user: 这段汇编代码用C语言表示是什么样的？

```asm
<punycode_decode>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,%r14
  mov    %rsi,0x10(%rsp)
  mov    %rdx,0x20(%rsp)
  mov    %rcx,(%rsp)
  test   %rsi,%rsi
  je     L225
  mov    %rdi,%rax
  lea    (%rdi,%rsi,1),%rdx
L259:
  cmpb   $0x0,(%rax)
  js     L179
  add    $0x1,%rax
  cmp    %rdx,%rax
  jne    L259
L225:
  mov    0x10(%rsp),%rax
  lea    -0x1(%r14,%rax,1),%rbx
  cmp    %rbx,%r14
  jae    L216
L218:
  cmpb   $0x2d,(%rbx)
  je     L216
  sub    $0x1,%rbx
  cmp    %rbx,%r14
  jne    L218
  mov    $0x0,%r15d
  mov    $0x0,%ebx
  jmp    L94
L216:
  sub    %r14,%rbx
  mov    (%rsp),%rax
  mov    (%rax),%r15
  cmp    %r15,%rbx
  cmovbe %rbx,%r15
  test   %r15,%r15
  je     L94
  mov    $0x0,%eax
  mov    0x20(%rsp),%rcx
L207:
  movzbl (%r14,%rax,1),%edx
  mov    %dl,(%rcx,%rax,1)
  add    $0x1,%rax
  cmp    %rax,%r15
  jne    L207
L94:
  cmp    $0x1,%rbx
  sbb    $0xffffffffffffffff,%rbx
  cmp    %rbx,0x10(%rsp)
  jbe    L203
  mov    $0x48,%eax
  movq   $0x0,0x18(%rsp)
  movq   $0x80,0x28(%rsp)
  mov    %r14,0x8(%rsp)
  mov    %rax,%r14
L100:
  mov    (%rsp),%rax
  cmp    %r15,(%rax)
  jbe    L203
  mov    0x18(%rsp),%r13
  mov    $0x1,%ebp
  mov    $0x24,%r12d
  jmp    L143
L242:
  mov    $0x0,%edi
  call   <assert@plt>
  jmp    L203
L91:
  cmp    %rcx,%rax
  ja     L98
  mov    $0x24,%ecx
  sub    %rax,%rcx
  mov    %rsi,%rax
  mov    $0x0,%edx
  div    %rcx
  cmp    %rbp,%rax
  jb     L86
  imul   %rcx,%rbp
  add    $0x24,%r12
  mov    (%rsp),%rax
  cmp    %r15,(%rax)
  jbe    L98
L143:
  add    $0x1,%rbx
  mov    0x8(%rsp),%rax
  movsbl -0x1(%rax,%rbx,1),%edi
  call   <decode_digit@plt>
  mov    %rax,%rcx
  mov    D6(%rip),%rax
  mov    (%rax),%rsi
  cmp    %rcx,%rsi
  je     L203
  mov    %rsi,%rax
  sub    %r13,%rax
  mov    $0x0,%edx
  div    %rbp
  cmp    %rcx,%rax
  jb     L242
  mov    %rcx,%rax
  imul   %rbp,%rax
  add    %rax,%r13
  mov    $0x1,%eax
  cmp    %r14,%r12
  jbe    L91
  lea    0x1a(%r14),%rdx
  mov    %r12,%rax
  sub    %r14,%rax
  cmp    %r12,%rdx
  mov    $0x1a,%edx
  cmovbe %rdx,%rax
  jmp    L91
L86:
  mov    $0x0,%edi
  call   <assert@plt>
  jmp    L203
L98:
  lea    0x1(%r15),%rbp
  mov    0x18(%rsp),%rax
  test   %rax,%rax
  sete   %dl
  movzbl %dl,%edx
  mov    %r13,%rdi
  sub    %rax,%rdi
  mov    %rbp,%rsi
  call   <adapt_bias@plt>
  mov    %rax,%r14
  mov    %r13,%rax
  mov    $0x0,%edx
  div    %rbp
  mov    D6(%rip),%rdx
  mov    (%rdx),%rdx
  sub    0x28(%rsp),%rdx
  cmp    %rdx,%rax
  ja     L234
  add    %rax,0x28(%rsp)
  mov    %r13,%rax
  mov    $0x0,%edx
  div    %rbp
  mov    0x20(%rsp),%rax
  lea    (%rax,%rdx,1),%r12
  lea    0x1(%rdx),%rsi
  mov    %rsi,0x18(%rsp)
  sub    %rdx,%r15
  add    %rsi,%rax
  mov    %rax,%rdi
  mov    %r15,%rdx
  mov    %r12,%rsi
  call   <memmove@plt>
  movzbl 0x28(%rsp),%eax
  mov    %al,(%r12)
  cmp    %rbx,0x10(%rsp)
  jbe    L74
  mov    %rbp,%r15
  jmp    L100
L234:
  mov    $0x0,%edi
  call   <assert@plt>
  jmp    L203
L74:
  mov    %rbp,%r15
  jmp    L203
L179:
  mov    $0x0,%r15d
  mov    $0x0,%ebx
L203:
  mov    (%rsp),%rax
  mov    %r15,(%rax)
  mov    %rbx,%rax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
size_t punycode_decode(const char *const src, const size_t srclen, uint32_t *const dst, size_t *const dstlen) {
  const char *p;
  size_t b, n, t;
  size_t i, k, w;
  size_t si, di;
  size_t digit;
  size_t org_i;
  size_t bias;
  for (si = 0; si < srclen; si++) {
    if (src[si] & 0x80) {
      *dstlen = 0;
      return 0;
    }
  }
  for (p = src + srclen - 1; p > src && *p != '-'; p--)
    ;
  b = p - src;
  di = ((b) < (*dstlen) ? (b) : (*dstlen));
  for (i = 0; i < di; i++) {
    dst[i] = src[i];
  }
  i = 0;
  n = 128;
  bias = 72;
  for (si = b + (b > 0); si < srclen && di < *dstlen; di++) {
    org_i = i;
    for (w = 1, k = 36; di < *dstlen; k += 36) {
      digit = decode_digit(src[si++]);
      if (digit == SIZE_MAX) {
        goto fail;
      }
      if (digit > (SIZE_MAX - i) / w) {
        assert(0 && "OVERFLOW");
        goto fail;
      }
      i += digit * w;
      if (k <= bias) {
        t = 1;
      } else if (k >= bias + 26) {
        t = 26;
      } else {
        t = k - bias;
      }
      if (digit < t) {
        break;
      }
      if (w > SIZE_MAX / (36 - t)) {
        assert(0 && "OVERFLOW");
        goto fail;
      }
      w *= 36 - t;
    }
    bias = adapt_bias(i - org_i, di + 1, org_i == 0);
    if (i / (di + 1) > SIZE_MAX - n) {
      assert(0 && "OVERFLOW");
      goto fail;
    }
    n += i / (di + 1);
    i %= (di + 1);
    memmove(dst + i + 1, dst + i, (di - i) * sizeof(uint32_t));
    dst[i++] = n;
  }
fail:
  *dstlen = di;
  return si;
}
```