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shop.c File Reference
#include "global.h"
#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "shop.h"
#include "sproto.h"
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Go to the source code of this file.

Macros

#define DISAPPROVAL_RATIO   0.2
 
#define LARGEST_COIN_GIVEN   2
 
#define MAX_BUY_REDUCTION   0.1f
 
#define MAX_SELL_EXTRA   0.1f
 
#define NEUTRAL_RATIO   0.8
 
#define NUM_COINS   5
 
#define SPECIALISATION_EFFECT   0.5
 

Functions

static void add_value (object *coin_objs[], int64_t value)
 
int can_pay (object *pl)
 
static uint64_t compute_price_variation_with_bargaining (object *pl, uint64_t price, float max_variation)
 
static bool coords_in_shop (mapstruct *map, int x, int y)
 
char * cost_approx_str (const object *tmp, object *who)
 
char * cost_str (uint64_t cost)
 
char * cost_string_from_value (uint64_t cost, int largest_coin)
 
static void count_unpaid (object *pl, object *item, int *unpaid_count, uint64_t *unpaid_price, uint32_t *coincount)
 
static archetypefind_next_coin (uint64_t c, int *cointype)
 
static void insert_objects (object *pl, object *container, object *objects[], int objects_len)
 
int pay_for_amount (uint64_t to_pay, object *pl)
 
int pay_for_item (object *op, object *pl, uint64_t reduction)
 
static uint64_t pay_from_container (object *pl, object *pouch, uint64_t to_pay)
 
uint64_t price_approx (const object *tmp, object *who)
 
uint64_t price_base (const object *obj)
 
uint64_t query_money (const object *op)
 
static StringBufferreal_money_value (const object *coin, StringBuffer *buf)
 
static int64_t remove_value (object *coin_objs[], int64_t remain)
 
void sell_item (object *op, object *pl)
 
double shop_approval (const mapstruct *map, const object *player)
 
static float shop_buy_multiplier (int charisma)
 
bool shop_contains (object *ob)
 
int shop_describe (const object *op)
 
static double shop_greed (const mapstruct *map)
 
int shop_pay_unpaid (object *pl, object *op)
 
uint64_t shop_price_buy (const object *tmp, object *who)
 
uint64_t shop_price_sell (const object *tmp, object *who)
 
static double shop_specialisation_ratio (const object *item, const mapstruct *map)
 
static uint64_t value_limit (uint64_t val, int quantity, const object *who, int isshop)
 

Variables

static const char *const coins []
 

Detailed Description

Those functions deal with shop handling, bargaining, things like that.

Todo:
isn't there redundance with pay_for_item(), get_payment(), pay_for_amount()?

Definition in file shop.c.

Macro Definition Documentation

◆ DISAPPROVAL_RATIO

#define DISAPPROVAL_RATIO   0.2

Price a shopkeeper will give to someone they disapprove of.

Definition at line 42 of file shop.c.

◆ LARGEST_COIN_GIVEN

#define LARGEST_COIN_GIVEN   2

Never give amber or jade, but accept them

Definition at line 59 of file shop.c.

◆ MAX_BUY_REDUCTION

#define MAX_BUY_REDUCTION   0.1f

Maximum price reduction when buying an item with bargaining skill.

Definition at line 48 of file shop.c.

◆ MAX_SELL_EXTRA

#define MAX_SELL_EXTRA   0.1f

Maximum price increase when selling an item with bargaining skill.

Definition at line 50 of file shop.c.

◆ NEUTRAL_RATIO

#define NEUTRAL_RATIO   0.8

Price a shopkeeper will give someone they neither like nor dislike

Definition at line 45 of file shop.c.

◆ NUM_COINS

#define NUM_COINS   5

Number of coin types

Definition at line 57 of file shop.c.

◆ SPECIALISATION_EFFECT

#define SPECIALISATION_EFFECT   0.5

This is a measure of how effective store specialisation is. A general store will offer this proportion of the 'maximum' price, a specialised store will offer a range of prices around it such that the maximum price is always one therefore making this number higher, makes specialisation less effective. setting this value above 1 or to a negative value would have interesting, (though not useful) effects.

Definition at line 39 of file shop.c.

Function Documentation

◆ add_value()

static void add_value ( object coin_objs[],
int64_t  value 
)
static

This function adds a given amount to a list of coins.

Parameters
coin_objsthe list coins to add to; the list must be ordered from least to most valuable coin
valuethe value (in silver coins) to add

Definition at line 623 of file shop.c.

References LARGEST_COIN_GIVEN, obj::nrof, NUM_COINS, autojail::value, and obj::value.

Referenced by pay_from_container().

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◆ can_pay()

int can_pay ( object pl)

Checks all unpaid items in op's inventory, adds up all the money they have, and checks that they can actually afford what they want to buy. Prints appropriate messages to the player.

Parameters
plplayer trying to bug.
Return values
1player could buy the items.
0some items can't be bought.

Definition at line 830 of file shop.c.

References archininventory::arch, buf, coins, cost_str(), count_unpaid(), draw_ext_info(), find_archetype(), llevError, LOG(), make_list_like(), MAX_BUF, MSG_TYPE_SHOP, MSG_TYPE_SHOP_PAYMENT, NDI_UNIQUE, NUM_COINS, PLAYER, query_money(), and autojail::value.

Referenced by cfapi_player_can_pay(), and shop_mat_type_move_on().

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◆ compute_price_variation_with_bargaining()

static uint64_t compute_price_variation_with_bargaining ( object pl,
uint64_t  price,
float  max_variation 
)
static

Compute a percent of the price which will be used as extra or reduction. This will be 0 if the player doesn't have the bargaining skill.

Parameters
plplayer to compute for.
pricebase price.
max_variationmaximum variation, 1 means 100%.
Returns
price variation, always 0 or positive.

Definition at line 810 of file shop.c.

References find_skill_by_number(), obj::level, Settings::max_level, say::price, rndm(), settings, and SK_BARGAINING.

Referenced by sell_item(), and shop_pay_unpaid().

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◆ coords_in_shop()

static bool coords_in_shop ( mapstruct map,
int  x,
int  y 
)
static

Check if the given map coordinates are in a shop.

Definition at line 1280 of file shop.c.

References FOR_MAP_FINISH, FOR_MAP_PREPARE, disinfect::map, SHOP_FLOOR, diamondslots::x, and diamondslots::y.

Referenced by shop_contains().

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◆ cost_approx_str()

char* cost_approx_str ( const object obj,
object who 
)

Return a textual cost approximation in a newly-allocated string.

Parameters
objitem to query the price of, must not be NULL.
whoplayer asking for the price, must not be NULL.
Returns
converted value the caller is responsible to free.

Definition at line 409 of file shop.c.

References buf, archt::clone, diamondslots::cointype, cost_str(), find_next_coin(), find_skill_by_number(), get_typedata(), typedata::identifyskill, typedata::identifyskill2, LARGEST_COIN_GIVEN, MONEY, obj::name, obj::name_pl, price_approx(), real_money_value(), SK_BARGAINING, stringbuffer_append_printf(), stringbuffer_append_string(), stringbuffer_delete(), stringbuffer_finish(), stringbuffer_new(), Ice::tmp, obj::value, and autojail::who.

Referenced by examine().

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◆ cost_str()

char* cost_str ( uint64_t  cost)

Definition at line 405 of file shop.c.

References diamondslots::cost, cost_string_from_value(), and LARGEST_COIN_GIVEN.

Referenced by can_pay(), cost_approx_str(), examine(), pick_up_object(), sell_item(), shop_describe(), and shop_pay_unpaid().

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◆ cost_string_from_value()

char* cost_string_from_value ( uint64_t  cost,
int  largest_coin 
)

Converts a price to number of coins.

While cost is 64 bit, the number of any coin is still really limited to 32 bit (size of nrof field). If it turns out players have so much money that they have more than 2 billion platinum coins, there are certainly issues - the easiest fix at that time is to add a higher denomination (mithril piece with 10,000 silver or something)

Parameters
costvalue to transform to currency.
largest_coinmaximum coin to give the price into, should be between 0 and NUM_COINS - 1.
Returns
converted value the caller is responsible to free.

Definition at line 322 of file shop.c.

References buf, archt::clone, diamondslots::cointype, diamondslots::cost, done, find_next_coin(), obj::name, NUM_COINS, stringbuffer_append_printf(), stringbuffer_append_string(), stringbuffer_finish(), stringbuffer_new(), UINT32_MAX, and obj::value.

Referenced by cfapi_cost_string_from_value(), and cost_str().

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◆ count_unpaid()

static void count_unpaid ( object pl,
object item,
int *  unpaid_count,
uint64_t *  unpaid_price,
uint32_t *  coincount 
)
static

Sum the amount to pay for all unpaid items and find available money.

Parameters
plplayer we're checking for, used for buying price with bargaining.
itemitem to check for.
[out]unpaid_counthow many unpaid items are left.
[out]unpaid_pricetotal price unpaid.
coincountarray of NUM_COINS size, will contain how many coins of the type the player has.

Definition at line 780 of file shop.c.

References coins, FLAG_UNPAID, FOR_OB_AND_BELOW_FINISH, FOR_OB_AND_BELOW_PREPARE, NUM_COINS, QUERY_FLAG, and shop_price_buy().

Referenced by can_pay().

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◆ find_next_coin()

static archetype* find_next_coin ( uint64_t  c,
int *  cointype 
)
static

Find the coin type that is worth more than 'c'. Starts at the cointype placement.

Parameters
cvalue we're searching.
cointypefirst coin type to search.
Returns
coin archetype, NULL if none found.

Definition at line 290 of file shop.c.

References c, archt::clone, coins, diamondslots::cointype, find_archetype(), and obj::value.

Referenced by cost_approx_str(), and cost_string_from_value().

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◆ insert_objects()

static void insert_objects ( object pl,
object container,
object objects[],
int  objects_len 
)
static

Insert a list of objects into a player object.

Parameters
plthe player to add to
containerthe container (inside the player object) to add to
objectsthe list of objects to add; the objects will be either inserted into the player object or freed
objects_lenthe length of objects

Definition at line 647 of file shop.c.

References esrv_update_item(), object_free_drop_inventory(), object_insert_in_ob(), objects, and UPD_WEIGHT.

Referenced by pay_from_container().

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◆ pay_for_amount()

int pay_for_amount ( uint64_t  to_pay,
object pl 
)

Takes the amount of money from the the player inventory and from it's various pouches using the pay_from_container() function.

Parameters
to_payamount to pay.
plplayer paying.
Returns
0 if not enough money, in which case nothing is removed, 1 if money was removed.
Todo:
check if pl is a player, as query_money() expects that. Check if fix_object() call is required.

Definition at line 501 of file shop.c.

References CONTAINER, fix_object(), FLAG_APPLIED, FMT64U, FOR_INV_FINISH, FOR_INV_PREPARE, llevError, LOG(), pay_from_container(), QUERY_FLAG, and query_money().

Referenced by cfapi_object_pay_amount().

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◆ pay_for_item()

int pay_for_item ( object op,
object pl,
uint64_t  reduction 
)

Player attemps to buy an item, if she has enough money then remove coins as needed from active containers. Also handles bargaining experience.

Parameters
opobject to buy.
plplayer buying.
reductionpositive or null price reduction, must be below the price of the item.
Returns
1 if object was bought, 0 else.
Todo:
check if pl is a player, as query_money() expects a player.

Definition at line 541 of file shop.c.

References CONTAINER, FALSE, fix_object(), FLAG_APPLIED, FLAG_WAS_WIZ, FMT64U, FOR_INV_FINISH, FOR_INV_PREPARE, llevError, LOG(), give::op, pay_from_container(), QUERY_FLAG, query_money(), Settings::real_wiz, SET_FLAG, settings, and shop_price_buy().

Referenced by cfapi_object_pay_item(), and shop_pay_unpaid().

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◆ pay_from_container()

static uint64_t pay_from_container ( object pl,
object pouch,
uint64_t  to_pay 
)
static

This pays for the item, and takes the proper amount of money off the specified container (pouch or player), without recursing opened containers.

Parameters
plplayer paying.
pouchcontainer (pouch or player) to remove the coins from.
to_payrequired amount.
Returns
amount still not paid after using "pouch".

Definition at line 675 of file shop.c.

References add_value(), archt::clone, coins, CONTAINER, find_archetype(), FOR_INV_FINISH, FOR_INV_PREPARE, if(), insert_objects(), llevError, LOG(), MONEY, obj::name, obj::nrof, NUM_COINS, object_copy(), object_free_drop_inventory(), object_new(), object_remove(), PLAYER, remove_value(), Ice::tmp, obj::type, and obj::value.

Referenced by pay_for_amount(), and pay_for_item().

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◆ price_approx()

uint64_t price_approx ( const object obj,
object who 
)

Adjust the value of the given item based on the player's skills. This function should only be used when calculating "you reckon" prices.

Parameters
objitem in question. Must not be NULL.
whoplayer trying to judge the value of the item. Must not be NULL.
Returns
approximate value of obj.

Definition at line 133 of file shop.c.

References find_skill_by_number(), get_typedata(), typedata::identifyskill, typedata::identifyskill2, obj::level, llevError, LOG(), price_base(), Ice::tmp, and autojail::who.

Referenced by cost_approx_str().

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◆ price_base()

uint64_t price_base ( const object obj)

Price an item based on its value or archetype value, type, identification/BUC status, and other heuristics.

Shopkeepers always know the BUC status of items. Adjust the base price of items based on their BUC status. Note that later in shop_price_sell, we further decrease the sell price of cursed and damned items.

Definition at line 75 of file shop.c.

References obj::arch, archt::clone, FLAG_BLESSED, FLAG_CURSED, FLAG_DAMNED, liv::food, GEM, is_identified(), castle_read::key, obj::magic, MONEY, NROF(), object_get_value(), QUERY_FLAG, obj::stats, obj::type, obj::value, and WAND.

Referenced by alchemy_object(), attempt_do_alchemy(), check_pick(), price_approx(), shop_price_buy(), and shop_price_sell().

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◆ query_money()

uint64_t query_money ( const object op)

Determine the amount of money the given object contains, including what is inside containers.

Parameters
opPlayer or container object
Returns
Total amount of money inside

Definition at line 470 of file shop.c.

References CONTAINER, FLAG_APPLIED, FOR_INV_FINISH, FOR_INV_PREPARE, llevError, LOG(), MONEY, give::op, PLAYER, QUERY_FLAG, Ice::tmp, and mail_login::total.

Referenced by can_pay(), cfapi_object_query_money(), pay_for_amount(), pay_for_item(), and shop_pay_unpaid().

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◆ real_money_value()

static StringBuffer* real_money_value ( const object coin,
StringBuffer buf 
)
static

Returns a string representing the money's value, in plain coins.

Parameters
coincoin. Must be of type MONEY.
bufbuffer to append to. Must not be NULL.
Returns
buf with the value.

Definition at line 397 of file shop.c.

References buf, MONEY, obj::name, obj::name_pl, obj::nrof, stringbuffer_append_printf(), and obj::type.

Referenced by cost_approx_str().

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◆ remove_value()

static int64_t remove_value ( object coin_objs[],
int64_t  remain 
)
static

This function removes a given amount from a list of coins.

Parameters
coin_objsthe list coins to remove from; the list must be ordered from least to most valuable coin.
remainthe value (in silver coins) to remove
Returns
the value remaining

Definition at line 582 of file shop.c.

References disinfect::count, obj::nrof, NUM_COINS, autojail::value, and obj::value.

Referenced by pay_from_container().

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◆ sell_item()

void sell_item ( object op,
object pl 
)

Player is selling an item. Give money, print appropriate messages.

Will fill applied money containers before dumping remaining coins in character's inventory.

Parameters
opobject to sell.
plplayer. Shouldn't be NULL or non player.

Definition at line 963 of file shop.c.

References change_exp(), archt::clone, coins, compute_price_variation_with_bargaining(), CONTAINER, cost_str(), disinfect::count, draw_ext_info_format(), esrv_update_item(), EVENT_SELLING, events_execute_object_event(), find_archetype(), FLAG_APPLIED, FLAG_UNPAID, FOR_INV_FINISH, FOR_INV_PREPARE, FREE_AND_CLEAR_STR, identify(), LARGEST_COIN_GIVEN, llevDebug, llevError, LOG(), MAX_BUF, MAX_SELL_EXTRA, MSG_TYPE_SHOP, MSG_TYPE_SHOP_SELL, NDI_UNIQUE, object_copy(), object_insert_in_ob(), object_new(), give::op, PLAYER, say::price, QUERY_FLAG, query_name(), SCRIPT_FIX_ALL, SET_FLAG, shop_price_sell(), SK_EXP_NONE, Ice::tmp, UPD_WEIGHT, obj::value, and obj::weight.

Referenced by drop_object().

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◆ shop_approval()

double shop_approval ( const mapstruct map,
const object player 
)

Return the approval ratio for a shop for a given player. This is based on both the race of the shopkeeper and the player.

Parameters
mapMap with a shop
playerPlayer in question
Returns
Approval ratio between 0 and 1

Definition at line 1121 of file shop.c.

References disinfect::map, and NEUTRAL_RATIO.

Referenced by shop_describe(), shop_mat_type_move_on(), shop_price_buy(), and shop_price_sell().

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◆ shop_buy_multiplier()

static float shop_buy_multiplier ( int  charisma)
static

Calculate the buy price multiplier based on a player's charisma.

Parameters
charismaplayer's charisma.
Returns
buy multiplier between 2 and 0.5.

Definition at line 174 of file shop.c.

Referenced by shop_price_buy().

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◆ shop_contains()

bool shop_contains ( object ob)

Check if an object is in a shop.

Definition at line 1287 of file shop.c.

References coords_in_shop(), and guildjoin::ob.

Referenced by convert_item(), drop_object(), examine(), kill_player_not_permadeath(), shop_mat_type_move_on(), and transport_type_apply().

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◆ shop_describe()

int shop_describe ( const object op)

A player is examining a shop, so describe it.

Parameters
opwho is examining the shop.
Returns
0 if op is not a player, 1 else.

Definition at line 1185 of file shop.c.

References cost_str(), draw_ext_info(), draw_ext_info_format(), make_list_like(), disinfect::map, MAX_BUF, MSG_TYPE_SHOP, MSG_TYPE_SHOP_LISTING, MSG_TYPE_SHOP_MISC, NDI_UNIQUE, give::op, PLAYER, shop_approval(), Ice::tmp, and autojail::value.

Referenced by do_skill().

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◆ shop_greed()

static double shop_greed ( const mapstruct map)
static

Gets shop's greed.

Parameters
mapmap to get greed.
Returns
greed of the shop on map, or 1 if it isn't specified.

Definition at line 1113 of file shop.c.

References disinfect::map.

Referenced by shop_price_buy(), and shop_price_sell().

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◆ shop_pay_unpaid()

int shop_pay_unpaid ( object pl,
object op 
)

Pay as many unpaid items as possible, recursing on op->inv and op->below.

Parameters
plplayer who is buying items.
opfirst potentially unpaid item.
Returns
0 if some items were unpaid, 1 if all unpaid items (if any) were paid.

Definition at line 883 of file shop.c.

References change_exp(), CLEAR_FLAG, compute_price_variation_with_bargaining(), cost_str(), draw_ext_info_format(), esrv_update_item(), EVENT_BOUGHT, events_execute_object_event(), FLAG_PLAYER_SOLD, FLAG_UNPAID, MAX_BUF, MAX_BUY_REDUCTION, MSG_TYPE_SHOP, MSG_TYPE_SHOP_PAYMENT, NDI_UNIQUE, object_merge(), give::op, pay_for_item(), PLAYER, say::price, QUERY_FLAG, query_money(), query_name(), SCRIPT_FIX_ALL, SET_FLAG, shop_price_buy(), SK_EXP_NONE, Ice::tmp, UPD_FLAGS, UPD_NAME, and autojail::value.

Referenced by shop_mat_type_move_on().

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◆ shop_price_buy()

uint64_t shop_price_buy ( const object obj,
object who 
)

Adjust the value of an item to be bought based on the player's bargaining skill and charisma. This should only be used if the player is in a shop.

Parameters
objitem in question. Must not be NULL.
whoplayer trying to judge the value of the item. Must not be NULL.
Returns
value of obj.

Definition at line 186 of file shop.c.

References FLAG_CURSED, FLAG_DAMNED, FLAG_PLAYER_SOLD, GEM, castle_read::key, object_get_value(), PLAYER, price_base(), QUERY_FLAG, shop_approval(), shop_buy_multiplier(), shop_greed(), shop_specialisation_ratio(), Ice::tmp, and autojail::who.

Referenced by count_unpaid(), examine(), pay_for_item(), pick_up_object(), and shop_pay_unpaid().

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◆ shop_price_sell()

uint64_t shop_price_sell ( const object obj,
object who 
)

Adjust the value of an item to be sold based on the player's bargaining skill and charisma. This should only be used if the player is in a shop.

Parameters
objitem in question. Must not be NULL.
whoplayer trying to judge the value of the item. Must not be NULL.
Returns
value of obj.

Definition at line 238 of file shop.c.

References FLAG_BEEN_APPLIED, GEM, is_identified(), castle_read::key, NROF(), object_get_value(), PLAYER, price_base(), QUERY_FLAG, shop_approval(), shop_greed(), shop_specialisation_ratio(), Ice::tmp, value_limit(), and autojail::who.

Referenced by examine(), sell_item(), and START_TEST().

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◆ shop_specialisation_ratio()

static double shop_specialisation_ratio ( const object item,
const mapstruct map 
)
static

Returns a double that is the ratio of the price that a shop will offer for item based on the shops specialisation. Does not take account of greed, returned value is between (2*SPECIALISATION_EFFECT-1) and 1 and in any event is never less than 0.1 (calling functions divide by it).

Parameters
itemitem to get ratio of.
mapshop map.
Returns
ratio specialisation for the item.

Definition at line 1068 of file shop.c.

References shopitem::index, llevDebug, llevError, LOG(), disinfect::map, SPECIALISATION_EFFECT, shopitem::strength, and shopitem::typenum.

Referenced by shop_price_buy(), and shop_price_sell().

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◆ value_limit()

static uint64_t value_limit ( uint64_t  val,
int  quantity,
const object who,
int  isshop 
)
static

Limit the value of items based on the wealth of the shop. If the item is close to the maximum value a shop will offer, we start to reduce it, if the item is below the minimum value the shop is prepared to trade in, then we don't want it and offer nothing. If it isn't a shop, check whether we should do generic value reduction.

Parameters
valcurrent price.
quantitynumber of items.
whoplayer selling.
isshop0 if not a shop, 1 if a shop.
Returns
maximum global value.

Definition at line 1151 of file shop.c.

References isqrt(), llevError, LOG(), disinfect::map, MIN, commongive::quantity, and autojail::who.

Referenced by shop_price_sell().

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Variable Documentation

◆ coins

const char* const coins[]
static
Initial value:
= {
"ambercoin",
"jadecoin",
"platinacoin",
"goldcoin",
"silvercoin",
NULL
}

Coins to use for shopping.

Definition at line 62 of file shop.c.

Referenced by can_pay(), count_unpaid(), find_next_coin(), pay_from_container(), and sell_item().