server/server/skills.c

/*
 * static char *rcsid_skills_c =
 *   "$Id: skills.c,v 1.72 2006/01/08 16:54:38 akirschbaum Exp $";
 */
/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2003 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    The authors can be reached via e-mail to crossfire-devel@real-time.com
*/

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

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

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

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

    /* ADJUSTMENTS */

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

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

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

/* 
 * When stealing: dependent on the intelligence/wisdom of whom you're
 * stealing from (op in attempt_steal), offset by your dexterity and
 * skill at stealing. They may notice your attempt, whether successful
 * or not. 
 * op is the target (person being pilfered)
 * who is the person doing the stealing.
 * skill is the skill object (stealing).
 */

static int attempt_steal(object* op, object* who, object *skill)
{
    object *success=NULL, *tmp=NULL, *next;
    int roll=0, chance=0, stats_value;
    rv_vector   rv;

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

    /* if the victim is aware of a thief in the area (FLAG_NO_STEAL set on them)
     * they will try to prevent stealing if they can. Only unseen theives will
     * have much chance of success. 
     */
    if(op->type!=PLAYER && QUERY_FLAG(op,FLAG_NO_STEAL)) {
        if(can_detect_enemy(op,who,&rv)) {
            npc_call_help(op);
            CLEAR_FLAG(op, FLAG_UNAGGRESSIVE);
            new_draw_info(NDI_UNIQUE, 0,who,"Your attempt is prevented!");
            return 0;
        } else /* help npc to detect thief next time by raising its wisdom */ 
            op->stats.Wis += (op->stats.Int/5)+1;
            if (op->stats.Wis > MAX_STAT) op->stats.Wis = MAX_STAT;
    }
    if (op->type == PLAYER && QUERY_FLAG(op, FLAG_WIZ)) {
        new_draw_info(NDI_UNIQUE, 0, who, "You can't steal from the dungeon master!\n");
        return 0;
    }
    if(op->type == PLAYER && who->type == PLAYER && settings.no_player_stealing) {
      new_draw_info(NDI_UNIQUE, 0, who, "You can't steal from other players!\n");
      return 0;
    }


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

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

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

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

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

        if((chance=adj_stealchance(who,op,(stats_value+skill->level * 10 - op->level * 3)))==-1)
            return 0;
        else if (roll < chance ) {
            tag_t tmp_count = tmp->count;

            pick_up(who, tmp);
            /* need to see if the player actually stole this item -
             * if it is in the players inv, assume it is.  This prevents
             * abuses where the player can not carry the item, so just
             * keeps stealing it over and over.
             */
            if (was_destroyed(tmp, tmp_count) || tmp->env != op) {
                /* for players, play_sound: steals item */
                success = tmp;
                CLEAR_FLAG(tmp, FLAG_INV_LOCKED);

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

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

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

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

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

        if(op->type != PLAYER) {
            /* The unaggressives look after themselves 8) */
            if(who->type==PLAYER) {
                npc_call_help(op);
                new_draw_info_format(NDI_UNIQUE, 0,who,
                  "%s notices your attempted pilfering!",query_name(op));
            }
            CLEAR_FLAG(op, FLAG_UNAGGRESSIVE);
            /* all remaining npc items are guarded now. Set flag NO_STEAL 
             * on the victim. 
             */
            SET_FLAG(op,FLAG_NO_STEAL);
        } else { /* stealing from another player */
            char buf[MAX_BUF];
            /* Notify the other player */
            if (success && who->stats.Int > random_roll(0, 19, op, PREFER_LOW)) {
                sprintf(buf, "Your %s is missing!", query_name(success));
            } else {
                sprintf(buf, "Your pack feels strangely lighter.");
            }
            new_draw_info(NDI_UNIQUE, 0,op,buf);
            if (!success) {
                if (who->invisible) {
                    sprintf(buf, "you feel itchy fingers getting at your pack.");
                } else {
                    sprintf(buf, "%s looks very shifty.", query_name(who));
                }
                new_draw_info(NDI_UNIQUE, 0,op,buf);
            }
        } /* else stealing from another player */
        /* play_sound("stop! thief!"); kindofthing */
    } /* if you weren't 100% successful */
    return success? 1:0;
}


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

    x = op->x + freearr_x[dir];
    y = op->y + freearr_y[dir];
    
    if(dir == 0) {
        /* Can't steal from ourself! */
        return 0;
    }

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

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

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

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

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

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

            /* no xp for stealing from pets (of players) */
            if (QUERY_FLAG(tmp, FLAG_FRIENDLY) && tmp->attack_movement == PETMOVE) {
                object *owner = get_owner(tmp);
                if (owner != NULL && owner->type == PLAYER)
                    return 0;
            }

            return (calc_skill_exp(op,tmp, skill));
        }
    }
    return 0;
}

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


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


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

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

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

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

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

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

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

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


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

static int attempt_hide(object *op, object *skill) {
    int number,difficulty=op->map->difficulty;
    int terrain = hideability(op);

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

    /*  Hiding success and duration dependant on skill level,
     *  op->stats.Dex, map difficulty and terrain. 
     */

    number = (die_roll(2, 25, op, PREFER_LOW)-2)/2;
    if(!stand_near_hostile(op) && (number < (op->stats.Dex + skill->level + terrain - difficulty))) {
        op->invisible += 100;  /* set the level of 'hiddeness' */
        if(op->type==PLAYER)
            op->contr->tmp_invis=1;
        op->hide=1;
        return 1;
    }
    return 0;
}

/* patched this to take terrain into consideration */

int hide(object *op, object *skill) {

    /* the preliminaries -- Can we really hide now? */
    /* this keeps monsters from using invisibilty spells and hiding */

    if (QUERY_FLAG(op, FLAG_MAKE_INVIS)) {
        new_draw_info(NDI_UNIQUE, 0,op,"You don't need to hide while invisible!");
        return 0;
    } else if (!op->hide && op->invisible>0 && op->type == PLAYER) { 
        new_draw_info(NDI_UNIQUE, 0,op,"Your attempt to hide breaks the invisibility spell!"); 
        make_visible(op);
    }
 
    if(op->invisible>(50*skill->level)) {
        new_draw_info(NDI_UNIQUE,0,op,"You are as hidden as you can get."); 
        return 0;
    }
  
    if(attempt_hide(op, skill)) { 
        new_draw_info(NDI_UNIQUE, 0,op,"You hide in the shadows.");
        update_object(op,UP_OBJ_FACE);
        return calc_skill_exp(op, NULL, skill);
    }
    new_draw_info(NDI_UNIQUE,0,op,"You fail to conceal yourself.");
    return 0; 
}


/* stop_jump() - End of jump. Clear flags, restore the map, and 
 * freeze the jumper a while to simulate the exhaustion
 * of jumping.
 */
static void stop_jump(object *pl, int dist, int spaces) {
    fix_player(pl);
    insert_ob_in_map(pl,pl->map,pl,0);
}


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

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

    remove_ob(pl);

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

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

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

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

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

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

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

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

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

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

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


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

static int do_skill_detect_curse(object *pl, object *skill) {
    object *tmp;
    int success=0;
 
    for(tmp=pl->inv;tmp;tmp=tmp->below)
        if (!tmp->invisible
            && !QUERY_FLAG(tmp,FLAG_IDENTIFIED) && !QUERY_FLAG(tmp,FLAG_KNOWN_CURSED)
            && (QUERY_FLAG(tmp,FLAG_CURSED) || QUERY_FLAG(tmp,FLAG_DAMNED)) &&
            tmp->item_power < skill->level) {
                SET_FLAG(tmp,FLAG_KNOWN_CURSED);
                esrv_update_item(UPD_FLAGS, pl, tmp);
                success+= calc_skill_exp(pl,tmp, skill);
        }

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

    return success;
}

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

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

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

    return success;
}

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

    if(!QUERY_FLAG(tmp,FLAG_IDENTIFIED) && !QUERY_FLAG(tmp,FLAG_NO_SKILL_IDENT) 
       && need_identify(tmp) && !tmp->invisible && tmp->type==obj_class) {
        ip = tmp->magic;
        if (tmp->item_power > ip) ip=tmp->item_power;

            chance = die_roll(3, 10, pl, PREFER_LOW)-3 +
                        rndm(0, (tmp->magic ? tmp->magic*5 : 1)-1); 
                if(skill_value >= chance) {
                  identify(tmp);
                  if (pl->type==PLAYER) {
                    new_draw_info_format(NDI_UNIQUE, 0, pl,
                      "You identify %s.", long_desc(tmp, pl));
                    if (tmp->msg) {
                        new_draw_info(NDI_UNIQUE, 0,pl, "The item has a story:");
                        new_draw_info(NDI_UNIQUE, 0,pl, tmp->msg);
                    }
                    /* identify will take care of updating the item if
                     * it is in the players inventory.  IF on map, do it
                     * here
                     */
                    if (tmp->map)
                        esrv_send_item(pl, tmp);
                  }
                  success += calc_skill_exp(pl,tmp, skill);
                } else 
                  SET_FLAG(tmp, FLAG_NO_SKILL_IDENT);
        }
        return success;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/* players using this skill can 'charm' a monster --
 * into working for them. It can only be used on 
 * non-special (see below) 'neutral' creatures. 
 * -b.t. (thomas@astro.psu.edu)
 */

int use_oratory(object *pl, int dir, object *skill) {
    sint16 x=pl->x+freearr_x[dir],y=pl->y+freearr_y[dir];
    int mflags,chance;
    object *tmp;
    mapstruct *m;
 
    if(pl->type!=PLAYER) return 0;      /* only players use this skill */ 
    m = pl->map;
    mflags =get_map_flags(m, &m, x,y, &x, &y);
    if (mflags & P_OUT_OF_MAP) return 0;

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

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

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

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

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

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

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

    /* it's already allied! */ 
    if(QUERY_FLAG(tmp,FLAG_FRIENDLY)&&(tmp->attack_movement==PETMOVE)){  
        if(get_owner(tmp)==pl) {
            new_draw_info(NDI_UNIQUE, 0,pl, 
                      "Your follower loves your speech.\n");
            return 0;
        } else if (skill->level > tmp->level) {
            /* you steal the follower.  Perhaps we should really look at the
             * level of the owner above?
             */
            set_owner(tmp,pl);  
            new_draw_info_format(NDI_UNIQUE, 0,pl, 
                 "You convince the %s to follow you instead!\n",
                 query_name(tmp));
            /* Abuse fix - don't give exp since this can otherwise
             * be used by a couple players to gets lots of exp.
             */
            return 0;
        } else {
            /* In this case, you can't steal it from the other player */
            return 0;
        }
    } /* Creature was already a pet of someone */

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

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

        set_owner(tmp,pl);
        tmp->stats.exp = 0;
        add_friendly_object(tmp);
        SET_FLAG(tmp,FLAG_FRIENDLY);
        tmp->attack_movement = PETMOVE;
        return calc_skill_exp(pl,tmp, skill);
    }
    /* Charm failed.  Creature may be angry now */
    else if((skill->level+((pl->stats.Cha-10)/2)) < random_roll(1, 2*tmp->level, pl, PREFER_LOW)) {
        new_draw_info_format(NDI_UNIQUE, 0,pl, 
                  "Your speech angers the %s!\n",query_name(tmp)); 
        if(QUERY_FLAG(tmp,FLAG_FRIENDLY)) {
            CLEAR_FLAG(tmp,FLAG_FRIENDLY);
            remove_friendly_object(tmp);
            tmp->attack_movement = 0;   /* needed? */ 
        }
        CLEAR_FLAG(tmp,FLAG_UNAGGRESSIVE);
    }
    return 0;   /* Fall through - if we get here, we didn't charm anything */
}

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

int singing(object *pl, int dir, object *skill) {
    int i,exp = 0,chance, mflags;
    object *tmp;
    mapstruct *m;
    sint16  x, y;

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

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

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

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

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

            /* stealing isn't really related (although, maybe it should
             * be).  This is mainly to prevent singing to the same monster
             * over and over again and getting exp for it.
             */
            chance=skill->level*2+(pl->stats.Cha-5-tmp->stats.Int)/2;
            if(chance && tmp->level*2<random_roll(0, chance-1, pl, PREFER_HIGH)) {
                SET_FLAG(tmp,FLAG_UNAGGRESSIVE);
                new_draw_info_format(NDI_UNIQUE, 0,pl,
                     "You calm down the %s\n",query_name(tmp));
                /* Give exp only if they are not aware */
                if(!QUERY_FLAG(tmp,FLAG_NO_STEAL))
                    exp += calc_skill_exp(pl,tmp, skill);
                SET_FLAG(tmp,FLAG_NO_STEAL);
            } else { 
                 new_draw_info_format(NDI_UNIQUE, 0,pl,
                        "Too bad the %s isn't listening!\n",query_name(tmp));
                SET_FLAG(tmp,FLAG_NO_STEAL);
            }
        }
    }
    return exp;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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

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

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

    strcpy(buf,"You pray.");

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

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

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

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

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

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

    /* ok let's meditate!  Spell points are regained first, then once
     * they are maxed we get back hp. Actual incrementing of values
     * is handled by the do_some_living() (in player.c). This way magical
     * bonuses for healing/sp regeneration are included properly
     * No matter what, we will eat up some playing time trying to 
     * meditate. (see 'factor' variable for what sets the amount of time) 
     */
 
    new_draw_info(NDI_BLACK,0,pl, "You meditate."); 

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

/* write_note() - this routine allows players to inscribe messages in 
 * ordinary 'books' (anything that is type BOOK). b.t.
 */

static int write_note(object *pl, object *item, const char *msg, object *skill) {
    char buf[BOOK_BUF]; 
    object *newBook = NULL;

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

    if(!msg) { 
        new_draw_info(NDI_UNIQUE,0,pl,"No message to write!");
        new_draw_info_format(NDI_UNIQUE,0,pl,"Usage: use_skill %s <message>",
                     skill->skill);
        return 0;
    }
    if (strcasestr_local(msg, "endmsg")) {
        new_draw_info(NDI_UNIQUE,0,pl,"Trying to cheat now are we?");
        return 0;
    }

    /* Lauwenmark: Handle for plugin book writing (trigger) event */
    if (execute_event(item, EVENT_TRIGGER,pl,NULL,msg,SCRIPT_FIX_ALL)!=0)
            return strlen(msg);

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

        strcat(buf,msg);
        strcat(buf,"\n"); /* new msg needs a LF */
        if(item->nrof > 1) {
            newBook = get_object();
            copy_object(item, newBook);
            decrease_ob(item);
            esrv_send_item(pl, item);
            newBook->nrof = 1;
            if (newBook->msg) free_string(newBook->msg);
            newBook->msg = add_string(buf);
            newBook = insert_ob_in_ob(newBook, pl);
            esrv_send_item(pl, newBook);
        } else {
            if (item->msg) free_string(item->msg);
            item->msg=add_string(buf); 
            /* This shouldn't be necessary - the object hasn't changed in any
             * visible way
             */
            /*      esrv_send_item(pl, item);*/
        }
        new_draw_info_format(NDI_UNIQUE,0,pl, "You write in the %s.",
                             query_short_name(item));
        return strlen(msg);
    } else
        new_draw_info_format(NDI_UNIQUE,0,pl,
                             "Your message won't fit in the %s!",
                             query_short_name(item));

    return 0;
}

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

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

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

    /* Check if we are ready to attempt inscription */
    chosen_spell=pl->contr->ranges[range_magic];
    if(!chosen_spell) {
        new_draw_info(NDI_UNIQUE,0,pl,
              "You need a spell readied in order to inscribe!"); 
        return 0; 
    }
    if(SP_level_spellpoint_cost(pl,chosen_spell,SPELL_GRACE) > pl->stats.grace) {
        new_draw_info_format(NDI_UNIQUE,0,pl,
             "You don't have enough grace to write a scroll of %s.", 
                             chosen_spell->name);
        return 0;
    }
    if(SP_level_spellpoint_cost(pl,chosen_spell,SPELL_MANA) > pl->stats.sp) {
        new_draw_info_format(NDI_UNIQUE,0,pl,
             "You don't have enough mana to write a scroll of %s.", 
                             chosen_spell->name);
        return 0;
    }

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

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

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

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

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

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

        if (newscroll->inv) {
            object *ninv;

            ninv = newscroll->inv;
            remove_ob(ninv);
            free_object(ninv);
        }
        tmp = get_object();
        copy_object(chosen_spell, tmp);
        insert_ob_in_ob(tmp, newscroll);

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

        /* wait until finished manipulating the scroll before inserting it */
        if (newscroll != scroll)
            newscroll=insert_ob_in_ob(newscroll,pl);
        esrv_send_item(pl, newscroll);
        success = calc_skill_exp(pl,newscroll, skill);
        if(!confused) success *= 2;
    success = success * skill->level;
        return success; 

    } else { /* Inscription has failed */

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

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

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

    if (!params) {
        params="";
        string=params;
    }
    skat = get_archetype_by_type_subtype(SKILL, SK_LITERACY);

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

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

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

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

    if (msgtype == SCROLL) {
        return write_scroll(pl,item, skill);
    } else if (msgtype == BOOK) {
        return write_note(pl,item,string, skill);
    }
    return 0;
}


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

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

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

    /* look through the inventory */
    if (tmp == NULL) {
        for (tmp = op->inv; tmp != NULL; tmp = tmp->below) {
            /* can't toss invisible or inv-locked items */
            if (tmp->invisible || QUERY_FLAG(tmp, FLAG_INV_LOCKED))
                continue;
            if (!request
            || !strcmp(query_name(tmp), request)
            || !strcmp(tmp->name, request))
                break;
        }
    }
 
    /* this should prevent us from throwing away
     * cursed items, worn armour, etc. Only weapons
     * can be thrown from 'hand'.  
     */
    if (!tmp) return NULL;

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

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

/* make_throw_ob() We construct the 'carrier' object in
 * which we will insert the object that is being thrown.
 * This combination  becomes the 'thrown object'. -b.t.
 */

static object *make_throw_ob (object *orig) {
    object *toss_item;

    if(!orig) return NULL;

    toss_item=get_object();
    if (QUERY_FLAG (orig, FLAG_APPLIED)) {
        LOG (llevError, "BUG: make_throw_ob(): ob is applied\n");
        /* insufficient workaround, but better than nothing */
        CLEAR_FLAG (orig, FLAG_APPLIED);
    }
    copy_object(orig,toss_item);
    toss_item->type = THROWN_OBJ;
    CLEAR_FLAG(toss_item,FLAG_CHANGING);
    toss_item->stats.dam = 0; /* default damage */
    insert_ob_in_ob(orig,toss_item);
    return toss_item;
}


/* do_throw() - op throws any object toss_item. This code
 * was borrowed from fire_bow.
 * Returns 1 if skill was successfully used, 0 if not
 */

static int do_throw(object *op, object *part, object *toss_item, int dir, object *skill) {
    object *throw_ob=toss_item, *left=NULL;
    tag_t left_tag;
    int eff_str = 0,maxc,str=op->stats.Str,dam=0;
    int pause_f,weight_f=0, mflags;
    float str_factor=1.0,load_factor=1.0,item_factor=1.0;
    mapstruct *m;
    sint16  sx, sy;
    tag_t tag;

    if(throw_ob==NULL) {
        if(op->type==PLAYER) {
            new_draw_info(NDI_UNIQUE, 0,op,"You have nothing to throw.");
        }
        return 0;
    }
    if (QUERY_FLAG(throw_ob, FLAG_STARTEQUIP)) {
        if (op->type==PLAYER) {
            new_draw_info(NDI_UNIQUE, 0, op, "The gods won't let you throw that.");
        }
        return 0;
    }

    /* Because throwing effectiveness must be reduced by the
     * encumbrance of the thrower and weight of the object. THus,
     * we use the concept of 'effective strength' as defined below. 
     */
 
    /* if str exceeds MAX_STAT (30, eg giants), lets assign a str_factor > 1 */
    if(str>MAX_STAT) { 
        str_factor = (float) str /(float) MAX_STAT; str = MAX_STAT; 
    }
   
    /* the more we carry, the less we can throw. Limit only on players */
    maxc=max_carry[str]*1000;
    if(op->carrying>maxc&&op->type==PLAYER)
        load_factor = (float)maxc/(float) op->carrying;
 
    /* lighter items are thrown harder, farther, faster */
    if(throw_ob->weight>0) 
        item_factor = (float) maxc/(float) (3.0 * throw_ob->weight);
    else { /* 0 or negative weight?!? Odd object, can't throw it */
        new_draw_info_format(NDI_UNIQUE, 0,op,"You can't throw %s.\n",
                             query_name(throw_ob)); 
        return 0;
    }
   
    eff_str = str * (load_factor<1.0?load_factor:1.0);
    eff_str = (float) eff_str * item_factor * str_factor;
   
    /* alas, arrays limit us to a value of MAX_STAT (30). Use str_factor to
     * account for super-strong throwers. */
    if(eff_str>MAX_STAT) eff_str=MAX_STAT;

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

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

    if(!dir || (eff_str <= 1) || (mflags & P_OUT_OF_MAP) ||
       (GET_MAP_MOVE_BLOCK(m, sx, sy) & MOVE_FLY_LOW)) {

        /* bounces off 'wall', and drops to feet */
        remove_ob(throw_ob);
        throw_ob->x = part->x; throw_ob->y = part->y;
        insert_ob_in_map(throw_ob,part->map,op,0);
        if(op->type==PLAYER) {
            if(eff_str<=1) {
                new_draw_info_format(NDI_UNIQUE, 0,op,
                        "Your load is so heavy you drop %s to the ground.",
                        query_name(throw_ob));
            }
            else if(!dir) {
                new_draw_info_format(NDI_UNIQUE, 0,op,"You throw %s at the ground.",
                                     query_name(throw_ob));
            }
            else
                new_draw_info(NDI_UNIQUE, 0,op,"Something is in the way.");
        }
        return 0;
    } /* if object can't be thrown */
 
    left = throw_ob; /* these are throwing objects left to the player */
    left_tag = left->count;

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

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

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

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

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

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

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

    /* how far to fly */
    throw_ob->last_sp = (eff_str*3)/5;
     
    /* speed */
    throw_ob->speed = (speed_bonus[eff_str]+1.0)/1.5;
    throw_ob->speed = MIN(1.0,throw_ob->speed); /* no faster than an arrow! */
     
    /* item damage. Eff_str and item weight influence damage done */
    weight_f = (throw_ob->weight/2000)>MAX_STAT?MAX_STAT:(throw_ob->weight/2000);
    throw_ob->stats.dam += (dam/3) + dam_bonus[weight_f]
        + (throw_ob->weight/15000) - 2;

    /* chance of breaking. Proportional to force used and weight of item */
    throw_ob->stats.food = (dam/2) + (throw_ob->weight/60000);
     
    /* replace 25 with a call to clone.arch wc? messes up w/ NPC */
    throw_ob->stats.wc = 25 - dex_bonus[op->stats.Dex]
        - thaco_bonus[eff_str] - skill->level;
 

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

    if(QUERY_FLAG(throw_ob->inv,FLAG_IS_THROWN)) {
        throw_ob->last_sp += eff_str/3; /* fly a little further */
        throw_ob->stats.dam += throw_ob->inv->stats.dam + throw_ob->magic + 2;
        throw_ob->stats.wc -= throw_ob->magic + throw_ob->inv->stats.wc;
        /* only throw objects get directional faces */
        if(GET_ANIM_ID(throw_ob) && NUM_ANIMATIONS(throw_ob))
            SET_ANIMATION(throw_ob, dir);
    } else {
        /* some materials will adjust properties.. */
        if(throw_ob->material&M_LEATHER) {
            throw_ob->stats.dam -= 1;
            throw_ob->stats.food -= 10;
        }
        if(throw_ob->material&M_GLASS) throw_ob->stats.food += 60;
 
        if(throw_ob->material&M_ORGANIC) {
            throw_ob->stats.dam -= 3;
            throw_ob->stats.food += 55;
        }
        if(throw_ob->material&M_PAPER||throw_ob->material&M_CLOTH) {
            throw_ob->stats.dam -= 5; throw_ob->speed *= 0.8;
            throw_ob->stats.wc += 3; throw_ob->stats.food -= 30;
        }
        /* light obj have more wind resistance, fly slower*/
        if(throw_ob->weight>500) throw_ob->speed *= 0.8;
        if(throw_ob->weight>50) throw_ob->speed *= 0.5;
 
    } /* else tailor thrown object */
 
    /* some limits, and safeties (needed?) */
    if(throw_ob->stats.dam<0) throw_ob->stats.dam=0;
    if(throw_ob->last_sp>eff_str) throw_ob->last_sp=eff_str;
    if(throw_ob->stats.food<0) throw_ob->stats.food=0;
    if(throw_ob->stats.food>100) throw_ob->stats.food=100;
    if(throw_ob->stats.wc>30) throw_ob->stats.wc=30;

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

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

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

    update_ob_speed(throw_ob);
    throw_ob->speed_left = 0;
    throw_ob->map = part->map;

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

#if 0
    /* need to put in a good sound for this */
    play_sound_map(op->map, op->x, op->y, SOUND_THROW_OBJ);
#endif
/* Lauwenmark - Now we can call the associated script_throw event (if any) */
    execute_event(throw_ob, EVENT_THROW,op,NULL,NULL,SCRIPT_FIX_ACTIVATOR);
#ifdef DEBUG_THROW
    LOG(llevDebug," pause_f=%d \n",pause_f);
    LOG(llevDebug," %s stats: wc=%d dam=%d dist=%d spd=%f break=%d\n",
        throw_ob->name,throw_ob->stats.wc,throw_ob->stats.dam,
        throw_ob->last_sp,throw_ob->speed,throw_ob->stats.food);
    LOG(llevDebug,"inserting tossitem (%d) into map\n",throw_ob->count);
#endif
    tag = throw_ob->count;
    insert_ob_in_map(throw_ob,part->map,op,0);
    if (!was_destroyed (throw_ob, tag))
        move_arrow(throw_ob);
    return 1;
}

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

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

    return do_throw(op,part, throw_ob,dir, skill);
}
Revision:	1.1.1.1 (vendor branch)
Committed:	Fri Feb 3 07:14:38 2006 UTC (18 years, 3 months ago) by root
Content type:	text/plain
Branch:	UPSTREAM
CVS Tags:	UPSTREAM_2006_02_22, UPSTREAM_2006_02_03
Changes since 1.1:	+0 -0 lines
Log Message:	initial import