user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<repeat>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x58,%rsp
  mov    %rdi,-0x68(%rbp)
  mov    %rsi,-0x70(%rbp)
  mov    %edx,-0x74(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  mov    -0x68(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,-0x50(%rbp)
  mov    -0x50(%rbp),%eax
  add    $0x3c,%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x48(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r14
  mov    $0x0,%r15d
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L60:
  cmp    %rdx,%rsp
  je     L53
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L60
L53:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L68
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L68:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x40(%rbp)
  movl   $0x0,-0x54(%rbp)
  mov    -0x50(%rbp),%edx
  mov    -0x68(%rbp),%rcx
  mov    -0x40(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x50(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x68(%rbp),%rax
  mov    $0x3c,%edx
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  mov    D29(%rip),%rax
  mov    (%rax),%edx
  mov    -0x70(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <fputs@plt>
  jmp    L50
L22:
  mov    -0x74(%rbp),%eax
  mov    $0x3c,%edx
  cmp    %edx,%eax
  cmovg  %edx,%eax
  mov    %eax,-0x4c(%rbp)
  mov    D29(%rip),%rax
  mov    (%rax),%edx
  mov    -0x54(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x40(%rbp),%rax
  lea    (%rcx,%rax,1),%rdi
  mov    -0x4c(%rbp),%eax
  mov    %edx,%ecx
  mov    $0x1,%edx
  mov    %eax,%esi
  call   <fwrite@plt>
  mov    -0x4c(%rbp),%eax
  add    %eax,-0x54(%rbp)
  mov    -0x54(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jle    L44
  mov    -0x50(%rbp),%eax
  sub    %eax,-0x54(%rbp)
L44:
  mov    D29(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,%esi
  mov    $0xa,%edi
  call   <fputc@plt>
  mov    -0x4c(%rbp),%eax
  sub    %eax,-0x74(%rbp)
L50:
  cmpl   $0x0,-0x74(%rbp)
  jg     L22
  mov    %rbx,%rsp
  nop
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L30
  call   <__stack_chk_fail@plt>
L30:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
void repeat(const char *alu, const char *title, int n) {
  int len = strlen(alu);
  char buffer[len + 60];
  int pos = 0;
  memcpy(buffer, alu, len);
  memcpy(buffer + len, alu, 60);
  fputs(title, stdout);
  while (n > 0) {
    int bytes = n > 60 ? 60 : n;
    fwrite(buffer + pos, bytes, 1, stdout);
    pos += bytes;
    if (pos > len) {
      pos -= len;
    }
    fputc('\n', stdout);
    n -= bytes;
  }
}
```