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007c61fa RS |
1 | ;;; dos-fns.el --- MS-Dos specific functions. |
2 | ||
9596811a | 3 | ;; Copyright (C) 1991, 1993, 1995, 1996 Free Software Foundation, Inc. |
007c61fa | 4 | |
0acdb863 | 5 | ;; Maintainer: Morten Welinder <terra@diku.dk> |
007c61fa RS |
6 | ;; Keywords: internal |
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 | |
b578f267 EN |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
007c61fa RS |
24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;; Part of this code is taken from (or derived from) demacs. | |
28 | ||
29 | ;;; Code: | |
30 | ||
44998f5b RS |
31 | ;; This overrides a trivial definition in files.el. |
32 | (defun convert-standard-filename (filename) | |
33 | "Convert a standard file's name to something suitable for the current OS. | |
34 | This function's standard definition is trivial; it just returns the argument. | |
35 | However, on some systems, the function is redefined | |
36 | with a definition that really does change some file names." | |
09def38b | 37 | (if (or (not (stringp filename)) |
9d47450f EZ |
38 | ;; This catches the case where FILENAME is "x:" or "x:/" or |
39 | ;; "/", thus preventing infinite recursion. | |
40 | (string-match "\\`\\([a-zA-Z]:\\)?[/\\]?\\'" filename)) | |
9c777199 | 41 | filename |
9d47450f EZ |
42 | (let ((flen (length filename))) |
43 | ;; If FILENAME has a trailing slash, remove it and recurse. | |
44 | (if (memq (aref filename (1- flen)) '(?/ ?\\)) | |
45 | (concat (convert-standard-filename | |
46 | (substring filename 0 (1- flen))) | |
47 | "/") | |
48 | (let* (;; ange-ftp gets in the way for names like "/foo:bar". | |
49 | ;; We need to inhibit all magic file names, because | |
50 | ;; remote file names should never be passed through | |
51 | ;; this function, as they are not meant for the local | |
52 | ;; filesystem! | |
53 | (file-name-handler-alist nil) | |
54 | (dir | |
55 | ;; If FILENAME is "x:foo", file-name-directory returns | |
56 | ;; "x:/bar/baz", substituting the current working | |
57 | ;; directory on drive x:. We want to be left with "x:" | |
58 | ;; instead. | |
59 | (if (and (< 1 flen) | |
60 | (eq (aref filename 1) ?:) | |
61 | (null (string-match "[/\\]" filename))) | |
62 | (substring filename 0 2) | |
63 | (file-name-directory filename))) | |
64 | (dlen-m-1 (1- (length dir))) | |
65 | (string (copy-sequence (file-name-nondirectory filename))) | |
66 | (lastchar (aref string (1- (length string)))) | |
67 | i firstdot) | |
68 | (cond | |
69 | ((msdos-long-file-names) | |
09def38b EZ |
70 | ;; Replace characters that are invalid even on Windows. |
71 | (while (setq i (string-match "[?*:<>|\"\000-\037]" string)) | |
9d47450f EZ |
72 | (aset string i ?!))) |
73 | ((not (member string '("" "." ".."))) | |
74 | ;; Change a leading period to a leading underscore. | |
75 | (if (= (aref string 0) ?.) | |
76 | (aset string 0 ?_)) | |
77 | ;; Get rid of invalid characters. | |
78 | (while (setq i (string-match | |
79 | "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]" | |
80 | string)) | |
81 | (aset string i ?_)) | |
82 | ;; If we don't have a period, | |
83 | ;; and we have a dash or underscore that isn't the first char, | |
84 | ;; change that to a period. | |
85 | (if (and (not (string-match "\\." string)) | |
86 | (setq i (string-match "[-_]" string 1))) | |
87 | (aset string i ?\.)) | |
88 | ;; If we don't have a period in the first 8 chars, insert one. | |
89 | (if (> (or (string-match "\\." string) (length string)) | |
90 | 8) | |
91 | (setq string | |
92 | (concat (substring string 0 8) | |
93 | "." | |
94 | (substring string 8)))) | |
95 | (setq firstdot (or (string-match "\\." string) | |
96 | (1- (length string)))) | |
97 | ;; Truncate to 3 chars after the first period. | |
98 | (if (> (length string) (+ firstdot 4)) | |
99 | (setq string (substring string 0 (+ firstdot 4)))) | |
100 | ;; Change all periods except the first one into underscores. | |
101 | (while (string-match "\\." string (1+ firstdot)) | |
102 | (setq i (string-match "\\." string (1+ firstdot))) | |
103 | (aset string i ?_)) | |
104 | ;; If the last character of the original filename was `~', | |
105 | ;; make sure the munged name ends with it also. This is so | |
106 | ;; a backup file retains its final `~'. | |
107 | (if (equal lastchar ?~) | |
108 | (aset string (1- (length string)) lastchar)))) | |
109 | (concat (if (and (stringp dir) | |
110 | (memq (aref dir dlen-m-1) '(?/ ?\\))) | |
111 | (concat (convert-standard-filename | |
112 | (substring dir 0 dlen-m-1)) | |
113 | "/") | |
114 | (convert-standard-filename dir)) | |
115 | string)))))) | |
44998f5b | 116 | |
51f32106 | 117 | (defun dos-8+3-filename (filename) |
a9d36252 EZ |
118 | "Truncate FILENAME to DOS 8+3 limits." |
119 | (if (or (not (stringp filename)) | |
120 | (< (length filename) 5)) ; too short to give any trouble | |
121 | filename | |
122 | (let ((flen (length filename))) | |
123 | ;; If FILENAME has a trailing slash, remove it and recurse. | |
124 | (if (memq (aref filename (1- flen)) '(?/ ?\\)) | |
51f32106 | 125 | (concat (dos-8+3-filename (substring filename 0 (1- flen))) |
a9d36252 EZ |
126 | "/") |
127 | (let* (;; ange-ftp gets in the way for names like "/foo:bar". | |
128 | ;; We need to inhibit all magic file names, because | |
129 | ;; remote file names should never be passed through | |
130 | ;; this function, as they are not meant for the local | |
131 | ;; filesystem! | |
132 | (file-name-handler-alist nil) | |
133 | (dir | |
134 | ;; If FILENAME is "x:foo", file-name-directory returns | |
135 | ;; "x:/bar/baz", substituting the current working | |
136 | ;; directory on drive x:. We want to be left with "x:" | |
137 | ;; instead. | |
138 | (if (and (< 1 flen) | |
139 | (eq (aref filename 1) ?:) | |
140 | (null (string-match "[/\\]" filename))) | |
141 | (substring filename 0 2) | |
142 | (file-name-directory filename))) | |
143 | (dlen-m-1 (1- (length dir))) | |
144 | (string (copy-sequence (file-name-nondirectory filename))) | |
145 | (strlen (length string)) | |
146 | (lastchar (aref string (1- strlen))) | |
147 | i firstdot) | |
148 | (setq firstdot (string-match "\\." string)) | |
149 | (cond | |
150 | (firstdot | |
151 | ;; Truncate the extension to 3 characters. | |
152 | (if (> strlen (+ firstdot 4)) | |
153 | (setq string (substring string 0 (+ firstdot 4)))) | |
154 | ;; Truncate the basename to 8 characters. | |
155 | (if (> firstdot 8) | |
156 | (setq string (concat (substring string 0 8) | |
157 | "." | |
158 | (substring string (1+ firstdot)))))) | |
159 | ((> strlen 8) | |
160 | ;; No dot; truncate file name to 8 characters. | |
161 | (setq string (substring string 0 8)))) | |
162 | ;; If the last character of the original filename was `~', | |
163 | ;; make sure the munged name ends with it also. This is so | |
164 | ;; a backup file retains its final `~'. | |
165 | (if (equal lastchar ?~) | |
166 | (aset string (1- (length string)) lastchar)) | |
167 | (concat (if (and (stringp dir) | |
168 | (memq (aref dir dlen-m-1) '(?/ ?\\))) | |
51f32106 | 169 | (concat (dos-8+3-filename (substring dir 0 dlen-m-1)) |
a9d36252 EZ |
170 | "/") |
171 | ;; Recurse to truncate the leading directories. | |
51f32106 | 172 | (dos-8+3-filename dir)) |
a9d36252 EZ |
173 | string)))))) |
174 | ||
feb65403 RS |
175 | ;; See dos-vars.el for defcustom. |
176 | (defvar msdos-shells) | |
007c61fa | 177 | |
224116b8 AI |
178 | ;;; Override setting chosen at startup. |
179 | (defun set-default-process-coding-system () | |
180 | (setq default-process-coding-system | |
181 | (if default-enable-multibyte-characters | |
182 | '(undecided-dos . undecided-dos) | |
183 | '(raw-text-dos . raw-text-dos)))) | |
184 | ||
185 | (add-hook 'before-init-hook 'set-default-process-coding-system) | |
186 | ||
cafef6ab | 187 | (defvar register-name-alist |
007c61fa | 188 | '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5) |
21f2acd3 RS |
189 | (cflag . 6) (flags . 7) |
190 | (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0)) | |
191 | (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1)))) | |
007c61fa RS |
192 | |
193 | (defun make-register () | |
194 | (make-vector 8 0)) | |
195 | ||
196 | (defun register-value (regs name) | |
21f2acd3 | 197 | (let ((where (cdr (assoc name register-name-alist)))) |
007c61fa RS |
198 | (cond ((consp where) |
199 | (let ((tem (aref regs (car where)))) | |
200 | (if (zerop (cdr where)) | |
201 | (% tem 256) | |
202 | (/ tem 256)))) | |
203 | ((numberp where) | |
204 | (aref regs where)) | |
205 | (t nil)))) | |
206 | ||
207 | (defun set-register-value (regs name value) | |
208 | (and (numberp value) | |
21f2acd3 RS |
209 | (>= value 0) |
210 | (let ((where (cdr (assoc name register-name-alist)))) | |
007c61fa | 211 | (cond ((consp where) |
21f2acd3 RS |
212 | (let ((tem (aref regs (car where))) |
213 | (value (logand value 255))) | |
214 | (aset regs | |
215 | (car where) | |
216 | (if (zerop (cdr where)) | |
217 | (logior (logand tem 65280) value) | |
218 | (logior (logand tem 255) (lsh value 8)))))) | |
007c61fa | 219 | ((numberp where) |
21f2acd3 | 220 | (aset regs where (logand value 65535)))))) |
007c61fa RS |
221 | regs) |
222 | ||
223 | (defsubst intdos (regs) | |
224 | (int86 33 regs)) | |
225 | ||
70662974 RS |
226 | ;; Backward compatibility for obsolescent functions which |
227 | ;; set screen size. | |
228 | ||
229 | (defun mode25 () | |
230 | "Changes the number of screen rows to 25." | |
231 | (interactive) | |
232 | (set-frame-size (selected-frame) 80 25)) | |
233 | ||
234 | (defun mode4350 () | |
235 | "Changes the number of rows to 43 or 50. | |
236 | Emacs always tries to set the screen height to 50 rows first. | |
237 | If this fails, it will try to set it to 43 rows, on the assumption | |
238 | that your video hardware might not support 50-line mode." | |
239 | (interactive) | |
240 | (set-frame-size (selected-frame) 80 50) | |
241 | (if (eq (frame-height (selected-frame)) 50) | |
242 | nil ; the original built-in function returned nil | |
243 | (set-frame-size (selected-frame) 80 43))) | |
244 | ||
868c7abd RS |
245 | (provide 'dos-fns) |
246 | ||
247 | ; dos-fns.el ends here |