[lwip-devel] pbuf_cat() does not update total_len

[Laurenz Kamp]

Hello,

let's assume I want to merge two pbufs into one and I use pbuf_cat() for the 
task.
a and b are the pbufs I want to merge:

First pbuf:     a.len = 10;
                a.total_len = 10;
                a.next = NULL;
Second pbuf:    b.len = 15;
                b.total_len = 15;
                b.next = NULL;

After I call pbuf_cat(a, b), I have the following setup:

First pbuf:     a.len = 10;
                a.total_len = 25;
                a.next = b;
Second pbuf:    b.len = 15;
                b.total_len = 15;  <-- Should be 25.
                b.next = NULL;


As far as I understand, all pbufs in a chain have the same total_len value, but 
pbuf_cat doesn't
update b.total_len. Is this behavior intentioned or a bug?


Best regards,

Laurenz Kamp