code.delx.au - gnu-emacs/blob - lisp/nntp.el

   1 ;;; nntp.el --- nntp access for Gnus
   2 ;; Copyright (C) 1987,88,89,90,92,93,94,95 Free Software Foundation, Inc.
   3
   4 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
   5 ;;      Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  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)
  13 ;; any later version.
  14
  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.
  19
  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.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (require 'rnews)
  29 (require 'sendmail)
  30 (require 'nnheader)
  31
  32 (eval-when-compile (require 'cl))
  33
  34 (eval-and-compile
  35   (autoload 'news-setup "rnewspost")
  36   (autoload 'news-reply-mode "rnewspost")
  37   (autoload 'nnmail-request-post-buffer "nnmail")
  38   (autoload 'cancel-timer "timer")
  39   (autoload 'telnet "telnet" nil t)
  40   (autoload 'telnet-send-input "telnet" nil t)
  41   (autoload 'timezone-parse-date "timezone"))
  42
  43 (defvar nntp-server-hook nil
  44   "*Hooks for the NNTP server.
  45 If the kanji code of the NNTP server is different from the local kanji
  46 code, the correct kanji code of the buffer associated with the NNTP
  47 server must be specified as follows:
  48
  49 \(setq nntp-server-hook
  50       (function
  51        (lambda ()
  52          ;; Server's Kanji code is EUC (NEmacs hack).
  53          (make-local-variable 'kanji-fileio-code)
  54          (setq kanji-fileio-code 0))))
  55
  56 If you'd like to change something depending on the server in this
  57 hook, use the variable `nntp-address'.")
  58
  59 (defvar nntp-server-opened-hook nil
  60   "*Hook used for sending commands to the server at startup.
  61 The default value is `nntp-send-mode-reader', which makes an innd
  62 server spawn an nnrpd server.  Another useful function to put in this
  63 hook might be `nntp-send-authinfo', which will prompt for a password
  64 to allow posting from the server.  Note that this is only necessary to
  65 do on servers that use strict access control.")
  66 (add-hook 'nntp-server-opened-hook 'nntp-send-mode-reader)
  67
  68 (defvar nntp-open-server-function 'nntp-open-network-stream
  69   "*Function used for connecting to a remote system.
  70 It will be called with the address of the remote system.
  71
  72 Two pre-made functions are `nntp-open-network-stream', which is the
  73 default, and simply connects to some port or other on the remote
  74 system (see nntp-port-number).  The other is `nntp-open-rlogin', which
  75 does an rlogin on the remote system, and then does a telnet to the
  76 NNTP server available there (see nntp-rlogin-parameters).")
  77
  78 (defvar nntp-rlogin-parameters '("telnet" "${NNTPSERVER:=localhost}" "nntp")
  79   "*Parameters to `nntp-open-login'.
  80 That function may be used as `nntp-open-server-function'.  In that
  81 case, this list will be used as the parameter list given to rsh.")
  82
  83 (defvar nntp-rlogin-user-name nil
  84   "*User name on remote system when using the rlogin connect method.")
  85
  86 (defvar nntp-address nil
  87   "*The name of the NNTP server.")
  88
  89 (defvar nntp-port-number "nntp"
  90   "*Port number to connect to.")
  91
  92 (defvar nntp-large-newsgroup 50
  93   "*The number of the articles which indicates a large newsgroup.
  94 If the number of the articles is greater than the value, verbose
  95 messages will be shown to indicate the current status.")
  96
  97 (defvar nntp-buggy-select (memq system-type '(fujitsu-uts))
  98   "*t if your select routine is buggy.
  99 If the select routine signals error or fall into infinite loop while
 100 waiting for the server response, the variable must be set to t.  In
 101 case of Fujitsu UTS, it is set to T since `accept-process-output'
 102 doesn't work properly.")
 103
 104 (defvar nntp-maximum-request 400
 105   "*The maximum number of the requests sent to the NNTP server at one time.
 106 If Emacs hangs up while retrieving headers, set the variable to a
 107 lower value.")
 108
 109 (defvar nntp-debug-read 10000
 110   "*Display '...' every 10Kbytes of a message being received if it is non-nil.
 111 If it is a number, dots are displayed per the number.")
 112
 113 (defvar nntp-nov-is-evil nil
 114   "*If non-nil, nntp will never attempt to use XOVER when talking to the server.")
 115
 116 (defvar nntp-xover-commands '("XOVER" "XOVERVIEW")
 117   "*List of strings that are used as commands to fetch NOV lines from a server.
 118 The strings are tried in turn until a positive response is gotten. If
 119 none of the commands are successful, nntp will just grab headers one
 120 by one.")
 121
 122 (defvar nntp-nov-gap 20
 123   "*Maximum allowed gap between two articles.
 124 If the gap between two consecutive articles is bigger than this
 125 variable, split the XOVER request into two requests.")
 126
 127 (defvar nntp-connection-timeout nil
 128   "*Number of seconds to wait before an nntp connection times out.
 129 If this variable is nil, which is the default, no timers are set.")
 130
 131 (defvar nntp-news-default-headers nil
 132   "*If non-nil, override `mail-default-headers' when posting news.")
 133
 134 (defvar nntp-prepare-server-hook nil
 135   "*Hook run before a server is opened.
 136 If can be used to set up a server remotely, for instance.  Say you
 137 have an account at the machine \"other.machine\".  This machine has
 138 access to an NNTP server that you can't access locally.  You could
 139 then use this hook to rsh to the remote machine and start a proxy NNTP
 140 server there that you can connect to.")
 141
 142 (defvar nntp-async-number 5
 143   "*How many articles should be prefetched when in asynchronous mode.")
 144
 145
 146 \f
 147
 148 (defconst nntp-version "nntp 4.0"
 149   "Version numbers of this version of NNTP.")
 150
 151 (defvar nntp-server-buffer nil
 152   "Buffer associated with the NNTP server process.")
 153
 154 (defvar nntp-server-process nil
 155   "The NNTP server process.
 156 You'd better not use this variable in NNTP front-end program, but
 157 instead use `nntp-server-buffer'.")
 158
 159 (defvar nntp-status-string nil
 160   "Save the server response message.
 161 You'd better not use this variable in NNTP front-end program but
 162 instead call function `nntp-status-message' to get status message.")
 163
 164 (defvar nntp-opened-connections nil
 165   "All (possibly) opened connections.")
 166
 167 (defvar nntp-server-xover 'try)
 168 (defvar nntp-server-list-active-group 'try)
 169 (defvar nntp-current-group "")
 170 (defvar nntp-timeout-servers nil)
 171
 172 (defvar nntp-async-process nil)
 173 (defvar nntp-async-buffer nil)
 174 (defvar nntp-async-articles nil)
 175 (defvar nntp-async-fetched nil)
 176 (defvar nntp-async-group-alist nil)
 177
 178
 179 \f
 180 (defvar nntp-current-server nil)
 181 (defvar nntp-server-alist nil)
 182 (defvar nntp-server-variables
 183   (list
 184    (list 'nntp-server-hook nntp-server-hook)
 185    (list 'nntp-server-opened-hook nntp-server-opened-hook)
 186    (list 'nntp-port-number nntp-port-number)
 187    (list 'nntp-address nntp-address)
 188    (list 'nntp-large-newsgroup nntp-large-newsgroup)
 189    (list 'nntp-buggy-select nntp-buggy-select)
 190    (list 'nntp-maximum-request nntp-maximum-request)
 191    (list 'nntp-debug-read nntp-debug-read)
 192    (list 'nntp-nov-is-evil nntp-nov-is-evil)
 193    (list 'nntp-xover-commands nntp-xover-commands)
 194    (list 'nntp-connection-timeout nntp-connection-timeout)
 195    (list 'nntp-news-default-headers nntp-news-default-headers)
 196    (list 'nntp-prepare-server-hook nntp-prepare-server-hook)
 197    (list 'nntp-async-number nntp-async-number)
 198    '(nntp-async-process nil)
 199    '(nntp-async-buffer nil)
 200    '(nntp-async-articles nil)
 201    '(nntp-async-fetched nil)
 202    '(nntp-async-group-alist nil)
 203    '(nntp-server-process nil)
 204    '(nntp-status-string nil)
 205    '(nntp-server-xover try)
 206    '(nntp-server-list-active-group try)
 207    '(nntp-current-group "")))
 208
 209 \f
 210 ;;; Interface functions.
 211
 212 (defun nntp-retrieve-headers (sequence &optional newsgroup server)
 213   "Retrieve the headers to the articles in SEQUENCE."
 214   (nntp-possibly-change-server newsgroup server)
 215   (save-excursion
 216     (set-buffer nntp-server-buffer)
 217     (erase-buffer)
 218     (if (and (not gnus-nov-is-evil)
 219              (not nntp-nov-is-evil)
 220              (nntp-retrieve-headers-with-xover sequence))
 221         'nov
 222       (let ((number (length sequence))
 223             (count 0)
 224             (received 0)
 225             (last-point (point-min)))
 226         ;; Send HEAD command.
 227         (while sequence
 228           (nntp-send-strings-to-server
 229            "HEAD" (if (numberp (car sequence)) (int-to-string (car sequence))
 230                     (car sequence)))
 231           (setq sequence (cdr sequence)
 232                 count (1+ count))
 233           ;; Every 400 header requests we have to read stream in order
 234           ;;  to avoid deadlock.
 235           (if (or (null sequence)       ;All requests have been sent.
 236                   (zerop (% count nntp-maximum-request)))
 237               (progn
 238                 (nntp-accept-response)
 239                 (while (progn
 240                          (goto-char last-point)
 241                          ;; Count replies.
 242                          (while (re-search-forward "^[0-9]" nil t)
 243                            (setq received (1+ received)))
 244                          (setq last-point (point))
 245                          (< received count))
 246                   ;; If number of headers is greater than 100, give
 247                   ;;  informative messages.
 248                   (and (numberp nntp-large-newsgroup)
 249                        (> number nntp-large-newsgroup)
 250                        (zerop (% received 20))
 251                        (message "NNTP: Receiving headers... %d%%"
 252                                 (/ (* received 100) number)))
 253                   (nntp-accept-response)))))
 254         ;; Wait for text of last command.
 255         (goto-char (point-max))
 256         (re-search-backward "^[0-9]" nil t)
 257         (if (looking-at "^[23]")
 258             (while (progn
 259                      (goto-char (- (point-max) 3))
 260                      (not (looking-at "^\\.\r?\n")))
 261               (nntp-accept-response)))
 262         (and (numberp nntp-large-newsgroup)
 263              (> number nntp-large-newsgroup)
 264              (message "NNTP: Receiving headers...done"))
 265
 266         ;; Now all of replies are received.
 267         (setq received number)
 268         ;; First, fold continuation lines.
 269         (goto-char (point-min))
 270         (while (re-search-forward "\\(\r?\n[ \t]+\\)+" nil t)
 271           (replace-match " "))
 272         ;; Remove all "\r"'s
 273         (goto-char (point-min))
 274         (while (search-forward "\r" nil t)
 275           (replace-match ""))
 276         'headers))))
 277
 278
 279 (defun nntp-retrieve-groups (groups &optional server)
 280   (nntp-possibly-change-server nil server)
 281   (save-excursion
 282     (set-buffer nntp-server-buffer)
 283     (and (eq nntp-server-list-active-group 'try)
 284          (nntp-try-list-active (car groups)))
 285     (erase-buffer)
 286     (let ((count 0)
 287           (received 0)
 288           (last-point (point-min))
 289           (command (if nntp-server-list-active-group
 290                        "LIST ACTIVE" "GROUP")))
 291       (while groups
 292         (nntp-send-strings-to-server command (car groups))
 293         (setq groups (cdr groups))
 294         (setq count (1+ count))
 295         ;; Every 400 requests we have to read the stream in
 296         ;; order to avoid deadlocks.
 297         (if (or (null groups)           ;All requests have been sent.
 298                 (zerop (% count nntp-maximum-request)))
 299             (progn
 300               (nntp-accept-response)
 301               (while (progn
 302                        (goto-char last-point)
 303                        ;; Count replies.
 304                        (while (re-search-forward "^[0-9]" nil t)
 305                          (setq received (1+ received)))
 306                        (setq last-point (point))
 307                        (< received count))
 308                 (nntp-accept-response)))))
 309
 310       ;; Wait for the reply from the final command.
 311       (if nntp-server-list-active-group
 312           (progn
 313             (goto-char (point-max))
 314             (re-search-backward "^[0-9]" nil t)
 315             (if (looking-at "^[23]")
 316                 (while (progn
 317                          (goto-char (- (point-max) 3))
 318                          (not (looking-at "^\\.\r?\n")))
 319                   (nntp-accept-response)))))
 320
 321       ;; Now all replies are received. We remove CRs.
 322       (goto-char (point-min))
 323       (while (search-forward "\r" nil t)
 324         (replace-match "" t t))
 325
 326       (if nntp-server-list-active-group
 327           (progn
 328             ;; We have read active entries, so we just delete the
 329             ;; superfluos gunk.
 330             (goto-char (point-min))
 331             (while (re-search-forward "^[.2-5]" nil t)
 332               (delete-region (match-beginning 0)
 333                              (progn (forward-line 1) (point))))
 334             'active)
 335         'group))))
 336
 337 (defun nntp-open-server (server &optional defs connectionless)
 338   "Open the virtual server SERVER.
 339 If CONNECTIONLESS is non-nil, don't attempt to connect to any physical
 340 servers."
 341   (nnheader-init-server-buffer)
 342   (if (nntp-server-opened server)
 343       t
 344     (if (or (stringp (car defs))
 345             (numberp (car defs)))
 346         (setq defs (cons (list 'nntp-port-number (car defs)) (cdr defs))))
 347     (or (assq 'nntp-address defs)
 348         (setq defs (append defs (list (list 'nntp-address server)))))
 349     (if (and nntp-current-server
 350              (not (equal server nntp-current-server)))
 351         (setq nntp-server-alist
 352               (cons (list nntp-current-server
 353                           (nnheader-save-variables nntp-server-variables))
 354                     nntp-server-alist)))
 355     (let ((state (assoc server nntp-server-alist)))
 356       (if state
 357           (progn
 358             (nnheader-restore-variables (nth 1 state))
 359             (setq nntp-server-alist (delq state nntp-server-alist)))
 360         (nnheader-set-init-variables nntp-server-variables defs)))
 361     (setq nntp-current-server server)
 362     ;; We have now changed to the proper virtual server.  We then
 363     ;; check that the physical server is opened.
 364     (if (or (nntp-server-opened server)
 365             connectionless)
 366         t
 367       (if (member nntp-address nntp-timeout-servers)
 368           nil
 369         ;; We open a connection to the physical nntp server.
 370         (run-hooks 'nntp-prepare-server-hook)
 371         (nntp-open-server-semi-internal nntp-address nntp-port-number)))))
 372
 373 (defun nntp-close-server (&optional server)
 374   "Close connection to SERVER."
 375   (nntp-possibly-change-server nil server t)
 376   (unwind-protect
 377       (progn
 378         ;; Un-set default sentinel function before closing connection.
 379         (and nntp-server-process
 380              (eq 'nntp-default-sentinel
 381                  (process-sentinel nntp-server-process))
 382              (set-process-sentinel nntp-server-process nil))
 383         ;; We cannot send QUIT command unless the process is running.
 384         (if (nntp-server-opened)
 385             (nntp-send-command nil "QUIT")))
 386     (nntp-close-server-internal server)
 387     (setq nntp-timeout-servers (delete server nntp-timeout-servers))))
 388
 389 (defalias 'nntp-request-quit (symbol-function 'nntp-close-server))
 390
 391 (defun nntp-request-close ()
 392   "Close all server connections."
 393   (let (proc)
 394     (while nntp-opened-connections
 395       (setq proc (pop nntp-opened-connections))
 396       (and proc (delete-process proc)))
 397     (and nntp-async-buffer
 398          (get-buffer nntp-async-buffer)
 399          (kill-buffer nntp-async-buffer))
 400     (while nntp-server-alist
 401       (and (setq proc (nth 1 (assq 'nntp-async-buffer
 402                                    (car nntp-server-alist))))
 403            (buffer-name proc)
 404            (kill-buffer proc))
 405       (setq nntp-server-alist (cdr nntp-server-alist)))
 406     (setq nntp-current-server nil
 407           nntp-timeout-servers nil
 408           nntp-async-group-alist nil)))
 409
 410 (defun nntp-server-opened (&optional server)
 411   "Say whether a connection to SERVER has been opened."
 412   (and (equal server nntp-current-server)
 413        nntp-server-buffer
 414        (buffer-name nntp-server-buffer)
 415        nntp-server-process
 416        (memq (process-status nntp-server-process) '(open run))))
 417
 418 (defun nntp-status-message (&optional server)
 419   "Return server status as a string."
 420   (if (and nntp-status-string
 421            ;; NNN MESSAGE
 422            (string-match "[0-9][0-9][0-9][ \t]+\\([^\r]*\\).*$"
 423                          nntp-status-string))
 424       (substring nntp-status-string (match-beginning 1) (match-end 1))
 425     ;; Empty message if nothing.
 426     (or nntp-status-string "")))
 427
 428 (defun nntp-request-article (id &optional newsgroup server buffer)
 429   "Request article ID (message-id or number)."
 430   (nntp-possibly-change-server newsgroup server)
 431
 432   (let (found)
 433
 434     ;; First we see whether we can get the article from the async buffer.
 435     (if (and (numberp id)
 436              nntp-async-articles
 437              (memq id nntp-async-fetched))
 438         (save-excursion
 439           (set-buffer nntp-async-buffer)
 440           (let ((opoint (point))
 441                 (art (if (numberp id) (int-to-string id) id))
 442                 beg end)
 443             (if (and (or (re-search-forward (concat "^2.. +" art) nil t)
 444                          (progn
 445                            (goto-char (point-min))
 446                            (re-search-forward (concat "^2.. +" art) opoint t)))
 447                      (progn
 448                        (beginning-of-line)
 449                        (setq beg (point)
 450                              end (re-search-forward "^\\.\r?\n" nil t))))
 451                 (progn
 452                   (setq found t)
 453                   (save-excursion
 454                     (set-buffer (or buffer nntp-server-buffer))
 455                     (erase-buffer)
 456                     (insert-buffer-substring nntp-async-buffer beg end)
 457                     (let ((nntp-server-buffer (current-buffer)))
 458                       (nntp-decode-text)))
 459                   (delete-region beg end)
 460                   (and nntp-async-articles
 461                        (nntp-async-fetch-articles id)))))))
 462
 463     (if found
 464         t
 465       ;; The article was not in the async buffer, so we fetch it now.
 466       (unwind-protect
 467           (progn
 468             (if buffer (set-process-buffer nntp-server-process buffer))
 469             (let ((nntp-server-buffer (or buffer nntp-server-buffer))
 470                   (art (or (and (numberp id) (int-to-string id)) id)))
 471               ;; If NEmacs, end of message may look like: "\256\215" (".^M")
 472               (prog1
 473                   (nntp-send-command "^\\.\r?\n" "ARTICLE" art)
 474                 (nntp-decode-text)
 475                 (and nntp-async-articles (nntp-async-fetch-articles id)))))
 476         (if buffer (set-process-buffer
 477                     nntp-server-process nntp-server-buffer))))))
 478
 479 (defun nntp-request-body (id &optional newsgroup server)
 480   "Request body of article ID (message-id or number)."
 481   (nntp-possibly-change-server newsgroup server)
 482   (prog1
 483       ;; If NEmacs, end of message may look like: "\256\215" (".^M")
 484       (nntp-send-command
 485        "^\\.\r?\n" "BODY" (or (and (numberp id) (int-to-string id)) id))
 486     (nntp-decode-text)))
 487
 488 (defun nntp-request-head (id &optional newsgroup server)
 489   "Request head of article ID (message-id or number)."
 490   (nntp-possibly-change-server newsgroup server)
 491   (prog1
 492       (nntp-send-command
 493        "^\\.\r?\n" "HEAD" (or (and (numberp id) (int-to-string id)) id))
 494     (nntp-decode-text)))
 495
 496 (defun nntp-request-stat (id &optional newsgroup server)
 497   "Request STAT of article ID (message-id or number)."
 498   (nntp-possibly-change-server newsgroup server)
 499   (nntp-send-command
 500    "^[23].*\r?\n" "STAT" (or (and (numberp id) (int-to-string id)) id)))
 501
 502 (defun nntp-request-group (group &optional server dont-check)
 503   "Select GROUP."
 504   (nntp-send-command "^.*\r?\n" "GROUP" group)
 505   (setq nntp-current-group group)
 506   (save-excursion
 507     (set-buffer nntp-server-buffer)
 508     (goto-char (point-min))
 509     (looking-at "[23]")))
 510
 511 (defun nntp-request-asynchronous (group &optional server articles)
 512   (and nntp-async-articles (nntp-async-request-group group))
 513   (and
 514    nntp-async-number
 515    (if (not (or (nntp-async-server-opened)
 516                 (nntp-async-open-server)))
 517        (progn
 518          (message "Can't open second connection to %s" nntp-address)
 519          (ding)
 520          (setq nntp-async-articles nil)
 521          (sit-for 2))
 522      (setq nntp-async-articles articles)
 523      (setq nntp-async-fetched nil)
 524      (save-excursion
 525        (set-buffer nntp-async-buffer)
 526        (erase-buffer))
 527      (nntp-async-send-strings "GROUP" group)
 528      t)))
 529
 530 (defun nntp-list-active-group (group &optional server)
 531   (nntp-send-command "^.*\r?\n" "LIST ACTIVE" group))
 532
 533 (defun nntp-request-group-description (group &optional server)
 534   "Get description of GROUP."
 535   (nntp-possibly-change-server nil server)
 536   (prog1
 537       (nntp-send-command "^.*\r?\n" "XGTITLE" group)
 538     (nntp-decode-text)))
 539
 540 (defun nntp-close-group (group &optional server)
 541   (setq nntp-current-group nil)
 542   t)
 543
 544 (defun nntp-request-list (&optional server)
 545   "List active groups."
 546   (nntp-possibly-change-server nil server)
 547   (prog1
 548       (nntp-send-command "^\\.\r?\n" "LIST")
 549     (nntp-decode-text)))
 550
 551 (defun nntp-request-list-newsgroups (&optional server)
 552   "List groups."
 553   (nntp-possibly-change-server nil server)
 554   (prog1
 555       (nntp-send-command "^\\.\r?\n" "LIST NEWSGROUPS")
 556     (nntp-decode-text)))
 557
 558 (defun nntp-request-newgroups (date &optional server)
 559   "List new groups."
 560   (nntp-possibly-change-server nil server)
 561   (let* ((date (timezone-parse-date date))
 562          (time-string
 563           (format "%s%02d%02d %s%s%s"
 564                   (substring (aref date 0) 2) (string-to-int (aref date 1))
 565                   (string-to-int (aref date 2)) (substring (aref date 3) 0 2)
 566                   (substring
 567                    (aref date 3) 3 5) (substring (aref date 3) 6 8))))
 568     (prog1
 569         (nntp-send-command "^\\.\r?\n" "NEWGROUPS" time-string)
 570       (nntp-decode-text))))
 571
 572 (defun nntp-request-list-distributions (&optional server)
 573   "List distributions."
 574   (nntp-possibly-change-server nil server)
 575   (prog1
 576       (nntp-send-command "^\\.\r?\n" "LIST DISTRIBUTIONS")
 577     (nntp-decode-text)))
 578
 579 (defun nntp-request-last (&optional newsgroup server)
 580   "Decrease the current article pointer."
 581   (nntp-possibly-change-server newsgroup server)
 582   (nntp-send-command "^[23].*\r?\n" "LAST"))
 583
 584 (defun nntp-request-next (&optional newsgroup server)
 585   "Advance the current article pointer."
 586   (nntp-possibly-change-server newsgroup server)
 587   (nntp-send-command "^[23].*\r?\n" "NEXT"))
 588
 589 (defun nntp-request-post (&optional server)
 590   "Post the current buffer."
 591   (nntp-possibly-change-server nil server)
 592   (if (nntp-send-command "^[23].*\r?\n" "POST")
 593       (progn
 594         (nntp-encode-text)
 595         (nntp-send-region-to-server (point-min) (point-max))
 596         ;; 1.2a NNTP's post command is buggy. "^M" (\r) is not
 597         ;;  appended to end of the status message.
 598         (nntp-wait-for-response "^[23].*\n"))))
 599
 600 (defun nntp-request-post-buffer
 601   (post group subject header article-buffer info follow-to respect-poster)
 602   "Request a buffer suitable for composing an article.
 603 If POST, this is an original article; otherwise it's a followup.
 604 GROUP is the group to be posted to, the article should have subject
 605 SUBJECT.  HEADER is a Gnus header vector.  ARTICLE-BUFFER contains the
 606 article being followed up.  INFO is a Gnus info list.  If FOLLOW-TO,
 607 post to this group instead.  If RESPECT-POSTER, heed the special
 608 \"poster\" value of the Followup-to header."
 609   (if (assq 'to-address (nth 5 info))
 610       (nnmail-request-post-buffer
 611        post group subject header article-buffer info follow-to respect-poster)
 612     (let ((mail-default-headers
 613            (or nntp-news-default-headers mail-default-headers))
 614           from date to followup-to newsgroups message-of
 615           references distribution message-id)
 616       (save-excursion
 617         (set-buffer (get-buffer-create "*post-news*"))
 618         (news-reply-mode)
 619         (if (and (buffer-modified-p)
 620                  (> (buffer-size) 0)
 621                  (not (y-or-n-p "Unsent article being composed; erase it? ")))
 622             ()
 623           (erase-buffer)
 624           (if post
 625               (news-setup nil subject nil group nil)
 626             (save-excursion
 627               (set-buffer article-buffer)
 628               (goto-char (point-min))
 629               (narrow-to-region (point-min)
 630                                 (progn (search-forward "\n\n") (point)))
 631               (setq from (mail-header-from header))
 632               (setq date (mail-header-date header))
 633               (and from
 634                    (let ((stop-pos
 635                           (string-match "  *at \\|  *@ \\| *(\\| *<" from)))
 636                      (setq
 637                       message-of
 638                       (concat (if stop-pos (substring from 0 stop-pos) from)
 639                               "'s message of " date))))
 640               (setq subject (or subject (mail-header-subject header)))
 641               (or (string-match "^[Rr][Ee]:" subject)
 642                   (setq subject (concat "Re: " subject)))
 643               (setq followup-to (mail-fetch-field "followup-to"))
 644               (if (or (null respect-poster) ;Ignore followup-to: field.
 645                       (string-equal "" followup-to) ;Bogus header.
 646                       (string-equal "poster" followup-to);Poster
 647                       (and (eq respect-poster 'ask)
 648                            followup-to
 649                            (not (y-or-n-p (concat "Followup to "
 650                                                   followup-to "? ")))))
 651                   (setq followup-to nil))
 652               (setq newsgroups
 653                     (or follow-to followup-to (mail-fetch-field "newsgroups")))
 654               (setq references (mail-header-references header))
 655               (setq distribution (mail-fetch-field "distribution"))
 656               ;; Remove bogus distribution.
 657               (and (stringp distribution)
 658                    (string-match "world" distribution)
 659                    (setq distribution nil))
 660               (setq message-id (mail-header-id header))
 661               (widen))
 662             (setq news-reply-yank-from from)
 663             (setq news-reply-yank-message-id message-id)
 664             (news-setup to subject message-of
 665                         (if (stringp newsgroups) newsgroups "")
 666                         article-buffer)
 667             (if (and newsgroups (listp newsgroups))
 668                 (progn
 669                   (goto-char (point-min))
 670                   (while newsgroups
 671                     (insert (car (car newsgroups)) ": "
 672                             (cdr (car newsgroups)) "\n")
 673                     (setq newsgroups (cdr newsgroups)))))
 674             (nnheader-insert-references references message-id)
 675             (if distribution
 676                 (progn
 677                   (mail-position-on-field "Distribution")
 678                   (insert distribution)))))
 679         (current-buffer)))))
 680
 681 ;;; Internal functions.
 682
 683 (defun nntp-send-mode-reader ()
 684   "Send the MODE READER command to the nntp server.
 685 This function is supposed to be called from `nntp-server-opened-hook'.
 686 It will make innd servers spawn an nnrpd process to allow actual article
 687 reading."
 688   (nntp-send-command "^.*\r?\n" "MODE READER"))
 689
 690 (defun nntp-send-authinfo ()
 691   "Send the AUTHINFO to the nntp server.
 692 This function is supposed to be called from `nntp-server-opened-hook'.
 693 It will prompt for a password."
 694   (nntp-send-command "^.*\r?\n" "AUTHINFO USER" (user-login-name))
 695   (nntp-send-command "^.*\r?\n" "AUTHINFO PASS"
 696                      (read-string "NNTP password: ")))
 697
 698 (defun nntp-send-authinfo-from-file ()
 699   "Send the AUTHINFO to the nntp server.
 700 This function is supposed to be called from `nntp-server-opened-hook'.
 701 It will prompt for a password."
 702   (and (file-exists-p "~/.nntp-authinfo")
 703        (save-excursion
 704          (set-buffer (get-buffer-create " *tull*"))
 705          (insert-file-contents "~/.nntp-authinfo")
 706          (goto-char (point-min))
 707          (nntp-send-command "^.*\r?\n" "AUTHINFO USER" (user-login-name))
 708          (nntp-send-command "^.*\r?\n" "AUTHINFO PASS"
 709                             (buffer-substring (point)
 710                                               (progn (end-of-line) (point))))
 711          (kill-buffer (current-buffer)))))
 712
 713 (defun nntp-default-sentinel (proc status)
 714   "Default sentinel function for NNTP server process."
 715   (let ((servers nntp-server-alist)
 716         server)
 717     ;; Go through the alist of server names and find the name of the
 718     ;; server that the process that sent the signal is connected to.
 719     ;; If you get my drift.
 720     (if (equal proc nntp-server-process)
 721         (setq server nntp-address)
 722       (while (and servers
 723                   (not (equal proc (nth 1 (assq 'nntp-server-process
 724                                                 (car servers))))))
 725         (setq servers (cdr servers)))
 726       (setq server (car (car servers))))
 727     (and server
 728          (progn
 729            (message "nntp: Connection closed to server %s" server)
 730            (ding)))))
 731
 732 (defun nntp-kill-connection (server)
 733   (let ((proc (nth 1 (assq 'nntp-server-process
 734                            (assoc server nntp-server-alist)))))
 735     (and proc (delete-process (process-name proc)))
 736     (nntp-close-server server)
 737     (setq nntp-timeout-servers (cons server nntp-timeout-servers))
 738     (setq nntp-status-string
 739           (message "Connection timed out to server %s." server))
 740     (ding)
 741     (sit-for 1)))
 742
 743 ;; Encoding and decoding of NNTP text.
 744
 745 (defun nntp-decode-text ()
 746   "Decode text transmitted by NNTP.
 747 0. Delete status line.
 748 1. Delete `^M' at end of line.
 749 2. Delete `.' at end of buffer (end of text mark).
 750 3. Delete `.' at beginning of line."
 751   (save-excursion
 752     (set-buffer nntp-server-buffer)
 753     ;; Insert newline at end of buffer.
 754     (goto-char (point-max))
 755     (or (bolp) (insert "\n"))
 756     ;; Delete status line.
 757     (goto-char (point-min))
 758     (delete-region (point) (progn (forward-line 1) (point)))
 759     ;; Delete `^M' at the end of lines.
 760     (while (not (eobp))
 761       (end-of-line)
 762       (and (= (preceding-char) ?\r)
 763            (delete-char -1))
 764       (forward-line 1))
 765     ;; Delete `.' at end of the buffer (end of text mark).
 766     (goto-char (point-max))
 767     (forward-line -1)
 768     (if (looking-at "^\\.\n")
 769         (delete-region (point) (progn (forward-line 1) (point))))
 770     ;; Replace `..' at beginning of line with `.'.
 771     (goto-char (point-min))
 772     ;; (replace-regexp "^\\.\\." ".")
 773     (while (search-forward "\n.." nil t)
 774       (delete-char -1))))
 775
 776 (defun nntp-encode-text ()
 777   "Encode text in current buffer for NNTP transmission.
 778 1. Insert `.' at beginning of line.
 779 2. Insert `.' at end of buffer (end of text mark)."
 780   (save-excursion
 781     ;; Insert newline at end of buffer.
 782     (goto-char (point-max))
 783     (or (bolp) (insert "\n"))
 784     ;; Replace `.' at beginning of line with `..'.
 785     (goto-char (point-min))
 786     ;; (replace-regexp "^\\." "..")
 787     (while (search-forward "\n." nil t)
 788       (insert "."))
 789     ;; Insert `.' at end of buffer (end of text mark).
 790     (goto-char (point-max))
 791     (insert ".\r\n")))
 792
 793 \f
 794 ;;;
 795 ;;; Synchronous Communication with NNTP Server.
 796 ;;;
 797
 798 (defun nntp-send-command (response cmd &rest args)
 799   "Wait for server RESPONSE after sending CMD and optional ARGS to server."
 800   (save-excursion
 801     ;; Clear communication buffer.
 802     (set-buffer nntp-server-buffer)
 803     (erase-buffer)
 804     (apply 'nntp-send-strings-to-server cmd args)
 805     (if response
 806         (nntp-wait-for-response response)
 807       t)))
 808
 809 (defun nntp-wait-for-response (regexp &optional slow)
 810   "Wait for server response which matches REGEXP."
 811   (save-excursion
 812     (let ((status t)
 813           (wait t)
 814           (dotnum 0)                    ;Number of "." being displayed.
 815           (dotsize                      ;How often "." displayed.
 816            (if (numberp nntp-debug-read) nntp-debug-read 10000)))
 817       (set-buffer nntp-server-buffer)
 818       ;; Wait for status response (RFC977).
 819       ;; 1xx - Informative message.
 820       ;; 2xx - Command ok.
 821       ;; 3xx - Command ok so far, send the rest of it.
 822       ;; 4xx - Command was correct, but couldn't be performed for some
 823       ;;       reason.
 824       ;; 5xx - Command unimplemented, or incorrect, or a serious
 825       ;;       program error occurred.
 826       (nntp-accept-response)
 827       (while wait
 828         (goto-char (point-min))
 829         (if slow
 830             (progn
 831               (cond ((re-search-forward "^[23][0-9][0-9]" nil t)
 832                      (setq wait nil))
 833                     ((re-search-forward "^[45][0-9][0-9]" nil t)
 834                      (setq status nil)
 835                      (setq wait nil))
 836                     (t (nntp-accept-response)))
 837               (if (not wait) (delete-region (point-min)
 838                                             (progn (beginning-of-line)
 839                                                    (point)))))
 840           (cond ((looking-at "[23]")
 841                  (setq wait nil))
 842                 ((looking-at "[45]")
 843                  (setq status nil)
 844                  (setq wait nil))
 845                 (t (nntp-accept-response)))))
 846       ;; Save status message.
 847       (end-of-line)
 848       (setq nntp-status-string
 849             (buffer-substring (point-min) (point)))
 850       (if status
 851           (progn
 852             (setq wait t)
 853             (while wait
 854               (goto-char (point-max))
 855               (forward-line -1)         ;(beginning-of-line)
 856               ;;(message (buffer-substring
 857               ;;         (point)
 858               ;;         (save-excursion (end-of-line) (point))))
 859               (if (looking-at regexp)
 860                   (setq wait nil)
 861                 (if nntp-debug-read
 862                     (let ((newnum (/ (buffer-size) dotsize)))
 863                       (if (not (= dotnum newnum))
 864                           (progn
 865                             (setq dotnum newnum)
 866                             (message "NNTP: Reading %s"
 867                                      (make-string dotnum ?.))))))
 868                 (nntp-accept-response)))
 869             ;; Remove "...".
 870             (if (and nntp-debug-read (> dotnum 0))
 871                 (message ""))
 872             ;; Successfully received server response.
 873             t)))))
 874
 875 \f
 876
 877 ;;;
 878 ;;; Low-Level Interface to NNTP Server.
 879 ;;;
 880
 881 (defun nntp-retrieve-headers-with-xover (sequence)
 882   (erase-buffer)
 883   (cond
 884
 885    ;; This server does not talk NOV.
 886    ((not nntp-server-xover)
 887     nil)
 888
 889    ;; We don't care about gaps.
 890    ((not nntp-nov-gap)
 891     (nntp-send-xover-command
 892      (car sequence) (nntp-last-element sequence) 'wait)
 893
 894     (goto-char (point-min))
 895     (if (looking-at "[1-5][0-9][0-9] ")
 896         (delete-region (point) (progn (forward-line 1) (point))))
 897     (while (search-forward "\r" nil t)
 898       (replace-match "" t t))
 899     (goto-char (point-max))
 900     (forward-line -1)
 901     (if (looking-at "\\.")
 902         (delete-region (point) (progn (forward-line 1) (point)))))
 903
 904    ;; We do it the hard way.  For each gap, an XOVER command is sent
 905    ;; to the server.  We do not wait for a reply from the server, we
 906    ;; just send them off as fast as we can.  That means that we have
 907    ;; to count the number of responses we get back to find out when we
 908    ;; have gotten all we asked for.
 909    ((numberp nntp-nov-gap)
 910     (let ((count 0)
 911           (received 0)
 912           (last-point (point-min))
 913           (buf (current-buffer))
 914           first)
 915       ;; We have to check `nntp-server-xover'.  If it gets set to nil,
 916       ;; that means that the server does not understand XOVER, but we
 917       ;; won't know that until we try.
 918       (while (and nntp-server-xover sequence)
 919         (setq first (car sequence))
 920         ;; Search forward until we find a gap, or until we run out of
 921         ;; articles.
 922         (while (and (cdr sequence)
 923                     (< (- (nth 1 sequence) (car sequence)) nntp-nov-gap))
 924           (setq sequence (cdr sequence)))
 925
 926         (if (not (nntp-send-xover-command first (car sequence)))
 927             ()
 928           (setq sequence (cdr sequence)
 929                 count (1+ count))
 930
 931           ;; Every 400 requests we have to read the stream in
 932           ;; order to avoid deadlocks.
 933           (if (or (null sequence)       ;All requests have been sent.
 934                   (zerop (% count nntp-maximum-request)))
 935               (progn
 936                 (accept-process-output)
 937                 ;; On some Emacs versions the preceding function has
 938                 ;; a tendency to change the buffer. Perhaps. It's
 939                 ;; quite difficult to reporduce, because it only
 940                 ;; seems to happen once in a blue moon.
 941                 (set-buffer buf)
 942                 (while (progn
 943                          (goto-char last-point)
 944                          ;; Count replies.
 945                          (while (re-search-forward "^[0-9][0-9][0-9] " nil t)
 946                            (setq received (1+ received)))
 947                          (setq last-point (point))
 948                          (< received count))
 949                   (accept-process-output)
 950                   (set-buffer buf))))))
 951
 952       (if (not nntp-server-xover)
 953           ()
 954         ;; Wait for the reply from the final command.
 955         (goto-char (point-max))
 956         (re-search-backward "^[0-9][0-9][0-9] " nil t)
 957         (if (looking-at "^[23]")
 958             (while (progn
 959                      (goto-char (point-max))
 960                      (forward-line -1)
 961                      (not (looking-at "^\\.\r?\n")))
 962               (nntp-accept-response)))
 963
 964         ;; We remove any "." lines and status lines.
 965         (goto-char (point-min))
 966         (while (search-forward "\r" nil t)
 967           (delete-char -1))
 968         (goto-char (point-min))
 969         (delete-matching-lines "^\\.$\\|^[1-5][0-9][0-9] ")))))
 970
 971   nntp-server-xover)
 972
 973 (defun nntp-send-xover-command (beg end &optional wait-for-reply)
 974   (let ((range (format "%d-%d" beg end)))
 975     (if (stringp nntp-server-xover)
 976         ;; If `nntp-server-xover' is a string, then we just send this
 977         ;; command.
 978         (if wait-for-reply
 979             (nntp-send-command "^\\.\r?\n" nntp-server-xover range)
 980           ;; We do not wait for the reply.
 981           (progn
 982             (nntp-send-strings-to-server nntp-server-xover range)
 983             t))
 984       (let ((commands nntp-xover-commands))
 985         ;; `nntp-xover-commands' is a list of possible XOVER commands.
 986         ;; We try them all until we get at positive response.
 987         (while (and commands (eq nntp-server-xover 'try))
 988           (nntp-send-command "^\\.\r?\n" (car commands) range)
 989           (save-excursion
 990             (set-buffer nntp-server-buffer)
 991             (goto-char (point-min))
 992             (and (looking-at "[23]") ; No error message.
 993                  ;; We also have to look at the lines.  Some buggy
 994                  ;; servers give back simple lines with just the
 995                  ;; article number.  How... helpful.
 996                  (progn
 997                    (forward-line 1)
 998                    (looking-at "[0-9]+\t...")) ; More text after number.
 999                  (setq nntp-server-xover (car commands))))
1000           (setq commands (cdr commands)))
1001         ;; If none of the commands worked, we disable XOVER.
1002         (if (eq nntp-server-xover 'try)
1003             (save-excursion
1004               (set-buffer nntp-server-buffer)
1005               (erase-buffer)
1006               (setq nntp-server-xover nil)))
1007         nntp-server-xover))))
1008
1009 (defun nntp-send-strings-to-server (&rest strings)
1010   "Send list of STRINGS to news server as command and its arguments."
1011   (let ((cmd (concat (mapconcat 'identity strings " ") "\r\n")))
1012     ;; We open the nntp server if it is down.
1013     (or (nntp-server-opened nntp-current-server)
1014         (nntp-open-server nntp-current-server)
1015         (error (nntp-status-message)))
1016     ;; Send the strings.
1017     (process-send-string nntp-server-process cmd)))
1018
1019 (defun nntp-send-region-to-server (begin end)
1020   "Send current buffer region (from BEGIN to END) to news server."
1021   (save-excursion
1022     ;; We have to work in the buffer associated with NNTP server
1023     ;;  process because of NEmacs hack.
1024     (copy-to-buffer nntp-server-buffer begin end)
1025     (set-buffer nntp-server-buffer)
1026     (setq begin (point-min))
1027     (setq end (point-max))
1028     ;; `process-send-region' does not work if text to be sent is very
1029     ;;  large. I don't know maximum size of text sent correctly.
1030     (let ((last nil)
1031           (size 100))                   ;Size of text sent at once.
1032       (save-restriction
1033         (narrow-to-region begin end)
1034         (goto-char begin)
1035         (while (not (eobp))
1036           ;;(setq last (min end (+ (point) size)))
1037           ;; NEmacs gets confused if character at `last' is Kanji.
1038           (setq last (save-excursion
1039                        (goto-char (min end (+ (point) size)))
1040                        (or (eobp) (forward-char 1)) ;Adjust point
1041                        (point)))
1042           (process-send-region nntp-server-process (point) last)
1043           ;; I don't know whether the next codes solve the known
1044           ;;  problem of communication error of GNU Emacs.
1045           (accept-process-output)
1046           ;;(sit-for 0)
1047           (goto-char last))))
1048     ;; We cannot erase buffer, because reply may be received.
1049     (delete-region begin end)))
1050
1051 (defun nntp-open-server-semi-internal (server &optional service)
1052   "Open SERVER.
1053 If SERVER is nil, use value of environment variable `NNTPSERVER'.
1054 If SERVICE, this this as the port number."
1055   (let ((server (or server (getenv "NNTPSERVER")))
1056         (status nil)
1057         (timer
1058          (and nntp-connection-timeout
1059               (cond
1060                ((fboundp 'run-at-time)
1061                 (run-at-time nntp-connection-timeout
1062                              nil 'nntp-kill-connection server))
1063                ((fboundp 'start-itimer)
1064                 ;; Not sure if this will work or not, only one way to
1065                 ;; find out
1066                 (eval '(start-itimer "nntp-timeout"
1067                                      (lambda ()
1068                                        (nntp-kill-connection server))
1069                                      nntp-connection-timeout nil)))))))
1070     (save-excursion
1071       (set-buffer nntp-server-buffer)
1072       (setq nntp-status-string "")
1073       (message "nntp: Connecting to server on %s..." server)
1074       (cond ((and server (nntp-open-server-internal server service))
1075              (setq nntp-address server)
1076              (setq status
1077                    (condition-case nil
1078                        (nntp-wait-for-response "^[23].*\r?\n" 'slow)
1079                      (error nil)
1080                      (quit nil)))
1081              (or status (nntp-close-server-internal server))
1082              (and nntp-server-process
1083                   (progn
1084                     (set-process-sentinel
1085                      nntp-server-process 'nntp-default-sentinel)
1086                     ;; You can send commands at startup like AUTHINFO here.
1087                     ;; Added by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>
1088                     (run-hooks 'nntp-server-opened-hook))))
1089             ((null server)
1090              (setq nntp-status-string "NNTP server is not specified."))
1091             (t                          ; We couldn't open the server.
1092              (setq nntp-status-string
1093                    (buffer-substring (point-min) (point-max)))
1094              (setq nntp-timeout-servers (cons server nntp-timeout-servers))))
1095       (and timer (cancel-timer timer))
1096       (message "")
1097       (or status
1098           (setq nntp-current-server nil
1099                 nntp-async-number nil))
1100       status)))
1101
1102 (defun nntp-open-server-internal (server &optional service)
1103   "Open connection to news server on SERVER by SERVICE (default is nntp)."
1104   (let (proc)
1105     (save-excursion
1106       ;; Use TCP/IP stream emulation package if needed.
1107       (or (fboundp 'open-network-stream)
1108           (require 'tcp))
1109       ;; Initialize communication buffer.
1110       (nnheader-init-server-buffer)
1111       (set-buffer nntp-server-buffer)
1112       (if (setq proc
1113                 (condition-case nil
1114                     (funcall nntp-open-server-function server)
1115                   (error nil)))
1116           (progn
1117             (setq nntp-server-process proc)
1118             ;; Suggested by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
1119             (process-kill-without-query proc)
1120             (setq nntp-address server)
1121             ;; It is possible to change kanji-fileio-code in this hook.
1122             (run-hooks 'nntp-server-hook)
1123             (push proc nntp-opened-connections)
1124             nntp-server-process)))))
1125
1126 (defun nntp-open-network-stream (server)
1127   (open-network-stream
1128    "nntpd" nntp-server-buffer server nntp-port-number))
1129
1130 (defun nntp-open-rlogin (server)
1131   (let ((proc (start-process "nntpd" nntp-server-buffer "rsh" server)))
1132     (process-send-string proc (mapconcat 'identity nntp-rlogin-parameters
1133                                          " "))
1134     (process-send-string proc "\n")))
1135
1136 (defun nntp-telnet-to-machine ()
1137   (let (b)
1138     (telnet "localhost")
1139     (goto-char (point-min))
1140     (while (not (re-search-forward "^login: *" nil t))
1141       (sit-for 1)
1142       (goto-char (point-min)))
1143     (goto-char (point-max))
1144     (insert "larsi")
1145     (telnet-send-input)
1146     (setq b (point))
1147     (while (not (re-search-forward ">" nil t))
1148       (sit-for 1)
1149       (goto-char b))
1150     (goto-char (point-max))
1151     (insert "ls")
1152     (telnet-send-input)))
1153
1154 (defun nntp-close-server-internal (&optional server)
1155   "Close connection to news server."
1156   (nntp-possibly-change-server nil server)
1157   (if nntp-server-process
1158       (delete-process nntp-server-process))
1159   (setq nntp-server-process nil)
1160   (setq nntp-address ""))
1161
1162 (defun nntp-accept-response ()
1163   "Read response of server.
1164 It is well-known that the communication speed will be much improved by
1165 defining this function as macro."
1166   ;; To deal with server process exiting before
1167   ;;  accept-process-output is called.
1168   ;; Suggested by Jason Venner <jason@violet.berkeley.edu>.
1169   ;; This is a copy of `nntp-default-sentinel'.
1170   (let ((buf (current-buffer)))
1171     (prog1
1172         (if (or (not nntp-server-process)
1173                 (not (memq (process-status nntp-server-process) '(open run))))
1174             (error "nntp: Process connection closed; %s" (nntp-status-message))
1175           (if nntp-buggy-select
1176               (progn
1177                 ;; We cannot use `accept-process-output'.
1178                 ;; Fujitsu UTS requires messages during sleep-for.
1179                 ;; I don't know why.
1180                 (message "NNTP: Reading...")
1181                 (sleep-for 1)
1182                 (message ""))
1183             (condition-case errorcode
1184                 (accept-process-output nntp-server-process)
1185               (error
1186                (cond ((string-equal "select error: Invalid argument"
1187                                     (nth 1 errorcode))
1188                       ;; Ignore select error.
1189                       nil)
1190                      (t
1191                       (signal (car errorcode) (cdr errorcode))))))))
1192       (set-buffer buf))))
1193
1194 (defun nntp-last-element (list)
1195   "Return last element of LIST."
1196   (while (cdr list)
1197     (setq list (cdr list)))
1198   (car list))
1199
1200 (defun nntp-possibly-change-server (newsgroup server &optional connectionless)
1201   "Check whether the virtual server needs changing."
1202   (if (and server
1203            (not (nntp-server-opened server)))
1204       ;; This virtual server isn't open, so we (re)open it here.
1205       (nntp-open-server server nil t))
1206   (if (and newsgroup
1207            (not (equal newsgroup nntp-current-group)))
1208       ;; Set the proper current group.
1209       (nntp-request-group newsgroup server)))
1210
1211 (defun nntp-try-list-active (group)
1212   (nntp-list-active-group group)
1213   (save-excursion
1214     (set-buffer nntp-server-buffer)
1215     (goto-char (point-min))
1216     (cond ((looking-at "5[0-9]+")
1217            (setq nntp-server-list-active-group nil))
1218           (t
1219            (setq nntp-server-list-active-group t)))))
1220
1221 (defun nntp-async-server-opened ()
1222   (and nntp-async-process
1223        (memq (process-status nntp-async-process) '(open run))))
1224
1225 (defun nntp-async-open-server ()
1226   (save-excursion
1227     (set-buffer (generate-new-buffer " *async-nntp*"))
1228     (setq nntp-async-buffer (current-buffer))
1229     (buffer-disable-undo (current-buffer)))
1230   (let ((nntp-server-process nil)
1231         (nntp-server-buffer nntp-async-buffer))
1232     (nntp-open-server-semi-internal nntp-address nntp-port-number)
1233     (if (not (setq nntp-async-process nntp-server-process))
1234         (progn
1235           (setq nntp-async-number nil))
1236       (set-process-buffer nntp-async-process nntp-async-buffer))))
1237
1238 (defun nntp-async-fetch-articles (article)
1239   (if (stringp article)
1240       ()
1241     (let ((articles (cdr (memq (assq article nntp-async-articles)
1242                                nntp-async-articles)))
1243           (max (cond ((numberp nntp-async-number)
1244                       nntp-async-number)
1245                      ((eq nntp-async-number t)
1246                       (length nntp-async-articles))
1247                      (t 0)))
1248           nart)
1249       (while (and (>= (setq max (1- max)) 0)
1250                   articles)
1251         (or (memq (setq nart (car (car articles))) nntp-async-fetched)
1252             (progn
1253               (nntp-async-send-strings "ARTICLE " (int-to-string nart))
1254               (setq nntp-async-fetched (cons nart nntp-async-fetched))))
1255         (setq articles (cdr articles))))))
1256
1257 (defun nntp-async-send-strings (&rest strings)
1258   (let ((cmd (concat (mapconcat 'identity strings " ") "\r\n")))
1259     (or (nntp-async-server-opened)
1260         (nntp-async-open-server)
1261         (error (nntp-status-message)))
1262     (process-send-string nntp-async-process cmd)))
1263
1264 (defun nntp-async-request-group (group)
1265   (if (equal group nntp-current-group)
1266       ()
1267     (let ((asyncs (assoc group nntp-async-group-alist)))
1268       ;; A new group has been selected, so we push the current state
1269       ;; of async articles on an alist, and pull the old state off.
1270       (setq nntp-async-group-alist
1271             (cons (list nntp-current-group
1272                         nntp-async-articles nntp-async-fetched
1273                         nntp-async-process)
1274                   (delq asyncs nntp-async-group-alist)))
1275       (and asyncs
1276            (progn
1277              (setq nntp-async-articles (nth 1 asyncs))
1278              (setq nntp-async-fetched (nth 2 asyncs))
1279              (setq nntp-async-process (nth 3 asyncs)))))))
1280
1281 (provide 'nntp)
1282
1283 ;;; nntp.el ends here