[lwip-devel] [patch #8882] Vector improvements

[Joel Cunningham]

Follow-up Comment #32, patch #8882 (project lwip):

As I was working on updating my old patch, I was studying
lwip_netconn_do_writemore() and one thing that is curious is why write_offset
is a member of struct netconn and not struct api_msg (under the "w" union).

write_offset is only used by lwip_netconn_do_writemore() to store offset into
the dataptr.  When a write is not in progress, the variable seems to have no
use.  I'm wonder if write_offset could be relocated to struct api_msg and
reduce the size of struct netconn.

Digging through git, it looks like write_offset was added with 3 others way
back in 9f05cabf872919828eda2138170e6eaded510fdf.  

My vector work is looking at having to add an offset into current vector in
addition to write_offset and it might be better to put that in struct api_msg

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