linked list cleanups

added list methods invoke(), destroy_offset(), destroy_function()
simplified list destruction when destroying its items

src/charon/encoding/payloads/cp_payload.c

@@ -240,20 +240,11 @@ static config_type_t get_config_type (private_cp_payload_t *this)
 /**
  * Implementation of payload_t.destroy and cp_payload_t.destroy.
  */
-static status_t destroy(private_cp_payload_t *this)
+static void destroy(private_cp_payload_t *this)
 {
-	/* all attributes are getting destroyed */ 
-	while (this->attributes->get_count(this->attributes) > 0)
-	{
-		configuration_attribute_t *current_attribute;
-		this->attributes->remove_last(this->attributes,(void **)&current_attribute);
-		current_attribute->destroy(current_attribute);
-	}
-	this->attributes->destroy(this->attributes);
-	
+	this->attributes->destroy_offset(this->attributes,
+									 offsetof(configuration_attribute_t, destroy));
 	free(this);
-	
-	return SUCCESS;
 }
 
 /*

src/charon/encoding/payloads/encryption_payload.c

@@ -600,14 +600,7 @@ static status_t verify_signature(private_encryption_payload_t *this, chunk_t dat
  */
 static void destroy(private_encryption_payload_t *this)
 {
-	/* all proposals are getting destroyed */ 
-	while (this->payloads->get_count(this->payloads) > 0)
-	{
-		payload_t *current_payload;
-		this->payloads->remove_last(this->payloads,(void **)&current_payload);
-		current_payload->destroy(current_payload);
-	}
-	this->payloads->destroy(this->payloads);
+	this->payloads->destroy_offset(this->payloads, offsetof(payload_t, destroy));
 	free(this->encrypted.ptr);
 	free(this->decrypted.ptr);
 	free(this);

src/charon/encoding/payloads/proposal_substructure.c

@@ -472,28 +472,12 @@ static private_proposal_substructure_t* clone_(private_proposal_substructure_t *
  * Implements payload_t's and proposal_substructure_t's destroy function.
  * See #payload_s.destroy or proposal_substructure_s.destroy for description.
  */
-static status_t destroy(private_proposal_substructure_t *this)
+static void destroy(private_proposal_substructure_t *this)
 {
-	/* all proposals are getting destroyed */ 
-	while (this->transforms->get_count(this->transforms) > 0)
-	{
-		transform_substructure_t *current_transform;
-		if (this->transforms->remove_last(this->transforms,(void **)&current_transform) != SUCCESS)
-		{
-			break;
-		}
-		current_transform->destroy(current_transform);
-	}
-	this->transforms->destroy(this->transforms);
-	
-	if (this->spi.ptr != NULL)
-	{
-		free(this->spi.ptr);
-	}
-	
+	this->transforms->destroy_offset(this->transforms,
+									 offsetof(transform_substructure_t, destroy));
+	chunk_free(&this->spi);
 	free(this);
-	
-	return SUCCESS;
 }
 
 /*

src/charon/encoding/payloads/sa_payload.c

@@ -165,17 +165,9 @@ static status_t verify(private_sa_payload_t *this)
  */
 static status_t destroy(private_sa_payload_t *this)
 {
-	/* all proposals are getting destroyed */ 
-	while (this->proposals->get_count(this->proposals) > 0)
-	{
-		proposal_substructure_t *current_proposal;
-		this->proposals->remove_last(this->proposals,(void **)&current_proposal);
-		current_proposal->destroy(current_proposal);
-	}
-	this->proposals->destroy(this->proposals);
-	
+	this->proposals->destroy_offset(this->proposals,
+									offsetof(proposal_substructure_t, destroy));
 	free(this);
-	
 	return SUCCESS;
 }
 

src/charon/encoding/payloads/transform_substructure.c

@@ -354,15 +354,8 @@ static status_t get_key_length(private_transform_substructure_t *this, u_int16_t
  */
 static void destroy(private_transform_substructure_t *this)
 {
-	/* all proposals are getting destroyed */ 
-	while (this->attributes->get_count(this->attributes) > 0)
-	{
-		transform_attribute_t *current_attribute;
-		this->attributes->remove_last(this->attributes,(void **)&current_attribute);
-		current_attribute->destroy(current_attribute);
-	}
-	this->attributes->destroy(this->attributes);
-	
+	this->attributes->destroy_offset(this->attributes,
+									 offsetof(transform_attribute_t, destroy));
 	free(this);
 }
 

src/charon/encoding/payloads/ts_payload.c

@@ -280,18 +280,9 @@ static linked_list_t *get_traffic_selectors(private_ts_payload_t *this)
  */
 static void destroy(private_ts_payload_t *this)
 {
-	while (this->traffic_selectors->get_count(this->traffic_selectors) > 0)
-	{
-		payload_t *current_traffic_selector;
-		
-		this->traffic_selectors->remove_last(this->traffic_selectors,(void **) &current_traffic_selector);
-		
-		current_traffic_selector->destroy(current_traffic_selector);
-	}
-	
-	this->traffic_selectors->destroy(this->traffic_selectors);
-		
-	free(this);	
+	this->traffic_selectors->destroy_offset(this->traffic_selectors,
+											offsetof(payload_t, destroy));
+	free(this);
 }
 
 /*