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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." | |
9c777199 RS |
37 | (if (or (msdos-long-file-names) |
38 | (not (stringp filename)) | |
39 | (member (file-name-nondirectory filename) '("" "." ".."))) | |
40 | filename | |
41 | (let* ((dir (file-name-directory filename)) | |
42 | (string (copy-sequence (file-name-nondirectory filename))) | |
43 | (lastchar (aref string (1- (length string)))) | |
44 | i firstdot) | |
9c777199 RS |
45 | ;; Change a leading period to a leading underscore. |
46 | (if (= (aref string 0) ?.) | |
47 | (aset string 0 ?_)) | |
48 | ;; Get rid of invalid characters. | |
49 | (while (setq i (string-match | |
50 | "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]" | |
51 | string)) | |
52 | (aset string i ?_)) | |
53 | ;; If we don't have a period, | |
54 | ;; and we have a dash or underscore that isn't the first char, | |
55 | ;; change that to a period. | |
56 | (if (and (not (string-match "\\." string)) | |
57 | (setq i (string-match "[-_]" string 1))) | |
58 | (aset string i ?\.)) | |
59 | ;; If we don't have a period in the first 8 chars, insert one. | |
60 | (if (> (or (string-match "\\." string) | |
61 | (length string)) | |
62 | 8) | |
63 | (setq string | |
64 | (concat (substring string 0 8) | |
65 | "." | |
66 | (substring string 8)))) | |
67 | (setq firstdot (or (string-match "\\." string) (1- (length string)))) | |
68 | ;; Truncate to 3 chars after the first period. | |
69 | (if (> (length string) (+ firstdot 4)) | |
70 | (setq string (substring string 0 (+ firstdot 4)))) | |
71 | ;; Change all periods except the first one into underscores. | |
72 | (while (string-match "\\." string (1+ firstdot)) | |
73 | (setq i (string-match "\\." string (1+ firstdot))) | |
74 | (aset string i ?_)) | |
75 | ;; If the last character of the original filename was `~', | |
76 | ;; make sure the munged name ends with it also. | |
77 | (if (equal lastchar ?~) | |
78 | (aset string (1- (length string)) lastchar)) | |
79 | (concat dir string)))) | |
44998f5b | 80 | |
feb65403 RS |
81 | ;; See dos-vars.el for defcustom. |
82 | (defvar msdos-shells) | |
007c61fa | 83 | |
cafef6ab | 84 | (defvar register-name-alist |
007c61fa | 85 | '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5) |
21f2acd3 RS |
86 | (cflag . 6) (flags . 7) |
87 | (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0)) | |
88 | (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1)))) | |
007c61fa RS |
89 | |
90 | (defun make-register () | |
91 | (make-vector 8 0)) | |
92 | ||
93 | (defun register-value (regs name) | |
21f2acd3 | 94 | (let ((where (cdr (assoc name register-name-alist)))) |
007c61fa RS |
95 | (cond ((consp where) |
96 | (let ((tem (aref regs (car where)))) | |
97 | (if (zerop (cdr where)) | |
98 | (% tem 256) | |
99 | (/ tem 256)))) | |
100 | ((numberp where) | |
101 | (aref regs where)) | |
102 | (t nil)))) | |
103 | ||
104 | (defun set-register-value (regs name value) | |
105 | (and (numberp value) | |
21f2acd3 RS |
106 | (>= value 0) |
107 | (let ((where (cdr (assoc name register-name-alist)))) | |
007c61fa | 108 | (cond ((consp where) |
21f2acd3 RS |
109 | (let ((tem (aref regs (car where))) |
110 | (value (logand value 255))) | |
111 | (aset regs | |
112 | (car where) | |
113 | (if (zerop (cdr where)) | |
114 | (logior (logand tem 65280) value) | |
115 | (logior (logand tem 255) (lsh value 8)))))) | |
007c61fa | 116 | ((numberp where) |
21f2acd3 | 117 | (aset regs where (logand value 65535)))))) |
007c61fa RS |
118 | regs) |
119 | ||
120 | (defsubst intdos (regs) | |
121 | (int86 33 regs)) | |
122 | ||
70662974 RS |
123 | ;; Backward compatibility for obsolescent functions which |
124 | ;; set screen size. | |
125 | ||
126 | (defun mode25 () | |
127 | "Changes the number of screen rows to 25." | |
128 | (interactive) | |
129 | (set-frame-size (selected-frame) 80 25)) | |
130 | ||
131 | (defun mode4350 () | |
132 | "Changes the number of rows to 43 or 50. | |
133 | Emacs always tries to set the screen height to 50 rows first. | |
134 | If this fails, it will try to set it to 43 rows, on the assumption | |
135 | that your video hardware might not support 50-line mode." | |
136 | (interactive) | |
137 | (set-frame-size (selected-frame) 80 50) | |
138 | (if (eq (frame-height (selected-frame)) 50) | |
139 | nil ; the original built-in function returned nil | |
140 | (set-frame-size (selected-frame) 80 43))) | |
141 | ||
868c7abd RS |
142 | (provide 'dos-fns) |
143 | ||
144 | ; dos-fns.el ends here |