I don't love the code style in terms of indentation, line length, alignment and bracket placing but IMO at least it doesn't look childish / reckless.
I think there could be bug in he_internal_send_auth_userpass when it copies the strings because when calculating the string lengths it uses the size of he_conn->username and he_conn->password which are "HE_CONFIG_TEXT_FIELD_LENGTH +1" whereas the sizes of the destination fields in he_msg_auth_t are "HE_CONFIG_TEXT_FIELD_LENGTH" so .
Take it with a grain of salt, I just took a very quick look mostly to see if I liked the coding style and it's far too early for my brain to be functional but it seemed that way to me. Other than that I didn't hate the code which is cool!
Disclaimer: I'm an employee of ExpressVPN and work on this codebase.
The specific reason for the size disparity is that we require he_conn->{username,password} to be null-terminated, whereas we do NOT require he_msg_auth->{username,password} to be null-terminated. I remember raising the same point and being convinced that we had a good reason for doing so, but I also haven't had enough coffee to remember what the good reason was!
Regardless of whether this is a "bug" or not I do think that the disparity points to something that unnecessarily causes confusion, will have a think about making it more consistent.
Regarding style -- I also ~hate if(x==0) without the space after the if but we committed to consistency instead of arguing over it via clang-format. To quote Rob Pike, "Gofmt's style is no one's favorite, yet gofmt is everyone's favorite."
Sorry about the late reply, I didn't realize there was a reply to my message. I reviewed it once again and can attest that what you say is correct, so that's cool.
I think there could be bug in he_internal_send_auth_userpass when it copies the strings because when calculating the string lengths it uses the size of he_conn->username and he_conn->password which are "HE_CONFIG_TEXT_FIELD_LENGTH +1" whereas the sizes of the destination fields in he_msg_auth_t are "HE_CONFIG_TEXT_FIELD_LENGTH" so .
Take it with a grain of salt, I just took a very quick look mostly to see if I liked the coding style and it's far too early for my brain to be functional but it seemed that way to me. Other than that I didn't hate the code which is cool!
Thanks for opening it!