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

#include "global.h"
#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "shop.h"
#include "sproto.h"

Include dependency graph for shop.c:

Go to the source code of this file.

Macros
#define	DISAPPROVAL_RATIO 0.2
	Price a shopkeeper will give to someone they disapprove of. More...

#define	LARGEST_COIN_GIVEN 2
	Never give amber or jade, but accept them. More...

#define	NEUTRAL_RATIO 0.8
	Price a shopkeeper will give someone they neither like nor dislike. More...

#define	NUM_COINS 5
	Number of coin types. More...

#define	SPECIALISATION_EFFECT 0.5
	This is a measure of how effective store specialisation is. More...

Functions
static void	add_value (object *coin_objs[], int64_t value)
	This function adds a given amount to a list of coins. More...

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. More...

static bool	coords_in_shop (mapstruct *map, int x, int y)
	Check if the given map coordinates are in a shop. More...

char *	cost_approx_str (const object tmp, object who)
	Return a textual cost approximation in a newly-allocated string. More...

char *	cost_str (uint64_t cost)

char *	cost_string_from_value (uint64_t cost, int largest_coin)
	Converts a price to number of coins. More...

static void	count_unpaid (object pl, object item, int unpaid_count, uint64_t unpaid_price, uint32_t *coincount)
	Helper function for can_pay(). More...

static archetype *	find_next_coin (uint64_t c, int *cointype)
	Find the coin type that is worth more than 'c'. More...

static void	insert_objects (object pl, object container, object *objects[], int objects_len)
	Insert a list of objects into a player object. More...

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. More...

int	pay_for_item (object op, object pl)
	DAMN: This is now a wrapper for pay_from_container, which is called for the player, then for each active container that can hold money until op is paid for. More...

static uint64_t	pay_from_container (object pl, object pouch, uint64_t to_pay)
	This pays for the item, and takes the proper amount of money off the player. More...

uint64_t	price_approx (const object tmp, object who)
	Adjust the value of the given item based on the player's skills. More...

uint64_t	price_base (const object *tmp)
	Determine the base (intrinsic) value of an item. More...

uint64_t	query_money (const object *op)
	Determine the amount of money the given object contains, including what is inside containers. More...

static StringBuffer *	real_money_value (const object coin, StringBuffer buf)
	Returns a string representing the money's value, in plain coins. More...

static int64_t	remove_value (object *coin_objs[], int64_t remain)
	This function removes a given amount from a list of coins. More...

void	sell_item (object op, object pl)
	Player is selling an item. More...

double	shop_approval (const mapstruct map, const object player)
	Return the approval ratio for a shop for a given player. More...

static float	shop_bargain_multiplier (int lev_bargain)
	Calculate the buy price multiplier based on a player's bargaining skill. More...

static float	shop_buy_multiplier (int charisma)
	Calculate the buy price multiplier based on a player's charisma. More...

bool	shop_contains (object *ob)
	Check if an object is in a shop. More...

int	shop_describe (const object *op)
	Give the player a description of the shop on their current map. More...

static double	shop_greed (const mapstruct *map)
	Gets shop's greed. More...

int	shop_pay_unpaid (object pl, object op)
	Pay for each unpaid item carried by a player, including those inside containers. More...

uint64_t	shop_price_buy (const object tmp, object who)
	Adjust the value of an item to be bought based on the player's bargaining skill and charisma. More...

uint64_t	shop_price_sell (const object tmp, object who)
	Adjust the value of an item to be sold based on the player's bargaining skill and charisma. More...

static double	shop_specialisation_ratio (const object item, const mapstruct map)
	returns a double that is the ratio of the price that a shop will offer for item based on the shops specialisation. More...

static uint64_t	value_limit (uint64_t val, int quantity, const object *who, int isshop)
	Limit the value of items based on the wealth of the shop. More...

Variables
static const char *const	coins []
	Coins to use for shopping. More...

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

#define DISAPPROVAL_RATIO 0.2

Price a shopkeeper will give to someone they disapprove of.

Definition at line 42 of file shop.c.

#define LARGEST_COIN_GIVEN 2

Never give amber or jade, but accept them.

Definition at line 54 of file shop.c.

Referenced by add_value(), cost_approx_str(), cost_str(), and sell_item().

#define NEUTRAL_RATIO 0.8

Price a shopkeeper will give someone they neither like nor dislike.

Definition at line 45 of file shop.c.

Referenced by shop_approval().

#define NUM_COINS 5

Number of coin types.

Definition at line 52 of file shop.c.

Referenced by add_value(), can_pay(), cost_string_from_value(), count_unpaid(), pay_from_container(), and remove_value().

#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.

Referenced by shop_specialisation_ratio().

Function Documentation

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

static

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

Parameters

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

Definition at line 636 of file shop.c.

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

Referenced by pay_from_container().

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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

pl	player trying to bug.

Return values

1	player could buy the items.
0	some items can't be bought.

Definition at line 831 of file shop.c.

References coins, cost_str(), count_unpaid(), draw_ext_info(), find_archetype(), obj::inv, llevError, LOG(), make_list_like(), MAX_BUF, MSG_TYPE_SHOP, MSG_TYPE_SHOP_PAYMENT, NDI_UNIQUE, NUM_COINS, PLAYER, query_money(), snprintf, and obj::type.

Referenced by cfapi_player_can_pay(), and shop_mat_type_move_on().

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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 1251 of file shop.c.

References FOR_MAP_FINISH, FOR_MAP_PREPARE, and SHOP_FLOOR.

Referenced by shop_contains().

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char* cost_approx_str	(	const object *	obj,
		object *	who
	)

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

Parameters

obj	item to query the price of, must not be NULL.
who	player asking for the price, must not be NULL.

Returns: converted value the caller is responsible to free.

Definition at line 417 of file shop.c.

References archt::clone, 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(), obj::type, and obj::value.

Referenced by examine().

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char* cost_str ( uint64_t cost )

Definition at line 413 of file shop.c.

References 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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char* cost_string_from_value	(	uint64_t	cost,
		int	largest_coin
	)

Converts a price to number of coins.

Return the textual representation of a cost in a newly-allocated string.

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

cost	value to transform to currency.
largest_coin	maximum coin to give the price into, should be between 0 and NUM_COINS - 1.
buf	buffer to append to, if NULL a new one is returned.

Returns: buffer containing the price, either buf or if NULL a new StringBuffer.

Definition at line 330 of file shop.c.

References archt::clone, find_next_coin(), obj::name, NUM_COINS, stringbuffer_append_printf(), stringbuffer_append_string(), stringbuffer_finish(), stringbuffer_new(), and obj::value.

Referenced by cfapi_cost_string_from_value(), and cost_str().

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

static

Helper function for can_pay().

Checks all items from item and item->below, and recurse if inventory found. coincount is supposed to be of size NUM_COINS. Parameters can't be NULL.

Parameters

	pl	player.
	item	item to check for.
[out]	unpaid_count	how many unpaid items are left.
[out]	unpaid_price	total price unpaid.
	coincount	array of NUM_COINS size, will contain how many coins of the type the player has.

Definition at line 797 of file shop.c.

References obj::arch, coins, FLAG_UNPAID, FOR_OB_AND_BELOW_FINISH, FOR_OB_AND_BELOW_PREPARE, obj::inv, archt::name, obj::nrof, NUM_COINS, QUERY_FLAG, and shop_price_buy().

Referenced by can_pay().

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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

c	value we're searching.
cointype	first coin type to search.

Returns: coin archetype, NULL if none found.

Definition at line 296 of file shop.c.

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

Referenced by cost_approx_str(), and cost_string_from_value().

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

static

Insert a list of objects into a player object.

Parameters

pl	the player to add to
container	the container (inside the player object) to add to
objects	the list of objects to add; the objects will be either inserted into the player object or freed
objects_len	the length of objects

Definition at line 660 of file shop.c.

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

Referenced by pay_from_container().

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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_pay	amount to pay.
pl	player 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 509 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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int pay_for_item	(	object *	op,
		object *	pl
	)

DAMN: This is now a wrapper for pay_from_container, which is called for the player, then for each active container that can hold money until op is paid for.

Change will be left wherever the last of the price was paid from.

Parameters

op	object to buy.
pl	player buying.

Returns: 1 if object was bought, 0 else.

Todo:: check if pl is a player, as query_money() expects a player.

Definition at line 548 of file shop.c.

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

Referenced by cfapi_object_pay_item(), and shop_pay_unpaid().

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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 player.

DAMN: This function is used for the player, then for any active containers that can hold money.

Parameters

pl	player paying.
pouch	container (pouch or player) to remove the coins from.
to_pay	required amount.

Returns: amount still not paid after using "pouch".

Definition at line 691 of file shop.c.

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

Referenced by pay_for_amount(), and pay_for_item().

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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

obj	item in question. Must not be NULL.
who	player trying to judge the value of the item. Must not be NULL.

Returns: approximate value of tmp.

Definition at line 126 of file shop.c.

References obj::count, find_skill_by_number(), get_typedata(), typedata::identifyskill, typedata::identifyskill2, obj::level, llevError, LOG(), obj::name, price_base(), and obj::type.

Referenced by cost_approx_str().

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uint64_t price_base ( const object * obj )

Determine the base (intrinsic) value of an item.

This should not include adjustments such as bargaining, charisma, or shop specialization.

Parameters

obj	item in question.

Returns: base price.

If you don't know the item is cursed, would the shopkeeper know? Only penalize for cursed if it is known cursed.

Also, known blessed items should sell for a little more.

Definition at line 66 of file shop.c.

References obj::arch, archt::clone, FLAG_BLESSED, FLAG_CURSED, FLAG_DAMNED, FLAG_IDENTIFIED, FLAG_KNOWN_BLESSED, FLAG_KNOWN_CURSED, liv::food, GEM, obj::magic, MONEY, need_identify(), obj::nrof, object_get_value(), QUERY_FLAG, obj::stats, obj::type, obj::value, and WAND.

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

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uint64_t query_money ( const object * op )

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

Parameters

op	Player or container object

Returns: Total amount of money inside

Definition at line 478 of file shop.c.

References CONTAINER, FLAG_APPLIED, FOR_INV_FINISH, FOR_INV_PREPARE, llevError, LOG(), MONEY, PLAYER, QUERY_FLAG, and obj::type.

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

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

static

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

Parameters

coin	coin. Must be of type MONEY.
buf	buffer to append to. Must not be NULL.

Returns: buf with the value.

Definition at line 405 of file shop.c.

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

Referenced by cost_approx_str().

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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_objs	the list coins to remove from; the list must be ordered from least to most valuable coin.
remain	the value (in silver coins) to remove

Returns: the value remaining

Definition at line 595 of file shop.c.

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

Referenced by pay_from_container().

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void sell_item	(	object *	op,
		object *	pl
	)

Player is selling an item.

Give money, print appropriate messages.

This function uses the coins[] array to know what coins are available.

Modified to fill available race: gold containers before dumping remaining coins in character's inventory.

Parameters

op	object to sell.
pl	player. Shouldn't be NULL or non player.

Definition at line 940 of file shop.c.

References change_exp(), archt::clone, coins, CONTAINER, cost_str(), obj::custom_name, draw_ext_info_format(), esrv_update_item(), EVENT_SELLING, execute_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, MSG_TYPE_SHOP, MSG_TYPE_SHOP_SELL, NDI_UNIQUE, obj::nrof, object_copy(), object_insert_in_ob(), object_new(), PLAYER, price_base(), QUERY_FLAG, query_name(), SCRIPT_FIX_ALL, SET_FLAG, shop_price_sell(), SK_EXP_NONE, obj::type, UPD_WEIGHT, obj::value, and obj::weight.

Referenced by drop_object().

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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

map	Map with a shop
player	Player in question

Returns: Approval ratio between 0 and 1

Definition at line 1097 of file shop.c.

References NEUTRAL_RATIO, obj::race, and mapdef::shoprace.

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

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static float shop_bargain_multiplier ( int lev_bargain )

static

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

The reciprocal of this result can be used as a sell multiplier.

Parameters

lev_bargain player's bargaining level.

Returns: buy multiplier between 1 and 0.5.

Definition at line 186 of file shop.c.

References Settings::max_level, and settings.

Referenced by shop_price_buy().

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static float shop_buy_multiplier ( int charisma )

static

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

Parameters

charisma player's charisma.

Returns: buy multiplier between 2 and 0.5.

Definition at line 167 of file shop.c.

Referenced by shop_price_buy().

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bool shop_contains ( object * ob )

Check if an object is in a shop.

Definition at line 1258 of file shop.c.

References coords_in_shop(), obj::map, obj::x, and obj::y.

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

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int shop_describe ( const object * op )

Give the player a description of the shop on their current map.

This is used for the bargaining skill.

Parameters

op	Non-null player to describe the shop to

Returns: Zero if the object is not a player, 1 otherwise

Definition at line 1156 of file shop.c.

References cost_str(), draw_ext_info(), draw_ext_info_format(), shopitem::index, make_list_like(), obj::map, MAX_BUF, MSG_TYPE_SHOP, MSG_TYPE_SHOP_LISTING, MSG_TYPE_SHOP_MISC, shopitem::name, shopitem::name_pl, NDI_UNIQUE, PLAYER, shop_approval(), mapdef::shopgreed, mapdef::shopitems, mapdef::shopmax, mapdef::shopmin, mapdef::shoprace, snprintf, shopitem::strength, and obj::type.

Referenced by do_skill().

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static double shop_greed ( const mapstruct * map )

static

Gets shop's greed.

Parameters

map	map to get greed.

Returns: greed of the shop on map, or 1 if it isn't specified.

Definition at line 1089 of file shop.c.

References mapdef::shopgreed.

Referenced by shop_price_buy(), and shop_price_sell().

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int shop_pay_unpaid	(	object *	pl,
		object *	op
	)

Pay for each unpaid item carried by a player, including those inside containers.

It is a good idea to call can_pay() before using this function, because items are paid for here in no particular order.

Parameters

pl	Player making purchase
op	Container to examine, usually the same player object

Return values

0	Player still has unpaid items
1	Player paid for all unpaid items

Definition at line 874 of file shop.c.

References obj::below, CLEAR_FLAG, cost_str(), draw_ext_info_format(), esrv_update_item(), FLAG_PLAYER_SOLD, FLAG_UNPAID, obj::inv, MAX_BUF, MSG_TYPE_SHOP, MSG_TYPE_SHOP_PAYMENT, NDI_UNIQUE, object_merge(), pay_for_item(), PLAYER, QUERY_FLAG, query_money(), query_name(), SET_FLAG, shop_price_buy(), obj::type, UPD_FLAGS, and UPD_NAME.

Referenced by shop_mat_type_move_on().

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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

obj	item in question. Must not be NULL.
who	player trying to judge the value of the item. Must not be NULL.

Returns: value of tmp.

Definition at line 190 of file shop.c.

References liv::Cha, find_skill_by_number(), FLAG_PLAYER_SOLD, GEM, obj::level, obj::map, object_get_value(), PLAYER, price_base(), QUERY_FLAG, shop_approval(), shop_bargain_multiplier(), shop_buy_multiplier(), shop_greed(), shop_specialisation_ratio(), SK_BARGAINING, obj::stats, and obj::type.

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

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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

obj	item in question. Must not be NULL.
who	player trying to judge the value of the item. Must not be NULL.

Returns: value of tmp.

Definition at line 243 of file shop.c.

References obj::arch, FLAG_BEEN_APPLIED, FLAG_IDENTIFIED, GEM, obj::map, need_identify(), obj::nrof, object_get_value(), PLAYER, price_base(), QUERY_FLAG, shop_approval(), shop_greed(), shop_specialisation_ratio(), obj::type, and value_limit().

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

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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

item	item to get ratio of.
map	shop map.

Returns: ratio specialisation for the item.

Definition at line 1044 of file shop.c.

References shopitem::index, llevDebug, llevError, LOG(), mapdef::path, mapdef::shopitems, SPECIALISATION_EFFECT, shopitem::strength, obj::type, and shopitem::typenum.

Referenced by shop_price_buy(), and shop_price_sell().

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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

val	current price.
quantity	number of items.
who	player selling.
isshop	0 if not a shop, 1 if a shop.

Returns: maximum global value.

Definition at line 1127 of file shop.c.

References isqrt(), llevError, LOG(), obj::map, MIN, obj::name, mapdef::shopmax, and mapdef::shopmin.

Referenced by shop_price_sell().

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Variable Documentation

const char* const coins[]

static

Initial value:

= {
    "ambercoin",
    "jadecoin",
    "platinacoin",
    "goldcoin",
    "silvercoin",
    NULL
}

Coins to use for shopping.

Definition at line 57 of file shop.c.

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

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