RtlStringCchCatNW

NTSTATUS __stdcall RtlStringCchCatNW(PWCHAR pszDest, UINT64 cchDest, PWCHAR pszSrc, UINT64 cchToAppend){
  NTSTATUS v5; 
  UINT64 v8; 
  PWCHAR i; 
  UINT64 v10; 
  WCHAR *v11; 
  UINT64 v12; 
  UINT64 v13; 
  char *v14; 
  WCHAR v15; 
  WCHAR *v16; 
  v5 = 0;
  if( cchDest - 1 > 0x7FFFFFFE )
    v5 = -1073741811;
  if( v5 < 0 )
    goto LABEL_21;
  v8 = cchDest;
  for( i = pszDest; v8; --v8 )
  {
    if( !*i )
      break;
    ++i;
  }
  v5 = v8 == 0 ? 0xC000000D : 0;
  if( v8 )
    v10 = cchDest - v8;
  else
LABEL_21:
    v10 = 0i64;
  if( v5 >= 0 )
  {
    if( cchToAppend > 0x7FFFFFFE )
    {
      return -1073741811;
    }
    else
    {
      v11 = &pszDest[v10];
      v12 = cchDest - v10;
      if( cchDest != v10 )
      {
        v13 = cchToAppend;
        v14 = (char *)((char *)pszSrc - (char *)v11);
        do
        {
          if( !v13 )
            break;
          v15 = *(WCHAR *)((char *)v11 + (_QWORD)v14);
          if( !v15 )
            break;
          *v11 = v15;
          --v13;
          ++v11;
          --v12;
        }
        while( v12 );
      }
      v16 = v11 - 1;
      if( v12 )
        v16 = v11;
      v5 = v12 == 0 ? 0x80000005 : 0;
      *v16 = 0;
    }
  }
  return v5;
}

Referenced by: