root/src/map/unit.c @ 23

// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
// For more information, see LICENCE in the main folder

#include "../common/showmsg.h"
#include "../common/timer.h"
#include "../common/nullpo.h"
#include "../common/db.h"
#include "../common/malloc.h"
#include "unit.h"
#include "map.h"
#include "path.h"
#include "pc.h"
#include "mob.h"
#include "pet.h"
#include "mercenary.h"
#include "skill.h"
#include "clif.h"
#include "npc.h"
#include "guild.h"
#include "status.h"
#include "battle.h"
#include "chat.h"
#include "trade.h"
#include "vending.h"
#include "party.h"
#include "intif.h"
#include "chrif.h"
#include "script.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


const short dirx[8]={0,-1,-1,-1,0,1,1,1};
const short diry[8]={1,1,0,-1,-1,-1,0,1};

struct unit_data* unit_bl2ud(struct block_list *bl)
{
        if( bl == NULL) return NULL;
        if( bl->type == BL_PC)  return &((struct map_session_data*)bl)->ud;
        if( bl->type == BL_MOB) return &((struct mob_data*)bl)->ud;
        if( bl->type == BL_PET) return &((struct pet_data*)bl)->ud;
        if( bl->type == BL_NPC) return &((struct npc_data*)bl)->ud;
        if( bl->type == BL_HOM) return &((struct homun_data*)bl)->ud;   //[orn]
        return NULL;
}

static int unit_attack_timer(int tid, unsigned int tick, int id, intptr data);
static int unit_walktoxy_timer(int tid, unsigned int tick, int id, intptr data);

int unit_walktoxy_sub(struct block_list *bl)
{
        int i;
        struct walkpath_data wpd;
        struct unit_data *ud = NULL;

        nullpo_retr(1, bl);
        ud = unit_bl2ud(bl);
        if(ud == NULL) return 0;

        if( !path_search(&wpd,bl->m,bl->x,bl->y,ud->to_x,ud->to_y,ud->state.walk_easy,CELL_CHKNOPASS) )
                return 0;

        memcpy(&ud->walkpath,&wpd,sizeof(wpd));
        
        if (ud->target && ud->chaserange>1) {
                //Generally speaking, the walk path is already to an adjacent tile
                //so we only need to shorten the path if the range is greater than 1.
                int dir;
                //Trim the last part of the path to account for range,
                //but always move at least one cell when requested to move.
                for (i = ud->chaserange*10; i > 0 && ud->walkpath.path_len>1;) {
                   ud->walkpath.path_len--;
                        dir = ud->walkpath.path[ud->walkpath.path_len];
                        if(dir&1)
                                i-=14;
                        else
                                i-=10;
                        ud->to_x -= dirx[dir];
                        ud->to_y -= diry[dir];
                }
        }

        ud->state.change_walk_target=0;

        if (bl->type == BL_PC) {
                ((TBL_PC *)bl)->head_dir = 0;
                clif_walkok((TBL_PC*)bl);
        }
        clif_move(ud);

        if(ud->walkpath.path_pos>=ud->walkpath.path_len)
                i = -1;
        else if(ud->walkpath.path[ud->walkpath.path_pos]&1)
                i = status_get_speed(bl)*14/10;
        else
                i = status_get_speed(bl);
        if( i > 0)
                ud->walktimer = add_timer(gettick()+i,unit_walktoxy_timer,bl->id,i);
        return 1;
}

static int unit_walktoxy_timer(int tid, unsigned int tick, int id, intptr data)
{
        int i;
        int x,y,dx,dy;
        uint8 dir;
        struct block_list       *bl;
        struct map_session_data *sd;
        struct mob_data         *md;
        struct unit_data        *ud;

        bl = map_id2bl(id);
        if(bl == NULL)
                return 0;
        sd = BL_CAST(BL_PC, bl);
        md = BL_CAST(BL_MOB, bl);
        ud = unit_bl2ud(bl);
        
        if(ud == NULL) return 0;

        if(ud->walktimer != tid){
                ShowError("unit_walk_timer mismatch %d != %d\n",ud->walktimer,tid);
                return 0;
        }
        ud->walktimer=-1;
        if( bl->prev == NULL ) return 0; // block_list ‚©‚甲‚¯‚Ä‚¢‚é‚̂ňړ®’âŽ~‚·‚é

        if(ud->walkpath.path_pos>=ud->walkpath.path_len)
                return 0;

        if(ud->walkpath.path[ud->walkpath.path_pos]>=8)
                return 1;
        x = bl->x;
        y = bl->y;

        dir = ud->walkpath.path[ud->walkpath.path_pos];
        ud->dir = dir;

        dx = dirx[(int)dir];
        dy = diry[(int)dir];

        if(map_getcell(bl->m,x+dx,y+dy,CELL_CHKNOPASS))
                return unit_walktoxy_sub(bl);
        
        // ƒoƒVƒŠƒJ”»’è

        map_foreachinmovearea(clif_outsight, bl, AREA_SIZE, dx, dy, sd?BL_ALL:BL_PC, bl);

        x += dx;
        y += dy;
        map_moveblock(bl, x, y, tick);
        ud->walk_count++; //walked cell counter, to be used for walk-triggered skills. [Skotlex]

        if (bl->x != x || bl->y != y || ud->walktimer != -1)
                return 0; //map_moveblock has altered the object beyond what we expected (moved/warped it)

        ud->walktimer = 1;
        map_foreachinmovearea(clif_insight, bl, AREA_SIZE, -dx, -dy, sd?BL_ALL:BL_PC, bl);
        ud->walktimer = -1;
        
        if(sd) {
                if(map_getcell(bl->m,x,y,CELL_CHKNPC)) {
                        npc_touch_areanpc(sd,bl->m,x,y);
                        if (bl->prev == NULL) //Script could have warped char, abort remaining of the function.
                                return 0;
                } else
                        sd->areanpc_id=0;
                if (sd->state.gmaster_flag &&
                        (battle_config.guild_aura&(agit_flag?2:1)) &&
                        (battle_config.guild_aura&(map_flag_gvg2(bl->m)?8:4))
                )
                { //Guild Aura: Likely needs to be recoded, this method seems inefficient.
                        struct guild *g = sd->state.gmaster_flag;
                        int skill, strvit= 0, agidex = 0;
                        if ((skill = guild_checkskill(g, GD_LEADERSHIP)) > 0) strvit |= (skill&0xFFFF)<<16;
                        if ((skill = guild_checkskill(g, GD_GLORYWOUNDS)) > 0) strvit |= (skill&0xFFFF);
                        if ((skill = guild_checkskill(g, GD_SOULCOLD)) > 0) agidex |= (skill&0xFFFF)<<16;
                        if ((skill = guild_checkskill(g, GD_HAWKEYES)) > 0) agidex |= skill&0xFFFF;
                        if (strvit || agidex)
                                map_foreachinrange(skill_guildaura_sub, bl,2, BL_PC,
                                        bl->id, sd->status.guild_id, strvit, agidex);
                }
        } else if (md) {
                if( map_getcell(bl->m,x,y,CELL_CHKNPC) ) {
                        if( npc_touch_areanpc2(md) ) return 0; // Warped
                } else
                        md->areanpc_id = 0;
                if (md->min_chase > md->db->range3) md->min_chase--;
                //Walk skills are triggered regardless of target due to the idle-walk mob state.
                //But avoid triggering on stop-walk calls.
                if(tid != -1 &&
                        !(ud->walk_count%WALK_SKILL_INTERVAL) &&
                        mobskill_use(md, tick, -1))
                {
                        if (!(ud->skillid == NPC_SELFDESTRUCTION && ud->skilltimer != -1))
                        {       //Skill used, abort walking
                                clif_fixpos(bl); //Fix position as walk has been cancelled.
                                return 0;
                        }
                        //Resend walk packet for proper Self Destruction display.
                        clif_move(ud);
                }
        }

        if(tid == -1) //A directly invoked timer is from battle_stop_walking, therefore the rest is irrelevant.
                return 0;
                
        if(ud->state.change_walk_target)
                return unit_walktoxy_sub(bl);

        ud->walkpath.path_pos++;
        if(ud->walkpath.path_pos>=ud->walkpath.path_len)
                i = -1;
        else if(ud->walkpath.path[ud->walkpath.path_pos]&1)
                i = status_get_speed(bl)*14/10;
        else
                i = status_get_speed(bl);

        if( md && map_getcell(bl->m,x,y,CELL_CHKBASILICA) ) {
                skill_blown(bl,bl,2,unit_getdir(bl),0);
                clif_fixpos(bl);
        }
        
        if(i > 0)
                ud->walktimer = add_timer(tick+i,unit_walktoxy_timer,id,i);
        else if(ud->state.running) {
                //Keep trying to run.
                if (!unit_run(bl))
                        ud->state.running = 0;
        }
        else if (ud->target) {
                //Update target trajectory.
                struct block_list *tbl = map_id2bl(ud->target);
                if (!tbl || !status_check_visibility(bl, tbl)) {        //Cancel chase.
                        ud->to_x = bl->x;
                        ud->to_y = bl->y;
                        if (tbl && bl->type == BL_MOB) //See if the mob can do a warp chase.
                                mob_warpchase((TBL_MOB*)bl, tbl);
                        return 0;
                }
                if (tbl->m == bl->m && check_distance_bl(bl, tbl, ud->chaserange))
                {       //Reached destination.
                        if (ud->state.attack_continue)
                        {       //Aegis uses one before every attack, we should
                                //only need this one for syncing purposes. [Skotlex]
                                clif_fixpos(bl);
                                unit_attack(bl, tbl->id, ud->state.attack_continue);
                        }
                } else { //Update chase-path
                        unit_walktobl(bl, tbl, ud->chaserange, ud->state.walk_easy|(ud->state.attack_continue?2:0));
                        return 0;
                }
        }
        else {  //Stopped walking. Update to_x and to_y to current location [Skotlex]
                ud->to_x = bl->x;
                ud->to_y = bl->y;
                if(md && md->nd) // Tell the script engine we've finished walking (for AI pathfinding)
                        mob_script_callback(md, NULL, CALLBACK_WALKACK);
        }
        return 0;
}

static int unit_delay_walktoxy_timer(int tid, unsigned int tick, int id, intptr data)
{
        struct block_list *bl = map_id2bl(id);

        if (!bl || bl->prev == NULL)
                return 0;
        unit_walktoxy(bl, (short)((data>>16)&0xffff), (short)(data&0xffff), 0);
        return 1;
}

//flag parameter:
//&1 -> 1/0 = easy/hard
//&2 -> force walking
//&4 -> Delay walking if the reason you can't walk is the canwalk delay
int unit_walktoxy( struct block_list *bl, short x, short y, int flag)
{
        struct unit_data* ud = NULL;
        struct status_change* sc = NULL;

        nullpo_retr(0, bl);
        
        ud = unit_bl2ud(bl);
        
        if( ud == NULL) return 0;

        if (flag&4 && DIFF_TICK(ud->canmove_tick, gettick()) > 0 &&
                DIFF_TICK(ud->canmove_tick, gettick()) < 2000)
        {       // Delay walking command. [Skotlex]
                add_timer(ud->canmove_tick+1, unit_delay_walktoxy_timer, bl->id, (x<<16)|(y&0xFFFF));
                return 1;
        }

        if(!(flag&2) && (!(status_get_mode(bl)&MD_CANMOVE) || !unit_can_move(bl)))
                return 0;
        
        ud->state.walk_easy = flag&1;
        ud->target = 0;
        ud->to_x = x;
        ud->to_y = y;
        
        sc = status_get_sc(bl);
        if (sc && sc->data[SC_CONFUSION]) //Randomize the target position
                map_random_dir(bl, &ud->to_x, &ud->to_y);

        if(ud->walktimer != -1) {
                // Œ»Ý•à‚¢‚Ä‚¢‚éÅ’†‚Ì–Ú“I’n•ÏX‚Ȃ̂Ń}ƒX–Ú‚Ì’†S‚É—ˆ‚œŽž‚É
                // timerŠÖ”‚©‚çunit_walktoxy_sub‚ðŒÄ‚Ô‚æ‚€‚É‚·‚é
                ud->state.change_walk_target = 1;
                return 1;
        }

        if(ud->attacktimer != -1) {
                delete_timer( ud->attacktimer, unit_attack_timer );
                ud->attacktimer = -1;
        }

        return unit_walktoxy_sub(bl);
}

//To set Mob's CHASE/FOLLOW states (shouldn't be done if there's no path to reach)
#define set_mobstate(bl, flag) \
        if((bl)->type == BL_MOB && (flag)) \
                ((TBL_MOB*)(bl))->state.skillstate = ((TBL_MOB*)(bl))->state.aggressive?MSS_FOLLOW:MSS_RUSH;

static int unit_walktobl_sub(int tid, unsigned int tick, int id, intptr data)
{
        struct block_list *bl = map_id2bl(id);
        struct unit_data *ud = bl?unit_bl2ud(bl):NULL;

        if (ud && ud->walktimer == -1 && ud->target == data)
        {
                if (DIFF_TICK(ud->canmove_tick, tick) > 0) //Keep waiting?
                        add_timer(ud->canmove_tick+1, unit_walktobl_sub, id, data);
                else if (unit_can_move(bl))
                {
                        if (unit_walktoxy_sub(bl))
                                set_mobstate(bl, ud->state.attack_continue);
                }
        }
        return 0;       
}

// Chases a tbl. If the flag&1, use hard-path seek,
// if flag&2, start attacking upon arrival within range, otherwise just walk to that character.
int unit_walktobl(struct block_list *bl, struct block_list *tbl, int range, int flag)
{
        struct unit_data        *ud = NULL;
        struct status_change            *sc = NULL;
        nullpo_retr(0, bl);
        nullpo_retr(0, tbl);
        
        ud = unit_bl2ud(bl);
        if( ud == NULL) return 0;

        if (!(status_get_mode(bl)&MD_CANMOVE))
                return 0;
        
        if (!unit_can_reach_bl(bl, tbl, distance_bl(bl, tbl)+1, flag&1, &ud->to_x, &ud->to_y)) {
                ud->to_x = bl->x;
                ud->to_y = bl->y;
                return 0;
        }

        ud->state.walk_easy = flag&1;
        ud->target = tbl->id;
        ud->chaserange = range; //Note that if flag&2, this SHOULD be attack-range
        ud->state.attack_continue = flag&2?1:0; //Chase to attack.

        sc = status_get_sc(bl);
        if (sc && sc->data[SC_CONFUSION]) //Randomize the target position
                map_random_dir(bl, &ud->to_x, &ud->to_y);

        if (sc && sc->data[SC_FEAR]) //Flee from my target [Brainstorm]
        unit_escape(bl, tbl, 15);


        if(ud->walktimer != -1) {
                ud->state.change_walk_target = 1;
                set_mobstate(bl, flag&2);
                return 1;
        }

        if(DIFF_TICK(ud->canmove_tick, gettick()) > 0)
        {       //Can't move, wait a bit before invoking the movement.
                add_timer(ud->canmove_tick+1, unit_walktobl_sub, bl->id, ud->target);
                return 1;
        }

        if(!unit_can_move(bl))
                return 0;

        if(ud->attacktimer != -1) {
                delete_timer( ud->attacktimer, unit_attack_timer );
                ud->attacktimer = -1;
        }

        if (unit_walktoxy_sub(bl)) {
                set_mobstate(bl, flag&2);
                return 1;
        }
        return 0;
}
#undef set_mobstate

int unit_run(struct block_list *bl)
{
        struct status_change *sc = status_get_sc(bl);
        short to_x,to_y,dir_x,dir_y;
        int lv;
        int i;

        if (!(sc && sc->data[SC_RUN]))
                return 0;
        
        if (!unit_can_move(bl)) {
                status_change_end(bl,SC_RUN,-1);
                return 0;
        }
        
        lv = sc->data[SC_RUN]->val1;
        dir_x = dirx[sc->data[SC_RUN]->val2];
        dir_y = diry[sc->data[SC_RUN]->val2];

        // determine destination cell
        to_x = bl->x;
        to_y = bl->y;
        for(i=0;i<AREA_SIZE;i++)
        {
                if(!map_getcell(bl->m,to_x+dir_x,to_y+dir_y,CELL_CHKPASS))
                        break;

                //if sprinting and there's a PC/Mob/NPC, block the path [Kevin]
                if(sc->data[SC_RUN] && map_count_oncell(bl->m, to_x+dir_x, to_y+dir_y, BL_PC|BL_MOB|BL_NPC))
                        break;
                        
                to_x += dir_x;
                to_y += dir_y;
        }

        if(to_x == bl->x && to_y == bl->y) {
                //If you can't run forward, you must be next to a wall, so bounce back. [Skotlex]
                clif_status_change(bl, SI_BUMP, 1);

                //Set running to 0 beforehand so status_change_end knows not to enable spurt [Kevin]
                unit_bl2ud(bl)->state.running = 0;
                status_change_end(bl,SC_RUN,-1);

                skill_blown(bl,bl,skill_get_blewcount(TK_RUN,lv),unit_getdir(bl),0);
                clif_fixpos(bl); //Why is a clif_slide (skill_blown) AND a fixpos needed? Ask Aegis.
                clif_status_change(bl, SI_BUMP, 0);
                return 0;
        }
        if (unit_walktoxy(bl, to_x, to_y, 1))
                return 1;
        //There must be an obstacle nearby. Attempt walking one cell at a time.
        do {
                to_x -= dir_x;
                to_y -= dir_y;
        } while (--i > 0 && !unit_walktoxy(bl, to_x, to_y, 1));
        if (i==0) {
                // copy-paste from above
                clif_status_change(bl, SI_BUMP, 1);

                //Set running to 0 beforehand so status_change_end knows not to enable spurt [Kevin]
                unit_bl2ud(bl)->state.running = 0;
                status_change_end(bl,SC_RUN,-1);

                skill_blown(bl,bl,skill_get_blewcount(TK_RUN,lv),unit_getdir(bl),0);
                clif_fixpos(bl);
                clif_status_change(bl, SI_BUMP, 0);
                return 0;
        }
        return 1;
}

//Makes bl attempt to run dist cells away from target. Uses hard-paths.
int unit_escape(struct block_list *bl, struct block_list *target, short dist)
{
        int dir = map_calc_dir(target, bl->x, bl->y);
        while( dist > 0 && map_getcell(bl->m, bl->x + dist*dirx[dir], bl->y + dist*diry[dir], CELL_CHKNOREACH) )
                dist--;
        return ( dist > 0 && unit_walktoxy(bl, bl->x + dist*dirx[dir], bl->y + dist*diry[dir], 0) );
}

//Instant warp function.
int unit_movepos(struct block_list *bl, short dst_x, short dst_y, int easy, bool checkpath)
{
        short dx,dy;
        uint8 dir;
        struct unit_data        *ud = NULL;
        struct map_session_data *sd = NULL;

        nullpo_retr(0, bl);
        sd = BL_CAST(BL_PC, bl);
        ud = unit_bl2ud(bl);

        if( ud == NULL) return 0;

        unit_stop_walking(bl,1);
        unit_stop_attack(bl);

        if( checkpath && (map_getcell(bl->m,dst_x,dst_y,CELL_CHKNOPASS) || !path_search(NULL,bl->m,bl->x,bl->y,dst_x,dst_y,easy,CELL_CHKNOREACH)) )
                return 0; // unreachable

        dir = map_calc_dir(bl, dst_x,dst_y);
        ud->dir = dir;

        dx = dst_x - bl->x;
        dy = dst_y - bl->y;

        map_foreachinmovearea(clif_outsight, bl, AREA_SIZE, dx, dy, sd?BL_ALL:BL_PC, bl);

        map_moveblock(bl, dst_x, dst_y, gettick());
        
        ud->walktimer = 1;
        map_foreachinmovearea(clif_insight, bl, AREA_SIZE, -dx, -dy, sd?BL_ALL:BL_PC, bl);
        ud->walktimer = -1;
                
        if(sd) {
                if(map_getcell(bl->m,bl->x,bl->y,CELL_CHKNPC)) {
                        npc_touch_areanpc(sd,bl->m,bl->x,bl->y);
                        if (bl->prev == NULL) //Script could have warped char, abort remaining of the function.
                                return 0;
                } else
                        sd->areanpc_id=0;
                if(sd->status.pet_id > 0 && sd->pd && sd->pd->pet.intimate > 0)
                {       //Check if pet needs to be teleported. [Skotlex]
                        int flag = 0;
                        struct block_list* bl = &sd->pd->bl;
                        if( !checkpath && !path_search(NULL,bl->m,bl->x,bl->y,dst_x,dst_y,0,CELL_CHKNOPASS) )
                                flag = 1;
                        else if (!check_distance_bl(&sd->bl, bl, AREA_SIZE)) //Too far, teleport.
                                flag = 2;
                        if (flag) {
                                unit_movepos(bl,sd->bl.x,sd->bl.y, 0, 0);
                                clif_slide(bl,bl->x,bl->y);
                        }
                }
        }
        return 1;
}

int unit_setdir(struct block_list *bl,unsigned char dir)
{
        struct unit_data *ud;
        nullpo_retr( 0, bl );
        ud = unit_bl2ud(bl);
        if (!ud) return 0;
        ud->dir = dir;
        if (bl->type == BL_PC) 
                ((TBL_PC *)bl)->head_dir = 0;
        clif_changed_dir(bl, AREA);
        return 0;
}

uint8 unit_getdir(struct block_list *bl)
{
        struct unit_data *ud;
        nullpo_retr( 0, bl );
        ud = unit_bl2ud(bl);
        if (!ud) return 0;
        return ud->dir;
}

//Warps a unit/ud to a given map/position. 
//In the case of players, pc_setpos is used.
//it respects the no warp flags, so it is safe to call this without doing nowarpto/nowarp checks.
int unit_warp(struct block_list *bl,short m,short x,short y,int type)
{
        struct unit_data *ud;
        nullpo_retr(0, bl);
        ud = unit_bl2ud(bl);
        
        if(bl->prev==NULL || !ud)
                return 1;

        if (type < 0 || type == 1)
                //Type 1 is invalid, since you shouldn't warp a bl with the "death" 
                //animation, it messes up with unit_remove_map! [Skotlex]
                return 1;
        
        if( m<0 ) m=bl->m;
        
        switch (bl->type) {
                case BL_MOB:
                        if (map[bl->m].flag.monster_noteleport)
                                return 1;
                        if (m != bl->m && map[m].flag.nobranch && battle_config.mob_warp&4)
                                return 1;
                        break;
                case BL_PC:
                        if (map[bl->m].flag.noteleport)
                                return 1;
                        break;
        }
        
        if (x<0 || y<0)
        {       //Random map position.
                if (!map_search_freecell(NULL, m, &x, &y, -1, -1, 1)) {
                        ShowWarning("unit_warp failed. Unit Id:%d/Type:%d, target position map %d (%s) at [%d,%d]\n", bl->id, bl->type, m, map[m].name, x, y);
                        return 2;
                        
                }
        } else if (map_getcell(m,x,y,CELL_CHKNOREACH))
        {       //Invalid target cell
                ShowWarning("unit_warp: Specified non-walkable target cell: %d (%s) at [%d,%d]\n", m, map[m].name, x,y);
                
                if (!map_search_freecell(NULL, m, &x, &y, 4, 4, 1))
                {       //Can't find a nearby cell
                        ShowWarning("unit_warp failed. Unit Id:%d/Type:%d, target position map %d (%s) at [%d,%d]\n", bl->id, bl->type, m, map[m].name, x, y);
                        return 2;
                }
        }

        if (bl->type == BL_PC) //Use pc_setpos
                return pc_setpos((TBL_PC*)bl, map_id2index(m), x, y, type);
        
        if (!unit_remove_map(bl, type))
                return 3;
        
        if (bl->m != m && battle_config.clear_unit_onwarp &&
                battle_config.clear_unit_onwarp&bl->type)
                skill_clear_unitgroup(bl);

        bl->x=ud->to_x=x;
        bl->y=ud->to_y=y;
        bl->m=m;

        map_addblock(bl);
        clif_spawn(bl);
        skill_unit_move(bl,gettick(),1);

        if(bl->type == BL_MOB){
                TBL_MOB *md = (TBL_MOB *)bl;
                if(md->nd) // Tell the script engine we've warped
                        mob_script_callback(md, NULL, CALLBACK_WARPACK);
        }
        return 0;
}

/*==========================================
 * •às’âŽ~
 *------------------------------------------*/
int unit_stop_walking(struct block_list *bl,int type)
{
        struct unit_data *ud;
        struct TimerData *data;
        unsigned int tick;
        nullpo_retr(0, bl);

        ud = unit_bl2ud(bl);
        if(!ud || ud->walktimer == -1)
                return 0;
        //NOTE: We are using timer data after deleting it because we know the 
        //delete_timer function does not messes with it. If the function's 
        //behaviour changes in the future, this code could break!
        data = get_timer(ud->walktimer);
        delete_timer(ud->walktimer, unit_walktoxy_timer);
        ud->walktimer = -1;
        ud->state.change_walk_target = 0;
        tick = gettick();
        if ((type&0x02 && !ud->walkpath.path_pos) //Force moving at least one cell.
                || (data && DIFF_TICK(data->tick, tick) <= data->data/2)) //Enough time has passed to cover half-cell
        {       
                ud->walkpath.path_len = ud->walkpath.path_pos+1;
                unit_walktoxy_timer(-1, tick, bl->id, ud->walkpath.path_pos);
        }

        if(type&0x01)
                clif_fixpos(bl);
        
        ud->walkpath.path_len = 0;
        ud->walkpath.path_pos = 0;
        ud->to_x = bl->x;
        ud->to_y = bl->y;
        if(bl->type == BL_PET && type&~0xff)
                ud->canmove_tick = gettick() + (type>>8);

        //Readded, the check in unit_set_walkdelay means dmg during running won't fall through to this place in code [Kevin]
        if (ud->state.running)
                status_change_end(bl, SC_RUN, -1);
        return 1;
}

int unit_skilluse_id(struct block_list *src, int target_id, short skill_num, short skill_lv)
{
        if(skill_num < 0) return 0;

        return unit_skilluse_id2(
                src, target_id, skill_num, skill_lv,
                skill_castfix(src, skill_num, skill_lv),
                skill_get_castcancel(skill_num)
        );
}

int unit_is_walking(struct block_list *bl)
{
        struct unit_data *ud = unit_bl2ud(bl);
        nullpo_retr(0, bl);
        if(!ud) return 0;
        return (ud->walktimer != -1);
}

/*==========================================
 * Determines if the bl can move based on status changes. [Skotlex]
 *------------------------------------------*/
int unit_can_move(struct block_list *bl)
{
        struct map_session_data *sd;
        struct unit_data *ud;
        struct status_change *sc;
        
        nullpo_retr(0, bl);
        ud = unit_bl2ud(bl);
        sc = status_get_sc(bl);
        sd = BL_CAST(BL_PC, bl);
        
        if (!ud)
                return 0;
        
        if (ud->skilltimer != -1 && (!sd || !pc_checkskill(sd, SA_FREECAST) || skill_get_inf2(ud->skillid)&INF2_GUILD_SKILL))
                return 0; // prevent moving while casting
        
        if (DIFF_TICK(ud->canmove_tick, gettick()) > 0)
                return 0;
        
        if (sd && (
                pc_issit(sd) ||
                sd->vender_id ||
                sd->state.blockedmove
        ))
                return 0; //Can't move
        
        if (sc) {
                if (sc->opt1 > 0 && sc->opt1 != OPT1_STONEWAIT)
                        return 0;

                if ((sc->option & OPTION_HIDE) && (!sd || pc_checkskill(sd, RG_TUNNELDRIVE) <= 0))
                        return 0;

                if (sc->count && (
                        sc->data[SC_ANKLE]
                        || sc->data[SC_AUTOCOUNTER]
                        || sc->data[SC_TRICKDEAD]
                        || sc->data[SC_BLADESTOP]
                        || sc->data[SC_BLADESTOP_WAIT]
                        || sc->data[SC_SPIDERWEB]
                        || (sc->data[SC_DANCING] && sc->data[SC_DANCING]->val4 && (
                                !sc->data[SC_LONGING] ||
                                (sc->data[SC_DANCING]->val1&0xFFFF) == CG_MOONLIT ||
                                (sc->data[SC_DANCING]->val1&0xFFFF) == CG_HERMODE
                        ))
                        || (sc->data[SC_GOSPEL] && sc->data[SC_GOSPEL]->val4 == BCT_SELF)       // cannot move while gospel is in effect
                        || sc->data[SC_STOP]
                        || sc->data[SC_CLOSECONFINE]
                        || sc->data[SC_CLOSECONFINE2]
                        || (sc->data[SC_CLOAKING] && //Need wall at level 1-2
                                sc->data[SC_CLOAKING]->val1 < 3 && !(sc->data[SC_CLOAKING]->val4&1))
                        || sc->data[SC_MADNESSCANCEL]
                        || (sc->data[SC_GRAVITATION] && sc->data[SC_GRAVITATION]->val3 == BCT_SELF)
                ))
                        return 0;
        }
        return 1;
}


/*==========================================
 * Resume running after a walk delay
 *------------------------------------------*/

int unit_resume_running(int tid, unsigned int tick, int id, intptr data)
{

        struct unit_data *ud = (struct unit_data *)data;
        TBL_PC * sd = map_id2sd(id);

        clif_skill_nodamage(ud->bl,ud->bl,TK_RUN,ud->skilllv,
                        sc_start4(ud->bl,status_skill2sc(TK_RUN),100,ud->skilllv,unit_getdir(ud->bl),0,0,0));

        if (sd) clif_walkok(sd);

        return 0;

}


/*==========================================
 * Applies walk delay to character, considering that 
 * if type is 0, this is a damage induced delay: if previous delay is active, do not change it.
 * if type is 1, this is a skill induced delay: walk-delay may only be increased, not decreased.
 *------------------------------------------*/
int unit_set_walkdelay(struct block_list *bl, unsigned int tick, int delay, int type)
{
        struct unit_data *ud = unit_bl2ud(bl);
        if (delay <= 0 || !ud) return 0;
        
        if (type) {
                if (DIFF_TICK(ud->canmove_tick, tick+delay) > 0)
                        return 0;
        } else {
                if (DIFF_TICK(ud->canmove_tick, tick) > 0)
                        return 0;
        }
        ud->canmove_tick = tick + delay;
        if (ud->walktimer != -1)
        {       //Stop walking, if chasing, readjust timers.
                if (delay == 1)
                {       //Minimal delay (walk-delay) disabled. Just stop walking.
                        unit_stop_walking(bl,0);
                } else {
                        //Resume running after can move again [Kevin]
                        if(ud->state.running)
                        {
                                add_timer(ud->canmove_tick, unit_resume_running, bl->id, (int)ud);
                        }
                        else
                        {
                                unit_stop_walking(bl,2);
                                if(ud->target)
                                        add_timer(ud->canmove_tick+1, unit_walktobl_sub, bl->id, ud->target);
                        }
                }
        }
        return 1;
}

int unit_skilluse_id2(struct block_list *src, int target_id, short skill_num, short skill_lv, int casttime, int castcancel)
{
        struct unit_data *ud;
        struct status_data *tstatus;
        struct status_change *sc;
        struct map_session_data *sd = NULL;
        struct block_list * target = NULL;
        unsigned int tick = gettick();
        int temp;

        nullpo_retr(0, src);
        if(status_isdead(src))
                return 0; // Ž€‚ñ‚Å‚¢‚È‚¢‚©

        sd = BL_CAST(BL_PC, src);
        ud = unit_bl2ud(src);

        if(ud == NULL) return 0;
        sc = status_get_sc(src);        
        if (sc && !sc->count)
                sc = NULL; //Unneeded
        //temp: used to signal combo-skills right now.
        temp = (target_id == src->id && !(sd && sd->state.skill_flag)
                && skill_get_inf(skill_num)&INF_SELF_SKILL
                && skill_get_inf2(skill_num)&INF2_NO_TARGET_SELF);
        if (temp)
                target_id = ud->target; //Auto-select skills. [Skotlex]

        if (sd) {
                //Target_id checking.
                if(skillnotok(skill_num, sd)) // [MouseJstr]
                        return 0;

                mob_ksprotected(src, map_id2bl(target_id));

                switch(skill_num)
                {       //Check for skills that auto-select target
                case MO_CHAINCOMBO:
                        if (sc && sc->data[SC_BLADESTOP]){
                                if ((target=(struct block_list *)sc->data[SC_BLADESTOP]->val4) == NULL)
                                        return 0;
                        }
                        break;
                case TK_JUMPKICK:
                case TK_COUNTER:
                case HT_POWER:
                        if (sc && sc->data[SC_COMBO] && sc->data[SC_COMBO]->val1 == skill_num)
                                target_id = sc->data[SC_COMBO]->val2;
                        break;
                case WE_MALE:
                case WE_FEMALE:
                        if (!sd->status.partner_id)
                                return 0;
                        target = (struct block_list*)map_charid2sd(sd->status.partner_id);
                        if (!target) {
                                clif_skill_fail(sd,skill_num,0,0);
                                return 0;
                        }
                        break;
                }
                if (target)
                        target_id = target->id;
        }
        if (src->type==BL_HOM)
        switch(skill_num)
        { //Homun-auto-target skills.
                case HLIF_HEAL:
                case HLIF_AVOID:
                case HAMI_DEFENCE:
                case HAMI_CASTLE:
                        target = battle_get_master(src);
                        if (!target) return 0;
                        target_id = target->id;
        }

        if( !target ) // choose default target
                target = map_id2bl(target_id);

        if( !target || src->m != target->m || !src->prev || !target->prev )
                return 0;

        //Normally not needed because clif.c checks for it, but the at/char/script commands don't! [Skotlex]
        if(ud->skilltimer != -1 && skill_num != SA_CASTCANCEL)
                return 0;

        if(skill_get_inf2(skill_num)&INF2_NO_TARGET_SELF && src->id == target_id)
                return 0;

        if(!status_check_skilluse(src, target, skill_num, 0))
                return 0;

        tstatus = status_get_status_data(target);
        //’Œ‘O‚̃XƒLƒ‹ó‹µ‚Ì‹L˜^
        if(sd) {
                switch(skill_num){
                case SA_CASTCANCEL:
                        if(ud->skillid != skill_num){
                                sd->skillid_old = ud->skillid;
                                sd->skilllv_old = ud->skilllv;
                        }
                        break;
                case BD_ENCORE:
                        //Prevent using the dance skill if you no longer have the skill in your tree. 
                        if(!sd->skillid_dance || pc_checkskill(sd,sd->skillid_dance)<=0){
                                clif_skill_fail(sd,skill_num,0,0);
                                return 0;
                        }
                        sd->skillid_old = skill_num;
                        break;
                case BD_LULLABY:
                case BD_RICHMANKIM:
                case BD_ETERNALCHAOS:
                case BD_DRUMBATTLEFIELD:
                case BD_RINGNIBELUNGEN:
                case BD_ROKISWEIL:
                case BD_INTOABYSS:
                case BD_SIEGFRIED:
                case CG_MOONLIT:
                        if (skill_check_pc_partner(sd, skill_num, &skill_lv, 1, 0) < 1)
                        {
                                clif_skill_fail(sd,skill_num,0,0);
                                return 0;
                        }
                        break;
                }
                if (!skill_check_condition(sd, skill_num, skill_lv, 0))
                        return 0;
        }
        //TODO: Add type-independant skill_check_condition function.
        if (src->type == BL_MOB) {
                switch (skill_num) {
                        case NPC_SUMMONSLAVE:
                        case NPC_SUMMONMONSTER:
                        case AL_TELEPORT:
                                if (((TBL_MOB*)src)->master_id && ((TBL_MOB*)src)->special_state.ai)
                                        return 0;
                }
        }

        //Check range when not using skill on yourself or is a combo-skill during attack
        //(these are supposed to always have the same range as your attack)
        if(src->id != target_id && (!temp || ud->attacktimer == -1))
        {
                if (skill_get_state(ud->skillid) == ST_MOVE_ENABLE)
                {
                        if (!unit_can_reach_bl(src, target, skill_get_range2(src, skill_num,skill_lv)+1, 1, NULL, NULL))
                                return 0; //Walk-path check failed.
                } else
                if      (!battle_check_range(src, target, skill_get_range2(src, skill_num,skill_lv)
                        +(skill_num==RG_CLOSECONFINE?0:1)))
                        //Close confine is exploitable thanks to this extra range "feature" of the client. [Skotlex]
                        return 0; //Arrow-path check failed.
        }

        if (!temp) //Stop attack on non-combo skills [Skotlex]
                unit_stop_attack(src);
        else if(ud->attacktimer != -1) //Elsewise, delay current attack sequence
                ud->attackabletime = tick + status_get_adelay(src);
        
        ud->state.skillcastcancel = castcancel;

        //temp: Used to signal force cast now.
        temp = 0;
        
        switch(skill_num){
        case ALL_RESURRECTION:
                if(battle_check_undead(tstatus->race,tstatus->def_ele)) {       
                        temp = 1;
                        casttime = skill_castfix(src, PR_TURNUNDEAD, skill_lv);
                } else if (!status_isdead(target))
                        return 0; //Can't cast on non-dead characters.
        break;
        case MO_FINGEROFFENSIVE:
                if(sd)
                        casttime += casttime * min(skill_lv, sd->spiritball);
        break;
        case MO_EXTREMITYFIST:
                if (sc && sc->data[SC_COMBO] &&
                   (sc->data[SC_COMBO]->val1 == MO_COMBOFINISH ||
                        sc->data[SC_COMBO]->val1 == CH_TIGERFIST ||
                        sc->data[SC_COMBO]->val1 == CH_CHAINCRUSH))
                        casttime = 0;
                temp = 1;
        break;
        case SA_SPELLBREAKER:
                temp = 1;
        break;
        case ST_CHASEWALK:
                if (sc && sc->data[SC_CHASEWALK])
                        casttime = 0;
        break;
        case TK_RUN:
                if (sc && sc->data[SC_RUN])
                        casttime = 0;
        break;
        case KN_CHARGEATK:
                {
                unsigned int k = (distance_bl(src,target)-1)/3; //+100% every 3 cells of distance
                if( k > 2 ) k = 2; // ...but hard-limited to 300%.
                casttime += casttime * k; 
                }
        break;
        }
        
        // moved here to prevent Suffragium from ending if skill fails
        if (!(skill_get_castnodex(skill_num, skill_lv)&2))
                casttime = skill_castfix_sc(src, casttime);

        if( casttime>0 || temp){ 

                clif_skillcasting(src, src->id, target_id, 0,0, skill_num, skill_get_ele(skill_num, skill_lv), casttime);

                if (sd && target->type == BL_MOB)
                {
                        TBL_MOB *md = (TBL_MOB*)target;
                        mobskill_event(md, src, tick, -1); //Cast targetted skill event.
                        //temp: used to store mob's mode now.
                        if (tstatus->mode&(MD_CASTSENSOR_IDLE|MD_CASTSENSOR_CHASE) &&
                                battle_check_target(target, src, BCT_ENEMY) > 0)
                        {
                                switch (md->state.skillstate) {
                                case MSS_RUSH:
                                case MSS_FOLLOW:
                                        if (!(tstatus->mode&MD_CASTSENSOR_CHASE))
                                                break;
                                        md->target_id = src->id;
                                        md->state.aggressive = (temp&MD_ANGRY)?1:0;
                                        md->min_chase = md->db->range3;
                                        break;
                                case MSS_IDLE:
                                case MSS_WALK:
                                        if (!(tstatus->mode&MD_CASTSENSOR_IDLE))
                                                break;
                                        md->target_id = src->id;
                                        md->state.aggressive = (temp&MD_ANGRY)?1:0;
                                        md->min_chase = md->db->range3;
                                        break;
                                }
                        }
                }
        }

        if( casttime<=0 )
                ud->state.skillcastcancel=0;

        ud->canact_tick  = tick + casttime + 100;
        ud->skilltarget  = target_id;
        ud->skillx       = 0;
        ud->skilly       = 0;
        ud->skillid      = skill_num;
        ud->skilllv      = skill_lv;

        if(sc && sc->data[SC_CLOAKING] &&
                !(sc->data[SC_CLOAKING]->val4&4) && skill_num != AS_CLOAKING)
        {
                status_change_end(src,SC_CLOAKING,-1);
                if (!src->prev) return 0; //Warped away!
        }

        if(casttime > 0) {
                ud->skilltimer = add_timer( tick+casttime, skill_castend_id, src->id, 0 );
                if(sd && pc_checkskill(sd,SA_FREECAST))
                        status_freecast_switch(sd);
                else
                        unit_stop_walking(src,1);
        }
        else
                skill_castend_id(ud->skilltimer,tick,src->id,0);
        return 1;
}

int unit_skilluse_pos(struct block_list *src, short skill_x, short skill_y, short skill_num, short skill_lv)
{
        if(skill_num < 0)
                return 0;
        return unit_skilluse_pos2(
                src, skill_x, skill_y, skill_num, skill_lv,
                skill_castfix(src, skill_num, skill_lv),
                skill_get_castcancel(skill_num)
        );
}

int unit_skilluse_pos2( struct block_list *src, short skill_x, short skill_y, short skill_num, short skill_lv, int casttime, int castcancel)
{
        struct map_session_data *sd = NULL;
        struct unit_data        *ud = NULL;
        struct status_change *sc;
        struct block_list    bl;
        unsigned int tick = gettick();

        nullpo_retr(0, src);

        if(!src->prev) return 0; // map ã‚É‘¶Ý‚·‚é‚©
        if(status_isdead(src)) return 0;

        sd = BL_CAST(BL_PC, src);
        ud = unit_bl2ud(src);
        if(ud == NULL) return 0;

        if(ud->skilltimer != -1) //Normally not needed since clif.c checks for it, but at/char/script commands don't! [Skotlex]
                return 0;
        
        sc = status_get_sc(src);
        if (sc && !sc->count)
                sc = NULL;
        
        if(sd) {
                if (skillnotok(skill_num, sd) || !skill_check_condition(sd, skill_num, skill_lv,0))
                return 0;
        } 
        
        if (!status_check_skilluse(src, NULL, skill_num, 0))
                return 0;

        if( map_getcell(src->m, skill_x, skill_y, CELL_CHKWALL) )
        {// can't cast ground targeted spells on wall cells
                if (sd) clif_skill_fail(sd,skill_num,0,0);
                return 0;
        }

        /* ŽË’ö‚ƏáŠQ•šƒ`ƒFƒbƒN */
        bl.type = BL_NUL;
        bl.m = src->m;
        bl.x = skill_x;
        bl.y = skill_y;

        if (skill_get_state(ud->skillid) == ST_MOVE_ENABLE)
        {
                if (!unit_can_reach_bl(src, &bl, skill_get_range2(src, skill_num,skill_lv)+1, 1, NULL, NULL))
                        return 0; //Walk-path check failed.
        } else
        if      (!battle_check_range(src,&bl,skill_get_range2(src, skill_num,skill_lv)+1))
                return 0; //Arrow-path check failed.

        unit_stop_attack(src);
        ud->state.skillcastcancel = castcancel;

        // moved here to prevent Suffragium from ending if skill fails
        if (!(skill_get_castnodex(skill_num, skill_lv)&2))
                casttime = skill_castfix_sc(src, casttime);

        if( casttime>0 ) {
                unit_stop_walking( src, 1);
                clif_skillcasting(src, src->id, 0, skill_x, skill_y, skill_num, skill_get_ele(skill_num, skill_lv), casttime);
        } else
                ud->state.skillcastcancel=0;

        ud->canact_tick  = tick + casttime + 100;
        ud->skillid      = skill_num;
        ud->skilllv      = skill_lv;
        ud->skillx       = skill_x;
        ud->skilly       = skill_y;
        ud->skilltarget  = 0;

        if (sc && sc->data[SC_CLOAKING] && !(sc->data[SC_CLOAKING]->val4&4))
        {
                status_change_end(src,SC_CLOAKING,-1);
                if (!src->prev) return 0; //Warped away!
        }

        if(casttime > 0) {
                ud->skilltimer = add_timer( tick+casttime, skill_castend_pos, src->id, 0 );
                if(sd && pc_checkskill(sd,SA_FREECAST))
                        status_freecast_switch(sd);
                else
                        unit_stop_walking(src,1);
        }
        else {
                ud->skilltimer = -1;
                skill_castend_pos(ud->skilltimer,tick,src->id,0);
        }
        return 1;
}

static int unit_attack_timer(int tid, unsigned int tick, int id, intptr data);

int unit_stop_attack(struct block_list *bl)
{
        struct unit_data *ud = unit_bl2ud(bl);
        nullpo_retr(0, bl);

        if(!ud || ud->attacktimer == -1)
                return 0;

        delete_timer( ud->attacktimer, unit_attack_timer );
        ud->attacktimer = -1;
        ud->target = 0;
        return 0;
}

//Means current target is unattackable. For now only unlocks mobs.
int unit_unattackable(struct block_list *bl)
{
        struct unit_data *ud = unit_bl2ud(bl);
        if (ud) {
                ud->target = 0;
                ud->state.attack_continue = 0;
        }
        
        if(bl->type == BL_MOB)
                mob_unlocktarget((struct mob_data*)bl, gettick()) ;
        else if(bl->type == BL_PET)
                pet_unlocktarget((struct pet_data*)bl);
        return 0;
}

/*==========================================
 * UŒ‚—v‹
 * type‚ª1‚È‚çŒp‘±UŒ‚
 *------------------------------------------*/
int unit_attack(struct block_list *src,int target_id,int continuous)
{
        struct block_list *target;
        struct unit_data  *ud;

        nullpo_retr(0, ud = unit_bl2ud(src));

        target=map_id2bl(target_id);
        if(target==NULL || status_isdead(target)) {
                unit_unattackable(src);
                return 1;
        }

        if( src->type == BL_PC ){
                TBL_PC* sd = (TBL_PC*)src;
                if( target->type == BL_NPC )
                {// monster npcs [Valaris]
                        npc_click(sd,(TBL_NPC*)target); // submitted by leinsirk10 [Celest]
                        return 0;
                } else if( pc_is90overweight(sd) )
                {// overwheight - stop attacking and walking
                        unit_stop_attack(src);
                        unit_stop_walking(src,1);
                        return 0;
                }
        }

        if(battle_check_target(src,target,BCT_ENEMY)<=0 ||
                !status_check_skilluse(src, target, 0, 0)
        ) {
                unit_unattackable(src);
                return 1;
        }

        ud->target = target_id;
        ud->state.attack_continue = continuous;
        if (continuous) //If you're to attack continously, set to auto-case character
                ud->chaserange = status_get_range(src);

        //Just change target/type. [Skotlex]
        if(ud->attacktimer != -1)
                return 0;

        //Set Mob's ANGRY/BERSERK states.
        if(src->type == BL_MOB)
                ((TBL_MOB*)src)->state.skillstate = ((TBL_MOB*)src)->state.aggressive?MSS_ANGRY:MSS_BERSERK;

        if(DIFF_TICK(ud->attackabletime, gettick()) > 0)
                //Do attack next time it is possible. [Skotlex]
                ud->attacktimer=add_timer(ud->attackabletime,unit_attack_timer,src->id,0);
        else //Attack NOW.
                unit_attack_timer(-1,gettick(),src->id,0);

        return 0;
}

//Cancels an ongoing combo, resets attackable time and restarts the 
//attack timer to resume attacking after amotion time. [Skotlex]
int unit_cancel_combo(struct block_list *bl)
{
        struct unit_data  *ud;

        if (!status_change_end(bl, SC_COMBO, -1))
                return 0; //Combo wasn't active.

        ud = unit_bl2ud(bl);
        nullpo_retr(0, ud);

        ud->attackabletime = gettick() + status_get_amotion(bl);

        if (ud->attacktimer == -1)
                return 1; //Nothing more to do.
        
        delete_timer(ud->attacktimer, unit_attack_timer);
        ud->attacktimer=add_timer(ud->attackabletime,unit_attack_timer,bl->id,0);
        return 1;
}
/*==========================================
 *
 *------------------------------------------*/
bool unit_can_reach_pos(struct block_list *bl,int x,int y, int easy)
{
        nullpo_retr(false, bl);

        if( bl->x==x && bl->y==y )      // “¯‚¶ƒ}ƒX
                return true;

        return path_search(NULL,bl->m,bl->x,bl->y,x,y,easy,CELL_CHKNOREACH);
}

/*==========================================
 *
 *------------------------------------------*/
bool unit_can_reach_bl(struct block_list *bl,struct block_list *tbl, int range, int easy, short *x, short *y)
{
        int i;
        short dx,dy;
        nullpo_retr(false, bl);
        nullpo_retr(false, tbl);

        if( bl->m != tbl->m)
                return false;
        
        if( bl->x==tbl->x && bl->y==tbl->y )
                return true;

        if(range>0 && !check_distance_bl(bl, tbl, range))
                return false;

        // It judges whether it can adjoin or not.
        dx=tbl->x - bl->x;
        dy=tbl->y - bl->y;
        dx=(dx>0)?1:((dx<0)?-1:0);
        dy=(dy>0)?1:((dy<0)?-1:0);
        
        if (map_getcell(tbl->m,tbl->x-dx,tbl->y-dy,CELL_CHKNOPASS))
        {       //Look for a suitable cell to place in.
                for(i=0;i<9 && map_getcell(tbl->m,tbl->x-dirx[i],tbl->y-diry[i],CELL_CHKNOPASS);i++);
                if (i==9) return false; //No valid cells.
                dx = dirx[i];
                dy = diry[i];
        }

        if (x) *x = tbl->x-dx;
        if (y) *y = tbl->y-dy;
        return path_search(NULL,bl->m,bl->x,bl->y,tbl->x-dx,tbl->y-dy,easy,CELL_CHKNOREACH);
}


/*==========================================
 * PC‚̍UŒ‚ (timerŠÖ”)
 *------------------------------------------*/
static int unit_attack_timer_sub(struct block_list* src, int tid, unsigned int tick)
{
        struct block_list *target;
        struct unit_data *ud;
        struct status_data *sstatus;
        struct map_session_data *sd = NULL;
        struct mob_data *md = NULL;
        int range;
        
        if((ud=unit_bl2ud(src))==NULL)
                return 0;
        if(ud->attacktimer != tid){
                ShowError("unit_attack_timer %d != %d\n",ud->attacktimer,tid);
                return 0;
        }
        sd = BL_CAST(BL_PC, src);
        md = BL_CAST(BL_MOB, src);
        ud->attacktimer=-1;
        target=map_id2bl(ud->target);

        if(src == NULL || src->prev == NULL || target==NULL || target->prev == NULL)
                return 0;

        if(status_isdead(src) || status_isdead(target) || !status_check_skilluse(src, target, 0, 0))
                return 0; // can't attack under these conditions

        if (src->m != target->m)
        {
                if (src->type == BL_MOB && mob_warpchase((TBL_MOB*)src, target))
                        return 1; // Follow up.
                return 0;
        }

        if(ud->skilltimer != -1 && !(sd && pc_checkskill(sd,SA_FREECAST) > 0))
                return 0; // can't attack while casting
        
        if(!battle_config.sdelay_attack_enable && DIFF_TICK(ud->canact_tick,tick) > 0 && !(sd && pc_checkskill(sd,SA_FREECAST) > 0))
        {       // attacking when under cast delay has restrictions:
                if (tid == -1) { //requested attack.
                        if(sd) clif_skill_fail(sd,1,4,0);
                        return 0;
                }
                //Otherwise, we are in a combo-attack, delay this until your canact time is over. [Skotlex]
                if(ud->state.attack_continue) {
                        if (DIFF_TICK(ud->canact_tick, ud->attackabletime) > 0)
                                ud->attackabletime = ud->canact_tick;
                        ud->attacktimer=add_timer(ud->attackabletime,unit_attack_timer,src->id,0);
                }
                return 1;
        }

        sstatus = status_get_status_data(src);
        range = sstatus->rhw.range;
        
        if(!sd || sd->status.weapon != W_BOW) range++; //Dunno why everyone but bows gets this extra range...
        if(unit_is_walking(target)) range++; //Extra range when chasing

        if(!check_distance_bl(src,target,range) ) {
                //Chase if required.
                if(sd)
                        clif_movetoattack(sd,target);
                else if(ud->state.attack_continue)
                        unit_walktobl(src,target,ud->chaserange,ud->state.walk_easy|2);
                return 1;
        }
        if(!battle_check_range(src,target,range)) {
                //Within range, but no direct line of attack
                if(ud->state.attack_continue) {
                        if(ud->chaserange > 2) ud->chaserange-=2;
                        unit_walktobl(src,target,ud->chaserange,ud->state.walk_easy|2);
                }
                return 1;
        }

        //Sync packet only for players.
        //Non-players use the sync packet on the walk timer. [Skotlex]
        if (tid == -1 && sd) clif_fixpos(src);

        if(DIFF_TICK(ud->attackabletime,tick) <= 0)
        {
                if (battle_config.attack_direction_change && (src->type&battle_config.attack_direction_change)) {
                        ud->dir = map_calc_dir(src, target->x,target->y );
                }
                if(ud->walktimer != -1)
                        unit_stop_walking(src,1);
                if(md) {
                        if (mobskill_use(md,tick,-1))
                                return 1;
                        if (sstatus->mode&MD_ASSIST && DIFF_TICK(md->last_linktime, tick) < MIN_MOBLINKTIME)
                        {       // Link monsters nearby [Skotlex]
                                md->last_linktime = tick;
                                map_foreachinrange(mob_linksearch, src, md->db->range2, BL_MOB, md->class_, target, tick);
                        }
                }
                if(src->type == BL_PET && pet_attackskill((TBL_PET*)src, target->id))
                        return 1;
                
                map_freeblock_lock();
                ud->attacktarget_lv = battle_weapon_attack(src,target,tick,0);

                if(sd && sd->status.pet_id > 0 && sd->pd && battle_config.pet_attack_support)
                        pet_target_check(sd,target,0);
                map_freeblock_unlock();

                ud->attackabletime = tick + sstatus->adelay;
//              You can't move if you can't attack neither.
                if (src->type&battle_config.attack_walk_delay)
                        unit_set_walkdelay(src, tick, sstatus->amotion, 1);
        }

        if(ud->state.attack_continue)
                ud->attacktimer = add_timer(ud->attackabletime,unit_attack_timer,src->id,0);

        return 1;
}

static int unit_attack_timer(int tid, unsigned int tick, int id, intptr data)
{
        struct block_list *bl;
        bl = map_id2bl(id);
        if(bl && unit_attack_timer_sub(bl, tid, tick) == 0)
                unit_unattackable(bl);
        return 0;
}

/*==========================================
 * Cancels an ongoing skill cast.
 * flag&1: Cast-Cancel invoked.
 * flag&2: Cancel only if skill is cancellable.
 *------------------------------------------*/
int unit_skillcastcancel(struct block_list *bl,int type)
{
        struct map_session_data *sd = NULL;
        struct unit_data *ud = unit_bl2ud( bl);
        unsigned int tick=gettick();
        int ret=0, skill;
        
        nullpo_retr(0, bl);
        if (!ud || ud->skilltimer==-1)
                return 0; //Nothing to cancel.

        sd = BL_CAST(BL_PC, bl);

        if (type&2) {
                //See if it can be cancelled.
                if (!ud->state.skillcastcancel)
                        return 0;

                if (sd && (sd->special_state.no_castcancel2 ||
                        (sd->special_state.no_castcancel && !map_flag_gvg(bl->m)))) //fixed flags being read the wrong way around [blackhole89]
                        return 0;
        }
        
        ud->canact_tick=tick;
        if(sd && pc_checkskill(sd,SA_FREECAST))
                status_freecast_switch(sd);
        
        if(type&1 && sd)
                skill = sd->skillid_old;
        else
                skill = ud->skillid;
        
        if (skill_get_inf(skill) & INF_GROUND_SKILL)
                ret=delete_timer( ud->skilltimer, skill_castend_pos );
        else
                ret=delete_timer( ud->skilltimer, skill_castend_id );
        if(ret<0)
                ShowError("delete timer error : skillid : %d\n",ret);
        
        if(bl->type==BL_MOB) ((TBL_MOB*)bl)->skillidx  = -1;

        ud->skilltimer = -1;
        clif_skillcastcancel(bl);
        return 1;
}

// unit_data ‚̏‰Šú‰»ˆ—
void unit_dataset(struct block_list *bl)
{
        struct unit_data *ud;
        nullpo_retv(ud = unit_bl2ud(bl));

        memset( ud, 0, sizeof( struct unit_data) );
        ud->bl             = bl;
        ud->walktimer      = -1;
        ud->skilltimer     = -1;
        ud->attacktimer    = -1;
        ud->attackabletime = 
        ud->canact_tick    = 
        ud->canmove_tick   = gettick();
}

/*==========================================
 * Returns 1 if this unit is attacking target 'id'
 *------------------------------------------*/
static int unit_counttargeted_sub(struct block_list* bl, va_list ap)
{
        int id = va_arg(ap, int);
        int target_lv = va_arg(ap, int); // extra condition
        struct unit_data* ud;

        if(bl->id == id)
                return 0;

        ud = unit_bl2ud(bl);

        if (ud && ud->target == id && ud->attacktimer != -1 && ud->attacktarget_lv >= target_lv)
                return 1;

        return 0;       
}

/*==========================================
 * Counts the number of units attacking 'bl'
 *------------------------------------------*/
int unit_counttargeted(struct block_list* bl, int target_lv)
{
        nullpo_retr(0, bl);
        return (map_foreachinrange(unit_counttargeted_sub, bl, AREA_SIZE, BL_CHAR, bl->id, target_lv));
}

/*==========================================
 *
 *------------------------------------------*/
int unit_fixdamage(struct block_list *src,struct block_list *target,unsigned int tick,int sdelay,int ddelay,int damage,int div,int type,int damage2)
{
        nullpo_retr(0, target);

        if(damage+damage2 <= 0)
                return 0;
        
        return status_fix_damage(src,target,damage+damage2,clif_damage(target,target,tick,sdelay,ddelay,damage,div,type,damage2));
}

/*==========================================
 * Œ©‚œ–ڂ̃TƒCƒY‚ð•ÏX‚·‚é
 *------------------------------------------*/
int unit_changeviewsize(struct block_list *bl,short size)
{
        nullpo_retr(0, bl);

        size=(size<0)?-1:(size>0)?1:0;

        if(bl->type == BL_PC) {
                ((TBL_PC*)bl)->state.size=size;
        } else if(bl->type == BL_MOB) {
                ((TBL_MOB*)bl)->special_state.size=size;
        } else
                return 0;
        if(size!=0)
                clif_misceffect2(bl,421+size);
        return 0;
}

/*==========================================
 * Removes a bl/ud from the map.
 * Returns 1 on success. 0 if it couldn't be removed or the bl was free'd
 * if clrtype is 1 (death), appropiate cleanup is performed. 
 * Otherwise it is assumed bl is being warped.
 * On-Kill specific stuff is not performed here, look at status_damage for that.
 *------------------------------------------*/
int unit_remove_map_(struct block_list *bl, int clrtype, const char* file, int line, const char* func)
{
        struct unit_data *ud = unit_bl2ud(bl);
        struct status_change *sc = status_get_sc(bl);
        nullpo_retr(0, ud);

        if(bl->prev == NULL)
                return 0; //Already removed?

        map_freeblock_lock();

        ud->target = 0; //Unlock walk/attack target.
        if (ud->walktimer != -1)
                unit_stop_walking(bl,0);
        if (ud->attacktimer != -1)
                unit_stop_attack(bl);
        if (ud->skilltimer != -1)
                unit_skillcastcancel(bl,0);
// Do not reset can-act delay. [Skotlex]
        ud->attackabletime = ud->canmove_tick /*= ud->canact_tick*/ = gettick();
        
        if(sc && sc->count ) { //map-change/warp dispells.
                status_change_end(bl,SC_BLADESTOP,-1);
                status_change_end(bl,SC_BASILICA,-1);
                status_change_end(bl,SC_ANKLE,-1);
                status_change_end(bl,SC_TRICKDEAD,-1);
                status_change_end(bl,SC_BLADESTOP,-1);
                status_change_end(bl,SC_RUN,-1);
                skill_stop_dancing(bl);
                status_change_end(bl,SC_WARM,-1);
                status_change_end(bl,SC_DEVOTION,-1);
                status_change_end(bl,SC_MARIONETTE,-1);
                status_change_end(bl,SC_MARIONETTE2,-1);
                status_change_end(bl,SC_CLOSECONFINE,-1);
                status_change_end(bl,SC_CLOSECONFINE2,-1);
                status_change_end(bl,SC_HIDING,-1);
                status_change_end(bl,SC_CLOAKING,-1);
                status_change_end(bl,SC_CHASEWALK,-1);
                if (sc->data[SC_GOSPEL] && sc->data[SC_GOSPEL]->val4 == BCT_SELF)
                        status_change_end(bl,SC_GOSPEL,-1);
                status_change_end(bl,SC_CHANGE,-1);
                status_change_end(bl,SC_MIRACLE,-1);
        }

        if (bl->type&BL_CHAR) {
                skill_unit_move(bl,gettick(),4);
                skill_cleartimerskill(bl);
        }

        switch( bl->type )
        {
        case BL_PC:
        {
                struct map_session_data *sd = (struct map_session_data*)bl;

                //Leave/reject all invitations.
                if(sd->chatID)
                        chat_leavechat(sd,0);
                if(sd->trade_partner)
                        trade_tradecancel(sd);
                if(sd->vender_id)
                        vending_closevending(sd);
                if(sd->state.storage_flag == 1)
                        storage_storage_quit(sd,0);
                else if (sd->state.storage_flag == 2)
                        storage_guild_storage_quit(sd,0);
                sd->state.storage_flag = 0; //Force close it when being warped.
                if(sd->party_invite>0)
                        party_reply_invite(sd,sd->party_invite_account,0);
                if(sd->guild_invite>0)
                        guild_reply_invite(sd,sd->guild_invite,0);
                if(sd->guild_alliance>0)
                        guild_reply_reqalliance(sd,sd->guild_alliance_account,0);
                if(sd->menuskill_id)
                        sd->menuskill_id = sd->menuskill_val = 0;

                sd->npc_shopid = 0;
                sd->adopt_invite = 0;

                if(sd->pvp_timer!=-1) {
                        delete_timer(sd->pvp_timer,pc_calc_pvprank_timer);
                        sd->pvp_timer = -1;
                        sd->pvp_rank = 0;
                }
                if(sd->duel_group > 0)
                        duel_leave(sd->duel_group, sd);

                if(pc_issit(sd)) {
                        pc_setstand(sd);
                        skill_sit(sd,0);
                }
                party_send_dot_remove(sd);//minimap dot fix [Kevin]
                guild_send_dot_remove(sd);

                if( map[bl->m].users <= 0 || sd->state.debug_remove_map )
                {// this is only place where map users is decreased, if the mobs were removed too soon then this function was executed too many times [FlavioJS]
                        if( sd->debug_file == NULL || !(sd->state.debug_remove_map) )
                        {
                                sd->debug_file = "";
                                sd->debug_line = 0;
                                sd->debug_func = "";
                        }
                        ShowDebug("unit_remove_map: unexpected state when removing player AID/CID:%d/%d"
                                " (active=%d connect_new=%d rewarp=%d changemap=%d debug_remove_map=%d)"
                                " from map=%s (users=%d)."
                                " Previous call from %s:%d(%s), current call from %s:%d(%s)."
                                " Please report this!!!\n",
                                sd->status.account_id, sd->status.char_id,
                                sd->state.active, sd->state.connect_new, sd->state.rewarp, sd->state.changemap, sd->state.debug_remove_map,
                                map[bl->m].name, map[bl->m].users,
                                sd->debug_file, sd->debug_line, sd->debug_func, file, line, func);
                }
                else
                if (--map[bl->m].users == 0 && battle_config.dynamic_mobs)      //[Skotlex]
                        map_removemobs(bl->m);
                sd->state.debug_remove_map = 1; // temporary state to track double remove_map's [FlavioJS]
                sd->debug_file = file;
                sd->debug_line = line;
                sd->debug_func = func;

                break;
        }
        case BL_MOB:
        {
                struct mob_data *md = (struct mob_data*)bl;
                md->target_id=0;
                md->attacked_id=0;
                md->state.skillstate= MSS_IDLE;

                break;
        }
        case BL_PET:
        {
                struct pet_data *pd = (struct pet_data*)bl;
                if( pd->pet.intimate <= 0 && !(pd->msd && !pd->msd->state.active) )
                {       //If logging out, this is deleted on unit_free
                        clif_clearunit_area(bl,clrtype);
                        map_delblock(bl);
                        unit_free(bl,0);
                        map_freeblock_unlock();
                        return 0;
                }

                break;
        }
        case BL_HOM:
        {
                struct homun_data *hd = (struct homun_data *) bl;
                ud->canact_tick = ud->canmove_tick; //It appears HOM do reset the can-act tick.
                if(!hd->homunculus.intimacy && !(hd->master && !hd->master->state.active) )
                {       //If logging out, this is deleted on unit_free
                        clif_emotion(bl, 28) ;  //sob
                        clif_clearunit_area(bl,clrtype);
                        map_delblock(bl);
                        unit_free(bl,0);
                        map_freeblock_unlock();
                        return 0;
                }

                break;
        }
        default: ;// do nothing
        }

        clif_clearunit_area(bl,clrtype);
        map_delblock(bl);
        map_freeblock_unlock();
        return 1;
}

void unit_remove_map_pc(struct map_session_data *sd, int clrtype)
{
        unit_remove_map(&sd->bl,clrtype);

        if (clrtype == 3) clrtype = 0; //3 is the warp from logging out, but pets/homunc need to just 'vanish' instead of showing the warping out animation.

        if(sd->pd)
                unit_remove_map(&sd->pd->bl, clrtype);
        if(merc_is_hom_active(sd->hd))
                unit_remove_map(&sd->hd->bl, clrtype);
}

void unit_free_pc(struct map_session_data *sd)
{
        if (sd->pd) unit_free(&sd->pd->bl,0);
        if (sd->hd) unit_free(&sd->hd->bl,0);
        unit_free(&sd->bl,3);
}

/*==========================================
 * Function to free all related resources to the bl
 * if unit is on map, it is removed using the clrtype specified
 * If clrtype is <0, no saving is performed. This is only for non-authed
 * objects that shouldn't be on a map yet.
 *------------------------------------------*/
int unit_free(struct block_list *bl, int clrtype)
{
        struct unit_data *ud = unit_bl2ud( bl );
        nullpo_retr(0, ud);

        map_freeblock_lock();
        if( bl->prev )  //Players are supposed to logout with a "warp" effect.
                unit_remove_map(bl, clrtype);
        
        if( bl->type == BL_PC ) {
                struct map_session_data *sd = (struct map_session_data*)bl;
                if(status_isdead(bl))
                        pc_setrestartvalue(sd,2);

                pc_delinvincibletimer(sd);
        
                pc_autoscript_clear(sd->autoscript, ARRAYLENGTH(sd->autoscript));
                pc_autoscript_clear(sd->autoscript2, ARRAYLENGTH(sd->autoscript2));

                if (sd->followtimer != -1)
                        pc_stop_following(sd);
                        
                if(sd->duel_invite > 0)
                        duel_reject(sd->duel_invite, sd);
        
                // Notify friends that this char logged out. [Skotlex]
                map_foreachpc(clif_friendslist_toggle_sub, sd->status.account_id, sd->status.char_id, 0);
                party_send_logout(sd);
                guild_send_memberinfoshort(sd,0);
                pc_cleareventtimer(sd);
                pc_delspiritball(sd,sd->spiritball,1);

                if(sd->reg)
                {       //Double logout already freed pointer fix... [Skotlex]
                        aFree(sd->reg);
                        sd->reg = NULL;
                        sd->reg_num = 0;
                }
                if(sd->regstr)
                {
                        int i;
                        for( i = 0; i < sd->regstr_num; ++i )
                                if( sd->regstr[i].data )
                                        aFree(sd->regstr[i].data);
                        aFree(sd->regstr);
                        sd->regstr = NULL;
                        sd->regstr_num = 0;
                }

                //Tell the script to end, not delete it, it will free itself when necessary [Kevin]
                if (sd->st) {
                        sd->st->rid = 0;
                        sd->st->state = 2;
                }
        } else if( bl->type == BL_PET ) {
                struct pet_data *pd = (struct pet_data*)bl;
                struct map_session_data *sd = pd->msd;
                pet_hungry_timer_delete(pd);
                if (pd->a_skill)
                {
                        aFree(pd->a_skill);
                        pd->a_skill = NULL;
                }
                if (pd->s_skill)
                {
                        if (pd->s_skill->timer != -1) {
                                if (pd->s_skill->id)
                                        delete_timer(pd->s_skill->timer, pet_skill_support_timer);
                                else
                                        delete_timer(pd->s_skill->timer, pet_heal_timer);
                        }
                        aFree(pd->s_skill);
                        pd->s_skill = NULL;
                }
                if(pd->recovery)
                {
                        if(pd->recovery->timer != -1)
                                delete_timer(pd->recovery->timer, pet_recovery_timer);
                        aFree(pd->recovery);
                        pd->recovery = NULL;
                }
                if(pd->bonus)
                {
                        if (pd->bonus->timer != -1)
                                delete_timer(pd->bonus->timer, pet_skill_bonus_timer);
                        aFree(pd->bonus);
                        pd->bonus = NULL;
                }
                if (pd->loot)
                {
                        pet_lootitem_drop(pd,sd);
                        if (pd->loot->item)
                                aFree(pd->loot->item);
                        aFree (pd->loot);
                        pd->loot = NULL;
                }
                if (clrtype >= 0) {
                        if(pd->pet.intimate > 0)
                                intif_save_petdata(pd->pet.account_id,&pd->pet);
                        else
                        {       //Remove pet.
                                intif_delete_petdata(pd->pet.pet_id);
                                if (sd) sd->status.pet_id = 0;
                        }
                }
                if (sd) sd->pd = NULL;
        } else if(bl->type == BL_MOB) {
                struct mob_data *md = (struct mob_data*)bl;
                if(md->deletetimer!=-1) {
                        delete_timer(md->deletetimer,mob_timer_delete);
                        md->deletetimer=-1;
                }
                if(md->lootitem) {
                        aFree(md->lootitem);
                        md->lootitem=NULL;
                }
                if( md->guardian_data )
                {
                        struct guild_castle* gc = md->guardian_data->castle;
                        if( md->guardian_data->number >= 0 && md->guardian_data->number < MAX_GUARDIANS )
                        {
                                gc->guardian[md->guardian_data->number].id = 0;
                        }
                        else
                        {
                                int i;
                                ARR_FIND(0, gc->temp_guardians_max, i, gc->temp_guardians[i] == md->bl.id);
                                if( i < gc->temp_guardians_max )
                                        gc->temp_guardians[i] = 0;
                        }
                        aFree(md->guardian_data);
                        md->guardian_data = NULL;
                }
                if(md->spawn)
                {
                        md->spawn->active--;

                        if( !md->spawn->state.dynamic )
                        {// permanently remove the mob
                                if( --md->spawn->num == 0 )
                                {// Last freed mob is responsible for deallocating the group's spawn data.
                                        aFree(md->spawn);
                                        md->spawn = NULL;
                                }
                        }
                }
                if(md->base_status) {
                        aFree(md->base_status);
                        md->base_status = NULL;
                }
                if(mob_is_clone(md->class_))
                        mob_clone_delete(md->class_);
        } else if(bl->type == BL_HOM) {
                struct homun_data *hd = (TBL_HOM*)bl;
                struct map_session_data *sd = hd->master;
                // Desactive timers
                merc_hom_hungry_timer_delete(hd);
                if (clrtype >= 0) {
                        if (hd->homunculus.intimacy > 0)
                                merc_save(hd); 
                        else
                        {
                                intif_homunculus_requestdelete(hd->homunculus.hom_id);
                                if (sd) sd->status.hom_id = 0;
                        }
                }
                if(sd) sd->hd = NULL;
        }

        skill_clear_unitgroup(bl);
        status_change_clear(bl,1);
        map_deliddb(bl);
        if (bl->type != BL_PC) //Players are handled by map_quit
                map_freeblock(bl);
        map_freeblock_unlock();
        return 0;
}

int do_init_unit(void)
{
        add_timer_func_list(unit_attack_timer,  "unit_attack_timer");
        add_timer_func_list(unit_walktoxy_timer,"unit_walktoxy_timer");
        add_timer_func_list(unit_walktobl_sub, "unit_walktobl_sub");
        add_timer_func_list(unit_delay_walktoxy_timer,"unit_delay_walktoxy_timer");
        return 0;
}

int do_final_unit(void)
{
        // nothing to do
        return 0;
}