summaryrefslogtreecommitdiff
path: root/lisp/dos-fns.el
blob: c66cbc7933a54462f3a993ee5e4d643a90f48777 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
;;; dos-fns.el --- MS-Dos specific functions

;; Copyright (C) 1991, 1993, 1995, 1996, 2001, 2002, 2003, 2004,
;;   2005, 2006, 2007 Free Software Foundation, Inc.

;; Maintainer: Morten Welinder <terra@diku.dk>
;; Keywords: internal

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; Part of this code is taken from (or derived from) demacs.

;;; Code:

;; This overrides a trivial definition in files.el.
(defun convert-standard-filename (filename)
  "Convert a standard file's name to something suitable for the current OS.
This means to guarantee valid names and perhaps to canonicalize
certain patterns.

On Windows and DOS, replace invalid characters.  On DOS, make
sure to obey the 8.3 limitations.  On Windows, turn Cygwin names
into native names, and also turn slashes into backslashes if the
shell requires it (see `w32-shell-dos-semantics')."
  (if (or (not (stringp filename))
	  ;; This catches the case where FILENAME is "x:" or "x:/" or
	  ;; "/", thus preventing infinite recursion.
	  (string-match "\\`\\([a-zA-Z]:\\)?[/\\]?\\'" filename))
      filename
    (let ((flen (length filename)))
      ;; If FILENAME has a trailing slash, remove it and recurse.
      (if (memq (aref filename (1- flen)) '(?/ ?\\))
	  (concat (convert-standard-filename
		   (substring filename 0 (1- flen)))
		  "/")
	(let* (;; ange-ftp gets in the way for names like "/foo:bar".
	       ;; We need to inhibit all magic file names, because
	       ;; remote file names should never be passed through
	       ;; this function, as they are not meant for the local
	       ;; filesystem!
	       (file-name-handler-alist nil)
	       (dir
		;; If FILENAME is "x:foo", file-name-directory returns
		;; "x:/bar/baz", substituting the current working
		;; directory on drive x:.  We want to be left with "x:"
		;; instead.
		(if (and (< 1 flen)
			 (eq (aref filename 1) ?:)
			 (null (string-match "[/\\]" filename)))
		    (substring filename 0 2)
		  (file-name-directory filename)))
	       (dlen-m-1 (1- (length dir)))
	       (string (copy-sequence (file-name-nondirectory filename)))
	       (lastchar (aref string (1- (length string))))
	       i firstdot)
	  (cond
	   ((msdos-long-file-names)
	    ;; Replace characters that are invalid even on Windows.
	    (while (setq i (string-match "[?*:<>|\"\000-\037]" string))
	      (aset string i ?!)))
	   ((not (member string '("" "." "..")))
	    ;; Change a leading period to a leading underscore.
	    (if (= (aref string 0) ?.)
		(aset string 0 ?_))
	    ;; If the name is longer than 8 chars, and doesn't have a
	    ;; period, and we have a dash or underscore that isn't too
	    ;; close to the beginning, change that to a period.  This
	    ;; is so we could salvage more characters of the original
	    ;; name by pushing them into the extension.
	    (if (and (not (string-match "\\." string))
		     (> (length string) 8)
		     ;; We don't gain anything if we put the period closer
		     ;; than 5 chars from the beginning (5 + 3 = 8).
		     (setq i (string-match "[-_]" string 5)))
		(aset string i ?\.))
	    ;; Get rid of invalid characters.
	    (while (setq i (string-match
			    "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]"
			    string))
	      (aset string i ?_))
	    ;; If we don't have a period in the first 8 chars, insert one.
	    ;; This enables to have 3 more characters from the original
	    ;; name in the extension.
	    (if (> (or (string-match "\\." string) (length string))
		   8)
		(setq string
		      (concat (substring string 0 8)
			      "."
			      (substring string 8))))
	    (setq firstdot (or (string-match "\\." string)
			       (1- (length string))))
	    ;; Truncate to 3 chars after the first period.
	    (if (> (length string) (+ firstdot 4))
		(setq string (substring string 0 (+ firstdot 4))))
	    ;; Change all periods except the first one into underscores.
	    ;; (DOS doesn't allow more than one period.)
	    (while (string-match "\\." string (1+ firstdot))
	      (setq i (string-match "\\." string (1+ firstdot)))
	      (aset string i ?_))
	    ;; If the last character of the original filename was `~' or `#',
	    ;; make sure the munged name ends with it also.  This is so that
	    ;; backup and auto-save files retain their telltale form.
	    (if (memq lastchar '(?~ ?#))
		(aset string (1- (length string)) lastchar))))
	  (concat (if (and (stringp dir)
			   (memq (aref dir dlen-m-1) '(?/ ?\\)))
		      (concat (convert-standard-filename
			       (substring dir 0 dlen-m-1))
			      "/")
		    (convert-standard-filename dir))
		  string))))))

(defun dos-8+3-filename (filename)
  "Truncate FILENAME to DOS 8+3 limits."
  (if (or (not (stringp filename))
	  (< (length filename) 5))	; too short to give any trouble
      filename
    (let ((flen (length filename)))
      ;; If FILENAME has a trailing slash, remove it and recurse.
      (if (memq (aref filename (1- flen)) '(?/ ?\\))
	  (concat (dos-8+3-filename (substring filename 0 (1- flen)))
		  "/")
	(let* (;; ange-ftp gets in the way for names like "/foo:bar".
	       ;; We need to inhibit all magic file names, because
	       ;; remote file names should never be passed through
	       ;; this function, as they are not meant for the local
	       ;; filesystem!
	       (file-name-handler-alist nil)
	       (dir
		;; If FILENAME is "x:foo", file-name-directory returns
		;; "x:/bar/baz", substituting the current working
		;; directory on drive x:.  We want to be left with "x:"
		;; instead.
		(if (and (< 1 flen)
			 (eq (aref filename 1) ?:)
			 (null (string-match "[/\\]" filename)))
		    (substring filename 0 2)
		  (file-name-directory filename)))
	       (dlen-m-1 (1- (length dir)))
	       (string (copy-sequence (file-name-nondirectory filename)))
	       (strlen (length string))
	       (lastchar (aref string (1- strlen)))
	       i firstdot)
	  (setq firstdot (string-match "\\." string))
	  (cond
	   (firstdot
	    ;; Truncate the extension to 3 characters.
	    (if (> strlen (+ firstdot 4))
		(setq string (substring string 0 (+ firstdot 4))))
	    ;; Truncate the basename to 8 characters.
	    (if (> firstdot 8)
		(setq string (concat (substring string 0 8)
				     "."
				     (substring string (1+ firstdot))))))
	   ((> strlen 8)
	    ;; No dot; truncate file name to 8 characters.
	    (setq string (substring string 0 8))))
	  ;; If the last character of the original filename was `~',
	  ;; make sure the munged name ends with it also.  This is so
	  ;; a backup file retains its final `~'.
	  (if (equal lastchar ?~)
	      (aset string (1- (length string)) lastchar))
	  (concat (if (and (stringp dir)
			   (memq (aref dir dlen-m-1) '(?/ ?\\)))
		      (concat (dos-8+3-filename (substring dir 0 dlen-m-1))
			      "/")
		    ;; Recurse to truncate the leading directories.
		    (dos-8+3-filename dir))
		  string))))))

;; See dos-vars.el for defcustom.
(defvar msdos-shells)

;;; Override setting chosen at startup.
(defun set-default-process-coding-system ()
  (setq default-process-coding-system
	(if default-enable-multibyte-characters
	    '(undecided-dos . undecided-dos)
	  '(raw-text-dos . raw-text-dos))))

(add-hook 'before-init-hook 'set-default-process-coding-system)

(defvar register-name-alist
  '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5)
    (cflag . 6) (flags . 7)
    (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0))
    (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1))))

(defun make-register ()
  (make-vector 8 0))

(defun register-value (regs name)
  (let ((where (cdr (assoc name register-name-alist))))
    (cond ((consp where)
	   (let ((tem (aref regs (car where))))
	     (if (zerop (cdr where))
		 (% tem 256)
	       (/ tem 256))))
	  ((numberp where)
	   (aref regs where))
	  (t nil))))

(defun set-register-value (regs name value)
  (and (numberp value)
       (>= value 0)
       (let ((where (cdr (assoc name register-name-alist))))
	 (cond ((consp where)
		(let ((tem (aref regs (car where)))
		      (value (logand value 255)))
		  (aset regs
			(car where)
			(if (zerop (cdr where))
			    (logior (logand tem 65280) value)
			  (logior (logand tem 255) (lsh value 8))))))
	       ((numberp where)
		(aset regs where (logand value 65535))))))
  regs)

(defsubst intdos (regs)
  (int86 33 regs))

;; Backward compatibility for obsolescent functions which
;; set screen size.

(defun mode25 ()
  "Changes the number of screen rows to 25."
  (interactive)
  (set-frame-size (selected-frame) 80 25))

(defun mode4350 ()
  "Changes the number of rows to 43 or 50.
Emacs always tries to set the screen height to 50 rows first.
If this fails, it will try to set it to 43 rows, on the assumption
that your video hardware might not support 50-line mode."
  (interactive)
  (set-frame-size (selected-frame) 80 50)
  (if (eq (frame-height (selected-frame)) 50)
      nil  ; the original built-in function returned nil
    (set-frame-size (selected-frame) 80 43)))

(provide 'dos-fns)

;;; arch-tag: 00b03579-8ebb-4a02-8762-5c5a929774ad
;;; dos-fns.el ends here