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(emacs)Comments in C

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Comments in C Modes
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   C mode and related modes use a number of variables for controlling
comment format.

`c-comment-only-line-offset'
     Extra offset for line which contains only the start of a comment.
     It can be either an integer or a cons cell of the form
     `(NON-ANCHORED-OFFSET . ANCHORED-OFFSET)', where
     NON-ANCHORED-OFFSET is the amount of offset given to
     non-column-zero anchored comment-only lines, and ANCHORED-OFFSET
     is the amount of offset to give column-zero anchored comment-only
     lines.  Just an integer as value is equivalent to `(VAL . 0)'.

`c-comment-start-regexp'
     This buffer-local variable specifies how to recognize the start of
     a comment.

`c-hanging-comment-ender-p'
     If this variable is `nil', `c-fill-paragraph' leaves the comment
     terminator of a block comment on a line by itself.  The default
     value is `t', which puts the comment-end delimiter `*/' at the end
     of the last line of the comment text.

`c-hanging-comment-starter-p'
     If this variable is `nil', `c-fill-paragraph' leaves the starting
     delimiter of a block comment on a line by itself.  The default
     value is `t', which puts the comment-start delimiter `/*' at the
     beginning of the first line of the comment text.