user: 这段汇编代码用C语言表示是什么样的:

```asm
<tv_standard>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <FS460_get_tv_standard@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  je     L16
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D52(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L90
L16:
  lea    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <FS460_get_available_tv_standards@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  je     L94
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D67(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L90
L94:
  mov    -0x10(%rbp),%rax
  test   %rax,%rax
  je     L90
  mov    -0x28(%rbp),%rax
  lea    D2(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  jne    L99
L151:
  mov    -0x18(%rbp),%rax
  add    %rax,%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  test   %rax,%rax
  jne    L2
  movq   $0x1,-0x18(%rbp)
L2:
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  and    %rdx,%rax
  test   %rax,%rax
  je     L151
  jmp    L60
L99:
  mov    -0x28(%rbp),%rax
  lea    D64(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  jne    L81
L157:
  mov    -0x18(%rbp),%rax
  shr    %rax
  mov    %rax,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  test   %rax,%rax
  jne    L163
  mov    $0x80000000,%eax
  mov    %rax,-0x18(%rbp)
L163:
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  and    %rdx,%rax
  test   %rax,%rax
  je     L157
  jmp    L60
L81:
  mov    -0x28(%rbp),%rax
  lea    D32(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L60
  lea    D83(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  jmp    L90
L60:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <FS460_set_tv_standard@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  je     L47
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D31(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L90
L47:
  lea    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <FS460_get_tv_standard@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  je     L27
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D81(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L90
L27:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <str_TVStandard@plt>
  mov    %rax,%rsi
  lea    D78(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
L90:
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L24
  call   <__stack_chk_fail@plt>
L24:
  leave
  ret
```

tool_calls: name: parse_data
arguments: data_label: D52
type: string
name: parse_data
arguments: data_label: D67
type: string
name: parse_data
arguments: data_label: D2
type: string
name: parse_data
arguments: data_label: D64
type: string
name: parse_data
arguments: data_label: D32
type: string
name: parse_data
arguments: data_label: D83
type: string
name: parse_data
arguments: data_label: D31
type: string
name: parse_data
arguments: data_label: D81
type: string
name: parse_data
arguments: data_label: D78
type: string

tool: D52: error %u getting tv standard.


tool: D67: error %u getting available tv standards.


tool: D2: +

tool: D64: -

tool: 

tool: D83: Invalid command.

tool: D31: error %u setting TV standard.


tool: D81: error %u getting TV standard after set.


tool: D78:   TV Standard=%s


assistant: ```c
void tv_standard(char *mod) {
  int err;
  unsigned long tv_standard, available_tv_standards;
  err = FS460_get_tv_standard(&tv_standard);
  if (err) {
    printf("error %u getting tv standard.\n", err);
    return;
  }
  err = FS460_get_available_tv_standards(&available_tv_standards);
  if (err) {
    printf("error %u getting available tv standards.\n", err);
    return;
  }
  if (available_tv_standards) {
    if (0 == strcmp(mod, "+")) {
      do {
        tv_standard <<= 1;
        if (!tv_standard)
          tv_standard = 1;
      } while (!(tv_standard & available_tv_standards));
    } else if (0 == strcmp(mod, "-")) {
      do {
        tv_standard >>= 1;
        if (!tv_standard)
          tv_standard = 0x80000000;
      } while (!(tv_standard & available_tv_standards));
    } else if (0 != strcmp(mod, "")) {
      printf("Invalid command.\n");
      return;
    }
    err = FS460_set_tv_standard(tv_standard);
    if (err)
      printf("error %u setting TV standard.\n", err);
    else {
      err = FS460_get_tv_standard(&tv_standard);
      if (err)
        printf("error %u getting TV standard after set.\n", err);
      else
        printf("  TV Standard=%s\n", str_TVStandard(tv_standard));
    }
  }
}
```