user: 请将以下的汇编代码转换成C语言代码：

```asm
<threestacks>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %edi,-0x4(%rbp)
  mov    %esi,-0x8(%rbp)
  mov    %rdx,-0x10(%rbp)
  mov    %ecx,-0x14(%rbp)
  mov    %r8d,-0x18(%rbp)
  mov    %r9d,-0x1c(%rbp)
  mov    -0x1c(%rbp),%eax
  cmp    -0x8(%rbp),%eax
  jne    L30
  mov    -0x1c(%rbp),%eax
  cltq
  shl    $0x2,%rax
  lea    -0x4(%rax),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x1c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x10(%rbp),%rax
  add    %rcx,%rax
  add    $0x1,%edx
  mov    %edx,(%rax)
  jmp    L16
L44:
  mov    -0x1c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x18(%rbp),%eax
  add    %edx,%eax
  cmp    %eax,-0x4(%rbp)
  jne    L48
  mov    D9(%rip),%eax
  add    $0x1,%eax
  mov    %eax,D16(%rip)
  cmpl   $0x0,-0x14(%rbp)
  je     L48
  mov    -0x10(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    -0x8(%rbp),%eax
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <prtiarray@plt>
L48:
  mov    -0x1c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  add    $0x1,%edx
  mov    %edx,(%rax)
L16:
  mov    -0x1c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  cmp    %eax,-0x4(%rbp)
  jge    L44
  jmp    L32
L30:
  cmpl   $0x0,-0x1c(%rbp)
  jle    L32
  mov    -0x1c(%rbp),%eax
  cltq
  shl    $0x2,%rax
  lea    -0x4(%rax),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x1c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x10(%rbp),%rax
  add    %rcx,%rax
  add    $0x1,%edx
  mov    %edx,(%rax)
  jmp    L12
L13:
  mov    -0x1c(%rbp),%eax
  lea    0x1(%rax),%r8d
  mov    -0x1c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x18(%rbp),%eax
  lea    (%rdx,%rax,1),%edi
  mov    -0x14(%rbp),%ecx
  mov    -0x10(%rbp),%rdx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <threestacks>
  mov    -0x1c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  add    $0x1,%edx
  mov    %edx,(%rax)
L12:
  mov    -0x1c(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x8(%rbp),%eax
  sub    -0x1c(%rbp),%eax
  lea    0x1(%rax),%esi
  mov    -0x4(%rbp),%eax
  cltd
  idiv   %esi
  cmp    %eax,%ecx
  jle    L13
L32:
  mov    D16(%rip),%eax
  leave
  ret
```

assistant: ```c
int threestacks(int nballs, int nboxes, int box[], int verbose, int prevsum, int lv) {
  static int i = 0;
  if (lv == nboxes) {
    for (box[lv] = box[lv - 1] + 1; box[lv] <= nballs; ++(box[lv])) {
      if ((prevsum + box[lv]) == nballs) {
        i++;
        if (verbose)
          prtiarray(box + 1, nboxes);
      }
    }
  } else if (lv >= 1) {
    for (box[lv] = box[lv - 1] + 1; box[lv] <= (nballs / (nboxes - lv + 1)); box[lv]++) {
      threestacks(nballs, nboxes, box, verbose, prevsum + box[lv], lv + 1);
    }
  }
  return i;
}
```