user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<read_string>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x10(%rbp)
  mov    -0x10(%rbp),%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
L114:
  lea    -0x11(%rbp),%rax
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <sio_read@plt>
  mov    %eax,-0xc(%rbp)
  cmpl   $0x0,-0xc(%rbp)
  je     L166
  movzbl -0x11(%rbp),%eax
  cmp    $0xd,%al
  je     L52
  movzbl -0x11(%rbp),%eax
  cmp    $0x2,%al
  jne    L92
  cmpl   $0x0,-0x10(%rbp)
  je     L92
  movb   $0x8,-0x11(%rbp)
  lea    -0x11(%rbp),%rax
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <sio_write@plt>
  subl   $0x1,-0x10(%rbp)
  mov    -0x10(%rbp),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <flush_line@plt>
  lea    -0x11(%rbp),%rax
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <sio_write@plt>
  jmp    L105
L92:
  movzbl -0x11(%rbp),%eax
  cmp    $0x6,%al
  jne    L80
  mov    -0x10(%rbp),%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L80
  mov    -0x10(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x10(%rbp)
  mov    -0x28(%rbp),%rdx
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <flush_line@plt>
  lea    -0x11(%rbp),%rax
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <sio_write@plt>
  jmp    L105
L80:
  movzbl -0x11(%rbp),%eax
  cmp    $0x8,%al
  jne    L68
  cmpl   $0x0,-0x10(%rbp)
  je     L68
  mov    -0x10(%rbp),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <delete_char@plt>
  movb   $0x8,-0x11(%rbp)
  lea    -0x11(%rbp),%rax
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <sio_write@plt>
  subl   $0x1,-0x10(%rbp)
  mov    -0x10(%rbp),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <flush_line@plt>
  lea    -0x11(%rbp),%rax
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <sio_write@plt>
  jmp    L105
L68:
  movzbl -0x11(%rbp),%eax
  cmp    $0x7f,%al
  jne    L37
  mov    -0x10(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <delete_char@plt>
  mov    -0x10(%rbp),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <flush_line@plt>
  movb   $0x8,-0x11(%rbp)
  lea    -0x11(%rbp),%rax
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <sio_write@plt>
  jmp    L114
L37:
  movzbl -0x11(%rbp),%eax
  cmp    $0x1f,%al
  jbe    L114
  mov    -0x2c(%rbp),%eax
  cmp    %eax,-0x10(%rbp)
  jb     L115
  cmpl   $0xffffffff,-0x2c(%rbp)
  jne    L114
L115:
  movzbl -0x11(%rbp),%eax
  movzbl %al,%edx
  mov    -0x10(%rbp),%ecx
  mov    -0x28(%rbp),%rax
  mov    %ecx,%esi
  mov    %rax,%rdi
  call   <insert_char@plt>
  mov    -0x10(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x10(%rbp)
  mov    -0x28(%rbp),%rdx
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <flush_line@plt>
  jmp    L114
L166:
  nop
L105:
  jmp    L114
L52:
  nop
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L140
  call   <__stack_chk_fail@plt>
L140:
  leave
  ret
```

assistant: ```c
int read_string(char *data, int size) {
  unsigned int n, index;
  unsigned char c;
  index = 0;
  data[index] = 0;
  while (1) {
    n = sio_read(&c, 1);
    if (n < 1)
      continue;
    if (c == '\r') {
      break;
    }
    if (c == 2 && index > 0) {
      c = 8;
      sio_write(&c, 1);
      flush_line(data, --index);
      sio_write(&c, 1);
    } else if (c == 6 && data[index] != 0) {
      flush_line(data, index++);
      sio_write(&c, 1);
    } else if (c == 8 && index > 0) {
      delete_char(data, index);
      c = 8;
      sio_write(&c, 1);
      flush_line(data, --index);
      sio_write(&c, 1);
    } else if (c == 0x7f) {
      delete_char(data, index + 1);
      flush_line(data, index);
      c = 8;
      sio_write(&c, 1);
    } else if (c >= 0x20 && ((index < size) || size == -1)) {
      insert_char(data, index, c);
      flush_line(data, index++);
    }
  }
  n = strlen(data);
  return n;
}
```