user: What would the C source look like for the assembly code provided here:

```asm
<dns_format>:
  endbr64
  push   %r14
  xor    %r14d,%r14d
  push   %r13
  push   %r12
  mov    %rdi,%r12
  push   %rbp
  mov    %rsi,%rbp
  lea    D9(%rip),%rsi
  push   %rbx
  mov    %rbp,%rdi
  xor    %ebx,%ebx
  call   <strcat@plt>
  jmp    L171
  nopl   0x0(%rax,%rax,1)
L111:
  add    $0x1,%rbx
L171:
  mov    %rbp,%rdi
  mov    %ebx,%r13d
  call   <strlen@plt>
  mov    %ebx,%ecx
  cmp    %ebx,%eax
  jle    L177
  cmpb   $0x2e,0x0(%rbp,%rbx,1)
  jne    L111
  mov    %ebx,%eax
  lea    0x1(%r12),%r9
  sub    %r14d,%eax
  mov    %al,(%r12)
  cmp    %r13d,%r14d
  jge    L193
  movslq %r14d,%rax
  mov    %r13d,%esi
  mov    %r9,%rdx
  lea    0x1(%rbp,%rax,1),%rdi
  sub    %r14d,%esi
  sub    %rdi,%rdx
  lea    -0x1(%rsi),%r8d
  cmp    $0xe,%rdx
  jbe    L209
  cmp    $0x6,%r8d
  jbe    L209
  cmp    $0xe,%r8d
  jbe    L0
  mov    %esi,%edi
  lea    0x0(%rbp,%rax,1),%rdx
  xor    %eax,%eax
  shr    $0x4,%edi
  shl    $0x4,%rdi
  nopl   (%rax)
L91:
  movdqu (%rdx,%rax,1),%xmm0
  movups %xmm0,0x1(%r12,%rax,1)
  add    $0x10,%rax
  cmp    %rdi,%rax
  jne    L91
  mov    %esi,%r10d
  and    $0xfffffff0,%r10d
  mov    %r10d,%eax
  add    %r10d,%r14d
  lea    (%r9,%rax,1),%rdi
  cmp    %r10d,%esi
  je     L57
  sub    %r10d,%esi
  lea    -0x1(%rsi),%r10d
  cmp    $0x6,%r10d
  jbe    L51
L103:
  mov    (%rdx,%rax,1),%rdx
  mov    %rdx,0x1(%r12,%rax,1)
  mov    %esi,%eax
  and    $0xfffffff8,%eax
  mov    %eax,%edx
  add    %eax,%r14d
  add    %rdx,%rdi
  cmp    %eax,%esi
  je     L57
L51:
  movslq %r14d,%rax
  movzbl 0x0(%rbp,%rax,1),%eax
  mov    %al,(%rdi)
  lea    0x1(%r14),%eax
  cmp    %ecx,%eax
  jge    L57
  cltq
  movzbl 0x0(%rbp,%rax,1),%eax
  mov    %al,0x1(%rdi)
  lea    0x2(%r14),%eax
  cmp    %ecx,%eax
  jge    L57
  cltq
  movzbl 0x0(%rbp,%rax,1),%eax
  mov    %al,0x2(%rdi)
  lea    0x3(%r14),%eax
  cmp    %eax,%ecx
  jle    L57
  cltq
  movzbl 0x0(%rbp,%rax,1),%eax
  mov    %al,0x3(%rdi)
  lea    0x4(%r14),%eax
  cmp    %eax,%ecx
  jle    L57
  cltq
  movzbl 0x0(%rbp,%rax,1),%eax
  mov    %al,0x4(%rdi)
  lea    0x5(%r14),%eax
  cmp    %eax,%ecx
  jle    L57
  cltq
  add    $0x6,%r14d
  movzbl 0x0(%rbp,%rax,1),%eax
  mov    %al,0x5(%rdi)
  cmp    %r14d,%ecx
  jle    L57
  movslq %r14d,%r14
  movzbl 0x0(%rbp,%r14,1),%eax
  mov    %al,0x6(%rdi)
L57:
  lea    0x1(%r9,%r8,1),%r12
L70:
  lea    0x1(%r13),%r14d
  jmp    L111
  nopl   0x0(%rax)
L177:
  movb   $0x0,(%r12)
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
  xchg   %ax,%ax
L209:
  sub    %rax,%r12
  nopl   0x0(%rax,%rax,1)
L74:
  movzbl 0x0(%rbp,%rax,1),%edx
  mov    %dl,0x1(%r12,%rax,1)
  add    $0x1,%rax
  cmp    %eax,%ecx
  jg     L74
  jmp    L57
  nopl   0x0(%rax)
L193:
  mov    %r14d,%r13d
  mov    %r9,%r12
  jmp    L70
L0:
  lea    0x0(%rbp,%rax,1),%rdx
  mov    %r9,%rdi
  xor    %eax,%eax
  jmp    L103
```

tool_calls: name: disassemble_data
arguments: data_tag: D9
type_guessed: string

tool: D9: .

assistant: ```c
void dns_format(unsigned char *dns, unsigned char *host) {
  int lock = 0, i;
  strcat((char *)host, ".");
  for (i = 0; i < strlen((char *)host); i++) {
    if (host[i] == '.') {
      *dns++ = i - lock;
      for (; lock < i; lock++) {
        *dns++ = host[lock];
      }
      lock++;
    }
  }
  *dns++ = 0x00;
}
```