user: 下面的汇编指令对应的C源代码是什么:

```asm
<re_escape>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x20,%rsp
  mov    %rdi,%rbx
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  mov    %rdi,0x10(%rsp)
  lea    0x1(%rdi),%rcx
  mov    %rcx,0x8(%rsp)
  movsbl (%rdi),%eax
  test   %eax,%eax
  je     L7
  mov    %esi,%r12d
  mov    %rdi,%rdx
  lea    D8(%rip),%rbp
  jmp    L187
  mov    $0xb,%eax
  jmp    L185
  lea    0x8(%rsp),%rdi
  mov    %r12d,%r8d
  mov    $0x8,%ecx
  mov    $0x3,%edx
  mov    $0x1,%esi
  call   <re_byte@plt>
L185:
  mov    0x10(%rsp),%rdx
  lea    0x1(%rdx),%rcx
  mov    %rcx,0x10(%rsp)
  mov    %al,(%rdx)
L71:
  mov    0x8(%rsp),%rdx
  lea    0x1(%rdx),%rcx
  mov    %rcx,0x8(%rsp)
  movsbl (%rdx),%eax
  test   %eax,%eax
  je     L7
L187:
  cmp    $0x5c,%eax
  jne    L185
  lea    0x2(%rdx),%rsi
  mov    %rsi,0x8(%rsp)
  movzbl 0x1(%rdx),%esi
  lea    -0x30(%rsi),%edx
  cmp    $0x48,%dl
  ja     L95
  movzbl %dl,%edx
  movslq 0x0(%rbp,%rdx,4),%rdx
  add    %rbp,%rdx
  notrack jmp *%rdx
  lea    0x8(%rsp),%rdi
  mov    %r12d,%r8d
  mov    $0x10,%ecx
  mov    $0x8,%edx
  mov    $0x8,%esi
  call   <re_byte@plt>
  mov    %eax,%esi
L43:
  lea    0x10(%rsp),%rdi
  call   <re_escape_utf8@plt>
  jmp    L71
  lea    0x8(%rsp),%rdi
  mov    %r12d,%r8d
  mov    $0x10,%ecx
  mov    $0x4,%edx
  mov    $0x4,%esi
  call   <re_byte@plt>
  mov    %eax,%esi
  jmp    L43
  lea    0x8(%rsp),%rdi
  mov    %r12d,%r8d
  mov    $0x10,%ecx
  mov    $0x2,%edx
  mov    $0x1,%esi
  call   <re_byte@plt>
  jmp    L185
L95:
  test   %r12d,%r12d
  je     L143
  movsbl %sil,%eax
  jmp    L185
L143:
  mov    %rcx,0x8(%rsp)
  jmp    L185
  mov    $0x9,%eax
  jmp    L185
  mov    $0xd,%eax
  jmp    L185
  mov    $0xa,%eax
  jmp    L185
  mov    $0xc,%eax
  jmp    L185
  mov    $0x8,%eax
  jmp    L185
  mov    $0x7,%eax
  jmp    L185
L7:
  cmp    %rcx,0x10(%rsp)
  setbe  %dil
  movzbl %dil,%edi
  call   <assert@plt>
  mov    0x10(%rsp),%rax
  movb   $0x0,(%rax)
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L82
  mov    %rbx,%rax
  add    $0x20,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
L82:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
char *re_escape(char *s, int liberal) {
  char *in = s, *out = s;
  int c;
  while ((c = *in++)) {
    int u = 0;
    if ('\\' == c) {
      c = *in++;
      switch (c) {
      case '0':
      case '1':
        c = re_byte(&in, 1, 3, 8, liberal);
        break;
      case '\\':
        c = '\\';
        break;
      case 'a':
        c = '\a';
        break;
      case 'b':
        c = '\b';
        break;
      case 'f':
        c = '\f';
        break;
      case 'n':
        c = '\n';
        break;
      case 'r':
        c = '\r';
        break;
      case 't':
        c = '\t';
        break;
      case 'U':
        c = re_byte(&in, 8, 8, 16, liberal);
        u = 1;
        break;
      case 'u':
        c = re_byte(&in, 4, 4, 16, liberal);
        u = 1;
        break;
      case 'v':
        c = '\v';
        break;
      case 'x':
        c = re_byte(&in, 1, 2, 16, liberal);
        break;
      default: {
        if (!liberal) {
          --in;
          c = '\\';
        }
        break;
      }
      }
    }
    if (u)
      re_escape_utf8(&out, c);
    else
      *out++ = c;
  }
  assert(out <= in);
  *out = 0;
  return s;
}
```