skill_util.c

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/*
 * static char *rcsid_skill_util_c =
 *   "$Id: skill_util.c 11578 2009-02-23 22:02:27Z lalo $";
 */
/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2006 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 author can be reached via e-mail to crossfire-devel@real-time.com
*/

/* define the following for skills utility debuging */
/* #define SKILL_UTIL_DEBUG */

#define WANT_UNARMED_SKILLS

#include <global.h>
#include <object.h>
#ifndef __CEXTRACT__
#include <sproto.h>
#endif
#include <living.h>     /* for defs of STR,CON,DEX,etc. -b.t.*/
#include <spells.h>

static int attack_hth(object *pl, int dir, const char *string, object *skill);
static int attack_melee_weapon(object *op, int dir, const char *string, object *skill);

const char *skill_names[NUM_SKILLS];

void init_skills(void) {
    int i;
    archetype *at;

    for (i = 0; i < NUM_SKILLS; i++)
        skill_names[i] = NULL;

    for (at = first_archetype; at != NULL; at = at->next) {
        if (at->clone.type == SKILL) {
            if (at->clone.subtype >= sizeof(skill_names)/sizeof(*skill_names)) {
                LOG(llevError, "init_skills: invalid skill subtype %d for skill %s\n", at->clone.subtype, at->clone.skill);
            } else if (skill_names[at->clone.subtype] != NULL) {
                LOG(llevError, "init_skills: multiple skill using same subtype %d, %s, %s\n",
                    at->clone.subtype, skill_names[at->clone.subtype], at->clone.skill);
            } else {
                skill_names[at->clone.subtype] = add_refcount(at->clone.skill);
            }
        }
    }

    /* This isn't really an error if there is no skill subtype set, but
     * checking for this may catch some user errors.
     * On the other hand, it'll crash later on, which is not nice. Thus giving a dummy name.
     */
    for (i = 1; i < NUM_SKILLS; i++) {
        if (!skill_names[i]) {
            LOG(llevError, "init_skills: skill subtype %d doesn't have a name?\n", i);
            skill_names[i] = add_string("dummy skill");
        }
    }
}

void link_player_skills(object *op) {
    object *tmp;

    for (tmp = op->inv; tmp; tmp = tmp->below) {
        if (tmp->type == SKILL) {
            /* This is really a warning, hence no else below */
            if (op->contr->last_skill_ob[tmp->subtype] && op->contr->last_skill_ob[tmp->subtype] != tmp) {
                LOG(llevError, "Multiple skills with the same subtype? %s, %s\n", op->contr->last_skill_ob[tmp->subtype]->skill, tmp->skill);
            }
            if (tmp->subtype >= NUM_SKILLS) {
                LOG(llevError, "Invalid subtype number %d (range 0-%d)\n", tmp->subtype, NUM_SKILLS);
            } else {
                op->contr->last_skill_ob[tmp->subtype] = tmp;
                op->contr->last_skill_exp[tmp->subtype] = -1;
            }
        }
    }
}

static object *adjust_skill_tool(object *who, object *skill, object *skill_tool) {
    if (!skill && !skill_tool)
        return NULL;

    /* If this is a skill that can be used without a tool and no tool found, return it */
    if (skill && QUERY_FLAG(skill, FLAG_CAN_USE_SKILL) && (!skill_tool || QUERY_FLAG(skill_tool, FLAG_APPLIED) || strcmp(skill->skill, "clawing")  == 0))
        return skill;

    /* Player has a tool to use the skill.  If not applied, apply it -
     * if not successful, return skill if can be used.  If they do have the skill tool
     * but not the skill itself, give it to them.
     */
    if (skill_tool) {
        if (!QUERY_FLAG(skill_tool, FLAG_APPLIED)) {
            if (apply_special(who, skill_tool, 0)) {
                if (skill && QUERY_FLAG(skill, FLAG_CAN_USE_SKILL))
                    return skill;
                else
                    return NULL;
            }
        }
        if (!skill) {
            skill = give_skill_by_name(who, skill_tool->skill);
            link_player_skills(who);
        }
        return skill;
    }
    if (skill && QUERY_FLAG(skill, FLAG_CAN_USE_SKILL))
        return skill;
    else
        return NULL;
}

object *find_skill_by_name(object *who, const char *name) {
    object *skill = NULL, *skill_tool = NULL, *tmp;

    if (!name)
        return NULL;

    /* We make sure the length of the string in the object is greater
     * in length than the passed string. Eg, if we have a skill called
     * 'hi', we don't want to match if the user passed 'high'
     */
    for (tmp = who->inv; tmp != NULL; tmp = tmp->below) {
        if (tmp->type == SKILL
        && !strncasecmp(name, tmp->skill, strlen(name))
        && strlen(tmp->skill) >= strlen(name))
            skill = tmp;

        /* Try to find appropriate skilltool.  If the player has one already
         * applied, we try to keep using that one.
         */
        else if (tmp->type == SKILL_TOOL
        && !strncasecmp(name, tmp->skill, strlen(name))
        && strlen(tmp->skill) >= strlen(name)) {
            if (QUERY_FLAG(tmp, FLAG_APPLIED))
                skill_tool = tmp;
            else if (!skill_tool || !QUERY_FLAG(skill_tool, FLAG_APPLIED))
                skill_tool = tmp;
        }
    }

    return adjust_skill_tool(who, skill, skill_tool);
}

object *find_skill_by_number(object *who, int skillno) {
    object *skill = NULL, *skill_tool = NULL, *tmp;

    if (skillno < 1 || skillno >= NUM_SKILLS)
        return NULL;

    for (tmp = who->inv; tmp != NULL; tmp = tmp->below) {
        if (tmp->type == SKILL && tmp->subtype == skillno)
            skill = tmp;

        /* Try to find appropriate skilltool.  If the player has one already
         * applied, we try to keep using that one.
         */
        else if (tmp->type == SKILL_TOOL && tmp->subtype == skillno) {
            if (QUERY_FLAG(tmp, FLAG_APPLIED))
                skill_tool = tmp;
            else if (!skill_tool || !QUERY_FLAG(skill_tool, FLAG_APPLIED))
                skill_tool = tmp;
        }
    }

    return adjust_skill_tool(who, skill, skill_tool);
}

int change_skill(object *who, object *new_skill, int flag) {
    int old_range;

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

    old_range = who->contr->shoottype;

    if (who->chosen_skill && who->chosen_skill == new_skill) {
        /* optimization for changing skill to current skill */
        if (who->type == PLAYER && !(flag&0x1))
            who->contr->shoottype = range_skill;
        return 1;
    }

    if (!new_skill || who->chosen_skill)
        if (who->chosen_skill)
            apply_special(who, who->chosen_skill, AP_UNAPPLY|(flag&AP_NOPRINT));

    /* Only goal in this case was to unapply a skill */
    if (!new_skill)
        return 0;

    if (apply_special(who, new_skill, AP_APPLY|(flag&AP_NOPRINT))) {
        return 0;
    }
    if (flag&0x1)
        who->contr->shoottype = old_range;

    return 1;
}

void clear_skill(object *who) {
    who->chosen_skill = NULL;
    CLEAR_FLAG(who, FLAG_READY_SKILL);
    if (who->type == PLAYER) {
        who->contr->ranges[range_skill] = NULL;
        if (who->contr->shoottype == range_skill)
            who->contr->shoottype = range_none;
    }
}

int do_skill(object *op, object *part, object *skill, int dir, const char *string) {
    int success = 0, exp = 0;
    object *tmp;

    if (!skill)
        return 0;

    /* The code below presumes that the skill points to the object that
     * holds the exp, level, etc of the skill.  So if this is a player
     * go and try to find the actual real skill pointer, and if the
     * the player doesn't have a bucket for that, create one.
     */
    if (skill->type != SKILL && op->type == PLAYER) {
        for (tmp = op->inv; tmp != NULL; tmp = tmp->below) {
            if (tmp->type == SKILL && tmp->skill == skill->skill)
                break;
        }
        if (!tmp)
            tmp = give_skill_by_name(op, skill->skill);
        skill = tmp;
    }

    if (skill->anim_suffix)
        apply_anim_suffix(op, skill->anim_suffix);

    switch (skill->subtype) {
    case SK_LEVITATION:
        /* Not 100% sure if this will work with new movement code -
         * the levitation skill has move_type for flying, so when
         * equipped, that should transfer to player, when not,
         * shouldn't.
         */
        if (QUERY_FLAG(skill, FLAG_APPLIED)) {
            CLEAR_FLAG(skill, FLAG_APPLIED);
            draw_ext_info(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_SUCCESS,
                          "You come to earth.", NULL);
        } else {
            SET_FLAG(skill, FLAG_APPLIED);
            draw_ext_info(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_SUCCESS,
                          "You rise into the air!.", NULL);
        }
        fix_object(op);
        success = 1;
        break;

    case SK_STEALING:
        exp = success = steal(op, dir, skill);
        break;

    case SK_LOCKPICKING:
        exp = success = pick_lock(op, dir, skill);
        break;

    case SK_HIDING:
        exp = success = hide(op, skill);
        break;

    case SK_JUMPING:
        success = jump(op, dir, skill);
        break;

    case SK_INSCRIPTION:
        exp = success = write_on_item(op, string, skill);
        break;

    case SK_MEDITATION:
        meditate(op, skill);
        success = 1;
        break;
        /* note that the following 'attack' skills gain exp through hit_player() */

    case SK_KARATE:
        (void)attack_hth(op, dir, "karate-chopped", skill);
        break;

    case SK_PUNCHING:
        (void)attack_hth(op, dir, "punched", skill);
        break;

    case SK_FLAME_TOUCH:
        (void)attack_hth(op, dir, "flamed", skill);
        break;

    case SK_CLAWING:
        (void)attack_hth(op, dir, "clawed", skill);
        break;

    case SK_WRAITH_FEED:
        (void)attack_hth(op, dir, "fed upon", skill);
        break;

    case SK_ONE_HANDED_WEAPON:
    case SK_TWO_HANDED_WEAPON:
        (void)attack_melee_weapon(op, dir,  NULL, skill);
        break;

    case SK_FIND_TRAPS:
        exp = success = find_traps(op, skill);
        break;

    case SK_SINGING:
        exp = success = singing(op, dir, skill);
        break;

    case SK_ORATORY:
        exp = success = use_oratory(op, dir, skill);
        break;

    case SK_SMITHERY:
    case SK_BOWYER:
    case SK_JEWELER:
    case SK_ALCHEMY:
    case SK_THAUMATURGY:
    case SK_LITERACY:
    case SK_WOODSMAN:
        if (use_alchemy(op) == 0)
            exp = success = skill_ident(op, skill);
        break;

    case SK_DET_MAGIC:
    case SK_DET_CURSE:
        exp = success = skill_ident(op, skill);
        break;

    case SK_DISARM_TRAPS:
        exp = success = remove_trap(op, skill);
        break;

    case SK_THROWING:
        success = skill_throw(op, part, dir, string, skill);
        break;

    case SK_SET_TRAP:
        draw_ext_info(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_ERROR,
                      "This skill is not currently implemented.", NULL);
        break;

    case SK_USE_MAGIC_ITEM:
    case SK_MISSILE_WEAPON:
        draw_ext_info(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_ERROR,
                      "There is no special attack for this skill.", NULL);
        break;

    case SK_PRAYING:
        success = pray(op, skill);
        break;

    case SK_BARGAINING:
        success = describe_shop(op);
        break;

    case SK_SORCERY:
    case SK_EVOCATION:
    case SK_PYROMANCY:
    case SK_SUMMONING:
    case SK_CLIMBING:
        draw_ext_info(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_ERROR,
                      "This skill is already in effect.", NULL);
        break;

    case SK_HARVESTING:
        success = do_harvest(op, dir, skill);
        break;

    default: {
            char name[MAX_BUF];

            query_name(op, name, MAX_BUF);
            LOG(llevDebug, "%s attempted to use unknown skill: %d\n", name, op->chosen_skill->stats.sp);
            break;
        }
    }

    /* For players we now update the speed_left from using the skill.
     * Monsters have no skill use time because of the random nature in
     * which use_monster_skill is called already simulates this.
     * If certain skills should take more/less time, that should be
     * in the code for the skill itself.
     */

    if (op->type == PLAYER)
        op->speed_left -= 1.0;

    /* this is a good place to add experience for successfull use of skills.
     * Note that add_exp() will figure out player/monster experience
     * gain problems.
     */

    if (success && exp)
        change_exp(op, exp, skill->skill, SK_SUBTRACT_SKILL_EXP);

    return success;
}

sint64 calc_skill_exp(object *who, object *op, object *skill) {
    sint64 op_exp = 0;
    int op_lvl = 0;
    float base, value, lvl_mult = 0.0;

    if (!skill)
        skill = who;

    /* Oct 95 - where we have an object, I expanded our treatment
     * to 3 cases:
     * non-living magic obj, runes and everything else.
     *
     * If an object is not alive and magical we set the base exp higher to
     * help out exp awards for skill_ident skills. Also, if
     * an item is type RUNE, we give out exp based on stats.Cha
     * and level (this was the old system) -b.t.
     */

    if (!op) {  /* no item/creature */
        op_lvl = MAX(who->map->difficulty, 1);
        op_exp = 0;
    } else if (op->type == RUNE || op->type == TRAP) { /* all traps. If stats.Cha > 1 we use that
     * for the amount of experience */
        op_exp = op->stats.Cha > 1 ? op->stats.Cha : op->stats.exp;
        op_lvl = op->level;
    } else {   /* all other items/living creatures */
        op_exp = op->stats.exp;
        op_lvl = op->level;
        if (!QUERY_FLAG(op, FLAG_ALIVE)) { /* for ident/make items */
            op_lvl += 5*abs(op->magic);
        }
    }

    if (op_lvl < 1)
        op_lvl = 1;

    if (who->type != PLAYER) {            /* for monsters only */
        return ((sint64)(op_exp*0.1)+1);  /* we add one to insure positive value is returned */
    } else {                            /* for players */
        base = op_exp;
        /* if skill really is a skill, then we can look at the skill archetype for
         * bse reward value (exp) and level multiplier factor.
         */
        if (skill->type == SKILL) {
            base += skill->arch->clone.stats.exp;
            if (settings.simple_exp) {
                if (skill->arch->clone.level)
                    lvl_mult = (float)skill->arch->clone.level/100.0;
                else
                    lvl_mult = 1.0; /* no adjustment */
            } else {
                if (skill->level)
                    lvl_mult = ((float)skill->arch->clone.level*(float)op_lvl)/((float)skill->level*100.0);
                else
                    lvl_mult = 1.0;
            }
        } else {
            /* Don't divide by zero here! */
            lvl_mult = (float)op_lvl/(float)(skill->level ? skill->level : 1);
        }
    }

    /* assemble the exp total, and return value */

    value =  base*lvl_mult;
    if (value < 1)
        value = 1; /* Always give at least 1 exp point */

#ifdef SKILL_UTIL_DEBUG
    LOG(llevDebug, "calc_skill_exp(): who: %s(lvl:%d)  op:%s(lvl:%d)\n", who->name, skill->level, op->name, op_lvl);
#endif
    return ((sint64)value);
}

int learn_skill(object *pl, object *scroll) {
    object *tmp;

    if (!scroll->skill) {
        LOG(llevError, "skill scroll %s does not have skill pointer set.\n", scroll->name);
        return 2;
    }

    /* can't use find_skill_by_name because we want skills the player knows
     * but can't use natively.
     */

    for (tmp = pl->inv; tmp != NULL; tmp = tmp->below)
        if (tmp->type == SKILL && !strncasecmp(scroll->skill, tmp->skill, strlen(scroll->skill)))
            break;

    /* player already knows it */
    if (tmp && QUERY_FLAG(tmp, FLAG_CAN_USE_SKILL))
        return 0;

    /* now a random change to learn, based on player Int.
     * give bonus based on level - otherwise stupid characters
     * might never be able to learn anything.
     */
    if (random_roll(0, 99, pl, PREFER_LOW) > (learn_spell[pl->stats.Int]+(pl->level/5)))
        return 2; /* failure :< */

    if (!tmp)
        tmp = give_skill_by_name(pl, scroll->skill);

    if (!tmp) {
        LOG(llevError, "skill scroll %s does not have valid skill name (%s).\n", scroll->name, scroll->skill);
        return 2;
    }

    SET_FLAG(tmp, FLAG_CAN_USE_SKILL);
    link_player_skills(pl);
    return 1;
}

static int clipped_percent(sint64 a, sint64 b) {
    int rv;

    if (b <= 0)
        return 0;

    rv = (int)((100.0f*((float)a)/((float)b))+0.5f);

    if (rv < 0)
        return 0;
    else if (rv > 100)
        return 100;

    return rv;
}

void show_skills(object *op, const char *search) {
    object *tmp = NULL;
    char buf[MAX_BUF];
    const char *cp;
    int i, num_skills_found = 0;
    static const char *const periods = "........................................";
    /* Need to have a pointer and use strdup for qsort to work properly */
    char skills[NUM_SKILLS][MAX_BUF];

    for (tmp = op->inv; tmp != NULL; tmp = tmp->below) {
        if (tmp->type == SKILL) {
            if (search && strstr(tmp->name, search) == NULL)
                continue;
            /* Basically want to fill this out to 40 spaces with periods */
            snprintf(buf, sizeof(buf), "%s%s", tmp->name, periods);
            buf[40] = 0;

            if (settings.permanent_exp_ratio) {
                snprintf(skills[num_skills_found++], MAX_BUF, "%slvl:%3d (xp:%"FMT64"/%"FMT64"/%d%%)",
                         buf, tmp->level,
                         tmp->stats.exp,
                         level_exp(tmp->level+1, op->expmul),
                         clipped_percent(tmp->perm_exp, tmp->stats.exp));
            } else {
                snprintf(skills[num_skills_found++], MAX_BUF, "%slvl:%3d (xp:%"FMT64"/%"FMT64")",
                         buf, tmp->level,
                         tmp->stats.exp,
                         level_exp(tmp->level+1, op->expmul));
            }
            /* I don't know why some characters get a bunch of skills, but
             * it sometimes happens (maybe a leftover from bugier earlier code
             * and those character are still about).  In any case, lets handle
             * it so it doesn't crash the server - otherwise, one character may
             * crash the server numerous times.
             */
            if (num_skills_found >= NUM_SKILLS) {
                draw_ext_info(NDI_RED, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_ERROR,
                              "Your character has too many skills. "
                              "Something isn't right - contact the server admin", NULL);
                break;
            }
        }
    }

    draw_ext_info(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_LIST,
                  "Player skills:", NULL);

    if (num_skills_found > 1)
        qsort(skills, num_skills_found, MAX_BUF, (int (*)(const void *, const void *))strcmp);

    for (i = 0; i < num_skills_found; i++) {
        draw_ext_info(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_LIST,
                      skills[i], skills[i]);
    }

    draw_ext_info_format(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_LIST,
                         "You can handle %d weapon improvements.",
                         "You can handle %d weapon improvements.",
                         op->level/5+5);

    cp = determine_god(op);
    if (strcmp(cp, "none") == 0)
        cp = NULL;
    draw_ext_info_format(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_LIST,
                         "You worship %s.",
                         "You worship %s.",
                         cp ? cp : "no god at current time");

    draw_ext_info_format(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_LIST,
                         "Your equipped item power is %d out of %d\n",
                         "Your equipped item power is %d out of %d\n",
                         op->contr->item_power, op->level);
}

int use_skill(object *op, const char *string) {
    object *skop;
    size_t len;

    if (!string)
        return 0;

    for (skop = op->inv; skop != NULL; skop = skop->below) {
        if (skop->type == SKILL
        && QUERY_FLAG(skop, FLAG_CAN_USE_SKILL)
        && !strncasecmp(string, skop->skill, MIN(strlen(string), strlen(skop->skill))))
            break;
        else if (skop->type == SKILL_TOOL
        && !strncasecmp(string, skop->skill, MIN(strlen(string), strlen(skop->skill))))
            break;
    }
    if (!skop) {
        draw_ext_info_format(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_MISSING,
                             "Unable to find skill %s",
                             "Unable to find skill %s",
                             string);
        return 0;
    }

    len = strlen(skop->skill);

    /* All this logic goes and skips over the skill name to find any
     * options given to the skill.  Its pretty simple - if there
     * are extra parameters (as deteremined by string length), we
     * want to skip over any leading spaces.
     */
    if (len >= strlen(string)) {
        string = NULL;
    } else {
        string += len;
        while (*string == 0x20)
            string++;
        if (strlen(string) == 0)
            string = NULL;
    }

#ifdef SKILL_UTIL_DEBUG
    LOG(llevDebug, "use_skill() got skill: %s\n", sknum > -1 ? skills[sknum].name : "none");
#endif

    /* Change to the new skill, then execute it. */
    if (do_skill(op, op, skop, op->facing, string))
        return 1;

    return 0;
}

static object *find_best_player_hth_skill(object *op) {
    object *tmp, *best_skill = NULL;
    int dragon = is_dragon_pl(op), last_skill = sizeof(unarmed_skills), i;

    /* Dragons are a special case - gros 25th July 2006 */
    if (dragon) {
        tmp = find_skill_by_number(op, SK_CLAWING);
        if (tmp) /* I suppose it should always be true - but maybe there's
                  * draconic toothache ? :) */
            return tmp;
    }
    for (tmp = op->inv; tmp; tmp = tmp->below) {
        if (tmp->type == SKILL) {

            /* The order in the array is preferred order.  So basically,
             * we just cut down the number to search - eg, if we find a skill
             * early on in flame touch, then we only need to look into the unarmed_array
             * to the entry before flame touch - don't care about the entries afterward,
             * because they are infrerior skills.
             * if we end up finding the best skill (i==0) might as well return
             * right away - can't get any better than that.
             */
            for (i = 0; i < last_skill; i++) {
                if (tmp->subtype == unarmed_skills[i] && QUERY_FLAG(tmp, FLAG_CAN_USE_SKILL)) {
                    best_skill = tmp;
                    last_skill = i;
                    if (i == 0)
                        return best_skill;
                }
            }
        }
    }
    return best_skill;
}

static int do_skill_attack(object *tmp, object *op, const char *string, object *skill) {
    int success;

    /* For Players only: if there is no ready weapon, and no "attack" skill
     * is readied either then try to find a skill for the player to use.
     * it is presumed that if skill is set, it is a valid attack skill (eg,
     * the caller should have set it appropriately).  We still want to pass
     * through that code if skill is set to change to the skill.
     */
    if (op->type == PLAYER) {
        if (!QUERY_FLAG(op, FLAG_READY_WEAPON)) {
            size_t i;

            if (!skill) {
                /* See if the players chosen skill is a combat skill, and use
                 * it if appropriate.
                 */
                if (op->chosen_skill) {
                    for (i = 0; i < sizeof(unarmed_skills); i++)
                        if (op->chosen_skill->subtype == unarmed_skills[i]) {
                            skill = op->chosen_skill;
                            break;
                        }
                }
                /* If we didn't find a skill above, look harder for a good skill */
                if (!skill) {
                    skill = find_best_player_hth_skill(op);

                    if (!skill) {
                        draw_ext_info(NDI_BLACK, 0, op,
                                      MSG_TYPE_SKILL, MSG_TYPE_SKILL_MISSING,
                                      "You have no unarmed combat skills!", NULL);
                        return 0;
                    }
                }
            }
            if (skill != op->chosen_skill) {
                /* now try to ready the new skill */
                if (!change_skill(op, skill, 1)) { /* oh oh, trouble! */
                    draw_ext_info_format(NDI_UNIQUE, 0, tmp,
                                         MSG_TYPE_SKILL, MSG_TYPE_SKILL_ERROR,
                                         "Couldn't change to skill %s",
                                         "Couldn't change to skill %s",
                                         skill->name);
                    return 0;
                }
            }
        } else {
            /* Seen some crashes below where current_weapon is not set,
             * even though the flag says it is.  So if current weapon isn't set,
             * do some work in trying to find the object to use.
             */
            if (!op->current_weapon) {
                object *tmp;

                LOG(llevError, "Player %s does not have current weapon set but flag_ready_weapon is set\n", op->name);
                for (tmp = op->inv; tmp; tmp = tmp->below)
                    if (tmp->type == WEAPON && QUERY_FLAG(tmp, FLAG_APPLIED))
                        break;

                if (!tmp) {
                    LOG(llevError, "Could not find applied weapon on %s\n", op->name);
                    op->current_weapon = NULL;
                    return 0;
                } else {
                    char weapon[MAX_BUF];

                    query_name(tmp, weapon, MAX_BUF);
                    op->current_weapon = tmp;
                }
            }

            /* Has ready weapon - make sure chosen_skill is set up properly */
            if (!op->chosen_skill || op->current_weapon->skill != op->chosen_skill->skill) {
                change_skill(op, find_skill_by_name(op, op->current_weapon->skill), 1);
            }
        }
    }

    /* lose invisiblity/hiding status for running attacks */

    if (op->type == PLAYER && op->contr->tmp_invis) {
        op->contr->tmp_invis = 0;
        op->invisible = 0;
        op->hide = 0;
        update_object(op, UP_OBJ_FACE);
    }

    success = attack_ob(tmp, op);

    /* print appropriate  messages to the player */

    if (success && string != NULL && tmp && !QUERY_FLAG(tmp, FLAG_FREED)) {
        char op_name[MAX_BUF];
        if(op->type==PLAYER) {
        query_name(tmp, op_name, MAX_BUF);
            draw_ext_info_format(NDI_UNIQUE, 0,op,
                         MSG_TYPE_ATTACK, MSG_TYPE_ATTACK_DID_HIT,
                         "You %s %s!",
                         "You %s %s!",
                         string,op_name);
    }
        else if(tmp->type==PLAYER) {
        query_name(op, op_name, MAX_BUF);
            draw_ext_info_format(NDI_UNIQUE, 0,tmp,
                         MSG_TYPE_VICTIM, MSG_TYPE_VICTIM_WAS_HIT,
                         "%s %s you!",
                         "%s %s you!",
                         op_name,string);
    }
    }
    return success;
}

int skill_attack(object *tmp, object *pl, int dir, const char *string, object *skill) {
    sint16 tx, ty;
    mapstruct *m;
    int mflags;

    if (!dir)
        dir = pl->facing;
    tx = freearr_x[dir];
    ty = freearr_y[dir];

    /* If we don't yet have an opponent, find if one exists, and attack.
     * Legal opponents are the same as outlined in move_player_attack()
     */

    if (tmp == NULL) {
        m = pl->map;
        tx = pl->x+freearr_x[dir];
        ty = pl->y+freearr_y[dir];

        mflags = get_map_flags(m, &m, tx, ty, &tx, &ty);
        if (mflags&P_OUT_OF_MAP)
            return 0;

        /* space must be blocked for there to be anything interesting to do */
        if (!(mflags&P_IS_ALIVE)
        && !OB_TYPE_MOVE_BLOCK(pl, GET_MAP_MOVE_BLOCK(m, tx, ty))) {
            return 0;
        }

        for (tmp = GET_MAP_OB(m, tx, ty); tmp; tmp = tmp->above)
            if ((QUERY_FLAG(tmp, FLAG_ALIVE) && tmp->stats.hp >= 0)
            || QUERY_FLAG(tmp, FLAG_CAN_ROLL)
            || tmp->type == LOCKED_DOOR) {
                /* Don't attack party members */
                if ((pl->type == PLAYER && tmp->type == PLAYER)
                && (pl->contr->party != NULL && pl->contr->party == tmp->contr->party))
                    return 0;
                break;
            }
    }
    if (!tmp) {
        if (pl->type == PLAYER)
            draw_ext_info(NDI_UNIQUE, 0, pl, MSG_TYPE_SKILL, MSG_TYPE_SKILL_FAILURE,
                          "There is nothing to attack!", NULL);
        return 0;
    }

    return do_skill_attack(tmp, pl, string, skill);
}

static int attack_hth(object *pl, int dir, const char *string, object *skill) {
    object *enemy = NULL, *weapon;

    if (QUERY_FLAG(pl, FLAG_READY_WEAPON))
        for (weapon = pl->inv; weapon; weapon = weapon->below) {
            if (weapon->type == WEAPON && QUERY_FLAG(weapon, FLAG_APPLIED)) {
                if (apply_special(pl, weapon, AP_UNAPPLY|AP_NOPRINT)) {
                    char weaponname[MAX_BUF];

                    query_name(weapon, weaponname, MAX_BUF);
                    draw_ext_info_format(NDI_UNIQUE, 0, pl,
                                         MSG_TYPE_SKILL, MSG_TYPE_SKILL_ERROR,
                                         "You are unable to unwield %s in order to attack with %s.",
                                         "You are unable to unwield %s in order to attack with %s.",
                                         weaponname, skill->name);
                    return 0;
                } else {
                    draw_ext_info(NDI_UNIQUE, 0, pl, MSG_TYPE_SKILL, MSG_TYPE_SKILL_ERROR,
                                  "You unwield your weapon in order to attack.", NULL);
                    break;
                }
            }
        }
    return skill_attack(enemy, pl, dir, string, skill);
}

static int attack_melee_weapon(object *op, int dir, const char *string, object *skill) {
    if (!QUERY_FLAG(op, FLAG_READY_WEAPON)) {
        if (op->type == PLAYER)
            draw_ext_info(NDI_UNIQUE, 0, op, MSG_TYPE_SKILL, MSG_TYPE_SKILL_ERROR,
                          "You have no ready weapon to attack with!", NULL);
        return 0;
    }
    return skill_attack(NULL, op, dir, string, skill);
}