Function: nnmail-process-unix-mail-format

nnmail-process-unix-mail-format is a byte-compiled function defined in nnmail.el.gz.

Signature

(nnmail-process-unix-mail-format FUNC ARTNUM-FUNC)

Source Code

;; Defined in /usr/src/emacs/lisp/gnus/nnmail.el.gz
(defun nnmail-process-unix-mail-format (func artnum-func)
  (let ((case-fold-search t)
	(count 0)
	start message-id content-length end skip head-end)
    (goto-char (point-min))
    (if (not (and (re-search-forward "^From " nil t)
		  (goto-char (match-beginning 0))))
	;; Possibly wrong format?
	(error "Error, unknown mail format! (Possibly corrupted %s `%s'.)"
	       (if (buffer-file-name) "file" "buffer")
	       (or (buffer-file-name) (buffer-name)))
      ;; Carry on until the bitter end.
      (while (not (eobp))
	(setq start (point)
	      end nil)
	;; Find the end of the head.
	(narrow-to-region
	 start
	 (if (search-forward "\n\n" nil t)
	     (1- (point))
	   ;; This will never happen, but just to be on the safe side --
	   ;; if there is no head-body delimiter, we search a bit manually.
	   (while (and (looking-at "From \\|[^ \t]+:")
		       (not (eobp)))
	     (forward-line 1))
	   (point)))
	;; Find the Message-ID header.
	(goto-char (point-min))
	(if (re-search-forward "^Message-ID[ \t]*:[ \n\t]*\\(<[^>]+>\\)" nil t)
	    (setq message-id (match-string 1))
	  (save-excursion
	    (when (re-search-forward "^Message-ID[ \t]*:" nil t)
	      (beginning-of-line)
	      (insert "Original-")))
	  ;; There is no Message-ID here, so we create one.
	  (forward-line 1)
	  (insert "Message-ID: " (setq message-id (nnmail-message-id)) "\n"))
	;; Look for a Content-Length header.
	(goto-char (point-min))
	(if (not (re-search-forward
		  "^Content-Length:[ \t]*\\([0-9]+\\)" nil t))
	    (setq content-length nil)
	  (setq content-length (string-to-number (match-string 1)))
	  ;; We destroy the header, since none of the backends ever
	  ;; use it, and we do not want to confuse other mailers by
	  ;; having a (possibly) faulty header.
	  (beginning-of-line)
	  (insert "X-"))
	(run-hooks 'nnmail-prepare-incoming-header-hook)
	;; Find the end of this article.
	(goto-char (point-max))
	(widen)
	(setq head-end (point))
	;; We try the Content-Length value.  The idea: skip over the header
	;; separator, then check what happens content-length bytes into the
	;; message body.  This should be either the end of the buffer, the
	;; message separator or a blank line followed by the separator.
	;; The blank line should probably be deleted.  If neither of the
	;; three is met, the content-length header is probably invalid.
	(when content-length
	  (forward-line 1)
	  (setq skip (+ (point) content-length))
	  (goto-char skip)
	  (cond ((or (= skip (point-max))
		     (= (1+ skip) (point-max)))
		 (setq end (point-max)))
		((looking-at "From ")
		 (setq end skip))
		((looking-at "[ \t]*\n\\(From \\)")
		 (setq end (match-beginning 1)))
		(t (setq end nil))))
	(if end
	    (goto-char end)
	  ;; No Content-Length, so we find the beginning of the next
	  ;; article or the end of the buffer.
	  (goto-char head-end)
	  (or (nnmail-search-unix-mail-delim)
	      (goto-char (point-max))))
	;; Allow the backend to save the article.
	(save-excursion
	  (save-restriction
	    (narrow-to-region start (point))
	    (goto-char (point-min))
            (incf count)
	    (nnmail-check-duplication message-id func artnum-func)
	    (setq end (point-max))))
	(goto-char end)))
    count))