1 ;;; nntp.el --- NNTP (RFC977) Interface for GNU Emacs
2 ;; Copyright (C) 1987,88,89,90,92,93,94,95 Free Software Foundation, Inc.
4 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
5 ;; Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to
22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
32 (autoload 'news-setup "rnewspost")
33 (autoload 'news-reply-mode "rnewspost")
34 (autoload 'nnmail-request-post-buffer "nnmail")
35 (autoload 'cancel-timer "timer"))
37 (defvar nntp-server-hook nil
38 "Hooks for the NNTP server.
39 If the kanji code of the NNTP server is different from the local kanji
40 code, the correct kanji code of the buffer associated with the NNTP
41 server must be specified as follows:
43 \(setq nntp-server-hook
46 ;; Server's Kanji code is EUC (NEmacs hack).
47 (make-local-variable 'kanji-fileio-code)
48 (setq kanji-fileio-code 0))))
50 If you'd like to change something depending on the server in this
51 hook, use the variable `nntp-server-name'.")
53 (defvar nntp-server-opened-hook nil
54 "Hook used for sending commands to the server at startup. The
55 default value is `nntp-send-mode-reader', whick makes an innd server
56 spawn an nnrpd server. Another useful function to put in this hook
57 might be `nntp-send-authinfo', which will prompt for a password to
58 allow posting from the server. Note that this is only necessary to do
59 on servers that use strict access control.")
60 (add-hook 'nntp-server-opened-hook 'nntp-send-mode-reader)
62 (defvar nntp-large-newsgroup 50
63 "The number of the articles which indicates a large newsgroup.
64 If the number of the articles is greater than the value, verbose
65 messages will be shown to indicate the current status.")
67 (defvar nntp-buggy-select (memq system-type '(usg-unix-v fujitsu-uts))
68 "t if your select routine is buggy.
69 If the select routine signals error or fall into infinite loop while
70 waiting for the server response, the variable must be set to t. In
71 case of Fujitsu UTS, it is set to T since `accept-process-output'
72 doesn't work properly.")
74 (defvar nntp-maximum-request 400
75 "The maximum number of the requests sent to the NNTP server at one time.
76 If Emacs hangs up while retrieving headers, set the variable to a
79 (defvar nntp-debug-read 10000
80 "Display '...' every 10Kbytes of a message being received if it is non-nil.
81 If it is a number, dots are displayed per the number.")
83 (defvar nntp-nov-is-evil nil
84 "If non-nil, nntp will never attempt to use XOVER when talking to the server.")
86 (defvar nntp-xover-commands '("XOVER" "XOVERVIEW")
87 "List of strings that are used as commands to fetch NOV lines from a server.
88 The strings are tried in turn until a positive response is gotten. If
89 none of the commands are successful, nntp will just grab headers one
92 (defvar nntp-connection-timeout nil
93 "Number of seconds to wait before an nntp connection times out.
94 If this variable is nil, which is the default, no timers are set.")
97 (defconst nntp-version "nntp 4.0"
98 "Version numbers of this version of NNTP.")
100 (defvar nntp-server-name nil
101 "The name of the NNTP server.")
103 (defvar nntp-server-buffer nil
104 "Buffer associated with the NNTP server process.")
106 (defvar nntp-server-process nil
107 "The NNTP server process.
108 You'd better not use this variable in NNTP front-end program, but
109 instead use `nntp-server-buffer'.")
111 (defvar nntp-status-string nil
112 "Save the server response message.
113 You'd better not use this variable in NNTP front-end program but
114 instead call function `nntp-status-message' to get status message.")
116 (defvar nntp-current-server "")
117 (defvar nntp-server-alist nil)
118 (defvar nntp-server-xover t)
119 (defvar nntp-current-group "")
121 ;;; Interface funtions.
123 (defun nntp-retrieve-headers (sequence &optional newsgroup server)
124 "Retrieve the headers to the articles in SEQUENCE."
125 (nntp-possibly-change-server newsgroup server)
127 (set-buffer nntp-server-buffer)
129 (if (and (not gnus-nov-is-evil)
130 (not nntp-nov-is-evil)
131 (nntp-retrieve-headers-with-xover sequence))
133 (let ((number (length sequence))
136 (last-point (point-min)))
137 ;; Send HEAD command.
139 (nntp-send-strings-to-server "HEAD" (car sequence))
140 (setq sequence (cdr sequence))
141 (setq count (1+ count))
142 ;; Every 400 header requests we have to read stream in order
143 ;; to avoid deadlock.
144 (if (or (null sequence) ;All requests have been sent.
145 (zerop (% count nntp-maximum-request)))
147 (accept-process-output)
149 (goto-char last-point)
151 (while (re-search-forward "^[0-9]" nil t)
152 (setq received (1+ received)))
153 (setq last-point (point))
155 ;; If number of headers is greater than 100, give
156 ;; informative messages.
157 (and (numberp nntp-large-newsgroup)
158 (> number nntp-large-newsgroup)
159 (zerop (% received 20))
160 (message "NNTP: Receiving headers... %d%%"
161 (/ (* received 100) number)))
162 (nntp-accept-response)))))
163 ;; Wait for text of last command.
164 (goto-char (point-max))
165 (re-search-backward "^[0-9]" nil t)
166 (if (looking-at "^[23]")
168 (goto-char (- (point-max) 3))
169 (not (looking-at "^\\.\r$")))
170 (nntp-accept-response)))
171 (and (numberp nntp-large-newsgroup)
172 (> number nntp-large-newsgroup)
173 (message "NNTP: Receiving headers... done"))
175 ;; Now all of replies are received.
176 (setq received number)
177 ;; First, fold continuation lines.
178 (goto-char (point-min))
179 (while (re-search-forward "\\(\r?\n[ \t]+\\)+" nil t)
180 (replace-match " " t t))
182 (goto-char (point-min))
183 (while (re-search-forward "\r" nil t)
184 (replace-match "" t t))
187 (defun nntp-open-server (server &optional service)
188 "Open news server on SERVER.
189 If SERVER is nil, use value of environment variable `NNTPSERVER'.
190 If optional argument SERVICE is non-nil, open by the service name."
191 (let ((server (or server (getenv "NNTPSERVER")))
194 (and nntp-connection-timeout
195 (run-at-time nntp-connection-timeout
196 nil 'nntp-kill-connection server))))
197 (setq nntp-status-string "")
198 (message "nntp: Connecting to server on %s..." server)
199 (cond ((and server (nntp-open-server-internal server service))
200 (setq nntp-current-server server)
202 (setq status (nntp-wait-for-response "^[23].*\r$"))
203 (error (nntp-close-server-internal server)))
204 (and nntp-server-process
206 (set-process-sentinel
207 nntp-server-process 'nntp-default-sentinel)
208 ;; You can send commands at startup like AUTHINFO here.
209 ;; Added by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>
210 (run-hooks 'nntp-server-opened-hook))))
212 (setq nntp-status-string "NNTP server is not specified.")))
213 (and timer (cancel-timer timer))
217 (defun nntp-close-server (&optional server)
219 (nntp-possibly-change-server nil server)
222 ;; Un-set default sentinel function before closing connection.
223 (and nntp-server-process
224 (eq 'nntp-default-sentinel
225 (process-sentinel nntp-server-process))
226 (set-process-sentinel nntp-server-process nil))
227 ;; We cannot send QUIT command unless the process is running.
228 (if (nntp-server-opened)
229 (nntp-send-command nil "QUIT")))
230 (nntp-close-server-internal server)))
232 (fset 'nntp-request-quit (symbol-function 'nntp-close-server))
234 (defun nntp-server-opened (&optional server)
235 "Return server process status.
236 If the stream is opened, return non-nil, otherwise return nil."
237 (if (or server nntp-current-server)
238 (let ((process (nth 1 (assoc (or server nntp-current-server)
239 nntp-server-alist))))
241 (memq (process-status process) '(open run))))))
243 (defun nntp-status-message (&optional server)
244 "Return server status response as string."
245 (if (and nntp-status-string
247 (string-match "[0-9][0-9][0-9][ \t]+\\([^\r]*\\).*$"
249 (substring nntp-status-string (match-beginning 1) (match-end 1))
250 ;; Empty message if nothing.
253 (defun nntp-request-article (id &optional newsgroup server buffer)
254 "Select article by message ID (or number)."
255 (nntp-possibly-change-server newsgroup server)
258 (if buffer (set-process-buffer nntp-server-process buffer))
259 (let ((nntp-server-buffer (or buffer nntp-server-buffer)))
260 ;; If NEmacs, end of message may look like: "\256\215" (".^M")
262 (nntp-send-command "^\\.\r$" "ARTICLE" id)
263 (nntp-decode-text))))
264 (if buffer (set-process-buffer nntp-server-process nntp-server-buffer))))
266 (defun nntp-request-body (id &optional newsgroup server)
267 "Select article body by message ID (or number)."
268 (nntp-possibly-change-server newsgroup server)
270 ;; If NEmacs, end of message may look like: "\256\215" (".^M")
271 (nntp-send-command "^\\.\r$" "BODY" id)
274 (defun nntp-request-head (id &optional newsgroup server)
275 "Select article head by message ID (or number)."
276 (nntp-possibly-change-server newsgroup server)
278 (nntp-send-command "^\\.\r$" "HEAD" id)
281 (defun nntp-request-stat (id &optional newsgroup server)
282 "Select article by message ID (or number)."
283 (nntp-possibly-change-server newsgroup server)
284 (nntp-send-command "^[23].*\r$" "STAT" id))
286 (defun nntp-request-group (group &optional server dont-check)
288 (if (nntp-possibly-change-server nil server)
289 (nntp-send-command "^.*\r$" "GROUP" group)))
291 (defun nntp-request-group-description (group &optional server)
293 (if (nntp-possibly-change-server nil server)
294 (nntp-send-command "^.*\r$" "XGTITLE" group)))
296 (defun nntp-close-group (group &optional server)
299 (defun nntp-request-list (&optional server)
300 "List active newsgroups."
301 (nntp-possibly-change-server nil server)
303 (nntp-send-command "^\\.\r$" "LIST")
306 (defun nntp-request-list-newsgroups (&optional server)
307 "List newsgroups (defined in NNTP2)."
308 (nntp-possibly-change-server nil server)
310 (nntp-send-command "^\\.\r$" "LIST NEWSGROUPS")
313 (defun nntp-request-newgroups (date &optional server)
314 "List new groups (defined in NNTP2)."
315 (nntp-possibly-change-server nil server)
316 (let ((date (timezone-parse-date date))
318 (format "%s%02d%02d %s%s%s"
319 (substring (aref date 0) 2) (string-to-int (aref date 1))
320 (string-to-int (aref date 2)) (substring (aref date 3) 0 2)
321 (substring (aref date 3) 3 5) (substring (aref date 3) 6 8))))
323 (nntp-send-command "^\\.\r$" "NEWGROUPS" time-string)
324 (nntp-decode-text))))
326 (defun nntp-request-list-distributions (&optional server)
327 "List distributions (defined in NNTP2)."
328 (nntp-possibly-change-server nil server)
330 (nntp-send-command "^\\.\r$" "LIST DISTRIBUTIONS")
333 (defun nntp-request-last (&optional newsgroup server)
334 "Set current article pointer to the previous article
335 in the current news group."
336 (nntp-possibly-change-server newsgroup server)
337 (nntp-send-command "^[23].*\r$" "LAST"))
339 (defun nntp-request-next (&optional newsgroup server)
340 "Advance current article pointer."
341 (nntp-possibly-change-server newsgroup server)
342 (nntp-send-command "^[23].*\r$" "NEXT"))
344 (defun nntp-request-post (&optional server)
345 "Post a new news in current buffer."
346 (nntp-possibly-change-server nil server)
347 (if (nntp-send-command "^[23].*\r$" "POST")
350 (nntp-send-region-to-server (point-min) (point-max))
351 ;; 1.2a NNTP's post command is buggy. "^M" (\r) is not
352 ;; appended to end of the status message.
353 (nntp-wait-for-response "^[23].*$"))))
355 (defun nntp-request-post-buffer
356 (post group subject header article-buffer info follow-to
358 (if (assq 'to-address (nth 4 info))
359 (nnmail-request-post-buffer
360 post group subject header article-buffer info follow-to respect-poster)
361 (let (from date to followup-to newsgroups message-of
362 references distribution message-id)
364 (set-buffer (get-buffer-create "*post-news*"))
366 (if (and (buffer-modified-p)
368 (not (y-or-n-p "Unsent article being composed; erase it? ")))
372 (news-setup nil subject nil group nil)
374 (set-buffer article-buffer)
375 (goto-char (point-min))
376 (narrow-to-region (point-min)
377 (progn (search-forward "\n\n") (point)))
378 (setq from (header-from header))
379 (setq date (header-date header))
382 (string-match " *at \\| *@ \\| *(\\| *<" from)))
385 (concat (if stop-pos (substring from 0 stop-pos) from)
386 "'s message of " date))))
387 (setq subject (or subject (header-subject header)))
388 (or (string-match "^[Rr][Ee]:" subject)
389 (setq subject (concat "Re: " subject)))
390 (setq followup-to (mail-fetch-field "followup-to"))
391 (if (or (null respect-poster) ;Ignore followup-to: field.
392 (string-equal "" followup-to) ;Bogus header.
393 (string-equal "poster" followup-to)) ;Poster
394 (setq followup-to nil))
396 (or follow-to followup-to (mail-fetch-field "newsgroups")))
397 (setq references (header-references header))
398 (setq distribution (mail-fetch-field "distribution"))
399 ;; Remove bogus distribution.
400 (and (stringp distribution)
401 (string-match "world" distribution)
402 (setq distribution nil))
403 (setq message-id (header-id header))
405 (setq news-reply-yank-from from)
406 (setq news-reply-yank-message-id message-id)
407 (news-setup to subject message-of newsgroups article-buffer)
408 ;; Fold long references line to follow RFC1036.
409 (mail-position-on-field "References")
410 (let ((begin (- (point) (length "References: ")))
413 (if references (insert references))
414 (if (and references message-id) (insert " "))
415 (if message-id (insert message-id))
416 ;; The region must end with a newline to fill the region
417 ;; without inserting extra newline.
418 (fill-region-as-paragraph begin (1+ (point))))
421 (mail-position-on-field "Distribution")
422 (insert distribution)))))
425 ;;; Internal functions.
427 (defun nntp-send-mode-reader ()
428 "Send the MODE READER command to the nntp server.
429 This function is supposed to be called from `nntp-server-opened-hook'.
430 It will make innd servers enter nnrpd mode to allow actual article
432 (nntp-send-command "^.*\r$" "MODE READER"))
434 (defun nntp-send-authinfo ()
435 "Send the AUTHINFO to the nntp server.
436 This function is supposed to be called from `nntp-server-opened-hook'.
437 It will prompt for a password."
438 (nntp-send-command "^.*\r$" "AUTHINFO USER" (user-login-name))
439 (nntp-send-command "^.*\r$" "AUTHINFO PASS" (read-string "NNTP password: ")))
441 (defun nntp-default-sentinel (proc status)
442 "Default sentinel function for NNTP server process."
443 (let ((servers nntp-server-alist))
444 ;; Go through the alist of server names and find the name of the
445 ;; server that the process that sent the signal is connected to.
446 ;; If you get my drift.
448 (not (equal proc (nth 1 (car servers)))))
449 (setq servers (cdr servers)))
450 (message "nntp: Connection closed to server %s."
451 (or (car (car servers)) "(none)"))
454 (defun nntp-kill-connection (server)
455 (let ((proc (nth 1 (assoc server nntp-server-alist))))
456 (if proc (delete-process (process-name proc)))
457 (nntp-close-server server)
458 (setq nntp-status-string
459 (message "Connection timed out to server %s." server))
462 ;; Encoding and decoding of NNTP text.
464 (defun nntp-decode-text ()
465 "Decode text transmitted by NNTP.
466 0. Delete status line.
467 1. Delete `^M' at end of line.
468 2. Delete `.' at end of buffer (end of text mark).
469 3. Delete `.' at beginning of line."
471 (set-buffer nntp-server-buffer)
472 ;; Insert newline at end of buffer.
473 (goto-char (point-max))
476 ;; Delete status line.
477 (goto-char (point-min))
478 (delete-region (point) (progn (forward-line 1) (point)))
479 ;; Delete `^M' at end of line.
480 ;; (replace-regexp "\r$" "")
483 (if (= (preceding-char) ?\r)
486 ;; Delete `.' at end of buffer (end of text mark).
487 (goto-char (point-max))
488 (forward-line -1) ;(beginning-of-line)
489 (if (looking-at "^\\.$")
490 (delete-region (point) (progn (forward-line 1) (point))))
491 ;; Replace `..' at beginning of line with `.'.
492 (goto-char (point-min))
493 ;; (replace-regexp "^\\.\\." ".")
494 (while (search-forward "\n.." nil t)
497 (defun nntp-encode-text ()
498 "Encode text in current buffer for NNTP transmission.
499 1. Insert `.' at beginning of line.
500 2. Insert `.' at end of buffer (end of text mark)."
502 ;; Insert newline at end of buffer.
503 (goto-char (point-max))
506 ;; Replace `.' at beginning of line with `..'.
507 (goto-char (point-min))
508 ;; (replace-regexp "^\\." "..")
509 (while (search-forward "\n." nil t)
511 ;; Insert `.' at end of buffer (end of text mark).
512 (goto-char (point-max))
517 ;;; Synchronous Communication with NNTP Server.
520 (defun nntp-send-command (response cmd &rest args)
521 "Wait for server RESPONSE after sending CMD and optional ARGS to server."
523 ;; Clear communication buffer.
524 (set-buffer nntp-server-buffer)
526 (apply 'nntp-send-strings-to-server cmd args)
528 (nntp-wait-for-response response)
531 (defun nntp-wait-for-response (regexp)
532 "Wait for server response which matches REGEXP."
536 (dotnum 0) ;Number of "." being displayed.
537 (dotsize ;How often "." displayed.
538 (if (numberp nntp-debug-read) nntp-debug-read 10000)))
539 (set-buffer nntp-server-buffer)
540 ;; Wait for status response (RFC977).
541 ;; 1xx - Informative message.
543 ;; 3xx - Command ok so far, send the rest of it.
544 ;; 4xx - Command was correct, but couldn't be performed for some
546 ;; 5xx - Command unimplemented, or incorrect, or a serious
547 ;; program error occurred.
548 (nntp-accept-response)
550 (goto-char (point-min))
551 (cond ((looking-at "[23]")
556 (t (nntp-accept-response))))
557 ;; Save status message.
559 (setq nntp-status-string
560 (buffer-substring (point-min) (point)))
565 (goto-char (point-max))
566 (forward-line -1) ;(beginning-of-line)
567 ;;(message (buffer-substring
569 ;; (save-excursion (end-of-line) (point))))
570 (if (looking-at regexp)
573 (let ((newnum (/ (buffer-size) dotsize)))
574 (if (not (= dotnum newnum))
577 (message "NNTP: Reading %s"
578 (make-string dotnum ?.))))))
579 (nntp-accept-response)))
581 (if (and nntp-debug-read (> dotnum 0))
583 ;; Successfully received server response.
588 ;;; Low-Level Interface to NNTP Server.
591 (defun nntp-retrieve-headers-with-xover (sequence)
592 (if (not nntp-server-xover)
594 (let ((range (format "%d-%d" (car sequence)
595 (nntp-last-element sequence))))
597 (if (stringp nntp-server-xover)
598 (nntp-send-command "^\\.\r$" nntp-server-xover range)
599 (let ((commands nntp-xover-commands))
601 (eq t nntp-server-xover))
602 (nntp-send-command "^\\.\r$" (car commands) range)
604 (set-buffer nntp-server-buffer)
606 (if (looking-at "[23]")
607 (setq nntp-server-xover (car commands))))
608 (setq commands (cdr commands)))
609 (if (eq t nntp-server-xover)
610 (setq nntp-server-xover nil))
611 (setcar (nthcdr 2 (assoc nntp-current-server nntp-server-alist))
614 (if nntp-server-xover (nntp-decode-text) (erase-buffer))))))
616 (defun nntp-send-strings-to-server (&rest strings)
617 "Send list of STRINGS to news server as command and its arguments."
618 (let ((cmd (car strings))
619 (strings (cdr strings)))
620 ;; Command and each argument must be separated by one or more spaces.
622 (setq cmd (concat cmd " " (car strings)))
623 (setq strings (cdr strings)))
624 ;; Command line must be terminated by a CR-LF.
625 (if (not (nntp-server-opened nntp-current-server))
627 (nntp-close-server nntp-current-server)
628 (if (not (nntp-open-server nntp-current-server))
629 (error (nntp-status-message)))
631 (set-buffer nntp-server-buffer)
633 (process-send-string nntp-server-process (concat cmd "\r\n"))))
635 (defun nntp-send-region-to-server (begin end)
636 "Send current buffer region (from BEGIN to END) to news server."
638 ;; We have to work in the buffer associated with NNTP server
639 ;; process because of NEmacs hack.
640 (copy-to-buffer nntp-server-buffer begin end)
641 (set-buffer nntp-server-buffer)
642 (setq begin (point-min))
643 (setq end (point-max))
644 ;; `process-send-region' does not work if text to be sent is very
645 ;; large. I don't know maximum size of text sent correctly.
647 (size 100)) ;Size of text sent at once.
649 (narrow-to-region begin end)
652 ;;(setq last (min end (+ (point) size)))
653 ;; NEmacs gets confused if character at `last' is Kanji.
654 (setq last (save-excursion
655 (goto-char (min end (+ (point) size)))
656 (or (eobp) (forward-char 1)) ;Adjust point
658 (process-send-region nntp-server-process (point) last)
659 ;; I don't know whether the next codes solve the known
660 ;; problem of communication error of GNU Emacs.
661 (accept-process-output)
664 ;; We cannot erase buffer, because reply may be received.
665 (delete-region begin end)))
667 (defun nntp-open-server-internal (server &optional service)
668 "Open connection to news server on SERVER by SERVICE (default is nntp)."
671 ;; Use TCP/IP stream emulation package if needed.
672 (or (fboundp 'open-network-stream)
674 ;; Initialize communication buffer.
675 (nnheader-init-server-buffer)
676 (set-buffer nntp-server-buffer)
680 "nntpd" (current-buffer) server (or service "nntp"))
683 (setq nntp-server-process proc)
684 ;; Suggested by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
685 (process-kill-without-query proc)
686 (setq nntp-server-xover t)
687 (setq nntp-server-name server)
688 (setq nntp-server-alist (cons (list server nntp-server-process t)
690 ;; It is possible to change kanji-fileio-code in this hook.
691 (run-hooks 'nntp-server-hook)
692 nntp-server-process)))))
694 (defun nntp-close-server-internal (&optional server)
695 "Close connection to news server."
696 (nntp-possibly-change-server nil server)
697 (if nntp-server-process
698 (delete-process nntp-server-process))
699 (setq nntp-server-process nil)
700 (setq nntp-server-alist (delq (assoc nntp-current-server nntp-server-alist)
702 (setq nntp-current-server ""))
704 (defun nntp-request-close ()
705 "Close all server connections."
706 (while nntp-server-alist
707 (delete-process (car (cdr (car nntp-server-alist))))
708 (setq nntp-server-alist (cdr nntp-server-alist)))
709 (setq nntp-current-server "")
710 (setq nntp-server-process nil))
712 (defun nntp-accept-response ()
713 "Read response of server.
714 It is well-known that the communication speed will be much improved by
715 defining this function as macro."
716 ;; To deal with server process exiting before
717 ;; accept-process-output is called.
718 ;; Suggested by Jason Venner <jason@violet.berkeley.edu>.
719 ;; This is a copy of `nntp-default-sentinel'.
720 (if (or (not nntp-server-process)
721 (not (memq (process-status nntp-server-process) '(open run))))
722 (error (format "nntp: Process connection closed"))
723 (if nntp-buggy-select
725 ;; We cannot use `accept-process-output'.
726 ;; Fujitsu UTS requires messages during sleep-for. I don't know why.
727 (message "NNTP: Reading...")
730 (condition-case errorcode
731 (accept-process-output nntp-server-process)
733 (cond ((string-equal "select error: Invalid argument"
735 ;; Ignore select error.
738 (signal (car errorcode) (cdr errorcode)))))))))
740 (defun nntp-last-element (list)
741 "Return last element of LIST."
743 (setq list (cdr list)))
746 (defun nntp-possibly-change-server (newsgroup server)
747 (let (result changed-server)
748 ;; First see if we need to change the server - or even open a new
750 (if (and server (not (string= server nntp-current-server)))
752 ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>.
753 (if (or (assoc server nntp-server-alist)
754 (nntp-open-server server))
755 ;; `nntp-open-server' may change `nntp-server-alist', so
757 (let ((info (assoc server nntp-server-alist)))
758 (setq nntp-current-server server)
759 ;; Variable for backwards compatability.
760 (setq nntp-server-name server)
761 (setq nntp-server-process (nth 1 info))
762 (setq nntp-server-xover (nth 2 info))
763 (setq changed-server t)
766 ;; The we see whether it is necessary to change newsgroup.
767 (and newsgroup result
768 (or (not (string= newsgroup nntp-current-group))
771 (setq result (nntp-request-group newsgroup server))
772 (setq nntp-current-group newsgroup)))
777 ;;; nntp.el ends here