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;;; cc-cmds.el --- user level commands for CC Mode
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;; Copyright (C) 1985,1987,1992-2001 Free Software Foundation, Inc.
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;; Authors:    2000- Martin Stjernholm
;;	       1998-1999 Barry A. Warsaw and Martin Stjernholm
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;;             1992-1997 Barry A. Warsaw
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;;             1987 Dave Detlefs and Stewart Clamen
;;             1985 Richard M. Stallman
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;; Maintainer: bug-cc-mode@gnu.org
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;; Created:    22-Apr-1997 (split from cc-mode.el)
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;; Version:    See cc-mode.el
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;; Keywords:   c languages oop

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
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;; along with this program; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.

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;;; Commentary:

;;; Code:

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(eval-when-compile
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  (let ((load-path
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	 (if (and (boundp 'byte-compile-dest-file)
		  (stringp byte-compile-dest-file))
	     (cons (file-name-directory byte-compile-dest-file) load-path)
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	   load-path)))
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    (require 'cc-bytecomp)))

(cc-require 'cc-defs)
(cc-require 'cc-vars)
(cc-require 'cc-langs)
(cc-require 'cc-engine)

;; Silence the compiler.
(cc-bytecomp-defvar delete-key-deletes-forward) ; XEmacs 20+
(cc-bytecomp-defun delete-forward-p)	; XEmacs 21+
(cc-bytecomp-obsolete-fun insert-and-inherit) ; Marked obsolete in XEmacs 19
(cc-bytecomp-defvar filladapt-mode)	; c-fill-paragraph contains a kludge
					; which looks at this.
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(defun c-calculate-state (arg prevstate)
  ;; Calculate the new state of PREVSTATE, t or nil, based on arg. If
  ;; arg is nil or zero, toggle the state. If arg is negative, turn
  ;; the state off, and if arg is positive, turn the state on
  (if (or (not arg)
	  (zerop (setq arg (prefix-numeric-value arg))))
      (not prevstate)
    (> arg 0)))

;; Auto-newline and hungry-delete
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(defun c-toggle-auto-state (&optional arg)
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  "Toggle auto-newline feature.
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Optional numeric ARG, if supplied, turns on auto-newline when
positive, turns it off when negative, and just toggles it when zero or
left out.
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When the auto-newline feature is enabled (as evidenced by the `/a' or
`/ah' on the modeline after the mode name) newlines are automatically
inserted after special characters such as brace, comma, semi-colon,
and colon."
  (interactive "P")
  (setq c-auto-newline (c-calculate-state arg c-auto-newline))
  (c-update-modeline)
  (c-keep-region-active))

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(defun c-toggle-hungry-state (&optional arg)
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  "Toggle hungry-delete-key feature.
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Optional numeric ARG, if supplied, turns on hungry-delete when
positive, turns it off when negative, and just toggles it when zero or
left out.
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When the hungry-delete-key feature is enabled (as evidenced by the
`/h' or `/ah' on the modeline after the mode name) the delete key
gobbles all preceding whitespace in one fell swoop."
  (interactive "P")
  (setq c-hungry-delete-key (c-calculate-state arg c-hungry-delete-key))
  (c-update-modeline)
  (c-keep-region-active))

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(defun c-toggle-auto-hungry-state (&optional arg)
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  "Toggle auto-newline and hungry-delete-key features.
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Optional numeric ARG, if supplied, turns on auto-newline and
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hungry-delete when positive, turns them off when negative, and just
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toggles them when zero or left out.
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See `c-toggle-auto-state' and `c-toggle-hungry-state' for details."
  (interactive "P")
  (setq c-auto-newline (c-calculate-state arg c-auto-newline))
  (setq c-hungry-delete-key (c-calculate-state arg c-hungry-delete-key))
  (c-update-modeline)
  (c-keep-region-active))


;; Electric keys

(defun c-electric-backspace (arg)
  "Deletes preceding character or whitespace.
If `c-hungry-delete-key' is non-nil, as evidenced by the \"/h\" or
\"/ah\" string on the mode line, then all preceding whitespace is
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consumed.  If however a prefix argument is supplied, or
`c-hungry-delete-key' is nil, or point is inside a literal then the
function in the variable `c-backspace-function' is called.
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See also \\[c-electric-delete]."
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  (interactive "*P")
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  (if (or (not c-hungry-delete-key)
	  arg
	  (c-in-literal))
      (funcall c-backspace-function (prefix-numeric-value arg))
    (let ((here (point)))
      (skip-chars-backward " \t\n")
      (if (/= (point) here)
	  (delete-region (point) here)
	(funcall c-backspace-function 1)
	))))

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(defun c-electric-delete-forward (arg)
  "Deletes following character or whitespace.
If `c-hungry-delete-key' is non-nil, as evidenced by the \"/h\" or
\"/ah\" string on the mode line, then all following whitespace is
consumed.  If however a prefix argument is supplied, or
`c-hungry-delete-key' is nil, or point is inside a literal then the
function in the variable `c-delete-function' is called."
  (interactive "*P")
  (if (or (not c-hungry-delete-key)
	  arg
	  (c-in-literal))
      (funcall c-delete-function (prefix-numeric-value arg))
    (let ((here (point)))
      (skip-chars-forward " \t\n")
      (if (/= (point) here)
	  (delete-region (point) here)
	(funcall c-delete-function 1)))))

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(defun c-electric-delete (arg)
  "Deletes preceding or following character or whitespace.
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This function either deletes forward as `c-electric-delete-forward' or
backward as `c-electric-backspace', depending on the configuration:

If the function `delete-forward-p' is defined (XEmacs 21) and returns
non-nil, it deletes forward.  Else, if the variable
`delete-key-deletes-forward' is defined (XEmacs 20) and is set to
non-nil, it deletes forward.  Otherwise it deletes backward.

Note: This is the way in XEmacs 20 and later to choose the correct
action for the [delete] key, whichever key that means.  In other
flavors this function isn't used, instead it's left to the user to
bind [delete] to either \\[c-electric-delete-forward] or \\[c-electric-backspace] as appropriate
\(the keymap `function-key-map' is useful for that).  Emacs 21 handles
that automatically, though."
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  (interactive "*P")
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  (if (or (and (fboundp 'delete-forward-p) ;XEmacs 21
	       (delete-forward-p))
	  (and (boundp 'delete-key-deletes-forward) ;XEmacs 20
	       delete-key-deletes-forward))
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      (c-electric-delete-forward arg)
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    (c-electric-backspace arg)))

(defun c-electric-pound (arg)
  "Electric pound (`#') insertion.
Inserts a `#' character specially depending on the variable
`c-electric-pound-behavior'.  If a numeric ARG is supplied, or if
point is inside a literal, nothing special happens."
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  (interactive "*P")
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  (if (or arg
	  (not (memq 'alignleft c-electric-pound-behavior))
	  (save-excursion (skip-chars-backward " \t") (not (bolp)))
	  (c-in-literal))
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      ;; do nothing special
      (self-insert-command (prefix-numeric-value arg))
    ;; place the pound character at the left edge
    (let ((pos (- (point-max) (point)))
	  (bolp (bolp)))
      (beginning-of-line)
      (delete-horizontal-space)
      (insert-char last-command-char 1)
      (and (not bolp)
	   (goto-char (- (point-max) pos)))
      )))

(defun c-electric-brace (arg)
  "Insert a brace.

If the auto-newline feature is turned on, as evidenced by the \"/a\"
or \"/ah\" string on the mode line, newlines are inserted before and
after braces based on the value of `c-hanging-braces-alist'.

Also, the line is re-indented unless a numeric ARG is supplied, there
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are non-whitespace characters present on the line after the brace, the
brace is inserted inside a literal, or `c-syntactic-indentation' is
nil.
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This function does various newline cleanups based on the value of
`c-cleanup-list'."
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  (interactive "*P")
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  (let* ((c-state-cache (c-parse-state))
	 (safepos (c-safe-position (point) c-state-cache))
	 (literal (c-in-literal safepos)))
    ;; if we're in a literal, or we're not at the end of the line, or
    ;; a numeric arg is provided, or auto-newlining is turned off,
    ;; then just insert the character.
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    (if (or literal
	    arg
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	    (not (looking-at "[ \t]*$")))
	(self-insert-command (prefix-numeric-value arg))
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      (let* ((syms
	      ;; This is the list of brace syntactic symbols that can
	      ;; hang.  If any new ones are added to c-offsets-alist,
	      ;; they should be added here as well.
	      '(class-open class-close defun-open defun-close
		inline-open inline-close
		brace-list-open brace-list-close
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		brace-list-intro brace-entry-open
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		block-open block-close
		substatement-open statement-case-open
		extern-lang-open extern-lang-close
		namespace-open namespace-close
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		inexpr-class-open inexpr-class-close
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		))
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	    ;; we want to inhibit blinking the paren since this will
	    ;; be most disruptive. we'll blink it ourselves later on
	    (old-blink-paren blink-paren-function)
	    blink-paren-function
	    (insertion-point (point))
	    delete-temp-newline
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	    (preserve-p (and (not (bobp))
			     (eq ?\  (char-syntax (char-before)))))
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	    ;; shut this up too
	    (c-echo-syntactic-information-p nil)
	    (syntax (progn
		      ;; only insert a newline if there is
		      ;; non-whitespace behind us
		      (if (save-excursion
			    (skip-chars-backward " \t")
			    (not (bolp)))
			  (progn (newline)
				 (setq delete-temp-newline t)))
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		      (if (eq last-command-char ?{)
			  (setq c-state-cache (cons (point) c-state-cache)))
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		      (self-insert-command (prefix-numeric-value arg))
		      ;; state cache doesn't change
		      (c-guess-basic-syntax)))
	    (newlines (and
		       c-auto-newline
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		       (or (c-lookup-lists
			    syms
			    ;; Substitute inexpr-class and class-open
			    ;; or class-close with inexpr-class-open
			    ;; or inexpr-class-close.
			    (if (assq 'inexpr-class syntax)
				(cond ((assq 'class-open syntax)
				       '((inexpr-class-open)))
				      ((assq 'class-close syntax)
				       '((inexpr-class-close)))
				      (t syntax))
			      syntax)
			    c-hanging-braces-alist)
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			   '(ignore before after)))))
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	;; Do not try to insert newlines around a special (Pike-style)
	;; brace list.
	(if (and c-special-brace-lists
		 (save-excursion
		   (c-safe (if (= (char-before) ?{)
			       (forward-char -1)
			     (c-forward-sexp -1))
			   (c-looking-at-special-brace-list))))
	    (setq newlines nil))
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	;; If syntax is a function symbol, then call it using the
	;; defined semantics.
	(if (and (not (consp (cdr newlines)))
		 (functionp (cdr newlines)))
	    (let ((c-syntactic-context syntax))
	      (setq newlines
		    (funcall (cdr newlines) (car newlines) insertion-point))))
	;; does a newline go before the open brace?
	(if (memq 'before newlines)
	    ;; we leave the newline we've put in there before,
	    ;; but we need to re-indent the line above
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	    (let (old-ind
		  (old-point-max (point-max))
		  (pos (- (point-max) (point)))
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		  (here (point)))
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	      (forward-line -1)
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	      (setq old-ind (c-point 'boi))
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	      (let ((c-state-cache (c-whack-state (point) c-state-cache)))
		;; we may need to update the cache. this should
		;; still be faster than recalculating the state
		;; in many cases
		(save-excursion
		  (save-restriction
		    (narrow-to-region here (point))
		    (if (and (c-safe (progn (backward-up-list -1) t))
			     (memq (char-before) '(?\) ?}))
			     (progn (widen)
				    (c-safe (progn (c-forward-sexp -1)
						   t))))
			(setq c-state-cache
			      (c-hack-state (point) 'open c-state-cache)))))
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		(if c-syntactic-indentation
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		    (indent-according-to-mode)))
	      (setq c-state-cache (c-adjust-state (c-point 'bol) old-point-max
						  (- (c-point 'boi) old-ind)
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						  c-state-cache))
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	      (goto-char (- (point-max) pos))
	      ;; if the buffer has changed due to the indentation, we
	      ;; need to recalculate syntax for the current line, but
	      ;; we won't need to update the state cache.
	      (if (/= (point) here)
		  (setq syntax (c-guess-basic-syntax))))
	  ;; must remove the newline we just stuck in (if we really did it)
	  (and delete-temp-newline
	       (save-excursion
		 ;; if there is whitespace before point, then preserve
		 ;; at least one space.
		 (delete-indentation)
		 (just-one-space)
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		 (setq c-state-cache (c-whack-state (point) c-state-cache))
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		 (if (not preserve-p)
		     (delete-char -1))))
	  ;; since we're hanging the brace, we need to recalculate
	  ;; syntax.  Update the state to accurately reflect the
	  ;; beginning of the line.  We punt if we cross any open or
	  ;; closed parens because its just too hard to modify the
	  ;; known state.  This limitation will be fixed in v5.
	  (save-excursion
	    (let ((bol (c-point 'bol)))
	      (if (zerop (car (parse-partial-sexp bol (1- (point)))))
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		  (setq syntax (c-guess-basic-syntax))
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		;; gotta punt. this requires some horrible kludgery
		(beginning-of-line)
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		(setq c-state-cache nil
		      c-state-cache (c-parse-state)
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		      syntax nil))))
	  )
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	;; Now adjust the line's indentation.  Don't update the state
	;; cache since c-guess-basic-syntax isn't called when
	;; c-syntactic-context is set.
	(let* ((old-ind (c-point 'boi))
	       (old-point-max (point-max))
	       (c-syntactic-context syntax))
	  (indent-according-to-mode)
	  (setq c-state-cache (c-adjust-state (c-point 'bol) old-point-max
					      (- (c-point 'boi) old-ind)
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					      c-state-cache)))
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	;; Do all appropriate clean ups
	(let ((here (point))
	      (pos (- (point-max) (point)))
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	      mbeg mend tmp)
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	  ;; clean up empty defun braces
	  (if (and c-auto-newline
		   (memq 'empty-defun-braces c-cleanup-list)
		   (eq last-command-char ?\})
		   (c-intersect-lists '(defun-close class-close inline-close)
				      syntax)
		   (progn
		     (forward-char -1)
		     (skip-chars-backward " \t\n")
		     (eq (char-before) ?\{))
		   ;; make sure matching open brace isn't in a comment
		   (not (c-in-literal)))
	      (delete-region (point) (1- here)))
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	  ;; clean up brace-else-brace and brace-elseif-brace
	  (when (and c-auto-newline
		     (eq last-command-char ?\{)
		     (not (c-in-literal)))
	    (cond
	     ((and (memq 'brace-else-brace c-cleanup-list)
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		   (re-search-backward "}[ \t\n]*else[ \t\n]*{" nil t)
		   (progn
		     (setq mbeg (match-beginning 0)
			   mend (match-end 0))
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		     (eq (match-end 0) here)))
	      (delete-region mbeg mend)
	      (insert "} else {"))
	     ((and (memq 'brace-elseif-brace c-cleanup-list)
		   (progn
		     (goto-char (1- here))
		     (setq mend (point))
		     (skip-chars-backward " \t\n")
		     (setq mbeg (point))
		     (eq (char-before) ?\)))
		   (= (c-backward-token-1 1 t) 0)
		   (eq (char-after) ?\()
		   (progn
		     (setq tmp (point))
		     (re-search-backward "}[ \t\n]*else[ \t\n]+if[ \t\n]*"
					 nil t))
		   (eq (match-end 0) tmp))
	      (delete-region mbeg mend)
	      (goto-char mbeg)
	      (insert " "))))
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	  (goto-char (- (point-max) pos))
	  )
	;; does a newline go after the brace?
	(if (memq 'after newlines)
	    (progn
	      (newline)
	      ;; update on c-state-cache
	      (let* ((bufpos (- (point) 2))
		     (which (if (eq (char-after bufpos) ?{) 'open 'close))
		     (c-state-cache (c-hack-state bufpos which c-state-cache)))
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		(indent-according-to-mode))))
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	;; blink the paren
	(and (eq last-command-char ?\})
	     old-blink-paren
	     (save-excursion
	       (c-backward-syntactic-ws safepos)
	       (funcall old-blink-paren)))
	))))
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(defun c-electric-slash (arg)
  "Insert a slash character.
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Indent the line as a comment, if:

  1. The slash is second of a `//' line oriented comment introducing
     token and we are on a comment-only-line, or

  2. The slash is part of a `*/' token that closes a block oriented
     comment.

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If a numeric ARG is supplied, point is inside a literal, or
`c-syntactic-indentation' is nil, indentation is inhibited."
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  (interactive "*P")
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  (let* ((ch (char-before))
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	 (indentp (and c-syntactic-indentation
		       (not arg)
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		       (eq last-command-char ?/)
		       (or (and (eq ch ?/)
				(not (c-in-literal)))
			   (and (eq ch ?*)
				(c-in-literal)))
		       ))
	 ;; shut this up
	 (c-echo-syntactic-information-p nil))
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    (self-insert-command (prefix-numeric-value arg))
    (if indentp
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	(indent-according-to-mode))))
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(defun c-electric-star (arg)
  "Insert a star character.
If the star is the second character of a C style comment introducing
construct, and we are on a comment-only-line, indent line as comment.
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If a numeric ARG is supplied, point is inside a literal, or
`c-syntactic-indentation' is nil, indentation is inhibited."
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  (interactive "*P")
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  (self-insert-command (prefix-numeric-value arg))
  ;; if we are in a literal, or if arg is given do not re-indent the
  ;; current line, unless this star introduces a comment-only line.
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  (if (and c-syntactic-indentation
	   (not arg)
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	   (memq (c-in-literal) '(c))
	   (eq (char-before) ?*)
	   (save-excursion
	     (forward-char -1)
	     (skip-chars-backward "*")
	     (if (eq (char-before) ?/)
		 (forward-char -1))
	     (skip-chars-backward " \t")
	     (bolp)))
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      (let (c-echo-syntactic-information-p) ; shut this up
	(indent-according-to-mode))
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    ))

(defun c-electric-semi&comma (arg)
  "Insert a comma or semicolon.
When the auto-newline feature is turned on, as evidenced by the \"/a\"
or \"/ah\" string on the mode line, a newline might be inserted.  See
the variable `c-hanging-semi&comma-criteria' for how newline insertion
is determined.

When semicolon is inserted, the line is re-indented unless a numeric
arg is supplied, point is inside a literal, or there are
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non-whitespace characters on the line following the semicolon, or
`c-syntactic-indentation' is nil.
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Based on the value of `c-cleanup-list', this function cleans up commas
following brace lists and semicolons following defuns."
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  (interactive "*P")
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  (let* ((lim (c-most-enclosing-brace (c-parse-state)))
	 (literal (c-in-literal lim))
	 (here (point))
	 ;; shut this up
	 (c-echo-syntactic-information-p nil))
    (if (or literal
	    arg
	    (not (looking-at "[ \t]*$")))
	(self-insert-command (prefix-numeric-value arg))
      ;; do some special stuff with the character
      (self-insert-command (prefix-numeric-value arg))
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      ;; do all cleanups and newline insertions if c-auto-newline is
      ;; turned on
      (if (not c-auto-newline)
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	  (if c-syntactic-indentation
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	      (indent-according-to-mode))
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	;; clean ups
	(let ((pos (- (point-max) (point))))
	  (if (and (or (and
			(eq last-command-char ?,)
			(memq 'list-close-comma c-cleanup-list))
		       (and
			(eq last-command-char ?\;)
			(memq 'defun-close-semi c-cleanup-list)))
		   (progn
		     (forward-char -1)
		     (skip-chars-backward " \t\n")
		     (eq (char-before) ?}))
		   ;; make sure matching open brace isn't in a comment
		   (not (c-in-literal lim)))
	      (delete-region (point) here))
	  (goto-char (- (point-max) pos)))
	;; re-indent line
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	(if c-syntactic-indentation
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	    (indent-according-to-mode))
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	;; check to see if a newline should be added
	(let ((criteria c-hanging-semi&comma-criteria)
	      answer add-newline-p)
	  (while criteria
	    (setq answer (funcall (car criteria)))
	    ;; only nil value means continue checking
	    (if (not answer)
		(setq criteria (cdr criteria))
	      (setq criteria nil)
	      ;; only 'stop specifically says do not add a newline
	      (setq add-newline-p (not (eq answer 'stop)))
	      ))
	  (if add-newline-p
	      (progn (newline)
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		     (indent-according-to-mode)))
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	  )))))

(defun c-electric-colon (arg)
  "Insert a colon.

If the auto-newline feature is turned on, as evidenced by the \"/a\"
or \"/ah\" string on the mode line, newlines are inserted before and
after colons based on the value of `c-hanging-colons-alist'.

Also, the line is re-indented unless a numeric ARG is supplied, there
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are non-whitespace characters present on the line after the colon, the
colon is inserted inside a literal, or `c-syntactic-indentation' is
nil.
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This function cleans up double colon scope operators based on the
value of `c-cleanup-list'."
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  (interactive "*P")
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  (let* ((bod (c-point 'bod))
	 (literal (c-in-literal bod))
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	 syntax newlines is-scope-op
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	 ;; shut this up
	 (c-echo-syntactic-information-p nil))
    (if (or literal
	    arg
	    (not (looking-at "[ \t]*$")))
	(self-insert-command (prefix-numeric-value arg))
      ;; insert the colon, then do any specified cleanups
      (self-insert-command (prefix-numeric-value arg))
      (let ((pos (- (point-max) (point)))
	    (here (point)))
	(if (and c-auto-newline
		 (memq 'scope-operator c-cleanup-list)
		 (eq (char-before) ?:)
		 (progn
		   (forward-char -1)
		   (skip-chars-backward " \t\n")
		   (eq (char-before) ?:))
		 (not (c-in-literal))
		 (not (eq (char-after (- (point) 2)) ?:)))
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	    (progn
	      (delete-region (point) (1- here))
	      (setq is-scope-op t)))
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	(goto-char (- (point-max) pos)))
      ;; lets do some special stuff with the colon character
      (setq syntax (c-guess-basic-syntax)
	    ;; some language elements can only be determined by
	    ;; checking the following line.  Lets first look for ones
	    ;; that can be found when looking on the line with the
	    ;; colon
	    newlines
	    (and c-auto-newline
		 (or (c-lookup-lists '(case-label label access-label)
				     syntax c-hanging-colons-alist)
		     (c-lookup-lists '(member-init-intro inher-intro)
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				     (let ((buffer-undo-list t))
				       (insert "\n")
				       (unwind-protect
					   (c-guess-basic-syntax)
					 (delete-char -1)))
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				     c-hanging-colons-alist))))
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      ;; indent the current line if it's done syntactically.
      (if c-syntactic-indentation
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	  (let ((c-syntactic-context syntax))
	    (indent-according-to-mode)))
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      ;; does a newline go before the colon?  Watch out for already
      ;; non-hung colons.  However, we don't unhang them because that
      ;; would be a cleanup (and anti-social).
      (if (and (memq 'before newlines)
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	       (not is-scope-op)
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	       (save-excursion
		 (skip-chars-backward ": \t")
		 (not (bolp))))
	  (let ((pos (- (point-max) (point))))
	    (forward-char -1)
	    (newline)
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	    (indent-according-to-mode)
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	    (goto-char (- (point-max) pos))))
      ;; does a newline go after the colon?
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      (if (and (memq 'after (cdr-safe newlines))
	       (not is-scope-op))
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	  (progn
	    (newline)
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	    (indent-according-to-mode)))
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      )))

(defun c-electric-lt-gt (arg)
  "Insert a less-than, or greater-than character.
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The line will be re-indented if the character inserted is the second
of a C++ style stream operator and the buffer is in C++ mode.
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Exceptions are when a numeric argument is supplied, point is inside a
literal, or `c-syntactic-indentation' is nil, in which case the line
will not be re-indented."
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  (interactive "*P")
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  (let ((indentp (and c-syntactic-indentation
		      (not arg)
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		      (eq (char-before) last-command-char)
		      (not (c-in-literal))))
	;; shut this up
	(c-echo-syntactic-information-p nil))
    (self-insert-command (prefix-numeric-value arg))
    (if indentp
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	(indent-according-to-mode))))
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(defun c-electric-paren (arg)
  "Insert a parenthesis.

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Some newline cleanups are done if appropriate; see the variable
`c-cleanup-list'.
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Also, the line is re-indented unless a numeric ARG is supplied, there
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are non-whitespace characters present on the line after the
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parenthesis, the parenthesis is inserted inside a literal, or
`c-syntactic-indentation' is nil."
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  (interactive "*P")
  (let (;; shut this up
	(c-echo-syntactic-information-p nil))
    (if (or arg
	    (c-in-literal (c-point 'bod)))
	(self-insert-command (prefix-numeric-value arg))
      ;; do some special stuff with the character
      (let* (;; We want to inhibit blinking the paren since this will
	     ;; be most disruptive.  We'll blink it ourselves
	     ;; afterwards.
	     (old-blink-paren blink-paren-function)
	     blink-paren-function)
	(self-insert-command (prefix-numeric-value arg))
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	(when (looking-at "[ \t]*$")
	  (if c-syntactic-indentation
	      (indent-according-to-mode))
	  (when c-auto-newline
	    ;; Do all appropriate clean ups
	    (let ((here (point))
		  (pos (- (point-max) (point)))
		  mbeg mend)
	      ;; clean up brace-elseif-brace
	      (if (and (memq 'brace-elseif-brace c-cleanup-list)
		       (eq last-command-char ?\()
		       (re-search-backward "}[ \t\n]*else[ \t\n]+if[ \t\n]*("
					   nil t)
		       (save-excursion
			 (setq mbeg (match-beginning 0)
			       mend (match-end 0))
			 (= mend here))
		       (not (c-in-literal)))
		  (progn
		    (delete-region mbeg mend)
		    (insert "} else if (")))
	      ;; clean up brace-catch-brace
	      (if (and (memq 'brace-catch-brace c-cleanup-list)
		       (eq last-command-char ?\()
		       (re-search-backward "}[ \t\n]*catch[ \t\n]*(" nil t)
		       (save-excursion
			 (setq mbeg (match-beginning 0)
			       mend (match-end 0))
			 (= mend here))
		       (not (c-in-literal)))
		  (progn
		    (delete-region mbeg mend)
		    (insert "} catch (")))
	      (goto-char (- (point-max) pos))
	      )))
	(let (beg (end (1- (point))))
	  (cond ((and (memq 'space-before-funcall c-cleanup-list)
		      (eq last-command-char ?\()
		      (save-excursion
			(backward-char)
			(skip-chars-backward " \t")
			(setq beg (point))
			(c-on-identifier)))
		 (save-excursion
		   (delete-region beg end)
		   (goto-char beg)
		   (insert " ")))
		((and (memq 'compact-empty-funcall c-cleanup-list)
		      (eq last-command-char ?\))
		      (save-excursion
			(c-safe (backward-char 2))
			(when (looking-at "()")
			  (setq end (point))
			  (skip-chars-backward " \t")
			  (setq beg (point))
			  (c-on-identifier))))
		 (delete-region beg end))))
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	(if old-blink-paren
	    (funcall old-blink-paren))))))
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(defun c-electric-continued-statement ()
  "Reindent the current line if appropriate.

This function is used to reindent the line after a keyword which
continues an earlier statement is typed, e.g. an \"else\" or the
\"while\" in a do-while block.

The line is reindented if there is nothing but whitespace before the
keyword on the line, the keyword is not inserted inside a literal, and
`c-syntactic-indentation' is non-nil."
  (let (;; shut this up
	(c-echo-syntactic-information-p nil))
    (when (and c-syntactic-indentation
	       (not (eq last-command-char ?_))
	       (= (save-excursion
		    (skip-syntax-backward "w")
		    (point))
		  (c-point 'boi))
	       (not (c-in-literal (c-point 'bod))))
      (indent-according-to-mode))))
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;; better movement routines for ThisStyleOfVariablesCommonInCPlusPlus
;; originally contributed by Terry_Glanfield.Southern@rxuk.xerox.com
(defun c-forward-into-nomenclature (&optional arg)
  "Move forward to end of a nomenclature section or word.
With arg, to it arg times."
  (interactive "p")
  (let ((case-fold-search nil))
    (if (> arg 0)
	(re-search-forward "\\W*\\([A-Z]*[a-z0-9]*\\)" (point-max) t arg)
      (while (and (< arg 0)
		  (re-search-backward
		   "\\(\\(\\W\\|[a-z0-9]\\)[A-Z]+\\|\\W\\w+\\)"
		   (point-min) 0))
	(forward-char 1)
	(setq arg (1+ arg)))))
  (c-keep-region-active))

(defun c-backward-into-nomenclature (&optional arg)
  "Move backward to beginning of a nomenclature section or word.
With optional ARG, move that many times.  If ARG is negative, move
forward."
  (interactive "p")
  (c-forward-into-nomenclature (- arg))
  (c-keep-region-active))

(defun c-scope-operator ()
  "Insert a double colon scope operator at point.
No indentation or other \"electric\" behavior is performed."
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  (interactive "*")
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  (insert "::"))

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(defun c-beginning-of-defun (&optional arg)
  "Move backward to the beginning of a defun.
With argument, do it that many times.  Negative arg -N
means move forward to Nth following beginning of defun.
Returns t unless search stops due to beginning or end of buffer.

Unlike the built-in `beginning-of-defun' this tries to be smarter
about finding the char with open-parenthesis syntax that starts the
defun."
  (interactive "p")
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  (unless arg (setq arg 1))
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  (if (< arg 0)
      (c-end-of-defun (- arg))
    (while (> arg 0)
      (let ((state (nreverse (c-parse-state)))
	    prevbod bod)
	(while (and state (not bod))
	  (setq bod (car state)
		state (cdr state))
	  (if (consp bod)
	      (setq prevbod (car bod)
		    bod nil)))
	(cond
	 (bod (goto-char bod))
	 (prevbod (goto-char prevbod))
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	 (t (goto-char (point-min))
	    (setq arg 0)))
	(setq arg (1- arg))))
    (c-keep-region-active)
    (= arg 0)))
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(defun c-end-of-defun (&optional arg)
  "Move forward to next end of defun.  With argument, do it that many times.
Negative argument -N means move back to Nth preceding end of defun.
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Returns t unless search stops due to beginning or end of buffer.
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An end of a defun occurs right after the close-parenthesis that matches
the open-parenthesis that starts a defun; see `beginning-of-defun'."
  (interactive "p")
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  (if (not arg)
      (setq arg 1))
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  (if (< arg 0)
      (c-beginning-of-defun (- arg))
    (while (> arg 0)
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      (let ((pos (point))
	    eol)
	(while (and (c-safe (down-list 1) t)
		    (not (eq (char-before) ?{)))
	  ;; skip down into the next defun-block
	  (forward-char -1)
	  (c-forward-sexp))
	(c-beginning-of-defun 1)
	(setq eol (c-point 'eol))
	(c-forward-sexp)
	(if (< eol (point))
	    ;; Don't move to next line for one line defuns.
	    (forward-line 1))
	(when (<= (point) pos)
	  (goto-char (point-max))
	  (setq arg 0))
	(setq arg (1- arg))))
    (c-keep-region-active)
    (= arg 0)))
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(defun c-beginning-of-statement (&optional count lim sentence-flag)
  "Go to the beginning of the innermost C statement.
With prefix arg, go back N - 1 statements.  If already at the
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beginning of a statement then go to the beginning of the closest
preceding one, moving into nested blocks if necessary (use
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\\[backward-sexp] to skip over a block).  If within or next to a
comment or multiline string, move by sentences instead of statements.
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When called from a program, this function takes 3 optional args: the
repetition count, a buffer position limit which is the farthest back
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to search for the syntactic context, and a flag saying whether to do
sentence motion in or near comments and multiline strings."
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  (interactive (list (prefix-numeric-value current-prefix-arg)
		     nil t))
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  (let* ((count (or count 1))
	 here
	 (range (c-collect-line-comments (c-literal-limits lim))))
    (while (and (/= count 0)
		(or (not lim) (> (point) lim)))
      (setq here (point))
      (if (and (not range) sentence-flag)
	  (save-excursion
	    ;; Find the comment next to point if we're not in one.
	    (if (> count 0)
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		(if (c-forward-comment -1)
		    (setq range (cons (point)
				      (progn (c-forward-comment 1) (point))))
		  (skip-chars-backward " \t\n\r\f")
		  (setq range (point))
		  (setq range
			(if (eq (char-before) ?\")
			    (c-safe (c-backward-sexp 1)
				    (cons (point) range)))))
	      ;; skip-syntax-* doesn't count \n as whitespace..
	      (skip-chars-forward " \t\n\r\f")
	      (if (eq (char-after) ?\")
		  (setq range (cons (point)
				    (progn
				      (c-forward-sexp 1)
				      (point))))
		(setq range (point))
		(setq range (if (c-forward-comment 1)
				(cons range (point))
			      nil))))
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	    (setq range (c-collect-line-comments range))))
      (if (and (< count 0) (= here (point-max)))
	  ;; Special case because eob might be in a literal.
	  (setq range nil))
      (if range
	  (if (and sentence-flag
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		   (or (/= (char-syntax (char-after (car range))) ?\")
		       ;; Only visit a string if it spans more than one line.
		       (save-excursion
			 (goto-char (car range))
			 (skip-chars-forward "^\n" (cdr range))
			 (< (point) (cdr range)))))
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	      (let* ((lit-type (c-literal-type range))
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		     (line-prefix (concat "[ \t]*\\("
					  c-current-comment-prefix
					  "\\)[ \t]*"))
		     (beg (if (eq lit-type 'string)
			      (1+ (car range))
			    (save-excursion
			      (goto-char (car range))
			      (max (progn
				     (looking-at comment-start-skip)
				     (match-end 0))
				   (progn
				     (looking-at line-prefix)
				     (match-end 0))))))
		     (end (- (cdr range) (if (eq lit-type 'c) 2 1)))
		     (beg-of-para (if (eq lit-type 'string)
				      (lambda ())
				    (lambda ()
				      (beginning-of-line)
				      (if (looking-at line-prefix)
					  (goto-char (match-end 0)))))))
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		(save-restriction
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		  ;; Move by sentence, but not past the limit of the
		  ;; literal, narrowed to the appropriate
		  ;; paragraph(s).
		  (narrow-to-region (save-excursion
				      (let ((pos (min here end)))
					(goto-char pos)
					(forward-paragraph -1)
					(if (looking-at paragraph-separate)
					    (forward-line))
					(when (> (point) beg)
					  (funcall beg-of-para)
					  (when (>= (point) pos)
					    (forward-paragraph -2)
					    (funcall beg-of-para)))
					(max (point) beg)))
				    end)
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		  (c-safe (forward-sentence (if (< count 0) 1 -1)))
		  (if (and (memq lit-type '(c c++))
			   ;; Check if we stopped due to a comment
			   ;; prefix and not a sentence end.
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			   (/= (point) (point-min))
			   (/= (point) (point-max))
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			   (save-excursion
			     (beginning-of-line)
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			     (looking-at line-prefix))
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			   (>= (point) (match-beginning 0))
			   (/= (match-beginning 1) (match-end 1))
			   (or (< (point) (match-end 0))
			       (and
				(= (point) (match-end 0))
				;; The comment prefix may contain
				;; characters that is regarded as end
				;; of sentence.
				(or (eolp)
				    (and
				     (save-excursion
				       (forward-paragraph -1)
				       (< (point) (match-beginning 0)))
				     (save-excursion
				       (beginning-of-line)
				       (or (not (re-search-backward
						 sentence-end
						 (c-point 'bopl)
						 t))
					   (< (match-end 0)
					      (c-point 'eol)))))))))
		      (setq count (+ count (if (< count 0) -1 1)))
		    (if (< count 0)
			(progn
			  ;; In block comments, if there's only
			  ;; horizontal ws between the text and the
			  ;; comment ender, stop before it.  Stop after
			  ;; the ender if there's either nothing or
			  ;; newlines between.
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			  (when (and (eq lit-type 'c)
				     (eq (point) (point-max)))
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			    (widen)
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			    (when (or (= (skip-chars-backward " \t") 0)
				      (eq (point) (point-max))
				      (bolp))
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			      (goto-char (cdr range)))))
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		      (when (and (eq (point) (point-min))
				 (looking-at "[ \t]*$"))
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			;; Stop before instead of after the comment
			;; starter if nothing follows it.
			(widen)
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			(goto-char (car range))
			(if (and (eq lit-type 'string) (/= (point) here))
			    (setq count (1+ count)
				  range nil))))))
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		;; See if we should escape the literal.
		(if (> count 0)
		    (if (< (point) here)
			(setq count (1- count))
		      (goto-char (car range))
		      (setq range nil))
		  (if (> (point) here)
		      (setq count (1+ count))
		    (goto-char (cdr range))
		    (setq range nil))))
	    (goto-char (if (> count 0) (car range) (cdr range)))
	    (setq range nil))
	;; Below we do approximately the same as
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	;; c-beginning-of-statement-1 and c-end-of-statement-1, and
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	;; perhaps they should be changed, but that'd likely break a
	;; lot in cc-engine.
	(goto-char here)
	(if (> count 0)
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	    (condition-case nil
		;; Stop before `{' and after `;', `{', `}' and `};'
		;; when not followed by `}' or `)', but on the other
		;; side of the syntactic ws.  Move by sexps and move
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		;; into parens.  Also stop before `#' when it's at boi
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		;; on a line.
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		(let ((literal-pos (not sentence-flag))
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		      (large-enough (- (point-max)))
		      last last-below-line)
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		  (catch 'done
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		    (while t
		      (setq last (point))
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		      (when (and (or (eq (char-after) ?\{)
				     (and (eq (char-after) ?#)
					  (eq (point) (c-point 'boi)))
				     )
				 (/= here last))
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			(unless (and c-special-brace-lists
				     (eq (char-after) ?{)
				     (c-looking-at-special-brace-list))
			  (if (and (eq (char-after) ?#)
				   (numberp last-below-line)
				   (not (eq last-below-line here)))
			      (goto-char last-below-line))
			  (throw 'done t)))
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		      (if literal-pos
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			  (c-forward-comment large-enough)
			(when (c-forward-comment -1)
			  ;; Record position of first comment.
			  (save-excursion
			    (c-forward-comment 1)
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			    (setq literal-pos (point)))
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			  (c-forward-comment large-enough)))
		      (unless last-below-line
			(if (save-excursion
			      (re-search-forward "\\(^\\|[^\\]\\)$" last t))
			    (setq last-below-line last)))
		      (cond ((bobp)	; Must handle bob specially.
			     (if (= here last)
				 (throw 'done t)
			       (goto-char last)
			       (throw 'done t)))
			    ((progn (backward-char)
				    (looking-at "[;{}]"))
			     (if (and c-special-brace-lists
				      (eq (char-after) ?{)
				      (c-looking-at-special-brace-list))
				 (skip-syntax-backward "w_") ; Speedup only.
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			       (if (or (= here last)
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				       (memq (char-after last) '(?\) ?})))
				   (if (and (eq (char-before) ?})
					    (eq (char-after) ?\;))
				       (backward-char))
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				 (goto-char last)
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				 (throw 'done t))))
			    ((= (char-syntax (char-after)) ?\")
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			     (let ((end (point)))
			       (forward-char)
			       (c-backward-sexp)
			       (save-excursion
				 (skip-chars-forward "^\n" end)
				 (when (< (point) end)
				   ;; Break at multiline string.
				   (setq literal-pos (1+ end))
				   (throw 'done t)))))
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			    (t (skip-syntax-backward "w_")) ; Speedup only.
			    )))
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		  (if (and (numberp literal-pos)
			   (< (point) literal-pos))
		      ;; We jumped over a comment or string that
		      ;; should be investigated.
		      (goto-char literal-pos)
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		    (setq count (1- count))))
	      (error
	       (goto-char (point-min))
	       (setq count 0)))
	  (condition-case nil
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	      ;; Stop before `{', `}', and `#' when it's at boi on a
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	      ;; line, but on the other side of the syntactic ws, and
	      ;; after `;', `}' and `};'.  Only stop before `{' if at
	      ;; top level or inside braces, though.  Move by sexps
	      ;; and move into parens.  Also stop at eol of lines
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	      ;; with `#' at the boi.
	      (let ((literal-pos (not sentence-flag))
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		    (large-enough (point-max))
		    last)
		(catch 'done
		  (while t
		    (setq last (point))
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		    (if literal-pos
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			(c-forward-comment large-enough)
		      (if (progn
			    (skip-chars-forward " \t\n\r\f")
			    ;; Record position of first comment.
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			    (setq literal-pos (point))
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			    (c-forward-comment 1))
			  (c-forward-comment large-enough)
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			(setq literal-pos nil)))
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		    (cond ((and (eq (char-after) ?{)
				(not (and c-special-brace-lists
					  (c-looking-at-special-brace-list)))
				(/= here last)
				(save-excursion
				  (or (not (c-safe (up-list -1) t))
				      (= (char-after) ?{))))
			   (goto-char last)
			   (throw 'done t))
			  ((and c-special-brace-lists
				(eq (char-after) ?})
				(save-excursion
				  (and (c-safe (up-list -1) t)
				       (c-looking-at-special-brace-list))))
			   (forward-char 1)
			   (skip-syntax-forward "w_")) ; Speedup only.
			  ((and (eq (char-after) ?})
				(/= here last))
			   (goto-char last)
			   (throw 'done t))
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			  ((and (eq (char-after) ?#)
				(= (point) (c-point 'boi)))
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			   (if (= here last)
			       (or (re-search-forward "\\(^\\|[^\\]\\)$" nil t)
				   (goto-char (point-max)))
			     (goto-char last))
			   (throw 'done t))
			  ((looking-at ";\\|};?")
			   (goto-char (match-end 0))
			   (throw 'done t))
			  ((= (char-syntax (char-after)) ?\")
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			   (let ((beg (point)))
			     (c-forward-sexp)
			     (save-excursion
			       (skip-chars-backward "^\n" beg)
			       (when (> (point) beg)
				 ;; Break at multiline string.
				 (setq literal-pos beg)
				 (throw 'done t)))))
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			  (t
			   (forward-char 1)
			   (skip-syntax-forward "w_")) ; Speedup only.
			  )))
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		(if (and (numberp literal-pos)
			 (> (point) literal-pos))
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		    ;; We jumped over a comment that should be investigated.
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		    (goto-char literal-pos)
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		  (setq count (1+ count))))
	    (error
	     (goto-char (point-max))
	     (setq count 0)))
	  ))
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      ;; If we haven't moved we're near a buffer limit.
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      (when (and (not (zerop count)) (= (point) here))
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	(goto-char (if (> count 0) (point-min) (point-max)))
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	(setq count 0))))
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  (c-keep-region-active))

(defun c-end-of-statement (&optional count lim sentence-flag)
  "Go to the end of the innermost C statement.
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With prefix arg, go forward N - 1 statements.  Move forward to the end
of the next statement if already at end, and move into nested blocks
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\(use \\[forward-sexp] to skip over a block).  If within or next to a
comment or multiline string, move by sentences instead of statements.
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When called from a program, this function takes 3 optional args: the
repetition count, a buffer position limit which is the farthest back
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to search for the syntactic context, and a flag saying whether to do
sentence motion in or near comments and multiline strings."
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  (interactive (list (prefix-numeric-value current-prefix-arg)
		     nil t))
  (c-beginning-of-statement (- (or count 1)) lim sentence-flag)
  (c-keep-region-active))


;; set up electric character functions to work with pending-del,
;; (a.k.a. delsel) mode.  All symbols get the t value except
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;; the functions which delete, which gets 'supersede.
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(mapcar
 (function
  (lambda (sym)
    (put sym 'delete-selection t)	; for delsel (Emacs)
    (put sym 'pending-delete t)))	; for pending-del (XEmacs)
 '(c-electric-pound
   c-electric-brace
   c-electric-slash
   c-electric-star
   c-electric-semi&comma
   c-electric-lt-gt
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   c-electric-colon
   c-electric-paren))
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(put 'c-electric-delete    'delete-selection 'supersede) ; delsel
(put 'c-electric-delete    'pending-delete   'supersede) ; pending-del
(put 'c-electric-backspace 'delete-selection 'supersede) ; delsel
(put 'c-electric-backspace 'pending-delete   'supersede) ; pending-del
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(put 'c-electric-delete-forward 'delete-selection 'supersede) ; delsel
(put 'c-electric-delete-forward 'pending-delete   'supersede) ; pending-del
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;; This is used by indent-for-comment to decide how much to indent a
;; comment in C code based on its context.
(defun c-comment-indent ()
  (if (looking-at (concat "^\\(" c-comment-start-regexp "\\)"))
      0				;Existing comment at bol stays there.
    (let ((opoint (point))
	  placeholder)
      (save-excursion
	(beginning-of-line)
	(cond
	 ;; CASE 1: A comment following a solitary close-brace should
	 ;; have only one space.
	 ((looking-at (concat "[ \t]*}[ \t]*\\($\\|"
			      c-comment-start-regexp
			      "\\)"))
	  (search-forward "}")
	  (1+ (current-column)))
	 ;; CASE 2: 2 spaces after #endif
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	 ((or (looking-at "[ \t]*#[ \t]*endif[ \t]*")
	      (looking-at "[ \t]*#[ \t]*else[ \t]*"))
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	  7)
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	 ;; CASE 3: when c-indent-comments-syntactically-p is t,
	 ;; calculate the offset according to c-offsets-alist.
	 ;; E.g. identical to hitting TAB.
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	 ((and c-indent-comments-syntactically-p
	       (save-excursion
		 (skip-chars-forward " \t")
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		 (or (looking-at c-comment-start-regexp)
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		     (eolp))))
	  (let ((syntax (c-guess-basic-syntax)))
	    ;; BOGOSITY ALERT: if we're looking at the eol, its
	    ;; because indent-for-comment hasn't put the comment-start
	    ;; in the buffer yet.  this will screw up the syntactic
	    ;; analysis so we kludge in the necessary info.  Another
	    ;; kludge is that if we're at the bol, then we really want
	    ;; to ignore any anchoring as specified by
	    ;; c-comment-only-line-offset since it doesn't apply here.
	    (if (save-excursion
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		  (back-to-indentation)
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		  (eolp))
		(c-add-syntax 'comment-intro))
	    (let ((c-comment-only-line-offset
		   (if (consp c-comment-only-line-offset)
		       c-comment-only-line-offset
		     (cons c-comment-only-line-offset
			   c-comment-only-line-offset))))
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	      (c-get-syntactic-indentation syntax))))
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	 ;; CASE 4: If previous line is a comment-only line, use its
	 ;; indentation if it's greater than comment-column.  Leave at
	 ;; least one space between the comment and the last nonblank
	 ;; character in any case.
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	 ((save-excursion
	    (beginning-of-line)
	    (and (not (bobp))
		 (forward-line -1))
	    (skip-chars-forward " \t")
	    (prog1
		(looking-at c-comment-start-regexp)
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	      (setq placeholder (current-column))))
	  (goto-char opoint)
	  (skip-chars-backward " \t")
	  (max (if (bolp) 0 (1+ (current-column)))
	       placeholder
	       comment-column))
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	 ;; CASE 5: If comment-column is 0, and nothing but space
	 ;; before the comment, align it at 0 rather than 1.
	 ((progn
	    (goto-char opoint)
	    (skip-chars-backward " \t")
	    (and (= comment-column 0) (bolp)))
	  0)
	 ;; CASE 6: indent at comment column except leave at least one
	 ;; space.
	 (t (max (1+ (current-column))
		 comment-column))
	 )))))

1290

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;; used by outline-minor-mode
(defun c-outline-level ()
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  ;; This so that `current-column' DTRT in otherwise-hidden text.
  (let (buffer-invisibility-spec)
    (save-excursion
      (skip-chars-forward "\t ")
      (current-column))))
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(defun c-up-conditional (count)
  "Move back to the containing preprocessor conditional, leaving mark behind.
A prefix argument acts as a repeat count.  With a negative argument,
move forward to the end of the containing preprocessor conditional.
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`#elif' is treated like `#else' followed by `#if', so the function
stops at them when going backward, but not when going forward."
  (interactive "p")
  (c-forward-conditional (- count) -1)
  (c-keep-region-active))
  
(defun c-up-conditional-with-else (count)
  "Move back to the containing preprocessor conditional, including `#else'.
Just like `c-up-conditional', except it also stops at `#else'
directives."
  (interactive "p")
  (c-forward-conditional (- count) -1 t)
  (c-keep-region-active))

(defun c-down-conditional (count)
  "Move forward into the next preprocessor conditional, leaving mark behind.
A prefix argument acts as a repeat count.  With a negative argument,
move backward into the previous preprocessor conditional.

`#elif' is treated like `#else' followed by `#if', so the function
stops at them when going forward, but not when going backward."
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  (interactive "p")
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  (c-forward-conditional count 1)
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  (c-keep-region-active))

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(defun c-down-conditional-with-else (count)
  "Move forward into the next preprocessor conditional, including `#else'.
Just like `c-down-conditional', except it also stops at `#else'
directives."
  (interactive "p")
  (c-forward-conditional count 1 t)
  (c-keep-region-active))

(defun c-backward-conditional (count &optional target-depth with-else)
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  "Move back across a preprocessor conditional, leaving mark behind.
A prefix argument acts as a repeat count.  With a negative argument,
move forward across a preprocessor conditional."
  (interactive "p")
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  (c-forward-conditional (- count) target-depth with-else)
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  (c-keep-region-active))

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(defun c-forward-conditional (count &optional target-depth with-else)
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  "Move forward across a preprocessor conditional, leaving mark behind.
A prefix argument acts as a repeat count.  With a negative argument,
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move backward across a preprocessor conditional.

`#elif' is treated like `#else' followed by `#if', except that the
nesting level isn't changed when tracking subconditionals.

The optional argument TARGET-DEPTH specifies the wanted nesting depth
after each scan.  I.e. if TARGET-DEPTH is -1, the function will move
out of the enclosing conditional.  A non-integer non-nil TARGET-DEPTH
counts as -1.

If the optional argument WITH-ELSE is non-nil, `#else' directives are
treated as conditional clause limits.  Normally they are ignored."
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  (interactive "p")
  (let* ((forward (> count 0))
	 (increment (if forward -1 1))
	 (search-function (if forward 're-search-forward 're-search-backward))
	 (new))
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    (unless (integerp target-depth)
      (setq target-depth (if target-depth -1 0)))
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    (save-excursion
      (while (/= count 0)
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	(let ((depth 0)
	      ;; subdepth is the depth in "uninteresting" subtrees,
	      ;; i.e. those that takes us farther from the target
	      ;; depth instead of closer.
	      (subdepth 0)
	      found)
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	  (save-excursion
	    ;; Find the "next" significant line in the proper direction.
	    (while (and (not found)
			;; Rather than searching for a # sign that
			;; comes at the beginning of a line aside from
			;; whitespace, search first for a string
			;; starting with # sign.  Then verify what
			;; precedes it.  This is faster on account of
			;; the fastmap feature of the regexp matcher.
			(funcall search-function
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				 "#[ \t]*\\(if\\|elif\\|endif\\|else\\)"
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				 nil t))
	      (beginning-of-line)
	      ;; Now verify it is really a preproc line.
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	      (if (looking-at "^[ \t]*#[ \t]*\\(if\\|elif\\|endif\\|else\\)")
		  (let (dchange (directive (match-string 1)))
		    (cond ((string= directive "if")
			   (setq dchange (- increment)))
			  ((string= directive "endif")
			   (setq dchange increment))
			  ((= subdepth 0)
			   ;; When we're not in an "uninteresting"
			   ;; subtree, we might want to act on "elif"
			   ;; and "else" too.
			   (if (cond (with-else
				      ;; Always move toward the target depth.
				      (setq dchange
					    (if (> target-depth 0) 1 -1)))
				     ((string= directive "elif")
				      (setq dchange (- increment))))
			       ;; Ignore the change if it'd take us
			       ;; into an "uninteresting" subtree.
			       (if (eq (> dchange 0) (<= target-depth 0))
				   (setq dchange nil)))))
		    (when dchange
		      (when (or (/= subdepth 0)
				(eq (> dchange 0) (<= target-depth 0)))
			(setq subdepth (+ subdepth dchange)))
		      (setq depth (+ depth dchange))
		      ;; If we are trying to move across, and we find an
		      ;; end before we find a beginning, get an error.
		      (if (and (< depth target-depth) (< dchange 0))
			  (error (if forward
				     "No following conditional at this level"
				   "No previous conditional at this level"))))
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		    ;; When searching forward, start from next line so
		    ;; that we don't find the same line again.
		    (if forward (forward-line 1))
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		    ;; We found something if we've arrived at the
		    ;; target depth.
		    (if (and dchange (= depth target-depth))
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			(setq found (point))))
		;; else
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		(if forward (forward-line 1)))))
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	  (or found
	      (error "No containing preprocessor conditional"))
	  (goto-char (setq new found)))
	(setq count (+ count increment))))
    (push-mark)
    (goto-char new))
  (c-keep-region-active))


;; commands to indent lines, regions, defuns, and expressions
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(defun c-indent-command (&optional arg)
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  "Indent current line as C code, and/or insert some whitespace.

If `c-tab-always-indent' is t, always just indent the current line.
If nil, indent the current line only if point is at the left margin or
in the line's indentation; otherwise insert some whitespace[*].  If
other than nil or t, then some whitespace[*] is inserted only within
literals (comments and strings) and inside preprocessor directives,
but the line is always reindented.

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If `c-syntactic-indentation' is t, indentation is done according to
the syntactic context.  If it's nil, the line is just indented one
step according to `c-basic-offset'.  In this mode, a numeric argument
indents a number of such steps, positive or negative, and an empty
prefix argument is equivalent to -1.

If `c-syntactic-indentation' is t, then a numeric argument, regardless
of its value, means indent rigidly all the lines of the expression
starting after point so that this line becomes properly indented.  The
relative indentation among the lines of the expression is preserved.
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