在 C 中存储 int* 的堆栈实现

C中有一个实现的堆栈数据结构。

// C program for array implementation of stack
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

// A structure to represent a stack
struct Stack
{
    int top;
    unsigned capacity;
    int* array;
};

// function to create a stack of given capacity. It initializes size of
// stack as 0
struct Stack* createStack(unsigned capacity)
{
    struct Stack* stack = (struct Stack*) malloc(sizeof(struct Stack));
    stack->capacity = capacity;
    stack->top = -1;
    stack->array = (int*) malloc(stack->capacity * sizeof(int));
    return stack;
}

// Stack is full when top is equal to the last index
int isFull(struct Stack* stack)
{   return stack->top == stack->capacity - 1; }

// Stack is empty when top is equal to -1
int isEmpty(struct Stack* stack)
{   return stack->top == -1;  }

// Function to add an item to stack.  It increases top by 1
void push(struct Stack* stack, int item)
{
    if (isFull(stack))
        return;
    stack->array[++stack->top] = item;
    printf("%d pushed to stack\n", item);
}

// Function to remove an item from stack.  It decreases top by 1
int pop(struct Stack* stack)
{
    if (isEmpty(stack))
        return INT_MIN;
    return stack->array[stack->top--];
}

我对其进行了更改，以便它存储 int* 而不是 int。

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

struct StackNode
{
  int* data;
  struct StackNode* next;
};

struct StackNode* newNode(int* data)
{
  struct StackNode* stackNode =
    (struct StackNode*) malloc(sizeof(struct StackNode));
  stackNode->data = data;
  stackNode->next = NULL;
  return stackNode;
}

int isEmpty(struct StackNode *root)
{
  return !root;
}

void push(struct StackNode** root, int* data)
{
  struct StackNode* stackNode = newNode(data);
  stackNode->next = *root;
  *root = stackNode;
  printf("%d pushed to stack\n", data);
}

int* pop(struct StackNode** root)
{
  if (isEmpty(*root))
    return INT_MIN;
  struct StackNode* temp = *root;
  *root = (*root)->next;
  int* popped = temp->data;
  free(temp);
  return popped;
}

但很明显，因为线路的原因，它不起作用 return INT_MIN;

如何更改此行以使其正常工作？