user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<print_label>:
  endbr64
  push   %r15
  mov    %edx,%r15d
  push   %r14
  push   %r13
  mov    %r8d,%r13d
  push   %r12
  mov    %ecx,%r12d
  push   %rbp
  mov    %esi,%ebp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x8,%rsp
  cmpb   $0x20,(%rdi)
  jne    L177
  nopl   (%rax)
L182:
  add    $0x1,%rbx
  cmpb   $0x20,(%rbx)
  je     L182
L177:
  mov    %rbx,%rdi
  call   <strlen@plt>
  mov    %eax,%r14d
  cmp    %ebp,%eax
  jle    L276
  movslq %ebp,%r14
  add    %rbx,%r14
  cmp    %rbx,%r14
  je     L280
  mov    %r14,%rax
  jmp    L217
  nopl   0x0(%rax,%rax,1)
L344:
  cmp    %rbx,%rax
  je     L153
L217:
  movzbl (%rax),%ecx
  mov    %rax,%rdx
  lea    -0x1(%rax),%rax
  cmp    $0x20,%cl
  jne    L344
  nopl   0x0(%rax,%rax,1)
L60:
  mov    %rdx,%r14
  lea    -0x1(%rdx),%rdx
  cmpb   $0x20,-0x1(%r14)
  je     L60
  cmp    %r14,%rbx
  je     L271
  test   %r15d,%r15d
  jne    L229
L191:
  add    $0x8,%rsp
  mov    %r14,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L271:
  test   %r15d,%r15d
  je     L191
  xor    %ebx,%ebx
L41:
  lea    -0x1(%rbp),%r15d
  test   %ebp,%ebp
  jle    L191
  test   %r12d,%r12d
  je     L251
  add    %ebx,%ebp
  nopl   0x0(%rax)
L384:
  add    $0x1,%ebx
  mov    %ebx,%eax
  cltd
  idiv   %r12d
  test   %edx,%edx
  jne    L319
L21:
  mov    %r13d,%edi
  call   <putchar@plt>
  cmp    %ebp,%ebx
  je     L191
  add    $0x1,%ebx
  mov    %ebx,%eax
  cltd
  idiv   %r12d
  test   %edx,%edx
  je     L21
L319:
  mov    $0x20,%edi
  call   <putchar@plt>
  cmp    %ebp,%ebx
  jne    L384
  jmp    L191
  xchg   %ax,%ax
L251:
  mov    $0x20,%edi
  call   <putchar@plt>
  sub    $0x1,%r15d
  jb     L191
  mov    $0x20,%edi
  call   <putchar@plt>
  sub    $0x1,%r15d
  jae    L251
  jmp    L191
  nopl   (%rax)
L153:
  cmpb   $0x20,(%rbx)
  je     L242
  test   %r15d,%r15d
  je     L191
L229:
  mov    %rbx,%r15
  nopl   (%rax)
L172:
  movsbl (%r15),%edi
  add    $0x1,%r15
  call   <putchar@plt>
  cmp    %r15,%r14
  jne    L172
  mov    %r14,%rax
  sub    %rbx,%rax
  mov    %eax,%ebx
  sub    %eax,%ebp
  jmp    L41
  nopl   0x0(%rax)
L276:
  test   %r15d,%r15d
  je     L295
  movsbl (%rbx),%edi
  xor    %r15d,%r15d
  test   %dil,%dil
  je     L340
  nopl   0x0(%rax,%rax,1)
L294:
  call   <putchar@plt>
  movsbl 0x1(%rbx),%edi
  add    $0x1,%rbx
  add    $0x1,%r15d
  test   %dil,%dil
  jne    L294
L340:
  lea    0x1(%r14),%ebx
  cmp    %ebp,%r14d
  jge    L295
  test   %r12d,%r12d
  je     L7
  sub    %r14d,%ebp
  add    %r15d,%ebp
  nopw   0x0(%rax,%rax,1)
L248:
  add    $0x1,%r15d
  mov    %r15d,%eax
  cltd
  idiv   %r12d
  test   %edx,%edx
  jne    L149
  mov    %r13d,%edi
  call   <putchar@plt>
  cmp    %r15d,%ebp
  jne    L248
  nopl   0x0(%rax)
L295:
  xor    %r14d,%r14d
  jmp    L191
L7:
  add    $0x1,%ebp
  nopl   0x0(%rax,%rax,1)
L160:
  mov    $0x20,%edi
  add    $0x1,%ebx
  call   <putchar@plt>
  cmp    %ebp,%ebx
  jne    L160
  jmp    L295
  nopl   0x0(%rax,%rax,1)
L149:
  mov    $0x20,%edi
  call   <putchar@plt>
  cmp    %r15d,%ebp
  jne    L248
  jmp    L295
L280:
  cmpb   $0x20,(%rbx)
  jne    L271
L242:
  mov    %rbx,%rdx
  jmp    L60
```

assistant: ```c
char *print_label(char *s, int len, int pflag, int spacing, int dot) {
  char *x;
  int n;
  int i;
  while (*s == ' ')
    s++;
  n = strlen(s);
  if (n <= len) {
    if (pflag) {
      i = 0;
      while (*s) {
        putchar(*s++);
        i++;
      }
      while (n++ < len)
        putchar(spacing && ++i % spacing == 0 ? dot : ' ');
    }
    return NULL;
  }
  for (x = s + len; x != s; x--)
    if (*x == ' ')
      break;
  if (*x != ' ')
    x = s + len;
  else {
    while (*x == ' ')
      x--;
    x++;
  }
  i = 0;
  while (s != x) {
    if (pflag)
      putchar(*s);
    i++;
    s++;
    len--;
  }
  if (pflag) {
    while (len-- > 0)
      putchar(spacing && ++i % spacing == 0 ? dot : ' ');
  }
  return s;
}
```