[hengband/hengband.git] / src / monster-process.c

/*!
 * @file monster-process.c
 * @brief モンスターの特殊技能とターン経過処理 (移動等)/ Monster spells and movement for passaging a turn
 * @date 2014/01/17
 * @author
 * Copyright (c) 1997 Ben Harrison, James E. Wilson, Robert A. Koeneke\n
 * This software may be copied and distributed for educational, research,\n
 * and not for profit purposes provided that this copyright and statement\n
 * are included in all such copies.  Other copyrights may also apply.\n
 * 2014 Deskull rearranged comment for Doxygen.\n
 * @details
 * This file has several additions to it by Keldon Jones (keldon@umr.edu)
 * to improve the general quality of the AI (version 0.1.1).
 */

#include "angband.h"
#include "util.h"

#include "cmd-dump.h"
#include "cmd-pet.h"
#include "creature.h"
#include "melee.h"
#include "spells.h"
#include "spells-floor.h"
#include "spells-summon.h"
#include "quest.h"
#include "avatar.h"
#include "realm-hex.h"
#include "object-flavor.h"
#include "object-hook.h"
#include "feature.h"
#include "grid.h"
#include "player-move.h"
#include "monster-status.h"
#include "monster-spell.h"
#include "monster-process.h"
#include "monsterrace-hook.h"
#include "dungeon.h"
#include "floor.h"
#include "files.h"
#include "view-mainwindow.h"

typedef struct {
        bool is_riding_mon;
        bool do_turn;
        bool do_move;
        bool do_view;
        bool do_take;
        bool must_alter_to_move;

        bool did_open_door;
        bool did_bash_door;
        bool did_take_item;
        bool did_kill_item;
        bool did_move_body;
        bool did_pass_wall;
        bool did_kill_wall;
} turn_flags;

void decide_drop_from_monster(player_type *target_ptr, MONSTER_IDX m_idx, bool is_riding_mon);
bool vanish_summoned_children(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m);
void awake_monster(player_type *target_ptr, MONSTER_IDX m_idx);
void process_angar(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m);
bool process_quantum_effect(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m);
void vanish_nonunique(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m);
void produce_quantum_effect(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m);
bool decide_monster_multiplication(player_type *target_ptr, MONSTER_IDX m_idx, POSITION oy, POSITION ox);
bool decide_monster_movement_direction(player_type *target_ptr, DIRECTION *mm, MONSTER_IDX m_idx, bool aware);
bool runaway_monster(player_type *target_ptr, MONSTER_IDX m_idx, bool is_riding_mon, bool see_m);
void process_special(player_type *target_ptr, MONSTER_IDX m_idx);
void process_speak_sound(player_type *target_ptr, MONSTER_IDX m_idx, POSITION oy, POSITION ox, bool aware);
bool cast_spell(player_type *target_ptr, MONSTER_IDX m_idx, bool aware);

bool process_wall(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx, bool can_cross);
bool process_door(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx);
bool bash_normal_door(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx);
void bash_glass_door(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, feature_type *f_ptr, bool may_bash);
bool process_protection_rune(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx);
bool process_explosive_rune(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx);

void exe_monster_attack_to_player(player_type *target_ptr, turn_flags *turn_flags_ptr, MONSTER_IDX m_idx, POSITION ny, POSITION nx);
bool process_monster_attack_to_monster(player_type *target_ptr, turn_flags *turn_flags_ptr, MONSTER_IDX m_idx, grid_type *g_ptr, bool can_cross);
bool exe_monster_attack_to_monster(player_type *target_ptr, MONSTER_IDX m_idx, grid_type *g_ptr);

 /*!
  * @brief モンスターが敵に接近するための方向を決める /
  * Calculate the direction to the next enemy
  * @param target_ptr プレーヤーへの参照ポインタ
  * @param m_idx モンスターの参照ID
  * @param mm 移動するべき方角IDを返す参照ポインタ
  * @return 方向が確定した場合TRUE、接近する敵がそもそもいない場合FALSEを返す
  */
static bool get_enemy_dir(player_type *target_ptr, MONSTER_IDX m_idx, int *mm)
{
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        monster_type *m_ptr = &floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];

        POSITION x = 0, y = 0;
        if (target_ptr->riding_t_m_idx && player_bold(target_ptr, m_ptr->fy, m_ptr->fx))
        {
                y = floor_ptr->m_list[target_ptr->riding_t_m_idx].fy;
                x = floor_ptr->m_list[target_ptr->riding_t_m_idx].fx;
        }
        else if (is_pet(m_ptr) && target_ptr->pet_t_m_idx)
        {
                y = floor_ptr->m_list[target_ptr->pet_t_m_idx].fy;
                x = floor_ptr->m_list[target_ptr->pet_t_m_idx].fx;
        }
        else
        {
                int start;
                int plus = 1;
                if (target_ptr->phase_out)
                {
                        start = randint1(floor_ptr->m_max - 1) + floor_ptr->m_max;
                        if (randint0(2)) plus = -1;
                }
                else
                {
                        start = floor_ptr->m_max + 1;
                }

                for (int i = start; ((i < start + floor_ptr->m_max) && (i > start - floor_ptr->m_max)); i += plus)
                {
                        MONSTER_IDX dummy = (i % floor_ptr->m_max);
                        if (!dummy) continue;

                        MONSTER_IDX t_idx = dummy;
                        monster_type *t_ptr;
                        t_ptr = &floor_ptr->m_list[t_idx];

                        if (t_ptr == m_ptr) continue;
                        if (!monster_is_valid(t_ptr)) continue;

                        if (is_pet(m_ptr))
                        {
                                if (target_ptr->pet_follow_distance < 0)
                                {
                                        if (t_ptr->cdis <= (0 - target_ptr->pet_follow_distance))
                                        {
                                                continue;
                                        }
                                }
                                else if ((m_ptr->cdis < t_ptr->cdis) && (t_ptr->cdis > target_ptr->pet_follow_distance))
                                {
                                        continue;
                                }

                                if (r_ptr->aaf < t_ptr->cdis) continue;
                        }

                        if (!are_enemies(target_ptr, m_ptr, t_ptr)) continue;

                        if (((r_ptr->flags2 & RF2_PASS_WALL) && ((m_idx != target_ptr->riding) || target_ptr->pass_wall)) ||
                                ((r_ptr->flags2 & RF2_KILL_WALL) && (m_idx != target_ptr->riding)))
                        {
                                if (!in_disintegration_range(floor_ptr, m_ptr->fy, m_ptr->fx, t_ptr->fy, t_ptr->fx)) continue;
                        }
                        else
                        {
                                if (!projectable(target_ptr, m_ptr->fy, m_ptr->fx, t_ptr->fy, t_ptr->fx)) continue;
                        }

                        y = t_ptr->fy;
                        x = t_ptr->fx;

                        break;
                }

                if (!x && !y) return FALSE;
        }

        x -= m_ptr->fx;
        y -= m_ptr->fy;

        /* North, South, East, West, North-West, North-East, South-West, South-East */
        if ((y < 0) && (x == 0))
        {
                mm[0] = 8;
                mm[1] = 7;
                mm[2] = 9;
        }
        else if ((y > 0) && (x == 0))
        {
                mm[0] = 2;
                mm[1] = 1;
                mm[2] = 3;
        }
        else if ((x > 0) && (y == 0))
        {
                mm[0] = 6;
                mm[1] = 9;
                mm[2] = 3;
        }
        else if ((x < 0) && (y == 0))
        {
                mm[0] = 4;
                mm[1] = 7;
                mm[2] = 1;
        }
        else if ((y < 0) && (x < 0))
        {
                mm[0] = 7;
                mm[1] = 4;
                mm[2] = 8;
        }
        else if ((y < 0) && (x > 0))
        {
                mm[0] = 9;
                mm[1] = 6;
                mm[2] = 8;
        }
        else if ((y > 0) && (x < 0))
        {
                mm[0] = 1;
                mm[1] = 4;
                mm[2] = 2;
        }
        else if ((y > 0) && (x > 0))
        {
                mm[0] = 3;
                mm[1] = 6;
                mm[2] = 2;
        }

        return TRUE;
}


/*!
 * @brief モンスターがプレイヤーから逃走するかどうかを返す /
 * Returns whether a given monster will try to run from the player.
 * @param m_idx 逃走するモンスターの参照ID
 * @return モンスターがプレイヤーから逃走するならばTRUEを返す。
 * @details
 * Monsters will attempt to avoid very powerful players.  See below.\n
 *\n
 * Because this function is called so often, little details are important\n
 * for efficiency.  Like not using "mod" or "div" when possible.  And\n
 * attempting to check the conditions in an optimal order.  Note that\n
 * "(x << 2) == (x * 4)" if "x" has enough bits to hold the result.\n
 *\n
 * Note that this function is responsible for about one to five percent\n
 * of the processor use in normal conditions...\n
 */
static bool mon_will_run(player_type *target_ptr, MONSTER_IDX m_idx)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];

        if (is_pet(m_ptr))
        {
                return ((target_ptr->pet_follow_distance < 0) &&
                        (m_ptr->cdis <= (0 - target_ptr->pet_follow_distance)));
        }

        if (m_ptr->cdis > MAX_SIGHT + 5) return FALSE;
        if (MON_MONFEAR(m_ptr)) return TRUE;
        if (m_ptr->cdis <= 5) return FALSE;

        PLAYER_LEVEL p_lev = target_ptr->lev;
        DEPTH m_lev = r_ptr->level + (m_idx & 0x08) + 25;
        if (m_lev > p_lev + 4) return FALSE;
        if (m_lev + 4 <= p_lev) return TRUE;

        HIT_POINT p_chp = target_ptr->chp;
        HIT_POINT p_mhp = target_ptr->mhp;
        HIT_POINT m_chp = m_ptr->hp;
        HIT_POINT m_mhp = m_ptr->maxhp;
        u32b p_val = (p_lev * p_mhp) + (p_chp << 2);
        u32b m_val = (m_lev * m_mhp) + (m_chp << 2);
        if (p_val * m_mhp > m_val * p_mhp) return TRUE;

        return FALSE;
}


/*!
 * @brief モンスターがプレイヤーに向けて遠距離攻撃を行うことが可能なマスを走査する /
 * Search spell castable grid
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターの参照ID
 * @param yp 適したマスのY座標を返す参照ポインタ
 * @param xp 適したマスのX座標を返す参照ポインタ
 * @return 有効なマスがあった場合TRUEを返す
 */
static bool get_moves_aux2(player_type *target_ptr, MONSTER_IDX m_idx, POSITION *yp, POSITION *xp)
{
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        monster_type *m_ptr = &floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];

        POSITION y1 = m_ptr->fy;
        POSITION x1 = m_ptr->fx;

        if (projectable(target_ptr, y1, x1, target_ptr->y, target_ptr->x)) return FALSE;

        int now_cost = floor_ptr->grid_array[y1][x1].cost;
        if (now_cost == 0) now_cost = 999;

        bool can_open_door = FALSE;
        if (r_ptr->flags2 & (RF2_BASH_DOOR | RF2_OPEN_DOOR))
        {
                can_open_door = TRUE;
        }

        int best = 999;
        for (int i = 7; i >= 0; i--)
        {
                POSITION y = y1 + ddy_ddd[i];
                POSITION x = x1 + ddx_ddd[i];
                if (!in_bounds2(floor_ptr, y, x)) continue;
                if (player_bold(target_ptr, y, x)) return FALSE;

                grid_type *g_ptr;
                g_ptr = &floor_ptr->grid_array[y][x];
                int cost = g_ptr->cost;
                if (!(((r_ptr->flags2 & RF2_PASS_WALL) && ((m_idx != target_ptr->riding) || target_ptr->pass_wall)) || ((r_ptr->flags2 & RF2_KILL_WALL) && (m_idx != target_ptr->riding))))
                {
                        if (cost == 0) continue;
                        if (!can_open_door && is_closed_door(target_ptr, g_ptr->feat)) continue;
                }

                if (cost == 0) cost = 998;

                if (now_cost < cost) continue;
                if (!projectable(target_ptr, y, x, target_ptr->y, target_ptr->x)) continue;
                if (best < cost) continue;

                best = cost;
                *yp = y1 + ddy_ddd[i];
                *xp = x1 + ddx_ddd[i];
        }

        if (best == 999) return FALSE;

        return TRUE;
}


/*!
 * @brief モンスターがプレイヤーに向けて接近することが可能なマスを走査する /
 * Choose the "best" direction for "flowing"
 * @param m_idx モンスターの参照ID
 * @param yp 移動先のマスのY座標を返す参照ポインタ
 * @param xp 移動先のマスのX座標を返す参照ポインタ
 * @param no_flow モンスターにFLOWフラグが経っていない状態でTRUE
 * @return 有効なマスがあった場合TRUEを返す
 * @details
 * Note that ghosts and rock-eaters are never allowed to "flow",\n
 * since they should move directly towards the player.\n
 *\n
 * Prefer "non-diagonal" directions, but twiddle them a little\n
 * to angle slightly towards the player's actual location.\n
 *\n
 * Allow very perceptive monsters to track old "spoor" left by\n
 * previous locations occupied by the player.  This will tend\n
 * to have monsters end up either near the player or on a grid\n
 * recently occupied by the player (and left via "teleport").\n
 *\n
 * Note that if "smell" is turned on, all monsters get vicious.\n
 *\n
 * Also note that teleporting away from a location will cause\n
 * the monsters who were chasing you to converge on that location\n
 * as long as you are still near enough to "annoy" them without\n
 * being close enough to chase directly.  I have no idea what will\n
 * happen if you combine "smell" with low "aaf" values.\n
 */
static bool get_moves_aux(player_type *target_ptr, MONSTER_IDX m_idx, POSITION *yp, POSITION *xp, bool no_flow)
{
        grid_type *g_ptr;
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        monster_type *m_ptr = &floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];

        if (r_ptr->flags4 & (RF4_ATTACK_MASK) ||
                r_ptr->a_ability_flags1 & (RF5_ATTACK_MASK) ||
                r_ptr->a_ability_flags2 & (RF6_ATTACK_MASK))
        {
                if (get_moves_aux2(target_ptr, m_idx, yp, xp)) return TRUE;
        }

        if (no_flow) return FALSE;
        if ((r_ptr->flags2 & RF2_PASS_WALL) && ((m_idx != target_ptr->riding) || target_ptr->pass_wall)) return FALSE;
        if ((r_ptr->flags2 & RF2_KILL_WALL) && (m_idx != target_ptr->riding)) return FALSE;

        POSITION y1 = m_ptr->fy;
        POSITION x1 = m_ptr->fx;
        if (player_has_los_bold(target_ptr, y1, x1) && projectable(target_ptr, target_ptr->y, target_ptr->x, y1, x1)) return FALSE;

        g_ptr = &floor_ptr->grid_array[y1][x1];

        int best;
        bool use_scent = FALSE;
        if (g_ptr->cost)
        {
                best = 999;
        }
        else if (g_ptr->when)
        {
                if (floor_ptr->grid_array[target_ptr->y][target_ptr->x].when - g_ptr->when > 127) return FALSE;

                use_scent = TRUE;
                best = 0;
        }
        else
        {
                return FALSE;
        }

        for (int i = 7; i >= 0; i--)
        {
                POSITION y = y1 + ddy_ddd[i];
                POSITION x = x1 + ddx_ddd[i];

                if (!in_bounds2(floor_ptr, y, x)) continue;

                g_ptr = &floor_ptr->grid_array[y][x];
                if (use_scent)
                {
                        int when = g_ptr->when;
                        if (best > when) continue;

                        best = when;
                }
                else
                {
                        int cost;
                        if (r_ptr->flags2 & (RF2_BASH_DOOR | RF2_OPEN_DOOR))
                        {
                                cost = g_ptr->dist;
                        }
                        else
                        {
                                cost = g_ptr->cost;
                        }

                        if ((cost == 0) || (best < cost)) continue;

                        best = cost;
                }

                *yp = target_ptr->y + 16 * ddy_ddd[i];
                *xp = target_ptr->x + 16 * ddx_ddd[i];
        }

        if (best == 999 || best == 0) return FALSE;

        return TRUE;
}


/*!
 * @brief モンスターがプレイヤーから逃走することが可能なマスを走査する /
 * Provide a location to flee to, but give the player a wide berth.
 * @param m_idx モンスターの参照ID
 * @param yp 移動先のマスのY座標を返す参照ポインタ
 * @param xp 移動先のマスのX座標を返す参照ポインタ
 * @return 有効なマスがあった場合TRUEを返す
 * @details
 * A monster may wish to flee to a location that is behind the player,\n
 * but instead of heading directly for it, the monster should "swerve"\n
 * around the player so that he has a smaller chance of getting hit.\n
 */
static bool get_fear_moves_aux(floor_type *floor_ptr, MONSTER_IDX m_idx, POSITION *yp, POSITION *xp)
{
        POSITION gy = 0, gx = 0;

        monster_type *m_ptr = &floor_ptr->m_list[m_idx];
        POSITION fy = m_ptr->fy;
        POSITION fx = m_ptr->fx;

        POSITION y1 = fy - (*yp);
        POSITION x1 = fx - (*xp);

        int score = -1;
        for (int i = 7; i >= 0; i--)
        {
                POSITION y = fy + ddy_ddd[i];
                POSITION x = fx + ddx_ddd[i];
                if (!in_bounds2(floor_ptr, y, x)) continue;

                POSITION dis = distance(y, x, y1, x1);
                POSITION s = 5000 / (dis + 3) - 500 / (floor_ptr->grid_array[y][x].dist + 1);
                if (s < 0) s = 0;

                if (s < score) continue;

                score = s;
                gy = y;
                gx = x;
        }

        if (score == -1) return FALSE;

        (*yp) = fy - gy;
        (*xp) = fx - gx;

        return TRUE;
}


/*
 * Hack -- Precompute a bunch of calls to distance() in find_safety() and
 * find_hiding().
 *
 * The pair of arrays dist_offsets_y[n] and dist_offsets_x[n] contain the
 * offsets of all the locations with a distance of n from a central point,
 * with an offset of (0,0) indicating no more offsets at this distance.
 *
 * This is, of course, fairly unreadable, but it eliminates multiple loops
 * from the previous version.
 *
 * It is probably better to replace these arrays with code to compute
 * the relevant arrays, even if the storage is pre-allocated in hard
 * coded sizes.  At the very least, code should be included which is
 * able to generate and dump these arrays (ala "los()").
 *
 * Also, the storage needs could be halved by using bytes.
 *
 * These arrays could be combined into two big arrays, using sub-arrays
 * to hold the offsets and lengths of each portion of the sub-arrays, and
 * this could perhaps also be used somehow in the "look" code.
 */


static POSITION d_off_y_0[] = { 0 };
static POSITION d_off_x_0[] = { 0 };

static POSITION d_off_y_1[] = { -1, -1, -1, 0, 0, 1, 1, 1, 0 };
static POSITION d_off_x_1[] = { -1, 0, 1, -1, 1, -1, 0, 1, 0 };

static POSITION d_off_y_2[] = { -1, -1, -2, -2, -2, 0, 0, 1, 1, 2, 2, 2, 0 };
static POSITION d_off_x_2[] = { -2, 2, -1, 0, 1, -2, 2, -2, 2, -1, 0, 1, 0 };

static POSITION d_off_y_3[] = { -1, -1, -2, -2, -3, -3, -3, 0, 0, 1, 1, 2, 2, 3, 3, 3, 0 };
static POSITION d_off_x_3[] = { -3, 3, -2, 2, -1, 0, 1, -3, 3, -3, 3, -2, 2, -1, 0, 1, 0 };

static POSITION d_off_y_4[] = { -1, -1, -2, -2, -3, -3, -3, -3, -4, -4, -4, 0, 0, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 0 };
static POSITION d_off_x_4[] = { -4, 4, -3, 3, -2, -3, 2, 3, -1, 0, 1, -4, 4, -4, 4, -3, 3, -2, -3, 2, 3, -1, 0, 1, 0 };


static POSITION d_off_y_5[] =
{ -1, -1, -2, -2, -3, -3, -4, -4, -4, -4, -5, -5,
  -5, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5,
  5, 0 };

static POSITION d_off_x_5[] =
{ -5, 5, -4, 4, -4, 4, -2, -3, 2, 3, -1, 0, 1,
  -5, 5, -5, 5, -4, 4, -4, 4, -2, -3, 2, 3, -1,
  0, 1, 0 };


static POSITION d_off_y_6[] =
{ -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -5, -5,
  -6, -6, -6, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5,
  5, 5, 6, 6, 6, 0 };

static POSITION d_off_x_6[] =
{ -6, 6, -5, 5, -5, 5, -4, 4, -2, -3, 2, 3, -1,
  0, 1, -6, 6, -6, 6, -5, 5, -5, 5, -4, 4, -2,
  -3, 2, 3, -1, 0, 1, 0 };


static POSITION d_off_y_7[] =
{ -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -5, -5,
  -6, -6, -6, -6, -7, -7, -7, 0, 0, 1, 1, 2, 2, 3,
  3, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 0 };

static POSITION d_off_x_7[] =
{ -7, 7, -6, 6, -6, 6, -5, 5, -4, -5, 4, 5, -2,
  -3, 2, 3, -1, 0, 1, -7, 7, -7, 7, -6, 6, -6,
  6, -5, 5, -4, -5, 4, 5, -2, -3, 2, 3, -1, 0,
  1, 0 };


static POSITION d_off_y_8[] =
{ -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -6, -6,
  -6, -6, -7, -7, -7, -7, -8, -8, -8, 0, 0, 1, 1,
  2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,
  8, 8, 8, 0 };

static POSITION d_off_x_8[] =
{ -8, 8, -7, 7, -7, 7, -6, 6, -6, 6, -4, -5, 4,
  5, -2, -3, 2, 3, -1, 0, 1, -8, 8, -8, 8, -7,
  7, -7, 7, -6, 6, -6, 6, -4, -5, 4, 5, -2, -3,
  2, 3, -1, 0, 1, 0 };


static POSITION d_off_y_9[] =
{ -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -6, -6,
  -7, -7, -7, -7, -8, -8, -8, -8, -9, -9, -9, 0,
  0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 7,
  7, 8, 8, 8, 8, 9, 9, 9, 0 };

static POSITION d_off_x_9[] =
{ -9, 9, -8, 8, -8, 8, -7, 7, -7, 7, -6, 6, -4,
  -5, 4, 5, -2, -3, 2, 3, -1, 0, 1, -9, 9, -9,
  9, -8, 8, -8, 8, -7, 7, -7, 7, -6, 6, -4, -5,
  4, 5, -2, -3, 2, 3, -1, 0, 1, 0 };


static POSITION *dist_offsets_y[10] =
{
        d_off_y_0, d_off_y_1, d_off_y_2, d_off_y_3, d_off_y_4,
        d_off_y_5, d_off_y_6, d_off_y_7, d_off_y_8, d_off_y_9
};

static POSITION *dist_offsets_x[10] =
{
        d_off_x_0, d_off_x_1, d_off_x_2, d_off_x_3, d_off_x_4,
        d_off_x_5, d_off_x_6, d_off_x_7, d_off_x_8, d_off_x_9
};

/*!
 * @brief モンスターが逃げ込める安全な地点を返す /
 * Choose a "safe" location near a monster for it to run toward.
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターの参照ID
 * @param yp 移動先のマスのY座標を返す参照ポインタ
 * @param xp 移動先のマスのX座標を返す参照ポインタ
 * @return 有効なマスがあった場合TRUEを返す
 * @details
 * A location is "safe" if it can be reached quickly and the player\n
 * is not able to fire into it (it isn't a "clean shot").  So, this will\n
 * cause monsters to "duck" behind walls.  Hopefully, monsters will also\n
 * try to run towards corridor openings if they are in a room.\n
 *\n
 * This function may take lots of CPU time if lots of monsters are\n
 * fleeing.\n
 *\n
 * Return TRUE if a safe location is available.\n
 */
static bool find_safety(player_type *target_ptr, MONSTER_IDX m_idx, POSITION *yp, POSITION *xp)
{
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        monster_type *m_ptr = &floor_ptr->m_list[m_idx];

        POSITION fy = m_ptr->fy;
        POSITION fx = m_ptr->fx;

        POSITION gy = 0, gx = 0, gdis = 0;

        for (POSITION d = 1; d < 10; d++)
        {
                POSITION *y_offsets;
                y_offsets = dist_offsets_y[d];

                POSITION *x_offsets;
                x_offsets = dist_offsets_x[d];

                for (POSITION i = 0, dx = x_offsets[0], dy = y_offsets[0];
                        dx != 0 || dy != 0;
                        i++, dx = x_offsets[i], dy = y_offsets[i])
                {
                        POSITION y = fy + dy;
                        POSITION x = fx + dx;
                        if (!in_bounds(floor_ptr, y, x)) continue;

                        grid_type *g_ptr;
                        g_ptr = &floor_ptr->grid_array[y][x];

                        BIT_FLAGS16 riding_mode = (m_idx == target_ptr->riding) ? CEM_RIDING : 0;
                        if (!monster_can_cross_terrain(target_ptr, g_ptr->feat, &r_info[m_ptr->r_idx], riding_mode))
                                continue;

                        if (!(m_ptr->mflag2 & MFLAG2_NOFLOW))
                        {
                                if (g_ptr->dist == 0) continue;
                                if (g_ptr->dist > floor_ptr->grid_array[fy][fx].dist + 2 * d) continue;
                        }

                        if (projectable(target_ptr, target_ptr->y, target_ptr->x, y, x)) continue;

                        POSITION dis = distance(y, x, target_ptr->y, target_ptr->x);
                        if (dis <= gdis) continue;

                        gy = y;
                        gx = x;
                        gdis = dis;
                }

                if (gdis <= 0) continue;

                *yp = fy - gy;
                *xp = fx - gx;

                return TRUE;
        }

        return FALSE;
}


/*!
 * @brief モンスターが隠れ潜める地点を返す /
 * Choose a good hiding place near a monster for it to run toward.
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターの参照ID
 * @param yp 移動先のマスのY座標を返す参照ポインタ
 * @param xp 移動先のマスのX座標を返す参照ポインタ
 * @return 有効なマスがあった場合TRUEを返す
 * @details
 * Pack monsters will use this to "ambush" the player and lure him out\n
 * of corridors into open space so they can swarm him.\n
 *\n
 * Return TRUE if a good location is available.\n
 */
static bool find_hiding(player_type *target_ptr, MONSTER_IDX m_idx, POSITION *yp, POSITION *xp)
{
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        monster_type *m_ptr = &floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];

        POSITION fy = m_ptr->fy;
        POSITION fx = m_ptr->fx;

        POSITION gy = 0, gx = 0, gdis = 999;

        for (POSITION d = 1; d < 10; d++)
        {
                POSITION *y_offsets;
                y_offsets = dist_offsets_y[d];

                POSITION *x_offsets;
                x_offsets = dist_offsets_x[d];

                for (POSITION i = 0, dx = x_offsets[0], dy = y_offsets[0];
                        dx != 0 || dy != 0;
                        i++, dx = x_offsets[i], dy = y_offsets[i])
                {
                        POSITION y = fy + dy;
                        POSITION x = fx + dx;

                        if (!in_bounds(floor_ptr, y, x)) continue;
                        if (!monster_can_enter(target_ptr, y, x, r_ptr, 0)) continue;
                        if (projectable(target_ptr, target_ptr->y, target_ptr->x, y, x) && clean_shot(target_ptr, fy, fx, y, x, FALSE))
                                continue;

                        POSITION dis = distance(y, x, target_ptr->y, target_ptr->x);
                        if (dis < gdis && dis >= 2)
                        {
                                gy = y;
                                gx = x;
                                gdis = dis;
                        }
                }

                if (gdis >= 999) continue;

                *yp = fy - gy;
                *xp = fx - gx;

                return TRUE;
        }

        return FALSE;
}


/*!
 * @brief モンスターの移動方向を返す /
 * Choose "logical" directions for monster movement
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターの参照ID
 * @param mm 移動方向を返す方向IDの参照ポインタ
 * @return 有効方向があった場合TRUEを返す
 */
static bool get_moves(player_type *target_ptr, MONSTER_IDX m_idx, DIRECTION *mm)
{
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        monster_type *m_ptr = &floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        POSITION y = 0, ay, x = 0, ax;
        POSITION y2 = target_ptr->y;
        POSITION x2 = target_ptr->x;
        bool done = FALSE;
        bool will_run = mon_will_run(target_ptr, m_idx);
        grid_type *g_ptr;
        bool no_flow = ((m_ptr->mflag2 & MFLAG2_NOFLOW) != 0) && (floor_ptr->grid_array[m_ptr->fy][m_ptr->fx].cost > 2);
        bool can_pass_wall = ((r_ptr->flags2 & RF2_PASS_WALL) != 0) && ((m_idx != target_ptr->riding) || target_ptr->pass_wall);

        if (!will_run && m_ptr->target_y)
        {
                int t_m_idx = floor_ptr->grid_array[m_ptr->target_y][m_ptr->target_x].m_idx;
                if ((t_m_idx > 0) &&
                        are_enemies(target_ptr, m_ptr, &floor_ptr->m_list[t_m_idx]) &&
                        los(target_ptr, m_ptr->fy, m_ptr->fx, m_ptr->target_y, m_ptr->target_x) &&
                        projectable(target_ptr, m_ptr->fy, m_ptr->fx, m_ptr->target_y, m_ptr->target_x))
                {
                        y = m_ptr->fy - m_ptr->target_y;
                        x = m_ptr->fx - m_ptr->target_x;
                        done = TRUE;
                }
        }

        if (!done && !will_run && is_hostile(m_ptr) &&
                (r_ptr->flags1 & RF1_FRIENDS) &&
                ((los(target_ptr, m_ptr->fy, m_ptr->fx, target_ptr->y, target_ptr->x) && projectable(target_ptr, m_ptr->fy, m_ptr->fx, target_ptr->y, target_ptr->x)) ||
                (floor_ptr->grid_array[m_ptr->fy][m_ptr->fx].dist < MAX_SIGHT / 2)))
        {
                if ((r_ptr->flags3 & RF3_ANIMAL) && !can_pass_wall &&
                        !(r_ptr->flags2 & RF2_KILL_WALL))
                {
                        int room = 0;
                        for (int i = 0; i < 8; i++)
                        {
                                int xx = target_ptr->x + ddx_ddd[i];
                                int yy = target_ptr->y + ddy_ddd[i];

                                if (!in_bounds2(floor_ptr, yy, xx)) continue;

                                g_ptr = &floor_ptr->grid_array[yy][xx];
                                if (monster_can_cross_terrain(target_ptr, g_ptr->feat, r_ptr, 0))
                                {
                                        room++;
                                }
                        }

                        if (floor_ptr->grid_array[target_ptr->y][target_ptr->x].info & CAVE_ROOM) room -= 2;
                        if (!r_ptr->flags4 && !r_ptr->a_ability_flags1 && !r_ptr->a_ability_flags2) room -= 2;

                        if (room < (8 * (target_ptr->chp + target_ptr->csp)) /
                                (target_ptr->mhp + target_ptr->msp))
                        {
                                if (find_hiding(target_ptr, m_idx, &y, &x)) done = TRUE;
                        }
                }

                if (!done && (floor_ptr->grid_array[m_ptr->fy][m_ptr->fx].dist < 3))
                {
                        for (int i = 0; i < 8; i++)
                        {
                                y2 = target_ptr->y + ddy_ddd[(m_idx + i) & 7];
                                x2 = target_ptr->x + ddx_ddd[(m_idx + i) & 7];
                                if ((m_ptr->fy == y2) && (m_ptr->fx == x2))
                                {
                                        y2 = target_ptr->y;
                                        x2 = target_ptr->x;
                                        break;
                                }

                                if (!in_bounds2(floor_ptr, y2, x2)) continue;
                                if (!monster_can_enter(target_ptr, y2, x2, r_ptr, 0)) continue;

                                break;
                        }

                        y = m_ptr->fy - y2;
                        x = m_ptr->fx - x2;
                        done = TRUE;
                }
        }

        if (!done)
        {
                (void)get_moves_aux(target_ptr, m_idx, &y2, &x2, no_flow);
                y = m_ptr->fy - y2;
                x = m_ptr->fx - x2;
        }

        if (is_pet(m_ptr) && will_run)
        {
                y = (-y), x = (-x);
        }
        else
        {
                if (!done && will_run)
                {
                        int tmp_x = (-x);
                        int tmp_y = (-y);
                        if (find_safety(target_ptr, m_idx, &y, &x) && !no_flow)
                        {
                                if (get_fear_moves_aux(target_ptr->current_floor_ptr, m_idx, &y, &x))
                                        done = TRUE;
                        }

                        if (!done)
                        {
                                y = tmp_y;
                                x = tmp_x;
                        }
                }
        }

        if (!x && !y) return FALSE;

        ax = ABS(x);
        ay = ABS(y);

        int move_val = 0;
        if (y < 0) move_val += 8;
        if (x > 0) move_val += 4;

        if (ay > (ax << 1)) move_val += 2;
        else if (ax > (ay << 1)) move_val++;

        switch (move_val)
        {
        case 0:
                mm[0] = 9;
                if (ay > ax)
                {
                        mm[1] = 8;
                        mm[2] = 6;
                        mm[3] = 7;
                        mm[4] = 3;
                }
                else
                {
                        mm[1] = 6;
                        mm[2] = 8;
                        mm[3] = 3;
                        mm[4] = 7;
                }
                break;
        case 1:
        case 9:
                mm[0] = 6;
                if (y < 0)
                {
                        mm[1] = 3;
                        mm[2] = 9;
                        mm[3] = 2;
                        mm[4] = 8;
                }
                else
                {
                        mm[1] = 9;
                        mm[2] = 3;
                        mm[3] = 8;
                        mm[4] = 2;
                }
                break;
        case 2:
        case 6:
                mm[0] = 8;
                if (x < 0)
                {
                        mm[1] = 9;
                        mm[2] = 7;
                        mm[3] = 6;
                        mm[4] = 4;
                }
                else
                {
                        mm[1] = 7;
                        mm[2] = 9;
                        mm[3] = 4;
                        mm[4] = 6;
                }
                break;
        case 4:
                mm[0] = 7;
                if (ay > ax)
                {
                        mm[1] = 8;
                        mm[2] = 4;
                        mm[3] = 9;
                        mm[4] = 1;
                }
                else
                {
                        mm[1] = 4;
                        mm[2] = 8;
                        mm[3] = 1;
                        mm[4] = 9;
                }
                break;
        case 5:
        case 13:
                mm[0] = 4;
                if (y < 0)
                {
                        mm[1] = 1;
                        mm[2] = 7;
                        mm[3] = 2;
                        mm[4] = 8;
                }
                else
                {
                        mm[1] = 7;
                        mm[2] = 1;
                        mm[3] = 8;
                        mm[4] = 2;
                }
                break;
        case 8:
                mm[0] = 3;
                if (ay > ax)
                {
                        mm[1] = 2;
                        mm[2] = 6;
                        mm[3] = 1;
                        mm[4] = 9;
                }
                else
                {
                        mm[1] = 6;
                        mm[2] = 2;
                        mm[3] = 9;
                        mm[4] = 1;
                }
                break;
        case 10:
        case 14:
                mm[0] = 2;
                if (x < 0)
                {
                        mm[1] = 3;
                        mm[2] = 1;
                        mm[3] = 6;
                        mm[4] = 4;
                }
                else
                {
                        mm[1] = 1;
                        mm[2] = 3;
                        mm[3] = 4;
                        mm[4] = 6;
                }
                break;
        case 12:
                mm[0] = 1;
                if (ay > ax)
                {
                        mm[1] = 2;
                        mm[2] = 4;
                        mm[3] = 3;
                        mm[4] = 7;
                }
                else
                {
                        mm[1] = 4;
                        mm[2] = 2;
                        mm[3] = 7;
                        mm[4] = 3;
                }
                break;
        }

        return TRUE;
}


static bool check_hp_for_feat_destruction(feature_type *f_ptr, monster_type *m_ptr)
{
        return !have_flag(f_ptr->flags, FF_GLASS) ||
                (r_info[m_ptr->r_idx].flags2 & RF2_STUPID) ||
                (m_ptr->hp >= MAX(m_ptr->maxhp / 3, 200));
}


/*!
 * @brief モンスター単体の1ターン行動処理メインルーチン /
 * Process a monster
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx 行動モンスターの参照ID
 * @return なし
 * @details
 * The monster is known to be within 100 grids of the player\n
 *\n
 * In several cases, we directly update the monster lore\n
 *\n
 * Note that a monster is only allowed to "reproduce" if there\n
 * are a limited number of "reproducing" monsters on the current\n
 * level.  This should prevent the level from being "swamped" by\n
 * reproducing monsters.  It also allows a large mass of mice to\n
 * prevent a louse from multiplying, but this is a small price to\n
 * pay for a simple multiplication method.\n
 *\n
 * XXX Monster fear is slightly odd, in particular, monsters will\n
 * fixate on opening a door even if they cannot open it.  Actually,\n
 * the same thing happens to normal monsters when they hit a door\n
 *\n
 * In addition, monsters which *cannot* open or bash\n
 * down a door will still stand there trying to open it...\n
 *\n
 * XXX Technically, need to check for monster in the way\n
 * combined with that monster being in a wall (or door?)\n
 *\n
 * A "direction" of "5" means "pick a random direction".\n
 */
void process_monster(player_type *target_ptr, MONSTER_IDX m_idx)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        monster_race *ap_r_ptr = &r_info[m_ptr->ap_r_idx];
        DIRECTION mm[8];

        turn_flags tmp_flags;
        turn_flags *turn_flags_ptr = &tmp_flags;
        turn_flags_ptr->is_riding_mon = (m_idx == target_ptr->riding);
        turn_flags_ptr->do_turn = FALSE;
        turn_flags_ptr->do_move = FALSE;
        turn_flags_ptr->do_view = FALSE;
        turn_flags_ptr->must_alter_to_move = FALSE;
        turn_flags_ptr->did_open_door = FALSE;
        turn_flags_ptr->did_bash_door = FALSE;
        turn_flags_ptr->did_take_item = FALSE;
        turn_flags_ptr->did_kill_item = FALSE;
        turn_flags_ptr->did_move_body = FALSE;
        turn_flags_ptr->did_pass_wall = FALSE;
        turn_flags_ptr->did_kill_wall = FALSE;

        bool see_m = is_seen(m_ptr);

        decide_drop_from_monster(target_ptr, m_idx, turn_flags_ptr->is_riding_mon);
        if ((m_ptr->mflag2 & MFLAG2_CHAMELEON) && one_in_(13) && !MON_CSLEEP(m_ptr))
        {
                choose_new_monster(target_ptr, m_idx, FALSE, 0);
                r_ptr = &r_info[m_ptr->r_idx];
        }

        bool aware = TRUE;
        if (target_ptr->special_defense & NINJA_S_STEALTH)
        {
                int tmp = target_ptr->lev * 6 + (target_ptr->skill_stl + 10) * 4;
                if (target_ptr->monlite) tmp /= 3;
                if (target_ptr->cursed & TRC_AGGRAVATE) tmp /= 2;
                if (r_ptr->level > (target_ptr->lev * target_ptr->lev / 20 + 10)) tmp /= 3;
                if (randint0(tmp) > (r_ptr->level + 20)) aware = FALSE;
        }

        if (vanish_summoned_children(target_ptr, m_idx, see_m)) return;
        if (process_quantum_effect(target_ptr,m_idx, see_m)) return;

        if (m_ptr->r_idx == MON_SHURYUUDAN)
        {
                bool fear, dead;
                mon_take_hit_mon(target_ptr, m_idx, 1, &dead, &fear, _("は爆発して粉々になった。", " explodes into tiny shreds."), m_idx);
                if (dead) return;
        }

        if (runaway_monster(target_ptr, m_idx, turn_flags_ptr->is_riding_mon, see_m)) return;

        awake_monster(target_ptr, m_idx);

        if (MON_STUNNED(m_ptr))
        {
                if (one_in_(2)) return;
        }

        if (turn_flags_ptr->is_riding_mon)
        {
                target_ptr->update |= (PU_BONUS);
        }

        process_angar(target_ptr, m_idx, see_m);

        POSITION oy = m_ptr->fy;
        POSITION ox = m_ptr->fx;
        if (decide_monster_multiplication(target_ptr, m_idx, oy, ox)) return;

        process_special(target_ptr, m_idx);
        process_speak_sound(target_ptr, m_idx, oy, ox, aware);
        if (cast_spell(target_ptr, m_idx, aware)) return;

        mm[0] = mm[1] = mm[2] = mm[3] = 0;
        mm[4] = mm[5] = mm[6] = mm[7] = 0;

        if (!decide_monster_movement_direction(target_ptr, mm, m_idx, aware)) return;

        int i;
        for (i = 0; mm[i]; i++)
        {
                int d = mm[i];
                if (d == 5) d = ddd[randint0(8)];

                POSITION ny = oy + ddy[d];
                POSITION nx = ox + ddx[d];
                if (!in_bounds2(target_ptr->current_floor_ptr, ny, nx)) continue;

                grid_type *g_ptr;
                g_ptr = &target_ptr->current_floor_ptr->grid_array[ny][nx];
                feature_type *f_ptr;
                f_ptr = &f_info[g_ptr->feat];
                bool can_cross = monster_can_cross_terrain(target_ptr, g_ptr->feat, r_ptr, turn_flags_ptr->is_riding_mon ? CEM_RIDING : 0);
                monster_type *y_ptr;
                y_ptr = &target_ptr->current_floor_ptr->m_list[g_ptr->m_idx];

                if (!process_wall(target_ptr, turn_flags_ptr, m_ptr, ny, nx, can_cross))
                {
                        if (!process_door(target_ptr, turn_flags_ptr, m_ptr, ny, nx))
                                return;
                }

                if (!process_protection_rune(target_ptr, turn_flags_ptr, m_ptr, ny, nx))
                {
                        if (!process_explosive_rune(target_ptr, turn_flags_ptr, m_ptr, ny, nx))
                                return;
                }

                exe_monster_attack_to_player(target_ptr, turn_flags_ptr, m_idx, ny, nx);
                if (process_monster_attack_to_monster(target_ptr, turn_flags_ptr, m_idx, g_ptr, can_cross)) return;

                if (turn_flags_ptr->is_riding_mon)
                {
                        if (!target_ptr->riding_ryoute && !MON_MONFEAR(&target_ptr->current_floor_ptr->m_list[target_ptr->riding])) turn_flags_ptr->do_move = FALSE;
                }

                if (turn_flags_ptr->did_kill_wall && turn_flags_ptr->do_move)
                {
                        if (one_in_(GRINDNOISE))
                        {
                                if (have_flag(f_ptr->flags, FF_GLASS))
                                        msg_print(_("何かの砕ける音が聞こえる。", "There is a crashing sound."));
                                else
                                        msg_print(_("ギシギシいう音が聞こえる。", "There is a grinding sound."));
                        }

                        cave_alter_feat(target_ptr, ny, nx, FF_HURT_DISI);

                        if (!monster_is_valid(m_ptr))
                        {
                                target_ptr->update |= (PU_FLOW);
                                target_ptr->window |= (PW_OVERHEAD | PW_DUNGEON);
                                if (is_original_ap_and_seen(target_ptr, m_ptr)) r_ptr->r_flags2 |= (RF2_KILL_WALL);

                                return;
                        }

                        f_ptr = &f_info[g_ptr->feat];
                        turn_flags_ptr->do_view = TRUE;
                        turn_flags_ptr->do_turn = TRUE;
                }

                if (turn_flags_ptr->must_alter_to_move && (r_ptr->flags7 & RF7_AQUATIC))
                {
                        if (!monster_can_cross_terrain(target_ptr, g_ptr->feat, r_ptr, turn_flags_ptr->is_riding_mon ? CEM_RIDING : 0))
                        {
                                turn_flags_ptr->do_move = FALSE;
                        }
                }

                if (turn_flags_ptr->do_move && !can_cross && !turn_flags_ptr->did_kill_wall && !turn_flags_ptr->did_bash_door)
                {
                        turn_flags_ptr->do_move = FALSE;
                }

                if (turn_flags_ptr->do_move && (r_ptr->flags1 & RF1_NEVER_MOVE))
                {
                        if (is_original_ap_and_seen(target_ptr, m_ptr)) r_ptr->r_flags1 |= (RF1_NEVER_MOVE);

                        turn_flags_ptr->do_move = FALSE;
                }

                if (!turn_flags_ptr->do_move)
                {
                        if (turn_flags_ptr->do_turn) break;

                        continue;
                }

                turn_flags_ptr->do_turn = TRUE;
                if (have_flag(f_ptr->flags, FF_TREE))
                {
                        if (!(r_ptr->flags7 & RF7_CAN_FLY) && !(r_ptr->flags8 & RF8_WILD_WOOD))
                        {
                                m_ptr->energy_need += ENERGY_NEED();
                        }
                }

                if (!turn_flags_ptr->is_riding_mon)
                {
                        target_ptr->current_floor_ptr->grid_array[oy][ox].m_idx = g_ptr->m_idx;
                        if (g_ptr->m_idx)
                        {
                                y_ptr->fy = oy;
                                y_ptr->fx = ox;
                                update_monster(target_ptr, g_ptr->m_idx, TRUE);
                        }

                        g_ptr->m_idx = m_idx;
                        m_ptr->fy = ny;
                        m_ptr->fx = nx;
                        update_monster(target_ptr, m_idx, TRUE);

                        lite_spot(target_ptr, oy, ox);
                        lite_spot(target_ptr, ny, nx);
                }
                else
                {
                        if (!move_player_effect(target_ptr, ny, nx, MPE_DONT_PICKUP)) break;
                }

                if (m_ptr->ml &&
                        (disturb_move ||
                        (disturb_near && (m_ptr->mflag & MFLAG_VIEW) && projectable(target_ptr, target_ptr->y, target_ptr->x, m_ptr->fy, m_ptr->fx)) ||
                                (disturb_high && ap_r_ptr->r_tkills && ap_r_ptr->level >= target_ptr->lev)))
                {
                        if (is_hostile(m_ptr))
                                disturb(target_ptr, FALSE, TRUE);
                }

                bool is_takable_or_killable = g_ptr->o_idx > 0;
                is_takable_or_killable &= (r_ptr->flags2 & (RF2_TAKE_ITEM | RF2_KILL_ITEM)) != 0;

                bool is_pickup_items = (target_ptr->pet_extra_flags & PF_PICKUP_ITEMS) != 0;
                is_pickup_items &= (r_ptr->flags2 & RF2_TAKE_ITEM) != 0;

                is_takable_or_killable &= !is_pet(m_ptr) || is_pickup_items;
                if (!is_takable_or_killable)
                {
                        if (turn_flags_ptr->do_turn) break;

                        continue;
                }

                OBJECT_IDX this_o_idx, next_o_idx;
                turn_flags_ptr->do_take = (r_ptr->flags2 & RF2_TAKE_ITEM) != 0;
                for (this_o_idx = g_ptr->o_idx; this_o_idx; this_o_idx = next_o_idx)
                {
                        BIT_FLAGS flgs[TR_FLAG_SIZE], flg2 = 0L, flg3 = 0L, flgr = 0L;
                        GAME_TEXT m_name[MAX_NLEN], o_name[MAX_NLEN];
                        object_type *o_ptr = &target_ptr->current_floor_ptr->o_list[this_o_idx];
                        next_o_idx = o_ptr->next_o_idx;

                        if (turn_flags_ptr->do_take)
                        {
                                /* Skip gold, corpse and statue */
                                if (o_ptr->tval == TV_GOLD || (o_ptr->tval == TV_CORPSE) || (o_ptr->tval == TV_STATUE))
                                        continue;
                        }

                        object_flags(o_ptr, flgs);
                        object_desc(target_ptr, o_name, o_ptr, 0);
                        monster_desc(target_ptr, m_name, m_ptr, MD_INDEF_HIDDEN);

                        if (have_flag(flgs, TR_SLAY_DRAGON)) flg3 |= (RF3_DRAGON);
                        if (have_flag(flgs, TR_KILL_DRAGON)) flg3 |= (RF3_DRAGON);
                        if (have_flag(flgs, TR_SLAY_TROLL))  flg3 |= (RF3_TROLL);
                        if (have_flag(flgs, TR_KILL_TROLL))  flg3 |= (RF3_TROLL);
                        if (have_flag(flgs, TR_SLAY_GIANT))  flg3 |= (RF3_GIANT);
                        if (have_flag(flgs, TR_KILL_GIANT))  flg3 |= (RF3_GIANT);
                        if (have_flag(flgs, TR_SLAY_ORC))    flg3 |= (RF3_ORC);
                        if (have_flag(flgs, TR_KILL_ORC))    flg3 |= (RF3_ORC);
                        if (have_flag(flgs, TR_SLAY_DEMON))  flg3 |= (RF3_DEMON);
                        if (have_flag(flgs, TR_KILL_DEMON))  flg3 |= (RF3_DEMON);
                        if (have_flag(flgs, TR_SLAY_UNDEAD)) flg3 |= (RF3_UNDEAD);
                        if (have_flag(flgs, TR_KILL_UNDEAD)) flg3 |= (RF3_UNDEAD);
                        if (have_flag(flgs, TR_SLAY_ANIMAL)) flg3 |= (RF3_ANIMAL);
                        if (have_flag(flgs, TR_KILL_ANIMAL)) flg3 |= (RF3_ANIMAL);
                        if (have_flag(flgs, TR_SLAY_EVIL))   flg3 |= (RF3_EVIL);
                        if (have_flag(flgs, TR_KILL_EVIL))   flg3 |= (RF3_EVIL);
                        if (have_flag(flgs, TR_SLAY_HUMAN))  flg2 |= (RF2_HUMAN);
                        if (have_flag(flgs, TR_KILL_HUMAN))  flg2 |= (RF2_HUMAN);
                        if (have_flag(flgs, TR_BRAND_ACID))  flgr |= (RFR_IM_ACID);
                        if (have_flag(flgs, TR_BRAND_ELEC))  flgr |= (RFR_IM_ELEC);
                        if (have_flag(flgs, TR_BRAND_FIRE))  flgr |= (RFR_IM_FIRE);
                        if (have_flag(flgs, TR_BRAND_COLD))  flgr |= (RFR_IM_COLD);
                        if (have_flag(flgs, TR_BRAND_POIS))  flgr |= (RFR_IM_POIS);

                        if (object_is_artifact(o_ptr) || (r_ptr->flags3 & flg3) || (r_ptr->flags2 & flg2) ||
                                ((~(r_ptr->flagsr) & flgr) && !(r_ptr->flagsr & RFR_RES_ALL)))
                        {
                                if (turn_flags_ptr->do_take && (r_ptr->flags2 & RF2_STUPID))
                                {
                                        turn_flags_ptr->did_take_item = TRUE;
                                        if (m_ptr->ml && player_can_see_bold(target_ptr, ny, nx))
                                        {
                                                msg_format(_("%^sは%sを拾おうとしたが、だめだった。", "%^s tries to pick up %s, but fails."), m_name, o_name);
                                        }
                                }
                        }
                        else if (turn_flags_ptr->do_take)
                        {
                                turn_flags_ptr->did_take_item = TRUE;
                                if (player_can_see_bold(target_ptr, ny, nx))
                                {
                                        msg_format(_("%^sが%sを拾った。", "%^s picks up %s."), m_name, o_name);
                                }

                                excise_object_idx(target_ptr->current_floor_ptr, this_o_idx);
                                o_ptr->marked &= OM_TOUCHED;
                                o_ptr->iy = o_ptr->ix = 0;
                                o_ptr->held_m_idx = m_idx;
                                o_ptr->next_o_idx = m_ptr->hold_o_idx;
                                m_ptr->hold_o_idx = this_o_idx;
                        }
                        else if (!is_pet(m_ptr))
                        {
                                turn_flags_ptr->did_kill_item = TRUE;
                                if (player_has_los_bold(target_ptr, ny, nx))
                                {
                                        msg_format(_("%^sが%sを破壊した。", "%^s destroys %s."), m_name, o_name);
                                }

                                delete_object_idx(target_ptr, this_o_idx);
                        }
                }

                if (turn_flags_ptr->do_turn) break;
        }

        /*
         *  Forward movements failed, but now received LOS attack!
         *  Try to flow by smell.
         */
        if (target_ptr->no_flowed && i > 2 && m_ptr->target_y)
                m_ptr->mflag2 &= ~MFLAG2_NOFLOW;

        if (!turn_flags_ptr->do_turn && !turn_flags_ptr->do_move && !MON_MONFEAR(m_ptr) && !turn_flags_ptr->is_riding_mon && aware)
        {
                if (r_ptr->freq_spell && randint1(100) <= r_ptr->freq_spell)
                {
                        if (make_attack_spell(m_idx, target_ptr)) return;
                }
        }

        if (turn_flags_ptr->do_view)
        {
                target_ptr->update |= (PU_FLOW);
                target_ptr->window |= (PW_OVERHEAD | PW_DUNGEON);
        }

        if (turn_flags_ptr->do_move && ((r_ptr->flags7 & (RF7_SELF_LD_MASK | RF7_HAS_DARK_1 | RF7_HAS_DARK_2))
                || ((r_ptr->flags7 & (RF7_HAS_LITE_1 | RF7_HAS_LITE_2)) && !target_ptr->phase_out)))
        {
                target_ptr->update |= (PU_MON_LITE);
        }

        if (is_original_ap_and_seen(target_ptr, m_ptr))
        {
                if (turn_flags_ptr->did_open_door) r_ptr->r_flags2 |= (RF2_OPEN_DOOR);
                if (turn_flags_ptr->did_bash_door) r_ptr->r_flags2 |= (RF2_BASH_DOOR);
                if (turn_flags_ptr->did_take_item) r_ptr->r_flags2 |= (RF2_TAKE_ITEM);
                if (turn_flags_ptr->did_kill_item) r_ptr->r_flags2 |= (RF2_KILL_ITEM);
                if (turn_flags_ptr->did_move_body) r_ptr->r_flags2 |= (RF2_MOVE_BODY);
                if (turn_flags_ptr->did_pass_wall) r_ptr->r_flags2 |= (RF2_PASS_WALL);
                if (turn_flags_ptr->did_kill_wall) r_ptr->r_flags2 |= (RF2_KILL_WALL);
        }

        bool is_battle_determined = !turn_flags_ptr->do_turn && !turn_flags_ptr->do_move && MON_MONFEAR(m_ptr) && aware;
        if (!is_battle_determined) return;

        (void)set_monster_monfear(target_ptr, m_idx, 0);
        if (see_m)
        {
                GAME_TEXT m_name[MAX_NLEN];
                monster_desc(target_ptr, m_name, m_ptr, 0);
                msg_format(_("%^sは戦いを決意した！", "%^s turns to fight!"), m_name);
        }

        if (m_ptr->ml) chg_virtue(target_ptr, V_COMPASSION, -1);
}


/*!
 * @brief 死亡したモンスターが乗馬中のモンスターだった場合に落馬処理を行う
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param is_riding_mon 騎乗中であればTRUE
 * @return なし
 */
void decide_drop_from_monster(player_type *target_ptr, MONSTER_IDX m_idx, bool is_riding_mon)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (!is_riding_mon || ((r_ptr->flags7 & RF7_RIDING) != 0)) return;

        if (rakuba(target_ptr, 0, TRUE))
        {
#ifdef JP
                msg_print("地面に落とされた。");
#else
                GAME_TEXT m_name[MAX_NLEN];
                monster_desc(target_ptr, m_name, &target_ptr->current_floor_ptr->m_list[target_ptr->riding], 0);
                msg_format("You have fallen from %s.", m_name);
#endif
        }
}


/*!
 * @brief 召喚の親元が消滅した時、子供も消滅させる
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param see_m モンスターが視界内にいたらTRUE
 * @return 召喚モンスターが消滅したらTRUE
 */
bool vanish_summoned_children(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        if ((m_ptr->parent_m_idx == 0) || (target_ptr->current_floor_ptr->m_list[m_ptr->parent_m_idx].r_idx > 0))
                return FALSE;

        if (see_m)
        {
                GAME_TEXT m_name[MAX_NLEN];
                monster_desc(target_ptr, m_name, m_ptr, 0);
                msg_format(_("%sは消え去った！", "%^s disappears!"), m_name);
        }

        if (record_named_pet && is_pet(m_ptr) && m_ptr->nickname)
        {
                GAME_TEXT m_name[MAX_NLEN];
                monster_desc(target_ptr, m_name, m_ptr, MD_INDEF_VISIBLE);
                exe_write_diary(target_ptr, DIARY_NAMED_PET, RECORD_NAMED_PET_LOSE_PARENT, m_name);
        }

        delete_monster_idx(target_ptr, m_idx);
        return TRUE;
}


/*!
 * @brief 寝ているモンスターの起床を判定する
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @return なし
 */
void awake_monster(player_type *target_ptr, MONSTER_IDX m_idx)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (!MON_CSLEEP(m_ptr)) return;
        if (!(target_ptr->cursed & TRC_AGGRAVATE)) return;

        (void)set_monster_csleep(target_ptr, m_idx, 0);
        if (m_ptr->ml)
        {
                GAME_TEXT m_name[MAX_NLEN];
                monster_desc(target_ptr, m_name, m_ptr, 0);
                msg_format(_("%^sが目を覚ました。", "%^s wakes up."), m_name);
        }

        if (is_original_ap_and_seen(target_ptr, m_ptr) && (r_ptr->r_wake < MAX_UCHAR))
        {
                r_ptr->r_wake++;
        }
}


/*!
 * @brief モンスターの怒り状態を判定する (起こっていたら敵に回す)
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param see_m モンスターが視界内にいたらTRUE
 * @return なし
 */
void process_angar(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        bool gets_angry = FALSE;
        if (is_friendly(m_ptr) && (target_ptr->cursed & TRC_AGGRAVATE))
                gets_angry = TRUE;

        if (is_pet(m_ptr) && ((((r_ptr->flags1 & RF1_UNIQUE) || (r_ptr->flags7 & RF7_NAZGUL)) &&
                monster_has_hostile_align(target_ptr, NULL, 10, -10, r_ptr)) || (r_ptr->flagsr & RFR_RES_ALL)))
        {
                gets_angry = TRUE;
        }

        if (target_ptr->phase_out || !gets_angry) return;

        if (is_pet(m_ptr) || see_m)
        {
                GAME_TEXT m_name[MAX_NLEN];
                monster_desc(target_ptr, m_name, m_ptr, is_pet(m_ptr) ? MD_ASSUME_VISIBLE : 0);
                msg_format(_("%^sは突然敵にまわった！", "%^s suddenly becomes hostile!"), m_name);
        }

        set_hostile(target_ptr, m_ptr);
}


/*!
 * @brief 量子生物の量子的効果を実行する
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param see_m モンスターが視界内にいたらTRUE
 * @return モンスターが量子的効果により消滅したらTRUE
 */
bool process_quantum_effect(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if ((r_ptr->flags2 & RF2_QUANTUM) == 0) return FALSE;
        if (!randint0(2)) return FALSE;
        if (randint0((m_idx % 100) + 10)) return FALSE;

        bool can_disappear = (r_ptr->flags1 & RF1_UNIQUE) == 0;
        can_disappear &= (r_ptr->flags1 & RF1_QUESTOR) == 0;
        if (can_disappear)
        {
                vanish_nonunique(target_ptr, m_idx, see_m);
                return TRUE;
        }
        
        produce_quantum_effect(target_ptr, m_idx, see_m);
        return FALSE;
}


/*!
 * @brief ユニークでない量子生物を消滅させる
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param see_m モンスターが視界内にいたらTRUE
 * @return なし
 */
void vanish_nonunique(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        if (see_m)
        {
                GAME_TEXT m_name[MAX_NLEN];
                monster_desc(target_ptr, m_name, m_ptr, 0);
                msg_format(_("%sは消え去った！", "%^s disappears!"), m_name);
        }

        monster_death(target_ptr, m_idx, FALSE);
        delete_monster_idx(target_ptr, m_idx);
        if (is_pet(m_ptr) && !(m_ptr->ml))
        {
                msg_print(_("少しの間悲しい気分になった。", "You feel sad for a moment."));
        }
}


/*!
 * @brief 量子生物ユニークの量子的効果 (ショート・テレポートまたは距離10のテレポート・アウェイ)を実行する
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param see_m モンスターが視界内にいたらTRUE
 * @return なし
 * @details
 * プレーヤーが量子生物を観測しているか、量子生物がプレーヤーを観測している場合、互いの相対的な位置を確定させる
 * 波動関数の収縮はテレポートではないので反テレポート無効
 * todo パターンは収縮どころか拡散しているが、この際気にしてはいけない
 */
void produce_quantum_effect(player_type *target_ptr, MONSTER_IDX m_idx, bool see_m)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        bool coherent = los(target_ptr, m_ptr->fy, m_ptr->fx, target_ptr->y, target_ptr->x);
        if (!see_m && !coherent) return;

        if (see_m)
        {
                GAME_TEXT m_name[MAX_NLEN];
                monster_desc(target_ptr, m_name, m_ptr, 0);
                msg_format(_("%sは量子的効果を起こした！", "%^s produced a decoherence!"), m_name);
        }
        else
        {
                msg_print(_("量子的効果が起こった！", "A decoherence was produced!"));
        }

        bool target = one_in_(2);
        const int blink = 32 * 5 + 4;
        if (target)
        {
                (void)monspell_to_monster(target_ptr, blink, m_ptr->fy, m_ptr->fx, m_idx, m_idx);

        }
        else
        {
                teleport_player_away(m_idx, target_ptr, 10, TRUE);
        }
}


/*!
 * @brief モンスター依存の特別な行動を取らせる
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 */
void process_special(player_type *target_ptr, MONSTER_IDX m_idx)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if ((r_ptr->a_ability_flags2 & RF6_SPECIAL) == 0) return;
        if (m_ptr->r_idx != MON_OHMU) return;
        if (target_ptr->current_floor_ptr->inside_arena || target_ptr->phase_out) return;
        if ((r_ptr->freq_spell == 0) || !(randint1(100) <= r_ptr->freq_spell)) return;

        int count = 0;
        DEPTH rlev = ((r_ptr->level >= 1) ? r_ptr->level : 1);
        BIT_FLAGS p_mode = is_pet(m_ptr) ? PM_FORCE_PET : 0L;

        for (int k = 0; k < A_MAX; k++)
        {
                if (summon_specific(target_ptr, m_idx, m_ptr->fy, m_ptr->fx, rlev, SUMMON_MOLD, (PM_ALLOW_GROUP | p_mode)))
                {
                        if (target_ptr->current_floor_ptr->m_list[hack_m_idx_ii].ml) count++;
                }
        }

        if (count && is_original_ap_and_seen(target_ptr, m_ptr)) r_ptr->r_flags6 |= (RF6_SPECIAL);
}


/*!
 * @brief モンスターを喋らせたり足音を立てたりする
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param oy モンスターが元々いたY座標
 * @param ox モンスターが元々いたX座標
 * @param aware 起きていればTRUE
 * @return なし
 */
void process_speak_sound(player_type *target_ptr, MONSTER_IDX m_idx, POSITION oy, POSITION ox, bool aware)
{
        if (target_ptr->phase_out) return;

        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *ap_r_ptr = &r_info[m_ptr->ap_r_idx];
        if (m_ptr->ap_r_idx == MON_CYBER &&
                one_in_(CYBERNOISE) &&
                !m_ptr->ml && (m_ptr->cdis <= MAX_SIGHT))
        {
                if (disturb_minor) disturb(target_ptr, FALSE, FALSE);
                msg_print(_("重厚な足音が聞こえた。", "You hear heavy steps."));
        }

        if (((ap_r_ptr->flags2 & RF2_CAN_SPEAK) == 0) || !aware ||
                !one_in_(SPEAK_CHANCE) ||
                !player_has_los_bold(target_ptr, oy, ox) ||
                !projectable(target_ptr, oy, ox, target_ptr->y, target_ptr->x))
                return;

        GAME_TEXT m_name[MAX_NLEN];
        char monmessage[1024];
        concptr filename;

        if (m_ptr->ml)
                monster_desc(target_ptr, m_name, m_ptr, 0);
        else
                strcpy(m_name, _("それ", "It"));

        if (MON_MONFEAR(m_ptr))
                filename = _("monfear_j.txt", "monfear.txt");
        else if (is_pet(m_ptr))
                filename = _("monpet_j.txt", "monpet.txt");
        else if (is_friendly(m_ptr))
                filename = _("monfrien_j.txt", "monfrien.txt");
        else
                filename = _("monspeak_j.txt", "monspeak.txt");

        if (get_rnd_line(filename, m_ptr->ap_r_idx, monmessage) == 0)
        {
                msg_format(_("%^s%s", "%^s %s"), m_name, monmessage);
        }
}


/*!
 * @brief モンスターを分裂させるかどうかを決定する (分裂もさせる)
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param oy 分裂元モンスターのY座標
 * @param ox 分裂元モンスターのX座標
 * @return 実際に分裂したらTRUEを返す
 */
bool decide_monster_multiplication(player_type *target_ptr, MONSTER_IDX m_idx, POSITION oy, POSITION ox)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (((r_ptr->flags2 & RF2_MULTIPLY) == 0) || (target_ptr->current_floor_ptr->num_repro >= MAX_REPRO))
                return FALSE;

        int k = 0;
        for (POSITION y = oy - 1; y <= oy + 1; y++)
        {
                for (POSITION x = ox - 1; x <= ox + 1; x++)
                {
                        if (!in_bounds2(target_ptr->current_floor_ptr, y, x)) continue;
                        if (target_ptr->current_floor_ptr->grid_array[y][x].m_idx) k++;
                }
        }

        if (multiply_barrier(target_ptr, m_idx)) k = 8;

        if ((k < 4) && (!k || !randint0(k * MON_MULT_ADJ)))
        {
                if (multiply_monster(target_ptr, m_idx, FALSE, (is_pet(m_ptr) ? PM_FORCE_PET : 0)))
                {
                        if (target_ptr->current_floor_ptr->m_list[hack_m_idx_ii].ml && is_original_ap_and_seen(target_ptr, m_ptr))
                        {
                                r_ptr->r_flags2 |= (RF2_MULTIPLY);
                        }

                        return TRUE;
                }
        }

        return FALSE;
}


/*!
 * @brief モンスターの移動パターンを決定する
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param mm 移動方向
 * @param m_idx モンスターID
 * @param aware 起きていればTRUE
 * @return 移動先が存在すればTRUE
 */
bool decide_monster_movement_direction(player_type *target_ptr, DIRECTION *mm, MONSTER_IDX m_idx, bool aware)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];

        if (MON_CONFUSED(m_ptr) || !aware)
        {
                mm[0] = mm[1] = mm[2] = mm[3] = 5;
                return TRUE;
        }

        if (((r_ptr->flags1 & (RF1_RAND_50 | RF1_RAND_25)) == (RF1_RAND_50 | RF1_RAND_25)) && (randint0(100) < 75))
        {
                if (is_original_ap_and_seen(target_ptr, m_ptr)) r_ptr->r_flags1 |= (RF1_RAND_50 | RF1_RAND_25);

                mm[0] = mm[1] = mm[2] = mm[3] = 5;
                return TRUE;
        }

        if ((r_ptr->flags1 & RF1_RAND_50) && (randint0(100) < 50))
        {
                if (is_original_ap_and_seen(target_ptr, m_ptr)) r_ptr->r_flags1 |= (RF1_RAND_50);

                mm[0] = mm[1] = mm[2] = mm[3] = 5;
                return TRUE;
        }

         if ((r_ptr->flags1 & RF1_RAND_25) && (randint0(100) < 25))
         {
                if (is_original_ap_and_seen(target_ptr, m_ptr)) r_ptr->r_flags1 |= RF1_RAND_25;

                mm[0] = mm[1] = mm[2] = mm[3] = 5;
                return TRUE;
         }

        if ((r_ptr->flags1 & RF1_NEVER_MOVE) && (m_ptr->cdis > 1))
        {
                mm[0] = mm[1] = mm[2] = mm[3] = 5;
                return TRUE;
        }

        if (is_pet(m_ptr))
        {
                bool avoid = ((target_ptr->pet_follow_distance < 0) && (m_ptr->cdis <= (0 - target_ptr->pet_follow_distance)));
                bool lonely = (!avoid && (m_ptr->cdis > target_ptr->pet_follow_distance));
                bool distant = (m_ptr->cdis > PET_SEEK_DIST);
                mm[0] = mm[1] = mm[2] = mm[3] = 5;
                if (!get_enemy_dir(target_ptr, m_idx, mm))
                {
                        if (avoid || lonely || distant)
                        {
                                POSITION dis = target_ptr->pet_follow_distance;
                                if (target_ptr->pet_follow_distance > PET_SEEK_DIST)
                                {
                                        target_ptr->pet_follow_distance = PET_SEEK_DIST;
                                }

                                (void)get_moves(target_ptr, m_idx, mm);
                                target_ptr->pet_follow_distance = (s16b)dis;
                        }
                }

                return TRUE;
        }

        if (!is_hostile(m_ptr))
        {
                mm[0] = mm[1] = mm[2] = mm[3] = 5;
                get_enemy_dir(target_ptr, m_idx, mm);
                return TRUE;
        }

        if (!get_moves(target_ptr, m_idx, mm)) return FALSE;

        return TRUE;
}


/*!
 * @brief ペットや友好的なモンスターがフロアから逃げる処理を行う
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param is_riding_mon 騎乗状態ならばTRUE
 * @param see_m モンスターが視界内にいたらTRUE
 * @return モンスターがフロアから消えたらTRUE
 */
bool runaway_monster(player_type *target_ptr, MONSTER_IDX m_idx, bool is_riding_mon, bool see_m)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        bool can_runaway = is_pet(m_ptr) || is_friendly(m_ptr);
        can_runaway &= ((r_ptr->flags1 & RF1_UNIQUE) != 0) || ((r_ptr->flags7 & RF7_NAZGUL) != 0);
        can_runaway &= !target_ptr->phase_out;
        if (!can_runaway) return FALSE;

        static int riding_pinch = 0;

        if (m_ptr->hp >= m_ptr->maxhp / 3)
        {
                /* Reset the counter */
                if (is_riding_mon) riding_pinch = 0;
                
                return FALSE;
        }

        GAME_TEXT m_name[MAX_NLEN];
        monster_desc(target_ptr, m_name, m_ptr, 0);
        if (is_riding_mon && riding_pinch < 2)
        {
                msg_format(_("%sは傷の痛さの余りあなたの束縛から逃れようとしている。",
                        "%^s seems to be in so much pain and tries to escape from your restriction."), m_name);
                riding_pinch++;
                disturb(target_ptr, TRUE, TRUE);
                return FALSE;
        }

        if (is_riding_mon)
        {
                msg_format(_("%sはあなたの束縛から脱出した。", "%^s succeeded to escape from your restriction!"), m_name);
                if (rakuba(target_ptr, -1, FALSE))
                {
                        msg_print(_("地面に落とされた。", "You have fallen from the pet you were riding."));
                }
        }

        if (see_m)
        {
                if ((r_ptr->flags2 & RF2_CAN_SPEAK) && (m_ptr->r_idx != MON_GRIP) && (m_ptr->r_idx != MON_WOLF) && (m_ptr->r_idx != MON_FANG) &&
                        player_has_los_bold(target_ptr, m_ptr->fy, m_ptr->fx) && projectable(target_ptr, m_ptr->fy, m_ptr->fx, target_ptr->y, target_ptr->x))
                {
                        msg_format(_("%^s「ピンチだ！退却させてもらう！」", "%^s says 'It is the pinch! I will retreat'."), m_name);
                }

                msg_format(_("%^sがテレポート・レベルの巻物を読んだ。", "%^s reads a scroll of teleport level."), m_name);
                msg_format(_("%^sが消え去った。", "%^s disappears."), m_name);
        }

        if (is_riding_mon && rakuba(target_ptr, -1, FALSE))
        {
                msg_print(_("地面に落とされた。", "You have fallen from the pet you were riding."));
        }

        check_quest_completion(target_ptr, m_ptr);
        delete_monster_idx(target_ptr, m_idx);
        return TRUE;
}


/*!
 * @brief モンスターに魔法を試行させる
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param aware 起きていればTRUE
 * @return 魔法を唱えられなければ強制的にFALSE、その後モンスターが実際に魔法を唱えればTRUE
 */
bool cast_spell(player_type *target_ptr, MONSTER_IDX m_idx, bool aware)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if ((r_ptr->freq_spell == 0) || (randint1(100) > r_ptr->freq_spell))
                return FALSE;

        bool counterattack = FALSE;
        if (m_ptr->target_y)
        {
                MONSTER_IDX t_m_idx = target_ptr->current_floor_ptr->grid_array[m_ptr->target_y][m_ptr->target_x].m_idx;
                if (t_m_idx && are_enemies(target_ptr, m_ptr, &target_ptr->current_floor_ptr->m_list[t_m_idx]) &&
                        projectable(target_ptr, m_ptr->fy, m_ptr->fx, m_ptr->target_y, m_ptr->target_x))
                {
                        counterattack = TRUE;
                }
        }

        if (counterattack)
        {
                if (monst_spell_monst(target_ptr, m_idx)) return TRUE;
                if (aware && make_attack_spell(m_idx, target_ptr)) return TRUE;
        }
        else
        {
                if (aware && make_attack_spell(m_idx, target_ptr)) return TRUE;
                if (monst_spell_monst(target_ptr, m_idx)) return TRUE;
        }

        return FALSE;
}


/*!
 * @brief モンスターによる壁の透過・破壊を行う
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_ptr モンスターへの参照ポインタ
 * @param ny モンスターのY座標
 * @param nx モンスターのX座標
 * @param can_cross モンスターが地形を踏破できるならばTRUE
 * @return 透過も破壊もしなかった場合はFALSE、それ以外はTRUE
 */
bool process_wall(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx, bool can_cross)
{
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        grid_type *g_ptr;
        g_ptr = &target_ptr->current_floor_ptr->grid_array[ny][nx];
        feature_type *f_ptr;
        f_ptr = &f_info[g_ptr->feat];
        if (player_bold(target_ptr, ny, nx))
        {
                turn_flags_ptr->do_move = TRUE;
                return TRUE;
        }

        if (g_ptr->m_idx > 0)
        {
                turn_flags_ptr->do_move = TRUE;
                return TRUE;
        }
        
        if (((r_ptr->flags2 & RF2_KILL_WALL) != 0) &&
                (can_cross ? !have_flag(f_ptr->flags, FF_LOS) : !turn_flags_ptr->is_riding_mon) &&
                have_flag(f_ptr->flags, FF_HURT_DISI) && !have_flag(f_ptr->flags, FF_PERMANENT) &&
                check_hp_for_feat_destruction(f_ptr, m_ptr))
        {
                turn_flags_ptr->do_move = TRUE;
                if (!can_cross) turn_flags_ptr->must_alter_to_move = TRUE;

                turn_flags_ptr->did_kill_wall = TRUE;
                return TRUE;
        }
        
        if (!can_cross) return FALSE;

        turn_flags_ptr->do_move = TRUE;
        if (((r_ptr->flags2 & RF2_PASS_WALL) != 0) && (!turn_flags_ptr->is_riding_mon || target_ptr->pass_wall) &&
                have_flag(f_ptr->flags, FF_CAN_PASS))
        {
                turn_flags_ptr->did_pass_wall = TRUE;
        }

        return TRUE;
}


/*!
 * @brief モンスターによるドアの開放・破壊を行う
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param turn_flags_ptr ターン経過処理フラグへの参照ポインタ
 * @param m_ptr モンスターへの参照ポインタ
 * @param ny モンスターのY座標
 * @param nx モンスターのX座標
 * @return モンスターIDが異常でない限りTRUE
 */
bool process_door(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx)
{
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        grid_type *g_ptr;
        g_ptr = &target_ptr->current_floor_ptr->grid_array[ny][nx];
        if (!is_closed_door(target_ptr, g_ptr->feat)) return TRUE;

        feature_type *f_ptr;
        f_ptr = &f_info[g_ptr->feat];
        bool may_bash = bash_normal_door(target_ptr, turn_flags_ptr, m_ptr, ny, nx);
        bash_glass_door(target_ptr, turn_flags_ptr, m_ptr, f_ptr, may_bash);

        if (!turn_flags_ptr->did_open_door && !turn_flags_ptr->did_bash_door) return TRUE;

        if (turn_flags_ptr->did_bash_door && 
                ((randint0(100) < 50) || (feat_state(target_ptr, g_ptr->feat, FF_OPEN) == g_ptr->feat) || have_flag(f_ptr->flags, FF_GLASS)))
        {
                cave_alter_feat(target_ptr, ny, nx, FF_BASH);
                if (!monster_is_valid(m_ptr))
                {
                        target_ptr->update |= (PU_FLOW);
                        target_ptr->window |= (PW_OVERHEAD | PW_DUNGEON);
                        if (is_original_ap_and_seen(target_ptr, m_ptr)) r_ptr->r_flags2 |= (RF2_BASH_DOOR);

                        return FALSE;
                }
        }
        else
        {
                cave_alter_feat(target_ptr, ny, nx, FF_OPEN);
        }

        f_ptr = &f_info[g_ptr->feat];
        turn_flags_ptr->do_view = TRUE;
        return TRUE;
}


/*!
 * @brief モンスターが普通のドアを開ける処理
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param turn_flags_ptr ターン経過処理フラグへの参照ポインタ
 * @param m_ptr モンスターへの参照ポインタ
 * @param ny モンスターのY座標
 * @param nx モンスターのX座標
 * @return ここではドアを開けず、ガラスのドアを開ける可能性があるならTRUE
 */
bool bash_normal_door(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx)
{
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        grid_type *g_ptr;
        g_ptr = &target_ptr->current_floor_ptr->grid_array[ny][nx];
        feature_type *f_ptr;
        f_ptr = &f_info[g_ptr->feat];
        turn_flags_ptr->do_move = FALSE;
        if (((r_ptr->flags2 & RF2_OPEN_DOOR) == 0) || !have_flag(f_ptr->flags, FF_OPEN) ||
                (is_pet(m_ptr) && ((target_ptr->pet_extra_flags & PF_OPEN_DOORS) == 0)))
                return TRUE;

        if (f_ptr->power == 0)
        {
                turn_flags_ptr->did_open_door = TRUE;
                turn_flags_ptr->do_turn = TRUE;
                return FALSE;
        }

        if (randint0(m_ptr->hp / 10) > f_ptr->power)
        {
                cave_alter_feat(target_ptr, ny, nx, FF_DISARM);
                turn_flags_ptr->do_turn = TRUE;
                return FALSE;
        }

        return TRUE;
}


/*!
 * @brief モンスターがガラスのドアを開ける処理
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param turn_flags_ptr ターン経過処理フラグへの参照ポインタ
 * @param m_ptr モンスターへの参照ポインタ
 * @param g_ptr グリッドへの参照ポインタ
 * @param f_ptr 地形への参照ポインタ
 * @return なし
 */
void bash_glass_door(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, feature_type *f_ptr, bool may_bash)
{
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (!may_bash || ((r_ptr->flags2 & RF2_BASH_DOOR) == 0) || !have_flag(f_ptr->flags, FF_BASH) ||
                (is_pet(m_ptr) && ((target_ptr->pet_extra_flags & PF_OPEN_DOORS) == 0)))
                return;

        if (!check_hp_for_feat_destruction(f_ptr, m_ptr) || (randint0(m_ptr->hp / 10) <= f_ptr->power))
                return;

        if (have_flag(f_ptr->flags, FF_GLASS))
                msg_print(_("ガラスが砕ける音がした！", "You hear glass breaking!"));
        else
                msg_print(_("ドアを叩き開ける音がした！", "You hear a door burst open!"));

        if (disturb_minor) disturb(target_ptr, FALSE, FALSE);

        turn_flags_ptr->did_bash_door = TRUE;
        turn_flags_ptr->do_move = TRUE;
        turn_flags_ptr->must_alter_to_move = TRUE;
}


/*!
 * @brief 守りのルーンによるモンスターの移動制限を処理する
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param turn_flags_ptr ターン経過処理フラグへの参照ポインタ
 * @param m_ptr モンスターへの参照ポインタ
 * @param ny モンスターのY座標
 * @param nx モンスターのX座標
 * @return ルーンのある/なし
 */
bool process_protection_rune(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx)
{
        grid_type *g_ptr;
        g_ptr = &target_ptr->current_floor_ptr->grid_array[ny][nx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (!turn_flags_ptr->do_move || !is_glyph_grid(g_ptr) ||
                (((r_ptr->flags1 & RF1_NEVER_BLOW) != 0) && player_bold(target_ptr, ny, nx)))
                return FALSE;

        turn_flags_ptr->do_move = FALSE;
        if (is_pet(m_ptr) || (randint1(BREAK_GLYPH) >= r_ptr->level))
                return TRUE;

        if (g_ptr->info & CAVE_MARK)
        {
                msg_print(_("守りのルーンが壊れた！", "The rune of protection is broken!"));
        }

        g_ptr->info &= ~(CAVE_MARK);
        g_ptr->info &= ~(CAVE_OBJECT);
        g_ptr->mimic = 0;
        turn_flags_ptr->do_move = TRUE;
        note_spot(target_ptr, ny, nx);
        return TRUE;
}


/*!
 * @brief 爆発のルーンにを処理する
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param turn_flags_ptr ターン経過処理フラグへの参照ポインタ
 * @param m_ptr モンスターへの参照ポインタ
 * @param ny モンスターのY座標
 * @param nx モンスターのX座標
 * @return モンスター情報が異常でない限りTRUE
 */
bool process_explosive_rune(player_type *target_ptr, turn_flags *turn_flags_ptr, monster_type *m_ptr, POSITION ny, POSITION nx)
{
        grid_type *g_ptr;
        g_ptr = &target_ptr->current_floor_ptr->grid_array[ny][nx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (!turn_flags_ptr->do_move || !is_explosive_rune_grid(g_ptr) ||
                (((r_ptr->flags1 & RF1_NEVER_BLOW) != 0) && player_bold(target_ptr, ny, nx)))
                return TRUE;

        turn_flags_ptr->do_move = FALSE;
        if (is_pet(m_ptr)) return TRUE;

        if (randint1(BREAK_MINOR_GLYPH) > r_ptr->level)
        {
                if (g_ptr->info & CAVE_MARK)
                {
                        msg_print(_("ルーンが爆発した！", "The rune explodes!"));
                        BIT_FLAGS project_flags = PROJECT_GRID | PROJECT_ITEM | PROJECT_KILL | PROJECT_JUMP | PROJECT_NO_HANGEKI;
                        project(target_ptr, 0, 2, ny, nx, 2 * (target_ptr->lev + damroll(7, 7)), GF_MANA, project_flags, -1);
                }
        }
        else
        {
                msg_print(_("爆発のルーンは解除された。", "An explosive rune was disarmed."));
        }

        g_ptr->info &= ~(CAVE_MARK);
        g_ptr->info &= ~(CAVE_OBJECT);
        g_ptr->mimic = 0;

        note_spot(target_ptr, ny, nx);
        lite_spot(target_ptr, ny, nx);

        if (!monster_is_valid(m_ptr)) return FALSE;

        turn_flags_ptr->do_move = TRUE;
        return TRUE;
}


/*!
 * @brief モンスターが移動した結果、そこにプレーヤーがいたら直接攻撃を行う
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param turn_flags_ptr ターン経過処理フラグへの参照ポインタ
 * @param m_idx モンスターID
 * @param ny モンスターのY座標
 * @param nx モンスターのX座標
 * @return なし
 * @details
 * 反攻撃の洞窟など、直接攻撃ができない場所では処理をスキップする
 */
void exe_monster_attack_to_player(player_type *target_ptr, turn_flags *turn_flags_ptr, MONSTER_IDX m_idx, POSITION ny, POSITION nx)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (!turn_flags_ptr->do_move || !player_bold(target_ptr, ny, nx))
                return;

        if (r_ptr->flags1 & RF1_NEVER_BLOW)
        {
                if (is_original_ap_and_seen(target_ptr, m_ptr))
                        r_ptr->r_flags1 |= (RF1_NEVER_BLOW);

                turn_flags_ptr->do_move = FALSE;
        }

        if (turn_flags_ptr->do_move && ((d_info[target_ptr->dungeon_idx].flags1 & DF1_NO_MELEE) != 0) && !MON_CONFUSED(m_ptr))
        {
                if (!(r_ptr->flags2 & RF2_STUPID))
                        turn_flags_ptr->do_move = FALSE;
                else if (is_original_ap_and_seen(target_ptr, m_ptr))
                        r_ptr->r_flags2 |= (RF2_STUPID);
        }

        if (!turn_flags_ptr->do_move) return;

        if (!target_ptr->riding || one_in_(2))
        {
                (void)make_attack_normal(target_ptr, m_idx);
                turn_flags_ptr->do_move = FALSE;
                turn_flags_ptr->do_turn = TRUE;
        }
}


/*!
 * @brief モンスターからモンスターへの攻撃処理
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param turn_flags_ptr ターン経過処理フラグへの参照ポインタ
 * @param m_idx モンスターID
 * @param g_ptr グリッドへの参照ポインタ
 * @param can_cross モンスターが地形を踏破できるならばTRUE
 * @return ターン消費が発生したらTRUE
 */
bool process_monster_attack_to_monster(player_type *target_ptr, turn_flags *turn_flags_ptr, MONSTER_IDX m_idx, grid_type *g_ptr, bool can_cross)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        monster_type *y_ptr;
        y_ptr = &target_ptr->current_floor_ptr->m_list[g_ptr->m_idx];
        if (!turn_flags_ptr->do_move || (g_ptr->m_idx == 0)) return FALSE;

        monster_race *z_ptr = &r_info[y_ptr->r_idx];
        turn_flags_ptr->do_move = FALSE;
        if ((((r_ptr->flags2 & RF2_KILL_BODY) != 0) && ((r_ptr->flags1 & RF1_NEVER_BLOW) == 0) &&
                (r_ptr->mexp * r_ptr->level > z_ptr->mexp * z_ptr->level) &&
                can_cross && (g_ptr->m_idx != target_ptr->riding)) ||
                are_enemies(target_ptr, m_ptr, y_ptr) || MON_CONFUSED(m_ptr))
        {
                return exe_monster_attack_to_monster(target_ptr, m_idx, g_ptr);
        }

        if (((r_ptr->flags2 & RF2_MOVE_BODY) != 0) && ((r_ptr->flags1 & RF1_NEVER_MOVE) == 0) &&
                (r_ptr->mexp > z_ptr->mexp) &&
                can_cross && (g_ptr->m_idx != target_ptr->riding) &&
                monster_can_cross_terrain(target_ptr, target_ptr->current_floor_ptr->grid_array[m_ptr->fy][m_ptr->fx].feat, z_ptr, 0))
        {
                turn_flags_ptr->do_move = TRUE;
                turn_flags_ptr->did_move_body = TRUE;
                (void)set_monster_csleep(target_ptr, g_ptr->m_idx, 0);
        }

        return FALSE;
}


/*!
 * @brief モンスターからモンスターへの直接攻撃を実行する
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターID
 * @param g_ptr グリッドへの参照ポインタ
 */
bool exe_monster_attack_to_monster(player_type *target_ptr, MONSTER_IDX m_idx, grid_type *g_ptr)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        monster_type *y_ptr;
        y_ptr = &target_ptr->current_floor_ptr->m_list[g_ptr->m_idx];
        if ((r_ptr->flags1 & RF1_NEVER_BLOW) != 0) return FALSE;

        if (((r_ptr->flags2 & RF2_KILL_BODY) == 0) && is_original_ap_and_seen(target_ptr, m_ptr))
                r_ptr->r_flags2 |= (RF2_KILL_BODY);

        if ((y_ptr->r_idx == 0) || (y_ptr->hp < 0)) return FALSE;
        if (monst_attack_monst(target_ptr, m_idx, g_ptr->m_idx)) return TRUE;
        if ((d_info[target_ptr->dungeon_idx].flags1 & DF1_NO_MELEE) == 0) return FALSE;
        if (MON_CONFUSED(m_ptr)) return TRUE;
        if ((r_ptr->flags2 & RF2_STUPID) == 0) return FALSE;

        if (is_original_ap_and_seen(target_ptr, m_ptr))
                r_ptr->r_flags2 |= (RF2_STUPID);

        return TRUE;
}


/*!
 * @brief 全モンスターのターン管理メインルーチン /
 * Process all the "live" monsters, once per game turn.
 * @return なし
 * @details
 * During each game current game turn, we scan through the list of all the "live" monsters,\n
 * (backwards, so we can excise any "freshly dead" monsters), energizing each\n
 * monster, and allowing fully energized monsters to move, attack, pass, etc.\n
 *\n
 * Note that monsters can never move in the monster array (except when the\n
 * "compact_monsters()" function is called by "dungeon()" or "save_player()").\n
 *\n
 * This function is responsible for at least half of the processor time\n
 * on a normal system with a "normal" amount of monsters and a player doing\n
 * normal things.\n
 *\n
 * When the player is resting, virtually 90% of the processor time is spent\n
 * in this function, and its children, "process_monster()" and "make_move()".\n
 *\n
 * Most of the rest of the time is spent in "update_view()" and "lite_spot()",\n
 * especially when the player is running.\n
 *\n
 * Note the special "MFLAG_BORN" flag, which allows us to ignore "fresh"\n
 * monsters while they are still being "born".  A monster is "fresh" only\n
 * during the game turn in which it is created, and we use the "hack_m_idx" to\n
 * determine if the monster is yet to be processed during the game turn.\n
 *\n
 * Note the special "MFLAG_NICE" flag, which allows the player to get one\n
 * move before any "nasty" monsters get to use their spell attacks.\n
 *\n
 * Note that when the "knowledge" about the currently tracked monster\n
 * changes (flags, attacks, spells), we induce a redraw of the monster\n
 * recall window.\n
 */
void process_monsters(player_type *target_ptr)
{
        BIT_FLAGS old_r_flags1 = 0L;
        BIT_FLAGS old_r_flags2 = 0L;
        BIT_FLAGS old_r_flags3 = 0L;
        BIT_FLAGS old_r_flags4 = 0L;
        BIT_FLAGS old_r_flags5 = 0L;
        BIT_FLAGS old_r_flags6 = 0L;
        BIT_FLAGS old_r_flagsr = 0L;

        byte old_r_blows0 = 0;
        byte old_r_blows1 = 0;
        byte old_r_blows2 = 0;
        byte old_r_blows3 = 0;

        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        floor_ptr->monster_noise = FALSE;

        MONRACE_IDX old_monster_race_idx = target_ptr->monster_race_idx;
        byte old_r_cast_spell = 0;
        if (target_ptr->monster_race_idx)
        {
                monster_race *r_ptr;
                r_ptr = &r_info[target_ptr->monster_race_idx];

                old_r_flags1 = r_ptr->r_flags1;
                old_r_flags2 = r_ptr->r_flags2;
                old_r_flags3 = r_ptr->r_flags3;
                old_r_flags4 = r_ptr->r_flags4;
                old_r_flags5 = r_ptr->r_flags5;
                old_r_flags6 = r_ptr->r_flags6;
                old_r_flagsr = r_ptr->r_flagsr;

                old_r_blows0 = r_ptr->r_blows[0];
                old_r_blows1 = r_ptr->r_blows[1];
                old_r_blows2 = r_ptr->r_blows[2];
                old_r_blows3 = r_ptr->r_blows[3];

                old_r_cast_spell = r_ptr->r_cast_spell;
        }

        for (MONSTER_IDX i = floor_ptr->m_max - 1; i >= 1; i--)
        {
                monster_type *m_ptr;
                monster_race *r_ptr;
                m_ptr = &floor_ptr->m_list[i];
                r_ptr = &r_info[m_ptr->r_idx];

                if (target_ptr->leaving) break;
                if (!monster_is_valid(m_ptr)) continue;
                if (target_ptr->wild_mode) continue;

                if (m_ptr->mflag & MFLAG_BORN)
                {
                        m_ptr->mflag &= ~(MFLAG_BORN);
                        continue;
                }

                if (m_ptr->cdis >= AAF_LIMIT) continue;

                POSITION fx = m_ptr->fx;
                POSITION fy = m_ptr->fy;
                if (!target_ptr->no_flowed)
                {
                        m_ptr->mflag2 &= ~MFLAG2_NOFLOW;
                }

                bool test = FALSE;
                if (m_ptr->cdis <= (is_pet(m_ptr) ? (r_ptr->aaf > MAX_SIGHT ? MAX_SIGHT : r_ptr->aaf) : r_ptr->aaf))
                {
                        test = TRUE;
                }
                else if ((m_ptr->cdis <= MAX_SIGHT || target_ptr->phase_out) &&
                        (player_has_los_bold(target_ptr, fy, fx) || (target_ptr->cursed & TRC_AGGRAVATE)))
                {
                        test = TRUE;
                }
                else if (m_ptr->target_y)
                {
                        test = TRUE;
                }

                if (!test) continue;

                SPEED speed;
                if (target_ptr->riding == i)
                {
                        speed = target_ptr->pspeed;
                }
                else
                {
                        speed = m_ptr->mspeed;
                        if (ironman_nightmare) speed += 5;

                        if (MON_FAST(m_ptr)) speed += 10;
                        if (MON_SLOW(m_ptr)) speed -= 10;
                }

                m_ptr->energy_need -= SPEED_TO_ENERGY(speed);
                if (m_ptr->energy_need > 0) continue;

                m_ptr->energy_need += ENERGY_NEED();
                hack_m_idx = i;
                process_monster(target_ptr, i);
                reset_target(m_ptr);

                if (target_ptr->no_flowed && one_in_(3))
                        m_ptr->mflag2 |= MFLAG2_NOFLOW;

                if (!target_ptr->playing || target_ptr->is_dead) break;
                if (target_ptr->leaving) break;
        }

        hack_m_idx = 0;
        if (!target_ptr->monster_race_idx || (target_ptr->monster_race_idx != old_monster_race_idx))
                return;

        monster_race *r_ptr;
        r_ptr = &r_info[target_ptr->monster_race_idx];

        if ((old_r_flags1 != r_ptr->r_flags1) ||
                (old_r_flags2 != r_ptr->r_flags2) ||
                (old_r_flags3 != r_ptr->r_flags3) ||
                (old_r_flags4 != r_ptr->r_flags4) ||
                (old_r_flags5 != r_ptr->r_flags5) ||
                (old_r_flags6 != r_ptr->r_flags6) ||
                (old_r_flagsr != r_ptr->r_flagsr) ||
                (old_r_blows0 != r_ptr->r_blows[0]) ||
                (old_r_blows1 != r_ptr->r_blows[1]) ||
                (old_r_blows2 != r_ptr->r_blows[2]) ||
                (old_r_blows3 != r_ptr->r_blows[3]) ||
                (old_r_cast_spell != r_ptr->r_cast_spell))
        {
                target_ptr->window |= (PW_MONSTER);
        }
}