home *** CD-ROM | disk | FTP | other *** search
-
- (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)
- (process-send-string process (concat "#include \"" tempfile "\"\n"))
- (process-send-string process "\n")
- (process-send-region process beg end)
- (process-send-string process "\n")
- (process-send-eof process))
- (while (eq (process-status process) 'run)
- (accept-process-output))
- (delete-file tempfile)
- (save-excursion
- (set-buffer outbuf)
- (goto-char (point-max))
- (re-search-backward "\n# [12] \"\"")
- (forward-line 2)
- (while (eolp) (delete-char 1))
- (delete-region (point-min) (point)))
- (display-buffer outbuf)))
-