On Thu, Mar 05, 2020 at 05:00:58PM +0200, Leon Romanovsky wrote: > > +/** > + * FIELD_SIZEOF - get the size of a struct's field > + * @t: the target struct > + * @f: the target struct's field > + * Return: the size of @f in the struct definition without having a > + * declared instance of @t. > + */ > +#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) This is already sizeof_field > +/** > + * field_avail - check if specific field exists in provided data > + * @x: the source data, usually struct received from the user > + * @fld: field name > + * @sz: size of the data > + */ > +#define field_avail(x, fld, sz) \ > + (offsetof(typeof(x), fld) + FIELD_SIZEOF(typeof(x), fld) <= (sz)) This is just offsetofend, I'm not sure there is such a reason to even have this field_avail macro really.. Jason
