Fixed some things in stack.c, first test working

highscores.txt

@@ -1 +1,2 @@
+Lukas;4985
 player1;3999

makefile

@@ -35,7 +35,9 @@ $(program_obj_filesobj_files): %.o: %.c
 # --------------------------
 # Unit Tests
 # --------------------------
-unitTests:
+stackTests: stack.o test_stack.c $(unityfolder)/unity.c
+	$(CC) $(CFLAGS) -I$(unityfolder) -o runStackTests test_stack.c stack.o $(unityfolder)/unity.c
+
 	echo "needs to be implemented"
 
 # --------------------------

stack.c

@@ -10,6 +10,22 @@
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data)
 {
+    if(!(stack)) { // check if stack is empty
+        stack = malloc(sizeof(StackNode));
+        if(!stack)
+            return NULL;
+        stack->stackData = data;
+        stack->below = NULL;
+        return stack;
+    }
+
+    StackNode* newStack = malloc(sizeof(StackNode));
+        if(!newStack)
+            return stack;
+    newStack->below = stack;
+    newStack->stackData = data;
+    stack = newStack;
+    return stack;
 
 }
 
@@ -17,17 +33,32 @@ StackNode *push(StackNode *stack, void *data)
 // freed by caller.)
 StackNode *pop(StackNode *stack)
 {
-
+    if(stack) {
+        StackNode* temp = stack;
+        stack = stack->below;
+        temp->stackData = NULL;
+        free(temp);
+        temp = NULL;
+        return stack;
+    } else {
+        return NULL;
+    }
 }
 
 // Returns the data of the top element.
 void *top(StackNode *stack)
 {
+    if(stack)
+        return stack->stackData;
+    else
+        return NULL;
 
 }
 
 // Clears stack and releases all memory.
 void clearStack(StackNode *stack)
 {
+    while(stack)
+        stack = pop(stack);
 
 }

stack.h

@@ -9,6 +9,11 @@ The latest element is taken from the stack. */
 
 //TODO: passenden Datentyp als struct anlegen
 
+typedef struct StackNode {
+    struct StackNode* below;
+    void* stackData;
+} StackNode;
+
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data);
 

test_stack.c

@@ -0,0 +1,37 @@
+#include "stack.h"
+#include "unity.h"
+
+
+void test_firstNodeAddedCorrectly(void) {
+    printf("\nStarting first test...\n");
+    StackNode* modelStack = malloc(sizeof(StackNode));
+    int modelData = 5;
+    modelStack->below = NULL;
+    modelStack->stackData = &modelData;
+
+    StackNode* testStack = NULL;
+    int testData = 5;
+    testStack = push(testStack, &testData);
+    TEST_ASSERT_EQUAL_INT(*(int*)modelStack->stackData, *(int*)testStack->stackData);
+    TEST_ASSERT_NULL(testStack->below);
+    clearStack(modelStack);
+    clearStack(testStack);
+}
+
+void setUp(void) {
+
+}
+
+void tearDown(void) {
+
+}
+
+int main(void) {
+
+    UNITY_BEGIN();
+
+    printf("\n----------------------------Stack-Tests----------------------------\n");
+    RUN_TEST(test_firstNodeAddedCorrectly);
+
+    return UNITY_END();
+}