_IO_SEEKOFF
return _IO_SEEKOFF (this, off, dir, mode);
if (_IO_SEEKOFF (fp, (_IO_off64_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT)
return _IO_SEEKOFF (fp, pos, 0, mode);
return _IO_SEEKOFF (fp, offset, dir, mode);
return _IO_SEEKOFF (fp, pos, 0, mode);