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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, |
114f9c96 | 4 | ;; 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
007c61fa | 5 | |
0acdb863 | 6 | ;; Maintainer: Morten Welinder <terra@diku.dk> |
007c61fa RS |
7 | ;; Keywords: internal |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
eb3fa2cf | 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
007c61fa | 12 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
13 | ;; the Free Software Foundation, either version 3 of the License, or |
14 | ;; (at your option) any later version. | |
007c61fa RS |
15 | |
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
eb3fa2cf | 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
007c61fa RS |
23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;; Part of this code is taken from (or derived from) demacs. | |
27 | ||
28 | ;;; Code: | |
29 | ||
6769db50 | 30 | (declare-function int86 "dosfns.c") |
73e6adaa DN |
31 | (declare-function msdos-long-file-names "msdos.c") |
32 | ||
98d8b17e | 33 | ;; See convert-standard-filename in files.el. |
5a70d10f | 34 | (defun dos-convert-standard-filename (filename) |
98d8b17e | 35 | "Convert a standard file's name to something suitable for MS-DOS. |
915b0bf0 JB |
36 | This means to guarantee valid names and perhaps to canonicalize |
37 | certain patterns. | |
38 | ||
98d8b17e EZ |
39 | This function is called by `convert-standard-filename'. |
40 | ||
915b0bf0 | 41 | On Windows and DOS, replace invalid characters. On DOS, make |
98d8b17e | 42 | sure to obey the 8.3 limitations." |
09def38b | 43 | (if (or (not (stringp filename)) |
9d47450f EZ |
44 | ;; This catches the case where FILENAME is "x:" or "x:/" or |
45 | ;; "/", thus preventing infinite recursion. | |
46 | (string-match "\\`\\([a-zA-Z]:\\)?[/\\]?\\'" filename)) | |
9c777199 | 47 | filename |
9d47450f EZ |
48 | (let ((flen (length filename))) |
49 | ;; If FILENAME has a trailing slash, remove it and recurse. | |
50 | (if (memq (aref filename (1- flen)) '(?/ ?\\)) | |
5a70d10f | 51 | (concat (dos-convert-standard-filename |
9d47450f EZ |
52 | (substring filename 0 (1- flen))) |
53 | "/") | |
54 | (let* (;; ange-ftp gets in the way for names like "/foo:bar". | |
55 | ;; We need to inhibit all magic file names, because | |
56 | ;; remote file names should never be passed through | |
57 | ;; this function, as they are not meant for the local | |
58 | ;; filesystem! | |
59 | (file-name-handler-alist nil) | |
60 | (dir | |
61 | ;; If FILENAME is "x:foo", file-name-directory returns | |
62 | ;; "x:/bar/baz", substituting the current working | |
63 | ;; directory on drive x:. We want to be left with "x:" | |
64 | ;; instead. | |
65 | (if (and (< 1 flen) | |
66 | (eq (aref filename 1) ?:) | |
67 | (null (string-match "[/\\]" filename))) | |
68 | (substring filename 0 2) | |
69 | (file-name-directory filename))) | |
70 | (dlen-m-1 (1- (length dir))) | |
71 | (string (copy-sequence (file-name-nondirectory filename))) | |
72 | (lastchar (aref string (1- (length string)))) | |
73 | i firstdot) | |
74 | (cond | |
75 | ((msdos-long-file-names) | |
09def38b EZ |
76 | ;; Replace characters that are invalid even on Windows. |
77 | (while (setq i (string-match "[?*:<>|\"\000-\037]" string)) | |
9d47450f EZ |
78 | (aset string i ?!))) |
79 | ((not (member string '("" "." ".."))) | |
80 | ;; Change a leading period to a leading underscore. | |
81 | (if (= (aref string 0) ?.) | |
82 | (aset string 0 ?_)) | |
a007e4e3 EZ |
83 | ;; If the name is longer than 8 chars, and doesn't have a |
84 | ;; period, and we have a dash or underscore that isn't too | |
85 | ;; close to the beginning, change that to a period. This | |
86 | ;; is so we could salvage more characters of the original | |
87 | ;; name by pushing them into the extension. | |
88 | (if (and (not (string-match "\\." string)) | |
89 | (> (length string) 8) | |
90 | ;; We don't gain anything if we put the period closer | |
91 | ;; than 5 chars from the beginning (5 + 3 = 8). | |
92 | (setq i (string-match "[-_]" string 5))) | |
93 | (aset string i ?\.)) | |
9d47450f EZ |
94 | ;; Get rid of invalid characters. |
95 | (while (setq i (string-match | |
96 | "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]" | |
97 | string)) | |
98 | (aset string i ?_)) | |
9d47450f | 99 | ;; If we don't have a period in the first 8 chars, insert one. |
a007e4e3 EZ |
100 | ;; This enables to have 3 more characters from the original |
101 | ;; name in the extension. | |
9d47450f EZ |
102 | (if (> (or (string-match "\\." string) (length string)) |
103 | 8) | |
104 | (setq string | |
105 | (concat (substring string 0 8) | |
106 | "." | |
107 | (substring string 8)))) | |
108 | (setq firstdot (or (string-match "\\." string) | |
109 | (1- (length string)))) | |
110 | ;; Truncate to 3 chars after the first period. | |
111 | (if (> (length string) (+ firstdot 4)) | |
112 | (setq string (substring string 0 (+ firstdot 4)))) | |
113 | ;; Change all periods except the first one into underscores. | |
a007e4e3 | 114 | ;; (DOS doesn't allow more than one period.) |
9d47450f EZ |
115 | (while (string-match "\\." string (1+ firstdot)) |
116 | (setq i (string-match "\\." string (1+ firstdot))) | |
117 | (aset string i ?_)) | |
a007e4e3 EZ |
118 | ;; If the last character of the original filename was `~' or `#', |
119 | ;; make sure the munged name ends with it also. This is so that | |
120 | ;; backup and auto-save files retain their telltale form. | |
121 | (if (memq lastchar '(?~ ?#)) | |
9d47450f EZ |
122 | (aset string (1- (length string)) lastchar)))) |
123 | (concat (if (and (stringp dir) | |
124 | (memq (aref dir dlen-m-1) '(?/ ?\\))) | |
5a70d10f | 125 | (concat (dos-convert-standard-filename |
9d47450f EZ |
126 | (substring dir 0 dlen-m-1)) |
127 | "/") | |
5a70d10f | 128 | (dos-convert-standard-filename dir)) |
9d47450f | 129 | string)))))) |
44998f5b | 130 | |
51f32106 | 131 | (defun dos-8+3-filename (filename) |
a9d36252 EZ |
132 | "Truncate FILENAME to DOS 8+3 limits." |
133 | (if (or (not (stringp filename)) | |
134 | (< (length filename) 5)) ; too short to give any trouble | |
135 | filename | |
136 | (let ((flen (length filename))) | |
137 | ;; If FILENAME has a trailing slash, remove it and recurse. | |
138 | (if (memq (aref filename (1- flen)) '(?/ ?\\)) | |
51f32106 | 139 | (concat (dos-8+3-filename (substring filename 0 (1- flen))) |
a9d36252 EZ |
140 | "/") |
141 | (let* (;; ange-ftp gets in the way for names like "/foo:bar". | |
142 | ;; We need to inhibit all magic file names, because | |
143 | ;; remote file names should never be passed through | |
144 | ;; this function, as they are not meant for the local | |
145 | ;; filesystem! | |
146 | (file-name-handler-alist nil) | |
147 | (dir | |
148 | ;; If FILENAME is "x:foo", file-name-directory returns | |
149 | ;; "x:/bar/baz", substituting the current working | |
150 | ;; directory on drive x:. We want to be left with "x:" | |
151 | ;; instead. | |
152 | (if (and (< 1 flen) | |
153 | (eq (aref filename 1) ?:) | |
154 | (null (string-match "[/\\]" filename))) | |
155 | (substring filename 0 2) | |
156 | (file-name-directory filename))) | |
157 | (dlen-m-1 (1- (length dir))) | |
158 | (string (copy-sequence (file-name-nondirectory filename))) | |
159 | (strlen (length string)) | |
160 | (lastchar (aref string (1- strlen))) | |
161 | i firstdot) | |
162 | (setq firstdot (string-match "\\." string)) | |
163 | (cond | |
164 | (firstdot | |
165 | ;; Truncate the extension to 3 characters. | |
166 | (if (> strlen (+ firstdot 4)) | |
167 | (setq string (substring string 0 (+ firstdot 4)))) | |
168 | ;; Truncate the basename to 8 characters. | |
169 | (if (> firstdot 8) | |
170 | (setq string (concat (substring string 0 8) | |
171 | "." | |
172 | (substring string (1+ firstdot)))))) | |
173 | ((> strlen 8) | |
174 | ;; No dot; truncate file name to 8 characters. | |
175 | (setq string (substring string 0 8)))) | |
176 | ;; If the last character of the original filename was `~', | |
177 | ;; make sure the munged name ends with it also. This is so | |
178 | ;; a backup file retains its final `~'. | |
179 | (if (equal lastchar ?~) | |
180 | (aset string (1- (length string)) lastchar)) | |
181 | (concat (if (and (stringp dir) | |
182 | (memq (aref dir dlen-m-1) '(?/ ?\\))) | |
51f32106 | 183 | (concat (dos-8+3-filename (substring dir 0 dlen-m-1)) |
a9d36252 EZ |
184 | "/") |
185 | ;; Recurse to truncate the leading directories. | |
51f32106 | 186 | (dos-8+3-filename dir)) |
a9d36252 EZ |
187 | string)))))) |
188 | ||
2e480e42 EZ |
189 | ;; This is for the sake of standard file names elsewhere in Emacs that |
190 | ;; are defined as constant strings or via defconst, and whose | |
5a70d10f | 191 | ;; conversion via `dos-convert-standard-filename' does not give good |
2e480e42 EZ |
192 | ;; enough results. |
193 | (defun dosified-file-name (file-name) | |
194 | "Return a variant of FILE-NAME that is valid on MS-DOS filesystems. | |
195 | ||
5a70d10f | 196 | This function is for those rare cases where `dos-convert-standard-filename' |
2e480e42 EZ |
197 | does not do a job that is good enough, e.g. if you need to preserve the |
198 | file-name extension. It recognizes only certain specific file names | |
199 | that are used in Emacs Lisp sources; any other file name will be | |
200 | returned unaltered." | |
201 | (cond | |
202 | ;; See files.el:dir-locals-file. | |
203 | ((string= file-name ".dir-locals.el") | |
204 | "_dir-locals.el") | |
205 | (t | |
206 | file-name))) | |
207 | ||
feb65403 RS |
208 | ;; See dos-vars.el for defcustom. |
209 | (defvar msdos-shells) | |
007c61fa | 210 | |
0c5f6aca | 211 | ;; Override settings chosen at startup. |
5a70d10f | 212 | (defun dos-set-default-process-coding-system () |
224116b8 | 213 | (setq default-process-coding-system |
597e2240 | 214 | (if (default-value 'enable-multibyte-characters) |
224116b8 AI |
215 | '(undecided-dos . undecided-dos) |
216 | '(raw-text-dos . raw-text-dos)))) | |
217 | ||
5a70d10f | 218 | (add-hook 'before-init-hook 'dos-set-default-process-coding-system) |
224116b8 | 219 | |
0c5f6aca EZ |
220 | ;; File names defined in preloaded packages can be incorrect or |
221 | ;; invalid if long file names were available during dumping, but not | |
e6f174da EZ |
222 | ;; at runtime, or vice versa, and if the default file name begins with |
223 | ;; a period. Their defcustom's need to be reevaluated at startup. To | |
224 | ;; see if the list of defcustom's below is up to date, run the command | |
225 | ;; "M-x apropos-value RET ~/\. RET". | |
0c5f6aca | 226 | (defun dos-reevaluate-defcustoms () |
36b434ee EZ |
227 | ;; This is not needed in Emacs 23.2 and later, as trash-directory is |
228 | ;; initialized as nil. But something like this might become | |
229 | ;; necessary in the future, so I'm keeping it here as a reminder. | |
230 | ;(custom-reevaluate-setting 'trash-directory) | |
231 | ) | |
0c5f6aca EZ |
232 | |
233 | (add-hook 'before-init-hook 'dos-reevaluate-defcustoms) | |
234 | ||
5a70d10f | 235 | (defvar dos-register-name-alist |
007c61fa | 236 | '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5) |
21f2acd3 RS |
237 | (cflag . 6) (flags . 7) |
238 | (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0)) | |
239 | (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1)))) | |
007c61fa | 240 | |
98d8b17e EZ |
241 | (define-obsolete-variable-alias |
242 | 'register-name-alist 'dos-register-name-alist "24.1") | |
243 | ||
5a70d10f | 244 | (defun dos-make-register () |
007c61fa RS |
245 | (make-vector 8 0)) |
246 | ||
98d8b17e EZ |
247 | (define-obsolete-function-alias 'make-register 'dos-make-register "24.1") |
248 | ||
5a70d10f SM |
249 | (defun dos-register-value (regs name) |
250 | (let ((where (cdr (assoc name dos-register-name-alist)))) | |
007c61fa RS |
251 | (cond ((consp where) |
252 | (let ((tem (aref regs (car where)))) | |
253 | (if (zerop (cdr where)) | |
254 | (% tem 256) | |
255 | (/ tem 256)))) | |
256 | ((numberp where) | |
257 | (aref regs where)) | |
258 | (t nil)))) | |
259 | ||
98d8b17e EZ |
260 | (define-obsolete-function-alias 'register-value 'dos-register-value "24.1") |
261 | ||
5a70d10f | 262 | (defun dos-set-register-value (regs name value) |
007c61fa | 263 | (and (numberp value) |
21f2acd3 | 264 | (>= value 0) |
5a70d10f | 265 | (let ((where (cdr (assoc name dos-register-name-alist)))) |
007c61fa | 266 | (cond ((consp where) |
21f2acd3 RS |
267 | (let ((tem (aref regs (car where))) |
268 | (value (logand value 255))) | |
269 | (aset regs | |
270 | (car where) | |
271 | (if (zerop (cdr where)) | |
272 | (logior (logand tem 65280) value) | |
273 | (logior (logand tem 255) (lsh value 8)))))) | |
007c61fa | 274 | ((numberp where) |
21f2acd3 | 275 | (aset regs where (logand value 65535)))))) |
007c61fa RS |
276 | regs) |
277 | ||
98d8b17e EZ |
278 | (define-obsolete-function-alias |
279 | 'set-register-value 'dos-set-register-value "24.1") | |
280 | ||
5a70d10f | 281 | (defsubst dos-intdos (regs) |
98d8b17e EZ |
282 | "Issue the DOS Int 21h with registers REGS. |
283 | ||
284 | REGS should be a vector produced by `dos-make-register' | |
285 | and `dos-set-register-value', which see." | |
007c61fa RS |
286 | (int86 33 regs)) |
287 | ||
98d8b17e EZ |
288 | (define-obsolete-function-alias 'intdos 'dos-intdos "24.1") |
289 | ||
70662974 RS |
290 | ;; Backward compatibility for obsolescent functions which |
291 | ;; set screen size. | |
292 | ||
5a70d10f | 293 | (defun dos-mode25 () |
70662974 RS |
294 | "Changes the number of screen rows to 25." |
295 | (interactive) | |
296 | (set-frame-size (selected-frame) 80 25)) | |
297 | ||
98d8b17e EZ |
298 | (define-obsolete-function-alias 'mode25 'dos-mode25 "24.1") |
299 | ||
5a70d10f | 300 | (defun dos-mode4350 () |
70662974 RS |
301 | "Changes the number of rows to 43 or 50. |
302 | Emacs always tries to set the screen height to 50 rows first. | |
303 | If this fails, it will try to set it to 43 rows, on the assumption | |
304 | that your video hardware might not support 50-line mode." | |
305 | (interactive) | |
306 | (set-frame-size (selected-frame) 80 50) | |
307 | (if (eq (frame-height (selected-frame)) 50) | |
308 | nil ; the original built-in function returned nil | |
309 | (set-frame-size (selected-frame) 80 43))) | |
310 | ||
98d8b17e EZ |
311 | (define-obsolete-function-alias 'mode4350 'dos-mode4350 "24.1") |
312 | ||
868c7abd RS |
313 | (provide 'dos-fns) |
314 | ||
cbee283d | 315 | ;; arch-tag: 00b03579-8ebb-4a02-8762-5c5a929774ad |
e8af40ee | 316 | ;;; dos-fns.el ends here |