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#include "stack.h"
#include <stdlib.h>
#include <stdio.h>

void stack_init(stack_s *stack) {
  *stack = malloc(sizeof(stack_node_s));
  (*stack)->next = NULL;
  (*stack)->value = NULL;
}

int stack_push(void *p, stack_s *stack) {
  stack_s first = malloc(sizeof(stack_node_s));

  if (first == NULL) {
    return -1;
  } else {
    first->value = p;
    first->next = *stack;
    *stack = first;
    return 1;
  }
}

void *stack_pop(stack_s *stack) {
  if (*stack != NULL) {
    void *temp = malloc(sizeof(void));
    *temp = (*stack)->value;
    *stack = (*stack)->next;
    return *temp;
  } else {
    return NULL;
  }
}