user: 这段汇编代码用C语言表示是什么样的?

```asm
<getop>:
  endbr64
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  nop
L170:
  xor    %eax,%eax
  call   <getch@plt>
  mov    %al,0x0(%rbp)
  mov    %eax,%r12d
  cmp    $0x9,%al
  je     L170
  cmp    $0x20,%al
  je     L170
  movb   $0x0,0x1(%rbp)
  movsbl %al,%r13d
  mov    %r13d,%edi
  call   <isalpha@plt>
  test   %rax,%rax
  je     L135
  lea    0x1(%rbp),%rbx
  xchg   %ax,%ax
L100:
  xor    %eax,%eax
  mov    %rbx,%r14
  add    $0x1,%rbx
  call   <getch@plt>
  movsbl %al,%r13d
  mov    %r13b,-0x1(%rbx)
  mov    %r13d,%edi
  call   <isalpha@plt>
  test   %rax,%rax
  jne    L100
  mov    D17(%rip),%rax
  movb   $0x0,(%r14)
  cmp    %r13b,(%rax)
  jne    L62
L173:
  mov    %rbp,%rdi
  mov    $0x6e,%r12d
  call   <strlen@plt>
  cmp    $0x1,%eax
  jg     L167
  movzbl 0x0(%rbp),%r12d
L167:
  pop    %rbx
  mov    %r12d,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
  nopw   0x0(%rax,%rax,1)
L62:
  mov    %r13d,%edi
  call   <ungetch@plt>
  jmp    L173
  nopw   0x0(%rax,%rax,1)
L135:
  mov    %r13d,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L51
  lea    -0x2d(%r12),%eax
  cmp    $0x1,%al
  ja     L167
L51:
  xor    %ebx,%ebx
  cmp    $0x2d,%r12b
  je     L154
L122:
  mov    %r13d,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  je     L66
  nopl   0x0(%rax,%rax,1)
L110:
  xor    %eax,%eax
  add    $0x1,%rbx
  call   <getch@plt>
  movsbl %al,%edi
  mov    %dil,0x0(%rbp,%rbx,1)
  mov    %edi,%r12d
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L110
L66:
  lea    0x0(%rbp,%rbx,1),%r13
  cmp    $0x2e,%r12b
  je     L153
L95:
  mov    D17(%rip),%rax
  movb   $0x0,0x0(%r13)
  cmp    %r12b,(%rax)
  jne    L126
  mov    $0x30,%r12d
  pop    %rbx
  pop    %rbp
  mov    %r12d,%eax
  pop    %r12
  pop    %r13
  pop    %r14
  ret
L126:
  movsbl %r12b,%edi
  mov    $0x30,%r12d
  call   <ungetch@plt>
  pop    %rbx
  mov    %r12d,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
L154:
  xor    %eax,%eax
  call   <getch@plt>
  movsbl %al,%r13d
  mov    %r13d,%edi
  mov    %r13d,%ebx
  call   <isdigit@plt>
  cmp    $0x2e,%r13b
  je     L99
  test   %rax,%rax
  je     L108
L99:
  mov    %bl,0x1(%rbp)
  mov    %ebx,%r12d
  mov    $0x1,%ebx
  jmp    L122
L153:
  lea    0x1(%rbp,%rbx,1),%rbx
  nop
L61:
  xor    %eax,%eax
  mov    %rbx,%r13
  add    $0x1,%rbx
  call   <getch@plt>
  movsbl %al,%edi
  mov    %dil,-0x1(%rbx)
  mov    %edi,%r12d
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L61
  jmp    L95
L108:
  mov    D17(%rip),%rax
  cmp    %r13b,(%rax)
  je     L167
  mov    %r13d,%edi
  call   <ungetch@plt>
  jmp    L167
```

assistant: ```c
char getop(char s[]) {
  size_t i;
  char c;
  while ((s[0] = c = getch()) == ' ' || c == '\t')
    ;
  s[1] = '\0';
  i = 0;
  if (isalpha(c)) {
    while (isalpha(s[++i] = c = getch()))
      ;
    s[i] = '\0';
    if (c != EOF)
      ungetch(c);
    if (strlen(s) > 1)
      return 'n';
    else
      return s[0];
  }
  if (!isdigit(c) && c != '.' && c != '-')
    return c;
  if (c == '-') {
    if (isdigit(c = getch()) || c == '.')
      s[++i] = c;
    else {
      if (c != (char)EOF)
        ungetch(c);
      return '-';
    }
  }
  if (isdigit(c))
    while (isdigit(s[++i] = c = getch()))
      ;
  if (c == '.')
    while (isdigit(s[++i] = c = getch()))
      ;
  s[i] = '\0';
  if (c != (char)EOF)
    ungetch(c);
  return '0';
}
```