user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<getop>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%rbp
L142:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,%ebx
  mov    %al,0x0(%rbp)
  cmp    $0x9,%eax
  je     L142
  cmp    $0x20,%al
  je     L142
  movb   $0x0,0x1(%rbp)
  cmp    $0x2d,%eax
  jne    L153
  movb   $0x2d,0x0(%rbp)
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,%ebx
  mov    $0x1,%r13d
  jmp    L266
L153:
  movsbl %al,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L204
  cmp    $0x64,%ebx
  je     L146
  jle    L299
  cmp    $0x65,%ebx
  je     L159
  cmp    $0x73,%ebx
  jne    L95
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %al,0x1(%rbp)
  cmp    $0x69,%al
  je     L213
  cmp    $0x77,%eax
  mov    $0x5f,%ebx
  cmove  %eax,%ebx
  jmp    L95
L299:
  cmp    $0x2e,%ebx
  je     L59
  cmp    $0x63,%ebx
  jne    L95
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %al,0x1(%rbp)
  cmp    $0x6c,%al
  mov    $0x5f,%eax
  cmovne %eax,%ebx
  jmp    L95
L213:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %al,0x2(%rbp)
  cmp    $0x6e,%al
  mov    $0x5f,%eax
  cmovne %eax,%ebx
  jmp    L95
L146:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %al,0x1(%rbp)
  cmp    $0x70,%al
  mov    $0x5f,%eax
  cmovne %eax,%ebx
  jmp    L95
L159:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %al,0x1(%rbp)
  cmp    $0x78,%al
  je     L211
  mov    $0x5f,%ebx
  jmp    L95
L211:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %al,0x2(%rbp)
  cmp    $0x70,%al
  mov    $0x5f,%eax
  cmovne %eax,%ebx
  jmp    L95
L204:
  mov    $0x0,%r13d
L266:
  movsbl %bl,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  je     L113
  movslq %r13d,%rax
  cmpb   $0x2d,-0x1(%rbp,%rax,1)
  je     L141
L253:
  lea    0x1(%r13),%r12d
  movslq %r12d,%r12
L27:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,%ebx
  mov    %r12d,%r13d
  mov    %al,0x0(%rbp,%r12,1)
  movsbl %al,%edi
  call   <isdigit@plt>
  add    $0x1,%r12
  test   %rax,%rax
  jne    L27
L113:
  cmp    $0x2e,%ebx
  je     L25
L268:
  movslq %r13d,%r13
  movb   $0x0,0x0(%rbp,%r13,1)
  mov    D6(%rip),%rax
  cmp    %ebx,(%rax)
  jne    L192
L110:
  mov    $0x30,%ebx
  cmpb   $0x2d,0x0(%rbp)
  je     L69
L95:
  mov    %ebx,%eax
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L59:
  mov    $0x0,%r13d
  jmp    L266
L141:
  mov    %bl,0x0(%rbp,%rax,1)
  jmp    L253
L25:
  lea    0x1(%r13),%r12d
  movslq %r12d,%r12
L163:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,%ebx
  mov    %r12d,%r13d
  mov    %al,0x0(%rbp,%r12,1)
  movsbl %al,%edi
  call   <isdigit@plt>
  add    $0x1,%r12
  test   %rax,%rax
  jne    L163
  jmp    L268
L192:
  mov    %ebx,%edi
  call   <ungetch@plt>
  jmp    L110
L69:
  cmpb   $0x1,0x1(%rbp)
  sbb    %ebx,%ebx
  and    $0xfffffffd,%ebx
  add    $0x30,%ebx
  jmp    L95
```

assistant: ```c
int getop(char s[]) {
  int i, c;
  while ((s[0] = c = getch()) == ' ' || c == '\t')
    ;
  s[1] = 0;
  if (c != '-' && !isdigit(c) && c != '.') {
    if (c == 's') {
      if ((s[1] = c = getch()) == 'i') {
        if ((s[2] = c = getch()) == 'n')
          return 's';
        else
          return '_';
      } else if (c == 'w')
        return 'w';
      else
        return '_';
    } else if (c == 'd') {
      if ((s[1] = c = getch()) == 'p')
        return 'd';
      else
        return '_';
    } else if (c == 'c') {
      if ((s[1] = c = getch()) == 'l')
        return 'c';
      else
        return '_';
    } else if (c == 'e') {
      if ((s[1] = c = getch()) == 'x') {
        if ((s[2] = c = getch()) == 'p')
          return 'e';
        else
          return '_';
      } else
        return '_';
    } else
      return c;
  }
  i = 0;
  if (c == '-') {
    s[i++] = c;
    c = getch();
  }
  if (isdigit(c)) {
    if (s[i - 1] == '-')
      s[i] = c;
    while (isdigit(s[++i] = c = getch()))
      ;
  }
  if (c == '.') {
    while (isdigit(s[++i] = c = getch()))
      ;
  }
  s[i] = '\0';
  if (c != EOF)
    ungetch(c);
  if (s[0] == '-' && s[1] == '\0')
    return s[0];
  return '0';
}
```