user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<__dns_parse>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %rcx,-0x40(%rbp)
  cmpl   $0xb,-0x2c(%rbp)
  jg     L116
  mov    $0xffffffff,%eax
  jmp    L43
L116:
  mov    -0x28(%rbp),%rax
  add    $0x3,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  and    $0xf,%eax
  test   %eax,%eax
  je     L44
  mov    $0x0,%eax
  jmp    L43
L44:
  mov    -0x28(%rbp),%rax
  add    $0xc,%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x28(%rbp),%rax
  add    $0x4,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x8,%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    $0x5,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %edx,%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x28(%rbp),%rax
  add    $0x6,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x8,%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    $0x7,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %edx,%eax
  mov    %eax,-0x10(%rbp)
  mov    -0x14(%rbp),%edx
  mov    -0x10(%rbp),%eax
  add    %edx,%eax
  cmp    $0x40,%eax
  jle    L188
  mov    $0xffffffff,%eax
  jmp    L43
L25:
  addq   $0x1,-0x8(%rbp)
L12:
  mov    -0x8(%rbp),%rax
  sub    -0x28(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x2c(%rbp),%eax
  cltq
  cmp    %rax,%rdx
  jge    L57
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  sub    $0x1,%eax
  cmp    $0x7e,%eax
  jbe    L25
L57:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0xc1,%al
  ja     L16
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0xc1,%al
  jne    L257
  mov    -0x8(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  cmp    $0xff,%al
  je     L16
L257:
  mov    -0x2c(%rbp),%eax
  cltq
  lea    -0x6(%rax),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  cmp    %rax,-0x8(%rbp)
  jbe    L53
L16:
  mov    $0xffffffff,%eax
  jmp    L43
L53:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L41
  mov    $0x6,%eax
  jmp    L0
L41:
  mov    $0x5,%eax
L0:
  add    %rax,-0x8(%rbp)
L188:
  mov    -0x14(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x14(%rbp)
  test   %eax,%eax
  jne    L12
  jmp    L101
L202:
  addq   $0x1,-0x8(%rbp)
L189:
  mov    -0x8(%rbp),%rax
  sub    -0x28(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x2c(%rbp),%eax
  cltq
  cmp    %rax,%rdx
  jge    L176
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  sub    $0x1,%eax
  cmp    $0x7e,%eax
  jbe    L202
L176:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0xc1,%al
  ja     L305
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0xc1,%al
  jne    L17
  mov    -0x8(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  cmp    $0xff,%al
  je     L305
L17:
  mov    -0x2c(%rbp),%eax
  cltq
  lea    -0x6(%rax),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  cmp    %rax,-0x8(%rbp)
  jbe    L47
L305:
  mov    $0xffffffff,%eax
  jmp    L43
L47:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L293
  mov    $0x2,%eax
  jmp    L66
L293:
  mov    $0x1,%eax
L66:
  add    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  add    $0x8,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x8,%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%rax
  add    $0x9,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %edx,%eax
  mov    %eax,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rax,%rdx
  mov    -0x2c(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  cmp    %rax,%rdx
  jbe    L83
  mov    $0xffffffff,%eax
  jmp    L43
L83:
  mov    -0x8(%rbp),%rax
  lea    0xa(%rax),%rdi
  mov    -0x8(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  movzbl %al,%esi
  mov    -0x28(%rbp),%rcx
  mov    -0xc(%rbp),%edx
  mov    -0x40(%rbp),%rax
  mov    -0x38(%rbp),%r9
  mov    %rcx,%r8
  mov    %edx,%ecx
  mov    %rdi,%rdx
  mov    %rax,%rdi
  call   *%r9
  test   %eax,%eax
  jns    L264
  mov    $0xffffffff,%eax
  jmp    L43
L264:
  mov    -0xc(%rbp),%eax
  add    $0xa,%eax
  cltq
  add    %rax,-0x8(%rbp)
L101:
  mov    -0x10(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x10(%rbp)
  test   %eax,%eax
  jne    L189
  mov    $0x0,%eax
L43:
  leave
  ret
```

assistant: ```c
int __dns_parse(const unsigned char *r, int rlen, int (*callback)(void *, int, const void *, int, const void *), void *ctx) {
  int qdcount, ancount;
  const unsigned char *p;
  int len;
  if (rlen < 12)
    return -1;
  if ((r[3] & 15))
    return 0;
  p = r + 12;
  qdcount = r[4] * 256 + r[5];
  ancount = r[6] * 256 + r[7];
  if (qdcount + ancount > 64)
    return -1;
  while (qdcount--) {
    while (p - r < rlen && *p - 1U < 127)
      p++;
    if (*p > 193 || (*p == 193 && p[1] > 254) || p > r + rlen - 6)
      return -1;
    p += 5 + !!*p;
  }
  while (ancount--) {
    while (p - r < rlen && *p - 1U < 127)
      p++;
    if (*p > 193 || (*p == 193 && p[1] > 254) || p > r + rlen - 6)
      return -1;
    p += 1 + !!*p;
    len = p[8] * 256 + p[9];
    if (p + len > r + rlen)
      return -1;
    if (callback(ctx, p[1], p + 10, len, r) < 0)
      return -1;
    p += 10 + len;
  }
  return 0;
}
```