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Source:NetHack 3.1.0/dbridge.c

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Below is the full text to dbridge.c from the source code of NetHack 3.1.0. To link to a particular line, write [[NetHack 3.1.0/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	3.1	92/10/24	*/
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 void FDECL(get_wall_for_db, (int *, int *));
17.   static struct entity *FDECL(e_at, (int, int));
18.   static void FDECL(m_to_e, (struct monst *, XCHAR_P, XCHAR_P, struct entity *));
19.   static void FDECL(u_to_e, (struct entity *));
20.   static void FDECL(set_entity, (int, int, struct entity *));
21.   static char *FDECL(e_nam, (struct entity *));
22.   #ifdef D_DEBUG
23.   static char *FDECL(Enam, (struct entity *)); /* unused */
24.   #endif
25.   static char *FDECL(E_phrase, (struct entity *, const char *));
26.   static boolean FDECL(e_survives_at, (struct entity *, int, int));
27.   static void FDECL(e_died, (struct entity *, int, int));
28.   static boolean FDECL(automiss, (struct entity *));
29.   static boolean FDECL(e_missed, (struct entity *, BOOLEAN_P));
30.   static boolean FDECL(e_jumps, (struct entity *));
31.   static 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( 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 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].diggable = 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 struct entity NEARDATA occupants[ENTITIES];
227.  
228.  static
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 void
249.  m_to_e(mtmp, x, y, etmp)
250.  struct monst *mtmp;
251.  xchar 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 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 = uasmon;
274.  }
275.  
276.  static 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
284.  		if (MON_AT(x, y))
285.  			m_to_e(m_at(x, y), x, y, etmp);
286.  		else
287.  			etmp->edata = (struct permonst *)0;
288.  }
289.  
290.  #define is_u(etmp) (etmp->emon == &youmonst)
291.  #define e_canseemon(etmp) (is_u(etmp) ? (boolean)TRUE : canseemon(etmp->emon)) 
292.  
293.  /*
294.   * e_strg is a utility routine which is not actually in use anywhere, since 
295.   * the specialized routines below suffice for all current purposes. 
296.   */
297.  
298.  /* #define e_strg(etmp, func) (is_u(etmp)? (char *)0 : func(etmp->emon)) */
299.  
300.  static char *
301.  e_nam(etmp)
302.  struct entity *etmp;
303.  {
304.  	return(is_u(etmp)? "you" : mon_nam(etmp->emon));
305.  }
306.  
307.  #ifdef D_DEBUG
308.  /*
309.   * Enam is another unused utility routine:  E_phrase is preferable.
310.   */
311.  
312.  static char *
313.  Enam(etmp)
314.  struct entity *etmp;
315.  {
316.  	return(is_u(etmp)? "You" : Monnam(etmp->emon));
317.  }
318.  #endif /* D_DEBUG */
319.  
320.  /*
321.   * Generates capitalized entity name, makes 2nd -> 3rd person conversion on 
322.   * verb, where necessary.
323.   */
324.  
325.  static char *
326.  E_phrase(etmp, verb)
327.  struct entity *etmp;
328.  const char *verb;
329.  {
330.  	static char wholebuf[80];
331.  	char verbbuf[30];
332.  
333.  	if (is_u(etmp)) 
334.  		Strcpy(wholebuf, "You");
335.  	else
336.  		Strcpy(wholebuf, Monnam(etmp->emon));
337.  	if (!*verb)
338.  		return(wholebuf);
339.  	Strcat(wholebuf, " ");
340.  	verbbuf[0] = '\0';
341.  	if (is_u(etmp)) 
342.  		Strcpy(verbbuf, verb);
343.  	else {
344.  		if (!strcmp(verb, "are"))
345.  			Strcpy(verbbuf, "is");
346.  		if (!strcmp(verb, "have"))
347.  			Strcpy(verbbuf, "has");
348.  		if (!verbbuf[0]) {
349.  			Strcpy(verbbuf, verb);
350.  			switch (verbbuf[strlen(verbbuf) - 1]) {
351.  				case 'y':
352.  					verbbuf[strlen(verbbuf) - 1] = '\0';
353.  					Strcat(verbbuf, "ies");
354.  					break;
355.  				case 'h':
356.  				case 'o':
357.  				case 's':
358.  					Strcat(verbbuf, "es");
359.  					break;
360.  				default:
361.  					Strcat(verbbuf, "s");
362.  					break;
363.  			}
364.  		}
365.  	}
366.  	Strcat(wholebuf, verbbuf);
367.  	return(wholebuf);
368.  }
369.  
370.  /*
371.   * Simple-minded "can it be here?" routine
372.   */
373.  
374.  static boolean
375.  e_survives_at(etmp, x, y)
376.  struct entity *etmp;
377.  int x, y;
378.  {
379.  	if (noncorporeal(etmp->edata))
380.  		return(TRUE);
381.  	if (is_pool(x, y))
382.  		return((is_u(etmp) && (Wwalking || Magical_breathing || Levitation)) ||
383.  		       is_swimmer(etmp->edata) || is_flyer(etmp->edata) ||
384.  		       is_floater(etmp->edata));
385.  	/* must force call to lava_effects in e_died if is_u */
386.  	if (is_lava(x, y))
387.  		return(is_u(etmp) ? !!Levitation : resists_fire(etmp->edata));
388.  	if (is_db_wall(x, y))
389.  		return(passes_walls(etmp->edata));
390.  	return(TRUE);
391.  }
392.  
393.  static 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.  		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,
412.  							    etmp->edata)) {
413.  				pline("A %s force teleports you away...",
414.  				      Hallucination ? "normal" : "strange");
415.  				teleds(xy.x, xy.y);
416.  			    }
417.  			    /* otherwise on top of the drawbridge is the
418.  			     * only viable spot in the dungeon, so stay there
419.  			     */
420.  			}
421.  		}
422.  	} else {
423.  		xkilled(etmp->emon, dest);
424.  		etmp->edata = (struct permonst *)0;	
425.  	}
426.  }
427.  
428.  
429.  /*
430.   * These are never directly affected by a bridge or portcullis.
431.   */
432.  
433.  static boolean
434.  automiss(etmp)
435.  struct entity *etmp;
436.  {
437.  	return(passes_walls(etmp->edata) || noncorporeal(etmp->edata));
438.  }
439.  
440.  /*
441.   * Does falling drawbridge or portcullis miss etmp?
442.   */
443.  
444.  static boolean
445.  e_missed(etmp, chunks)
446.  struct entity *etmp;
447.  boolean chunks;
448.  {
449.  	int misses;
450.  
451.  #ifdef D_DEBUG
452.  	if (chunks)
453.  		pline("Do chunks miss?");
454.  #endif
455.  	if (automiss(etmp))
456.  		return(TRUE);	
457.  
458.  	if (is_flyer(etmp->edata) && 
459.  	    (is_u(etmp)? !Sleeping : 
460.  	     (etmp->emon->mcanmove && !etmp->emon->msleep)))
461.  						 /* flying requires mobility */
462.  		misses = 5;	/* out of 8 */	
463.  	else
464.  		if (is_floater(etmp->edata) ||
465.  		    (is_u(etmp) && Levitation))	 /* doesn't require mobility */
466.  			misses = 3;
467.  		else
468.  			if (chunks && is_pool(etmp->ex, etmp->ey))
469.  				misses = 2; 		    /* sitting ducks */
470.  			else
471.  				misses = 0;	  
472.  
473.  	if (is_db_wall(etmp->ex, etmp->ey))
474.  		misses -= 3;				    /* less airspace */
475.  
476.  #ifdef D_DEBUG
477.  	pline("Miss chance = %d (out of 8)", misses);
478.  #endif
479.  
480.  	return((misses >= rnd(8))? TRUE : FALSE);
481.  }
482.  
483.  /*
484.   * Can etmp jump from death?
485.   */ 
486.  
487.  static boolean
488.  e_jumps(etmp)
489.  struct entity *etmp;
490.  {
491.  	int tmp = 4; 		/* out of 10 */
492.  
493.  	if (is_u(etmp)? (Sleeping || Fumbling) : 
494.  		        (!etmp->emon->mcanmove || etmp->emon->msleep || 
495.  			 !etmp->edata->mmove   || etmp->emon->wormno))
496.  		return(FALSE);
497.  
498.  	if (is_u(etmp)? Confusion : etmp->emon->mconf)
499.  		tmp -= 2;
500.  
501.  	if (is_u(etmp)? Stunned : etmp->emon->mstun)
502.  		tmp -= 3;
503.  
504.  	if (is_db_wall(etmp->ex, etmp->ey))
505.  		tmp -= 2;			    /* less room to maneuver */
506.  	
507.  #ifdef D_DEBUG
508.  	pline("%s to jump (%d chances in 10)", E_phrase(etmp, "try"), tmp);
509.  #endif
510.  	return((tmp >= rnd(10))? TRUE : FALSE);
511.  }
512.  
513.  static void
514.  do_entity(etmp)
515.  struct entity *etmp;
516.  {
517.  	int newx, newy, at_portcullis, oldx, oldy;
518.  	boolean must_jump = FALSE, relocates = FALSE, e_inview;
519.  	struct rm *crm;
520.  
521.  	if (!etmp->edata)
522.  		return;
523.  
524.  	e_inview = e_canseemon(etmp);
525.  
526.  	oldx = etmp->ex;
527.  	oldy = etmp->ey;
528.  
529.  	at_portcullis = is_db_wall(oldx, oldy);
530.  
531.  	crm = &levl[oldx][oldy];
532.  
533.  	if (automiss(etmp) && e_survives_at(etmp, oldx, oldy)) {
534.  		char edifice[20];
535.  
536.  		if (e_inview) {
537.  			*edifice = '\0';
538.  			if ((crm->typ == DRAWBRIDGE_DOWN) ||
539.  		    	    (crm->typ == DRAWBRIDGE_UP))
540.  				Strcpy(edifice, "drawbridge");
541.  			else
542.       				if (at_portcullis) 
543.  					Strcpy(edifice, "portcullis");
544.  			if (*edifice)
545.  				pline("The %s passes through %s!", edifice, 
546.  			      	      e_nam(etmp));			
547.  		}
548.  		return;
549.  	}
550.  	if (e_missed(etmp, FALSE)) { 
551.  		if (at_portcullis)
552.  			pline("The portcullis misses %s!",
553.  			      e_nam(etmp));
554.  #ifdef D_DEBUG
555.  		else
556.  			pline("The drawbridge misses %s!", 
557.  			      e_nam(etmp));
558.  #endif
559.  		if (e_survives_at(etmp, oldx, oldy)) 
560.  			return;
561.  		else {
562.  #ifdef D_DEBUG
563.  			pline("Mon can't survive here");
564.  #endif
565.  			if (at_portcullis)
566.  				must_jump = TRUE;
567.  			else
568.  				relocates = TRUE; /* just ride drawbridge in */
569.  		}
570.  	} else {
571.  		if (crm->typ == DRAWBRIDGE_DOWN) {
572.  			pline("%s crushed underneath the drawbridge.",
573.  		      	      E_phrase(etmp, "are"));	   	  /* no jump */
574.  			e_died(etmp, e_inview? 3 : 2, CRUSHING);/* no corpse */
575.  			return;   /* Note: Beyond this point, we know we're  */
576.  		}                 /* not at an opened drawbridge, since all  */
577.  		must_jump = TRUE; /* *missable* creatures survive on the     */
578.  	}			  /* square, and all the unmissed ones die.  */
579.  	if (must_jump) {
580.  	    if (at_portcullis) {
581.  		if (e_jumps(etmp)) {
582.  		    relocates = TRUE;
583.  #ifdef D_DEBUG
584.  		    pline("Jump succeeds!");
585.  #endif
586.  		} else {
587.  		    if (e_inview)
588.  			pline("%s crushed by the falling portcullis!",
589.  			      E_phrase(etmp, "are"));
590.  		    else if (flags.soundok)
591.  			You("hear a crushing sound.");
592.  		    e_died(etmp, e_inview? 3 : 2, CRUSHING);
593.  		    /* no corpse */
594.  		    return;
595.  		}
596.  	    } else { /* tries to jump off bridge to original square */
597.  		relocates = !e_jumps(etmp); 
598.  #ifdef D_DEBUG
599.  		pline("Jump %s!", (relocates)? "fails" : "succeeds");
600.  #endif
601.  	    }
602.  	}
603.  
604.  /*
605.   * Here's where we try to do relocation.  Assumes that etmp is not arriving
606.   * at the portcullis square while the drawbridge is falling, since this square
607.   * would be inaccessible (i.e. etmp started on drawbridge square) or 
608.   * unnecessary (i.e. etmp started here) in such a situation.
609.   */
610.  #ifdef D_DEBUG
611.  	pline("Doing relocation.");
612.  #endif
613.  	newx = oldx;
614.  	newy = oldy;
615.  	(void)find_drawbridge(&newx, &newy);
616.  	if ((newx == oldx) && (newy == oldy))
617.  		get_wall_for_db(&newx, &newy);
618.  #ifdef D_DEBUG
619.  	pline("Checking new square for occupancy.");
620.  #endif
621.  	if (relocates && (e_at(newx, newy))) { 
622.  
623.  /* 
624.   * Standoff problem:  one or both entities must die, and/or both switch 
625.   * places.  Avoid infinite recursion by checking first whether the other 
626.   * entity is staying put.  Clean up if we happen to move/die in recursion.
627.   */
628.  		struct entity *other;
629.  
630.  		other = e_at(newx, newy);
631.  #ifdef D_DEBUG
632.  		pline("New square is occupied by %s", e_nam(other));
633.  #endif
634.  		if (e_survives_at(other, newx, newy) && automiss(other)) {
635.  			relocates = FALSE;     	      /* "other" won't budge */
636.  #ifdef D_DEBUG
637.  			pline("%s suicide.", E_phrase(etmp, "commit"));
638.  #endif
639.  		} else {
640.  
641.  #ifdef D_DEBUG
642.  			pline("Handling %s", e_nam(other));
643.  #endif
644.  			while ((e_at(newx, newy)) && 
645.  			       (e_at(newx, newy) != etmp))
646.  		       		do_entity(other);
647.  #ifdef D_DEBUG
648.  			pline("Checking existence of %s", e_nam(etmp));
649.  			wait_synch();
650.  #endif
651.  			if (e_at(oldx, oldy) != etmp) {
652.  #ifdef D_DEBUG
653.  			    pline("%s moved or died in recursion somewhere",
654.  				  E_phrase(etmp, "have"));
655.  			    wait_synch();
656.  #endif
657.  			    return;
658.  			}
659.  		}
660.  	}
661.  	if (relocates && !e_at(newx, newy)) {/* if e_at() entity = worm tail */
662.  #ifdef D_DEBUG
663.  		pline("Moving %s", e_nam(etmp));
664.  #endif
665.  		if (!is_u(etmp)) {
666.  			remove_monster(etmp->ex, etmp->ey);
667.  			place_monster(etmp->emon, newx, newy);
668.  		} else {
669.  			u.ux = newx;
670.  			u.uy = newy;
671.  		}
672.  		etmp->ex = newx;
673.  		etmp->ey = newy;
674.  		e_inview = e_canseemon(etmp);
675.  	}
676.  #ifdef D_DEBUG
677.  	pline("Final disposition of %s", e_nam(etmp));
678.  	wait_synch();
679.  #endif
680.  	if (is_db_wall(etmp->ex, etmp->ey)) {
681.  #ifdef D_DEBUG
682.  		pline("%s in portcullis chamber", E_phrase(etmp, "are"));
683.  		wait_synch();
684.  #endif
685.  		if (e_inview) {
686.  			if (is_u(etmp)) {
687.  				You("tumble towards the closed portcullis!"); 
688.  				if (automiss(etmp))
689.  					You("pass through it!");
690.  				else
691.  					pline("The drawbridge closes in...");
692.  			} else
693.  				pline("%s behind the drawbridge.",
694.  		      	      	      E_phrase(etmp, "disappear"));
695.  		}
696.  		if (!e_survives_at(etmp, etmp->ex, etmp->ey)) {
697.  			killer_format = KILLED_BY_AN;
698.  			killer = "closing drawbridge";
699.  			e_died(etmp, 0, CRUSHING); 	       /* no message */
700.  			return;
701.  		}
702.  #ifdef D_DEBUG
703.  		pline("%s in here", E_phrase(etmp, "survive"));
704.  #endif
705.  	} else {
706.  #ifdef D_DEBUG
707.  		pline("%s on drawbridge square", E_phrase(etmp, "are"));
708.  #endif
709.  		if (is_pool(etmp->ex, etmp->ey) && !e_inview)
710.  			if (flags.soundok)
711.  				You("hear a splash.");
712.  		if (e_survives_at(etmp, etmp->ex, etmp->ey)) {
713.  			if (e_inview && !is_flyer(etmp->edata) &&
714.  			    !is_floater(etmp->edata))
715.  				pline("%s from the bridge.",
716.  		      	      	      E_phrase(etmp, "fall"));	
717.  			return;	
718.  		}
719.  #ifdef D_DEBUG
720.  		pline("%s cannot survive on the drawbridge square",Enam(etmp));
721.  #endif
722.  		if (is_pool(etmp->ex, etmp->ey) || is_lava(etmp->ex, etmp->ey))
723.  		    if (e_inview && !is_u(etmp)) {
724.  			/* drown() will supply msgs if nec. */
725.  			boolean lava = is_lava(etmp->ex, etmp->ey);
726.  
727.  			if (Hallucination)
728.  			    pline("%s the %s and disappears.",
729.  				  E_phrase(etmp, "drink"),
730.  				  lava ? "lava" : "moat");
731.  			else
732.  			    pline("%s into the %s.",
733.  				  E_phrase(etmp, "fall"),
734.  				  lava ? "lava" : "moat");
735.  		    }
736.  		killer_format = NO_KILLER_PREFIX;
737.  		killer = "fell from a drawbridge";
738.  		e_died(etmp, e_inview ? 3 : 2,      /* CRUSHING is arbitrary */
739.  		       (is_pool(etmp->ex, etmp->ey)) ? DROWNING :
740.  		       (is_lava(etmp->ex, etmp->ey)) ? BURNING :
741.  						       CRUSHING); /*no corpse*/
742.  		return;
743.  	}
744.  }
745.  
746.  /*
747.   * Close the drawbridge located at x,y
748.   */
749.  
750.  void
751.  close_drawbridge(x,y)
752.  int x,y;
753.  {
754.  	register struct rm *lev1, *lev2;
755.  	int x2, y2;
756.  
757.  	lev1 = &levl[x][y];
758.  	if (lev1->typ != DRAWBRIDGE_DOWN) return;
759.  	x2 = x; y2 = y;
760.  	get_wall_for_db(&x2,&y2);
761.  	if (cansee(x,y))  /* change msgs if you are a w-walker at portcullis */
762.  		You("see a drawbridge %s up!", 
763.  		    ((u.ux == x2) && (u.uy == y2))? "coming" : "going");
764.  	lev1->typ = DRAWBRIDGE_UP;
765.  	lev2 = &levl[x2][y2];
766.  	lev2->typ = DBWALL;
767.  	switch (lev1->drawbridgemask & DB_DIR) {
768.  		case DB_NORTH:
769.  		case DB_SOUTH:
770.  			lev2->horizontal = TRUE;
771.  			break;
772.  		case DB_WEST:
773.  		case DB_EAST:
774.  			lev2->horizontal = FALSE;
775.  			break;
776.  	}
777.  	lev2->diggable = W_NONDIGGABLE;
778.  	set_entity(x, y, &(occupants[0]));
779.  	set_entity(x2, y2, &(occupants[1]));
780.  	do_entity(&(occupants[0]));		/* Do set_entity after first */
781.  	set_entity(x2, y2, &(occupants[1]));	/* do_entity for worm tail */
782.  	do_entity(&(occupants[1]));
783.  	if(OBJ_AT(x,y) && flags.soundok)
784.  	    You("hear smashing and crushing.");
785.  	(void) revive_nasty(x,y,NULL);
786.  	(void) revive_nasty(x2,y2,NULL);
787.  	delallobj(x, y);
788.  	newsym(x, y);
789.  	delallobj(x2, y2);
790.  	newsym(x2, y2);
791.  	block_point(x2,y2);	/* vision */
792.  }
793.  
794.  /* 
795.   * Open the drawbridge located at x,y
796.   */
797.  
798.  void
799.  open_drawbridge(x,y)
800.  int x,y;
801.  {
802.  	register struct rm *lev1, *lev2;
803.  	int x2, y2;
804.  
805.  	lev1 = &levl[x][y];
806.  	if (lev1->typ != DRAWBRIDGE_UP) return;
807.  	x2 = x; y2 = y;
808.  	get_wall_for_db(&x2,&y2);
809.  	if (cansee(x,y))  /* change msgs if you are a w-walker at portcullis */
810.  		You("see a drawbridge %s down!",
811.  		    ((x2 == u.ux) && (y2 == u.uy))? "going" : "coming");
812.  	lev1->typ = DRAWBRIDGE_DOWN;
813.  	lev2 = &levl[x2][y2];
814.  	lev2->typ = DOOR;
815.  	lev2->doormask = D_NODOOR;
816.  	set_entity(x, y, &(occupants[0]));
817.  	set_entity(x2, y2, &(occupants[1]));
818.  	do_entity(&(occupants[0]));		/* do set_entity after first */
819.  	set_entity(x2, y2, &(occupants[1]));	/* do_entity for worm tails */
820.  	do_entity(&(occupants[1]));
821.  	spoteffects();  /* if underwater, hero is now on solid ground */
822.  	(void) revive_nasty(x,y,NULL);
823.  	delallobj(x, y);
824.  	newsym(x, y);
825.  	newsym(x2, y2);
826.  	unblock_point(x2,y2);	/* vision */
827.  	if (Is_stronghold(&u.uz)) u.uevent.uopened_dbridge = TRUE;
828.  }
829.  
830.  /*
831.   * Let's destroy the drawbridge located at x,y
832.   */
833.  
834.  void
835.  destroy_drawbridge(x,y)
836.  int x,y;
837.  {
838.  	register struct rm *lev1, *lev2;
839.  	int x2, y2;
840.  	boolean e_inview;
841.  	struct entity *etmp1 = &(occupants[0]), *etmp2 = &(occupants[1]);
842.  
843.  	lev1 = &levl[x][y];
844.  	if (!IS_DRAWBRIDGE(lev1->typ))
845.  		return;
846.  	x2 = x; y2 = y;
847.  	get_wall_for_db(&x2,&y2);
848.  	lev2 = &levl[x2][y2];
849.  	if ((lev1->drawbridgemask & DB_UNDER) == DB_MOAT ||
850.  	    (lev1->drawbridgemask & DB_UNDER) == DB_LAVA) {
851.  		struct obj *otmp;
852.  		boolean lava = (lev1->drawbridgemask & DB_UNDER) == DB_LAVA;
853.  		if (lev1->typ == DRAWBRIDGE_UP) {
854.  			if (cansee(x2,y2))
855.  			    pline("The portcullis of the drawbridge falls into the %s!",
856.  				  lava ? "lava" : "moat");
857.  			else if (flags.soundok)
858.  				You("hear a loud *SPLASH*!");
859.  		} else {
860.  			if (cansee(x,y))
861.  			    pline("The drawbridge collapses into the %s!",
862.  				  lava ? "lava" : "moat");
863.  			else if (flags.soundok)
864.  				You("hear a loud *SPLASH*!");
865.  		}
866.  		lev1->typ = lava ? LAVAPOOL : MOAT;
867.  		lev1->drawbridgemask = 0;
868.  		if(otmp = sobj_at(BOULDER,x,y)) {
869.  		    freeobj(otmp);
870.  		    (void) flooreffects(otmp,x,y,"fall");
871.  		}
872.  	} else {
873.  		if (cansee(x,y))
874.  			pline("The drawbridge disintegrates!");
875.  		else
876.  			You("hear a loud *CRASH*!");
877.  		lev1->typ =
878.  			((lev1->drawbridgemask & DB_ICE) ? ICE : ROOM);
879.  		lev1->icedpool =
880.  			((lev1->drawbridgemask & DB_ICE) ? ICED_MOAT : 0);
881.  	}
882.  	wake_nearby();
883.  	lev2->typ = DOOR;
884.  	lev2->doormask = D_NODOOR;
885.  	newsym(x,y);
886.  	newsym(x2,y2);
887.  	if (!does_block(x2,y2,lev2)) unblock_point(x2,y2);	/* vision */
888.  	if (Is_stronghold(&u.uz)) u.uevent.uopened_dbridge = TRUE;
889.  
890.  	set_entity(x2, y2, etmp2); /* currently only automissers can be here */
891.  	if (etmp2->edata) {
892.  		e_inview = e_canseemon(etmp2);
893.  		if (!automiss(etmp2)) {
894.  			if (e_inview)
895.  				pline("%s blown apart by flying debris.",
896.  			      	      E_phrase(etmp2, "are"));
897.  			killer_format = KILLED_BY_AN;
898.  			killer = "exploding drawbridge";
899.  			e_died(etmp2, e_inview? 3 : 2, CRUSHING); /*no corpse*/
900.  		}	     /* nothing which is vulnerable can survive this */
901.  	}
902.  	set_entity(x, y, etmp1);
903.  	if (etmp1->edata) {
904.  		e_inview = e_canseemon(etmp1);
905.  		if (e_missed(etmp1, TRUE)) {
906.  #ifdef D_DEBUG
907.  			pline("%s spared!", E_phrase(etmp1, "are"));
908.  #endif
909.  		} else {
910.  			if (e_inview) {
911.  			    if (!is_u(etmp1) && Hallucination)
912.  				pline("%s into some heavy metal",
913.  				      E_phrase(etmp1, "get"));
914.  			    else
915.  				pline("%s hit by a huge chunk of metal!",
916.  				      E_phrase(etmp1, "are"));
917.  			} else {
918.  			    if (flags.soundok && !is_u(etmp1) && !is_pool(x,y))
919.  				You("hear a crushing sound");
920.  #ifdef D_DEBUG
921.  			    else
922.  				pline("%s from shrapnel", 
923.  				      E_phrase(etmp1, "die"));
924.  #endif
925.  			}
926.  			killer_format = KILLED_BY_AN;
927.  			killer = "collapsing drawbridge";
928.  			e_died(etmp1, e_inview? 3 : 2, CRUSHING); /*no corpse*/
929.  			if(lev1->typ == MOAT) do_entity(etmp1);
930.  		}
931.  	}
932.  }
933.  
934.  
935.  #endif /* OVLB */
936.  
937.  /*dbridge.c*/

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