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- ;; C macro expansion
- ;; Copyright (C) 1988 Free Software Foundation, Inc.
-
- ;; 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 1, 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
- ;; along with GNU Emacs; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-
- (defun c-macro-expand (beg end)
- "Display the result of expanding all C macros occurring in the region.
- The expansion is entirely correct because it uses the C preprocessor."
- (interactive "r")
- (let ((outbuf (get-buffer-create "*Macroexpansion*"))
- (tempfile "%%macroexpand%%")
- process
- last-needed)
- (save-excursion
- (set-buffer outbuf)
- (erase-buffer))
- (setq process (start-process "macros" outbuf "/lib/cpp"))
- (set-process-sentinel process '(lambda (&rest x)))
- (save-restriction
- (widen)
- (save-excursion
- (goto-char beg)
- (beginning-of-line)
- (setq last-needed (point))
- (if (re-search-backward "^[ \t]*#" nil t)
- (progn
- ;; Skip continued lines.
- (while (progn (end-of-line) (= (preceding-char) ?\\))
- (forward-line 1))
- ;; Skip the last line of the macro definition we found.
- (forward-line 1)
- (setq last-needed (point)))))
- (write-region (point-min) last-needed tempfile nil 'nomsg)
- ;; Output comment ender in case last #-directive is inside a comment.
- ;; Also, terminate any string that we are in.
- (write-region "*//*\"*/\n" nil tempfile t 'nomsg)
- (write-region beg end (concat tempfile "x") nil 'nomsg)
- (process-send-string process (concat "#include \"" tempfile "\"\n"))
- (process-send-string process "\n")
- (process-send-string process (concat "#include \"" tempfile "x\"\n"))
- (process-send-eof process))
- (while (eq (process-status process) 'run)
- (accept-process-output))
- (delete-file tempfile)
- (delete-file (concat tempfile "x"))
- (display-buffer outbuf)
- (save-excursion
- (set-buffer outbuf)
- (goto-char (point-max))
- (forward-line -1)
- (delete-region (point) (point-max))
- (re-search-backward "\n# 1 ")
- (forward-line 2)
- (while (eolp) (delete-char 1))
- (delete-region (point-min) (point)))
- (display-buffer outbuf)))
-