user: 下面的汇编指令对应的C源代码是什么：

```asm
<writeLongcard>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x38,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  cmp    $0x10,%rdi
  jbe    L26
  mov    %rdi,%rax
  shr    $0x4,%rax
  mov    %rax,0x8(%rsp)
  cmp    $0x10f,%rdi
  jbe    L454
  mov    %rdi,%rax
  shr    $0x8,%rax
  mov    %rax,0x10(%rsp)
  cmp    $0x10ff,%rdi
  jbe    L20
  mov    %rdi,%r15
  shr    $0xc,%r15
  cmp    $0x10fff,%rdi
  jbe    L265
  mov    %rdi,%rbp
  shr    $0x10,%rbp
  cmp    $0x10ffff,%rdi
  jbe    L80
  mov    %rdi,%r12
  shr    $0x14,%r12
  cmp    $0x10fffff,%rdi
  jbe    L262
  mov    %rdi,%r13
  shr    $0x18,%r13
  cmp    $0x10ffffff,%rdi
  jbe    L193
  mov    %rdi,%rcx
  shr    $0x1c,%rcx
  cmp    $0x10,%rcx
  jbe    L123
  mov    %rdi,%r14
  shr    $0x20,%r14
  cmp    $0x10,%r14
  jbe    L450
  shr    $0x24,%rdi
  and    $0xf,%r14d
  mov    %rcx,0x18(%rsp)
  call   <writeLongcard>
  cmp    $0x9,%r14
  mov    0x18(%rsp),%rcx
  ja     L165
L212:
  mov    %rcx,0x18(%rsp)
  lea    0x30(%r14),%eax
L441:
  lea    0x27(%rsp),%r14
  mov    $0x1,%edx
  mov    $0x1,%edi
  mov    %al,0x27(%rsp)
  mov    %r14,%rsi
  call   <libc_write@plt>
  mov    0x18(%rsp),%rcx
L25:
  and    $0xf,%ecx
  cmp    $0x9,%rcx
  ja     L381
L423:
  add    $0x30,%ecx
L233:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    $0x1,%edi
  mov    %cl,0x27(%rsp)
  call   <libc_write@plt>
L23:
  and    $0xf,%r13d
  cmp    $0x9,%r13
  ja     L341
L45:
  add    $0x30,%r13d
L144:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    $0x1,%edi
  mov    %r13b,0x27(%rsp)
  call   <libc_write@plt>
L393:
  and    $0xf,%r12d
  cmp    $0x9,%r12
  ja     L438
L195:
  add    $0x30,%r12d
L111:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    $0x1,%edi
  mov    %r12b,0x27(%rsp)
  call   <libc_write@plt>
L239:
  and    $0xf,%ebp
  cmp    $0x9,%rbp
  ja     L294
L88:
  add    $0x30,%ebp
L431:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    $0x1,%edi
  mov    %bpl,0x27(%rsp)
  call   <libc_write@plt>
L342:
  and    $0xf,%r15d
  cmp    $0x9,%r15
  ja     L171
L322:
  add    $0x30,%r15d
L258:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    $0x1,%edi
  mov    %r15b,0x27(%rsp)
  call   <libc_write@plt>
L231:
  andq   $0xf,0x10(%rsp)
  mov    0x10(%rsp),%rax
  cmp    $0x9,%rax
  ja     L469
L459:
  movzbl 0x10(%rsp),%eax
  add    $0x30,%eax
L141:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    $0x1,%edi
  mov    %al,0x27(%rsp)
  call   <libc_write@plt>
L248:
  andq   $0xf,0x8(%rsp)
  mov    0x8(%rsp),%rax
  cmp    $0x9,%rax
  ja     L118
L60:
  movzbl 0x8(%rsp),%eax
  add    $0x30,%eax
L92:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    $0x1,%edi
  mov    %al,0x27(%rsp)
  call   <libc_write@plt>
L1:
  and    $0xf,%ebx
  cmp    $0x9,%rbx
  ja     L347
L105:
  add    $0x30,%ebx
L255:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    $0x1,%edi
  mov    %bl,0x27(%rsp)
  call   <libc_write@plt>
L159:
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L234
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L123:
  lea    0x27(%rsp),%r14
  cmp    $0x9,%rcx
  jbe    L423
  cmp    $0x10,%rcx
  je     L23
L381:
  add    $0x57,%ecx
  jmp    L233
L262:
  lea    0x27(%rsp),%r14
  cmp    $0x9,%r12
  jbe    L195
  cmp    $0x10,%r12
  je     L239
L438:
  add    $0x57,%r12d
  jmp    L111
L193:
  lea    0x27(%rsp),%r14
  cmp    $0x9,%r13
  jbe    L45
  cmp    $0x10,%r13
  je     L393
L341:
  add    $0x57,%r13d
  jmp    L144
L80:
  lea    0x27(%rsp),%r14
  cmp    $0x9,%rbp
  jbe    L88
  cmp    $0x10,%rbp
  je     L342
L294:
  add    $0x57,%ebp
  jmp    L431
  nopw   0x0(%rax,%rax,1)
L165:
  mov    %rcx,0x18(%rsp)
  lea    0x57(%r14),%eax
  jmp    L441
L265:
  lea    0x27(%rsp),%r14
  cmp    $0x9,%r15
  jbe    L322
  cmp    $0x10,%r15
  je     L231
L171:
  add    $0x57,%r15d
  jmp    L258
L454:
  cmpq   $0x9,0x8(%rsp)
  lea    0x27(%rsp),%r14
  jbe    L60
  cmpq   $0x10,0x8(%rsp)
  je     L1
L118:
  movzbl 0x8(%rsp),%eax
  add    $0x57,%eax
  jmp    L92
L20:
  cmpq   $0x9,0x10(%rsp)
  lea    0x27(%rsp),%r14
  jbe    L459
  cmpq   $0x10,0x10(%rsp)
  je     L248
L469:
  movzbl 0x10(%rsp),%eax
  add    $0x57,%eax
  jmp    L141
L26:
  cmp    $0x9,%rdi
  jbe    L460
  cmp    $0x10,%rdi
  je     L159
  lea    0x27(%rsp),%r14
L347:
  add    $0x57,%ebx
  jmp    L255
L234:
  call   <__stack_chk_fail@plt>
L460:
  lea    0x27(%rsp),%r14
  jmp    L105
L450:
  cmp    $0x9,%r14
  jbe    L212
  cmp    $0x10,%r14
  jne    L165
  lea    0x27(%rsp),%r14
  jmp    L25
```

assistant: ```c
void writeLongcard(long unsigned int l) {
  char ch;
  int i;
  if (l > 16) {
    writeLongcard(l / 16);
    writeLongcard(l % 16);
  } else if (l < 10) {
    ch = ((char)(((unsigned int)('0')) + ((unsigned int)(l))));
    i = libc_write(1, &ch, (size_t)1);
  } else if (l < 16) {
    ch = ((char)((((unsigned int)('a')) + ((unsigned int)(l))) - 10));
    i = libc_write(1, &ch, (size_t)1);
  }
}
```