bintree added

bintree.c

@@ -12,7 +12,57 @@
 // if isDuplicate is NULL, otherwise ignores duplicates and sets isDuplicate to 1 (or to 0 if a new entry is added).
 TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFctType compareFct, int *isDuplicate)
 {
+    if (isDuplicate)
+        *isDuplicate = 0;
 
+    // Wenn kein Knoten angelegt
+    if (root == NULL)
+    {
+        // Neuen Knoten erstellen
+        TreeNode *newNode = malloc(sizeof(TreeNode));
+        if (!newNode)
+            return NULL;
+        // mit Daten füllen
+        newNode->data = malloc(dataSize);
+        if (!(newNode->data))
+        {
+            free(newNode);
+            return NULL;
+        }
+
+        memcpy(newNode->data, data, dataSize);
+        newNode->left = NULL; // Kinder NULL setzen
+        newNode->right = NULL;
+        return newNode;
+    }
+    // auf Doppellungen überprüfen, daten/werte vergelichen
+    // int cmp = compareFct(data, root->data);
+
+    int cmp = compareFct(data, root->data);
+
+    if (cmp == 0) // Duplikat erkannt
+    {
+        if (isDuplicate) // nicht einfügen
+        {
+            *isDuplicate = 1;
+            return root;
+        }
+        else // einfügen erlaubt
+        {
+            root->right = addToTree(root->right, data, dataSize, compareFct, NULL);
+            return root;
+        }
+    }
+    // kein Duplikat
+    if (cmp < 0)
+    {
+        root->left = addToTree(root->left, data, dataSize, compareFct, isDuplicate);
+    }
+    else if (cmp > 0)
+    {
+        root->right = addToTree(root->right, data, dataSize, compareFct, isDuplicate);
+    }
+    return root;
 }
 
 // Iterates over the tree given by root. Follows the usage of strtok. If tree is NULL, the next entry of the last tree given is returned in ordering direction.
@@ -20,17 +70,64 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
 // push the top node and push all its left nodes.
 void *nextTreeData(TreeNode *root)
 {
+    static StackNode *stack = NULL; // Stack für Iterator
+    static TreeNode *lastRoot = NULL;
+    TreeNode *currentNode;
 
+    if (root != NULL) // Initialisierung bei erstem Aufruf
+    {
+        lastRoot = root;
+
+        if (stack)
+        {
+            freeStack(stack);
+            stack = NULL;
+        }
+
+        stack = createStack();
+
+        // alle linken Knoten vom Wurzelknoten pushen
+        currentNode = root;
+        while (currentNode)
+        {
+            push(stack, currentNode);
+            currentNode = currentNode->left;
+        }
+    }
+    // Stack ist leer, keine Daten mehr
+    if (!stack || isEmpty(stack))
+        return NULL;
+
+    TreeNode *newNode = pop(stack); // nächster Knoten
+
+    // Wenn rechter Teilbaum vorhanden → alle linken Knoten pushen
+    currentNode = newNode->right;
+    while (currentNode)
+    {
+        push(stack, currentNode);
+        currentNode = currentNode->left;
+    }
+    return newNode->data; // Daten zurückgeben
 }
 
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)
 {
-
+    if (root)
+    {
+        clearTree(root->left);
+        clearTree(root->right);
+        free(root->data);
+        free(root);
+    }
 }
 
 // Returns the number of entries in the tree given by root.
 unsigned int treeSize(const TreeNode *root)
 {
-
+    unsigned int size = 0;
+    if (root == NULL)
+        return 0;
+    size = 1 + treeSize(root->left) + treeSize(root->right);
+    return size;
 }