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4c76fd500c
This moves the write_offset variable from struct netconn to struct api_msg This optimizes the storage by only having the space claimed when it is needed (during a netconn_write_partly() call) and not throughout the lifetime of the netconn This also reduces code space/execution by not having to separately manage clearing/checking write_offset from the current_msg pointer Lastly, we also save execution by using msg.w.offset as the output rather than marshaling the result to msg.w.len. Previously, len was used as input length of dataptr and output for the write operation. netconn_write_partly() also has access to msg.w.offset, so we can use that