user: What would the C source look like for the assembly code provided here:

```asm
<getop>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  nop
L104:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x4(%rbp),%eax
  mov    %eax,%edx
  mov    -0x18(%rbp),%rax
  mov    %dl,(%rax)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  je     L104
  cmpl   $0x9,-0x4(%rbp)
  je     L104
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  movb   $0x0,(%rax)
  cmpl   $0x2d,-0x4(%rbp)
  je     L274
  mov    -0x4(%rbp),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L274
  cmpl   $0x2e,-0x4(%rbp)
  je     L274
  cmpl   $0x73,-0x4(%rbp)
  jne    L242
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  cmp    $0x69,%al
  jne    L210
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x18(%rbp),%rax
  add    $0x2,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  cmp    $0x6e,%al
  jne    L86
  mov    $0x73,%eax
  jmp    L233
L86:
  mov    $0x5f,%eax
  jmp    L233
L210:
  cmpl   $0x77,-0x4(%rbp)
  jne    L134
  mov    $0x77,%eax
  jmp    L233
L134:
  mov    $0x5f,%eax
  jmp    L233
L242:
  cmpl   $0x64,-0x4(%rbp)
  jne    L136
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  cmp    $0x70,%al
  jne    L26
  mov    $0x64,%eax
  jmp    L233
L26:
  mov    $0x5f,%eax
  jmp    L233
L136:
  cmpl   $0x63,-0x4(%rbp)
  jne    L294
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  cmp    $0x6c,%al
  jne    L278
  mov    $0x63,%eax
  jmp    L233
L278:
  mov    $0x5f,%eax
  jmp    L233
L294:
  cmpl   $0x65,-0x4(%rbp)
  jne    L280
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  cmp    $0x78,%al
  jne    L236
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x18(%rbp),%rax
  add    $0x2,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  cmp    $0x70,%al
  jne    L84
  mov    $0x65,%eax
  jmp    L233
L84:
  mov    $0x5f,%eax
  jmp    L233
L236:
  mov    $0x5f,%eax
  jmp    L233
L280:
  mov    -0x4(%rbp),%eax
  jmp    L233
L274:
  movl   $0x0,-0x8(%rbp)
  cmpl   $0x2d,-0x4(%rbp)
  jne    L301
  mov    -0x8(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x8(%rbp)
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
L301:
  mov    -0x4(%rbp),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  je     L106
  mov    -0x8(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x2d,%al
  jne    L35
  mov    -0x8(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
L35:
  nop
L171:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  addl   $0x1,-0x8(%rbp)
  mov    -0x8(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L171
L106:
  cmpl   $0x2e,-0x4(%rbp)
  jne    L83
  nop
L302:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  addl   $0x1,-0x8(%rbp)
  mov    -0x8(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x4(%rbp),%edx
  mov    %dl,(%rax)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L302
L83:
  mov    -0x8(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  mov    D6(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x4(%rbp)
  je     L262
  mov    -0x4(%rbp),%eax
  mov    %eax,%edi
  call   <ungetch@plt>
L262:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2d,%al
  jne    L2
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L2
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  jmp    L233
L2:
  mov    $0x30,%eax
L233:
  leave
  ret
```

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';
}
```