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(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)))
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