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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 | |
feb65403 RS |
117 | ;; See dos-vars.el for defcustom. |
118 | (defvar msdos-shells) | |
007c61fa | 119 | |
224116b8 AI |
120 | ;;; Override setting chosen at startup. |
121 | (defun set-default-process-coding-system () | |
122 | (setq default-process-coding-system | |
123 | (if default-enable-multibyte-characters | |
124 | '(undecided-dos . undecided-dos) | |
125 | '(raw-text-dos . raw-text-dos)))) | |
126 | ||
127 | (add-hook 'before-init-hook 'set-default-process-coding-system) | |
128 | ||
cafef6ab | 129 | (defvar register-name-alist |
007c61fa | 130 | '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5) |
21f2acd3 RS |
131 | (cflag . 6) (flags . 7) |
132 | (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0)) | |
133 | (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1)))) | |
007c61fa RS |
134 | |
135 | (defun make-register () | |
136 | (make-vector 8 0)) | |
137 | ||
138 | (defun register-value (regs name) | |
21f2acd3 | 139 | (let ((where (cdr (assoc name register-name-alist)))) |
007c61fa RS |
140 | (cond ((consp where) |
141 | (let ((tem (aref regs (car where)))) | |
142 | (if (zerop (cdr where)) | |
143 | (% tem 256) | |
144 | (/ tem 256)))) | |
145 | ((numberp where) | |
146 | (aref regs where)) | |
147 | (t nil)))) | |
148 | ||
149 | (defun set-register-value (regs name value) | |
150 | (and (numberp value) | |
21f2acd3 RS |
151 | (>= value 0) |
152 | (let ((where (cdr (assoc name register-name-alist)))) | |
007c61fa | 153 | (cond ((consp where) |
21f2acd3 RS |
154 | (let ((tem (aref regs (car where))) |
155 | (value (logand value 255))) | |
156 | (aset regs | |
157 | (car where) | |
158 | (if (zerop (cdr where)) | |
159 | (logior (logand tem 65280) value) | |
160 | (logior (logand tem 255) (lsh value 8)))))) | |
007c61fa | 161 | ((numberp where) |
21f2acd3 | 162 | (aset regs where (logand value 65535)))))) |
007c61fa RS |
163 | regs) |
164 | ||
165 | (defsubst intdos (regs) | |
166 | (int86 33 regs)) | |
167 | ||
70662974 RS |
168 | ;; Backward compatibility for obsolescent functions which |
169 | ;; set screen size. | |
170 | ||
171 | (defun mode25 () | |
172 | "Changes the number of screen rows to 25." | |
173 | (interactive) | |
174 | (set-frame-size (selected-frame) 80 25)) | |
175 | ||
176 | (defun mode4350 () | |
177 | "Changes the number of rows to 43 or 50. | |
178 | Emacs always tries to set the screen height to 50 rows first. | |
179 | If this fails, it will try to set it to 43 rows, on the assumption | |
180 | that your video hardware might not support 50-line mode." | |
181 | (interactive) | |
182 | (set-frame-size (selected-frame) 80 50) | |
183 | (if (eq (frame-height (selected-frame)) 50) | |
184 | nil ; the original built-in function returned nil | |
185 | (set-frame-size (selected-frame) 80 43))) | |
186 | ||
868c7abd RS |
187 | (provide 'dos-fns) |
188 | ||
189 | ; dos-fns.el ends here |