Re: [lwip-devel] Bug in Checksum implementation and ARP fix

[Kenneth Porter]

--On Tuesday, October 21, 2003 10:19 AM +0100 Kieran Mansley 
<address@hidden> wrote:

> I'm not sure I understand this concept (the different types of casts - not
> using macros!).  Can you explain what the difference's might be between
> the macros for the different types of casts?

In the example given, the code is attempting to extract a 16-bit native 
value from a byte buffer with native endianness and no alignment, so the 
macro might be hbb2hs (host byte buffer to host short). Horrible name, I 
agree, and I'm open to suggestions.

Using a raw cast to do this gives no information to the maintainer about 
what's really being attempted, or what assumptions are being made. The cast 
is an implementation detail, not the design. It's an ambiguous and 
error-prone idiom.