#include <global.h>
#include <loader.h>
#include <skills.h>
#include <sproto.h>
#include <living.h>
#include <math.h>

Include dependency graph for c_object.c:

Macros
#define	OBLINKMALLOC(p)

Functions
int	command_apply (object op, char params)

int	command_disarm (object op, char params)

int	command_drop (object op, char params)

int	command_dropall (object op, char params)

int	command_empty (object op, char params)

int	command_examine (object op, char params)

int	command_lock_item (object op, char params)

int	command_mark (object op, char params)

int	command_pickup (object op, char params)

int	command_rename_item (object op, char params)

int	command_rskill (object pl, char params)

int	command_search (object op, char params)

int	command_search_items (object op, char params)

int	command_take (object op, char params)

int	command_throw (object op, char params)

int	command_use (object op, char params)

int	command_uskill (object pl, char params)

static void	display_new_pickup (const object *op)

void	drop (object op, object tmp)

object *	drop_object (object op, object tmp, uint32 nrof)

static void	empty_container (object container, object pl)

void	examine (object op, object tmp)

void	examine_monster (object op, object tmp)

static object *	find_best_apply_object_match (object start, object pl, const char *params, int aflag)

static object *	find_best_object_match (object pl, const char params)

object *	find_marked_object (object *op)

void	inventory (object op, object inv)

void	pick_up (object op, object alt)

static void	pick_up_object (object pl, object op, object *tmp, int nrof)

void	put_object_in_sack (object op, object sack, object *tmp, uint32 nrof)

int	sack_can_hold (const object pl, const object sack, const object *op, uint32 nrof)

static void	set_pickup_mode (const object *op, int i)

Detailed Description

Object commands, including picking/dropping, locking, etc.

Todo:: clean multiple variations of same stuff (pickup and such), or rename for less confusion.

Definition in file c_object.c.

Macro Definition Documentation

#define OBLINKMALLOC ( p )

Value:

if (!((p) = (objectlink *)malloc(sizeof(objectlink)))) \

fatal(OUT_OF_MEMORY);

OUT_OF_MEMORY

#define OUT_OF_MEMORY

Definition: define.h:94

oblnk

Definition: object.h:298

fatal

void fatal(int err)

Definition: glue.c:60

Simple objectlink allocation, fail-safe.

Definition at line 50 of file c_object.c.

Function Documentation

int command_apply	(	object *	op,
		char *	params
	)

'apply' command.

Parameters

op	player.
params	what to apply.

Returns: whether skill was used or not.

Definition at line 221 of file c_object.c.

References obj::above, AP_APPLY, AP_UNAPPLY, obj::container, draw_ext_info_format(), find_best_apply_object_match(), obj::inv, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, NDI_UNIQUE, player_apply(), and player_apply_below().

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int command_disarm	(	object *	op,
		char *	params
	)

'disarm' command.

Parameters

op	player.
params	unused.

Returns: whether skill was used or not.

Definition at line 181 of file c_object.c.

References SK_DISARM_TRAPS, skill_names, and use_skill().

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int command_drop	(	object *	op,
		char *	params
	)

'drop' command.

Parameters

op	player.
params	what to drop.

Returns: 0.

Definition at line 1173 of file c_object.c.

References obj::below, obj::contr, pl::count, draw_ext_info(), draw_ext_info_format(), drop(), FLAG_INV_LOCKED, FLAG_NO_DROP, obj::inv, obj::invisible, item_matched_string(), MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, NDI_UNIQUE, PLAYER, QUERY_FLAG, pl::socket, obj::type, and socket_struct::update_look.

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int command_dropall	(	object *	op,
		char *	params
	)

Command to drop all items that have not been locked.

Parameters

op	player.
params	optional specifier, like 'armour', 'weapon' and such.

Returns: 0.

Definition at line 1021 of file c_object.c.

References AMULET, ARMOUR, ARMOUR_IMPROVER, ARROW, obj::below, BOOK, BOOTS, BOW, BRACERS, CLEAR_FLAG, CLOAK, obj::container, CONTAINER, obj::contr, pl::count, draw_ext_info(), DRINK, drop(), esrv_update_item(), fix_object(), FLAG_APPLIED, FLAG_INV_LOCKED, FLAG_NO_FIX_PLAYER, FLESH, FOOD, GEM, GIRDLE, GLOVES, HELMET, HORN, obj::inv, obj::invisible, KEY, MONEY, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, NDI_UNIQUE, PLAYER, POTION, QUERY_FLAG, RING, ROD, SCROLL, SET_FLAG, SHIELD, pl::socket, SPECIAL_KEY, SPELLBOOK, obj::type, UPD_WEIGHT, socket_struct::update_look, WAND, WEAPON, and WEAPON_IMPROVER.

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int command_empty	(	object *	op,
		char *	params
	)

'empty' command.

Parameters

op	player.
params	item specifier.

Returns: 0.

Definition at line 1263 of file c_object.c.

References obj::below, CONTAINER, draw_ext_info(), empty_container(), find_best_object_match(), obj::inv, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, NDI_UNIQUE, and obj::type.

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int command_examine	(	object *	op,
		char *	params
	)

'examine' command.

Parameters

op	player.
params	optional item specifier.

Returns: 0.

Definition at line 1306 of file c_object.c.

References obj::below, draw_ext_info_format(), examine(), find_best_object_match(), LOOK_OBJ, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, and NDI_UNIQUE.

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int command_lock_item	(	object *	op,
		char *	params
	)

Alternate way to lock/unlock items (command line).

Parameters

op	player
params	sent command line.

Definition at line 2234 of file c_object.c.

References CLEAR_FLAG, obj::count, draw_ext_info(), draw_ext_info_format(), esrv_update_item(), find_best_object_match(), FLAG_INV_LOCKED, HUGE_BUF, merge_ob(), MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_FAILURE, NDI_UNIQUE, QUERY_FLAG, query_short_name(), SET_FLAG, and UPD_FLAGS.

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int command_mark	(	object *	op,
		char *	params
	)

'mark' command, to mark an item for some effects (enchant armor, ...).

Parameters

op	player.
params	If empty, we print out the currently marked object. Otherwise, try to find a matching object - try best match first.

Returns: 1 or 0.

Definition at line 1376 of file c_object.c.

References obj::contr, obj::count, draw_ext_info(), draw_ext_info_format(), find_best_object_match(), find_marked_object(), pl::mark, pl::mark_count, MAX_BUF, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_COMMAND_SUCCESS, NDI_UNIQUE, and query_name().

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int command_pickup	(	object *	op,
		char *	params
	)

'pickup' command.

Parameters

op	player.
params	pickup mode. Can be empty to display the current mode.

Returns: 1 if success, 0 else.

Todo:: trash old pickup mode, merge with new pickup.

Definition at line 1867 of file c_object.c.

References obj::contr, display_new_pickup(), draw_ext_info(), draw_ext_info_format(), llevDebug, LOG(), pl::mode, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, NDI_UNIQUE, PU_ALLWEAPON, PU_ARMOUR, PU_ARROW, PU_BOOTS, PU_BOW, PU_CLOAK, PU_DEBUG, PU_DRINK, PU_FLESH, PU_FOOD, PU_GLOVES, PU_HELMET, PU_INHIBIT, PU_JEWELS, PU_KEY, PU_MAGIC_DEVICE, PU_MAGICAL, PU_MISSILEWEAPON, PU_NEWMODE, PU_NOT_CURSED, PU_POTION, PU_READABLES, PU_SHIELD, PU_SKILLSCROLL, PU_SPELLBOOK, PU_STOP, PU_VALUABLES, and set_pickup_mode().

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int command_rename_item	(	object *	op,
		char *	params
	)

Changing the custom name of an item

Syntax is: rename <what object> to <new name>

if 'what object' is omitted, marked object is used
if 'to new name' is omitted, custom name is cleared

Names are considered for all purpose having a length <=127 (max length sent to client by server).

Parameters

op	player.
params	how to rename.

Returns: 1

Definition at line 2047 of file c_object.c.

References obj::below, obj::count, obj::custom_name, draw_ext_info(), draw_ext_info_format(), esrv_update_item(), find_best_object_match(), find_marked_object(), FREE_AND_CLEAR_STR, FREE_AND_COPY, obj::inv, obj::invisible, MAX_BUF, merge_ob(), MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_COMMAND_SUCCESS, NDI_UNIQUE, obj::nrof, query_base_name(), snprintf(), UPD_NAME, and VERY_BIG_BUF.

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int command_rskill	(	object *	pl,
		char *	params
	)

'ready_skill' command.

Parameters

pl	player.
params	skill name.

Returns: whether skill was readied or not.

Definition at line 132 of file c_object.c.

References change_skill(), draw_ext_info(), draw_ext_info_format(), find_skill_by_name(), MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_SKILL, MSG_TYPE_SKILL_MISSING, and NDI_UNIQUE.

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int command_search	(	object *	op,
		char *	params
	)

'search' command.

Parameters

op	player.
params	unused.

Returns: whether skill was used or not.

Definition at line 167 of file c_object.c.

References SK_FIND_TRAPS, skill_names, and use_skill().

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int command_search_items	(	object *	op,
		char *	params
	)

'search-items' command.

Parameters

op	player.
params	options.

Returns: 1.

Definition at line 1998 of file c_object.c.

References obj::contr, draw_ext_info(), draw_ext_info_format(), FALSE, fix_object(), MAX_BUF, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_COMMAND_SUCCESS, NDI_UNIQUE, Settings::search_items, pl::search_str, and settings.

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int command_take	(	object *	op,
		char *	params
	)

This takes (picks up) and item.

Parameters

op	player who issued the command.
params	string to match against the item name.

Returns: 0.

Definition at line 602 of file c_object.c.

References obj::above, obj::below, can_pick(), obj::container, draw_ext_info(), draw_ext_info_format(), FLAG_IS_FLOOR, obj::inv, obj::invisible, item_matched_string(), MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_COMMAND_FAILURE, obj::name, NDI_UNIQUE, obj::next, pick_up(), and QUERY_FLAG.

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int command_throw	(	object *	op,
		char *	params
	)

'throw' command.

A little special because we do want to pass the full params along as it includes the object to throw.

Parameters

op	player.
params	what to throw.

Returns: whether skill was used or not.

Definition at line 198 of file c_object.c.

References do_skill(), draw_ext_info(), obj::facing, find_skill_by_name(), MSG_TYPE_SKILL, MSG_TYPE_SKILL_MISSING, NDI_UNIQUE, SK_THROWING, and skill_names.

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int command_use	(	object *	op,
		char *	params
	)

Try to use an item on another. Items are checked for key/values matching.

Parameters

op	player.
params	sent string, with all parameters.

Returns: 1.

Definition at line 2282 of file c_object.c.

References obj::arch, decrease_ob, draw_ext_info(), draw_ext_info_format(), find_archetype(), find_best_object_match(), get_ob_key_value(), insert_ob_in_ob(), llevError, LOG(), MAX_BUF, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_FAILURE, obj::name, archt::name, NDI_UNIQUE, obj::nrof, object_create_arch(), PLAYER, snprintf(), obj::subtype, and obj::type.

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int command_uskill	(	object *	pl,
		char *	params
	)

'use_skill' command.

Parameters

pl	player.
params	skill to use, and optional parameters.

Returns: whether skill was used or not.

Definition at line 113 of file c_object.c.

References draw_ext_info(), MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, NDI_UNIQUE, and use_skill().

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static void display_new_pickup ( const object * op )

static

Utility function to display the pickup mode for a player.

Parameters

op	must be a player.

Definition at line 1723 of file c_object.c.

References obj::contr, draw_ext_info(), draw_ext_info_format(), pl::mode, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_INFO, NDI_UNIQUE, PU_ALLWEAPON, PU_ARMOUR, PU_ARROW, PU_BOOTS, PU_BOW, PU_CLOAK, PU_DEBUG, PU_DRINK, PU_FLESH, PU_FOOD, PU_GLOVES, PU_HELMET, PU_INHIBIT, PU_JEWELS, PU_KEY, PU_MAGIC_DEVICE, PU_MAGICAL, PU_MISSILEWEAPON, PU_NEWMODE, PU_NOT_CURSED, PU_POTION, PU_RATIO, PU_READABLES, PU_SHIELD, PU_SKILLSCROLL, PU_SPELLBOOK, PU_STOP, and PU_VALUABLES.

Referenced by command_pickup().

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void drop	(	object *	op,
		object *	tmp
	)

Drop an item, either on the floor or in a container.

Parameters

op	who is dropping an item.
tmp	what object to drop.

Definition at line 943 of file c_object.c.

References obj::above, obj::below, obj::container, obj::contr, obj::count, pl::count, draw_ext_info(), drop_object(), obj::env, FLAG_INV_LOCKED, FLAG_NO_DROP, free_object(), obj::invisible, pl::last_used, pl::last_used_id, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, NDI_UNIQUE, PLAYER, put_object_in_sack(), QUERY_FLAG, remove_ob(), and obj::type.

Referenced by cfapi_object_drop(), command_drop(), command_dropall(), empty_container(), and handle_apply_yield().

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object* drop_object	(	object *	op,
		object *	tmp,
		uint32	nrof
	)

Try to drop an object on the floor.

This function was part of drop, now is own function.

Parameters

op	who is dropping the item.
tmp	item to drop.
nrof	if is non zero, then nrof objects is tried to be dropped.

Returns: object dropped, NULL if it was destroyed.

Todo:: shouldn't tmp be NULL if was_destroyed returns true?

Definition at line 847 of file c_object.c.

References AP_NO_MERGE, AP_UNAPPLY, apply_special(), obj::contr, obj::count, draw_ext_info(), draw_ext_info_format(), esrv_update_item(), EVENT_DROP, execute_event(), fix_object(), FLAG_APPLIED, FLAG_NO_DROP, FLAG_NO_FIX_PLAYER, FLAG_STARTEQUIP, FLAG_UNPAID, free_object(), get_split_ob(), insert_ob_in_map(), is_in_shop(), obj::map, MAX_BUF, MONEY, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_COMMAND_SUCCESS, NDI_UNIQUE, obj::nrof, PLAYER, QUERY_FLAG, query_name(), remove_ob(), save_player(), SCRIPT_FIX_ALL, sell_item(), obj::type, UPD_WEIGHT, obj::value, was_destroyed, obj::x, and obj::y.

Referenced by drop(), esrv_move_object(), and transport_type_apply().

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static void empty_container	(	object *	container,
		object *	pl
	)

static

Put all contents of the container on the ground below the player or in opened container, except locked items.

Parameters

container	what to empty.
pl	player to drop for.

Definition at line 1223 of file c_object.c.

References obj::below, draw_ext_info_format(), drop(), esrv_update_item(), FLAG_INV_LOCKED, obj::inv, MAX_BUF, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_SUCCESS, NDI_UNIQUE, QUERY_FLAG, query_name(), and UPD_WEIGHT.

Referenced by command_empty().

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void examine	(	object *	op,
		object *	tmp
	)

Player examines some object.

Parameters

op	player.
tmp	object to examine.

Definition at line 1481 of file c_object.c.

References obj::body_info, body_locations, BOOK, CLOSE_CON, CONTAINER, CORPSE, obj::custom_name, draw_ext_info(), draw_ext_info_format(), examine_monster(), EXIT, F_APPROX, F_BUY, F_SELL, F_SHOP, FLAG_IDENTIFIED, FLAG_IS_BUILDABLE, FLAG_MONSTER, FLAG_NO_PICK, FLAG_STARTEQUIP, FLAG_UNPAID, liv::food, get_levelnumber(), obj::inv, is_in_shop(), obj::level, obj::materialname, obj::move_on, obj::msg, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_EXAMINE, obj::name, NDI_UNIQUE, need_identify(), obj::nrof, NUM_BODY_LOCATIONS, ob_describe(), query_cost_string(), QUERY_FLAG, obj::race, obj::skill, snprintf(), SPELLBOOK, obj::stats, liv::Str, stringbuffer_finish(), strncasecmp(), obj::type, obj::value, VERY_BIG_BUF, WAND, obj::weight, and obj::weight_limit.

Referenced by command_examine(), and examine_cmd().

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void examine_monster	(	object *	op,
		object *	tmp
	)

Player examine a monster.

Parameters

op	player.
tmp	monster being examined.

Definition at line 1424 of file c_object.c.

References AT_ACID, obj::attacktype, draw_ext_info(), FLAG_UNDEAD, obj::head, liv::hp, obj::level, liv::maxhp, mon, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_EXAMINE, NDI_UNIQUE, POISONING, present_in_ob(), QUERY_FLAG, and obj::stats.

Referenced by examine(), and probe().

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static object* find_best_apply_object_match	(	object *	start,
		object *	pl,
		const char *	params,
		int	aflag
	)

static

Search from start and through below for what matches best with params. we use item_matched_string above - this gives us consistent behaviour between many commands. Return the best match, or NULL if no match.

Parameters

start	first object to start searching at.
pl	what object we're searching for.
params	what to search for.
aflag	Either 0 or AP_APPLY or AP_UNAPPLY. Used with apply -u, and apply -a to only unapply applied, or apply unapplied objects.

Returns: matching object, or NULL if no suitable.

Definition at line 70 of file c_object.c.

References AP_APPLY, AP_UNAPPLY, obj::below, FLAG_APPLIED, obj::invisible, item_matched_string(), and QUERY_FLAG.

Referenced by command_apply(), and find_best_object_match().

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static object* find_best_object_match	(	object *	pl,
		const char *	params
	)

static

Shortcut to find_best_apply_object_match(pl->inv, pl, params, AF_NULL);

Parameters

pl	who to search an item for.
params	what to search for.

Returns: matching object, or NULL if no suitable.

Definition at line 99 of file c_object.c.

References AP_NULL, find_best_apply_object_match(), and obj::inv.

Referenced by command_empty(), command_examine(), command_lock_item(), command_mark(), command_rename_item(), and command_use().

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object* find_marked_object ( object * op )

Return the object the player has marked with the 'mark' command below. If no match is found (or object has changed), we return NULL. We leave it up to the calling function to print messages if nothing is found.

Parameters

op	object. Should be a player.

Returns: marked object if still valid, NULL else.

Definition at line 1339 of file c_object.c.

References obj::below, obj::contr, obj::count, obj::inv, obj::invisible, pl::mark, and pl::mark_count.

Referenced by animate_weapon(), apply_map_builder(), armour_improver_type_apply(), cast_item_curse_or_curse(), cfapi_object_get_property(), command_mark(), command_rename_item(), find_throw_ob(), identify_altar_type_move_on(), lighter_type_apply(), recharge(), weapon_improver_type_apply(), and write_on_item().

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void inventory	(	object *	op,
		object *	inv
	)

Prints object's inventory.

Parameters

op	who to print for.
inv	if NULL then print op's inventory, else print the inventory of inv.

Definition at line 1653 of file c_object.c.

References obj::below, CONTAINER, obj::count, draw_ext_info(), draw_ext_info_format(), FLAG_APPLIED, FLAG_WIZ, obj::inv, obj::invisible, MAX_BUF, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_COMMAND_INVENTORY, NDI_UNIQUE, QUERY_FLAG, query_name(), query_weight(), and obj::type.

Referenced by command_inventory(), and look_at().

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void pick_up	(	object *	op,
		object *	alt
	)

Try to pick up an item.

Parameters

op	object trying to pick up.
alt	optional object op is trying to pick. If NULL, try to pick first item under op.

Definition at line 462 of file c_object.c.

References obj::below, can_pick(), obj::container, CONTAINER, obj::contr, obj::count, pl::count, draw_ext_info(), draw_ext_info_format(), obj::env, FLAG_APPLIED, FLAG_STARTEQUIP, INS_NO_MERGE, insert_ob_in_map(), obj::inv, llevDebug, LOG(), obj::map, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, obj::name, NDI_UNIQUE, obj::nrof, pick_up_object(), PLAYER, QUERY_FLAG, obj::race, sack_can_hold(), stop_item(), and obj::type.

Referenced by attempt_steal(), cast_create_missile(), cfapi_object_pickup(), check_pick(), command_take(), and esrv_move_object().

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static void pick_up_object	(	object *	pl,
		object *	op,
		object *	tmp,
		int	nrof
	)

static

Try to pick up some item.

Parameters

pl	object (player or monster) picking up.
op	object to put tmp into.
tmp	object to pick up.
nrof	number of tmp to pick up (0 means all of them).

Definition at line 340 of file c_object.c.

References obj::carrying, draw_ext_info(), obj::env, esrv_update_item(), EVENT_PICKUP, execute_event(), F_BUY, F_SHOP, FALSE, fix_object(), FLAG_NO_DROP, FLAG_REMOVED, FLAG_UNPAID, FLAG_WAS_WIZ, FLAG_WIZ, free_object(), get_player_container(), get_split_ob(), HUGE_BUF, insert_ob_in_ob(), obj::inv, MAX_BUF, MAX_STAT, MOVE_FLYING, obj::move_type, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_COMMAND_FAILURE, MSG_TYPE_COMMAND_SUCCESS, NDI_UNIQUE, obj::nrof, PLAYER, query_cost_string(), QUERY_FLAG, query_name(), Settings::real_wiz, remove_ob(), SCRIPT_FIX_ALL, SET_FLAG, settings, snprintf(), obj::stats, liv::Str, stringbuffer_finish(), obj::type, UPD_WEIGHT, obj::weight, and weight_limit.

Referenced by pick_up().

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void put_object_in_sack	(	object *	op,
		object *	sack,
		object *	tmp,
		uint32	nrof
	)

Something tries to put an object into another.

This function was part of drop(), now is own function.

Note: the 'sack' in question can now be a transport, so this function isn't named very good anymore.

Parameters

op	who is moving the item.
sack	where to put the object.
tmp	what to put into sack.
nrof	if non zero, then nrof objects is tried to put into sack, else everything is put.

Definition at line 700 of file c_object.c.

References AP_NO_MERGE, AP_UNAPPLY, apply_special(), obj::below, CLEAR_FLAG, obj::container, CONTAINER, obj::contr, obj::count, draw_ext_info(), draw_ext_info_format(), obj::env, esrv_update_item(), fix_object(), FLAG_APPLIED, FLAG_NO_FIX_PLAYER, FLAG_STARTEQUIP, get_split_ob(), insert_ob_in_map_at(), insert_ob_in_ob(), obj::inv, obj::map, MAX_BUF, obj::move_off, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR, MSG_TYPE_COMMAND_FAILURE, MSG_TYPE_COMMAND_SUCCESS, NDI_UNIQUE, obj::nrof, PLAYER, QUERY_FLAG, query_name(), remove_ob(), sack_can_hold(), set_object_face_main(), obj::slaying, pl::socket, TRANSPORT, transport_can_hold(), obj::type, UPD_WEIGHT, socket_struct::update_look, obj::x, and obj::y.

Referenced by drop(), esrv_move_object(), and START_TEST().

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int sack_can_hold	(	const object *	pl,
		const object *	sack,
		const object *	op,
		uint32	nrof
	)

Check if an item op can be put into a sack. If pl exists then tell a player the reason of failure.

Parameters

pl	player.
sack	container to try to put into.
op	what to put in the sack.
nrof	number of objects (op) we want to put in. We specify it separately instead of using op->nrof because often times, a player may have specified a certain number of objects to drop, so we can pass that number, and not need to use split_ob() and stuff.