server/server/skills.C

/*
 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
 * 
 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
 * Copyright (©) 2003,2007 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Crossfire TRT is free software: you can redistribute it and/or modify
 * it under the terms of the 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 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 <crossfire@schmorp.de>
 */

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

/* adj_stealchance() - increased values indicate better attempts */
static int
adj_stealchance (object *op, object *victim, int roll)
{
  object *equip;

  if (!op || !victim || !roll)
    return -1;

  /* Only prohibit stealing if the player does not have a free
   * hand available and in fact does have hands.
   */
  if (op->type == PLAYER && op->slot[body_arm].used <= 0 && op->slot[body_arm].info)
    {
      new_draw_info (NDI_UNIQUE, 0, op, "But you have no free hands to steal with!");
      return -1;
    }

  /* ADJUSTMENTS */

  /* Its harder to steal from hostile beings! */
  if (!QUERY_FLAG (victim, FLAG_UNAGGRESSIVE))
    roll = roll / 2;

  /* Easier to steal from sleeping beings, or if the thief is 
   * unseen */
  if (QUERY_FLAG (victim, FLAG_SLEEP))
    roll = roll * 3;
  else if (op->invisible)
    roll = roll * 2;

  /* check stealing 'encumberance'. Having this equipment applied makes
   * it quite a bit harder to steal. 
   */
  for (equip = op->inv; equip; equip = equip->below)
    {
      if (equip->type == WEAPON && QUERY_FLAG (equip, FLAG_APPLIED))
        {
          roll -= equip->weight / 10000;
        }
      if (equip->type == BOW && QUERY_FLAG (equip, FLAG_APPLIED))
        roll -= equip->weight / 5000;
      if (equip->type == SHIELD && QUERY_FLAG (equip, FLAG_APPLIED))
        {
          roll -= equip->weight / 2000;
        }
      if (equip->type == ARMOUR && QUERY_FLAG (equip, FLAG_APPLIED))
        roll -= equip->weight / 5000;
      if (equip->type == GLOVES && QUERY_FLAG (equip, FLAG_APPLIED))
        roll -= equip->weight / 100;
    }
  if (roll < 0)
    roll = 0;
  return roll;
}

/* 
 * When stealing: dependent on the intelligence/wisdom of whom you're
 * stealing from (op in attempt_steal), offset by your dexterity and
 * skill at stealing. They may notice your attempt, whether successful
 * or not. 
 * op is the target (person being pilfered)
 * who is the person doing the stealing.
 * skill is the skill object (stealing).
 */
static int
attempt_steal (object *op, object *who, object *skill)
{
  object *success = NULL, *tmp = NULL, *next;
  int roll = 0, chance = 0, stats_value;
  rv_vector rv;

  stats_value = ((who->stats.Dex + who->stats.Int) * 3) / 2;

  /* if the victim is aware of a thief in the area (FLAG_NO_STEAL set on them)
   * they will try to prevent stealing if they can. Only unseen theives will
   * have much chance of success. 
   */
  if (op->type != PLAYER && QUERY_FLAG (op, FLAG_NO_STEAL))
    {
      if (can_detect_enemy (op, who, &rv))
        {
          npc_call_help (op);
          CLEAR_FLAG (op, FLAG_UNAGGRESSIVE);
          new_draw_info (NDI_UNIQUE, 0, who, "Your attempt is prevented!");
          return 0;
        }
      else                      /* help npc to detect thief next time by raising its wisdom */
        op->stats.Wis += (op->stats.Int / 5) + 1;
      if (op->stats.Wis > MAX_STAT)
        op->stats.Wis = MAX_STAT;
    }

  if (op->type == PLAYER && QUERY_FLAG (op, FLAG_WIZ))
    {
      new_draw_info (NDI_UNIQUE, 0, who, "You can't steal from the dungeon master!\n");
      return 0;
    }

  // only allow stealing between hostile players (TODO: probably should change)
  if (op->type == PLAYER && who->type == PLAYER && (who->contr->peaceful || op->contr->peaceful))
    {
      new_draw_info (NDI_UNIQUE, 0, who, "You can't steal from other players!\n");
      return 0;
    }

  /* Ok then, go thru their inventory, stealing */
  for (tmp = op->inv; tmp; tmp = next)
    {
      next = tmp->below;

      /* you can't steal worn items, starting items, wiz stuff, 
       * innate abilities, or items w/o a type. Generally 
       * speaking, the invisibility flag prevents experience or
       * abilities from being stolen since these types are currently
       * always invisible objects. I was implicit here so as to prevent
       * future possible problems. -b.t. 
       * Flesh items generated w/ fix_flesh_item should have FLAG_NO_STEAL 
       * already  -b.t. 
       */

      if (QUERY_FLAG (tmp, FLAG_APPLIED)
          || !tmp->type
          || tmp->type == SPELL
          || QUERY_FLAG (tmp, FLAG_STARTEQUIP)
          || QUERY_FLAG (tmp, FLAG_NO_STEAL)
          || tmp->invisible)
        continue;

      /* Okay, try stealing this item. Dependent on dexterity of thief,
       * skill level, see the adj_stealroll fctn for more detail. 
       */

      roll = die_roll (2, 100, who, PREFER_LOW) / 2;    /* weighted 1-100 */

      if ((chance = adj_stealchance (who, op, (stats_value + skill->level * 10 - op->level * 3))) == -1)
        return 0;
      else if (roll < chance)
        {
          pick_up (who, tmp);
          /* need to see if the player actually stole this item -
           * if it is in the players inv, assume it is.  This prevents
           * abuses where the player can not carry the item, so just
           * keeps stealing it over and over.
           */
          if (tmp->destroyed () || tmp->env != op)
            {
              /* for players, play_sound: steals item */
              success = tmp;
              CLEAR_FLAG (tmp, FLAG_INV_LOCKED);

              /* Don't delete it from target player until we know
               * the thief has picked it up.  can't just look at tmp->count,
               * as it's possible that it got merged when picked up.
               */
              if (op->type == PLAYER)
                esrv_del_item (op->contr, tmp->count);
            }
          break;
        }
    }                           /* for loop looking for an item */

  if (!tmp)
    {
      new_draw_info_format (NDI_UNIQUE, 0, who, "%s%s has nothing you can steal!", op->type == PLAYER ? "" : "The ", query_name (op));
      return 0;
    }

  /* If you arent high enough level, you might get something BUT
   * the victim will notice your stealing attempt. Ditto if you
   * attempt to steal something heavy off them, they're bound to notice 
   */

  if ((roll >= skill->level) || !chance
      || (tmp && tmp->weight > (250 * (random_roll (0, stats_value + skill->level * 10 - 1, who, PREFER_LOW)))))
    {

      /* victim figures out where the thief is! */
      if (who->hide)
        make_visible (who);

      if (op->type != PLAYER)
        {
          /* The unaggressives look after themselves 8) */
          if (who->type == PLAYER)
            {
              npc_call_help (op);
              new_draw_info_format (NDI_UNIQUE, 0, who, "%s notices your attempted pilfering!", query_name (op));
            }
          CLEAR_FLAG (op, FLAG_UNAGGRESSIVE);
          /* all remaining npc items are guarded now. Set flag NO_STEAL 
           * on the victim. 
           */
          SET_FLAG (op, FLAG_NO_STEAL);
        }
      else
        {                       /* stealing from another player */
          char buf[MAX_BUF];

          /* Notify the other player */
          if (success && who->stats.Int > random_roll (0, 19, op, PREFER_LOW))
            {
              sprintf (buf, "Your %s is missing!", query_name (success));
            }
          else
            {
              sprintf (buf, "Your pack feels strangely lighter.");
            }
          new_draw_info (NDI_UNIQUE, 0, op, buf);
          if (!success)
            {
              if (who->invisible)
                {
                  sprintf (buf, "you feel itchy fingers getting at your pack.");
                }
              else
                {
                  sprintf (buf, "%s looks very shifty.", query_name (who));
                }
              new_draw_info (NDI_UNIQUE, 0, op, buf);
            }
        }                       /* else stealing from another player */
      /* play_sound("stop! thief!"); kindofthing */
    }                           /* if you weren't 100% successful */
  return success ? 1 : 0;
}

int
steal (object *op, int dir, object *skill)
{
  object *tmp, *next;
  sint16 x, y;
  maptile *m;
  int mflags;

  x = op->x + freearr_x[dir];
  y = op->y + freearr_y[dir];

  if (dir == 0)
    {
      /* Can't steal from ourself! */
      return 0;
    }

  m = op->map;
  mflags = get_map_flags (m, &m, x, y, &x, &y);
  /* Out of map - can't do it.  If nothing alive on this space,
   * don't need to look any further.
   */
  if ((mflags & P_OUT_OF_MAP) || !(mflags & P_IS_ALIVE))
    return 0;

  /* If player can't move onto the space, can't steal from it. */
  if (OB_TYPE_MOVE_BLOCK (op, GET_MAP_MOVE_BLOCK (m, x, y)))
    return 0;

  /* Find the topmost object at this spot */
  for (tmp = GET_MAP_OB (m, x, y); tmp != NULL && tmp->above != NULL; tmp = tmp->above);

  /* For all the stacked objects at this point, attempt a steal */
  for (; tmp != NULL; tmp = next)
    {
      next = tmp->below;
      /* Minor hack--for multi square beings - make sure we get 
       * the 'head' coz 'tail' objects have no inventory! - b.t. 
       */
      if (tmp->head)
        tmp = tmp->head;

      if (tmp->type != PLAYER && !QUERY_FLAG (tmp, FLAG_MONSTER))
        continue;

      /* do not reveal hidden DMs */
      if (tmp->type == PLAYER && QUERY_FLAG (tmp, FLAG_WIZ) && tmp->contr->hidden)
        continue;
      if (attempt_steal (tmp, op, skill))
        {
          if (tmp->type == PLAYER)      /* no xp for stealing from another player */
            return 0;

          /* no xp for stealing from pets (of players) */
          if (QUERY_FLAG (tmp, FLAG_FRIENDLY) && tmp->attack_movement == PETMOVE)
            {
              object *owner = tmp->owner;

              if (owner != NULL && owner->type == PLAYER)
                return 0;
            }

          // reduce monster experience by experience we gained, as to
          // limit the amount of exp that can be gained by stealing from monsters
          // (jessies gave ~20,000,000 exp otherwise.
          int exp = calc_skill_exp (op, tmp, skill);

          exp = MIN (tmp->stats.exp, exp);
          tmp->stats.exp -= exp;
          return exp;
        }
    }
  return 0;
}

static int
attempt_pick_lock (object *door, object *pl, object *skill)
{
  int difficulty = pl->map->difficulty ? pl->map->difficulty : 0;
  int success = 0, number;      /* did we get anything? */


  /* Try to pick the lock on this item (doors only for now). 
   * Dependent on dexterity/skill SK_level of the player and  
   * the map level difficulty. 
   */
  number = (die_roll (2, 40, pl, PREFER_LOW) - 2) / 2;
  if (number < (pl->stats.Dex + skill->level - difficulty))
    {
      remove_door (door);
      success = 1;
    }
  else if (door->inv && (door->inv->type == RUNE || door->inv->type == TRAP))
    {                           /* set off any traps? */
      spring_trap (door->inv, pl);
    }
  return success;
}


/* Implementation by bt. (thomas@astro.psu.edu)
 * monster implementation 7-7-95 by bt.
 */

int
pick_lock (object *pl, int dir, object *skill)
{
  object *tmp;
  int x = pl->x + freearr_x[dir];
  int y = pl->y + freearr_y[dir];

  if (!dir)
    dir = pl->facing;

  /* For all the stacked objects at this point find a door */
  if (out_of_map (pl->map, x, y))
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "There is no lock there.");
      return 0;
    }

  for (tmp = GET_MAP_OB (pl->map, x, y); tmp; tmp = tmp->above)
    if (tmp->type == DOOR || tmp->type == LOCKED_DOOR)
      break;

  if (!tmp)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "There is no lock there.");
      return 0;
    }
  if (tmp->type == LOCKED_DOOR)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You can't pick that lock!");
      return 0;
    }

  if (!tmp->move_block)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "The door has no lock!");
      return 0;
    }

  if (attempt_pick_lock (tmp, pl, skill))
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You pick the lock.");
      return calc_skill_exp (pl, NULL, skill);
    }
  else
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You fail to pick the lock.");
      return 0;
    }
}

/* HIDE CODE. The user becomes undetectable (not just 'invisible') for
 * a short while (success and duration dependant on player SK_level,
 * dexterity, charisma, and map difficulty). 
 * Players have a good chance of becoming 'unhidden' if they move
 * and like invisiblity will be come visible if they attack
 * Implemented by b.t. (thomas@astro.psu.edu)
 * July 7, 1995 - made hiding possible for monsters. -b.t.
 */
static int
attempt_hide (object *op, object *skill)
{
  int number, difficulty = op->map->difficulty;
  int terrain = hideability (op);

  if (terrain < -10)            /* not enough cover here */
    return 0;

  /*  Hiding success and duration dependant on skill level,
   *  op->stats.Dex, map difficulty and terrain. 
   */
  number = (die_roll (2, 25, op, PREFER_LOW) - 2) / 2;

  if (!stand_near_hostile (op) && (number < (op->stats.Dex + skill->level + terrain - difficulty)))
    {
      op->invisible += 100;     /* set the level of 'hiddeness' */

      if (op->type == PLAYER)
        op->contr->tmp_invis = 1;

      op->hide = 1;
      return 1;
    }

  return 0;
}

/* patched this to take terrain into consideration */
int
hide (object *op, object *skill)
{
  /* the preliminaries -- Can we really hide now? */
  /* this keeps monsters from using invisibilty spells and hiding */

  if (QUERY_FLAG (op, FLAG_MAKE_INVIS))
    {
      new_draw_info (NDI_UNIQUE, 0, op, "You don't need to hide while invisible!");
      return 0;
    }
  else if (!op->hide && op->invisible > 0 && op->type == PLAYER)
    {
      new_draw_info (NDI_UNIQUE, 0, op, "Your attempt to hide breaks the invisibility spell!");
      make_visible (op);
    }

  if (op->invisible > 50 * skill->level)
    {
      new_draw_info (NDI_UNIQUE, 0, op, "You are as hidden as you can get.");
      return 0;
    }

  if (attempt_hide (op, skill))
    {
      new_draw_info (NDI_UNIQUE, 0, op, "You hide in the shadows.");
      update_object (op, UP_OBJ_FACE);
      return calc_skill_exp (op, NULL, skill);
    }

  new_draw_info (NDI_UNIQUE, 0, op, "You fail to conceal yourself.");
  return 0;
}

/* stop_jump() - End of jump. Clear flags, restore the map, and 
 * freeze the jumper a while to simulate the exhaustion
 * of jumping.
 */
static void
stop_jump (object *pl, int dist, int spaces)
{
  pl->update_stats ();
  pl->map->insert (pl, pl->x, pl->y, pl);
}

static int
attempt_jump (object *pl, int dir, int spaces, object *skill)
{
  object *tmp;
  int i, exp = 0, dx = freearr_x[dir], dy = freearr_y[dir], mflags;
  sint16 x, y;
  maptile *m;

  /* Jump loop. Go through spaces opject wants to jump. Halt the
   * jump if a wall or creature is in the way. We set FLAG_FLYING
   * temporarily to allow player to aviod exits/archs that are not 
   * fly_on, fly_off. This will also prevent pickup of objects
   * while jumping over them.  
   */

  pl->remove ();

  /* 
   * I don't think this is actually needed - all the movement
   * code is handled in this function, and I don't see anyplace
   * that cares about the move_type being flying.
   */
  pl->move_type |= MOVE_FLY_LOW;

  for (i = 0; i <= spaces; i++)
    {
      x = pl->x + dx;
      y = pl->y + dy;
      m = pl->map;

      mflags = get_map_flags (m, &m, x, y, &x, &y);

      if (mflags & P_OUT_OF_MAP)
        {
          (void) stop_jump (pl, i, spaces);
          return 0;
        }
      if (OB_TYPE_MOVE_BLOCK (pl, GET_MAP_MOVE_BLOCK (m, x, y)))
        {
          new_draw_info (NDI_UNIQUE, 0, pl, "Your jump is blocked.");
          stop_jump (pl, i, spaces);
          return 0;
        }

      for (tmp = GET_MAP_OB (m, x, y); tmp; tmp = tmp->above)
        {
          /* Jump into creature */
          if (QUERY_FLAG (tmp, FLAG_MONSTER) || (tmp->type == PLAYER && (!QUERY_FLAG (tmp, FLAG_WIZ) || !tmp->contr->hidden)))
            {
              new_draw_info_format (NDI_UNIQUE, 0, pl, "You jump into %s%s.", tmp->type == PLAYER ? "" : "the ", &tmp->name);
              if (tmp->type != PLAYER ||
                  (pl->type == PLAYER && pl->contr->party == NULL) ||
                  (pl->type == PLAYER && tmp->type == PLAYER && pl->contr->party != tmp->contr->party))
                exp = skill_attack (tmp, pl, pl->facing, "kicked", skill);      /* pl makes an attack */
              stop_jump (pl, i, spaces);
              return exp;       /* note that calc_skill_exp() is already called by skill_attack() */
            }
          /* If the space has fly on set (no matter what the space is),
           * we should get the effects - after all, the player is
           * effectively flying.
           */
          if (tmp->move_on & MOVE_FLY_LOW)
            {
              pl->x = x;
              pl->y = y;
              pl->map = m;
              stop_jump (pl, i, spaces);
              return calc_skill_exp (pl, NULL, skill);
            }
        }
      pl->x = x;
      pl->y = y;
      pl->map = m;
    }
  stop_jump (pl, i, spaces);
  return calc_skill_exp (pl, NULL, skill);
}

/* jump() - this is both a new type of movement for player/monsters and
 * an attack as well.
 * Perhaps we should allow more spaces based on level, eg, level 50
 * jumper can jump several spaces?
 */

int
jump (object *pl, int dir, object *skill)
{
  int spaces = 0, stats;
  int str = pl->stats.Str;
  int dex = pl->stats.Dex;

  dex = dex ? dex : 15;
  str = str ? str : 10;

  stats = str * str * str * dex * skill->level;

  if (pl->carrying != 0)        /* don't want div by zero !! */
    spaces = (int) (stats / pl->carrying);
  else
    spaces = 2;                 /* pl has no objects - gets the far jump */

  if (spaces > 2)
    spaces = 2;
  else if (spaces == 0)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You are carrying too much weight to jump.");
      return 0;
    }
  return attempt_jump (pl, dir, spaces, skill);
}


/* skill_ident() - this code is supposed to allow players to identify 
 * classes of objects with the various "auto-ident" skills. Player must 
 * have unidentified objects of the right type in order for the skill
 * to work. While multiple classes of objects may be identified, 
 * this code is kind of yucky -- it would be nice to make it a bit
 * more generalized. Right now, skill indices are embedded in this routine.  
 * Returns amount of experience gained (on successful ident).
 * - b.t. (thomas@astro.psu.edu) 
 */

static int
do_skill_detect_curse (object *pl, object *skill)
{
  object *tmp;
  int success = 0;

  for (tmp = pl->inv; tmp; tmp = tmp->below)
    if (!tmp->invisible
        && !QUERY_FLAG (tmp, FLAG_IDENTIFIED) && !QUERY_FLAG (tmp, FLAG_KNOWN_CURSED)
        && (QUERY_FLAG (tmp, FLAG_CURSED) || QUERY_FLAG (tmp, FLAG_DAMNED)) && tmp->item_power < skill->level)
      {
        SET_FLAG (tmp, FLAG_KNOWN_CURSED);
        esrv_update_item (UPD_FLAGS, pl, tmp);
        success += calc_skill_exp (pl, tmp, skill);
      }

  /* Check ground, too, but only objects the player could pick up */
  for (tmp = GET_MAP_OB (pl->map, pl->x, pl->y); tmp; tmp = tmp->above)
    if (can_pick (pl, tmp) &&
        !QUERY_FLAG (tmp, FLAG_IDENTIFIED) &&
        !QUERY_FLAG (tmp, FLAG_KNOWN_CURSED)
        && (QUERY_FLAG (tmp, FLAG_CURSED) || QUERY_FLAG (tmp, FLAG_DAMNED)) && tmp->item_power < skill->level)
      {
        SET_FLAG (tmp, FLAG_KNOWN_CURSED);
        esrv_update_item (UPD_FLAGS, pl, tmp);
        success += calc_skill_exp (pl, tmp, skill);
      }

  return success;
}

static int
do_skill_detect_magic (object *pl, object *skill)
{
  object *tmp;
  int success = 0;

  for (tmp = pl->inv; tmp; tmp = tmp->below)
    if (!tmp->invisible
        && !QUERY_FLAG (tmp, FLAG_IDENTIFIED) && !QUERY_FLAG (tmp, FLAG_KNOWN_MAGICAL)
        && (is_magical (tmp)) && tmp->item_power < skill->level)
      {
        SET_FLAG (tmp, FLAG_KNOWN_MAGICAL);
        esrv_update_item (UPD_FLAGS, pl, tmp);
        success += calc_skill_exp (pl, tmp, skill);
      }

  /* Check ground, too, but like above, only if the object can be picked up */
  for (tmp = GET_MAP_OB (pl->map, pl->x, pl->y); tmp; tmp = tmp->above)
    if (can_pick (pl, tmp) &&
        !QUERY_FLAG (tmp, FLAG_IDENTIFIED) && !QUERY_FLAG (tmp, FLAG_KNOWN_MAGICAL) && (is_magical (tmp)) && tmp->item_power < skill->level)
      {
        SET_FLAG (tmp, FLAG_KNOWN_MAGICAL);
        esrv_update_item (UPD_FLAGS, pl, tmp);
        success += calc_skill_exp (pl, tmp, skill);
      }

  return success;
}

/* Helper function for do_skill_ident, so that we can loop
 * over inventory AND objects on the ground conveniently.  
 */
int
do_skill_ident2 (object *tmp, object *pl, int obj_class, object *skill)
{
  int success = 0, chance;
  int skill_value = skill->level * pl->stats.Int ? pl->stats.Int : 10;

  if (!QUERY_FLAG (tmp, FLAG_IDENTIFIED) && !QUERY_FLAG (tmp, FLAG_NO_SKILL_IDENT)
      && need_identify (tmp) && !tmp->invisible && tmp->type == obj_class)
    {
      chance = die_roll (3, 10, pl, PREFER_LOW) - 3 + rndm (0, (tmp->magic ? tmp->magic * 5 : 1) - 1);

      if (skill_value >= chance)
        {
          identify (tmp);

          if (pl->type == PLAYER)
            {
              new_draw_info_format (NDI_UNIQUE, 0, pl, "You identify %s.", long_desc (tmp, pl));

              if (tmp->msg)
                {
                  new_draw_info (NDI_UNIQUE, 0, pl, "The item has a story:");
                  new_draw_info (NDI_UNIQUE, 0, pl, tmp->msg);
                }

              /* identify will take care of updating the item if it is in the players inventory. IF on map, do it here */
              if (tmp->map)
                esrv_send_item (pl, tmp);
            }
          success += calc_skill_exp (pl, tmp, skill);
        }
      else
        SET_FLAG (tmp, FLAG_NO_SKILL_IDENT);
    }

  return success;
}

/* do_skill_ident() - workhorse for skill_ident() -b.t.
 */
static int
do_skill_ident (object *pl, int obj_class, object *skill)
{
  object *tmp;
  int success = 0;

  for (tmp = pl->inv; tmp; tmp = tmp->below)
    success += do_skill_ident2 (tmp, pl, obj_class, skill);
  /*  check the ground */

  for (tmp = GET_MAP_OB (pl->map, pl->x, pl->y); tmp; tmp = tmp->above)
    success += do_skill_ident2 (tmp, pl, obj_class, skill);

  return success;
}

int
skill_ident (object *pl, object *skill)
{
  int success = 0;

  if (pl->type != PLAYER)
    return 0;                   /* only players will skill-identify */

  new_draw_info (NDI_UNIQUE, 0, pl, "You look at the objects nearby...");

  switch (skill->subtype)
    {
        case SK_SMITHERY:
          success += do_skill_ident (pl, WEAPON, skill) + do_skill_ident (pl, ARMOUR, skill)
            + do_skill_ident (pl, BRACERS, skill) + do_skill_ident (pl, CLOAK, skill)
            + do_skill_ident (pl, BOOTS, skill) + do_skill_ident (pl, SHIELD, skill)
            + do_skill_ident (pl, GIRDLE, skill) + do_skill_ident (pl, HELMET, skill) + do_skill_ident (pl, GLOVES, skill);
          break;

        case SK_BOWYER:
          success += do_skill_ident (pl, BOW, skill) + do_skill_ident (pl, ARROW, skill);
          break;

        case SK_ALCHEMY:
          success += do_skill_ident (pl, POTION, skill) + do_skill_ident (pl, POISON, skill)
            + do_skill_ident (pl, CONTAINER, skill) + do_skill_ident (pl, DRINK, skill) + do_skill_ident (pl, INORGANIC, skill);
          break;

        case SK_WOODSMAN:
          success += do_skill_ident (pl, FOOD, skill) + do_skill_ident (pl, DRINK, skill) + do_skill_ident (pl, FLESH, skill);
          break;

        case SK_JEWELER:
          success += do_skill_ident (pl, GEM, skill) + do_skill_ident (pl, RING, skill) + do_skill_ident (pl, AMULET, skill);
          break;

        case SK_LITERACY:
          success += do_skill_ident (pl, SPELLBOOK, skill) + do_skill_ident (pl, SCROLL, skill) + do_skill_ident (pl, BOOK, skill);
          break;

        case SK_THAUMATURGY:
          success += do_skill_ident (pl, WAND, skill) + do_skill_ident (pl, ROD, skill) + do_skill_ident (pl, HORN, skill);
          break;

        case SK_DET_CURSE:
          success = do_skill_detect_curse (pl, skill);
          if (success)
            new_draw_info (NDI_UNIQUE, 0, pl, "...and discover cursed items!");
          break;

        case SK_DET_MAGIC:
          success = do_skill_detect_magic (pl, skill);
          if (success)
            new_draw_info (NDI_UNIQUE, 0, pl, "...and discover items imbued with mystic forces!");
          break;

        default:
          LOG (llevError, "Error: bad call to skill_ident()\n");
          return 0;
          break;
    }
  if (!success)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "...and learn nothing more.");
    }
  return success;
}

/* players using this skill can 'charm' a monster --
 * into working for them. It can only be used on 
 * non-special (see below) 'neutral' creatures. 
 * -b.t. (thomas@astro.psu.edu)
 */
int
use_oratory (object *pl, int dir, object *skill)
{
  if (pl->type != PLAYER)
    return 0;                   /* only players use this skill */

  sint16 x = pl->x + freearr_x[dir],
         y = pl->y + freearr_y[dir];
  maptile *m = pl->map;

  int mflags = get_map_flags (m, &m, x, y, &x, &y);
  if (mflags & P_OUT_OF_MAP)
    return 0;

  /* Save some processing - we have the flag already anyways
   */
  if (!(mflags & P_IS_ALIVE))
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "There is nothing to orate to.");
      return 0;
    }

  object *tmp;
  for (tmp = GET_MAP_OB (m, x, y); tmp; tmp = tmp->above)
    {
      /* can't persuade players - return because there is nothing else
       * on that space to charm.  Same for multi space monsters and
       * special monsters - we don't allow them to be charmed, and there
       * is no reason to do further processing since they should be the
       * only monster on the space.
       */
      if (tmp->type == PLAYER
          || tmp->more || tmp->head_ () != tmp
          || tmp->msg)
        return 0;

      if (QUERY_FLAG (tmp, FLAG_MONSTER))
        break;
    }

  if (!tmp)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "There is nothing to orate to.");
      return 0;
    }

  new_draw_info_format (NDI_UNIQUE, 0, pl, "You orate to the %s.", query_name (tmp));

  /* the following conditions limit who may be 'charmed' */

  /* it's hostile! */
  if (!QUERY_FLAG (tmp, FLAG_UNAGGRESSIVE) && !QUERY_FLAG (tmp, FLAG_FRIENDLY))
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl, "Too bad the %s isn't listening!\n", query_name (tmp));
      return 0;
    }

  /* it's already allied! */
  if (QUERY_FLAG (tmp, FLAG_FRIENDLY) && tmp->attack_movement == PETMOVE)
    {
      if (tmp->owner == pl)
        {
          new_draw_info (NDI_UNIQUE, 0, pl, "Your follower loves your speech.\n");
          return 0;
        }
      else if (skill->level > tmp->level)
        {
          /* you steal the follower.  Perhaps we should really look at the
           * level of the owner above?
           */
          tmp->set_owner (pl);
          tmp->skill = skill->skill;

          new_draw_info_format (NDI_UNIQUE, 0, pl, "You convince the %s to follow you instead!\n", query_name (tmp));
          /* Abuse fix - don't give exp since this can otherwise
           * be used by a couple players to gets lots of exp.
           */
          return 0;
        }
      else
        {
          /* In this case, you can't steal it from the other player */
          return 0;
        }
    }                           /* Creature was already a pet of someone */

  int level = skill->level + (pl->stats.Cha - tmp->stats.Int) / 2;

  /* Ok, got a 'sucker' lets try to make them a follower */
  if (level > 0 && tmp->level < (random_roll (0, level - 1, pl, PREFER_HIGH) - 1))
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl, "You convince the %s to become your follower.\n", query_name (tmp));

      tmp->set_owner (pl);
      tmp->skill = skill->skill;
      tmp->stats.exp = 0;
      add_friendly_object (tmp);
      tmp->attack_movement = PETMOVE;
      return calc_skill_exp (pl, tmp, skill);
    }
  /* Charm failed.  Creature may be angry now */
  else if ((skill->level + ((pl->stats.Cha - 10) / 2)) < random_roll (1, 2 * tmp->level, pl, PREFER_LOW))
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl, "Your speech angers the %s!\n", query_name (tmp));
      if (QUERY_FLAG (tmp, FLAG_FRIENDLY))
        {
          CLEAR_FLAG (tmp, FLAG_FRIENDLY);
          remove_friendly_object (tmp);
          tmp->attack_movement = 0;     /* needed? */
        }

      CLEAR_FLAG (tmp, FLAG_UNAGGRESSIVE);
    }

  return 0;                     /* Fall through - if we get here, we didn't charm anything */
}

/* Singing() -this skill allows the player to pacify nearby creatures.
 * There are few limitations on who/what kind of 
 * non-player creatures that may be pacified. Right now, a player
 * may pacify creatures which have Int == 0. In this routine, once
 * successfully pacified the creature gets Int=1. Thus, a player 
 * may only pacify a creature once. 
 * BTW, I appologize for the naming of the skill, I couldnt think
 * of anything better! -b.t. 
 */
int
singing (object *pl, int dir, object *skill)
{
  int i, exp = 0;
  object *tmp;
  maptile *m;
  sint16 x, y;

  if (pl->type != PLAYER)
    return 0;                   /* only players use this skill */

  new_draw_info_format (NDI_UNIQUE, 0, pl, "You sing.");
  for (i = 0; i < MIN (skill->level, SIZEOFFREE); i++)
    {
      x = pl->x + freearr_x[i];
      y = pl->y + freearr_y[i];
      m = pl->map;

      int mflags = get_map_flags (m, &m, x, y, &x, &y);
      if (mflags & P_OUT_OF_MAP)
        continue;
      if (!(mflags & P_IS_ALIVE))
        continue;

      for (tmp = GET_MAP_OB (m, x, y); tmp; tmp = tmp->above)
        {
          if (QUERY_FLAG (tmp, FLAG_MONSTER))
            break;
          /* can't affect players */
          if (tmp->type == PLAYER)
            break;
        }

      /* Whole bunch of checks to see if this is a type of monster that would
       * listen to singing.
       */
      if (tmp && QUERY_FLAG (tmp, FLAG_MONSTER) && !QUERY_FLAG (tmp, FLAG_NO_STEAL) &&  /* Been charmed or abused before */
          !QUERY_FLAG (tmp, FLAG_SPLITTING) &&  /* no ears */
          !QUERY_FLAG (tmp, FLAG_HITBACK) &&    /* was here before */
          (tmp->level <= skill->level) && (!tmp->head) && !QUERY_FLAG (tmp, FLAG_UNDEAD) && !QUERY_FLAG (tmp, FLAG_UNAGGRESSIVE) &&     /* already calm */
          !QUERY_FLAG (tmp, FLAG_FRIENDLY))
        {                       /* already calm */

          /* stealing isn't really related (although, maybe it should
           * be).  This is mainly to prevent singing to the same monster
           * over and over again and getting exp for it.
           */
          int level = skill->level + (pl->stats.Cha - 5 - tmp->stats.Int) / 2;

          if (level && tmp->level < random_roll (0, level - 1, pl, PREFER_HIGH))
            {
              SET_FLAG (tmp, FLAG_UNAGGRESSIVE);
              new_draw_info_format (NDI_UNIQUE, 0, pl, "You calm down the %s\n", query_name (tmp));
              /* Give exp only if they are not aware */

              if (!QUERY_FLAG (tmp, FLAG_NO_STEAL))
                exp += calc_skill_exp (pl, tmp, skill);

              SET_FLAG (tmp, FLAG_NO_STEAL);
            }
          else
            {
              new_draw_info_format (NDI_UNIQUE, 0, pl, "Too bad the %s isn't listening!\n", query_name (tmp));
              SET_FLAG (tmp, FLAG_NO_STEAL);
            }
        }
    }
  return exp;
}

/* The find_traps skill (aka, search).  Checks for traps
 * on the spaces or in certain objects
 */

int
find_traps (object *pl, object *skill)
{
  object *tmp, *tmp2;
  int i, expsum = 0, mflags;
  sint16 x, y;
  maptile *m;

  /* First we search all around us for runes and traps, which are
   * all type RUNE 
   */

  for (i = 0; i < 9; i++)
    {
      x = pl->x + freearr_x[i];
      y = pl->y + freearr_y[i];
      m = pl->map;

      mflags = get_map_flags (m, &m, x, y, &x, &y);
      if (mflags & P_OUT_OF_MAP)
        continue;

      /*  Check everything in the square for trapness */
      for (tmp = GET_MAP_OB (m, x, y); tmp != NULL; tmp = tmp->above)
        {

          /* And now we'd better do an inventory traversal of each
           * of these objects' inventory
           * We can narrow this down a bit - no reason to search through
           * the players inventory or monsters for that matter.
           */
          if (tmp->type != PLAYER && !QUERY_FLAG (tmp, FLAG_MONSTER))
            {
              for (tmp2 = tmp->inv; tmp2 != NULL; tmp2 = tmp2->below)
                if (tmp2->type == RUNE || tmp2->type == TRAP)
                  if (trap_see (pl, tmp2))
                    {
                      trap_show (tmp2, tmp);
                      if (tmp2->stats.Cha > 1)
                        {
                          if (!tmp2->owner || tmp2->owner->type != PLAYER)
                            expsum += calc_skill_exp (pl, tmp2, skill);

                          tmp2->stats.Cha = 1;  /* unhide the trap */
                        }
                    }
            }
          if ((tmp->type == RUNE || tmp->type == TRAP) && trap_see (pl, tmp))
            {
              trap_show (tmp, tmp);
              if (tmp->stats.Cha > 1)
                {
                  if (!tmp->owner || tmp->owner->type != PLAYER)
                    expsum += calc_skill_exp (pl, tmp, skill);
                  tmp->stats.Cha = 1;   /* unhide the trap */
                }
            }
        }
    }
  new_draw_info (NDI_BLACK, 0, pl, "You search the area.");
  return expsum;
}

/* remove_trap() - This skill will disarm any previously discovered trap 
 * the algorithm is based (almost totally) on the old command_disarm() - b.t. 
 */

int
remove_trap (object *op, int dir, object *skill)
{
  object *tmp, *tmp2;
  int i, success = 0, mflags;
  maptile *m;
  sint16 x, y;

  for (i = 0; i < 9; i++)
    {
      x = op->x + freearr_x[i];
      y = op->y + freearr_y[i];
      m = op->map;

      mflags = get_map_flags (m, &m, x, y, &x, &y);
      if (mflags & P_OUT_OF_MAP)
        continue;

      /* Check everything in the square for trapness */
      for (tmp = GET_MAP_OB (m, x, y); tmp != NULL; tmp = tmp->above)
        {
          /* And now we'd better do an inventory traversal of each
           * of these objects inventory.  Like above, only
           * do this for interesting objects.
           */

          if (tmp->type != PLAYER && !QUERY_FLAG (tmp, FLAG_MONSTER))
            {
              for (tmp2 = tmp->inv; tmp2 != NULL; tmp2 = tmp2->below)
                if ((tmp2->type == RUNE || tmp2->type == TRAP) && tmp2->stats.Cha <= 1)
                  {
                    trap_show (tmp2, tmp);
                    if (trap_disarm (op, tmp2, 1, skill) && (!tmp2->owner || tmp2->owner->type != PLAYER))
                      {
                        tmp->stats.exp = tmp->stats.Cha * tmp->level;
                        success += calc_skill_exp (op, tmp2, skill);
                      }
                  }
            }
          if ((tmp->type == RUNE || tmp->type == TRAP) && tmp->stats.Cha <= 1)
            {
              trap_show (tmp, tmp);
              if (trap_disarm (op, tmp, 1, skill) && (!tmp->owner || tmp->owner->type != PLAYER))
                {
                  tmp->stats.exp = tmp->stats.Cha * tmp->level;
                  success += calc_skill_exp (op, tmp, skill);
                }
            }
        }
    }
  return success;
}


/* pray() - when this skill is called from do_skill(), it allows
 * the player to regain lost grace points at a faster rate. -b.t.
 * This always returns 0 - return value is used by calling function
 * such that if it returns true, player gets exp in that skill.  This
 * the effect here can be done on demand, we probably don't want to
 * give infinite exp by returning true in any cases.
 */

int
pray (object *pl, object *skill)
{
  char buf[MAX_BUF];
  object *tmp;

  if (pl->type != PLAYER)
    return 0;

  strcpy (buf, "You pray.");

  /* Check all objects - we could stop at floor objects,
   * but if someone buries an altar, I don't see a problem with
   * going through all the objects, and it shouldn't be much slower
   * than extra checks on object attributes.
   */
  for (tmp = pl->below; tmp != NULL; tmp = tmp->below)
    {
      /* Only if the altar actually belongs to someone do you get special benefits */
      if (tmp && tmp->type == HOLY_ALTAR && tmp->other_arch)
        {
          sprintf (buf, "You pray over the %s.", &tmp->name);
          pray_at_altar (pl, tmp, skill);
          break;                /* Only pray at one altar */
        }
    }

  new_draw_info (NDI_BLACK, 0, pl, buf);

  if (pl->stats.grace < pl->stats.maxgrace)
    {
      pl->stats.grace++;
      pl->last_grace = -1;
    }
  return 0;
}

/* This skill allows the player to regain a few sp or hp for a 
 * brief period of concentration. No armour or weapons may be 
 * wielded/applied for this to work. The amount of time needed
 * to concentrate and the # of points regained is dependant on
 * the level of the user. - b.t. thomas@astro.psu.edu 
 */

void
meditate (object *pl, object *skill)
{
  object *tmp;

  if (pl->type != PLAYER)
    return;                     /* players only */

  /* check if pl has removed encumbering armour and weapons */
  if (QUERY_FLAG (pl, FLAG_READY_WEAPON) && (skill->level < 6))
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You can't concentrate while wielding a weapon!\n");
      return;
    }
  else
    {
      for (tmp = pl->inv; tmp; tmp = tmp->below)
        if (((tmp->type == ARMOUR    && skill->level < 12)
             || (tmp->type == HELMET && skill->level < 10)
             || (tmp->type == SHIELD && skill->level <  6)
             || (tmp->type == BOOTS  && skill->level <  4)
             || (tmp->type == GLOVES && skill->level <  2))
            && QUERY_FLAG (tmp, FLAG_APPLIED))
          {
            new_draw_info (NDI_UNIQUE, 0, pl, "You can't concentrate while wearing so much armour!\n");
            return;
          }
    }

  /* ok let's meditate!  Spell points are regained first, then once
   * they are maxed we get back hp. Actual incrementing of values
   * is handled by the do_some_living() (in player.c). This way magical
   * bonuses for healing/sp regeneration are included properly
   * No matter what, we will eat up some playing time trying to 
   * meditate. (see 'factor' variable for what sets the amount of time) 
   */

  new_draw_info (NDI_BLACK, 0, pl, "You meditate.");

  if (pl->stats.sp < pl->stats.maxsp)
    {
      pl->stats.sp++;
      pl->last_sp = -1;
    }
  else if (pl->stats.hp < pl->stats.maxhp)
    {
      pl->stats.hp++;
      pl->last_heal = -1;
    }
}

/* write_note() - this routine allows players to inscribe messages in 
 * ordinary 'books' (anything that is type BOOK). b.t.
 */
static int
write_note (object *pl, object *item, const char *msg, object *skill)
{
  char buf[1024];
  object *newBook = NULL;

  /* a pair of sanity checks */
  if (!item || item->type != BOOK)
    return 0;

  if (!msg)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "No message to write!");
      new_draw_info_format (NDI_UNIQUE, 0, pl, "Usage: use_skill %s <message>", &skill->skill);
      return 0;
    }

  if (strcasestr_local (msg, "endmsg"))
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "Trying to cheat now are we?");
      return 0;
    }

  if (INVOKE_OBJECT (INSCRIBE_NOTE, item, ARG_PLAYER (pl->contr), ARG_STRING (msg), ARG_OBJECT (skill)))
    return strlen (msg);

  buf[0] = 0;
  if (!book_overflow (item->msg, msg, sizeof (buf)))
    {                           /* add msg string to book */
      if (item->msg)
        strcpy (buf, item->msg);

      strcat (buf, msg);
      strcat (buf, "\n");       /* new msg needs a LF */
      if (item->nrof > 1)
        {
          newBook = item->clone ();
          decrease_ob (item);
          esrv_send_item (pl, item);
          newBook->nrof = 1;
          newBook->msg = buf;
          newBook = insert_ob_in_ob (newBook, pl);
          esrv_send_item (pl, newBook);
        }
      else
        {
          item->msg = buf;
          /* This shouldn't be necessary - the object hasn't changed in any
           * visible way
           */
          /*      esrv_send_item(pl, item); */
        }

      new_draw_info_format (NDI_UNIQUE, 0, pl, "You write in the %s.", query_short_name (item));
      return strlen (msg);
    }
  else
    new_draw_info_format (NDI_UNIQUE, 0, pl, "Your message won't fit in the %s!", query_short_name (item));

  return 0;
}

/* write_scroll() - this routine allows players to inscribe spell scrolls
 * of spells which they know. Backfire effects are possible with the
 * severity of the backlash correlated with the difficulty of the scroll 
 * that is attempted. -b.t. thomas@astro.psu.edu
 */

static int
write_scroll (object *pl, object *scroll, object *skill)
{
  int success = 0, confused = 0;
  object *newscroll, *chosen_spell, *tmp;

  /* this is a sanity check */
  if (scroll->type != SCROLL)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "A spell can only be inscribed into a scroll!");
      return 0;
    }

  /* Check if we are ready to attempt inscription */
  chosen_spell = pl->contr->ranged_ob;
  if (!chosen_spell || chosen_spell->type != SPELL)
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You need a spell readied in order to inscribe!");
      return 0;
    }

  if (SP_level_spellpoint_cost (pl, chosen_spell, SPELL_GRACE) > pl->stats.grace)
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl, "You don't have enough grace to write a scroll of %s.", &chosen_spell->name);
      return 0;
    }

  if (SP_level_spellpoint_cost (pl, chosen_spell, SPELL_MANA) > pl->stats.sp)
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl, "You don't have enough mana to write a scroll of %s.", &chosen_spell->name);
      return 0;
    }

  /* if there is a spell already on the scroll then player could easily
   * accidently read it while trying to write the new one.  give player
   * a 50% chance to overwrite spell at their own level
   */
  if ((scroll->stats.sp || scroll->inv) && random_roll (0, scroll->level * 2, pl, PREFER_LOW) > skill->level)
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl, "Oops! You accidently read it while trying to write on it.");
      manual_apply (pl, scroll, 0);
      return 0;
    }

  /* ok, we are ready to try inscription */
  if (QUERY_FLAG (pl, FLAG_CONFUSED))
    confused = 1;

  /* Lost mana/grace no matter what */
  pl->stats.grace -= SP_level_spellpoint_cost (pl, chosen_spell, SPELL_GRACE);
  pl->stats.sp -= SP_level_spellpoint_cost (pl, chosen_spell, SPELL_MANA);

  if (random_roll (0, chosen_spell->level * 4 - 1, pl, PREFER_LOW) < skill->level)
    {
      if (scroll->nrof > 1)
        {
          newscroll = scroll->clone ();
          decrease_ob (scroll);
          newscroll->nrof = 1;
        }
      else
        newscroll = scroll;

      if (!confused)
        {
          newscroll->level = MAX (skill->level, chosen_spell->level);
          new_draw_info (NDI_UNIQUE, 0, pl, "You succeed in writing a new scroll.");
        }
      else
        {
          chosen_spell = find_random_spell_in_ob (pl, NULL);
          if (!chosen_spell)
            return 0;

          newscroll->level = MAX (skill->level, chosen_spell->level);
          new_draw_info (NDI_UNIQUE, 0, pl, "In your confused state, you write down some odd spell.");
        }

      if (newscroll->inv)
        newscroll->inv->destroy ();

      tmp = chosen_spell->clone ();
      insert_ob_in_ob (tmp, newscroll);

      /* Same code as from treasure.c - so they can better merge.
       * if players want to sell them, so be it.
       */
      newscroll->value = newscroll->arch->value * newscroll->inv->value * (newscroll->level + 50) / (newscroll->inv->level + 50);
      newscroll->stats.exp = newscroll->value / 5;

      /* wait until finished manipulating the scroll before inserting it */
      if (newscroll == scroll)
        {
          /* Remove to correctly merge with other items which may exist in inventory */
          newscroll->remove ();
          esrv_del_item (pl->contr, newscroll->count);
        }

      newscroll = insert_ob_in_ob (newscroll, pl);
      esrv_send_item (pl, newscroll);
      success = calc_skill_exp (pl, newscroll, skill);
      if (!confused)
        success *= 2;
      success = success * skill->level;
      return success;

    }
  else
    {                           /* Inscription has failed */

      if (chosen_spell->level > skill->level || confused)
        {                       /*backfire! */
          new_draw_info (NDI_UNIQUE, 0, pl, "Ouch! Your attempt to write a new scroll strains your mind!");
          if (random_roll (0, 1, pl, PREFER_LOW) == 1)
            pl->drain_specific_stat (4);
          else
            {
              confuse_player (pl, pl, 99);
              return (-30 * chosen_spell->level);
            }
        }
      else if (random_roll (0, pl->stats.Int - 1, pl, PREFER_HIGH) < 15)
        {
          new_draw_info (NDI_UNIQUE, 0, pl, "Your attempt to write a new scroll rattles your mind!");
          confuse_player (pl, pl, 99);
        }
      else
        new_draw_info (NDI_UNIQUE, 0, pl, "You fail to write a new scroll.");
    }

  return 0;
}

/* write_on_item() - wrapper for write_note and write_scroll */
int
write_on_item (object *pl, const char *params, object *skill)
{
  object *item;
  const char *string = params;
  int msgtype;
  archetype *skat;

  if (pl->type != PLAYER)
    return 0;

  if (!params)
    {
      params = "";
      string = params;
    }

  skat = get_archetype_by_type_subtype (SKILL, SK_LITERACY);

  /* Need to be able to read before we can write! */
  if (!find_skill_by_name (pl, skat->skill))
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You must learn to read before you can write!");
      return 0;
    }

  /* if there is a message then it goes in a book and no message means
   * write active spell into the scroll
   */
  msgtype = (string[0] != '\0') ? BOOK : SCROLL;

  /* find an item of correct type to write on */
  if (!(item = find_marked_object (pl)))
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You don't have any marked item to write on.");
      return 0;
    }

  if (QUERY_FLAG (item, FLAG_UNPAID))
    {
      new_draw_info (NDI_UNIQUE, 0, pl, "You had better pay for that before you write on it.");
      return 0;
    }
  if (msgtype != item->type)
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl, "You have no %s to write on", msgtype == BOOK ? "book" : "scroll");
      return 0;
    }

  if (msgtype == SCROLL)
    return write_scroll (pl, item, skill);
  else if (msgtype == BOOK)
    return write_note (pl, item, string, skill);

  return 0;
}

/* find_throw_ob() - if we request an object, then
 * we search for it in the inventory of the owner (you've
 * got to be carrying something in order to throw it!).
 * If we didnt request an object, then the top object in inventory
 * (that is "throwable", ie no throwing your skills away!)
 * is the object of choice. Also check to see if object is
 * 'throwable' (ie not applied cursed obj, worn, etc).
 */
static object *
find_throw_ob (object *op, const char *request)
{
  object *tmp;

  if (!op)
    {                           /* safety */
      LOG (llevError, "find_throw_ob(): confused! have a NULL thrower!\n");
      return (object *) NULL;
    }

  /* prefer marked item */
  tmp = find_marked_object (op);
  if (tmp != NULL)
    {
      /* can't toss invisible or inv-locked items */
      if (tmp->invisible || QUERY_FLAG (tmp, FLAG_INV_LOCKED))
        {
          tmp = NULL;
        }
    }

  /* look through the inventory */
  if (tmp == NULL)
    {
      for (tmp = op->inv; tmp != NULL; tmp = tmp->below)
        {
          /* can't toss invisible or inv-locked items */
          if (tmp->invisible || QUERY_FLAG (tmp, FLAG_INV_LOCKED))
            continue;
          if (!request || !strcmp (query_name (tmp), request) || !strcmp (tmp->name, request))
            break;
        }
    }

  /* this should prevent us from throwing away
   * cursed items, worn armour, etc. Only weapons
   * can be thrown from 'hand'.  
   */
  if (!tmp)
    return NULL;

  if (QUERY_FLAG (tmp, FLAG_APPLIED))
    {
      if (tmp->type != WEAPON)
        {
          new_draw_info_format (NDI_UNIQUE, 0, op, "You can't throw %s.", query_name (tmp));
          tmp = NULL;
        }
      else if (QUERY_FLAG (tmp, FLAG_CURSED) || QUERY_FLAG (tmp, FLAG_DAMNED))
        {
          new_draw_info_format (NDI_UNIQUE, 0, op, "The %s sticks to your hand!", query_name (tmp));
          tmp = NULL;
        }
      else
        {
          if (apply_special (op, tmp, AP_UNAPPLY | AP_NO_MERGE))
            {
              LOG (llevError, "BUG: find_throw_ob(): couldn't unapply\n");
              tmp = NULL;
            }
        }
    }
  else if (QUERY_FLAG (tmp, FLAG_UNPAID))
    {
      new_draw_info_format (NDI_UNIQUE, 0, op, "You should pay for the %s first.", query_name (tmp));
      tmp = NULL;
    }

  if (tmp && QUERY_FLAG (tmp, FLAG_INV_LOCKED))
    {
      LOG (llevError, "BUG: find_throw_ob(): object is locked\n");
      tmp = NULL;
    }
  return tmp;
}

/* make_throw_ob() We construct the 'carrier' object in
 * which we will insert the object that is being thrown.
 * This combination  becomes the 'thrown object'. -b.t.
 */
static object *
make_throw_ob (object *orig)
{
  if (!orig)
    return NULL;

  if (QUERY_FLAG (orig, FLAG_APPLIED))
    {
      LOG (llevError, "BUG: make_throw_ob(): ob is applied\n");
      /* insufficient workaround, but better than nothing */
      CLEAR_FLAG (orig, FLAG_APPLIED);
    }

  object *toss_item = orig->clone ();

  toss_item->type = THROWN_OBJ;
  CLEAR_FLAG (toss_item, FLAG_CHANGING);
  toss_item->stats.dam = 0;     /* default damage */
  insert_ob_in_ob (orig, toss_item);
  return toss_item;
}

/* do_throw() - op throws any object toss_item. This code
 * was borrowed from fire_bow.
 * Returns 1 if skill was successfully used, 0 if not
 */
static int
do_throw (object *op, object *part, object *toss_item, int dir, object *skill)
{
  object *throw_ob = toss_item, *left = NULL;
  int eff_str = 0, maxc, str = op->stats.Str, dam = 0;
  int pause_f, weight_f = 0, mflags;
  float str_factor = 1.0, load_factor = 1.0, item_factor = 1.0;
  maptile *m;
  sint16 sx, sy;

  if (throw_ob == NULL)
    {
      if (op->type == PLAYER)
        new_draw_info (NDI_UNIQUE, 0, op, "You have nothing to throw.");

      return 0;
    }
  if (QUERY_FLAG (throw_ob, FLAG_STARTEQUIP))
    {
      if (op->type == PLAYER)
        new_draw_info (NDI_UNIQUE, 0, op, "The gods won't let you throw that.");

      return 0;
    }

  /* Because throwing effectiveness must be reduced by the
   * encumbrance of the thrower and weight of the object. THus,
   * we use the concept of 'effective strength' as defined below. 
   */

  /* if str exceeds MAX_STAT (30, eg giants), lets assign a str_factor > 1 */
  if (str > MAX_STAT)
    {
      str_factor = (float) str / (float) MAX_STAT;
      str = MAX_STAT;
    }

  /* the more we carry, the less we can throw. Limit only on players */
  maxc = max_carry[str] * 1000;
  if (op->carrying > maxc && op->type == PLAYER)
    load_factor = (float) maxc / (float) op->carrying;

  /* lighter items are thrown harder, farther, faster */
  if (throw_ob->weight > 0)
    item_factor = (float) maxc / (float) (3.0 * throw_ob->weight);
  else
    {                           /* 0 or negative weight?!? Odd object, can't throw it */
      new_draw_info_format (NDI_UNIQUE, 0, op, "You can't throw %s.\n", query_name (throw_ob));
      return 0;
    }

  eff_str = (int) (str * (load_factor < 1.0 ? load_factor : 1.0));
  eff_str = (int) ((float) eff_str * item_factor * str_factor);

  /* alas, arrays limit us to a value of MAX_STAT (30). Use str_factor to
   * account for super-strong throwers. */
  if (eff_str > MAX_STAT)
    eff_str = MAX_STAT;

#ifdef DEBUG_THROW
  LOG (llevDebug, "%s carries %d, eff_str=%d\n", op->name, op->carrying, eff_str);
  LOG (llevDebug, " max_c=%d, item_f=%f, load_f=%f, str=%d\n", maxc, item_factor, load_factor, op->stats.Str);
  LOG (llevDebug, " str_factor=%f\n", str_factor);
  LOG (llevDebug, " item %s weight= %d\n", throw_ob->name, throw_ob->weight);
#endif

  /* 3 things here prevent a throw, you aimed at your feet, you
   * have no effective throwing strength, or you threw at something
   * that flying objects can't get through.
   */
  mflags = get_map_flags (part->map, &m, part->x + freearr_x[dir], part->y + freearr_y[dir], &sx, &sy);

  if (!dir || (eff_str <= 1) || (mflags & P_OUT_OF_MAP) || (GET_MAP_MOVE_BLOCK (m, sx, sy) & MOVE_FLY_LOW))
    {
      /* bounces off 'wall', and drops to feet */
      throw_ob->insert_at (part, op);

      if (op->type == PLAYER)
        {
          if (eff_str <= 1)
            new_draw_info_format (NDI_UNIQUE, 0, op, "Your load is so heavy you drop %s to the ground.", query_name (throw_ob));
          else if (!dir)
            new_draw_info_format (NDI_UNIQUE, 0, op, "You throw %s at the ground.", query_name (throw_ob));
          else
            new_draw_info (NDI_UNIQUE, 0, op, "Something is in the way.");
        }

      return 0;
    }                           /* if object can't be thrown */

  left = throw_ob;              /* these are throwing objects left to the player */

  /* sometimes get_split_ob can't split an object (because op->nrof==0?)
   * and returns NULL. We must use 'left' then 
   */

  if ((throw_ob = get_split_ob (throw_ob, 1)) == NULL)
    {
      throw_ob = left;
      left->remove ();
      if (op->type == PLAYER)
        esrv_del_item (op->contr, left->count);
    }
  else if (op->type == PLAYER)
    {
      if (left->destroyed ())
        esrv_del_item (op->contr, left->count);
      else
        esrv_update_item (UPD_NROF, op, left);
    }

  /* special case: throwing powdery substances like dust, dirt */
  if (throw_ob->type == POTION && throw_ob->subtype == POT_DUST)
    {
      cast_dust (op, throw_ob, dir);
      return 1;
    }

  /* Make a thrown object -- insert real object in a 'carrier' object.
   * If unsuccessfull at making the "thrown_obj", we just reinsert
   * the original object back into inventory and exit
   */
  if ((toss_item = make_throw_ob (throw_ob)))
    {
      throw_ob = toss_item;
      throw_ob->skill = skill->skill;
    }
  else
    {
      insert_ob_in_ob (throw_ob, op);
      return 0;
    }

  throw_ob->set_owner (op);
  /* At some point in the attack code, the actual real object (op->inv)
   * becomes the hitter.  As such, we need to make sure that has a proper
   * owner value so exp goes to the right place.
   */
  throw_ob->inv->set_owner (op);
  throw_ob->direction = dir;

  /* the damage bonus from the force of the throw */
  dam = (int) (str_factor * dam_bonus[eff_str]);

  /* Now, lets adjust the properties of the thrown_ob. */

  /* how far to fly */
  throw_ob->last_sp = (eff_str * 3) / 5;

  /* speed */
  throw_ob->set_speed (min (1.0, speed_bonus[eff_str] + 1.0) / 1.5); /* no faster than an arrow! */

  /* item damage. Eff_str and item weight influence damage done */
  weight_f = (throw_ob->weight / 2000) > MAX_STAT ? MAX_STAT : (throw_ob->weight / 2000);
  throw_ob->stats.dam += (dam / 3) + dam_bonus[weight_f] + (throw_ob->weight / 15000) - 2;

  /* chance of breaking. Proportional to force used and weight of item */
  throw_ob->stats.food = (dam / 2) + (throw_ob->weight / 60000);

  /* replace 25 with a call to clone.arch wc? messes up w/ NPC */
  throw_ob->stats.wc = 25 - dex_bonus[op->stats.Dex] - thaco_bonus[eff_str] - skill->level;

  /* the properties of objects which are meant to be thrown (ie dart,
   * throwing knife, etc) will differ from ordinary items. Lets tailor
   * this stuff in here. 
   */

  if (QUERY_FLAG (throw_ob->inv, FLAG_IS_THROWN))
    {
      throw_ob->last_sp += eff_str / 3; /* fly a little further */
      throw_ob->stats.dam += throw_ob->inv->stats.dam + throw_ob->magic + 2;
      throw_ob->stats.wc -= throw_ob->magic + throw_ob->inv->stats.wc;
      /* only throw objects get directional faces */
      if (GET_ANIM_ID (throw_ob) && NUM_ANIMATIONS (throw_ob))
        SET_ANIMATION (throw_ob, dir);
    }
  else
    {
      uint16 mat = throw_ob->materials;

      /* some materials will adjust properties.. */
      if (mat & M_LEATHER)
        {
          throw_ob->stats.dam -= 1;
          throw_ob->stats.food -= 10;
        }

      if (mat & M_GLASS)
        throw_ob->stats.food += 60;

      if (mat & M_ORGANIC)
        {
          throw_ob->stats.dam -= 3;
          throw_ob->stats.food += 55;
        }

      if (mat & M_PAPER || mat & M_CLOTH)
        {
          throw_ob->stats.dam -= 5;
          throw_ob->speed *= 0.8;
          throw_ob->stats.wc += 3;
          throw_ob->stats.food -= 30;
        }

      /* light obj have more wind resistance, fly slower */
      if (throw_ob->weight > 500)
        throw_ob->speed *= 0.8;

      if (throw_ob->weight > 50)
        throw_ob->speed *= 0.5;
    }                           /* else tailor thrown object */

  /* some limits, and safeties (needed?) */
  if (throw_ob->stats.dam < 0)
    throw_ob->stats.dam = 0;
  if (throw_ob->last_sp > eff_str)
    throw_ob->last_sp = eff_str;
  if (throw_ob->stats.food < 0)
    throw_ob->stats.food = 0;
  if (throw_ob->stats.food > 100)
    throw_ob->stats.food = 100;
  if (throw_ob->stats.wc > 30)
    throw_ob->stats.wc = 30;

  /* how long to pause the thrower. Higher values mean less pause */
  pause_f = ((2 * eff_str) / 3) + 20 + skill->level;

  /* Put a lower limit on this */
  if (pause_f < 10)
    pause_f = 10;
  if (pause_f > 100)
    pause_f = 100;

  /* Changed in 0.94.2 - the calculation before was really goofy.
   * In short summary, a throw can take anywhere between speed 5 and
   * speed 0.5
   */
  op->speed_left -= 50 / pause_f;

  throw_ob->speed_left = 0;
  throw_ob->map = part->map;

  throw_ob->move_type = MOVE_FLY_LOW;
  throw_ob->move_on = MOVE_FLY_LOW | MOVE_WALK;

#if 0
  /* need to put in a good sound for this */
  play_sound_map (op->map, op->x, op->y, SOUND_THROW_OBJ);
#endif

/* Lauwenmark - Now we can call the associated script_throw event (if any) */
  INVOKE_OBJECT (THROW, throw_ob, ARG_OBJECT (op));
#ifdef DEBUG_THROW
  LOG (llevDebug, " pause_f=%d \n", pause_f);
  LOG (llevDebug, " %s stats: wc=%d dam=%d dist=%d spd=%f break=%d\n",
       throw_ob->name, throw_ob->stats.wc, throw_ob->stats.dam, throw_ob->last_sp, throw_ob->speed, throw_ob->stats.food);
  LOG (llevDebug, "inserting tossitem (%d) into map\n", throw_ob->count);
#endif

  throw_ob->insert_at (part, op);

  if (!throw_ob->destroyed ())
    move_arrow (throw_ob);

  return 1;
}

int
skill_throw (object *op, object *part, int dir, const char *params, object *skill)
{
  object *throw_ob;

  if (op->type == PLAYER)
    throw_ob = find_throw_ob (op, params);
  else
    throw_ob = find_mon_throw_ob (op);

  return do_throw (op, part, throw_ob, dir, skill);
}
Revision:	1.38
Committed:	Sun Jul 1 05:00:20 2007 UTC (16 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.37:	+10 -11 lines
Log Message:	- upgrade crossfire trt to the GPL version 3 (hopefully correctly). - add a single file covered by the GNU Affero General Public License (which is not yet released, so I used the current draft, which is legally a bit wavy, but its likely better than nothing as it expresses direct intent by the authors, and we can upgrade as soon as it has been released). * this should ensure availability of source code for the server at least and hopefully also archetypes and maps even when modified versions are not being distributed, in accordance of section 13 of the agplv3.