Source:NetHack 3.3.0/region.c

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Below is the full text to region.c from the source code of NetHack 3.3.0. To link to a particular line, write [[NetHack 3.3.0/region.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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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.

1.    /*	SCCS Id: @(#)region.c	3.3	1999/11/29	*/
2.    /* Copyright (c) 1996 by Jean-Christophe Collet	 */
3.    /* NetHack may be freely redistributed.  See license for details. */
4.    
5.    #include "hack.h"
6.    
7.    /*
8.     * This should really go into the level structure, but
9.     * I'll start here for ease. It *WILL* move into the level
10.    * structure eventually.
11.    */
12.   
13.   static NhRegion **regions;
14.   static int n_regions = 0;
15.   static int max_regions = 0;
16.   
17.   #define NO_CALLBACK (-1)
18.   
19.   boolean FDECL(inside_gas_cloud, (genericptr,genericptr));
20.   boolean FDECL(expire_gas_cloud, (genericptr,genericptr));
21.   boolean FDECL(inside_rect, (NhRect *,int,int));
22.   boolean FDECL(inside_region, (NhRegion *,int,int));
23.   NhRegion *FDECL(create_region, (NhRect *,int));
24.   void FDECL(add_rect_to_reg, (NhRegion *,NhRect *));
25.   void FDECL(add_mon_to_reg, (NhRegion *,struct monst *));
26.   void FDECL(remove_mon_from_reg, (NhRegion *,struct monst *));
27.   boolean FDECL(mon_in_region, (NhRegion *,struct monst *));
28.   
29.   #if 0
30.   NhRegion *FDECL(clone_region, (NhRegion *));
31.   #endif
32.   void FDECL(free_region, (NhRegion *));
33.   void FDECL(add_region, (NhRegion *));
34.   void FDECL(remove_region, (NhRegion *));
35.   
36.   #if 0
37.   void FDECL(replace_mon_regions, (struct monst *,struct monst *));
38.   void FDECL(remove_mon_from_regions, (struct monst *));
39.   NhRegion *FDECL(create_msg_region, (XCHAR_P,XCHAR_P,XCHAR_P,XCHAR_P,
40.   				    const char *,const char *));
41.   boolean FDECL(enter_force_field, (genericptr,genericptr));
42.   NhRegion *FDECL(create_force_field, (XCHAR_P,XCHAR_P,int,int));
43.   #endif
44.   
45.   
46.   static callback_proc callbacks[] = {
47.   #define INSIDE_GAS_CLOUD 0
48.       inside_gas_cloud,
49.   #define EXPIRE_GAS_CLOUD 1
50.       expire_gas_cloud
51.   };
52.   
53.   extern struct monst *find_mid();
54.   
55.   /* Should be inlined. */
56.   boolean
57.   inside_rect(r, x, y)
58.   NhRect *r;
59.   int x, y;
60.   {
61.       return (x >= r->lx && x <= r->hx && y >= r->ly && y <= r->hy);
62.   }
63.   
64.   /*
65.    * Check if a point is inside a region.
66.    */
67.   boolean
68.   inside_region(reg, x, y)
69.   NhRegion *reg;
70.   int x, y;
71.   {
72.       int i;
73.   
74.       if (reg == NULL || !inside_rect(&(reg->bounding_box), x, y))
75.   	return FALSE;
76.       for (i = 0; i < reg->nrects; i++)
77.   	if (inside_rect(&(reg->rects[i]), x, y))
78.   	    return TRUE;
79.       return FALSE;
80.   }
81.   
82.   /*
83.    * Create a region. It does not activate it.
84.    */
85.   NhRegion *
86.   create_region(rects, nrect)
87.   NhRect *rects;
88.   int nrect;
89.   {
90.       int i;
91.       NhRegion *reg;
92.   
93.       reg = (NhRegion *) alloc(sizeof (NhRegion));
94.       /* Determines bounding box */
95.       if (nrect > 0) {
96.   	reg->bounding_box = rects[0];
97.       } else {
98.   	reg->bounding_box.lx = 99;
99.   	reg->bounding_box.ly = 99;
100.  	reg->bounding_box.hx = 0;
101.  	reg->bounding_box.hy = 0;
102.      }
103.      reg->nrects = nrect;
104.      reg->rects = nrect > 0 ? (NhRect *)alloc((sizeof (NhRect)) * nrect) : NULL;
105.      for (i = 0; i < nrect; i++) {
106.  	if (rects[i].lx < reg->bounding_box.lx)
107.  	    reg->bounding_box.lx = rects[i].lx;
108.  	if (rects[i].ly < reg->bounding_box.ly)
109.  	    reg->bounding_box.ly = rects[i].ly;
110.  	if (rects[i].hx > reg->bounding_box.hx)
111.  	    reg->bounding_box.hx = rects[i].hx;
112.  	if (rects[i].hy > reg->bounding_box.hy)
113.  	    reg->bounding_box.hy = rects[i].hy;
114.  	reg->rects[i] = rects[i];
115.      }
116.      reg->ttl = -1;		/* Defaults */
117.      reg->attach_2_u = FALSE;
118.      reg->attach_2_m = 0;
119.      /* reg->attach_2_o = NULL; */
120.      reg->enter_msg = NULL;
121.      reg->leave_msg = NULL;
122.      reg->expire_f = NO_CALLBACK;
123.      reg->enter_f = NO_CALLBACK;
124.      reg->can_enter_f = NO_CALLBACK;
125.      reg->leave_f = NO_CALLBACK;
126.      reg->can_leave_f = NO_CALLBACK;
127.      reg->inside_f = NO_CALLBACK;
128.      reg->player_inside = FALSE;
129.      reg->n_monst = 0;
130.      reg->max_monst = 0;
131.      reg->monsters = NULL;
132.      reg->arg = NULL;
133.      return reg;
134.  }
135.  
136.  /*
137.   * Add rectangle to region.
138.   */
139.  void
140.  add_rect_to_reg(reg, rect)
141.  NhRegion *reg;
142.  NhRect *rect;
143.  {
144.      NhRect *tmp_rect;
145.  
146.      tmp_rect = (NhRect *) alloc(sizeof (NhRect) * (reg->nrects + 1));
147.      if (reg->nrects > 0) {
148.  	(void) memcpy((genericptr_t) tmp_rect, (genericptr_t) reg->rects,
149.  		      (sizeof (NhRect) * reg->nrects));
150.  	free((genericptr_t) reg->rects);
151.      }
152.      tmp_rect[reg->nrects] = *rect;
153.      reg->nrects++;
154.      reg->rects = tmp_rect;
155.      /* Update bounding box if needed */
156.      if (reg->bounding_box.lx > rect->lx)
157.  	reg->bounding_box.lx = rect->lx;
158.      if (reg->bounding_box.ly > rect->ly)
159.  	reg->bounding_box.ly = rect->ly;
160.      if (reg->bounding_box.hx < rect->hx)
161.  	reg->bounding_box.hx = rect->hx;
162.      if (reg->bounding_box.hy < rect->hy)
163.  	reg->bounding_box.hy = rect->hy;
164.  }
165.  
166.  /*
167.   * Add a monster to the region
168.   */
169.  void
170.  add_mon_to_reg(reg, mon)
171.  NhRegion *reg;
172.  struct monst *mon;
173.  {
174.      int i;
175.      unsigned *tmp_m;
176.  
177.      if (reg->max_monst <= reg->n_monst) {
178.  	tmp_m = (unsigned *)
179.  		    alloc(sizeof (unsigned) * (reg->max_monst + MONST_INC));
180.  	if (reg->max_monst > 0) {
181.  	    for (i = 0; i < reg->max_monst; i++)
182.  		tmp_m[i] = reg->monsters[i];
183.  	    free((genericptr_t) reg->monsters);
184.  	}
185.  	reg->monsters = tmp_m;
186.  	reg->max_monst += MONST_INC;
187.      }
188.      reg->monsters[reg->n_monst++] = mon->m_id;
189.  }
190.  
191.  /*
192.   * Remove a monster from the region list (it left or died...)
193.   */
194.  void
195.  remove_mon_from_reg(reg, mon)
196.  NhRegion *reg;
197.  struct monst *mon;
198.  {
199.      register int i;
200.  
201.      for (i = 0; i < reg->n_monst; i++)
202.  	if (reg->monsters[i] == mon->m_id) {
203.  	    reg->n_monst--;
204.  	    reg->monsters[i] = reg->monsters[reg->n_monst];
205.  	    return;
206.  	}
207.  }
208.  
209.  /*
210.   * Check if a monster is inside the region.
211.   * It's probably quicker to check with the region internal list
212.   * than to check for coordinates.
213.   */
214.  boolean
215.  mon_in_region(reg, mon)
216.  NhRegion *reg;
217.  struct monst *mon;
218.  {
219.      int i;
220.  
221.      for (i = 0; i < reg->n_monst; i++)
222.  	if (reg->monsters[i] == mon->m_id)
223.  	    return TRUE;
224.      return FALSE;
225.  }
226.  
227.  #if 0
228.  /* not yet used */
229.  
230.  /*
231.   * Clone (make a standalone copy) the region.
232.   */
233.  NhRegion *
234.  clone_region(reg)
235.  NhRegion *reg;
236.  {
237.      NhRegion *ret_reg;
238.  
239.      ret_reg = create_region(reg->rects, reg->nrects);
240.      ret_reg->ttl = reg->ttl;
241.      ret_reg->attach_2_u = reg->attach_2_u;
242.      ret_reg->attach_2_m = reg->attach_2_m;
243.   /* ret_reg->attach_2_o = reg->attach_2_o; */
244.      ret_reg->expire_f = reg->expire_f;
245.      ret_reg->enter_f = reg->enter_f;
246.      ret_reg->can_enter_f = reg->can_enter_f;
247.      ret_reg->leave_f = reg->leave_f;
248.      ret_reg->can_leave_f = reg->can_leave_f;
249.      ret_reg->player_inside = reg->player_inside;
250.      ret_reg->n_monst = reg->n_monst;
251.      if (reg->n_monst > 0) {
252.  	ret_reg->monsters = (unsigned *)
253.  				alloc((sizeof (unsigned)) * reg->n_monst);
254.  	(void) memcpy((genericptr_t) ret_reg->monsters, (genericptr_t) reg->monsters,
255.  		      sizeof (unsigned) * reg->n_monst);
256.      } else
257.  	ret_reg->monsters = NULL;
258.      return ret_reg;
259.  }
260.  
261.  #endif	/*0*/
262.  
263.  /*
264.   * Free mem from region.
265.   */
266.  void
267.  free_region(reg)
268.  NhRegion *reg;
269.  {
270.      if (reg) {
271.  	if (reg->rects)
272.  	    free((genericptr_t) reg->rects);
273.  	if (reg->monsters)
274.  	    free((genericptr_t) reg->monsters);
275.  	free((genericptr_t) reg);
276.      }
277.  }
278.  
279.  /*
280.   * Add a region to the list.
281.   * This actually activates the region.
282.   */
283.  void
284.  add_region(reg)
285.  NhRegion *reg;
286.  {
287.      NhRegion **tmp_reg;
288.      int i, j;
289.  
290.      if (max_regions <= n_regions) {
291.  	tmp_reg = regions;
292.  	regions = (NhRegion **)alloc(sizeof (NhRegion *) * (max_regions + 10));
293.  	if (max_regions > 0) {
294.  	    (void) memcpy((genericptr_t) regions, (genericptr_t) tmp_reg,
295.  			  max_regions * sizeof (NhRegion *));
296.  	    free((genericptr_t) tmp_reg);
297.  	}
298.  	max_regions += 10;
299.      }
300.      regions[n_regions] = reg;
301.      n_regions++;
302.      /* Check for monsters inside the region */
303.      for (i = reg->bounding_box.lx; i <= reg->bounding_box.hx; i++)
304.  	for (j = reg->bounding_box.ly; j <= reg->bounding_box.hy; j++) {
305.  	    if (MON_AT(i, j) && inside_region(reg, i, j))
306.  		add_mon_to_reg(reg, level.monsters[i][j]);
307.  	    if (reg->visible && cansee(i, j))
308.  		newsym(i, j);
309.  	}
310.      /* Check for player now... */
311.      reg->player_inside = inside_region(reg, u.ux, u.uy);
312.  }
313.  
314.  /*
315.   * Remove a region from the list & free it.
316.   */
317.  void
318.  remove_region(reg)
319.  NhRegion *reg;
320.  {
321.      register int i, x, y;
322.  
323.      for (i = 0; i < n_regions; i++)
324.  	if (regions[i] == reg)
325.  	    break;
326.      if (i == n_regions)
327.  	return;
328.  
329.      /* Update screen if necessary */
330.      if (reg->visible)
331.  	for (x = reg->bounding_box.lx; x <= reg->bounding_box.hx; x++)
332.  	    for (y = reg->bounding_box.ly; y <= reg->bounding_box.hy; y++)
333.  		if (inside_region(reg, x, y) && cansee(x, y))
334.  		    newsym(x, y);
335.  
336.      free_region(reg);
337.      regions[i] = regions[n_regions - 1];
338.      regions[n_regions - 1] = (NhRegion *) 0;
339.      n_regions--;
340.  }
341.  
342.  /*
343.   * Remove all regions and clear all related data (This must be down
344.   * when changing level, for instance).
345.   */
346.  void
347.  clear_regions()
348.  {
349.      register int i;
350.  
351.      for (i = 0; i < n_regions; i++)
352.  	free_region(regions[i]);
353.      n_regions = 0;
354.      if (max_regions > 0)
355.  	free((genericptr_t) regions);
356.      max_regions = 0;
357.      regions = NULL;
358.  }
359.  
360.  /*
361.   * This function is called every turn.
362.   * It makes the regions age, if necessary and calls the appropriate
363.   * callbacks when needed.
364.   */
365.  void
366.  run_regions()
367.  {
368.      register int i, j, k;
369.      int f_indx;
370.  
371.      /* End of life ? */
372.      /* Do it backward because the array will be modified */
373.      for (i = n_regions - 1; i >= 0; i--) {
374.  	if (regions[i]->ttl == 0) {
375.  	    if ((f_indx = regions[i]->expire_f) == NO_CALLBACK ||
376.  		(*callbacks[f_indx])(regions[i], (genericptr_t) 0))
377.  		remove_region(regions[i]);
378.  	}
379.      }
380.  
381.      /* Process remaining regions */
382.      for (i = 0; i < n_regions; i++) {
383.  	/* Make the region age */
384.  	if (regions[i]->ttl > 0)
385.  	    regions[i]->ttl--;
386.  	/* Check if player is inside region */
387.  	f_indx = regions[i]->inside_f;
388.  	if (f_indx != NO_CALLBACK && regions[i]->player_inside)
389.  	    (void) (*callbacks[f_indx])(regions[i], (genericptr_t) 0);
390.  	/* Check if any monster is inside region */
391.  	if (f_indx != NO_CALLBACK) {
392.  	    for (j = 0; j < regions[i]->n_monst; j++) {
393.  		struct monst *mtmp = find_mid(regions[i]->monsters[j]);
394.  
395.  		if (mtmp && (*callbacks[f_indx])(regions[i], mtmp)) {
396.  		    /* The monster died, remove it from list */
397.  		    regions[i]->monsters[j] = 0;
398.  		}
399.  	    }
400.  	    /* clean up monster list */
401.  	    for (j = 0, k = 0; j < regions[i]->n_monst; j++)
402.  		if (regions[i]->monsters[j] == 0) {
403.  		    k++;
404.  		    if (j != regions[i]->n_monst) {
405.  			regions[i]->monsters[j] = regions[i]->monsters[j + 1];
406.  			regions[i]->monsters[j + 1] = 0;
407.  		    }
408.  		}
409.  	    regions[i]->n_monst -= k;
410.  	}
411.      }
412.  }
413.  
414.  /*
415.   * check whether player enters/leaves one or more regions.
416.   */
417.  boolean
418.  in_out_region(x, y)
419.  xchar
420.      x, y;
421.  {
422.      int i, f_indx;
423.  
424.      /* First check if we can do the move */
425.      for (i = 0; i < n_regions; i++) {
426.  	if (inside_region(regions[i], x, y)
427.  	    && !regions[i]->player_inside && !regions[i]->attach_2_u) {
428.  	    if ((f_indx = regions[i]->can_enter_f) != NO_CALLBACK)
429.  		if (!(*callbacks[f_indx])(regions[i], (genericptr_t) 0))
430.  		    return FALSE;
431.  	} else
432.  	    if (regions[i]->player_inside
433.  		&& !inside_region(regions[i], x, y)
434.  		&& !regions[i]->attach_2_u) {
435.  	    if ((f_indx = regions[i]->can_leave_f) != NO_CALLBACK)
436.  		if (!(*callbacks[f_indx])(regions[i], (genericptr_t) 0))
437.  		    return FALSE;
438.  	}
439.      }
440.  
441.      /* Callbacks for the regions we do leave */
442.      for (i = 0; i < n_regions; i++)
443.  	if (regions[i]->player_inside &&
444.  		!regions[i]->attach_2_u && !inside_region(regions[i], x, y)) {
445.  	    regions[i]->player_inside = FALSE;
446.  	    if (regions[i]->leave_msg != NULL)
447.  		pline(regions[i]->leave_msg);
448.  	    if ((f_indx = regions[i]->leave_f) != NO_CALLBACK)
449.  		(void) (*callbacks[f_indx])(regions[i], (genericptr_t) 0);
450.  	}
451.  
452.      /* Callbacks for the regions we do enter */
453.      for (i = 0; i < n_regions; i++)
454.  	if (!regions[i]->player_inside &&
455.  		!regions[i]->attach_2_u && inside_region(regions[i], x, y)) {
456.  	    regions[i]->player_inside = TRUE;
457.  	    if (regions[i]->enter_msg != NULL)
458.  		pline(regions[i]->enter_msg);
459.  	    if ((f_indx = regions[i]->enter_f) != NO_CALLBACK)
460.  		(void) (*callbacks[f_indx])(regions[i], (genericptr_t) 0);
461.  	}
462.      return TRUE;
463.  }
464.  
465.  /*
466.   * check wether a monster enters/leaves one or more region.
467.  */
468.  boolean
469.  m_in_out_region(mon, x, y)
470.  struct monst *mon;
471.  xchar x, y;
472.  {
473.      int i, f_indx;
474.  
475.      /* First check if we can do the move */
476.      for (i = 0; i < n_regions; i++) {
477.  	if (inside_region(regions[i], x, y) &&
478.  		!mon_in_region(regions[i], mon) &&
479.  		regions[i]->attach_2_m != mon->m_id) {
480.  	    if ((f_indx = regions[i]->can_enter_f) != NO_CALLBACK)
481.  		if (!(*callbacks[f_indx])(regions[i], mon))
482.  		    return FALSE;
483.  	} else if (mon_in_region(regions[i], mon) &&
484.  		!inside_region(regions[i], x, y) &&
485.  		regions[i]->attach_2_m != mon->m_id) {
486.  	    if ((f_indx = regions[i]->can_leave_f) != NO_CALLBACK)
487.  		if (!(*callbacks[f_indx])(regions[i], mon))
488.  		    return FALSE;
489.  	}
490.      }
491.  
492.      /* Callbacks for the regions we do leave */
493.      for (i = 0; i < n_regions; i++)
494.  	if (mon_in_region(regions[i], mon) &&
495.  		regions[i]->attach_2_m != mon->m_id &&
496.  		!inside_region(regions[i], x, y)) {
497.  	    remove_mon_from_reg(regions[i], mon);
498.  	    if ((f_indx = regions[i]->leave_f) != NO_CALLBACK)
499.  		(void) (*callbacks[f_indx])(regions[i], mon);
500.  	}
501.  
502.      /* Callbacks for the regions we do enter */
503.      for (i = 0; i < n_regions; i++)
504.  	if (!regions[i]->player_inside &&
505.  		!regions[i]->attach_2_u && inside_region(regions[i], x, y)) {
506.  	    add_mon_to_reg(regions[i], mon);
507.  	    if ((f_indx = regions[i]->enter_f) != NO_CALLBACK)
508.  		(void) (*callbacks[f_indx])(regions[i], mon);
509.  	}
510.      return TRUE;
511.  }
512.  
513.  /*
514.   * Checks player's regions after a teleport for instance.
515.   */
516.  void
517.  update_player_regions()
518.  {
519.      register int i;
520.  
521.      for (i = 0; i < n_regions; i++)
522.  	if (!regions[i]->attach_2_u)
523.  	    regions[i]->player_inside = inside_region(regions[i], u.ux, u.uy);
524.  	else
525.  	    regions[i]->player_inside = FALSE;
526.  }
527.  
528.  /*
529.   * Ditto for a specified monster.
530.   */
531.  void
532.  update_monster_region(mon)
533.  struct monst *mon;
534.  {
535.      register int i;
536.  
537.      for (i = 0; i < n_regions; i++) {
538.  	if (inside_region(regions[i], mon->mx, mon->my)) {
539.  	    if (!mon_in_region(regions[i], mon))
540.  		add_mon_to_reg(regions[i], mon);
541.  	} else {
542.  	    if (mon_in_region(regions[i], mon))
543.  		remove_mon_from_reg(regions[i], mon);
544.  	}
545.      }
546.  }
547.  
548.  #if 0
549.  /* not yet used */
550.  
551.  /*
552.   * Change monster pointer in regions
553.   * This happens, for instance, when a monster grows and
554.   * need a new structure (internally that is).
555.   */
556.  void
557.  replace_mon_regions(monold, monnew)
558.  struct monst *monold, *monnew;
559.  {
560.      register int i;
561.  
562.      for (i = 0; i < n_regions; i++)
563.  	if (mon_in_region(regions[i], monold)) {
564.  	    remove_mon_from_reg(regions[i], monold);
565.  	    add_mon_to_reg(regions[i], monnew);
566.  	}
567.  }
568.  
569.  /*
570.   * Remove monster from all regions it was in (ie monster just died)
571.   */
572.  void
573.  remove_mon_from_regions(mon)
574.  struct monst *mon;
575.  {
576.      register int i;
577.  
578.      for (i = 0; i < n_regions; i++)
579.  	if (mon_in_region(regions[i], mon))
580.  	    remove_mon_from_reg(regions[i], mon);
581.  }
582.  
583.  #endif	/*0*/
584.  
585.  /*
586.   * Check if a spot is under a visible region (eg: gas cloud).
587.   * Returns NULL if not, otherwise returns region.
588.   */
589.  NhRegion *
590.  visible_region_at(x, y)
591.  xchar x, y;
592.  {
593.      register int i;
594.  
595.      for (i = 0; i < n_regions; i++)
596.  	if (inside_region(regions[i], x, y) && regions[i]->visible &&
597.  		regions[i]->ttl != 0)
598.  	    return regions[i];
599.      return (NhRegion *) 0;
600.  }
601.  
602.  void
603.  show_region(reg, x, y)
604.  NhRegion *reg;
605.  xchar x, y;
606.  {
607.      show_glyph(x, y, reg->glyph);
608.  }
609.  
610.  /**
611.   * save_regions :
612.   */
613.  void
614.  save_regions(fd, mode)
615.  int fd;
616.  int mode;
617.  {
618.      int i, j;
619.      unsigned n;
620.  
621.      bwrite(fd, (genericptr_t) &moves, sizeof (moves));	/* timestamp */
622.      bwrite(fd, (genericptr_t) &n_regions, sizeof (n_regions));
623.      for (i = 0; i < n_regions; i++) {
624.  	bwrite(fd, (genericptr_t) &regions[i]->bounding_box, sizeof (NhRect));
625.  	bwrite(fd, (genericptr_t) &regions[i]->nrects, sizeof (short));
626.  	for (j = 0; j < regions[i]->nrects; j++)
627.  	    bwrite(fd, (genericptr_t) &regions[i]->rects[j], sizeof (NhRect));
628.  	bwrite(fd, (genericptr_t) &regions[i]->attach_2_u, sizeof (boolean));
629.  	n = 0;
630.  	bwrite(fd, (genericptr_t) &regions[i]->attach_2_m, sizeof (unsigned));
631.  	n = regions[i]->enter_msg != NULL ? strlen(regions[i]->enter_msg) : 0;
632.  	bwrite(fd, (genericptr_t) &n, sizeof n);
633.  	if (n > 0)
634.  	    bwrite(fd, (genericptr_t) regions[i]->enter_msg, n);
635.  	n = regions[i]->leave_msg != NULL ? strlen(regions[i]->leave_msg) : 0;
636.  	bwrite(fd, (genericptr_t) &n, sizeof n);
637.  	if (n > 0)
638.  	    bwrite(fd, (genericptr_t) regions[i]->leave_msg, n);
639.  	bwrite(fd, (genericptr_t) &regions[i]->ttl, sizeof (short));
640.  	bwrite(fd, (genericptr_t) &regions[i]->expire_f, sizeof (short));
641.  	bwrite(fd, (genericptr_t) &regions[i]->can_enter_f, sizeof (short));
642.  	bwrite(fd, (genericptr_t) &regions[i]->enter_f, sizeof (short));
643.  	bwrite(fd, (genericptr_t) &regions[i]->can_leave_f, sizeof (short));
644.  	bwrite(fd, (genericptr_t) &regions[i]->leave_f, sizeof (short));
645.  	bwrite(fd, (genericptr_t) &regions[i]->inside_f, sizeof (short));
646.  	bwrite(fd, (genericptr_t) &regions[i]->player_inside, sizeof (boolean));
647.  	bwrite(fd, (genericptr_t) &regions[i]->n_monst, sizeof (short));
648.  	for (j = 0; j < regions[i]->n_monst; j++)
649.  	    bwrite(fd, (genericptr_t) &regions[i]->monsters[j],
650.  	     sizeof (unsigned));
651.  	bwrite(fd, (genericptr_t) &regions[i]->visible, sizeof (boolean));
652.  	bwrite(fd, (genericptr_t) &regions[i]->glyph, sizeof (int));
653.  	bwrite(fd, (genericptr_t) &regions[i]->arg, sizeof (genericptr_t));
654.      }
655.  }
656.  
657.  void
658.  rest_regions(fd)
659.  int fd;
660.  {
661.      int i, j;
662.      unsigned n;
663.      long tmstamp;
664.      char *msg_buf;
665.  
666.      clear_regions();		/* Just for security */
667.      mread(fd, (genericptr_t) &tmstamp, sizeof (tmstamp));
668.      tmstamp = (moves - tmstamp);
669.      mread(fd, (genericptr_t) &n_regions, sizeof (n_regions));
670.      max_regions = n_regions;
671.      if (n_regions > 0)
672.  	regions = (NhRegion **) alloc(sizeof (NhRegion *) * n_regions);
673.      for (i = 0; i < n_regions; i++) {
674.  	regions[i] = (NhRegion *) alloc(sizeof (NhRegion));
675.  	mread(fd, (genericptr_t) &regions[i]->bounding_box, sizeof (NhRect));
676.  	mread(fd, (genericptr_t) &regions[i]->nrects, sizeof (short));
677.  
678.  	if (regions[i]->nrects > 0)
679.  	    regions[i]->rects = (NhRect *)
680.  				  alloc(sizeof (NhRect) * regions[i]->nrects);
681.  	for (j = 0; j < regions[i]->nrects; j++)
682.  	    mread(fd, (genericptr_t) &regions[i]->rects[j], sizeof (NhRect));
683.  	mread(fd, (genericptr_t) &regions[i]->attach_2_u, sizeof (boolean));
684.  	mread(fd, (genericptr_t) &regions[i]->attach_2_m, sizeof (unsigned));
685.  
686.  	mread(fd, (genericptr_t) &n, sizeof n);
687.  	if (n > 0) {
688.  	    msg_buf = (char *) alloc(n + 1);
689.  	    mread(fd, (genericptr_t) msg_buf, n);
690.  	    msg_buf[n] = '\0';
691.  	    regions[i]->enter_msg = (const char *) msg_buf;
692.  	} else
693.  	    regions[i]->enter_msg = NULL;
694.  
695.  	mread(fd, (genericptr_t) &n, sizeof n);
696.  	if (n > 0) {
697.  	    msg_buf = (char *) alloc(n + 1);
698.  	    mread(fd, (genericptr_t) msg_buf, n);
699.  	    msg_buf[n] = '\0';
700.  	    regions[i]->leave_msg = (const char *) msg_buf;
701.  	} else
702.  	    regions[i]->leave_msg = NULL;
703.  
704.  	mread(fd, (genericptr_t) &regions[i]->ttl, sizeof (short));
705.  	/* check for expired region */
706.  	if (regions[i]->ttl >= 0)
707.  	    regions[i]->ttl =
708.  		(regions[i]->ttl > tmstamp) ? regions[i]->ttl - tmstamp : 0;
709.  	mread(fd, (genericptr_t) &regions[i]->expire_f, sizeof (short));
710.  	mread(fd, (genericptr_t) &regions[i]->can_enter_f, sizeof (short));
711.  	mread(fd, (genericptr_t) &regions[i]->enter_f, sizeof (short));
712.  	mread(fd, (genericptr_t) &regions[i]->can_leave_f, sizeof (short));
713.  	mread(fd, (genericptr_t) &regions[i]->leave_f, sizeof (short));
714.  	mread(fd, (genericptr_t) &regions[i]->inside_f, sizeof (short));
715.  	mread(fd, (genericptr_t) &regions[i]->player_inside, sizeof (boolean));
716.  	mread(fd, (genericptr_t) &regions[i]->n_monst, sizeof (short));
717.  	if (regions[i]->n_monst > 0)
718.  	    regions[i]->monsters =
719.  		(unsigned *) alloc(sizeof (unsigned) * regions[i]->n_monst);
720.  	else
721.  	    regions[i]->monsters = NULL;
722.  	regions[i]->max_monst = regions[i]->n_monst;
723.  	for (j = 0; j < regions[i]->n_monst; j++)
724.  	    mread(fd, (genericptr_t) &regions[i]->monsters[j],
725.  		  sizeof (unsigned));
726.  	mread(fd, (genericptr_t) &regions[i]->visible, sizeof (boolean));
727.  	mread(fd, (genericptr_t) &regions[i]->glyph, sizeof (int));
728.  	mread(fd, (genericptr_t) &regions[i]->arg, sizeof (genericptr_t));
729.      }
730.      /* remove expired regions, do not trigger the expire_f callback (yet!) */
731.      for (i = n_regions - 1; i >= 0; i--)
732.  	if (regions[i]->ttl == 0)
733.  	    remove_region(regions[i]);
734.  }
735.  
736.  #if 0
737.  /* not yet used */
738.  
739.  /*--------------------------------------------------------------*
740.   *								*
741.   *			Create Region with just a message	*
742.   *								*
743.   *--------------------------------------------------------------*/
744.  
745.  NhRegion *
746.  create_msg_region(x, y, w, h, msg_enter, msg_leave)
747.  xchar x, y;
748.  xchar w, h;
749.  const char *msg_enter;
750.  const char *msg_leave;
751.  {
752.      NhRect tmprect;
753.      NhRegion *reg = create_region((NhRect *) 0, 0);
754.  
755.      reg->enter_msg = msg_enter;
756.      reg->leave_msg = msg_leave;
757.      tmprect.lx = x;
758.      tmprect.ly = y;
759.      tmprect.hx = x + w;
760.      tmprect.hy = y + h;
761.      add_rect_to_reg(reg, &tmprect);
762.      reg->ttl = -1;
763.      return reg;
764.  }
765.  
766.  
767.  /*--------------------------------------------------------------*
768.   *								*
769.   *			Force Field Related Code		*
770.   *			(unused yet)				*
771.   *--------------------------------------------------------------*/
772.  
773.  boolean
774.  enter_force_field(p1, p2)
775.  genericptr_t p1;
776.  genericptr_t p2;
777.  {
778.      struct monst *mtmp;
779.  
780.      if (p2 == NULL) {		/* That means the player */
781.  	if (!Blind)
782.  		You("bump into %s. Ouch!",
783.  		    Hallucination ? "an invisible tree" :
784.  			"some kind of invisible wall");
785.  	else
786.  	    pline("Ouch!");
787.      } else {
788.  	mtmp = (struct monst *) p2;
789.  	if (canseemon(mtmp))
790.  	    pline("%s bumps into something!", Monnam(mtmp));
791.      }
792.      return FALSE;
793.  }
794.  
795.  NhRegion *
796.  create_force_field(x, y, radius, ttl)
797.  xchar x, y;
798.  int radius, ttl;
799.  {
800.      int i;
801.      NhRegion *ff;
802.      int nrect;
803.      NhRect tmprect;
804.  
805.      ff = create_region((NhRect *) 0, 0);
806.      nrect = radius;
807.      tmprect.lx = x;
808.      tmprect.hx = x;
809.      tmprect.ly = y - (radius - 1);
810.      tmprect.hy = y + (radius - 1);
811.      for (i = 0; i < nrect; i++) {
812.  	add_rect_to_reg(ff, &tmprect);
813.  	tmprect.lx--;
814.  	tmprect.hx++;
815.  	tmprect.ly++;
816.  	tmprect.hy--;
817.      }
818.      ff->ttl = ttl;
819.   /* ff->can_enter_f = enter_force_field; */
820.   /* ff->can_leave_f = enter_force_field; */
821.      add_region(ff);
822.      return ff;
823.  }
824.  
825.  #endif	/*0*/
826.  
827.  /*--------------------------------------------------------------*
828.   *								*
829.   *			Gas cloud related code			*
830.   *								*
831.   *--------------------------------------------------------------*/
832.  
833.  /*
834.   * Here is an example of an expire function that may prolong
835.   * region life after some mods...
836.   */
837.  boolean
838.  expire_gas_cloud(p1, p2)
839.  genericptr_t p1;
840.  genericptr_t p2;
841.  {
842.      NhRegion *reg;
843.      int damage;
844.  
845.      reg = (NhRegion *) p1;
846.      damage = (int) reg->arg;
847.  
848.      /* If it was a thick cloud, it dissipates a little first */
849.      if (damage >= 5) {
850.  	damage /= 2;		/* It dissipates, let's do less damage */
851.  	reg->arg = (genericptr_t) damage;
852.  	reg->ttl = 2;		/* Here's the trick : reset ttl */
853.  	return FALSE;		/* THEN return FALSE, means "still there" */
854.      }
855.      return TRUE;		/* OK, it's gone, you can free it! */
856.  }
857.  
858.  boolean
859.  inside_gas_cloud(p1, p2)
860.  genericptr_t p1;
861.  genericptr_t p2;
862.  {
863.      NhRegion *reg;
864.      struct monst *mtmp;
865.      int dam;
866.  
867.      reg = (NhRegion *) p1;
868.      dam = (int) reg->arg;
869.      if (p2 == NULL) {		/* This means *YOU* Bozo! */
870.  	if (nonliving(youmonst.data) || Breathless)
871.  	    return FALSE;
872.  	if (!Blind)
873.  	    make_blinded(1L, FALSE);
874.  	if (!Poison_resistance) {
875.  	    pline("Something is burning your lungs!");
876.  	    You("cough and spit blood!");
877.  	    losehp(rnd(dam) + 5, "gas cloud", KILLED_BY_AN);
878.  	    return FALSE;
879.  	} else {
880.  	    You("cough!");
881.  	    return FALSE;
882.  	}
883.      } else {			/* A monster is inside the cloud */
884.  	mtmp = (struct monst *) p2;
885.  
886.  	/* Non living and non breathing monsters are not concerned */
887.  	if (!nonliving(mtmp->data) && !breathless(mtmp->data)) {
888.  	    if (cansee(mtmp->mx, mtmp->my))
889.  		pline("%s coughs!", Monnam(mtmp));
890.  	    if (resists_poison(mtmp))
891.  		return FALSE;
892.  	    mtmp->mhp -= rnd(dam) + 5;
893.  	    if (mtmp->mhp <= 0) {
894.  		int xx = mtmp->mx;
895.  		int yy = mtmp->my;
896.  
897.  		monkilled(mtmp, "gas", AD_PHYS);
898.  		if (mtmp->mhp <= 0) {
899.  		    newsym(xx, yy);
900.  		    return TRUE;	/* The monster died, signal it! */
901.  		}
902.  	    }
903.  	}
904.      }
905.      return FALSE;		/* Monster is still alive */
906.  }
907.  
908.  NhRegion *
909.  create_gas_cloud(x, y, radius, damage)
910.  xchar x, y;
911.  int radius;
912.  int damage;
913.  {
914.      NhRegion *cloud;
915.      int i, nrect;
916.      NhRect tmprect;
917.  
918.      cloud = create_region((NhRect *) 0, 0);
919.      nrect = radius;
920.      tmprect.lx = x;
921.      tmprect.hx = x;
922.      tmprect.ly = y - (radius - 1);
923.      tmprect.hy = y + (radius - 1);
924.      for (i = 0; i < nrect; i++) {
925.  	add_rect_to_reg(cloud, &tmprect);
926.  	tmprect.lx--;
927.  	tmprect.hx++;
928.  	tmprect.ly++;
929.  	tmprect.hy--;
930.      }
931.      cloud->ttl = rn1(3,4);
932.      cloud->inside_f = INSIDE_GAS_CLOUD;
933.      cloud->expire_f = EXPIRE_GAS_CLOUD;
934.      cloud->arg = (genericptr_t) damage;
935.      cloud->visible = TRUE;
936.      cloud->glyph = monnum_to_glyph(PM_FOG_CLOUD);
937.      add_region(cloud);
938.      return cloud;
939.  }
940.  
941.  /*region.c*/