user: Translate the below assembly code into C programming language:

```asm
<getop>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
L56:
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %eax,-0x4(%rbp)
  mov    -0x4(%rbp),%eax
  mov    %eax,%edx
  mov    -0x18(%rbp),%rax
  mov    %dl,(%rax)
  cmpl   $0x20,-0x4(%rbp)
  je     L56
  cmpl   $0x9,-0x4(%rbp)
  je     L56
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  movb   $0x0,(%rax)
  mov    -0x4(%rbp),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  jne    L136
  cmpl   $0x2e,-0x4(%rbp)
  je     L136
  cmpl   $0x2d,-0x4(%rbp)
  je     L136
  cmpl   $0x65,-0x4(%rbp)
  je     L136
  cmpl   $0x45,-0x4(%rbp)
  je     L136
  mov    -0x4(%rbp),%eax
  jmp    L27
L136:
  movl   $0x0,-0x8(%rbp)
  cmpl   $0x2d,-0x4(%rbp)
  jne    L35
  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
  je     L120
  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)
  jmp    L35
L120:
  mov    -0x4(%rbp),%eax
  mov    %eax,%edi
  call   <ungetch@plt>
  mov    $0x2d,%eax
  jmp    L27
L35:
  mov    -0x4(%rbp),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  je     L34
  nop
L142:
  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    L142
L34:
  cmpl   $0x2e,-0x4(%rbp)
  jne    L82
  nop
L166:
  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    L166
L82:
  cmpl   $0x65,-0x4(%rbp)
  je     L131
  cmpl   $0x45,-0x4(%rbp)
  jne    L150
L131:
  nop
L170:
  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    L170
L150:
  mov    -0x8(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  mov    D2(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x4(%rbp)
  je     L101
  mov    -0x4(%rbp),%eax
  mov    %eax,%edi
  call   <ungetch@plt>
L101:
  mov    $0x30,%eax
L27:
  leave
  ret
```

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