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[emacs.git] / lisp / dos-fns.el
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1 ;;; dos-fns.el --- MS-Dos specific functions.
3 ;; Copyright (C) 1991, 1993, 1995, 1996 Free Software Foundation, Inc.
5 ;; Maintainer: Morten Welinder <terra@diku.dk>
6 ;; Keywords: internal
8 ;; This file is part of GNU Emacs.
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.
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.
20 ;; You should have received a copy of the GNU General Public License
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.
25 ;;; Commentary:
27 ;; Part of this code is taken from (or derived from) demacs.
29 ;;; Code:
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."
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)
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))
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))))
81 (defvar msdos-shells '("command.com" "4dos.com" "ndos.com")
82 "*List of shells that use `/c' instead of `-c' and a backslashed command.")
84 (defvar register-name-alist
85 '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5)
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))))
90 (defun make-register ()
91 (make-vector 8 0))
93 (defun register-value (regs name)
94 (let ((where (cdr (assoc name register-name-alist))))
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))))
104 (defun set-register-value (regs name value)
105 (and (numberp value)
106 (>= value 0)
107 (let ((where (cdr (assoc name register-name-alist))))
108 (cond ((consp where)
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))))))
116 ((numberp where)
117 (aset regs where (logand value 65535))))))
118 regs)
120 (defsubst intdos (regs)
121 (int86 33 regs))
123 ;; Support for printing under MS-DOS, see lpr.el and ps-print.el.
124 (defvar dos-printer "PRN"
125 "*The name of a local MS-DOS device to which data is sent for printing.
126 \(Note that PostScript files are sent to `dos-ps-printer', which see.\)
128 Typical non-default settings would be \"LPT1\" to \"LPT3\" for
129 parallel printers, or \"COM1\" to \"COM4\" or \"AUX\" for serial
130 printers. You can also set it to a name of a file, in which
131 case the output gets appended to that file.
132 If you want to discard the printed output, set this to \"NUL\".")
134 (defun dos-print-region-function (start end
135 &optional lpr-prog
136 delete-text buf display rest)
137 "MS-DOS-specific function to print the region on a printer.
138 Writes the region to the device or file which is a value of
139 `dos-printer' \(which see\). Ignores any arguments beyond
140 START and END."
142 (write-region start end dos-printer t 0)
143 ;; Make each print-out start on a new page, but don't waste
144 ;; paper if there was a form-feed at the end of this file.
145 (if (not (char-equal (char-after (1- end)) ?\C-l))
146 (write-region "\f" nil dos-printer t 0)))
148 ;; Set this to nil if you have a port of the `lpr' program and
149 ;; you want to use it for printing. If the default setting is
150 ;; in effect, `lpr-command' and its switches are ignored when
151 ;; printing with `lpr-xxx' and `print-xxx'.
152 (setq print-region-function 'dos-print-region-function)
154 ;; Set this to nil if you have a port of the `pr' program
155 ;; (e.g., from GNU Textutils), or if you have an `lpr'
156 ;; program (see above) that can print page headers.
157 ;; If `lpr-headers-switches' is non-nil (the default) and
158 ;; `print-region-function' is set to `dos-print-region-function',
159 ;; then requests to print page headers will be silently
160 ;; ignored, and `print-buffer' and `print-region' produce
161 ;; the same output as `lpr-buffer' and `lpr-region', accordingly.
162 (setq lpr-headers-switches "(page headers are not supported)")
164 (defvar dos-ps-printer "PRN"
165 "*Method for printing PostScript files under MS-DOS.
167 If the value is a string, then it is taken as the name of the
168 device to which PostScript files are written. By default it
169 is the default printer device; typical non-default settings
170 would be \"LPT1\" to \"LPT3\" for parallel printers, or \"COM1\"
171 to \"COM4\" or \"AUX\" for serial printers. You can also set it
172 to a name of a file, in which case the output gets appended
173 to that file. \(Note that `ps-print' package already has
174 facilities for printing to a file, so you might as well use
175 them instead of changing the setting of this variable.\) If
176 you want to silently discard the printed output, set this to \"NUL\".
178 If the value is anything but a string, PostScript files will be
179 piped to the program given by `ps-lpr-command', with switches
180 given by `ps-lpr-switches', which see.")
182 (setq ps-lpr-command "gs")
184 (setq ps-lpr-switches '("-q" "-dNOPAUSE" "-sDEVICE=epson" "-r240x60"
185 "-sOutputFile=LPT1" "-"))
187 ;; Backward compatibility for obsolescent functions which
188 ;; set screen size.
190 (defun mode25 ()
191 "Changes the number of screen rows to 25."
192 (interactive)
193 (set-frame-size (selected-frame) 80 25))
195 (defun mode4350 ()
196 "Changes the number of rows to 43 or 50.
197 Emacs always tries to set the screen height to 50 rows first.
198 If this fails, it will try to set it to 43 rows, on the assumption
199 that your video hardware might not support 50-line mode."
200 (interactive)
201 (set-frame-size (selected-frame) 80 50)
202 (if (eq (frame-height (selected-frame)) 50)
203 nil ; the original built-in function returned nil
204 (set-frame-size (selected-frame) 80 43)))
206 (provide 'dos-fns)
208 ; dos-fns.el ends here