|> (This is an excerpt from ping.c:in_cksum in netkit-0.10, sent to me by Petr
|> Vandrovec):
|>
|> register u_short *w = addr;
|> register int sum = 0;
|> u_short answer = 0;
|> ....
|> *(u_char*)(&answer) = *(u_char*)w;
|> sum += answer;
|>
|> This is a dumb way to write this.
|>
|> egcs-19990405 generates code that gets the right value, others (including
|> egcs-1.0.3 used to build RedHat-5.2, AFAIKS) break, as they don't respect
|> the initialization and put a random byte in the higher half.
|>
|> A better way to write the above is just:
|>
|> sum += *(u_char*)w;
This is not the same.
|> I can see no endianess issues here.
Think big (-endian).
-- Andreas Schwab "And now for something schwab@issan.cs.uni-dortmund.de completely different" schwab@gnu.org- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/