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+;; Hairy rfc822 parser for mail and news and suchlike
+;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
+;; Author Richard Mlynarik.
+
+;; 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.
+
+(provide 'rfc822)
+
+;; uses address-start free, throws to address
+(defun rfc822-bad-address (reason)
+  (save-restriction
+    (insert "_^_")
+    (narrow-to-region address-start
+                      (if (re-search-forward "[,;]" nil t)
+                          (max (point-min) (1- (point)))
+                        (point-max)))
+    ;; make the error string be suitable for inclusion in (...)
+    (let ((losers '("\\" "(" ")" "\n")))
+      (while losers
+        (goto-char (point-min))
+        (while (search-forward (car losers) nil t)
+          (backward-char 1)
+          (insert ?\\)
+          (forward-char 1))
+        (setq losers (cdr losers))))
+    (goto-char (point-min)) (insert "(Unparsable address -- "
+                                    reason
+                                    ":\n\t  \"")
+    (goto-char (point-max)) (insert "\")"))
+  (rfc822-nuke-whitespace)
+  (throw 'address (buffer-substring address-start (point))))
+
+(defun rfc822-nuke-whitespace (&optional leave-space)
+  (let (ch)
+    (while (cond ((eobp)
+                  nil)
+                 ((= (setq ch (following-char)) ?\()
+                  (forward-char 1)
+                  (while (if (eobp)
+                             (rfc822-bad-address "Unbalanced comment (...)")
+                           (/= (setq ch (following-char)) ?\)))
+                    (cond ((looking-at "[^()\\]+")
+                           (replace-match ""))
+                          ((= ch ?\()
+                           (rfc822-nuke-whitespace))
+                          ((< (point) (1- (point-max)))
+                           (delete-char 2))
+                          (t
+                           (rfc822-bad-address "orphaned backslash"))))
+                  ;; delete remaining "()"
+                  (forward-char -1)
+                  (delete-char 2)
+                  t)
+                 ((memq ch '(?\ ?\t ?\n))
+                  (delete-region (point)
+                                 (progn (skip-chars-forward " \t\n") (point)))
+                  t)
+                 (t
+                  nil)))
+    (or (not leave-space)
+        (eobp)
+        (bobp)
+        (= (preceding-char) ?\ )
+        (insert ?\ ))))
+
+(defun rfc822-looking-at (regex &optional leave-space)
+  (if (cond ((stringp regex)
+             (if (looking-at regex)
+                 (progn (goto-char (match-end 0))
+                        t)))
+            (t
+             (if (and (not (eobp))
+                      (= (following-char) regex))
+                 (progn (forward-char 1)
+                        t))))
+      (let ((tem (match-data)))
+        (rfc822-nuke-whitespace leave-space)
+        (store-match-data tem)
+        t)))
+
+(defun rfc822-snarf-word ()
+  ;; word is atom | quoted-string
+  (cond ((= (following-char) ?\")
+         ;; quoted-string
+         (or (rfc822-looking-at "\"\\([^\"\\\n]\\|\\\\.\\|\\\\\n\\)*\"")
+             (rfc822-bad-address "Unterminated quoted string")))
+        ((rfc822-looking-at "[^][\000-\037\177-\377 ()<>@,;:\\\".]+")
+         ;; atom
+         )
+        (t
+         (rfc822-bad-address "Rubbish in address"))))
+
+(defun rfc822-snarf-words ()
+  (rfc822-snarf-word)
+  (while (rfc822-looking-at ?.)
+    (rfc822-snarf-word)))
+
+(defun rfc822-snarf-subdomain ()
+  ;; sub-domain is domain-ref | domain-literal
+  (cond ((= (following-char) ?\[)
+         ;; domain-ref
+         (or (rfc822-looking-at "\\[\\([^][\\\n]\\|\\\\.\\|\\\\\n\\)*\\]")
+             (rfc822-bad-address "Unterminated domain literal [...]")))
+        ((rfc822-looking-at "[^][\000-\037\177-\377 ()<>@,;:\\\".]+")
+         ;; domain-literal = atom
+         )
+        (t
+         (rfc822-bad-address "Rubbish in host/domain specification"))))
+
+(defun rfc822-snarf-domain ()
+  (rfc822-snarf-subdomain)
+  (while (rfc822-looking-at ?.)
+    (rfc822-snarf-subdomain)))
+
+(defun rfc822-snarf-frob-list (name separator terminator snarfer
+                                    &optional return)
+  (let ((first t)
+        (list ())
+        tem)
+    (while (cond ((eobp)
+                  (rfc822-bad-address
+                    (format "End of addresses in middle of %s" name)))
+                 ((rfc822-looking-at terminator)
+                  nil)
+                 ((rfc822-looking-at separator)
+                  ;; multiple separators are allowed and do nothing.
+                  (while (rfc822-looking-at separator))
+                  t)
+                 (first
+                  t)
+                 (t
+                  (rfc822-bad-address
+                    (format "Gubbish in middle of %s" name))))
+      (setq tem (funcall snarfer)
+            first nil)
+      (and return tem
+           (setq list (if (listp tem)
+                          (nconc (reverse tem) list)
+                          (cons tem list)))))
+    (nreverse list)))
+
+;; return either an address (a string) or a list of addresses
+(defun rfc822-addresses-1 (&optional allow-groups)
+  ;; Looking for an rfc822 `address'
+  ;; Either a group (1*word ":" [#mailbox] ";")
+  ;; or a mailbox (addr-spec | 1*word route-addr)
+  ;;  addr-spec is (local-part "@" domain)
+  ;;  route-addr is ("<" [1#("@" domain) ":"] addr-spec ">")
+  ;;  local-part is (word *("." word))
+  ;;  word is (atom | quoted-string)
+  ;;  quoted-string is ("\([^\"\\n]\|\\.\|\\\n\)")
+  ;;  atom is [^\000-\037\177 ()<>@,;:\".[]]+
+  ;;  domain is sub-domain *("." sub-domain)
+  ;;  sub-domain is domain-ref | domain-literal
+  ;;  domain-literal is  "[" *(dtext | quoted-pair) "]"
+  ;;  dtext is "[^][\\n"
+  ;;  domain-ref is atom
+  (let ((address-start (point))
+        (n 0))
+    (catch 'address
+      ;; optimize common cases:
+      ;;  foo
+      ;;  foo.bar@bar.zap
+      ;; followed by "\\'\\|,\\|([^()\\]*)\\'"
+      ;; other common cases are:
+      ;;  foo bar <foo.bar@baz.zap>
+      ;;  "foo bar" <foo.bar@baz.zap>
+      ;;  those aren't hacked yet.
+      (if (and (rfc822-looking-at "[^][\000-\037\177-\377 ()<>@,;:\\\"]+\\(\\|@[^][\000-\037\177-\377 ()<>@,;:\\\"]+\\)" t)
+               (progn (or (eobp)
+                          (rfc822-looking-at ?,))))
+          (progn
+            ;; rfc822-looking-at may have inserted a space
+            (or (bobp) (/= (preceding-char) ?\ ) (delete-char -1))
+            ;; relying on the fact that rfc822-looking-at <char>
+            ;;  doesn't mung match-data
+            (throw 'address (buffer-substring address-start (match-end 0)))))
+      (goto-char address-start)
+      (while t
+        (cond ((and (= n 1) (rfc822-looking-at ?@))
+               ;; local-part@domain
+               (rfc822-snarf-domain)
+               (throw 'address
+                 (buffer-substring address-start (point))))
+              ((rfc822-looking-at ?:)
+               (cond ((not allow-groups)
+                      (rfc822-bad-address "A group name may not appear here"))
+                     ((= n 0)
+                      (rfc822-bad-address "No name for :...; group")))
+               ;; group
+               (throw 'address
+                 ;; return a list of addresses
+                 (rfc822-snarf-frob-list ":...; group" ?\, ?\;
+                                         'rfc822-addresses-1 t)))
+              ((rfc822-looking-at ?<)
+               (let ((start (point))
+                     (strip t))
+                 (cond ((rfc822-looking-at ?>)
+                        ;; empty path
+                        ())
+                       ((and (not (eobp)) (= (following-char) ?\@))
+                        ;; <@foo.bar,@baz:quux@abcd.efg>
+                        (rfc822-snarf-frob-list "<...> address" ?\, ?\:
+                          (function (lambda ()
+                                      (if (rfc822-looking-at ?\@)
+                                          (rfc822-snarf-domain)
+                                        (rfc822-bad-address
+                                          "Gubbish in route-addr")))))
+                        (rfc822-snarf-words)
+                        (or (rfc822-looking-at ?@)
+                            (rfc822-bad-address "Malformed <..@..> address"))
+                        (rfc822-snarf-domain)
+                        (setq strip nil))
+                       ((progn (rfc822-snarf-words) (rfc822-looking-at ?@))
+                        ; allow <foo> (losing unix seems to do this)
+                        (rfc822-snarf-domain)))
+                 (let ((end (point)))
+                   (if (rfc822-looking-at ?\>)
+                       (throw 'address
+                         (buffer-substring (if strip start (1- start))
+                                           (if strip end (1+ end))))
+                     (rfc822-bad-address "Unterminated <...> address")))))
+              ((looking-at "[^][\000-\037\177-\377 ()<>@,;:\\.]")
+               ;; this allows "." to be part of the words preceding
+               ;; an addr-spec, since many broken mailers output
+               ;; "Hern K. Herklemeyer III
+               ;;   <yank@megadeath.dod.gods-own-country>"
+               (or (= n 0)
+                   (= (preceding-char) ?\ )
+                   (insert ?\ ))
+               (rfc822-snarf-words)
+               (setq n (1+ n)))
+              ((= n 0)
+               (throw 'address nil))
+              ((= n 1) ; allow "foo" (losing unix seems to do this)
+               (throw 'address
+                 (buffer-substring address-start (point))))
+              ((or (eobp) (looking-at ","))
+               (rfc822-bad-address "Missing comma or route-spec"))
+              (t
+               (rfc822-bad-address "Strange character or missing comma")))))))
+
+                           
+(defun rfc822-addresses (header-text)
+  (if (string-match "\\`[ \t]*\\([^][\000-\037\177-\377 ()<>@,;:\\\".]+\\)[ \t]*\\'"
+                    header-text)
+      ;; Make very simple case moderately fast.
+      (list (substring header-text (match-beginning 1) (match-end 1)))
+    (let ((buf (generate-new-buffer " rfc822")))
+      (unwind-protect
+        (save-excursion
+          (set-buffer buf)
+          (make-local-variable 'case-fold-search)
+          (setq case-fold-search nil)   ;For speed(?)
+          (insert header-text)
+          ;; unfold continuation lines
+          (goto-char (point-min))
+
+          (while (re-search-forward "\\([^\\]\\(\\\\\\\\\\)*\\)\n[ \t]" nil t)
+            (replace-match "\\1 " t))
+
+          (goto-char (point-min))
+          (rfc822-nuke-whitespace)
+          (let ((list ())
+                tem
+                address-start); this is for rfc822-bad-address
+            (while (not (eobp))
+              (setq address-start (point))
+              (setq tem
+                    (catch 'address ; this is for rfc822-bad-address
+                      (cond ((rfc822-looking-at ?\,)
+                             nil)
+                            ((looking-at "[][\000-\037\177-\377@;:\\.>]")
+                             (forward-char)
+                             (rfc822-bad-address
+                               (format "Strange character \\%c found"
+                                       (preceding-char))))
+                            (t
+                             (rfc822-addresses-1 t)))))
+              (cond ((null tem))
+                    ((stringp tem)
+                     (setq list (cons tem list)))
+                    (t
+                     (setq list (nconc (nreverse tem) list)))))
+            (nreverse list)))
+      (and buf (kill-buffer buf))))))
+