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e8af40ee | 1 | ;;; dos-fns.el --- MS-Dos specific functions |
007c61fa | 2 | |
597e2240 | 3 | ;; Copyright (C) 1991, 1993, 1995, 1996, 2001, 2002, 2003, 2004, 2005, |
5df4f04c | 4 | ;; 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
007c61fa | 5 | |
0acdb863 | 6 | ;; Maintainer: Morten Welinder <terra@diku.dk> |
007c61fa | 7 | ;; Keywords: internal |
bd78fa1d | 8 | ;; Package: emacs |
007c61fa RS |
9 | |
10 | ;; This file is part of GNU Emacs. | |
11 | ||
eb3fa2cf | 12 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
007c61fa | 13 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
14 | ;; the Free Software Foundation, either version 3 of the License, or |
15 | ;; (at your option) any later version. | |
007c61fa RS |
16 | |
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
eb3fa2cf | 23 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
007c61fa RS |
24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;; Part of this code is taken from (or derived from) demacs. | |
28 | ||
29 | ;;; Code: | |
30 | ||
6769db50 | 31 | (declare-function int86 "dosfns.c") |
73e6adaa DN |
32 | (declare-function msdos-long-file-names "msdos.c") |
33 | ||
98d8b17e | 34 | ;; See convert-standard-filename in files.el. |
5a70d10f | 35 | (defun dos-convert-standard-filename (filename) |
98d8b17e | 36 | "Convert a standard file's name to something suitable for MS-DOS. |
915b0bf0 JB |
37 | This means to guarantee valid names and perhaps to canonicalize |
38 | certain patterns. | |
39 | ||
98d8b17e EZ |
40 | This function is called by `convert-standard-filename'. |
41 | ||
915b0bf0 | 42 | On Windows and DOS, replace invalid characters. On DOS, make |
98d8b17e | 43 | sure to obey the 8.3 limitations." |
09def38b | 44 | (if (or (not (stringp filename)) |
9d47450f EZ |
45 | ;; This catches the case where FILENAME is "x:" or "x:/" or |
46 | ;; "/", thus preventing infinite recursion. | |
47 | (string-match "\\`\\([a-zA-Z]:\\)?[/\\]?\\'" filename)) | |
9c777199 | 48 | filename |
9d47450f EZ |
49 | (let ((flen (length filename))) |
50 | ;; If FILENAME has a trailing slash, remove it and recurse. | |
51 | (if (memq (aref filename (1- flen)) '(?/ ?\\)) | |
5a70d10f | 52 | (concat (dos-convert-standard-filename |
9d47450f EZ |
53 | (substring filename 0 (1- flen))) |
54 | "/") | |
55 | (let* (;; ange-ftp gets in the way for names like "/foo:bar". | |
56 | ;; We need to inhibit all magic file names, because | |
57 | ;; remote file names should never be passed through | |
58 | ;; this function, as they are not meant for the local | |
59 | ;; filesystem! | |
60 | (file-name-handler-alist nil) | |
61 | (dir | |
62 | ;; If FILENAME is "x:foo", file-name-directory returns | |
63 | ;; "x:/bar/baz", substituting the current working | |
64 | ;; directory on drive x:. We want to be left with "x:" | |
65 | ;; instead. | |
66 | (if (and (< 1 flen) | |
67 | (eq (aref filename 1) ?:) | |
68 | (null (string-match "[/\\]" filename))) | |
69 | (substring filename 0 2) | |
70 | (file-name-directory filename))) | |
71 | (dlen-m-1 (1- (length dir))) | |
72 | (string (copy-sequence (file-name-nondirectory filename))) | |
73 | (lastchar (aref string (1- (length string)))) | |
74 | i firstdot) | |
75 | (cond | |
76 | ((msdos-long-file-names) | |
09def38b EZ |
77 | ;; Replace characters that are invalid even on Windows. |
78 | (while (setq i (string-match "[?*:<>|\"\000-\037]" string)) | |
9d47450f EZ |
79 | (aset string i ?!))) |
80 | ((not (member string '("" "." ".."))) | |
81 | ;; Change a leading period to a leading underscore. | |
82 | (if (= (aref string 0) ?.) | |
83 | (aset string 0 ?_)) | |
a007e4e3 EZ |
84 | ;; If the name is longer than 8 chars, and doesn't have a |
85 | ;; period, and we have a dash or underscore that isn't too | |
86 | ;; close to the beginning, change that to a period. This | |
87 | ;; is so we could salvage more characters of the original | |
88 | ;; name by pushing them into the extension. | |
89 | (if (and (not (string-match "\\." string)) | |
90 | (> (length string) 8) | |
91 | ;; We don't gain anything if we put the period closer | |
92 | ;; than 5 chars from the beginning (5 + 3 = 8). | |
93 | (setq i (string-match "[-_]" string 5))) | |
94 | (aset string i ?\.)) | |
9d47450f EZ |
95 | ;; Get rid of invalid characters. |
96 | (while (setq i (string-match | |
97 | "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]" | |
98 | string)) | |
99 | (aset string i ?_)) | |
9d47450f | 100 | ;; If we don't have a period in the first 8 chars, insert one. |
a007e4e3 EZ |
101 | ;; This enables to have 3 more characters from the original |
102 | ;; name in the extension. | |
9d47450f EZ |
103 | (if (> (or (string-match "\\." string) (length string)) |
104 | 8) | |
105 | (setq string | |
106 | (concat (substring string 0 8) | |
107 | "." | |
108 | (substring string 8)))) | |
109 | (setq firstdot (or (string-match "\\." string) | |
110 | (1- (length string)))) | |
111 | ;; Truncate to 3 chars after the first period. | |
112 | (if (> (length string) (+ firstdot 4)) | |
113 | (setq string (substring string 0 (+ firstdot 4)))) | |
114 | ;; Change all periods except the first one into underscores. | |
a007e4e3 | 115 | ;; (DOS doesn't allow more than one period.) |
9d47450f EZ |
116 | (while (string-match "\\." string (1+ firstdot)) |
117 | (setq i (string-match "\\." string (1+ firstdot))) | |
118 | (aset string i ?_)) | |
a007e4e3 EZ |
119 | ;; If the last character of the original filename was `~' or `#', |
120 | ;; make sure the munged name ends with it also. This is so that | |
121 | ;; backup and auto-save files retain their telltale form. | |
122 | (if (memq lastchar '(?~ ?#)) | |
9d47450f EZ |
123 | (aset string (1- (length string)) lastchar)))) |
124 | (concat (if (and (stringp dir) | |
125 | (memq (aref dir dlen-m-1) '(?/ ?\\))) | |
5a70d10f | 126 | (concat (dos-convert-standard-filename |
9d47450f EZ |
127 | (substring dir 0 dlen-m-1)) |
128 | "/") | |
5a70d10f | 129 | (dos-convert-standard-filename dir)) |
9d47450f | 130 | string)))))) |
44998f5b | 131 | |
51f32106 | 132 | (defun dos-8+3-filename (filename) |
a9d36252 EZ |
133 | "Truncate FILENAME to DOS 8+3 limits." |
134 | (if (or (not (stringp filename)) | |
135 | (< (length filename) 5)) ; too short to give any trouble | |
136 | filename | |
137 | (let ((flen (length filename))) | |
138 | ;; If FILENAME has a trailing slash, remove it and recurse. | |
139 | (if (memq (aref filename (1- flen)) '(?/ ?\\)) | |
51f32106 | 140 | (concat (dos-8+3-filename (substring filename 0 (1- flen))) |
a9d36252 EZ |
141 | "/") |
142 | (let* (;; ange-ftp gets in the way for names like "/foo:bar". | |
143 | ;; We need to inhibit all magic file names, because | |
144 | ;; remote file names should never be passed through | |
145 | ;; this function, as they are not meant for the local | |
146 | ;; filesystem! | |
147 | (file-name-handler-alist nil) | |
148 | (dir | |
149 | ;; If FILENAME is "x:foo", file-name-directory returns | |
150 | ;; "x:/bar/baz", substituting the current working | |
151 | ;; directory on drive x:. We want to be left with "x:" | |
152 | ;; instead. | |
153 | (if (and (< 1 flen) | |
154 | (eq (aref filename 1) ?:) | |
155 | (null (string-match "[/\\]" filename))) | |
156 | (substring filename 0 2) | |
157 | (file-name-directory filename))) | |
158 | (dlen-m-1 (1- (length dir))) | |
159 | (string (copy-sequence (file-name-nondirectory filename))) | |
160 | (strlen (length string)) | |
161 | (lastchar (aref string (1- strlen))) | |
162 | i firstdot) | |
163 | (setq firstdot (string-match "\\." string)) | |
164 | (cond | |
165 | (firstdot | |
166 | ;; Truncate the extension to 3 characters. | |
167 | (if (> strlen (+ firstdot 4)) | |
168 | (setq string (substring string 0 (+ firstdot 4)))) | |
169 | ;; Truncate the basename to 8 characters. | |
170 | (if (> firstdot 8) | |
171 | (setq string (concat (substring string 0 8) | |
172 | "." | |
173 | (substring string (1+ firstdot)))))) | |
174 | ((> strlen 8) | |
175 | ;; No dot; truncate file name to 8 characters. | |
176 | (setq string (substring string 0 8)))) | |
177 | ;; If the last character of the original filename was `~', | |
178 | ;; make sure the munged name ends with it also. This is so | |
179 | ;; a backup file retains its final `~'. | |
180 | (if (equal lastchar ?~) | |
181 | (aset string (1- (length string)) lastchar)) | |
182 | (concat (if (and (stringp dir) | |
183 | (memq (aref dir dlen-m-1) '(?/ ?\\))) | |
51f32106 | 184 | (concat (dos-8+3-filename (substring dir 0 dlen-m-1)) |
a9d36252 EZ |
185 | "/") |
186 | ;; Recurse to truncate the leading directories. | |
51f32106 | 187 | (dos-8+3-filename dir)) |
a9d36252 EZ |
188 | string)))))) |
189 | ||
2e480e42 EZ |
190 | ;; This is for the sake of standard file names elsewhere in Emacs that |
191 | ;; are defined as constant strings or via defconst, and whose | |
5a70d10f | 192 | ;; conversion via `dos-convert-standard-filename' does not give good |
2e480e42 EZ |
193 | ;; enough results. |
194 | (defun dosified-file-name (file-name) | |
195 | "Return a variant of FILE-NAME that is valid on MS-DOS filesystems. | |
196 | ||
5a70d10f | 197 | This function is for those rare cases where `dos-convert-standard-filename' |
2e480e42 EZ |
198 | does not do a job that is good enough, e.g. if you need to preserve the |
199 | file-name extension. It recognizes only certain specific file names | |
200 | that are used in Emacs Lisp sources; any other file name will be | |
201 | returned unaltered." | |
202 | (cond | |
203 | ;; See files.el:dir-locals-file. | |
204 | ((string= file-name ".dir-locals.el") | |
205 | "_dir-locals.el") | |
206 | (t | |
207 | file-name))) | |
208 | ||
feb65403 RS |
209 | ;; See dos-vars.el for defcustom. |
210 | (defvar msdos-shells) | |
007c61fa | 211 | |
0c5f6aca | 212 | ;; Override settings chosen at startup. |
5a70d10f | 213 | (defun dos-set-default-process-coding-system () |
224116b8 | 214 | (setq default-process-coding-system |
597e2240 | 215 | (if (default-value 'enable-multibyte-characters) |
224116b8 AI |
216 | '(undecided-dos . undecided-dos) |
217 | '(raw-text-dos . raw-text-dos)))) | |
218 | ||
5a70d10f | 219 | (add-hook 'before-init-hook 'dos-set-default-process-coding-system) |
224116b8 | 220 | |
0c5f6aca EZ |
221 | ;; File names defined in preloaded packages can be incorrect or |
222 | ;; invalid if long file names were available during dumping, but not | |
e6f174da EZ |
223 | ;; at runtime, or vice versa, and if the default file name begins with |
224 | ;; a period. Their defcustom's need to be reevaluated at startup. To | |
225 | ;; see if the list of defcustom's below is up to date, run the command | |
226 | ;; "M-x apropos-value RET ~/\. RET". | |
0c5f6aca | 227 | (defun dos-reevaluate-defcustoms () |
36b434ee EZ |
228 | ;; This is not needed in Emacs 23.2 and later, as trash-directory is |
229 | ;; initialized as nil. But something like this might become | |
230 | ;; necessary in the future, so I'm keeping it here as a reminder. | |
231 | ;(custom-reevaluate-setting 'trash-directory) | |
232 | ) | |
0c5f6aca EZ |
233 | |
234 | (add-hook 'before-init-hook 'dos-reevaluate-defcustoms) | |
235 | ||
5a70d10f | 236 | (defvar dos-register-name-alist |
007c61fa | 237 | '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5) |
21f2acd3 RS |
238 | (cflag . 6) (flags . 7) |
239 | (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0)) | |
240 | (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1)))) | |
007c61fa | 241 | |
98d8b17e EZ |
242 | (define-obsolete-variable-alias |
243 | 'register-name-alist 'dos-register-name-alist "24.1") | |
244 | ||
5a70d10f | 245 | (defun dos-make-register () |
007c61fa RS |
246 | (make-vector 8 0)) |
247 | ||
98d8b17e EZ |
248 | (define-obsolete-function-alias 'make-register 'dos-make-register "24.1") |
249 | ||
5a70d10f SM |
250 | (defun dos-register-value (regs name) |
251 | (let ((where (cdr (assoc name dos-register-name-alist)))) | |
007c61fa RS |
252 | (cond ((consp where) |
253 | (let ((tem (aref regs (car where)))) | |
254 | (if (zerop (cdr where)) | |
255 | (% tem 256) | |
256 | (/ tem 256)))) | |
257 | ((numberp where) | |
258 | (aref regs where)) | |
259 | (t nil)))) | |
260 | ||
98d8b17e EZ |
261 | (define-obsolete-function-alias 'register-value 'dos-register-value "24.1") |
262 | ||
5a70d10f | 263 | (defun dos-set-register-value (regs name value) |
007c61fa | 264 | (and (numberp value) |
21f2acd3 | 265 | (>= value 0) |
5a70d10f | 266 | (let ((where (cdr (assoc name dos-register-name-alist)))) |
007c61fa | 267 | (cond ((consp where) |
21f2acd3 RS |
268 | (let ((tem (aref regs (car where))) |
269 | (value (logand value 255))) | |
270 | (aset regs | |
271 | (car where) | |
272 | (if (zerop (cdr where)) | |
273 | (logior (logand tem 65280) value) | |
274 | (logior (logand tem 255) (lsh value 8)))))) | |
007c61fa | 275 | ((numberp where) |
21f2acd3 | 276 | (aset regs where (logand value 65535)))))) |
007c61fa RS |
277 | regs) |
278 | ||
98d8b17e EZ |
279 | (define-obsolete-function-alias |
280 | 'set-register-value 'dos-set-register-value "24.1") | |
281 | ||
5a70d10f | 282 | (defsubst dos-intdos (regs) |
98d8b17e EZ |
283 | "Issue the DOS Int 21h with registers REGS. |
284 | ||
285 | REGS should be a vector produced by `dos-make-register' | |
286 | and `dos-set-register-value', which see." | |
007c61fa RS |
287 | (int86 33 regs)) |
288 | ||
98d8b17e EZ |
289 | (define-obsolete-function-alias 'intdos 'dos-intdos "24.1") |
290 | ||
70662974 RS |
291 | ;; Backward compatibility for obsolescent functions which |
292 | ;; set screen size. | |
293 | ||
5a70d10f | 294 | (defun dos-mode25 () |
70662974 RS |
295 | "Changes the number of screen rows to 25." |
296 | (interactive) | |
297 | (set-frame-size (selected-frame) 80 25)) | |
298 | ||
98d8b17e EZ |
299 | (define-obsolete-function-alias 'mode25 'dos-mode25 "24.1") |
300 | ||
5a70d10f | 301 | (defun dos-mode4350 () |
70662974 RS |
302 | "Changes the number of rows to 43 or 50. |
303 | Emacs always tries to set the screen height to 50 rows first. | |
304 | If this fails, it will try to set it to 43 rows, on the assumption | |
305 | that your video hardware might not support 50-line mode." | |
306 | (interactive) | |
307 | (set-frame-size (selected-frame) 80 50) | |
308 | (if (eq (frame-height (selected-frame)) 50) | |
309 | nil ; the original built-in function returned nil | |
310 | (set-frame-size (selected-frame) 80 43))) | |
311 | ||
98d8b17e EZ |
312 | (define-obsolete-function-alias 'mode4350 'dos-mode4350 "24.1") |
313 | ||
868c7abd RS |
314 | (provide 'dos-fns) |
315 | ||
e8af40ee | 316 | ;;; dos-fns.el ends here |