verbbuf[strlen(verbbuf) - 1]) {
347.  				case 'y':
348.  					verbbuf[strlen(verbbuf) - 1] = '\0';
349.  					Strcat(verbbuf, "ies");
350.  					break;
351.  				case 'h':
352.  				case 'o':
353.  				case 's':
354.  					Strcat(verbbuf, "es");
355.  					break;
356.  				default:
357.  					Strcat(verbbuf, "s");
358.  					break;
359.  			}
360.  		}
361.  	}
362.  	Strcat(wholebuf, verbbuf);
363.  	return(wholebuf);
364.  }
365.  
366.  /*
367.   * Simple-minded "can it be here?" routine
368.   */
369.  
370.  STATIC_OVL boolean
371.  e_survives_at(etmp, x, y)
372.  struct entity *etmp;
373.  int x, y;
374.  {
375.  	if (noncorporeal(etmp->edata))
376.  		return(TRUE);
377.  	if (is_pool(x, y))
378.  		return (boolean)((is_u(etmp) &&
379.  				(Wwalking || Amphibious || Swimming ||
380.  				Flying || Levitation)) ||
381.  			is_swimmer(etmp->edata) || is_flyer(etmp->edata) ||
382.  			is_floater(etmp->edata));
383.  	/* must force call to lava_effects in e_died if is_u */
384.  	if (is_lava(x, y))
385.  		return (boolean)((is_u(etmp) && (Levitation || Flying)) ||
386.  			    likes_lava(etmp->edata) || is_flyer(etmp->edata));
387.  	if (is_db_wall(x, y))
388.  		return((boolean)(is_u(etmp) ? Passes_walls :
389.  			passes_walls(etmp->edata)));
390.  	return(TRUE);
391.  }
392.  
393.  STATIC_OVL void
394.  e_died(etmp, dest, how)
395.  struct entity *etmp;
396.  int dest, how;
397.  {
398.  	if (is_u(etmp)) {
399.  		if (how == DROWNING)
400.  			(void) drown();
401.  		else if (how == BURNING)
402.  			(void) lava_effects();
403.  		else {
404.  			coord xy;
405.  
406.  			killer_format = KILLED_BY_AN;
407.  			killer = "falling drawbridge";
408.  			done(how);
409.  			/* So, you didn't die */
410.  			if (!e_survives_at(etmp, etmp->ex, etmp->ey)) {
411.  			    if (enexto(&xy, etmp->ex, etmp->ey, etmp->edata)) {
412.  				pline("A %s force teleports you away...",
413.  				      Hallucination ? "normal" : "strange");
414.  				teleds(xy.x, xy.y);
415.  			    }
416.  			    /* otherwise on top of the drawbridge is the
417.  			     * only viable spot in the dungeon, so stay there
418.  			     */
419.  			}
420.  		}
421.  		/* we might have crawled out of the moat to survive */
422.  		etmp->ex = u.ux,  etmp->ey = u.uy;
423.  	} else {
424.  		/* fake "digested to death" damage-type suppresses corpse */
425.  #define mk_message(dest) ((dest & 1) ? "" : (char *)0)
426.  #define mk_corpse(dest)  ((dest & 2) ? AD_DGST : AD_PHYS)
427.  		/* if monsters are moving, one of them caused the destruction */
428.  		if (flags.mon_moving)
429.  		    monkilled(etmp->emon, mk_message(dest), mk_corpse(dest));
430.  		else		/* you caused it */
431.  		    xkilled(etmp->emon, dest);
432.  		etmp->edata = (struct permonst *)0;
433.  #undef mk_message
434.  #undef mk_corpse
435.  	}
436.  }
437.  
438.  
439.  /*
440.   * These are never directly affected by a bridge or portcullis.
441.   */
442.  
443.  STATIC_OVL boolean
444.  automiss(etmp)
445.  struct entity *etmp;
446.  {
447.  	return (boolean)((is_u(etmp) ? Passes_walls :
448.  			passes_walls(etmp->edata)) || noncorporeal(etmp->edata));
449.  }
450.  
451.  /*
452.   * Does falling drawbridge or portcullis miss etmp?
453.   */
454.  
455.  STATIC_OVL boolean
456.  e_missed(etmp, chunks)
457.  struct entity *etmp;
458.  boolean chunks;
459.  {
460.  	int misses;
461.  
462.  #ifdef D_DEBUG
463.  	if (chunks)
464.  		pline("Do chunks miss?");
465.  #endif
466.  	if (automiss(etmp))
467.  		return(TRUE);
468.  
469.  	if (is_flyer(etmp->edata) &&
470.  	    (is_u(etmp)? !Sleeping :
471.  	     (etmp->emon->mcanmove && !etmp->emon->msleeping)))
472.  						 /* flying requires mobility */
473.  		misses = 5;	/* out of 8 */
474.  	else if (is_floater(etmp->edata) ||
475.  		    (is_u(etmp) && Levitation))	 /* doesn't require mobility */
476.  		misses = 3;
477.  	else if (chunks && is_pool(etmp->ex, etmp->ey))
478.  		misses = 2;				    /* sitting ducks */
479.  	else
480.  		misses = 0;
481.  
482.  	if (is_db_wall(etmp->ex, etmp->ey))
483.  		misses -= 3;				    /* less airspace */
484.  
485.  #ifdef D_DEBUG
486.  	pline("Miss chance = %d (out of 8)", misses);
487.  #endif
488.  
489.  	return((boolean)((misses >= rnd(8))? TRUE : FALSE));
490.  }
491.  
492.  /*
493.   * Can etmp jump from death?
494.   */
495.  
496.  STATIC_OVL boolean
497.  e_jumps(etmp)
498.  struct entity *etmp;
499.  {
500.  	int tmp = 4;		/* out of 10 */
501.  
502.  	if (is_u(etmp)? (Sleeping || Fumbling) :
503.  		        (!etmp->emon->mcanmove || etmp->emon->msleeping ||
504.  			 !etmp->edata->mmove   || etmp->emon->wormno))
505.  		return(FALSE);
506.  
507.  	if (is_u(etmp)? Confusion : etmp->emon->mconf)
508.  		tmp -= 2;
509.  
510.  	if (is_u(etmp)? Stunned : etmp->emon->mstun)
511.  		tmp -= 3;
512.  
513.  	if (is_db_wall(etmp->ex, etmp->ey))
514.  		tmp -= 2;			    /* less room to maneuver */
515.  
516.  #ifdef D_DEBUG
517.  	pline("%s to jump (%d chances in 10)", E_phrase(etmp, "try"), tmp);
518.  #endif
519.  	return((boolean)((tmp >= rnd(10))? TRUE : FALSE));
520.  }
521.  
522.  STATIC_OVL void
523.  do_entity(etmp)
524.  struct entity *etmp;
525.  {
526.  	int newx, newy, at_portcullis, oldx, oldy;
527.  	boolean must_jump = FALSE, relocates = FALSE, e_inview;
528.  	struct rm *crm;
529.  
530.  	if (!etmp->edata)
531.  		return;
532.  
533.  	e_inview = e_canseemon(etmp);
534.  	oldx = etmp->ex;
535.  	oldy = etmp->ey;
536.  	at_portcullis = is_db_wall(oldx, oldy);
537.  	crm = &levl[oldx][oldy];
538.  
539.  	if (automiss(etmp) && e_survives_at(etmp, oldx, oldy)) {
540.  		if (e_inview && (at_portcullis || IS_DRAWBRIDGE(crm->typ)))
541.  			pline_The("%s passes through %s!",
542.  			      at_portcullis ? "portcullis" : "drawbridge",
543.  			      e_nam(etmp));
544.  		return;
545.  	}
546.  	if (e_missed(etmp, FALSE)) {
547.  		if (at_portcullis)
548.  			pline_The("portcullis misses %s!",
549.  			      e_nam(etmp));
550.  #ifdef D_DEBUG
551.  		else
552.  			pline_The("drawbridge misses %s!",
553.  			      e_nam(etmp));
554.  #endif
555.  		if (e_survives_at(etmp, oldx, oldy))
556.  			return;
557.  		else {
558.  #ifdef D_DEBUG
559.  			pline("Mon can't survive here");
560.  #endif
561.  			if (at_portcullis)
562.  				must_jump = TRUE;
563.  			else
564.  				relocates = TRUE; /* just ride drawbridge in */
565.  		}
566.  	} else {
567.  		if (crm->typ == DRAWBRIDGE_DOWN) {
568.  			pline("%s crushed underneath the drawbridge.",
569.  			      E_phrase(etmp, "are"));		  /* no jump */
570.  			e_died(etmp, e_inview? 3 : 2, CRUSHING);/* no corpse */
571.  			return;   /* Note: Beyond this point, we know we're  */
572.  		}		  /* not at an opened drawbridge, since all  */
573.  		must_jump = TRUE; /* *missable* creatures survive on the     */
574.  	}			  /* square, and all the unmissed ones die.  */
575.  	if (must_jump) {
576.  	    if (at_portcullis) {
577.  		if (e_jumps(etmp)) {
578.  		    relocates = TRUE;
579.  #ifdef D_DEBUG
580.  		    pline("Jump succeeds!");
581.  #endif
582.  		} else {
583.  		    if (e_inview)
584.  			pline("%s crushed by the falling portcullis!",
585.  			      E_phrase(etmp, "are"));
586.  		    else if (flags.soundok)
587.  			You_hear("a crushing sound.");
588.  		    e_died(etmp, e_inview? 3 : 2, CRUSHING);
589.  		    /* no corpse */
590.  		    return;
591.  		}
592.  	    } else { /* tries to jump off bridge to original square */
593.  		relocates = !e_jumps(etmp);
594.  #ifdef D_DEBUG
595.  		pline("Jump %s!", (relocates)? "fails" : "succeeds");
596.  #endif
597.  	    }
598.  	}
599.  
600.  /*
601.   * Here's where we try to do relocation.  Assumes that etmp is not arriving
602.   * at the portcullis square while the drawbridge is falling, since this square
603.   * would be inaccessible (i.e. etmp started on drawbridge square) or
604.   * unnecessary (i.e. etmp started here) in such a situation.
605.   */
606.  #ifdef D_DEBUG
607.  	pline("Doing relocation.");
608.  #endif
609.  	newx = oldx;
610.  	newy = oldy;
611.  	(void)find_drawbridge(&newx, &newy);
612.  	if ((newx == oldx) && (newy == oldy))
613.  		get_wall_for_db(&newx, &newy);
614.  #ifdef D_DEBUG
615.  	pline("Checking new square for occupancy.");
616.  #endif
617.  	if (relocates && (e_at(newx, newy))) {
618.  
619.  /*
620.   * Standoff problem:  one or both entities must die, and/or both switch
621.   * places.  Avoid infinite recursion by checking first whether the other
622.   * entity is staying put.  Clean up if we happen to move/die in recursion.
623.   */
624.  		struct entity *other;
625.  
626.  		other = e_at(newx, newy);
627.  #ifdef D_DEBUG
628.  		pline("New square is occupied by %s", e_nam(other));
629.  #endif
630.  		if (e_survives_at(other, newx, newy) && automiss(other)) {
631.  			relocates = FALSE;	      /* "other" won't budge */
632.  #ifdef D_DEBUG
633.  			pline("%s suicide.", E_phrase(etmp, "commit"));
634.  #endif
635.  		} else {
636.  
637.  #ifdef D_DEBUG
638.  			pline("Handling %s", e_nam(other));
639.  #endif
640.  			while ((e_at(newx, newy) != 0) &&
641.  			       (e_at(newx, newy) != etmp))
642.  				do_entity(other);
643.  #ifdef D_DEBUG
644.  			pline("Checking existence of %s", e_nam(etmp));
645.  			wait_synch();
646.  #endif
647.  			if (e_at(oldx, oldy) != etmp) {
648.  #ifdef D_DEBUG
649.  			    pline("%s moved or died in recursion somewhere",
650.  				  E_phrase(etmp, "have"));
651.  			    wait_synch();
652.  #endif
653.  			    return;
654.  			}
655.  		}
656.  	}
657.  	if (relocates && !e_at(newx, newy)) {/* if e_at() entity = worm tail */
658.  #ifdef D_DEBUG
659.  		pline("Moving %s", e_nam(etmp));
660.  #endif
661.  		if (!is_u(etmp)) {
662.  			remove_monster(etmp->ex, etmp->ey);
663.  			place_monster(etmp->emon, newx, newy);
664.  			update_monster_region(etmp->emon);
665.  		} else {
666.  			u.ux = newx;
667.  			u.uy = newy;
668.  		}
669.  		etmp->ex = newx;
670.  		etmp->ey = newy;
671.  		e_inview = e_canseemon(etmp);
672.  	}
673.  #ifdef D_DEBUG
674.  	pline("Final disposition of %s", e_nam(etmp));
675.  	wait_synch();
676.  #endif
677.  	if (is_db_wall(etmp->ex, etmp->ey)) {
678.  #ifdef D_DEBUG
679.  		pline("%s in portcullis chamber", E_phrase(etmp, "are"));
680.  		wait_synch();
681.  #endif
682.  		if (e_inview) {
683.  			if (is_u(etmp)) {
684.  				You("tumble towards the closed portcullis!");
685.  				if (automiss(etmp))
686.  					You("pass through it!");
687.  				else
688.  					pline_The("drawbridge closes in...");
689.  			} else
690.  				pline("%s behind the drawbridge.",
691.  				      E_phrase(etmp, "disappear"));
692.  		}
693.  		if (!e_survives_at(etmp, etmp->ex, etmp->ey)) {
694.  			killer_format = KILLED_BY_AN;
695.  			killer = "closing drawbridge";
696.  			e_died(etmp, 0, CRUSHING);	       /* no message */
697.  			return;
698.  		}
699.  #ifdef D_DEBUG
700.  		pline("%s in here", E_phrase(etmp, "survive"));
701.  #endif
702.  	} else {
703.  #ifdef D_DEBUG
704.  		pline("%s on drawbridge square", E_phrase(etmp, "are"));
705.  #endif
706.  		if (is_pool(etmp->ex, etmp->ey) && !e_inview)
707.  			if (flags.soundok)
708.  				You_hear("a splash.");
709.  		if (e_survives_at(etmp, etmp->ex, etmp->ey)) {
710.  			if (e_inview && !is_flyer(etmp->edata) &&
711.  			    !is_floater(etmp->edata))
712.  				pline("%s from the bridge.",
713.  				      E_phrase(etmp, "fall"));
714.  			return;
715.  		}
716.  #ifdef D_DEBUG
717.  		pline("%s cannot survive on the drawbridge square",Enam(etmp));
718.  #endif
719.  		if (is_pool(etmp->ex, etmp->ey) || is_lava(etmp->ex, etmp->ey))
720.  		    if (e_inview && !is_u(etmp)) {
721.  			/* drown() will supply msgs if nec. */
722.  			boolean lava = is_lava(etmp->ex, etmp->ey);
723.  
724.  			if (Hallucination)
725.  			    pline("%s the %s and disappears.",
726.  				  E_phrase(etmp, "drink"),
727.  				  lava ? "lava" : "moat");
728.  			else
729.  			    pline("%s into the %s.",
730.  				  E_phrase(etmp, "fall"),
731.  				  lava ? "lava" : "moat");
732.  		    }
733.  		killer_format = NO_KILLER_PREFIX;
734.  		killer = "fell from a drawbridge";
735.  		e_died(etmp, e_inview ? 3 : 2,      /* CRUSHING is arbitrary */
736.  		       (is_pool(etmp->ex, etmp->ey)) ? DROWNING :
737.  		       (is_lava(etmp->ex, etmp->ey)) ? BURNING :
738.  						       CRUSHING); /*no corpse*/
739.  		return;
740.  	}
741.  }
742.  
743.  /*
744.   * Close the drawbridge located at x,y
745.   */
746.  
747.  void
748.  close_drawbridge(x,y)
749.  int x,y;
750.  {
751.  	register struct rm *lev1, *lev2;
752.  	struct trap *t;
753.  	int x2, y2;
754.  
755.  	lev1 = &levl[x][y];
756.  	if (lev1->typ != DRAWBRIDGE_DOWN) return;
757.  	x2 = x; y2 = y;
758.  	get_wall_for_db(&x2,&y2);
759.  	if (cansee(x,y) || cansee(x2,y2))
760.  		You("see a drawbridge %s up!",
761.  		    (((u.ux == x || u.uy == y) && !Underwater) ||
762.  		     distu(x2,y2) < distu(x,y)) ? "coming" : "going");
763.  	lev1->typ = DRAWBRIDGE_UP;
764.  	lev2 = &levl[x2][y2];
765.  	lev2->typ = DBWALL;
766.  	switch (lev1->drawbridgemask & DB_DIR) {
767.  		case DB_NORTH:
768.  		case DB_SOUTH:
769.  			lev2->horizontal = TRUE;
770.  			break;
771.  		case DB_WEST:
772.  		case DB_EAST:
773.  			lev2->horizontal = FALSE;
774.  			break;
775.  	}
776.  	lev2->wall_info = W_NONDIGGABLE;
777.  	set_entity(x, y, &(occupants[0]));
778.  	set_entity(x2, y2, &(occupants[1]));
779.  	do_entity(&(occupants[0]));		/* Do set_entity after first */
780.  	set_entity(x2, y2, &(occupants[1]));	/* do_entity for worm tail */
781.  	do_entity(&(occupants[1]));
782.  	if(OBJ_AT(x,y) && flags.soundok)
783.  	    You_hear("smashing and crushing.");
784.  	(void) revive_nasty(x,y,(char *)0);
785.  	(void) revive_nasty(x2,y2,(char *)0);
786.  	delallobj(x, y);
787.  	delallobj(x2, y2);
788.  	if ((t = t_at(x, y)) != 0) deltrap(t);
789.  	if ((t = t_at(x2, y2)) != 0) deltrap(t);
790.  	newsym(x, y);
791.  	newsym(x2, y2);
792.  	block_point(x2,y2);	/* vision */
793.  }
794.  
795.  /*
796.   * Open the drawbridge located at x,y
797.   */
798.  
799.  void
800.  open_drawbridge(x,y)
801.  int x,y;
802.  {
803.  	register struct rm *lev1, *lev2;
804.  	struct trap *t;
805.  	int x2, y2;
806.  
807.  	lev1 = &levl[x][y];
808.  	if (lev1->typ != DRAWBRIDGE_UP) return;
809.  	x2 = x; y2 = y;
810.  	get_wall_for_db(&x2,&y2);
811.  	if (cansee(x,y) || cansee(x2,y2))
812.  		You("see a drawbridge %s down!",
813.  		    (distu(x2,y2) < distu(x,y)) ? "going" : "coming");
814.  	lev1->typ = DRAWBRIDGE_DOWN;
815.  	lev2 = &levl[x2][y2];
816.  	lev2->typ = DOOR;
817.  	lev2->doormask = D_NODOOR;
818.  	set_entity(x, y, &(occupants[0]));
819.  	set_entity(x2, y2, &(occupants[1]));
820.  	do_entity(&(occupants[0]));		/* do set_entity after first */
821.  	set_entity(x2, y2, &(occupants[1]));	/* do_entity for worm tails */
822.  	do_entity(&(occupants[1]));
823.  	(void) revive_nasty(x,y,(char *)0);
824.  	delallobj(x, y);
825.  	if ((t = t_at(x, y)) != 0) deltrap(t);
826.  	if ((t = t_at(x2, y2)) != 0) deltrap(t);
827.  	newsym(x, y);
828.  	newsym(x2, y2);
829.  	unblock_point(x2,y2);	/* vision */
830.  	if (Is_stronghold(&u.uz)) u.uevent.uopened_dbridge = TRUE;
831.  }
832.  
833.  /*
834.   * Let's destroy the drawbridge located at x,y
835.   */
836.  
837.  void
838.  destroy_drawbridge(x,y)
839.  int x,y;
840.  {
841.  	register struct rm *lev1, *lev2;
842.  	struct trap *t;
843.  	int x2, y2;
844.  	boolean e_inview;
845.  	struct entity *etmp1 = &(occupants[0]), *etmp2 = &(occupants[1]);
846.  
847.  	lev1 = &levl[x][y];
848.  	if (!IS_DRAWBRIDGE(lev1->typ))
849.  		return;
850.  	x2 = x; y2 = y;
851.  	get_wall_for_db(&x2,&y2);
852.  	lev2 = &levl[x2][y2];
853.  	if ((lev1->drawbridgemask & DB_UNDER) == DB_MOAT ||
854.  	    (lev1->drawbridgemask & DB_UNDER) == DB_LAVA) {
855.  		struct obj *otmp;
856.  		boolean lava = (lev1->drawbridgemask & DB_UNDER) == DB_LAVA;
857.  		if (lev1->typ == DRAWBRIDGE_UP) {
858.  			if (cansee(x2,y2))
859.  			    pline_The("portcullis of the drawbridge falls into the %s!",
860.  				  lava ? "lava" : "moat");
861.  			else if (flags.soundok)
862.  				You_hear("a loud *SPLASH*!");
863.  		} else {
864.  			if (cansee(x,y))
865.  			    pline_The("drawbridge collapses into the %s!",
866.  				  lava ? "lava" : "moat");
867.  			else if (flags.soundok)
868.  				You_hear("a loud *SPLASH*!");
869.  		}
870.  		lev1->typ = lava ? LAVAPOOL : MOAT;
871.  		lev1->drawbridgemask = 0;
872.  		if ((otmp = sobj_at(BOULDER,x,y)) != 0) {
873.  		    obj_extract_self(otmp);
874.  		    (void) flooreffects(otmp,x,y,"fall");
875.  		}
876.  	} else {
877.  		if (cansee(x,y))
878.  			pline_The("drawbridge disintegrates!");
879.  		else
880.  			You_hear("a loud *CRASH*!");
881.  		lev1->typ =
882.  			((lev1->drawbridgemask & DB_ICE) ? ICE : ROOM);
883.  		lev1->icedpool =
884.  			((lev1->drawbridgemask & DB_ICE) ? ICED_MOAT : 0);
885.  	}
886.  	wake_nearto(x, y, 500);
887.  	lev2->typ = DOOR;
888.  	lev2->doormask = D_NODOOR;
889.  	if ((t = t_at(x, y)) != 0) deltrap(t);
890.  	if ((t = t_at(x2, y2)) != 0) deltrap(t);
891.  	newsym(x,y);
892.  	newsym(x2,y2);
893.  	if (!does_block(x2,y2,lev2)) unblock_point(x2,y2);	/* vision */
894.  	if (Is_stronghold(&u.uz)) u.uevent.uopened_dbridge = TRUE;
895.  
896.  	set_entity(x2, y2, etmp2); /* currently only automissers can be here */
897.  	if (etmp2->edata) {
898.  		e_inview = e_canseemon(etmp2);
899.  		if (!automiss(etmp2)) {
900.  			if (e_inview)
901.  				pline("%s blown apart by flying debris.",
902.  				      E_phrase(etmp2, "are"));
903.  			killer_format = KILLED_BY_AN;
904.  			killer = "exploding drawbridge";
905.  			e_died(etmp2, e_inview? 3 : 2, CRUSHING); /*no corpse*/
906.  		}	     /* nothing which is vulnerable can survive this */
907.  	}
908.  	set_entity(x, y, etmp1);
909.  	if (etmp1->edata) {
910.  		e_inview = e_canseemon(etmp1);
911.  		if (e_missed(etmp1, TRUE)) {
912.  #ifdef D_DEBUG
913.  			pline("%s spared!", E_phrase(etmp1, "are"));
914.  #endif
915.  		} else {
916.  			if (e_inview) {
917.  			    if (!is_u(etmp1) && Hallucination)
918.  				pline("%s into some heavy metal",
919.  				      E_phrase(etmp1, "get"));
920.  			    else
921.  				pline("%s hit by a huge chunk of metal!",
922.  				      E_phrase(etmp1, "are"));
923.  			} else {
924.  			    if (flags.soundok && !is_u(etmp1) && !is_pool(x,y))
925.  				You_hear("a crushing sound.");
926.  #ifdef D_DEBUG
927.  			    else
928.  				pline("%s from shrapnel",
929.  				      E_phrase(etmp1, "die"));
930.  #endif
931.  			}
932.  			killer_format = KILLED_BY_AN;
933.  			killer = "collapsing drawbridge";
934.  			e_died(etmp1, e_inview? 3 : 2, CRUSHING); /*no corpse*/
935.  			if(lev1->typ == MOAT) do_entity(etmp1);
936.  		}
937.  	}
938.  }
939.  
940.  #endif /* OVLB */
941.  
942.  /*dbridge.c*/

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