I found some more issues.

First, there is no rule for an element in an else clause:


if (true)
   do_something();
else
do_something_else();


"do_something_else" is not indented.

There is also something weird with the bsd indent style.  It indents 
do_something and do_something_else to parent-bol with 0 offset, so the 
result is:

if (true)
do_something();
else
do_something_else();


It is very different from the bsd style from c-mode, which produces this:

if (true)
	do_something();
else
	do_something_else();

By looking at random files from OpenBSD, they do indent their 
expressions inside if and else:

<https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/net/bsd-comp.c?rev=1.17&content-type=text/plain>
(lines 277, 484, and 527)



Also there is a second patch which tries to handle specific types of 
comments.  I don't know how popular it is, but some people use these 
kind of comments:

/*---------.
| %param.  |
`---------*/

Here we want the vertical bar ("|") to be indented at the same column as 
the first "/".

Currently the result is this:

/*---------.
   | %param.  |
   `---------*/

This patch is a just proof of concept.  If this new behavior is indeed 
wanted, I would clean it up and adapt other modes.