int *ptr = f->esp;

  switch (*ptr) {
    case SYS_HALT: {
      halt();
      break;
    }
    case SYS_CREATE: {
      ptr = ptr + 4;
      char nameOfFile = *((char**)(ptr));
      ptr = ptr + 4;
      int sizeOfFile = *((int*))ptr));
      f->eax = create(nameOfFile, sizeOfFile);
      break;
    }
    case SYS_OPEN: {
      ptr = ptr + 4;
      char *nameOfFile1 = *((char**)(ptr));
      f->eax = open(nameOfFile);
      break;
      }
    case SYS_CLOSE: {
      ptr = ptr + 4:
      int fd = *((int*)(ptr));
      close(fd);
      break;
    }
    case SYS_READ: {
      ptr = ptr + 4;
      int readFd = *((int*))ptr));
      ptr = ptr + 4;
      void *readBuffer = *((void**)ptr);
      ptr = ptr + 4;
      int sizeOfBuffer = *((int*)(ptr));
      f->eax = read(readFd, readBuffer, sizeOfBuffer);
      break;
    }
    case SYS_WRITE: {
      ptr = ptr + 4;
      int writeFd = *((int*))ptr));
      ptr = ptr + 4;
      void *writeBuffer = ((void**)ptr);
      ptr = ptr + 4;
      int sizeOfWrBuffer = *(int*)(ptr)
      f->eax = write(writeFd, writeBuffer, sizeOfWrBuffer);
      break;
    }
    case SYS_EXIT: {
      exit(0);
      break;
    }

  }
}

void halt(void) {

  power_off();
}

bool create(const char *file, unsigned intitial_size) {
  return filesys_create(file, intitial_size);
}

int open(const char *file) {

  struct file *newFile = filesys_open(file);
  if(newFile != NULL) {
    for(int i = 2; i < 128; i++) {




    }
  }
}