bintree added

I2_Dobble/bintree.c

@@ -8,11 +8,51 @@
     * `treeSize`: zählt die Knoten im Baum (rekursiv),
     * `nextTreeData`: Traversierung mit Hilfe des zuvor implementierten Stacks. */
 
+static StackNode *iteratorStack = NULL;
+
 // Adds a copy of data's pointer destination to the tree using compareFct for ordering. Accepts duplicates
 // 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 (root == NULL)
+    {
+        // Neue Node anlegen
+        TreeNode *newNode = malloc(sizeof(TreeNode));
+        if (!newNode) return NULL;
 
+        newNode->data = malloc(dataSize);
+        if(!newNode->data)
+        {
+            free(newNode);
+            return NULL;
+        }
+
+        memcpy(newNode->data, data, dataSize);
+
+        newNode->left = NULL;
+        newNode->right = NULL;
+
+        if (isDuplicate)
+            *isDuplicate = 0;
+
+        return newNode;
+    }
+
+    int cmp = compareFct(data, root->data);
+
+    if (cmp == 0)
+    {
+        if (isDuplicate)
+            *isDuplicate = 1;
+        return root;  // Einfügen verhindern
+    }
+
+    if (cmp < 0)
+        root->left = addToTree(root->left, data, dataSize, compareFct, isDuplicate);
+    else
+        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 +60,58 @@ 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)
 {
+    // Neues Traversieren?
+    if (root != NULL)
+    {
+        clearStack(iteratorStack);
+        iteratorStack = NULL;
 
+        // Root + alle linken Nachfolger pushen
+        TreeNode *current = root;
+        while (current != NULL)
+        {
+            iteratorStack = push(iteratorStack, current);
+            current = current->left;
+        }
+    }
+
+    // Wenn Stack leer → fertig
+    if (iteratorStack == NULL)
+        return NULL;
+
+    // Top-Node holen
+    TreeNode *node = (TreeNode *)top(iteratorStack);
+    iteratorStack = pop(iteratorStack);
+
+    // rechten Teilbaum + linke Kette pushen
+    TreeNode *right = node->right;
+    while (right != NULL)
+    {
+        iteratorStack = push(iteratorStack, right);
+        right = right->left;
+    }
+
+    return node->data;
 }
 
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)
 {
+    if (root != NULL)
+    {
+        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)
 {
+    if (root == NULL)
+        return 0;
 
+    return 1 + treeSize(root->left) + treeSize(root->right);
 }