[PATCH v2 1/2] propsys: Implement VariantToStringWithDefault.

[Nikolay Sivov]

On 3/28/22 03:16, Mohamad Al-Jaf wrote:
> +/******************************************************************
> + *  VariantToStringWithDefault   (PROPSYS.@)
> + */
> +PCWSTR WINAPI VariantToStringWithDefault(const VARIANT *pvar, LPCWSTR pszDefault)
> +{
> +    TRACE("(%p, %s)\n", pvar, debugstr_w(pszDefault));
> +
> +    switch(V_VT(pvar))
> +    {
> +        case VT_BSTR:
> +        {
> +            if (V_BSTR(pvar) == NULL)
> +                return L"";
> +
> +            return V_BSTR(pvar);
> +        }
> +        case VT_BYREF | VT_BSTR:
> +        {
> +            if (*V_BSTRREF(pvar) == NULL)
> +                return L"";
> +
> +            return *V_BSTRREF(pvar);
> +        }
> +        case VT_BYREF | VT_VARIANT:
> +        {
> +            if (V_VT(V_VARIANTREF(pvar)) == VT_BSTR)
> +            {
> +                if (V_BSTR(V_VARIANTREF(pvar)) == NULL)
> +                    return L"";
> +
> +                return V_BSTR(V_VARIANTREF(pvar));
> +            }
> +
> +            if (V_VT(V_VARIANTREF(pvar)) == (VT_BYREF | VT_BSTR))
> +            {
> +                if (*V_BSTRREF(V_VARIANTREF(pvar)) == NULL)
> +                    return L"";
> +
> +                return *V_BSTRREF(V_VARIANTREF(pvar));
> +            }
> +        }
> +    }
> +
> +    return pszDefault;
> +}
There is a lot of duplication you don't need. You can first dereference 
a variant if needed, and then use same path for both plain variant and 
variant reference. Similar for BSTR references.