user: 请从给定的汇编指令推导出C源代码：

```asm
<zzz>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x68(%rbp)
  mov    %rsi,-0x70(%rbp)
  mov    %edx,-0x74(%rbp)
  mov    %rcx,-0x80(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%r15
  movl   $0x5,-0x50(%rbp)
  mov    -0x50(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,-0x90(%rbp)
  movq   $0x0,-0x88(%rbp)
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x48(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  movslq %eax,%rdx
  mov    %rdx,%r10
  mov    $0x0,%r11d
  movslq %eax,%rbx
  movslq %eax,%rdx
  mov    %rdx,%r8
  mov    $0x0,%r9d
  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
L33:
  cmp    %rdx,%rsp
  je     L17
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L33
L17:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L57
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L57:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x40(%rbp)
  movl   $0x0,-0x54(%rbp)
  jmp    L94
L93:
  mov    -0x54(%rbp),%edx
  mov    -0x70(%rbp),%rax
  add    %rdx,%rax
  mov    -0x54(%rbp),%ecx
  mov    -0x68(%rbp),%rdx
  add    %rcx,%rdx
  movzbl (%rax),%eax
  mov    %al,(%rdx)
  addl   $0x1,-0x54(%rbp)
L94:
  mov    -0x74(%rbp),%eax
  cmp    %eax,-0x54(%rbp)
  jb     L93
  mov    -0x50(%rbp),%eax
  and    $0x3,%eax
  mov    %eax,-0x4c(%rbp)
  cmpl   $0x0,-0x4c(%rbp)
  setne  %al
  movzbl %al,%edx
  mov    -0x50(%rbp),%eax
  add    %edx,%eax
  add    %eax,-0x74(%rbp)
  mov    -0x80(%rbp),%rax
  mov    -0x74(%rbp),%edx
  mov    %edx,(%rax)
  mov    %rsp,%r14
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rbx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L80:
  cmp    %rdx,%rsp
  je     L116
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L80
L116:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L77
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L77:
  mov    %rsp,%rax
  lea    (%rax),%r12
  mov    -0x40(%rbp),%rax
  mov    %r12,%rcx
  mov    %rbx,%rdx
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rbx,%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
L52:
  cmp    %rdx,%rsp
  je     L42
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L52
L42:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L31
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L31:
  mov    %rsp,%rax
  lea    (%rax),%r13
  mov    -0x40(%rbp),%rax
  mov    %r13,%rcx
  mov    %rbx,%rdx
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  mov    %r13,%rsi
  mov    %r12,%rdi
  mov    $0x0,%eax
  call   <foo@plt>
  mov    %r14,%rsp
  mov    %r15,%rsp
  nop
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L89
  call   <__stack_chk_fail@plt>
L89:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
void zzz(char *s1, char *s2, int len, int *q) {
  int z = 5;
  unsigned int i, b;
  struct {
    char a[z];
  } x;
  for (i = 0; i < len; i++)
    s1[i] = s2[i];
  b = z & 0x3;
  len += (b == 0 ? 0 : 1) + z;
  *q = len;
  foo(x, x);
}
```