RtlStringCbCopyExW

NTSTATUS __stdcall RtlStringCbCopyExW(
        WCHAR *pszDest,
        UINT64 cbDest,
        WCHAR *pszSrc,
        WCHAR **ppszDestEnd,
        UINT64 *pcbRemaining,
        UINT64 dwFlags){
  __int16 v6; 
  UINT64 v8; 
  int v11; 
  WCHAR *v12; 
  WCHAR *v13; 
  size_t v15; 
  __int64 v16[2]; 
  UINT64 pcchNewDestLength; 

  v6 = dwFlags;
  v8 = cbDest >> 1;
  v11 = 0;
  if( (dwFlags & 0x100) != 0 )
  {
    if( !pszDest && v8 || v8 > 0x7FFFFFFF )
      v11 = -1073741811;
  }
  else if( v8 - 1 > 0x7FFFFFFE )
  {
    v11 = -1073741811;
  }
  if( v11 < 0 )
  {
    if( v8 )
      *pszDest = 0;
    return v11;
  }
  pcchNewDestLength = (UINT64)pszDest;
  v12 = pszDest;
  v16[0] = cbDest >> 1;
  if( (dwFlags & 0x100) != 0 )
  {
    v13 = (WCHAR *)&::ppszDestEnd;
    if( pszSrc )
      v13 = pszSrc;
    pszSrc = v13;
  }
  v11 = 0;
  if( (dwFlags & 0xFFFFE000) != 0 )
  {
    v11 = -1073741811;
    if( v8 )
      *pszDest = 0;
  }
  else
  {
    if( !v8 )
    {
      if( !*pszSrc )
        goto LABEL_14;
      v11 = pszDest != 0i64 ? -2147483643 : -1073741811;
LABEL_13:
      if( v11 >= 0 )
      {
LABEL_14:
        if( ppszDestEnd )
          *ppszDestEnd = v12;
        if( pcbRemaining )
          *pcbRemaining = (cbDest & 1) + 2 * v8;
        return v11;
      }
      goto LABEL_26;
    }
    pcchNewDestLength = 0i64;
    v11 = RtlStringCopyWorkerW((_NTSTRSAFE_PWSTR)pszDest, v8, (size_t *)&pcchNewDestLength, pszSrc, v15);
    v8 -= pcchNewDestLength;
    v16[0] = v8;
    v12 = &pszDest[pcchNewDestLength];
    pcchNewDestLength = (UINT64)v12;
    if( v11 >= 0 )
    {
      if( (v6 & 0x200) != 0 )
      {
        pszSrc = (WCHAR *)((cbDest & 1) + 2 * v8);
        if( (unsigned __int64)pszSrc > 2 )
          memset(v12 + 1, (unsigned __int8)v6, (_DWORD)pszSrc - 2);
      }
      goto LABEL_13;
    }
  }
LABEL_26:
  if( (v6 & 0x1C00) != 0 && cbDest )
  {
    StringExHandleOtherFlagsW(pszDest, cbDest, (WCHAR **)pszSrc, &pcchNewDestLength, (UINT64)v16);
    v12 = (WCHAR *)pcchNewDestLength;
    v8 = v16[0];
  }
  if( (int)(v11 + 0x80000000) < 0 || v11 == -2147483643 )
    goto LABEL_14;
  return v11;
}

Referenced by: