StaminaHandler Class Reference

Private Member Functions
void	StaminaHandler (PlayerBase player)
void	Init ()
void	ActivateDepletionModifier (EStaminaMultiplierTypes type)
void	DeactivateDepletionModifier (EStaminaMultiplierTypes type)
void	RecalculateDepletionMultiplier ()
void	ActivateRecoveryModifier (EStaminaMultiplierTypes type)
void	DeactivateRecoveryModifier (EStaminaMultiplierTypes type)
void	RecalculateRecoveryMultiplier ()
void	Update (float deltaT, int pCurrentCommandID)
void	OnRPC (float stamina, float stamina_cap, bool cooldown)
	deprecated use, StaminaHandler uses SyncJunctures now
void	OnSyncJuncture (int pJunctureID, ParamsReadContext pCtx)
	called from PlayerBase - syncs stamina values on server with client AND sets the value to match on server and client both (m_StaminaSynced guarantees identical values)
protected void	StaminaProcessor_Move (HumanMovementState pHumanMovementState)
protected void	StaminaProcessor_Ladder (HumanMovementState pHumanMovementState)
protected void	StaminaProcessor_Swimming (HumanMovementState pHumanMovementState)
protected void	SyncStamina (float stamina, float stamina_cap, bool cooldown)
	stamina sync - server part
protected void	SyncAdditionalStaminaInfo (Param par)
	Method to sync more info for stamina manager. Template parameter means it is very extendable for further use.
protected void	ReadAdditionalStaminaInfo (ParamsReadContext pCtx)
	Order of read parameters must match the order of writing above.
protected void	RegisterStaminaConsumers ()
protected void	RegisterStaminaModifiers ()
protected float	CalcStaminaGainBonus ()
	Calulates stamina regain bonus coef based on current stamina cap and level.
protected void	ApplyExhaustion ()
protected void	CheckStaminaState ()
	check if the stamina is completely depleted
protected void	SetCooldown (float time, int modifier=-1)
	set cooldown timer between each consume of stamina
protected void	ResetCooldown (int modifier=-1)
Timer	GetCooldownTimer (int modifier)
bool	HasEnoughStaminaFor (EStaminaConsumers consumer)
bool	HasEnoughStaminaToStart (EStaminaConsumers consumer)
void	SetStamina (float stamina_value)
float	GetStamina ()
float	GetStaminaNormalized ()
float	GetSyncedStamina ()
float	GetSyncedStaminaNormalized ()
float	GetStaminaCap ()
float	GetStaminaMax ()
void	SetDepletionMultiplier (float val)
void	SetRecoveryMultiplier (float val)
float	GetDepletionMultiplier ()
float	GetRecoveryMultiplier ()
void	DepleteStaminaEx (EStaminaModifiers modifier, float dT=-1, float coef=1.0)
void	DepleteStamina (EStaminaModifiers modifier, float dT=-1)
	Deprecated.

Private Attributes
protected float	m_PlayerLoad
protected float	m_StaminaDelta
protected float	m_Stamina
protected float	m_StaminaSynced
protected float	m_StaminaCap
protected float	m_StaminaDepletion
protected float	m_StaminaDepletionMultiplier
protected float	m_StaminaRecoveryMultiplier
protected float	m_Time
protected ref Param3< float, float, bool >	m_StaminaParams
protected ref HumanMovementState	m_State
protected SHumanCommandMoveSettings	m_HumanMoveSettings
protected PlayerBase	m_Player
protected bool	m_Debug
protected bool	m_StaminaDepleted
	DEPRECATED.
protected ref map< int, ref Timer >	m_TimerMap
ref map< EStaminaMultiplierTypes, float >	m_RegisteredDepletionModifiers
ref set< EStaminaMultiplierTypes >	m_ActiveDepletionModifiers
ref map< EStaminaMultiplierTypes, float >	m_RegisteredRecoveryModifiers
ref set< EStaminaMultiplierTypes >	m_ActiveRecoveryModifiers
protected bool	m_IsInCooldown
protected ref StaminaConsumers	m_StaminaConsumers
protected ref StaminaModifiers	m_StaminaModifiers

Constructor & Destructor Documentation

StaminaHandler()

void StaminaHandler ( PlayerBase  player )

inlineprivate

References GetGame(), CfgGameplayHandler::GetStaminaMax(), Init(), m_ActiveDepletionModifiers, m_ActiveRecoveryModifiers, m_HumanMoveSettings, m_IsInCooldown, m_Player, m_RegisteredDepletionModifiers, m_RegisteredRecoveryModifiers, m_Stamina, m_StaminaCap, m_StaminaDepleted, m_StaminaDepletion, m_StaminaDepletionMultiplier, m_StaminaParams, m_StaminaRecoveryMultiplier, m_State, m_Time, m_TimerMap, RegisterStaminaConsumers(), and RegisterStaminaModifiers().

Member Function Documentation

ActivateDepletionModifier()

void ActivateDepletionModifier ( EStaminaMultiplierTypes  type )

inlineprivate

References Error(), m_ActiveDepletionModifiers, m_RegisteredDepletionModifiers, and RecalculateDepletionMultiplier().

ActivateRecoveryModifier()

void ActivateRecoveryModifier ( EStaminaMultiplierTypes  type )

inlineprivate

References Error(), m_ActiveRecoveryModifiers, m_RegisteredRecoveryModifiers, and RecalculateRecoveryMultiplier().

ApplyExhaustion()

protected void ApplyExhaustion ( )

inlineprivate

sets exhaustion look of player based on stamina level

References HumanCommandAdditives(), m_Player, m_Stamina, m_StaminaCap, and Math::Min().

Referenced by Update().

CalcStaminaGainBonus()

protected float CalcStaminaGainBonus ( )

inlineprivate

Calulates stamina regain bonus coef based on current stamina cap and level.

References m_Stamina, m_StaminaDepletion, Math::Min(), and GameConstants::STAMINA_GAIN_BONUS_CAP.

Referenced by StaminaProcessor_Ladder(), StaminaProcessor_Move(), and StaminaProcessor_Swimming().

CheckStaminaState()

protected void CheckStaminaState ( )

inlineprivate

check if the stamina is completely depleted

in case of complete depletion - start a cooldown timer before the regeneration cycle start

References m_IsInCooldown, m_Stamina, m_StaminaDepleted, SetCooldown(), and GameConstants::STAMINA_REGEN_COOLDOWN_EXHAUSTION.

Referenced by Update().

DeactivateDepletionModifier()

void DeactivateDepletionModifier ( EStaminaMultiplierTypes  type )

inlineprivate

References m_ActiveDepletionModifiers, and RecalculateDepletionMultiplier().

DeactivateRecoveryModifier()

void DeactivateRecoveryModifier ( EStaminaMultiplierTypes  type )

inlineprivate

References m_ActiveRecoveryModifiers, and RecalculateRecoveryMultiplier().

DepleteStamina()

void DepleteStamina ( EStaminaModifiers  modifier, float  dT = -1  )

inlineprivate

Deprecated.

References DepleteStaminaEx().

DepleteStaminaEx()

void DepleteStaminaEx ( EStaminaModifiers  modifier, float  dT = -1, float  coef = 1.0  )

inlineprivate

run cooldown right after depletion

References Math::AbsFloat(), Class::CastTo(), Math::Clamp(), ErrorEx, StaminaModifierExponential::GetBaseValue(), StaminaModifierExponential::GetDurationAdjusted(), StaminaModifierExponential::GetExponent(), StaminaModifierExponential::GetMultiplier(), CfgGameplayHandler::GetStaminaMax(), StaminaModifierExponential::GetStartTimeAdjustment(), Math::Lerp(), m_Player, m_StaminaDepletion, m_StaminaDepletionMultiplier, m_StaminaModifiers, Math::Max(), Math::Min(), Math::Pow(), Math::RandomFloat(), SetCooldown(), and StaminaModifier().

Referenced by DepleteStamina().

GetCooldownTimer()

Timer GetCooldownTimer ( int  modifier )

inlineprivate

GetDepletionMultiplier()

float GetDepletionMultiplier ( )

inlineprivate

References m_StaminaDepletionMultiplier.

GetRecoveryMultiplier()

float GetRecoveryMultiplier ( )

inlineprivate

References m_StaminaRecoveryMultiplier.

GetStamina()

float GetStamina ( )

inlineprivate

References m_Stamina.

GetStaminaCap()

float GetStaminaCap ( )

inlineprivate

References m_StaminaCap.

GetStaminaMax()

float GetStaminaMax ( )

inlineprivate

References CfgGameplayHandler::GetStaminaMax().

Referenced by GetStaminaNormalized(), and GetSyncedStaminaNormalized().

GetStaminaNormalized()

float GetStaminaNormalized ( )

inlineprivate

References GetStaminaMax(), and m_Stamina.

GetSyncedStamina()

float GetSyncedStamina ( )

inlineprivate

References m_StaminaSynced.

Referenced by GetSyncedStaminaNormalized().

GetSyncedStaminaNormalized()

float GetSyncedStaminaNormalized ( )

inlineprivate

References GetStaminaMax(), and GetSyncedStamina().

HasEnoughStaminaFor()

bool HasEnoughStaminaFor ( EStaminaConsumers  consumer )

inlineprivate

References StaminaConsumers::HasEnoughStaminaFor(), m_StaminaCap, m_StaminaConsumers, m_StaminaDepleted, and m_StaminaSynced.

HasEnoughStaminaToStart()

bool HasEnoughStaminaToStart ( EStaminaConsumers  consumer )

inlineprivate

References StaminaConsumers::HasEnoughStaminaToStart(), m_StaminaCap, m_StaminaConsumers, m_StaminaDepleted, and m_StaminaSynced.

Init()

void Init ( )

inlineprivate

References m_RegisteredDepletionModifiers, m_RegisteredRecoveryModifiers, MaskMdfr::STAMINA_DEPLETION_MODIFIER, FatigueMdfr::STAMINA_DEPLETION_MULTIPLIER, PneumoniaMdfr::STAMINA_DEPLETION_MULTIPLIER, EpinephrineMdfr::STAMINA_DEPLETION_MULTIPLIER, VomitSymptom::STAMINA_DEPLETION_MULTIPLIER, MaskMdfr::STAMINA_RECOVERY_MODIFIER, FatigueMdfr::STAMINA_RECOVERY_MULTIPLIER, PneumoniaMdfr::STAMINA_RECOVERY_MULTIPLIER, DrowningMdfr::STAMINA_RECOVERY_MULTIPLIER, and VomitSymptom::STAMINA_RECOVERY_MULTIPLIER.

Referenced by StaminaHandler().

OnRPC()

void OnRPC ( float  stamina, float  stamina_cap, bool  cooldown  )

inlineprivate

deprecated use, StaminaHandler uses SyncJunctures now

OnSyncJuncture()

void OnSyncJuncture ( int  pJunctureID, ParamsReadContext  pCtx  )

inlineprivate

called from PlayerBase - syncs stamina values on server with client AND sets the value to match on server and client both (m_StaminaSynced guarantees identical values)

References m_IsInCooldown, m_Player, m_Stamina, m_StaminaCap, m_StaminaSynced, Serializer::Read(), ReadAdditionalStaminaInfo(), DayZPlayerSyncJunctures::SJ_STAMINA, and DayZPlayerSyncJunctures::SJ_STAMINA_MISC.

Referenced by ManBase::OnSyncJuncture().

ReadAdditionalStaminaInfo()

protected void ReadAdditionalStaminaInfo ( ParamsReadContext  pCtx )

inlineprivate

Order of read parameters must match the order of writing above.

References m_StaminaDepletionMultiplier, m_StaminaRecoveryMultiplier, and Serializer::Read().

Referenced by OnSyncJuncture().

RecalculateDepletionMultiplier()

void RecalculateDepletionMultiplier ( )

inlineprivate

References m_ActiveDepletionModifiers, m_RegisteredDepletionModifiers, m_StaminaDepletionMultiplier, and SetDepletionMultiplier().

Referenced by ActivateDepletionModifier(), and DeactivateDepletionModifier().

RecalculateRecoveryMultiplier()

void RecalculateRecoveryMultiplier ( )

inlineprivate

References m_ActiveRecoveryModifiers, m_RegisteredRecoveryModifiers, m_StaminaRecoveryMultiplier, and SetRecoveryMultiplier().

Referenced by ActivateRecoveryModifier(), and DeactivateRecoveryModifier().

RegisterStaminaConsumers()

protected void RegisterStaminaConsumers ( )

inlineprivate

References CfgGameplayHandler::GetStaminaMinCap(), m_StaminaConsumers, StaminaConsumers::RegisterConsumer(), GameConstants::STAMINA_CLIMB_THRESHOLD, GameConstants::STAMINA_HOLD_BREATH_THRESHOLD_ACTIVATE, GameConstants::STAMINA_HOLD_BREATH_THRESHOLD_DRAIN, GameConstants::STAMINA_JUMP_THRESHOLD, GameConstants::STAMINA_MELEE_EVADE_THRESHOLD, GameConstants::STAMINA_MELEE_HEAVY_THRESHOLD, GameConstants::STAMINA_ROLL_THRESHOLD, and GameConstants::STAMINA_VAULT_THRESHOLD.

Referenced by StaminaHandler().

RegisterStaminaModifiers()

protected void RegisterStaminaModifiers ( )

inlineprivate

References CfgGameplayHandler::GetMeleeStaminaModifier(), CfgGameplayHandler::GetObstacleTraversalStaminaModifier(), CfgGameplayHandler::GetStaminaMax(), m_StaminaModifiers, GameConstants::STAMINA_DRAIN_CLIMB, GameConstants::STAMINA_DRAIN_JUMP, GameConstants::STAMINA_DRAIN_MELEE_EVADE, GameConstants::STAMINA_DRAIN_MELEE_HEAVY, GameConstants::STAMINA_DRAIN_MELEE_LIGHT, GameConstants::STAMINA_DRAIN_ROLL, GameConstants::STAMINA_DRAIN_VAULT, and StaminaModifiers().

Referenced by StaminaHandler().

ResetCooldown()

protected void ResetCooldown ( int  modifier = -1 )

inlineprivate

References m_IsInCooldown, m_StaminaModifiers, and StaminaModifier().

Referenced by SetCooldown().

SetCooldown()

protected void SetCooldown ( float  time, int  modifier = -1  )

inlineprivate

set cooldown timer between each consume of stamina

References m_IsInCooldown, m_Stamina, m_StaminaDepleted, m_TimerMap, ResetCooldown(), and Timer::Stop().

Referenced by CheckStaminaState(), DepleteStaminaEx(), StaminaProcessor_Ladder(), StaminaProcessor_Move(), and StaminaProcessor_Swimming().

SetDepletionMultiplier()

void SetDepletionMultiplier ( float  val )

inlineprivate

References m_StaminaDepletionMultiplier, m_StaminaRecoveryMultiplier, and SyncAdditionalStaminaInfo().

Referenced by RecalculateDepletionMultiplier().

SetRecoveryMultiplier()

void SetRecoveryMultiplier ( float  val )

inlineprivate

References m_StaminaDepletionMultiplier, m_StaminaRecoveryMultiplier, and SyncAdditionalStaminaInfo().

Referenced by RecalculateRecoveryMultiplier().

SetStamina()

void SetStamina ( float  stamina_value )

inlineprivate

References Math::Clamp(), CfgGameplayHandler::GetStaminaMax(), m_IsInCooldown, m_Stamina, m_StaminaCap, and SyncStamina().

Referenced by ManBase::EEHitBy(), ManBase::ResetPlayer(), and Update().

StaminaProcessor_Ladder()

protected void StaminaProcessor_Ladder ( HumanMovementState  pHumanMovementState )

inlineprivate

References CalcStaminaGainBonus(), CfgGameplayHandler::GetSprintLadderStaminaModifier(), HumanMovementState::m_iMovement, m_IsInCooldown, m_StaminaDelta, SetCooldown(), GameConstants::STAMINA_DRAIN_LADDER_FAST_PER_SEC, GameConstants::STAMINA_GAIN_IDLE_PER_SEC, GameConstants::STAMINA_GAIN_LADDER_PER_SEC, and GameConstants::STAMINA_REGEN_COOLDOWN_DEPLETION.

Referenced by Update().

StaminaProcessor_Move()

protected void StaminaProcessor_Move ( HumanMovementState  pHumanMovementState )

inlineprivate

References CalcStaminaGainBonus(), CfgGameplayHandler::GetSprintStaminaModifierCro(), CfgGameplayHandler::GetSprintStaminaModifierErc(), m_HumanMoveSettings, HumanMovementState::m_iMovement, m_IsInCooldown, HumanMovementState::m_iStanceIdx, m_Player, m_StaminaDelta, SetCooldown(), GameConstants::STAMINA_DRAIN_CROUCHED_SPRINT_PER_SEC, GameConstants::STAMINA_DRAIN_STANDING_SPRINT_PER_SEC, GameConstants::STAMINA_GAIN_IDLE_PER_SEC, GameConstants::STAMINA_GAIN_JOG_PER_SEC, GameConstants::STAMINA_GAIN_ROLL_PER_SEC, GameConstants::STAMINA_GAIN_WALK_PER_SEC, and GameConstants::STAMINA_REGEN_COOLDOWN_DEPLETION.

Referenced by Update().

StaminaProcessor_Swimming()

protected void StaminaProcessor_Swimming ( HumanMovementState  pHumanMovementState )

inlineprivate

References CalcStaminaGainBonus(), CfgGameplayHandler::GetSprintSwimmingStaminaModifier(), HumanMovementState::m_iMovement, m_IsInCooldown, m_StaminaDelta, SetCooldown(), GameConstants::STAMINA_DRAIN_SWIM_FAST_PER_SEC, GameConstants::STAMINA_GAIN_IDLE_PER_SEC, GameConstants::STAMINA_GAIN_SWIM_PER_SEC, and GameConstants::STAMINA_REGEN_COOLDOWN_DEPLETION.

Referenced by Update().

SyncAdditionalStaminaInfo()

protected void SyncAdditionalStaminaInfo ( Param  par )

inlineprivate

Method to sync more info for stamina manager. Template parameter means it is very extendable for further use.

References m_Player, DayZPlayerSyncJunctures::SJ_STAMINA_MISC, and Serializer::Write().

Referenced by SetDepletionMultiplier(), and SetRecoveryMultiplier().

SyncStamina()

protected void SyncStamina ( float  stamina, float  stamina_cap, bool  cooldown  )

inlineprivate

stamina sync - server part

References m_IsInCooldown, m_Player, m_Stamina, m_StaminaCap, DayZPlayerSyncJunctures::SJ_STAMINA, and Serializer::Write().

Referenced by SetStamina().

Update()

void Update ( float  deltaT, int  pCurrentCommandID  )

inlineprivate

gets the actual players load

StaminaCap calculation starts when PlayerLoad exceeds STAMINA_WEIGHT_LIMIT_THRESHOLD

processed on event

processed on event

processed on event

References ApplyExhaustion(), CheckStaminaState(), GetGame(), CfgGameplayHandler::GetStaminaKgToStaminaPercentPenalty(), CfgGameplayHandler::GetStaminaMax(), CfgGameplayHandler::GetStaminaMinCap(), CfgGameplayHandler::GetStaminaWeightLimitThreshold(), CGame::IsMultiplayer(), CGame::IsServer(), HumanMovementState::m_CommandTypeId, m_IsInCooldown, m_Player, m_PlayerLoad, m_Stamina, m_StaminaCap, m_StaminaDelta, m_StaminaDepletion, m_StaminaDepletionMultiplier, m_StaminaRecoveryMultiplier, m_StaminaSynced, m_State, m_Time, Math::Max(), Math::Min(), SetStamina(), GameConstants::STAMINA_GAIN_IDLE_PER_SEC, GameConstants::STAMINA_KG_TO_GRAMS, GameConstants::STAMINA_SYNC_RATE, StaminaProcessor_Ladder(), StaminaProcessor_Move(), and StaminaProcessor_Swimming().

Referenced by ManBase::CommandHandler().

Field Documentation

m_ActiveDepletionModifiers

ref set<EStaminaMultiplierTypes> m_ActiveDepletionModifiers

private

Referenced by ActivateDepletionModifier(), DeactivateDepletionModifier(), RecalculateDepletionMultiplier(), and StaminaHandler().

m_ActiveRecoveryModifiers

ref set<EStaminaMultiplierTypes> m_ActiveRecoveryModifiers

private

Referenced by ActivateRecoveryModifier(), DeactivateRecoveryModifier(), RecalculateRecoveryMultiplier(), and StaminaHandler().

m_Debug

protected bool m_Debug

private

m_HumanMoveSettings

protected SHumanCommandMoveSettings m_HumanMoveSettings

private

Referenced by StaminaHandler(), and StaminaProcessor_Move().

m_IsInCooldown

protected bool m_IsInCooldown

private

Referenced by CheckStaminaState(), OnSyncJuncture(), ResetCooldown(), SetCooldown(), SetStamina(), StaminaHandler(), StaminaProcessor_Ladder(), StaminaProcessor_Move(), StaminaProcessor_Swimming(), SyncStamina(), and Update().

m_Player

protected PlayerBase m_Player

private

Referenced by ApplyExhaustion(), DepleteStaminaEx(), OnSyncJuncture(), StaminaHandler(), StaminaProcessor_Move(), SyncAdditionalStaminaInfo(), SyncStamina(), and Update().

m_PlayerLoad

protected float m_PlayerLoad

private

Referenced by Update().

m_RegisteredDepletionModifiers

ref map<EStaminaMultiplierTypes, float> m_RegisteredDepletionModifiers

private

Referenced by ActivateDepletionModifier(), Init(), RecalculateDepletionMultiplier(), and StaminaHandler().

m_RegisteredRecoveryModifiers

ref map<EStaminaMultiplierTypes, float> m_RegisteredRecoveryModifiers

private

Referenced by ActivateRecoveryModifier(), Init(), RecalculateRecoveryMultiplier(), and StaminaHandler().

m_Stamina

protected float m_Stamina

private

Referenced by ApplyExhaustion(), CalcStaminaGainBonus(), CheckStaminaState(), GetStamina(), GetStaminaNormalized(), OnSyncJuncture(), SetCooldown(), SetStamina(), StaminaHandler(), SyncStamina(), and Update().

m_StaminaCap

protected float m_StaminaCap

private

Referenced by ApplyExhaustion(), GetStaminaCap(), HasEnoughStaminaFor(), HasEnoughStaminaToStart(), OnSyncJuncture(), SetStamina(), StaminaHandler(), SyncStamina(), and Update().

m_StaminaConsumers

protected ref StaminaConsumers m_StaminaConsumers

private

Referenced by HasEnoughStaminaFor(), HasEnoughStaminaToStart(), and RegisterStaminaConsumers().

m_StaminaDelta

protected float m_StaminaDelta

private

Referenced by StaminaProcessor_Ladder(), StaminaProcessor_Move(), StaminaProcessor_Swimming(), and Update().

m_StaminaDepleted

protected bool m_StaminaDepleted

private

DEPRECATED.

Referenced by CheckStaminaState(), HasEnoughStaminaFor(), HasEnoughStaminaToStart(), SetCooldown(), and StaminaHandler().

m_StaminaDepletion

protected float m_StaminaDepletion

private

Referenced by CalcStaminaGainBonus(), DepleteStaminaEx(), StaminaHandler(), and Update().

m_StaminaDepletionMultiplier

protected float m_StaminaDepletionMultiplier

private

Referenced by DepleteStaminaEx(), GetDepletionMultiplier(), ReadAdditionalStaminaInfo(), RecalculateDepletionMultiplier(), SetDepletionMultiplier(), SetRecoveryMultiplier(), StaminaHandler(), and Update().

m_StaminaModifiers

protected ref StaminaModifiers m_StaminaModifiers

private

Referenced by DepleteStaminaEx(), RegisterStaminaModifiers(), and ResetCooldown().

m_StaminaParams

protected ref Param3<float,float,bool> m_StaminaParams

private

Referenced by StaminaHandler().

m_StaminaRecoveryMultiplier

protected float m_StaminaRecoveryMultiplier

private

Referenced by GetRecoveryMultiplier(), ReadAdditionalStaminaInfo(), RecalculateRecoveryMultiplier(), SetDepletionMultiplier(), SetRecoveryMultiplier(), StaminaHandler(), and Update().

m_StaminaSynced

protected float m_StaminaSynced

private

Referenced by GetSyncedStamina(), HasEnoughStaminaFor(), HasEnoughStaminaToStart(), OnSyncJuncture(), and Update().

m_State

protected ref HumanMovementState m_State

private

Referenced by StaminaHandler(), and Update().

m_Time

protected float m_Time

private

Referenced by StaminaHandler(), and Update().

m_TimerMap

protected ref map<int,ref Timer> m_TimerMap

private

Referenced by SetCooldown(), and StaminaHandler().

---

The documentation for this class was generated from the following file:

• P:/scripts/4_World/Classes/StaminaHandler.c