Source:NetHack 3.4.3/src/dbridge.c

Below is the full text to src/dbridge.c from NetHack 3.4.3. To link to a particular line, write [[dbridge.c#line123]], for example.

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1.    /*	SCCS Id: @(#)dbridge.c	3.4	2003/02/08	*/
2.    /*	Copyright (c) 1989 by Jean-Christophe Collet		  */
3.    /* NetHack may be freely redistributed.  See license for details. */
4.    

The NetHack General Public License applies to screenshots, source code and other content from NetHack.

This content was modified from the original NetHack source code distribution (by splitting up NetHack content between wiki pages, and possibly further editing). See the page history for a list of who changed it, and on what dates.

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.   

is_pool

34.   #ifdef OVL0
35.   
36.   boolean
37.   is_pool(x,y)
38.   int x,y;
39.   {
40.       schar ltyp;
41.   
42.       if (!isok(x,y)) return FALSE;
43.       ltyp = levl[x][y].typ;
44.       if (ltyp == POOL || ltyp == MOAT || ltyp == WATER) return TRUE;
45.       if (ltyp == DRAWBRIDGE_UP &&
46.   	(levl[x][y].drawbridgemask & DB_UNDER) == DB_MOAT) return TRUE;
47.       return FALSE;
48.   }
49.   

is_lava

50.   boolean
51.   is_lava(x,y)
52.   int x,y;
53.   {
54.       schar ltyp;
55.   
56.       if (!isok(x,y)) return FALSE;
57.       ltyp = levl[x][y].typ;
58.       if (ltyp == LAVAPOOL
59.   	|| (ltyp == DRAWBRIDGE_UP
60.   	    && (levl[x][y].drawbridgemask & DB_UNDER) == DB_LAVA)) return TRUE;
61.       return FALSE;
62.   }
63.   

is_ice

64.   boolean
65.   is_ice(x,y)
66.   int x,y;
67.   {
68.       schar ltyp;
69.   
70.       if (!isok(x,y)) return FALSE;
71.       ltyp = levl[x][y].typ;
72.       if (ltyp == ICE
73.   	|| (ltyp == DRAWBRIDGE_UP
74.   	    && (levl[x][y].drawbridgemask & DB_UNDER) == DB_ICE)) return TRUE;
75.       return FALSE;
76.   }
77.   
78.   #endif /* OVL0 */
79.   

is_drawbridge_wall

80.   #ifdef OVL1
81.   
82.   /*
83.    * We want to know whether a wall (or a door) is the portcullis (passageway)
84.    * of an eventual drawbridge.
85.    *
86.    * Return value:  the direction of the drawbridge.
87.    */
88.   
89.   int
90.   is_drawbridge_wall(x,y)
91.   int x,y;
92.   {
93.   	struct rm *lev;
94.   
95.   	lev = &levl[x][y];
96.   	if (lev->typ != DOOR && lev->typ != DBWALL)
97.   		return (-1);
98.   
99.   	if (IS_DRAWBRIDGE(levl[x+1][y].typ) &&
100.  	    (levl[x+1][y].drawbridgemask & DB_DIR) == DB_WEST)
101.  		return (DB_WEST);
102.  	if (IS_DRAWBRIDGE(levl[x-1][y].typ) &&
103.  	    (levl[x-1][y].drawbridgemask & DB_DIR) == DB_EAST)
104.  		return (DB_EAST);
105.  	if (IS_DRAWBRIDGE(levl[x][y-1].typ) &&
106.  	    (levl[x][y-1].drawbridgemask & DB_DIR) == DB_SOUTH)
107.  		return (DB_SOUTH);
108.  	if (IS_DRAWBRIDGE(levl[x][y+1].typ) &&
109.  	    (levl[x][y+1].drawbridgemask & DB_DIR) == DB_NORTH)
110.  		return (DB_NORTH);
111.  
112.  	return (-1);
113.  }
114.  

is_db_wall

115.  /*
116.   * Use is_db_wall where you want to verify that a
117.   * drawbridge "wall" is UP in the location x, y
118.   * (instead of UP or DOWN, as with is_drawbridge_wall).
119.   */
120.  boolean
121.  is_db_wall(x,y)
122.  int x,y;
123.  {
124.  	return((boolean)( levl[x][y].typ == DBWALL ));
125.  }
126.  
127.  

find_drawbridge

128.  /*
129.   * Return true with x,y pointing to the drawbridge if x,y initially indicate
130.   * a drawbridge or drawbridge wall.
131.   */
132.  boolean
133.  find_drawbridge(x,y)
134.  int *x,*y;
135.  {
136.  	int dir;
137.  
138.  	if (IS_DRAWBRIDGE(levl[*x][*y].typ))
139.  		return TRUE;
140.  	dir = is_drawbridge_wall(*x,*y);
141.  	if (dir >= 0) {
142.  		switch(dir) {
143.  			case DB_NORTH: (*y)++; break;
144.  			case DB_SOUTH: (*y)--; break;
145.  			case DB_EAST:  (*x)--; break;
146.  			case DB_WEST:  (*x)++; break;
147.  		}
148.  		return TRUE;
149.  	}
150.  	return FALSE;
151.  }
152.  
153.  #endif /* OVL1 */

get_wall_for_db

154.  #ifdef OVLB
155.  
156.  /*
157.   * Find the drawbridge wall associated with a drawbridge.
158.   */
159.  STATIC_OVL void
160.  get_wall_for_db(x,y)
161.  int *x,*y;
162.  {
163.  	switch (levl[*x][*y].drawbridgemask & DB_DIR) {
164.  		case DB_NORTH: (*y)--; break;
165.  		case DB_SOUTH: (*y)++; break;
166.  		case DB_EAST:  (*x)++; break;
167.  		case DB_WEST:  (*x)--; break;
168.  	}
169.  }
170.  

create_drawbridge

171.  /*
172.   * Creation of a drawbridge at pos x,y.
173.   *     dir is the direction.
174.   *     flag must be put to TRUE if we want the drawbridge to be opened.
175.   */
176.  
177.  boolean
178.  create_drawbridge(x,y,dir,flag)
179.  int x,y,dir;
180.  boolean flag;
181.  {
182.  	int x2,y2;
183.  	boolean horiz;
184.  	boolean lava = levl[x][y].typ == LAVAPOOL; /* assume initialized map */
185.  
186.  	x2 = x; y2 = y;
187.  	switch(dir) {
188.  		case DB_NORTH:
189.  			horiz = TRUE;
190.  			y2--;
191.  			break;
192.  		case DB_SOUTH:
193.  			horiz = TRUE;
194.  			y2++;
195.  			break;
196.  		case DB_EAST:
197.  			horiz = FALSE;
198.  			x2++;
199.  			break;
200.  		default:
201.  			impossible("bad direction in create_drawbridge");
202.  			/* fall through */
203.  		case DB_WEST:
204.  			horiz = FALSE;
205.  			x2--;
206.  			break;
207.  	}
208.  	if (!IS_WALL(levl[x2][y2].typ))
209.  		return(FALSE);
210.  	if (flag) {             /* We want the bridge open */
211.  		levl[x][y].typ = DRAWBRIDGE_DOWN;
212.  		levl[x2][y2].typ = DOOR;
213.  		levl[x2][y2].doormask = D_NODOOR;
214.  	} else {
215.  		levl[x][y].typ = DRAWBRIDGE_UP;
216.  		levl[x2][y2].typ = DBWALL;
217.  		/* Drawbridges are non-diggable. */
218.  		levl[x2][y2].wall_info = W_NONDIGGABLE;
219.  	}
220.  	levl[x][y].horizontal = !horiz;
221.  	levl[x2][y2].horizontal = horiz;
222.  	levl[x][y].drawbridgemask = dir;
223.  	if(lava) levl[x][y].drawbridgemask |= DB_LAVA;
224.  	return(TRUE);
225.  }
226.  

e_at

227.  struct entity {
228.  	struct monst *emon;	  /* youmonst for the player */
229.  	struct permonst *edata;   /* must be non-zero for record to be valid */
230.  	int ex, ey;
231.  };
232.  
233.  #define ENTITIES 2
234.  
235.  static NEARDATA struct entity occupants[ENTITIES];
236.  
237.  STATIC_OVL
238.  struct entity *
239.  e_at(x, y)
240.  int x, y;
241.  {
242.  	int entitycnt;
243.  
244.  	for (entitycnt = 0; entitycnt < ENTITIES; entitycnt++)
245.  		if ((occupants[entitycnt].edata) &&
246.  		    (occupants[entitycnt].ex == x) &&
247.  		    (occupants[entitycnt].ey == y))
248.  			break;
249.  #ifdef D_DEBUG
250.  	pline("entitycnt = %d", entitycnt);
251.  	wait_synch();
252.  #endif
253.  	return((entitycnt == ENTITIES)?
254.  	       (struct entity *)0 : &(occupants[entitycnt]));
255.  }
256.  

m_to_e

257.  STATIC_OVL void
258.  m_to_e(mtmp, x, y, etmp)
259.  struct monst *mtmp;
260.  int x, y;
261.  struct entity *etmp;
262.  {
263.  	etmp->emon = mtmp;
264.  	if (mtmp) {
265.  		etmp->ex = x;
266.  		etmp->ey = y;
267.  		if (mtmp->wormno && (x != mtmp->mx || y != mtmp->my))
268.  			etmp->edata = &mons[PM_LONG_WORM_TAIL];
269.  		else
270.  			etmp->edata = mtmp->data;
271.  	} else
272.  		etmp->edata = (struct permonst *)0;
273.  }
274.  

u_to_e

275.  STATIC_OVL void
276.  u_to_e(etmp)
277.  struct entity *etmp;
278.  {
279.  	etmp->emon = &youmonst;
280.  	etmp->ex = u.ux;
281.  	etmp->ey = u.uy;
282.  	etmp->edata = youmonst.data;
283.  }
284.  

set_entity

285.  STATIC_OVL void
286.  set_entity(x, y, etmp)
287.  int x, y;
288.  struct entity *etmp;
289.  {
290.  	if ((x == u.ux) && (y == u.uy))
291.  		u_to_e(etmp);
292.  	else if (MON_AT(x, y))
293.  		m_to_e(m_at(x, y), x, y, etmp);
294.  	else
295.  		etmp->edata = (struct permonst *)0;
296.  }
297.  

e_nam

298.  #define is_u(etmp) (etmp->emon == &youmonst)
299.  #define e_canseemon(etmp) (is_u(etmp) ? (boolean)TRUE : canseemon(etmp->emon))
300.  
301.  /*
302.   * e_strg is a utility routine which is not actually in use anywhere, since
303.   * the specialized routines below suffice for all current purposes.
304.   */
305.  
306.  /* #define e_strg(etmp, func) (is_u(etmp)? (char *)0 : func(etmp->emon)) */
307.  
308.  STATIC_OVL const char *
309.  e_nam(etmp)
310.  struct entity *etmp;
311.  {
312.  	return(is_u(etmp)? "you" : mon_nam(etmp->emon));
313.  }
314.  

Enam

315.  #ifdef D_DEBUG
316.  /*
317.   * Enam is another unused utility routine:  E_phrase is preferable.
318.   */
319.  
320.  static const char *
321.  Enam(etmp)
322.  struct entity *etmp;
323.  {
324.  	return(is_u(etmp)? "You" : Monnam(etmp->emon));
325.  }
326.  #endif /* D_DEBUG */
327.  

E_phrase

328.  /*
329.   * Generates capitalized entity name, makes 2nd -> 3rd person conversion on
330.   * verb, where necessary.
331.   */
332.  
333.  STATIC_OVL const char *
334.  E_phrase(etmp, verb)
335.  struct entity *etmp;
336.  const char *verb;
337.  {
338.  	static char wholebuf[80];
339.  
340.  	Strcpy(wholebuf, is_u(etmp) ? "You" : Monnam(etmp->emon));
341.  	if (!*verb) return(wholebuf);
342.  	Strcat(wholebuf, " ");
343.  	if (is_u(etmp))
344.  	    Strcat(wholebuf, verb);
345.  	else
346.  	    Strcat(wholebuf, vtense((char *)0, verb));
347.  	return(wholebuf);
348.  }
349.  

e_survives_at

350.  /*
351.   * Simple-minded "can it be here?" routine
352.   */
353.  
354.  STATIC_OVL boolean
355.  e_survives_at(etmp, x, y)
356.  struct entity *etmp;
357.  int x, y;
358.  {
359.  	if (noncorporeal(etmp->edata))
360.  		return(TRUE);
361.  	if (is_pool(x, y))
362.  		return (boolean)((is_u(etmp) &&
363.  				(Wwalking || Amphibious || Swimming ||
364.  				Flying || Levitation)) ||
365.  			is_swimmer(etmp->edata) || is_flyer(etmp->edata) ||
366.  			is_floater(etmp->edata));
367.  	/* must force call to lava_effects in e_died if is_u */
368.  	if (is_lava(x, y))
369.  		return (boolean)((is_u(etmp) && (Levitation || Flying)) ||
370.  			    likes_lava(etmp->edata) || is_flyer(etmp->edata));
371.  	if (is_db_wall(x, y))
372.  		return((boolean)(is_u(etmp) ? Passes_walls :
373.  			passes_walls(etmp->edata)));
374.  	return(TRUE);
375.  }
376.  

e_died

377.  STATIC_OVL void
378.  e_died(etmp, dest, how)
379.  struct entity *etmp;
380.  int dest, how;
381.  {
382.  	if (is_u(etmp)) {
383.  		if (how == DROWNING) {
384.  			killer = 0;	/* drown() sets its own killer */
385.  			(void) drown();
386.  		} else if (how == BURNING) {
387.  			killer = 0;	/* lava_effects() sets its own killer */
388.  			(void) lava_effects();
389.  		} else {
390.  			coord xy;
391.  
392.  			/* use more specific killer if specified */
393.  			if (!killer) {
394.  			    killer_format = KILLED_BY_AN;
395.  			    killer = "falling drawbridge";
396.  			}
397.  			done(how);
398.  			/* So, you didn't die */
399.  			if (!e_survives_at(etmp, etmp->ex, etmp->ey)) {
400.  			    if (enexto(&xy, etmp->ex, etmp->ey, etmp->edata)) {
401.  				pline("A %s force teleports you away...",
402.  				      Hallucination ? "normal" : "strange");
403.  				teleds(xy.x, xy.y, FALSE);
404.  			    }
405.  			    /* otherwise on top of the drawbridge is the
406.  			     * only viable spot in the dungeon, so stay there
407.  			     */
408.  			}
409.  		}
410.  		/* we might have crawled out of the moat to survive */
411.  		etmp->ex = u.ux,  etmp->ey = u.uy;
412.  	} else {
413.  		int entitycnt;
414.  
415.  		killer = 0;
416.  		/* fake "digested to death" damage-type suppresses corpse */
417.  #define mk_message(dest) ((dest & 1) ? "" : (char *)0)
418.  #define mk_corpse(dest)  ((dest & 2) ? AD_DGST : AD_PHYS)
419.  		/* if monsters are moving, one of them caused the destruction */
420.  		if (flags.mon_moving)
421.  		    monkilled(etmp->emon, mk_message(dest), mk_corpse(dest));
422.  		else		/* you caused it */
423.  		    xkilled(etmp->emon, dest);
424.  		etmp->edata = (struct permonst *)0;
425.  
426.  		/* dead long worm handling */
427.  		for (entitycnt = 0; entitycnt < ENTITIES; entitycnt++) {
428.  		    if (etmp != &(occupants[entitycnt]) &&
429.  			etmp->emon == occupants[entitycnt].emon)
430.  			occupants[entitycnt].edata = (struct permonst *)0;
431.  		}
432.  #undef mk_message
433.  #undef mk_corpse
434.  	}
435.  }
436.  
437.  

automiss

438.  /*
439.   * These are never directly affected by a bridge or portcullis.
440.   */
441.  
442.  STATIC_OVL boolean
443.  automiss(etmp)
444.  struct entity *etmp;
445.  {
446.  	return (boolean)((is_u(etmp) ? Passes_walls :
447.  			passes_walls(etmp->edata)) || noncorporeal(etmp->edata));
448.  }
449.  

e_missed

450.  /*
451.   * Does falling drawbridge or portcullis miss etmp?
452.   */
453.  
454.  STATIC_OVL boolean
455.  e_missed(etmp, chunks)
456.  struct entity *etmp;
457.  boolean chunks;
458.  {
459.  	int misses;
460.  
461.  #ifdef D_DEBUG
462.  	if (chunks)
463.  		pline("Do chunks miss?");
464.  #endif
465.  	if (automiss(etmp))
466.  		return(TRUE);
467.  
468.  	if (is_flyer(etmp->edata) &&
469.  	    (is_u(etmp)? !Sleeping :
470.  	     (etmp->emon->mcanmove && !etmp->emon->msleeping)))
471.  						 /* flying requires mobility */
472.  		misses = 5;	/* out of 8 */
473.  	else if (is_floater(etmp->edata) ||
474.  		    (is_u(etmp) && Levitation))	 /* doesn't require mobility */
475.  		misses = 3;
476.  	else if (chunks && is_pool(etmp->ex, etmp->ey))
477.  		misses = 2;				    /* sitting ducks */
478.  	else
479.  		misses = 0;
480.  
481.  	if (is_db_wall(etmp->ex, etmp->ey))
482.  		misses -= 3;				    /* less airspace */
483.  
484.  #ifdef D_DEBUG
485.  	pline("Miss chance = %d (out of 8)", misses);
486.  #endif
487.  
488.  	return((boolean)((misses >= rnd(8))? TRUE : FALSE));
489.  }
490.  

e_jumps

491.  /*
492.   * Can etmp jump from death?
493.   */
494.  
495.  STATIC_OVL boolean
496.  e_jumps(etmp)
497.  struct entity *etmp;
498.  {
499.  	int tmp = 4;		/* out of 10 */
500.  
501.  	if (is_u(etmp)? (Sleeping || Fumbling) :
502.  		        (!etmp->emon->mcanmove || etmp->emon->msleeping ||
503.  			 !etmp->edata->mmove   || etmp->emon->wormno))
504.  		return(FALSE);
505.  
506.  	if (is_u(etmp)? Confusion : etmp->emon->mconf)
507.  		tmp -= 2;
508.  
509.  	if (is_u(etmp)? Stunned : etmp->emon->mstun)
510.  		tmp -= 3;
511.  
512.  	if (is_db_wall(etmp->ex, etmp->ey))
513.  		tmp -= 2;			    /* less room to maneuver */
514.  
515.  #ifdef D_DEBUG
516.  	pline("%s to jump (%d chances in 10)", E_phrase(etmp, "try"), tmp);
517.  #endif
518.  	return((boolean)((tmp >= rnd(10))? TRUE : FALSE));
519.  }
520.  

do_entitity

521.  STATIC_OVL void
522.  do_entity(etmp)
523.  struct entity *etmp;
524.  {
525.  	int newx, newy, at_portcullis, oldx, oldy;
526.  	boolean must_jump = FALSE, relocates = FALSE, e_inview;
527.  	struct rm *crm;
528.  
529.  	if (!etmp->edata)
530.  		return;
531.  
532.  	e_inview = e_canseemon(etmp);
533.  	oldx = etmp->ex;
534.  	oldy = etmp->ey;
535.  	at_portcullis = is_db_wall(oldx, oldy);
536.  	crm = &levl[oldx][oldy];
537.  
538.  	if (automiss(etmp) && e_survives_at(etmp, oldx, oldy)) {
539.  		if (e_inview && (at_portcullis || IS_DRAWBRIDGE(crm->typ)))
540.  			pline_The("%s passes through %s!",
541.  			      at_portcullis ? "portcullis" : "drawbridge",
542.  			      e_nam(etmp));
543.  		if (is_u(etmp)) spoteffects(FALSE);
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.  

close_drawbridge

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.  

open_drawbridge

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.  

destroy_drawbridge

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*/