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1 ;;; telnet.el --- run a telnet session from within an Emacs buffer
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3 ;;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
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5 ;; Author: William F. Schelter
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6 ;; Keywords: comm, unix
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7 ;; Maintainer: FSF
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Synched up with: FSF 19.34.
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27
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28 ;;; Commentary:
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29
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30 ;; This mode is intended to be used for telnet or rsh to a remode host;
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31 ;; `telnet' and `rsh' are the two entry points. Multiple telnet or rsh
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32 ;; sessions are supported.
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33 ;;
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34 ;; Normally, input is sent to the remote telnet/rsh line-by-line, as you
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35 ;; type RET or LFD. C-c C-c sends a C-c to the remote immediately;
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36 ;; C-c C-z sends C-z immediately. C-c C-q followed by any character
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37 ;; sends that character immediately.
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38 ;;
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39 ;; All RET characters are filtered out of the output coming back from the
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40 ;; remote system. The mode tries to do other useful translations based
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41 ;; on what it sees coming back from the other system before the password
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42 ;; query. It knows about UNIX, ITS, TOPS-20 and Explorer systems.
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43
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44 ;;; Code:
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45
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46 ;; to do fix software types for lispm:
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47 ;; to eval current expression. Also to try to send escape keys correctly.
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48 ;; essentially we'll want the rubout-handler off.
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49
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50 ;; filter is simplistic but should be okay for typical shell usage.
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51 ;; needs hacking if it is going to deal with asynchronous output in a sane
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52 ;; manner
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53
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54 (require 'comint)
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55
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56 (defvar telnet-new-line "\r")
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57 (defvar telnet-mode-map nil)
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58 (defvar telnet-default-prompt-pattern "^[^#$%>\n]*[#$%>] *")
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59 (defvar telnet-prompt-pattern telnet-default-prompt-pattern)
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60
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61 (defvar telnet-replace-c-g nil)
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62 (make-variable-buffer-local
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63 (defvar telnet-remote-echoes t
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64 "True if the telnet process will echo input."))
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65 (make-variable-buffer-local
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66 (defvar telnet-interrupt-string "\C-c" "String sent by C-c."))
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67
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68 (defvar telnet-count 0
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69 "Number of output strings read from the telnet process
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70 while looking for the initial password.")
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71 (make-variable-buffer-local 'telnet-count)
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72
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73 (defvar telnet-program "telnet"
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74 "Program to run to open a telnet connection.")
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75
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76 (defvar telnet-initial-count -50
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77 "Initial value of `telnet-count'. Should be set to the negative of the
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78 number of terminal writes telnet will make setting up the host connection.")
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79
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80 (defvar telnet-maximum-count 4
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81 "Maximum value `telnet-count' can have.
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82 After this many passes, we stop looking for initial setup data.
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83 Should be set to the number of terminal writes telnet will make
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84 rejecting one login and prompting again for a username and password.")
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85
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86 (defun telnet-interrupt-subjob ()
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87 (interactive)
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88 "Interrupt the program running through telnet on the remote host."
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89 (process-send-string nil telnet-interrupt-string))
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90
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91 (defun telnet-c-z ()
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92 (interactive)
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93 (process-send-string nil "\C-z"))
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94
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95 ;; XEmacs change (Keep telnet- prefix)
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96 (defun telnet-send-process-next-char ()
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97 (interactive)
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98 (process-send-string nil
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99 (char-to-string
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100 (let ((inhibit-quit t))
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101 (prog1 (read-char)
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102 (setq quit-flag nil))))))
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103
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104 ; initialization on first load.
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105 (if telnet-mode-map
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106 nil
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107 ;; FSF
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108 ;; (setq telnet-mode-map (nconc (make-sparse-keymap) comint-mode-map))
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109 (setq telnet-mode-map (make-sparse-keymap))
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110 (set-keymap-parents telnet-mode-map (list comint-mode-map))
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111 (define-key telnet-mode-map "\C-m" 'telnet-send-input)
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112 ; (define-key telnet-mode-map "\C-j" 'telnet-send-input)
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113 (define-key telnet-mode-map "\C-c\C-q" 'send-process-next-char)
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114 (define-key telnet-mode-map "\C-c\C-c" 'telnet-interrupt-subjob)
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115 (define-key telnet-mode-map "\C-c\C-z" 'telnet-c-z))
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116
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117 ;;maybe should have a flag for when have found type
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118 (defun telnet-check-software-type-initialize (string)
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119 "Tries to put correct initializations in. Needs work."
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120 (let ((case-fold-search t))
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121 (cond ((string-match "unix" string)
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122 (setq telnet-prompt-pattern comint-prompt-regexp)
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123 (setq telnet-new-line "\n"))
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124 ((string-match "tops-20" string) ;;maybe add telnet-replace-c-g
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125 (setq telnet-prompt-pattern "[@>] *"))
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126 ((string-match "its" string)
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127 (setq telnet-prompt-pattern "^[^*>\n]*[*>] *"))
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128 ((string-match "explorer" string) ;;explorer telnet needs work
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129 (setq telnet-replace-c-g ?\n))
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130 (t
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131 (setq telnet-prompt-pattern telnet-default-prompt-pattern))))
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132 (setq comint-prompt-regexp telnet-prompt-pattern))
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133
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134 (defun telnet-initial-filter (proc string)
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135 ;For reading up to and including password; also will get machine type.
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136 (cond ((string-match "No such host" string)
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137 (kill-buffer (process-buffer proc))
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138 (error "No such host."))
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139 ((string-match "passw" string)
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140 (telnet-filter proc string)
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141 (let ((password (comint-read-noecho "Password: " t)))
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142 (setq telnet-count 0)
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143 (process-send-string proc (concat password telnet-new-line))))
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144 (t (telnet-check-software-type-initialize string)
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145 (telnet-filter proc string)
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146 (cond ((> telnet-count telnet-maximum-count)
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147 ;; (set-process-filter proc 'telnet-filter)
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148 ;; Kludge for shell-fonts -- this is the only mode that
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149 ;; actually changes what its process filter is at run time,
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150 ;; which confuses shell-font. So we special-case that here.
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151 ;; #### Danger, knows an internal shell-font variable name.
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152 (let ((old-filter (process-filter proc)))
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153 (if (eq old-filter 'shell-font-process-filter)
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154 (set (make-local-variable 'shell-font-process-filter)
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155 'telnet-filter)
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156 (set-process-filter proc 'telnet-filter))))
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157 (t (setq telnet-count (1+ telnet-count)))))))
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158
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159 ;; Identical to comint-simple-send, except that it sends telnet-new-line
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160 ;; instead of "\n".
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161 (defun telnet-simple-send (proc string)
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162 (comint-send-string proc string)
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163 (comint-send-string proc telnet-new-line))
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164
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165 (defun telnet-filter (proc string)
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166 (save-excursion
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167 (set-buffer (process-buffer proc))
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168 (save-match-data
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169 (let* ((last-insertion (marker-position (process-mark proc)))
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170 (delta (- (point) last-insertion))
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171 (ie (and comint-last-input-end
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172 (marker-position comint-last-input-end)))
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173 (w (get-buffer-window (current-buffer)))
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174 (ws (and w (window-start w))))
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175 (goto-char last-insertion)
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176 ;; Insert STRING, omitting all C-m characters.
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177 (insert-before-markers string)
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178 (set-marker (process-mark proc) (point))
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179 ;; the insert-before-markers may have screwed window-start
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180 ;; and likely moved comint-last-input-end. This is why the
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181 ;; insertion-reaction should be a property of markers, not
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182 ;; of the function which does the inserting.
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183 (if ws (set-window-start w ws t))
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184 (if ie (set-marker comint-last-input-end ie))
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185 (while (progn (skip-chars-backward "^\C-m" last-insertion)
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186 (> (point) last-insertion))
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187 (delete-region (1- (point)) (point)))
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188 (goto-char (process-mark proc))
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189 (and telnet-replace-c-g
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190 (subst-char-in-region last-insertion (point) ?\C-g
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191 telnet-replace-c-g t))
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192 ;; If point is after the insertion place, move it
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193 ;; along with the text.
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194 (if (> delta 0)
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195 (goto-char (+ (process-mark proc) delta)))))))
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196
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197 (defun telnet-send-input ()
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198 (interactive)
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199 (let ((proc (get-buffer-process (current-buffer)))
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200 p1 p2)
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201 (if (and telnet-remote-echoes
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202 (>= (point) (process-mark proc)))
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203 (save-excursion
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204 (if comint-eol-on-send (end-of-line))
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205 (setq p1 (marker-position (process-mark proc))
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206 p2 (point))))
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207 (prog1
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208 (comint-send-input)
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209 ;; at this point, comint-send-input has moved the process mark, inserted
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210 ;; a newline, and possibly inserted the (echoed) output. If the host is
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211 ;; in remote-echo mode, then delete our local copy of the command, and
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212 ;; the newline that comint-send-input sent.
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213 (if p1
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214 (delete-region p1 (1+ p2))))))
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215
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216 ;;;###autoload (add-hook 'same-window-regexps "\\*telnet-.*\\*\\(\\|<[0-9]+>\\)")
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217
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218 ;;;###autoload
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219 (defun telnet (host &optional port)
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220 "Open a network login connection to host named HOST (a string).
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221 With a prefix argument, prompts for the port name or number as well.
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222 Communication with HOST is recorded in a buffer `*HOST-telnet*'.
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223 Normally input is edited in Emacs and sent a line at a time.
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224 See also `\\[rsh]'."
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225 (interactive (list (read-string "Open telnet connection to host: ")
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226 (if current-prefix-arg
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227 (read-string "Port name or number: ")
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228 nil)))
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229 (let* ((comint-delimiter-argument-list '(?\ ?\t))
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230 (name (concat "telnet-" (comint-arguments host 0 nil)
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231 (if port (concat "/" port) "")))
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232 (buffer (get-buffer (concat "*" name "*")))
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233 process)
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234 (if (and buffer (get-buffer-process buffer))
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235 (pop-to-buffer buffer)
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236 (pop-to-buffer (make-comint name telnet-program))
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237 (setq process (get-buffer-process (current-buffer)))
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238 (set-process-filter process 'telnet-initial-filter)
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239
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240 ;; SunOS and IRIX don't print "unix" in their rsh or telnet
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241 ;; login banners, so let's get a reasonable default here.
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242 ;; #### This patch from jwz mimics what is done in rsh done
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243 ;; below. However, it (along with the one in rsh) mean that
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244 ;; telnet-check-software-type-initialize is effectively a
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245 ;; wastoid function. Reworking it like it claims to need is
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246 ;; probably the better solution but I'm not going to do it.
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247 ;; --cet
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248 (telnet-check-software-type-initialize "unix")
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249
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250 ;; Don't send the `open' cmd till telnet is ready for it.
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251 (accept-process-output process)
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252 (erase-buffer)
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253 (process-send-string process (concat "open " host
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254 (if port (concat " " port) "")
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255 "\n"))
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256 (setq comint-input-sender 'telnet-simple-send)
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257 (setq telnet-count telnet-initial-count)
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258 ;; run last so that hooks can change things.
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259 (telnet-mode))))
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260
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261 (defun telnet-mode ()
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262 "This mode is for using telnet (or rsh) from a buffer to another host.
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263 It has most of the same commands as comint-mode.
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264 There is a variable ``telnet-interrupt-string'' which is the character
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265 sent to try to stop execution of a job on the remote host.
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266 Data is sent to the remote host when RET is typed.
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267
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268 \\{telnet-mode-map}
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269 "
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270 (interactive)
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271 (comint-mode)
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272 (setq major-mode 'telnet-mode
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273 mode-name "Telnet"
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274 comint-prompt-regexp telnet-prompt-pattern)
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275 (use-local-map telnet-mode-map)
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276 (run-hooks 'telnet-mode-hook))
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277
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278 ;;;###autoload (add-hook 'same-window-regexps "\\*rsh-[^-]*\\*\\(\\|<[0-9]*>\\)")
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279
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280 ;; Berkeley spawn of hell
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281 ;;;###autoload
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282 (defun rsh (host)
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283 "Open a network login connection to host named HOST (a string).
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284 Communication with HOST is recorded in a buffer `*rsh-HOST*'.
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285 Normally input is edited in Emacs and sent a line at a time.
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286 See also `\\[telnet]'."
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287 (interactive "sOpen rsh connection to host: ")
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288 (require 'shell)
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289 (let ((name (concat "rsh-" host)))
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290 (pop-to-buffer (make-comint name remote-shell-program nil host))
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291 (setq telnet-count telnet-initial-count)
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292 ;;
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293 ;; SunOS doesn't print "unix" in its rsh login banner, so let's get a
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294 ;; reasonable default here. There do exist non-Unix machines which
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295 ;; speak the rsh protocol, but let's hope they print their OS name
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296 ;; when one connects.
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297 ;;
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298 (telnet-check-software-type-initialize "unix")
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299 ;;
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300 ;; I think we should use telnet-filter here instead of -initial-filter,
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301 ;; because rsh generally doesn't prompt for a password, and gobbling the
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302 ;; first line that contains "passw" is extremely antisocial. More
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303 ;; antisocial than echoing a password, and more likely than connecting
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304 ;; to a non-Unix rsh host these days...
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305 ;;
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306 ;; (set-process-filter (get-process name) 'telnet-initial-filter)
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307 (set-process-filter (get-process name) 'telnet-filter)
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308 ;; run last so that hooks can change things.
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309 (telnet-mode)))
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310
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311 (provide 'telnet)
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312
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313 ;;; telnet.el ends here
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