user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<cms_copy_content>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x40,%rsp
  mov    %rdi,-0x1028(%rbp)
  mov    %rsi,-0x1030(%rbp)
  mov    %edx,-0x1034(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x1020(%rbp)
  movq   $0x0,-0x1018(%rbp)
  cmpq   $0x0,-0x1028(%rbp)
  jne    L136
  mov    $0x0,%eax
  call   <BIO_s_null@plt>
  mov    %eax,%edi
  call   <BIO_new@plt>
  mov    %rax,-0x1018(%rbp)
  jmp    L69
L136:
  mov    D19(%rip),%rax
  mov    (%rax),%eax
  and    -0x1034(%rbp),%eax
  test   %eax,%eax
  je     L150
  mov    $0x0,%eax
  call   <BIO_s_mem@plt>
  mov    %eax,%edi
  call   <BIO_new@plt>
  mov    %rax,-0x1018(%rbp)
  mov    -0x1018(%rbp),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <BIO_set_mem_eof_return@plt>
  jmp    L69
L150:
  mov    -0x1028(%rbp),%rax
  mov    %rax,-0x1018(%rbp)
L69:
  cmpq   $0x0,-0x1018(%rbp)
  jne    L128
  mov    D61(%rip),%rax
  mov    (%rax),%edx
  mov    D3(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <CMSerr@plt>
  jmp    L205
L128:
  lea    -0x1010(%rbp),%rcx
  mov    -0x1030(%rbp),%rax
  mov    $0x1000,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <BIO_read@plt>
  mov    %eax,-0x101c(%rbp)
  cmpl   $0x0,-0x101c(%rbp)
  jg     L88
  mov    -0x1030(%rbp),%rax
  mov    %rax,%rdi
  call   <BIO_method_type@plt>
  mov    D40(%rip),%rdx
  mov    (%rdx),%rdx
  cmp    %rdx,%rax
  jne    L168
  mov    -0x1030(%rbp),%rax
  mov    %rax,%rdi
  call   <BIO_get_cipher_status@plt>
  test   %eax,%eax
  je     L92
L168:
  cmpl   $0x0,-0x101c(%rbp)
  jns    L189
  jmp    L205
L88:
  cmpq   $0x0,-0x1018(%rbp)
  je     L128
  mov    -0x101c(%rbp),%edx
  lea    -0x1010(%rbp),%rcx
  mov    -0x1018(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <BIO_write@plt>
  cmp    %eax,-0x101c(%rbp)
  jne    L129
  jmp    L128
L189:
  nop
  mov    D19(%rip),%rax
  mov    (%rax),%eax
  and    -0x1034(%rbp),%eax
  test   %eax,%eax
  je     L81
  mov    -0x1028(%rbp),%rdx
  mov    -0x1018(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <SMIME_text@plt>
  test   %eax,%eax
  jne    L81
  mov    D14(%rip),%rax
  mov    (%rax),%edx
  mov    D3(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <CMSerr@plt>
  jmp    L205
L81:
  movl   $0x1,-0x1020(%rbp)
  jmp    L205
L92:
  nop
  jmp    L205
L129:
  nop
L205:
  cmpq   $0x0,-0x1018(%rbp)
  je     L32
  mov    -0x1018(%rbp),%rax
  cmp    -0x1028(%rbp),%rax
  je     L32
  mov    -0x1018(%rbp),%rax
  mov    %rax,%rdi
  call   <BIO_free@plt>
L32:
  mov    -0x1020(%rbp),%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L3
  call   <__stack_chk_fail@plt>
L3:
  leave
  ret
```

assistant: ```c
int cms_copy_content(BIO *out, BIO *in, unsigned int flags) {
  unsigned char buf[4096];
  int r = 0, i;
  BIO *tmpout = NULL;
  if (out == NULL)
    tmpout = BIO_new(BIO_s_null());
  else if (flags & CMS_TEXT) {
    tmpout = BIO_new(BIO_s_mem());
    BIO_set_mem_eof_return(tmpout, 0);
  } else
    tmpout = out;
  if (!tmpout) {
    CMSerr(CMS_F_CMS_COPY_CONTENT, ERR_R_MALLOC_FAILURE);
    goto err;
  }
  for (;;) {
    i = BIO_read(in, buf, sizeof(buf));
    if (i <= 0) {
      if (BIO_method_type(in) == BIO_TYPE_CIPHER) {
        if (!BIO_get_cipher_status(in))
          goto err;
      }
      if (i < 0)
        goto err;
      break;
    }
    if (tmpout && (BIO_write(tmpout, buf, i) != i))
      goto err;
  }
  if (flags & CMS_TEXT) {
    if (!SMIME_text(tmpout, out)) {
      CMSerr(CMS_F_CMS_COPY_CONTENT, CMS_R_SMIME_TEXT_ERROR);
      goto err;
    }
  }
  r = 1;
err:
  if (tmpout && (tmpout != out))
    BIO_free(tmpout);
  return r;
}
```