problem with c-indent-line-or-region

[Greg Hill]

When I set up C indentation to leave the indentation of block comments unchanged, c-indent-line-or-region is sometimes broken by the presence of parentheses within block comments.

With the files junk.c and bug.el shown below in my current directory, I execute the command line shown below and get the debugger output shown at the bottom.

The problem appears to depend on the behavior of the built-in function forward-comment, which is called from c-forward-comment, which is called from c-backward-syntactic-ws.  If '(forward-comment (- (point-max))) is executed when point is just after the comment-closing "*/", point does not move.  But if a space character is inserted in front of the "(A)", then '(forward-comment (- (point-max))) moves point to in front of the "/*".

Inserting a space in front of the "(A)" also makes the problem in c-indent-line-or-region go away.

junk.c

--------------------

/*

(A)

1)

*/

void dummy ()

{

  return;

}

bug.el

--------------------

(defun bugtest ()

  (setq c-mode-hook nil)

  (add-hook 'c-mode-hook

            (function

             (lambda ()

               (setq

                ;;Problem depends in part on the line below

                c-offsets-alist '((c . c-lineup-dont-change))

                tab-width 2)

               (c-set-style "gnu" t))))

  (find-file "junk.c")

  (mark-whole-buffer)

  (setq debug-on-error t)

  (c-indent-line-or-region))

command line

--------------------

emacs -q -l bug.el -f bugtest

debugger output

------------------------

 Debugger entered--Lisp error: (scan-error "Unbalanced parentheses" 13 1)
  scan-lists(13 -1 1)
  up-list(-1)
  backward-up-list(1)
  c-beginning-of-statement-1(1)
  c-guess-basic-syntax()
  c-indent-line(nil t)
  c-indent-region(1 42)
  c-indent-line-or-region()
  bugtest()
  command-line-1(("-l" "bug.el" "-f" "bugtest"))
  command-line()

  normal-top-level()