server/server/disease.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 *
 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 2002 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992 Frank Tore Johansen
 *
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

/* This file contains all the code implementing diseases,
 * except for odds and ends in attack.c and in
 * living.c
 */

/*

For DISEASES:
Stat            Property        Definition

attacktype      Attack effects  Attacktype of the disease. usu. AT_GODPOWER.
other_arch      Creation        object created and dropped when symptom moved.
title           Message         When the "disease" "infects" something, it will
                                print "title victim!!!" to the player who owns
                                the "disease".
wc+             Infectiousness  How well the plague spreads person-to-person
magic+          Range           range of infection
Stats*          Disability      What stats are reduced by the disease (str con...)
maxhp+          Persistence     How long the disease can last OUTSIDE the host.
value           TimeLeft        Counter for persistence
dam^            Damage          How much damage it does (%?).
maxgrace+       Duration        How long before the disease is naturally cured.
food            DurCount        Counter for Duration

speed           Speed           How often the disease moves.
last_sp^        Lethargy        Percentage of max speed. 10 = 10% speed.

maxsp^          Mana deplete    Saps mana.
ac^             Progressiveness How the diseases increases in severity.
last_eat*^      Deplete food    saps food if negative
last_heal       GrantImmunity   If nonzero, disease does NOT grant immunity
                                when it runs out

exp             experience      experience awarded when plague cured
hp*^            ReduceRegen     reduces regeneration of disease-bearer
sp*^            ReduceSpRegen   reduces spellpoint regeneration

name            Name            Name of the plague
msg             message         What the plague says when it strikes.
race            those affected  species/race the plague strikes (* = everything)
level           Plague Level    General description of the plague's deadliness
armour          Attenuation     reduction in wc per generation of disease.
                                This builds in a self-limiting factor.

Explanations:
* means this # should be negative to cause adverse effect.
+ means that this effect is modulated in spells by ldur
^ means that this effect is modulated in spells by ldam

attacktype is the attacktype used by the disease to smite "dam" damage with.

wc/127 is the chance of someone in range catching it.

magic is the range at which infection may occur.  If negative, the range is
NOT level dependent.

Stats are stat modifications.  These should typically be negative.

maxhp is how long the disease will persist if the host dies and "drops" it,
      in "disease moves", i.e., moves of the disease.  If negative, permanent.
      

value is the counter for maxhp, it starts at maxhp and drops...

dam     if positive, it is straight damage.  if negative, a %-age.

maxgrace  how long in "disease moves" the disease lasts in the host, if negative,
          permanent until cured.

food    if negative, disease is permanent.  otherwise, decreases at <speed>,
        disease goes away at food=0, set to "maxgrace" on infection.

speed is the speed of the disease, how fast "disease moves" occur.

last_sp is the lethargy imposed on the player by the disease.  A lethargy
       of "1" reduces the players speed to 1% of its normal value.

maxsp how much mana is sapped per "disease move".  if negative, a %-age is
     taken.

ac  every "disease move" the severity of the symptoms are increased by
    ac/100.  (severity = 1 + (accumlated_progression)/100)

last_eat  increases food usage if negative.


For SYMPTOMS:

Stats            modify stats
hp               modify regen
value            progression counter (multiplier = value/100)
food             modify food use (from last_eat in DISEASE)
maxsp            suck mana ( as noted for DISEASE)
last_sp          Lethargy
msg              What to say
speed            speed of movement, from DISEASE


*/


#include <global.h>
#include <object.h>
#include <living.h>
#include <sproto.h>
#include <spells.h>
#include <sounds.h>
#include <skills.h>

/*  IMPLEMENTATION NOTES
         
         Diseases may be contageous.  They are objects which exist in a player's
inventory.  They themselves do nothing, except modify Symptoms, or
spread to other live objects.  Symptoms are what actually damage the player:
these are their own object. */

/*  grants immunity to plagues we've seen before.  */
static int
grant_immunity (object *disease)
{
  object *immunity;
  object *walk;

  /* Don't give immunity to this disease if last_heal is set. */
  if (disease->last_heal)
    return 0;

  /*  first, search for an immunity of the same name */
  for (walk = disease->env->inv; walk; walk = walk->below)
    if (disease->name == walk->name && walk->is_immunity ())
      {
        walk->level = disease->level;
        return 1;             /* just update the existing immunity. */
      }

  immunity = archetype::get (shstr_immunity);

  immunity->name       = disease->name;
  immunity->level      = disease->level;
  immunity->move_block = 0;

  insert_ob_in_ob (immunity, disease->env);

  return 1;
}

/* argument is a disease */
static object *
find_symptom (object *disease)
{
  /* check the inventory for symptoms */
  for (object *walk = disease->env->inv; walk; walk = walk->below)
    if (walk->name == disease->name && walk->type == SYMPTOM)
      return walk;

  return NULL;
}

/* remove any symptoms of disease
 * Modified by MSW 2003-03-28 do try to find all the symptom the
 * player may have - I think through some odd interactoins with
 * disease level and player level and whatnot, a player could get
 * more than one symtpom to a disease.
 */
static int
remove_symptoms (object *disease)
{
  object *symptom, *victim = NULL;

  while ((symptom = find_symptom (disease)) != NULL)
    {
      if (!victim)
        victim = symptom->env;

      symptom->destroy ();
    }

  if (victim)
    victim->update_stats ();

  return 0;
}

/*  searches around for more victims to infect */
static int
check_infection (object *disease)
{
  int range = abs (disease->magic);

  object *op = disease->outer_env_or_self ();

  if (!op->is_on_map ())
    return 0;

  dynbuf buf;
  unordered_mapwalk (buf, op, -range, -range, range, range)
    {
      mapspace &ms = m->at (nx, ny);

      if (ms.flags () & P_IS_ALIVE)
        for (object *tmp = ms.bot; tmp; tmp = tmp->above)
          infect_object (tmp, disease, 0);
    }

  return 1;
}

/* check if victim is susceptible to disease. */
static int
is_susceptible_to_disease (object *victim, object *disease)
{
  if (!victim->flag [FLAG_ALIVE])
    return 0;

  if (victim->flag [FLAG_WIZ])
    return 0;

  if (disease->race.contains ("*") && !victim->flag [FLAG_UNDEAD])
    return 1;

  if ((disease->race == shstr_undead) && victim->flag [FLAG_UNDEAD])
    return 1;

  if ((victim->race && disease->race.contains (victim->race)) || disease->race.contains (victim->name))
    return 1;

  return 0;
}

/*  this function monitors the symptoms caused by the disease (if any),
causes symptoms, and modifies existing symptoms in the case of
existing diseases.  */
static int
do_symptoms (object *disease)
{
  object *symptom;
  object *victim;
  object *tmp;

  victim = disease->env;

  if (!victim)
    return 0;                   /* no-one to inflict symptoms on */

  /* This is a quick hack - for whatever reason, disease->env will point
   * back to disease, causing endless loops.  Why this happens really needs
   * to be found, but this should at least prevent the infinite loops.
   */
  //TODO: should no longer be the case, monitor, and remove
  if (victim == disease)
    {
      LOG (llevError | logBacktrace, "%s: disease->env points to itself", disease->debug_desc ());
      return 0;
    }

  symptom = find_symptom (disease);
  if (!symptom)
    {
      /* no symptom?  need to generate one! */

      /* first check and see if the carrier of the disease is immune.  If so, no symptoms!  */
      if (!is_susceptible_to_disease (victim, disease))
        return 0;

      /* check for an actual immunity */
      /* do an immunity check */
      for (tmp = victim->head_ ()->inv; tmp; tmp = tmp->below)
        if (tmp->name == disease->name && tmp->is_immunity ())        /* possibly an immunity, or diseased */
          if (tmp->level >= disease->level)
            return 0;         /* Immune! */

      object *new_symptom = archetype::get (shstr_symptom);

      /* Something special done with dam.  We want diseases to be more
       * random in what they'll kill, so we'll make the damage they
       * do random, note, this has a weird effect with progressive diseases.
       */
      if (disease->stats.dam)
        {
          int dam = disease->stats.dam;

          /* reduce the damage, on average, 50%, and making things random. */

          dam = random_roll (1, abs (dam), victim, PREFER_LOW);
          if (disease->stats.dam < 0)
            dam = -dam;

          new_symptom->stats.dam = dam;
        }

      new_symptom->stats.maxsp = disease->stats.maxsp;
      new_symptom->stats.food  = new_symptom->stats.maxgrace;

      new_symptom->name = new_symptom->name_pl = disease->name;

      new_symptom->level = disease->level;
      new_symptom->value = 0;

      new_symptom->set_speed (disease->speed);

      for (int i = 0; i < NUM_STATS; ++i)
        new_symptom->stats.stat (i) = disease->stats.stat (i);

      new_symptom->stats.sp    = disease->stats.sp;
      new_symptom->stats.food  = disease->last_eat;
      new_symptom->stats.maxsp = disease->stats.maxsp;
      new_symptom->last_sp     = disease->last_sp;
      new_symptom->stats.exp   = 0;
      new_symptom->stats.hp    = disease->stats.hp;
      new_symptom->msg         = disease->msg;
      new_symptom->attacktype  = disease->attacktype;
      new_symptom->other_arch  = disease->other_arch;
      new_symptom->skill       = disease->skill;

      new_symptom->move_block = 0;

      victim->head_ ()->insert (new_symptom);

      // set owner last, as insert clears owner
      new_symptom->set_owner (disease->owner);

      return 1;
    }

  /* now deal with progressing diseases: we increase the debility
   * caused by the symptoms.
   */
  if (disease->stats.ac)
    {
      symptom->value = clamp (symptom->value + disease->stats.ac, 0, 100*100);

      float scale = 1.f + symptom->value / 100.f;

      /* now rescale all the debilities */
      for (int i = 0; i < NUM_STATS; ++i)
        symptom->stats.stat (i) = clamp (int (scale * disease->stats.stat (i)), -128, 127);

      symptom->stats.dam   = clamp (scale * disease->stats.dam  , -1024, 1024);
      symptom->stats.food  = clamp (scale * disease->last_eat   , -1024, 1024);
      symptom->stats.maxsp = clamp (scale * disease->stats.maxsp, -1024, 1024);
      symptom->stats.sp    = clamp (scale * disease->stats.sp   , -1024, 1024);
      symptom->stats.hp    = clamp (scale * disease->stats.hp   , -1024, 1024);
      symptom->stats.exp   = 0;
      symptom->last_sp     = disease->last_sp ? clamp (disease->last_sp / scale, 1, 1024) : 0;
      symptom->msg         = disease->msg;
      symptom->attacktype  = disease->attacktype;
      symptom->other_arch  = disease->other_arch;
    }

  symptom->set_flag (FLAG_APPLIED);
  victim->update_stats ();

  return 1;
}

int
move_disease (object *disease)
{
  /* First task is to determine if the disease is inside or outside of someone.
   * If outside, we decrement 'value' until we're gone.
   */

  if (!disease->env)
    {                           /* we're outside of someone */
      if (disease->stats.maxhp > 0)
        disease->value--;

      if (!disease->value)
        {
          disease->destroy ();
          return 1;
        }
    }
  else
    {
      /* if we're inside a person, have the disease run its course */
      /* negative/zero food denotes "perpetual" diseases. */
      if (disease->stats.food > 0)
        {
          disease->stats.food--;

          if (!disease->stats.food)
            {
              remove_symptoms (disease);        /* remove the symptoms of this disease */
              grant_immunity (disease);
              disease->destroy ();
              return 1;
            }
        }
    }

  /*  check to see if we infect others */
  check_infection (disease);

  /* impose or modify the symptoms of the disease */
  if (disease->env && is_susceptible_to_disease (disease->env, disease))
    do_symptoms (disease);

  return 0;
}

/*  check to see if an object is infectable:
 *       objects with immunity aren't infectable.
 *       objects already infected aren't infectable.
 *       dead objects aren't infectable.
 *       undead objects are infectible only if specifically named.
*/
int
infect_object (object *victim, object *disease, int force)
{
  object *tmp;
  object *new_disease;

  /* don't infect inanimate objects */
  if (!victim->flag [FLAG_MONSTER] && !(victim->type == PLAYER))
    return 0;

  /* check and see if victim can catch disease:  diseases
   *  are specific
   */
  if (!is_susceptible_to_disease (victim, disease))
    return 0;

  /* roll the dice on infection before doing the inventory check!  */
  if (!force && (random_roll (0, 126, victim, PREFER_HIGH) >= disease->stats.wc))
    return 0;

  /* do an immunity check */

  /* There used to (IMO) be a flaw in the below - it used to be the case
   * that if level check was done for both immunity and disease. This could
   * result in a person with multiple afflictions of the same disease
   * (eg, level 1 cold, level 2 cold, level 3 cold, etc), as long as
   * they were cast in that same order.  Instead, change it so that
   * if you diseased, you can't get diseased more.
   */

  for (tmp = victim->head_ ()->inv; tmp; tmp = tmp->below)
    if (tmp->name == disease->name && tmp->is_immunity () && tmp->level >= disease->level)
      return 0;               /* Immune! */
    else if (tmp->type == DISEASE && tmp->name == disease->name)
      return 0;               /* already diseased */

  /*  If we've gotten this far, go ahead and infect the victim.  */

  new_disease = disease->clone ();

  new_disease->stats.food = disease->stats.maxgrace;
  new_disease->value      = disease->stats.maxhp;
  new_disease->stats.wc  -= disease->last_grace; /* self-limiting factor */

  /* This appears to be a horrible case of overloading 'NO_PASS'
   * for meaning in the diseases.
   */
  new_disease->move_block = 0;

  // insert before setting the owner
  victim->head_ ()->insert (new_disease);

  if (disease->owner)
    new_disease->set_owner (disease->owner);
  else if (object *pl = disease->in_player ())
    /* for diseases which are passed by hitting, set owner and skill */
    new_disease->set_owner (pl);

  if (INVOKE_OBJECT (INFECT, victim, ARG_OBJECT (disease), ARG_OBJECT (new_disease)))
    return 1;

  if (new_disease->owner && new_disease->owner->type == PLAYER)
    {
      const char *buf;

      /* if the disease has a title, it has a special infection message
       * This messages is printed in the form MESSAGE victim
       */
      if (new_disease->title)
        buf = format ("%s %s!!", &disease->title, &victim->name);
      else
        buf = format ("You infect %s with your disease, %s!", &victim->name, &new_disease->name);

      if (victim->type == PLAYER)
        new_draw_info (NDI_UNIQUE | NDI_RED, 0, new_disease->owner, buf);
      else
        new_draw_info (0, 4, new_disease->owner, buf);
    }

  if (victim->type == PLAYER)
    new_draw_info (NDI_UNIQUE | NDI_RED, 0, victim, "You suddenly feel ill.");

  return 1;
}

/*  make the symptom do the nasty things it does  */
int
move_symptom (object *symptom)
{
  object *victim = symptom->env;

  if (!victim || !victim->map)
    {                           /* outside a monster/player, die immediately */
      symptom->destroy ();
      return 0;
    }

  /* create the symptom "other arch" object and drop it here
   * under every part of the monster
   * The victim may well have died.
   */
  if (victim->map)
    {
      victim->play_sound (symptom->sound);

      if (symptom->other_arch)
        for (object *tmp = victim->head_ (); tmp; tmp = tmp->more)
          {
            object *new_ob = symptom->other_arch->instance ();
            new_ob->x = tmp->x;
            new_ob->y = tmp->y;
            new_ob->map = victim->map;
            insert_ob_in_map (new_ob, victim->map, victim, 0);
          }
    }

  int damage =
     symptom->stats.dam > 0
       ? symptom->stats.dam
       : max (1, victim->stats.maxhp * -symptom->stats.dam / 100);

  hit_player (victim, damage, symptom, symptom->attacktype, 1);

  int sp_reduce =
     symptom->stats.maxsp > 0
       ? symptom->stats.maxsp
       : max (1, victim->stats.maxsp * -symptom->stats.maxsp / 100);

  victim->stats.sp = max (0, victim->stats.sp - sp_reduce);

  new_draw_info (NDI_UNIQUE | NDI_RED, 0, victim, symptom->msg);

  return 1;
}

/* possibly infect due to direct physical contact
 * i.e., AT_PHYSICAL-- called from "hit_player_attacktype" */
int
check_physically_infect (object *victim, object *hitter)
{
  /* search for diseases, give every disease a chance to infect */
  for (object *disease = hitter->inv; disease; disease = disease->below)
    if (disease->type == DISEASE)
      infect_object (victim, disease, 0);

  return 1;
}

/* do the cure disease stuff, from the spell "cure disease" */
int
cure_disease (object *sufferer, object *caster, object *spell)
{
  object *disease, *next;
  int cure = 0;

  int casting_level = caster ? caster->level : 1000;       /* if null caster, CURE all.  */

  for (disease = sufferer->inv; disease; disease = next)
    {
      next = disease->below;

      if (disease->type == DISEASE)
        {                       /* attempt to cure this disease */
          /* If caster level is higher than disease level, cure chance
           * is automatic.  If lower, then the chance is basically
           * 1 in level_diff - if there is a 5 level difference, chance
           * is 1 in 5.
           */
          if ((casting_level >= disease->level) || (!(random_roll (0, (disease->level - casting_level - 1), caster, PREFER_LOW))))
            {
              remove_symptoms (disease);
              cure = 1;

              if (caster && spell)
                change_exp (caster, disease->stats.exp, spell->skill, SK_EXP_SKILL_ONLY);

              disease->destroy ();
            }
        }
    }

  if (cure)
    {
      /* Only draw these messages once */
      if (caster)
        new_draw_info_format (NDI_UNIQUE, 0, caster, "You cure a disease!");

      new_draw_info (NDI_UNIQUE, 0, sufferer, "You no longer feel diseased.");
    }

  return 1;
}

#if 0 // unused, but seems interesting
/* reduces disease progression:  reduce_symptoms
 * return true if we actually reduce a disease.
 */
static int
reduce_symptoms (object *sufferer, int reduction)
{
  object *walk;
  int success = 0;

  for (walk = sufferer->inv; walk; walk = walk->below)
    {
      if (walk->type == SYMPTOM)
        {
          if (walk->value > 0)
            {
              success = 1;
              walk->value = max (0, walk->value - 2 * reduction);
              /* give the disease time to modify this symptom,
               * and reduce its severity.  */
              walk->speed_left = 0;
            }
        }
    }

  if (success)
    new_draw_info (NDI_UNIQUE, 0, sufferer, "Your illness seems less severe.");

  return success;
}
#endif
Revision:	1.73
Committed:	Sun Jan 29 02:47:05 2017 UTC (7 years, 3 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.72:	+8 -8 lines
Log Message:	remove eol whitespace
#	Content
1	/*
2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*
4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	* Copyright (©) 2002 Mark Wedel & Crossfire Development Team
6	* Copyright (©) 1992 Frank Tore Johansen
7	*
8	* Deliantra is free software: you can redistribute it and/or modify it under
9	* the terms of the Affero GNU General Public License as published by the
10	* Free Software Foundation, either version 3 of the License, or (at your
11	* option) any later version.
12	*
13	* This program is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	* GNU General Public License for more details.
17	*
18	* You should have received a copy of the Affero GNU General Public License
19	* and the GNU General Public License along with this program. If not, see
20	* <http://www.gnu.org/licenses/>.
21	*
22	* The authors can be reached via e-mail to <support@deliantra.net>
23	*/
24
25	/* This file contains all the code implementing diseases,
26	* except for odds and ends in attack.c and in
27	* living.c
28	*/
29
30	/*
31
32	For DISEASES:
33	Stat Property Definition
34
35	attacktype Attack effects Attacktype of the disease. usu. AT_GODPOWER.
36	other_arch Creation object created and dropped when symptom moved.
37	title Message When the "disease" "infects" something, it will
38	print "title victim!!!" to the player who owns
39	the "disease".
40	wc+ Infectiousness How well the plague spreads person-to-person
41	magic+ Range range of infection
42	Stats* Disability What stats are reduced by the disease (str con...)
43	maxhp+ Persistence How long the disease can last OUTSIDE the host.
44	value TimeLeft Counter for persistence
45	dam^ Damage How much damage it does (%?).
46	maxgrace+ Duration How long before the disease is naturally cured.
47	food DurCount Counter for Duration
48
49	speed Speed How often the disease moves.
50	last_sp^ Lethargy Percentage of max speed. 10 = 10% speed.
51
52	maxsp^ Mana deplete Saps mana.
53	ac^ Progressiveness How the diseases increases in severity.
54	last_eat*^ Deplete food saps food if negative
55	last_heal GrantImmunity If nonzero, disease does NOT grant immunity
56	when it runs out
57
58	exp experience experience awarded when plague cured
59	hp*^ ReduceRegen reduces regeneration of disease-bearer
60	sp*^ ReduceSpRegen reduces spellpoint regeneration
61
62	name Name Name of the plague
63	msg message What the plague says when it strikes.
64	race those affected species/race the plague strikes (* = everything)
65	level Plague Level General description of the plague's deadliness
66	armour Attenuation reduction in wc per generation of disease.
67	This builds in a self-limiting factor.
68
69	Explanations:
70	* means this # should be negative to cause adverse effect.
71	+ means that this effect is modulated in spells by ldur
72	^ means that this effect is modulated in spells by ldam
73
74	attacktype is the attacktype used by the disease to smite "dam" damage with.
75
76	wc/127 is the chance of someone in range catching it.
77
78	magic is the range at which infection may occur. If negative, the range is
79	NOT level dependent.
80
81	Stats are stat modifications. These should typically be negative.
82
83	maxhp is how long the disease will persist if the host dies and "drops" it,
84	in "disease moves", i.e., moves of the disease. If negative, permanent.
85
86
87	value is the counter for maxhp, it starts at maxhp and drops...
88
89	dam if positive, it is straight damage. if negative, a %-age.
90
91	maxgrace how long in "disease moves" the disease lasts in the host, if negative,
92	permanent until cured.
93
94	food if negative, disease is permanent. otherwise, decreases at <speed>,
95	disease goes away at food=0, set to "maxgrace" on infection.
96
97	speed is the speed of the disease, how fast "disease moves" occur.
98
99	last_sp is the lethargy imposed on the player by the disease. A lethargy
100	of "1" reduces the players speed to 1% of its normal value.
101
102	maxsp how much mana is sapped per "disease move". if negative, a %-age is
103	taken.
104
105	ac every "disease move" the severity of the symptoms are increased by
106	ac/100. (severity = 1 + (accumlated_progression)/100)
107
108	last_eat increases food usage if negative.
109
110
111
112	For SYMPTOMS:
113
114	Stats modify stats
115	hp modify regen
116	value progression counter (multiplier = value/100)
117	food modify food use (from last_eat in DISEASE)
118	maxsp suck mana ( as noted for DISEASE)
119	last_sp Lethargy
120	msg What to say
121	speed speed of movement, from DISEASE
122
123
124	*/
125
126
127	#include <global.h>
128	#include <object.h>
129	#include <living.h>
130	#include <sproto.h>
131	#include <spells.h>
132	#include <sounds.h>
133	#include <skills.h>
134
135	/* IMPLEMENTATION NOTES
136
137	Diseases may be contageous. They are objects which exist in a player's
138	inventory. They themselves do nothing, except modify Symptoms, or
139	spread to other live objects. Symptoms are what actually damage the player:
140	these are their own object. */
141
142	/* grants immunity to plagues we've seen before. */
143	static int
144	grant_immunity (object *disease)
145	{
146	object *immunity;
147	object *walk;
148
149	/* Don't give immunity to this disease if last_heal is set. */
150	if (disease->last_heal)
151	return 0;
152
153	/* first, search for an immunity of the same name */
154	for (walk = disease->env->inv; walk; walk = walk->below)
155	if (disease->name == walk->name && walk->is_immunity ())
156	{
157	walk->level = disease->level;
158	return 1; /* just update the existing immunity. */
159	}
160
161	immunity = archetype::get (shstr_immunity);
162
163	immunity->name = disease->name;
164	immunity->level = disease->level;
165	immunity->move_block = 0;
166
167	insert_ob_in_ob (immunity, disease->env);
168
169	return 1;
170	}
171
172	/* argument is a disease */
173	static object *
174	find_symptom (object *disease)
175	{
176	/* check the inventory for symptoms */
177	for (object *walk = disease->env->inv; walk; walk = walk->below)
178	if (walk->name == disease->name && walk->type == SYMPTOM)
179	return walk;
180
181	return NULL;
182	}
183
184	/* remove any symptoms of disease
185	* Modified by MSW 2003-03-28 do try to find all the symptom the
186	* player may have - I think through some odd interactoins with
187	* disease level and player level and whatnot, a player could get
188	* more than one symtpom to a disease.
189	*/
190	static int
191	remove_symptoms (object *disease)
192	{
193	object symptom, victim = NULL;
194
195	while ((symptom = find_symptom (disease)) != NULL)
196	{
197	if (!victim)
198	victim = symptom->env;
199
200	symptom->destroy ();
201	}
202
203	if (victim)
204	victim->update_stats ();
205
206	return 0;
207	}
208
209	/* searches around for more victims to infect */
210	static int
211	check_infection (object *disease)
212	{
213	int range = abs (disease->magic);
214
215	object *op = disease->outer_env_or_self ();
216
217	if (!op->is_on_map ())
218	return 0;
219
220	dynbuf buf;
221	unordered_mapwalk (buf, op, -range, -range, range, range)
222	{
223	mapspace &ms = m->at (nx, ny);
224
225	if (ms.flags () & P_IS_ALIVE)
226	for (object *tmp = ms.bot; tmp; tmp = tmp->above)
227	infect_object (tmp, disease, 0);
228	}
229
230	return 1;
231	}
232
233	/* check if victim is susceptible to disease. */
234	static int
235	is_susceptible_to_disease (object victim, object disease)
236	{
237	if (!victim->flag [FLAG_ALIVE])
238	return 0;
239
240	if (victim->flag [FLAG_WIZ])
241	return 0;
242
243	if (disease->race.contains ("*") && !victim->flag [FLAG_UNDEAD])
244	return 1;
245
246	if ((disease->race == shstr_undead) && victim->flag [FLAG_UNDEAD])
247	return 1;
248
249	if ((victim->race && disease->race.contains (victim->race)) \|\| disease->race.contains (victim->name))
250	return 1;
251
252	return 0;
253	}
254
255	/* this function monitors the symptoms caused by the disease (if any),
256	causes symptoms, and modifies existing symptoms in the case of
257	existing diseases. */
258	static int
259	do_symptoms (object *disease)
260	{
261	object *symptom;
262	object *victim;
263	object *tmp;
264
265	victim = disease->env;
266
267	if (!victim)
268	return 0; /* no-one to inflict symptoms on */
269
270	/* This is a quick hack - for whatever reason, disease->env will point
271	* back to disease, causing endless loops. Why this happens really needs
272	* to be found, but this should at least prevent the infinite loops.
273	*/
274	//TODO: should no longer be the case, monitor, and remove
275	if (victim == disease)
276	{
277	LOG (llevError \| logBacktrace, "%s: disease->env points to itself", disease->debug_desc ());
278	return 0;
279	}
280
281	symptom = find_symptom (disease);
282	if (!symptom)
283	{
284	/* no symptom? need to generate one! */
285
286	/* first check and see if the carrier of the disease is immune. If so, no symptoms! */
287	if (!is_susceptible_to_disease (victim, disease))
288	return 0;
289
290	/* check for an actual immunity */
291	/* do an immunity check */
292	for (tmp = victim->head_ ()->inv; tmp; tmp = tmp->below)
293	if (tmp->name == disease->name && tmp->is_immunity ()) /* possibly an immunity, or diseased */
294	if (tmp->level >= disease->level)
295	return 0; /* Immune! */
296
297	object *new_symptom = archetype::get (shstr_symptom);
298
299	/* Something special done with dam. We want diseases to be more
300	* random in what they'll kill, so we'll make the damage they
301	* do random, note, this has a weird effect with progressive diseases.
302	*/
303	if (disease->stats.dam)
304	{
305	int dam = disease->stats.dam;
306
307	/* reduce the damage, on average, 50%, and making things random. */
308
309	dam = random_roll (1, abs (dam), victim, PREFER_LOW);
310	if (disease->stats.dam < 0)
311	dam = -dam;
312
313	new_symptom->stats.dam = dam;
314	}
315
316	new_symptom->stats.maxsp = disease->stats.maxsp;
317	new_symptom->stats.food = new_symptom->stats.maxgrace;
318
319	new_symptom->name = new_symptom->name_pl = disease->name;
320
321	new_symptom->level = disease->level;
322	new_symptom->value = 0;
323
324	new_symptom->set_speed (disease->speed);
325
326	for (int i = 0; i < NUM_STATS; ++i)
327	new_symptom->stats.stat (i) = disease->stats.stat (i);
328
329	new_symptom->stats.sp = disease->stats.sp;
330	new_symptom->stats.food = disease->last_eat;
331	new_symptom->stats.maxsp = disease->stats.maxsp;
332	new_symptom->last_sp = disease->last_sp;
333	new_symptom->stats.exp = 0;
334	new_symptom->stats.hp = disease->stats.hp;
335	new_symptom->msg = disease->msg;
336	new_symptom->attacktype = disease->attacktype;
337	new_symptom->other_arch = disease->other_arch;
338	new_symptom->skill = disease->skill;
339
340	new_symptom->move_block = 0;
341
342	victim->head_ ()->insert (new_symptom);
343
344	// set owner last, as insert clears owner
345	new_symptom->set_owner (disease->owner);
346
347	return 1;
348	}
349
350	/* now deal with progressing diseases: we increase the debility
351	* caused by the symptoms.
352	*/
353	if (disease->stats.ac)
354	{
355	symptom->value = clamp (symptom->value + disease->stats.ac, 0, 100*100);
356
357	float scale = 1.f + symptom->value / 100.f;
358
359	/* now rescale all the debilities */
360	for (int i = 0; i < NUM_STATS; ++i)
361	symptom->stats.stat (i) = clamp (int (scale * disease->stats.stat (i)), -128, 127);
362
363	symptom->stats.dam = clamp (scale * disease->stats.dam , -1024, 1024);
364	symptom->stats.food = clamp (scale * disease->last_eat , -1024, 1024);
365	symptom->stats.maxsp = clamp (scale * disease->stats.maxsp, -1024, 1024);
366	symptom->stats.sp = clamp (scale * disease->stats.sp , -1024, 1024);
367	symptom->stats.hp = clamp (scale * disease->stats.hp , -1024, 1024);
368	symptom->stats.exp = 0;
369	symptom->last_sp = disease->last_sp ? clamp (disease->last_sp / scale, 1, 1024) : 0;
370	symptom->msg = disease->msg;
371	symptom->attacktype = disease->attacktype;
372	symptom->other_arch = disease->other_arch;
373	}
374
375	symptom->set_flag (FLAG_APPLIED);
376	victim->update_stats ();
377
378	return 1;
379	}
380
381	int
382	move_disease (object *disease)
383	{
384	/* First task is to determine if the disease is inside or outside of someone.
385	* If outside, we decrement 'value' until we're gone.
386	*/
387
388	if (!disease->env)
389	{ /* we're outside of someone */
390	if (disease->stats.maxhp > 0)
391	disease->value--;
392
393	if (!disease->value)
394	{
395	disease->destroy ();
396	return 1;
397	}
398	}
399	else
400	{
401	/* if we're inside a person, have the disease run its course */
402	/* negative/zero food denotes "perpetual" diseases. */
403	if (disease->stats.food > 0)
404	{
405	disease->stats.food--;
406
407	if (!disease->stats.food)
408	{
409	remove_symptoms (disease); /* remove the symptoms of this disease */
410	grant_immunity (disease);
411	disease->destroy ();
412	return 1;
413	}
414	}
415	}
416
417	/* check to see if we infect others */
418	check_infection (disease);
419
420	/* impose or modify the symptoms of the disease */
421	if (disease->env && is_susceptible_to_disease (disease->env, disease))
422	do_symptoms (disease);
423
424	return 0;
425	}
426
427	/* check to see if an object is infectable:
428	* objects with immunity aren't infectable.
429	* objects already infected aren't infectable.
430	* dead objects aren't infectable.
431	* undead objects are infectible only if specifically named.
432	*/
433	int
434	infect_object (object victim, object disease, int force)
435	{
436	object *tmp;
437	object *new_disease;
438
439	/* don't infect inanimate objects */
440	if (!victim->flag [FLAG_MONSTER] && !(victim->type == PLAYER))
441	return 0;
442
443	/* check and see if victim can catch disease: diseases
444	* are specific
445	*/
446	if (!is_susceptible_to_disease (victim, disease))
447	return 0;
448
449	/* roll the dice on infection before doing the inventory check! */
450	if (!force && (random_roll (0, 126, victim, PREFER_HIGH) >= disease->stats.wc))
451	return 0;
452
453	/* do an immunity check */
454
455	/* There used to (IMO) be a flaw in the below - it used to be the case
456	* that if level check was done for both immunity and disease. This could
457	* result in a person with multiple afflictions of the same disease
458	* (eg, level 1 cold, level 2 cold, level 3 cold, etc), as long as
459	* they were cast in that same order. Instead, change it so that
460	* if you diseased, you can't get diseased more.
461	*/
462
463	for (tmp = victim->head_ ()->inv; tmp; tmp = tmp->below)
464	if (tmp->name == disease->name && tmp->is_immunity () && tmp->level >= disease->level)
465	return 0; /* Immune! */
466	else if (tmp->type == DISEASE && tmp->name == disease->name)
467	return 0; /* already diseased */
468
469	/* If we've gotten this far, go ahead and infect the victim. */
470
471	new_disease = disease->clone ();
472
473	new_disease->stats.food = disease->stats.maxgrace;
474	new_disease->value = disease->stats.maxhp;
475	new_disease->stats.wc -= disease->last_grace; /* self-limiting factor */
476
477	/* This appears to be a horrible case of overloading 'NO_PASS'
478	* for meaning in the diseases.
479	*/
480	new_disease->move_block = 0;
481
482	// insert before setting the owner
483	victim->head_ ()->insert (new_disease);
484
485	if (disease->owner)
486	new_disease->set_owner (disease->owner);
487	else if (object *pl = disease->in_player ())
488	/* for diseases which are passed by hitting, set owner and skill */
489	new_disease->set_owner (pl);
490
491	if (INVOKE_OBJECT (INFECT, victim, ARG_OBJECT (disease), ARG_OBJECT (new_disease)))
492	return 1;
493
494	if (new_disease->owner && new_disease->owner->type == PLAYER)
495	{
496	const char *buf;
497
498	/* if the disease has a title, it has a special infection message
499	* This messages is printed in the form MESSAGE victim
500	*/
501	if (new_disease->title)
502	buf = format ("%s %s!!", &disease->title, &victim->name);
503	else
504	buf = format ("You infect %s with your disease, %s!", &victim->name, &new_disease->name);
505
506	if (victim->type == PLAYER)
507	new_draw_info (NDI_UNIQUE \| NDI_RED, 0, new_disease->owner, buf);
508	else
509	new_draw_info (0, 4, new_disease->owner, buf);
510	}
511
512	if (victim->type == PLAYER)
513	new_draw_info (NDI_UNIQUE \| NDI_RED, 0, victim, "You suddenly feel ill.");
514
515	return 1;
516	}
517
518	/* make the symptom do the nasty things it does */
519	int
520	move_symptom (object *symptom)
521	{
522	object *victim = symptom->env;
523
524	if (!victim \|\| !victim->map)
525	{ /* outside a monster/player, die immediately */
526	symptom->destroy ();
527	return 0;
528	}
529
530	/* create the symptom "other arch" object and drop it here
531	* under every part of the monster
532	* The victim may well have died.
533	*/
534	if (victim->map)
535	{
536	victim->play_sound (symptom->sound);
537
538	if (symptom->other_arch)
539	for (object *tmp = victim->head_ (); tmp; tmp = tmp->more)
540	{
541	object *new_ob = symptom->other_arch->instance ();
542	new_ob->x = tmp->x;
543	new_ob->y = tmp->y;
544	new_ob->map = victim->map;
545	insert_ob_in_map (new_ob, victim->map, victim, 0);
546	}
547	}
548
549	int damage =
550	symptom->stats.dam > 0
551	? symptom->stats.dam
552	: max (1, victim->stats.maxhp * -symptom->stats.dam / 100);
553
554	hit_player (victim, damage, symptom, symptom->attacktype, 1);
555
556	int sp_reduce =
557	symptom->stats.maxsp > 0
558	? symptom->stats.maxsp
559	: max (1, victim->stats.maxsp * -symptom->stats.maxsp / 100);
560
561	victim->stats.sp = max (0, victim->stats.sp - sp_reduce);
562
563	new_draw_info (NDI_UNIQUE \| NDI_RED, 0, victim, symptom->msg);
564
565	return 1;
566	}
567
568	/* possibly infect due to direct physical contact
569	* i.e., AT_PHYSICAL-- called from "hit_player_attacktype" */
570	int
571	check_physically_infect (object victim, object hitter)
572	{
573	/* search for diseases, give every disease a chance to infect */
574	for (object *disease = hitter->inv; disease; disease = disease->below)
575	if (disease->type == DISEASE)
576	infect_object (victim, disease, 0);
577
578	return 1;
579	}
580
581	/* do the cure disease stuff, from the spell "cure disease" */
582	int
583	cure_disease (object sufferer, object caster, object *spell)
584	{
585	object disease, next;
586	int cure = 0;
587
588	int casting_level = caster ? caster->level : 1000; /* if null caster, CURE all. */
589
590	for (disease = sufferer->inv; disease; disease = next)
591	{
592	next = disease->below;
593
594	if (disease->type == DISEASE)
595	{ /* attempt to cure this disease */
596	/* If caster level is higher than disease level, cure chance
597	* is automatic. If lower, then the chance is basically
598	* 1 in level_diff - if there is a 5 level difference, chance
599	* is 1 in 5.
600	*/
601	if ((casting_level >= disease->level) \|\| (!(random_roll (0, (disease->level - casting_level - 1), caster, PREFER_LOW))))
602	{
603	remove_symptoms (disease);
604	cure = 1;
605
606	if (caster && spell)
607	change_exp (caster, disease->stats.exp, spell->skill, SK_EXP_SKILL_ONLY);
608
609	disease->destroy ();
610	}
611	}
612	}
613
614	if (cure)
615	{
616	/* Only draw these messages once */
617	if (caster)
618	new_draw_info_format (NDI_UNIQUE, 0, caster, "You cure a disease!");
619
620	new_draw_info (NDI_UNIQUE, 0, sufferer, "You no longer feel diseased.");
621	}
622
623	return 1;
624	}
625
626	#if 0 // unused, but seems interesting
627	/* reduces disease progression: reduce_symptoms
628	* return true if we actually reduce a disease.
629	*/
630	static int
631	reduce_symptoms (object *sufferer, int reduction)
632	{
633	object *walk;
634	int success = 0;
635
636	for (walk = sufferer->inv; walk; walk = walk->below)
637	{
638	if (walk->type == SYMPTOM)
639	{
640	if (walk->value > 0)
641	{
642	success = 1;
643	walk->value = max (0, walk->value - 2 * reduction);
644	/* give the disease time to modify this symptom,
645	* and reduce its severity. */
646	walk->speed_left = 0;
647	}
648	}
649	}
650
651	if (success)
652	new_draw_info (NDI_UNIQUE, 0, sufferer, "Your illness seems less severe.");
653
654	return success;
655	}
656	#endif