Re: [pdf-devel] pdf-i64 macros

[Aleksander Morgado]

>    Yep, due to the error report they are not fully compatible (the macros 
>    don't return a pdf_status_t as the functions do).
>
>    What about forgetting the errors in the 64bit module and set all 
>    functions returning void?
>
> Errors can happens in the pdf-64t code, so we definitely dont want to
> ignore the error conditions.
>
> Maybe we could use one of the values of the 64bit integers (such as
> the larger one) and to recognize an error condition when that special
> value is found in a result.
>
> So:
>
>    pdf_i64_add(&bignum1, bignum2, bignum3);
>    if (pdf_i64_invalid_p(bignum1))
>    {
>     /* An error occurred */
>    }

As talked in the irc, could be better to pass a reference to the status 
variable to the function so that it can safely return void:

void
pdf_i64_sum(pdf_i64_t *result,
            pdf_i64_t num1,
            pdf_i64_t num2,
            pdf_status_t *p_status)

In this way, the macros will directly place PDF_OK in *p_status.

Then we can check the status value to see if the operation went ok or not.