user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<getop>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  movl   $0x0,-0xc(%rbp)
  nop
L166:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x8(%rbp)
  mov    -0x8(%rbp),%eax
  mov    %eax,%edx
  mov    -0x18(%rbp),%rax
  mov    %dl,(%rax)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  je     L166
  cmpl   $0x9,-0x8(%rbp)
  je     L166
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  movb   $0x0,(%rax)
  mov    -0x8(%rbp),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isalpha@plt>
  test   %rax,%rax
  je     L111
  nop
L147:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x8(%rbp)
  addl   $0x1,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x8(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isalpha@plt>
  test   %rax,%rax
  jne    L147
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  mov    D18(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x8(%rbp)
  je     L189
  mov    -0x8(%rbp),%eax
  mov    %eax,%edi
  call   <ungetch@plt>
L189:
  mov    $0x31,%eax
  jmp    L23
L111:
  mov    -0x8(%rbp),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L102
  cmpl   $0x2e,-0x8(%rbp)
  je     L102
  cmpl   $0x2d,-0x8(%rbp)
  je     L102
  mov    -0x8(%rbp),%eax
  jmp    L23
L102:
  cmpl   $0x2d,-0x8(%rbp)
  jne    L52
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x4(%rbp),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L169
  cmpl   $0x2e,-0x4(%rbp)
  je     L169
  mov    -0x8(%rbp),%eax
  jmp    L23
L169:
  mov    -0x4(%rbp),%eax
  mov    %eax,-0x8(%rbp)
  jmp    L164
L52:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x8(%rbp)
  jmp    L164
L127:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x8(%rbp)
L164:
  addl   $0x1,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x8(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L127
  cmpl   $0x2e,-0x8(%rbp)
  jne    L57
  nop
L92:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x8(%rbp)
  addl   $0x1,-0xc(%rbp)
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x8(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L92
L57:
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  mov    D18(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x8(%rbp)
  je     L41
  mov    -0x8(%rbp),%eax
  mov    %eax,%edi
  call   <ungetch@plt>
L41:
  mov    $0x30,%eax
L23:
  leave
  ret
```

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