Re: [lwip-devel] What is xchar() macro?

[Ambroz Bizjak]

My guess is that xchar is completely nonstandard and the code works
only because <ctype.h> is not included leading to the custom
definitions within "#ifndef isprint" to be used. Might be interesting
to see what happens if one adds #include <ctype.h> at the top of
ip6_addr.c

On Wed, Nov 1, 2017 at 1:05 PM, goldsimon <address@hidden> wrote:
>
>
> Ambroz Bizjak wrote:
>>Clearly xchar(i) returns the uppercase hexadecimal char for the given
>>integer in range [0,15], or in other words "0123456789ABCDEF"[i].
>
> Of course. I rather read Joel's question like "where is this function 
> standardized to keep the lwip code portable when using it".
>
> Simon
>
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