user: 这段汇编代码用C语言表示是什么样的:

```asm
<find_legacy_mouse>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %edi,-0x44(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    -0x34(%rbp),%rdx
  mov    -0x44(%rbp),%eax
  mov    %rdx,%rsi
  mov    %eax,%edi
  call   <tcgetattr@plt>
  mov    %eax,-0x2c(%rbp)
  cmpl   $0x0,-0x2c(%rbp)
  jns    L26
  mov    $0x1,%eax
  jmp    L3
L26:
  lea    -0x34(%rbp),%rdx
  mov    -0x44(%rbp),%eax
  mov    $0x7,%esi
  mov    %eax,%edi
  call   <setup_serial_port@plt>
  mov    %eax,-0x2c(%rbp)
  cmpl   $0x0,-0x2c(%rbp)
  jns    L82
  mov    $0x1,%eax
  jmp    L3
L82:
  mov    -0x44(%rbp),%eax
  mov    %eax,%edi
  call   <get_serial_lines@plt>
  mov    %eax,-0x28(%rbp)
  mov    D30(%rip),%rax
  mov    (%rax),%edx
  mov    D2(%rip),%rax
  mov    (%rax),%eax
  or     %edx,%eax
  not    %eax
  and    %eax,-0x28(%rbp)
  mov    -0x28(%rbp),%edx
  mov    -0x44(%rbp),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <set_serial_lines@plt>
  mov    $0x30d40,%edi
  call   <usleep@plt>
  mov    D2(%rip),%rax
  mov    (%rax),%edx
  mov    D30(%rip),%rax
  mov    (%rax),%eax
  or     %edx,%eax
  or     %eax,-0x28(%rbp)
  mov    -0x28(%rbp),%edx
  mov    -0x44(%rbp),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <set_serial_lines@plt>
  movl   $0x0,-0x30(%rbp)
  mov    $0x0,%edi
  call   <time@plt>
  mov    %eax,-0x24(%rbp)
  jmp    L61
L142:
  movq   $0x0,-0x18(%rbp)
  movl   $0x3d090,-0x20(%rbp)
  lea    -0x20(%rbp),%rdx
  mov    -0x44(%rbp),%eax
  mov    %rdx,%rsi
  mov    %eax,%edi
  call   <wait_for_input@plt>
  test   %rax,%rax
  jle    L147
  lea    -0xa(%rbp),%rcx
  mov    -0x44(%rbp),%eax
  mov    $0x1,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <read@plt>
  mov    %eax,-0x2c(%rbp)
  cmpl   $0x0,-0x2c(%rbp)
  jns    L65
  mov    D41(%rip),%rax
  mov    (%rax),%rdx
  mov    D4(%rip),%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  je     L34
  mov    $0x1,%eax
  jmp    L3
L65:
  movl   $0x1,-0x30(%rbp)
  jmp    L34
L147:
  movl   $0x1,-0x30(%rbp)
L34:
  mov    $0x0,%edi
  call   <time@plt>
  sub    -0x24(%rbp),%eax
  cmp    $0x2,%eax
  jle    L61
  movl   $0x1,-0x30(%rbp)
L61:
  cmpl   $0x0,-0x30(%rbp)
  je     L142
  movzbl -0xa(%rbp),%eax
  cmp    $0x4d,%al
  jne    L140
  mov    $0x3,%eax
  jmp    L3
L140:
  mov    $0x2,%eax
L3:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L60
  call   <__stack_chk_fail@plt>
L60:
  leave
  ret
```

assistant: ```c
int find_legacy_mouse(int fd) {
  int modem_lines;
  int temp;
  int done;
  int starttime;
  unsigned char resp[2];
  struct timeval timo;
  struct termios portattr;
  ;
  ;
  temp = tcgetattr(fd, &portattr);
  if (temp < 0)
    return 1;
  temp = setup_serial_port(fd, 7, &portattr);
  if (temp < 0)
    return 1;
  modem_lines = get_serial_lines(fd);
  modem_lines &= ~(TIOCM_RTS | TIOCM_DTR);
  set_serial_lines(fd, modem_lines);
  usleep(200000);
  modem_lines |= TIOCM_DTR | TIOCM_RTS;
  set_serial_lines(fd, modem_lines);
  done = 0;
  starttime = time(NULL);
  while (!done) {
    timo.tv_sec = 0;
    timo.tv_usec = 250000;
    if (wait_for_input(fd, &timo) > 0) {
      temp = read(fd, resp, 1);
      if (temp < 0) {
        if (errno != EAGAIN)
          return 1;
      } else {
        done = 1;
      }
    } else
      done = 1;
    if (time(NULL) - starttime > 2)
      done = 1;
  }
  if (*resp == 'M') {
    ;
    ;
    return 3;
  } else
    return 2;
}
```