static int *stack_mem = NULL;
static unsigned int stack_pointer = 0;
int* stack_push(int data)
{
stack_mem=(int* )realloc(stack_mem, (stack_pointer+1)*sizeof(int));
if(stack_mem==NULL) return NULL; //out of mem
stack_mem[stack_pointer++] = data;
return (stack_mem + stack_pointer - 1);
}
int* stack_pop(int* data)
{
if(stack_pointer)
{
*data = stack_mem[--stack_pointer];
return (stack_mem + stack_pointer);
}
return NULL; //no data in stack
}