Completed the conversion to the new linked-list type.

- Moved all code relating to skills to use the new linked-lists.
- Removed all old code relating to other lists.
- Improved linked lists to get nodes more efficiently in the second half of the list.

src/gamelogic.c

@@ -468,13 +468,15 @@ int evaluateNextCommand(gameLogicParameters * parameters, commandQueue * queue)
 		bzero(statMessage->messageContent, sizeof(char) * MAX);
 		if(currentCommand->caller->skills->head != NULL)
 		{			
-			skillNode * currentSkill = currentCommand->caller->skills->head;
+			size_t skillIndex = 0;
 			int charCount = 0;
 			bool addNewline = false;
-			while(currentSkill != NULL)
+			playerSkill * skill;
+			while(skillIndex < currentCommand->caller->skills->itemCount)
 			{
-				snprintf(formattedString, 120, "| %2d | %31s ",
+				skill = getFromList(currentCommand->caller->skills, skillIndex)->skill;
-						 currentSkill->skill->skillPoints, currentSkill->skill->skillName);
+				skillIndex++;
+				snprintf(formattedString, 120, "| %2d | %31s ", skill->skillPoints, skill->skillName);
 				charCount += 43;
 				strncat(statMessage->messageContent, formattedString, 120);
 				if((charCount + 43) >= MAX)
@@ -494,9 +496,7 @@ int evaluateNextCommand(gameLogicParameters * parameters, commandQueue * queue)
 				else
 				{
 					addNewline = true;
-				}
+				}		  
-				currentSkill = currentSkill->next;
-			
 			}
 			queueTargetedOutputMessage(parameters->outputQueue, statMessage, &currentCommand->caller, 1);
 		}
@@ -617,14 +617,16 @@ int evaluateNextCommand(gameLogicParameters * parameters, commandQueue * queue)
 	}
 	if(strncmp(currentCommand->command, "listskills", 10) == 0)
 	{
-		skillNode * currentSkill = parameters->globalSkillList->head;
 		userMessage * listMessage = calloc(1, sizeof(userMessage));
 		char * formattedString = calloc(121, sizeof(char));
 		int charCount = 0;
+		size_t skillIndex = 0;
 		bool addNewline = false;
-		while(currentSkill != NULL)
+		playerSkill * currentSkill;
+		while(skillIndex < parameters->globalSkillList->itemCount)
 		{
-			snprintf(formattedString, 120, "| %-31s ", currentSkill->skill->skillName);
+			currentSkill = getFromList(parameters->globalSkillList, skillIndex)->skill;
+			snprintf(formattedString, 120, "| %-31s ", currentSkill->skillName);
 			charCount += 43;
 			strncat(listMessage->messageContent, formattedString, 120);
 			if((charCount + 46) >= MAX)
@@ -644,7 +646,7 @@ int evaluateNextCommand(gameLogicParameters * parameters, commandQueue * queue)
 			{
 				addNewline = true;
 			}
-			currentSkill = currentSkill->next;
+			skillIndex++;
 		}
 		queueTargetedOutputMessage(parameters->outputQueue, listMessage, &currentCommand->caller, 1);
 		free(listMessage);
@@ -727,7 +729,7 @@ outcome statCheck(playerInfo * player, int chance, coreStat statToCheck)
 }
 
 // Run a skill check:
-outcome skillCheck(playerInfo * player, int chance, char * skillName, size_t skillNameLength, skillList * globalSkillList)
+outcome skillCheck(playerInfo * player, int chance, char * skillName, size_t skillNameLength, list * globalSkillList)
 {
 	// Calculate the chance:
 	if(chance > 100 || chance < 0)
@@ -738,46 +740,39 @@ outcome skillCheck(playerInfo * player, int chance, char * skillName, size_t ski
 
 	// Check if the player has the given skill:
 	bool playerHasSkill = false;
-	skillNode * currentPlayerNode = player->skills->head;
+	size_t playerIndex = 0;
-	while(currentPlayerNode != NULL)
+	while(playerIndex < player->skills->itemCount)
 	{
-		if(strncmp(skillName, currentPlayerNode->skill->skillName, skillNameLength) == 0)
+		if(strncmp(skillName, getFromList(player->skills, playerIndex)->skill->skillName, skillNameLength) != 0)
 		{
 			playerHasSkill = true;
 			break;
 		}
-		currentPlayerNode = currentPlayerNode->next;
+		playerIndex++;
 	}
 
 	// If the player doesn't have the skill, check if it's in the game and is trained:
 	bool trainedSkill = false;
-	if(!playerHasSkill)
+	size_t globalIndex = 0;
+	while(globalIndex < globalSkillList->itemCount)
 	{
-		skillNode * currentNode = globalSkillList->head;
+		if(strncmp(skillName, getFromList(globalSkillList, globalIndex)->skill->skillName, skillNameLength) != 0)
-		while(strncmp(skillName, currentNode->skill->skillName, 32) != 0)
 		{
-			if(currentNode->next == NULL)
+			trainedSkill = getFromList(globalSkillList, globalIndex)->skill->trainedSkill;
-			{
+			break;
-				fprintf(stderr, "Skill doesn't exist in skill list.\n");
-				return ERROR;
-			}
-			currentNode = currentNode->next;
-		}
-		if(currentNode->skill->trainedSkill == true)
-		{
-			trainedSkill = true;
 		}
+		globalIndex++;
 	}
-		
+	
 	// Calculate the modifier:
 	int modifier = 0;
 	if(trainedSkill)
 	{
 		modifier = -100;
 	}
-	else
+	else if(playerHasSkill)
 	{
-		modifier = currentPlayerNode->skill->skillPoints * 4;
+		modifier = getFromList(player->skills, playerIndex)->skill->skillModifier * 4;
 	}
 	
 	// Attempt the check:

src/gamelogic.h

@@ -20,7 +20,7 @@ typedef struct gameLogicParameters
 	playerInfo * connectedPlayers;
 	inputMessageQueue * inputQueue;
 	outputMessageQueue * outputQueue;
-	skillList * globalSkillList;
+	list * globalSkillList;
 } gameLogicParameters;
 
 // Thread function which runs the main game loop, given the needed parameters:
@@ -90,6 +90,6 @@ typedef enum outcome
 outcome statCheck(playerInfo * player, int chance, coreStat statToCheck);
 
 // Run a skill check:
-outcome skillCheck(playerInfo * player, int chance, char * skillName, size_t skillNameLength, skillList * globalSkillList);
+outcome skillCheck(playerInfo * player, int chance, char * skillName, size_t skillNameLength, list * globalSkillList);
 
 #endif

src/linkedlist.c

@@ -121,12 +121,24 @@ listNode * getNodeFromList(list * list, size_t listIndex)
 	// Loop through the entries in the list until we get to the right one:
 	else
 	{
-		listNode * currentNode = list->head;
+		if((list->itemCount / 2) < listIndex)
-		while(listIndex-- > 0)
 		{
-			currentNode = currentNode->next;
+			listNode * currentNode = list->tail;
+			while(listIndex-- > 0)
+			{
+				currentNode = currentNode->previous;
+			}
+			return currentNode;
+		}
+		else
+		{
+			listNode * currentNode = list->head;
+			while(listIndex-- > 0)
+			{
+				currentNode = currentNode->next;
+			}
+			return currentNode;
 		}
-		return currentNode;
 	}
 }
 

src/playerdata.c

@@ -9,12 +9,12 @@
 #include "playerdata.h"
 
 // Create a new skill and add it to the global skill list:
-int createSkill(skillList * globalSkillList, char * skillName, int skillNameLength, bool trainedSkill)
+listNode * createSkill(list * globalSkillList, char * skillName, int skillNameLength, bool trainedSkill)
 {
 	if(skillNameLength >= 32)
 	{
 		fprintf(stderr, "Skill name is too long. Please shorten the name and try again.\n");
-		return -1;
+		return NULL;
 	}
 	playerSkill * newSkill = malloc(sizeof(playerSkill));
 	
@@ -26,112 +26,56 @@ int createSkill(skillList * globalSkillList, char * skillName, int skillNameLeng
 	newSkill->trainedSkill = trainedSkill;
 	
 	// Add the skill to a node in the list:
-	return(addSkillNode(globalSkillList, newSkill));
+	return(addToList(globalSkillList, newSkill, SKILL));
-}
-
-// Add a skill node to a skill list:
-int addSkillNode(skillList * skillList, playerSkill * skill)
-{
-	if(skillList->head == NULL)
-	{
-		skillList->head = malloc(sizeof(skillNode));
-		skillList->head->skill = skill;
-		skillList->head->next = NULL;
-		skillList->skillCount = 1;
-		return 0;
-	}
- 	else
-	{
-		skillNode * currentNode = skillList->head;	
-		while(currentNode->next != NULL)
-		{
-			currentNode = currentNode->next;
-		}
-		currentNode->next = malloc(sizeof(skillNode));
-		currentNode->next->skill = skill;
-		currentNode->next->next = NULL;
-		skillList->skillCount++;
-		return skillList->skillCount;		
-	}
-}
-
-// Remove a skill node from a skill list:
-int removeSkillNode(skillList * skillList, playerSkill * skill)
-{
-	// Check the validity of the pointers:
-	if(skillList->head == NULL || skill == NULL)
-	{
-		return -1;
-	}
-
-	if(skillList->head->skill == skill)
-	{
-		skillNode * newHead = skillList->head->next;
-		free(skillList->head->skill);
-		free(skillList->head);
-		skillList->head = newHead;
-		return 0;
-	}
-	
-	else
-	{
-		skillNode * currentNode = skillList->head;
-		skillNode * previousNode = skillList->head;
-		while(currentNode->skill != skill)
-		{
-			if(currentNode->next == NULL)
-			{
-				return -1;
-			}
-			previousNode = currentNode;
-			currentNode = currentNode->next;
-		}
-		free(currentNode->skill);
-		previousNode->next = currentNode->next;
-		free(currentNode);
-		return 0;
-	}	
 }
 
 // Take a skill and add it to the player's skill list:
-int takeSkill(skillList * globalSkillList, char * skillName, int skillNameLength, playerInfo * targetPlayer)
+int takeSkill(list * globalSkillList, char * skillName, int skillNameLength, playerInfo * targetPlayer)
 {
-	
+	// Check if the skill exists in the game:
-	skillNode * currentNode = globalSkillList->head;
+	size_t globalIndex = 0;
-	while(strncmp(skillName, currentNode->skill->skillName, 32) != 0)
+	bool skillExists = false;
+	while(globalIndex < globalSkillList->itemCount)
 	{
-		if(currentNode->next == NULL)
+		if(strncmp(skillName, getFromList(globalSkillList, globalIndex)->skill->skillName, skillNameLength) == 0)
 		{
-			fprintf(stderr, "Skill doesn't exist in skill list.\n");
+			skillExists = true;
-			return -1;
+			break;
 		}
-		currentNode = currentNode->next;
+		globalIndex++;
 	}
 
-	bool playerHasSkill = false;
+	if(!skillExists)
-	skillNode * currentPlayerNode = targetPlayer->skills->head;
-	while(currentPlayerNode != NULL)
 	{
-		if(strncmp(skillName, currentPlayerNode->skill->skillName, skillNameLength) == 0)
+		fprintf(stderr, "Skill doesn't exist in skill list.\n");
+		return -1;
+	}
+
+	// Check if the player has the skill:
+	size_t playerIndex = 0;
+	bool playerHasSkill = false;
+	while(playerIndex < targetPlayer->skills->itemCount)
+	{
+		if(strncmp(skillName, getFromList(targetPlayer->skills, playerIndex)->skill->skillName, skillNameLength) == 0)
 		{
 			playerHasSkill = true;
 			break;
 		}
-		currentPlayerNode = currentPlayerNode->next;
+		playerIndex++;
 	}
 	if(playerHasSkill)
 	{
-		currentPlayerNode->skill->skillPoints++;
+		getFromList(targetPlayer->skills, playerIndex)->skill->skillPoints++;
 	}
+
+	// Copy the skill into the player's skill list:
 	else
 	{
-		addSkillNode(targetPlayer->skills, currentNode->skill);
+		playerSkill * newSkill = calloc(1, sizeof(playerSkill));
-		currentPlayerNode = targetPlayer->skills->head;
+		strncpy(newSkill->skillName, getFromList(globalSkillList, globalIndex)->skill->skillName, 32);
-		while(currentPlayerNode->next != NULL)
+		printf("%s ", newSkill->skillName);
-		{
+		newSkill->skillPoints = 1;
-			currentPlayerNode = currentPlayerNode->next;
+		addToList(targetPlayer->skills, newSkill, SKILL);		
-		}
-		currentPlayerNode->skill->skillPoints = 1;
 	}
 	return 0;
 }
@@ -268,25 +212,7 @@ coreStat getCoreStatFromString(char * inputString, int stringLength)
 int deallocatePlayer(playerInfo * playerToDeallocate)
 {
 	// Deallocate the skill list:
-	if(playerToDeallocate->skills->skillCount > 0)
+	destroyList(&(playerToDeallocate->skills));
-	{
-		// Allocate enough pointers:
-		skillNode * nodesToDeallocate[playerToDeallocate->skills->skillCount];
-		skillNode * currentSkillNode = playerToDeallocate->skills->head;
-
-		// Get a list of all the nodes together:
-		for(int index = 0; index < playerToDeallocate->skills->skillCount; index++)
-		{
-			nodesToDeallocate[index] = currentSkillNode;
-			currentSkillNode = currentSkillNode->next;
-		}
-
-		// Deallocate all the nodes:
-		for(int index = 0; index < playerToDeallocate->skills->skillCount; index++)
-		{
-			free(nodesToDeallocate[index]);
-		}		
-	}
 
 	// Deallocate the stat block:
 	free(playerToDeallocate->stats);

src/playerdata.h

@@ -11,6 +11,8 @@
 // Let the compiler know there will be structs defined elsewhere:
 typedef struct playerPath playerPath;
 typedef struct playerArea playerArea;
+typedef struct list list;
+typedef struct listNode listNode;
 
 typedef struct statBlock
 {
@@ -42,25 +44,12 @@ typedef struct playerSkill
 	bool trainedSkill;
 } playerSkill;
 
-typedef struct skillNode skillNode;
-struct skillNode
-{
-	playerSkill * skill;
-	skillNode * next;
-};
-
-typedef struct skillList
-{
-	skillNode * head;
-	int skillCount;
-} skillList;
-
 typedef struct playerInfo
 {
 	char playerName[32];
 	playerArea * currentArea;
 	statBlock * stats;
-	skillList * skills; 
+	list * skills; 
 } playerInfo;
 
 typedef enum coreStat
@@ -74,18 +63,11 @@ typedef enum coreStat
 } coreStat;
 
 // Create a new skill and add it to the global skill list:
-int createSkill(skillList * globalSkillList, char * skillName, int skillNameLength, bool trainedSkill);
+listNode * createSkill(list * globalSkillList, char * skillName, int skillNameLength, bool trainedSkill);
-
-// Add a skill node to a skill list:
-int addSkillNode(skillList * skillList, playerSkill * skill);
-
-// Remove a skill node from a skill list:
-int removeSkillNode(skillList * skillList, playerSkill * skill);
-int removeSkillByID(skillList * skillList, playerSkill * skill);
 
 // Take a skill and add it to the player's skill list:
-int takeSkill(skillList * globalSkillList, char * skillName, int skillNameLength, playerInfo * targetPlayer); 
+int takeSkill(list * globalSkillList, char * skillName, int skillNameLength, playerInfo * targetPlayer); 
-int takeSkillbyID(skillList * globalSkillList, int skillID, playerInfo * targetPlayer);
+int takeSkillbyID(list * globalSkillList, int skillID, playerInfo * targetPlayer);
 
 // Take a string containing a core stat name and return the core stat:
 coreStat getCoreStatFromString(char * string, int stringLength);

src/server/SilverMUDServer.c

@@ -94,8 +94,7 @@ int main(int argc, char ** argv)
   	createOneWayPath(getFromList(areas, 2)->area, getFromList(areas, 3)->area,
 					 "Continue to station interior. ");
 	
-	skillList * globalSkillList = malloc(sizeof(skillList));
+	list * globalSkillList = createList(SKILL);
-	globalSkillList->head = NULL;
 
 	// Create a few basic skills:
 	createSkill(globalSkillList, "Medicine", 8, true);
@@ -116,8 +115,7 @@ int main(int argc, char ** argv)
 		connectedPlayers[index].stats = calloc(1, sizeof(statBlock));
 		connectedPlayers[index].stats->specPoints = 30;
 		connectedPlayers[index].stats->skillPoints = 30;
-		connectedPlayers[index].skills = calloc(1, sizeof(skillList));
+		connectedPlayers[index].skills = createList(SKILL);
-		connectedPlayers[index].skills->head = NULL;
 	}
 
 	// -==[ TEST GAME-STATE INITIALIZATION END ]==-