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- ;;; dos-fns.el --- MS-Dos specific functions.
-
- ;; Copyright (C) 1991, 1993, 1995, 1996 Free Software Foundation, Inc.
-
- ;; Maintainer: Morten Welinder (terra@diku.dk)
- ;; Keywords: internal
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; Part of this code is taken from (or derived from) demacs.
-
- ;;; Code:
-
- ;;; Add %t: into the mode line format just after the open-paren.
- (let ((tail (member " %[(" mode-line-format)))
- (setcdr tail (cons (purecopy "%t:")
- (cdr tail))))
-
- ;; Use ";" instead of ":" as a path separator (from files.el).
- (setq path-separator ";")
-
- ;; Set the null device (for compile.el).
- (setq grep-null-device "NUL")
-
- ;; Set the grep regexp to match entries with drive letters.
- (setq grep-regexp-alist
- '(("^\\(\\([a-zA-Z]:\\)?[^:( \t\n]+\\)[:( \t]+\\([0-9]+\\)[:) \t]" 1 3)))
-
- ;; This overrides a trivial definition in files.el.
- (defun convert-standard-filename (filename)
- "Convert a standard file's name to something suitable for the current OS.
- This function's standard definition is trivial; it just returns the argument.
- However, on some systems, the function is redefined
- with a definition that really does change some file names."
- (if (or (msdos-long-file-names)
- (not (stringp filename))
- (member (file-name-nondirectory filename) '("" "." "..")))
- filename
- (let* ((dir (file-name-directory filename))
- (string (copy-sequence (file-name-nondirectory filename)))
- (lastchar (aref string (1- (length string))))
- i firstdot)
- ;; Change a leading period to a leading underscore.
- (if (= (aref string 0) ?.)
- (aset string 0 ?_))
- ;; Get rid of invalid characters.
- (while (setq i (string-match
- "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]"
- string))
- (aset string i ?_))
- ;; If we don't have a period,
- ;; and we have a dash or underscore that isn't the first char,
- ;; change that to a period.
- (if (and (not (string-match "\\." string))
- (setq i (string-match "[-_]" string 1)))
- (aset string i ?\.))
- ;; If we don't have a period in the first 8 chars, insert one.
- (if (> (or (string-match "\\." string)
- (length string))
- 8)
- (setq string
- (concat (substring string 0 8)
- "."
- (substring string 8))))
- (setq firstdot (or (string-match "\\." string) (1- (length string))))
- ;; Truncate to 3 chars after the first period.
- (if (> (length string) (+ firstdot 4))
- (setq string (substring string 0 (+ firstdot 4))))
- ;; Change all periods except the first one into underscores.
- (while (string-match "\\." string (1+ firstdot))
- (setq i (string-match "\\." string (1+ firstdot)))
- (aset string i ?_))
- ;; If the last character of the original filename was `~',
- ;; make sure the munged name ends with it also.
- (if (equal lastchar ?~)
- (aset string (1- (length string)) lastchar))
- (concat dir string))))
-
- (defvar file-name-buffer-file-type-alist
- '(
- ("[:/].*config.sys$" . nil) ; config.sys text
- ("\\.elc$" . t) ; emacs stuff
- ("\\.\\(obj\\|exe\\|com\\|lib\\|sys\\|chk\\|out\\|bin\\|ico\\|pif\\)$" . t)
- ; MS-Dos stuff
- ("\\.\\(arc\\|zip\\|pak\\|lzh\\|zoo\\)$" . t)
- ; Packers
- ("\\.\\(a\\|o\\|tar\\|z\\|gz\\|taz\\)$" . t)
- ; Unix stuff
- ("\\.tp[ulpw]$" . t)
- ; Borland Pascal stuff
- ("[:/]tags$" . t)
- ; Emacs TAGS file
- )
- "*Alist for distinguishing text files from binary files.
- Each element has the form (REGEXP . TYPE), where REGEXP is matched
- against the file name, and TYPE is nil for text, t for binary.")
-
- (defun find-buffer-file-type (filename)
- (let ((alist file-name-buffer-file-type-alist)
- (found nil)
- (code nil))
- (let ((case-fold-search t))
- (setq filename (file-name-sans-versions filename))
- (while (and (not found) alist)
- (if (string-match (car (car alist)) filename)
- (setq code (cdr (car alist))
- found t))
- (setq alist (cdr alist))))
- (if found
- (cond((memq code '(nil t)) code)
- ((and (symbolp code) (fboundp code))
- (funcall code filename)))
- default-buffer-file-type)))
-
- (defun find-file-binary (filename)
- "Visit file FILENAME and treat it as binary."
- (interactive "FFind file binary: ")
- (let ((file-name-buffer-file-type-alist '(("" . t))))
- (find-file filename)))
-
- (defun find-file-text (filename)
- "Visit file FILENAME and treat it as a text file."
- (interactive "FFind file text: ")
- (let ((file-name-buffer-file-type-alist '(("" . nil))))
- (find-file filename)))
-
- (defun find-file-not-found-set-buffer-file-type ()
- (save-excursion
- (set-buffer (current-buffer))
- (setq buffer-file-type (find-buffer-file-type (buffer-file-name))))
- nil)
-
- ;;; To set the default file type on new files.
- (add-hook 'find-file-not-found-hooks 'find-file-not-found-set-buffer-file-type)
-
- (defvar msdos-shells '("command.com" "4dos.com" "ndos.com")
- "*List of shells that use `/c' instead of `-c' and a backslashed command.")
-
- (defconst register-name-alist
- '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5)
- (cflag . 6) (flags . 7)
- (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0))
- (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1))))
-
- (defun make-register ()
- (make-vector 8 0))
-
- (defun register-value (regs name)
- (let ((where (cdr (assoc name register-name-alist))))
- (cond ((consp where)
- (let ((tem (aref regs (car where))))
- (if (zerop (cdr where))
- (% tem 256)
- (/ tem 256))))
- ((numberp where)
- (aref regs where))
- (t nil))))
-
- (defun set-register-value (regs name value)
- (and (numberp value)
- (>= value 0)
- (let ((where (cdr (assoc name register-name-alist))))
- (cond ((consp where)
- (let ((tem (aref regs (car where)))
- (value (logand value 255)))
- (aset regs
- (car where)
- (if (zerop (cdr where))
- (logior (logand tem 65280) value)
- (logior (logand tem 255) (lsh value 8))))))
- ((numberp where)
- (aset regs where (logand value 65535))))))
- regs)
-
- (defsubst intdos (regs)
- (int86 33 regs))
-
- ;; Support for printing under MS-DOS, see lpr.el and ps-print.el.
- (defvar dos-printer "PRN"
- "*The name of a local MS-DOS device to which data is sent for printing.
- \(Note that PostScript files are sent to `dos-ps-printer', which see.\)
-
- Typical non-default settings would be \"LPT1\" to \"LPT3\" for
- parallel printers, or \"COM1\" to \"COM4\" or \"AUX\" for serial
- printers. You can also set it to a name of a file, in which
- case the output gets appended to that file.
- If you want to discard the printed output, set this to \"NUL\".")
-
- (defun dos-print-region-function (start end
- &optional lpr-prog
- delete-text buf display rest)
- "MS-DOS-specific function to print the region on a printer.
- Writes the region to the device or file which is a value of
- `dos-printer' \(which see\). Ignores any arguments beyond
- START and END."
-
- (write-region start end dos-printer t 0)
- ;; Make each print-out start on a new page, but don't waste
- ;; paper if there was a form-feed at the end of this file.
- (if (not (char-equal (char-after (1- end)) ?\C-l))
- (write-region "\f" nil dos-printer t 0)))
-
- ;; Set this to nil if you have a port of the `lpr' program and
- ;; you want to use it for printing. If the default setting is
- ;; in effect, `lpr-command' and its switches are ignored when
- ;; printing with `lpr-xxx' and `print-xxx'.
- (setq print-region-function 'dos-print-region-function)
-
- ;; Set this to nil if you have a port of the `pr' program
- ;; (e.g., from GNU Textutils), or if you have an `lpr'
- ;; program (see above) that can print page headers.
- ;; If `lpr-headers-switches' is non-nil (the default) and
- ;; `print-region-function' is set to `dos-print-region-function',
- ;; then requests to print page headers will be silently
- ;; ignored, and `print-buffer' and `print-region' produce
- ;; the same output as `lpr-buffer' and `lpr-region', accordingly.
- (setq lpr-headers-switches "(page headers are not supported)")
-
- (defvar dos-ps-printer "PRN"
- "*Method for printing PostScript files under MS-DOS.
-
- If the value is a string, then it is taken as the name of the
- device to which PostScript files are written. By default it
- is the default printer device; typical non-default settings
- would be \"LPT1\" to \"LPT3\" for parallel printers, or \"COM1\"
- to \"COM4\" or \"AUX\" for serial printers. You can also set it
- to a name of a file, in which case the output gets appended
- to that file. \(Note that `ps-print' package already has
- facilities for printing to a file, so you might as well use
- them instead of changing the setting of this variable.\) If
- you want to silently discard the printed output, set this to \"NUL\".
-
- If the value is anything but a string, PostScript files will be
- piped to the program given by `ps-lpr-command', with switches
- given by `ps-lpr-switches', which see.")
-
- (setq ps-lpr-command "gs")
-
- (setq ps-lpr-switches '("-q" "-dNOPAUSE" "-sDEVICE=epson" "-r240x60"
- "-sOutputFile=LPT1" "-"))
-
- ;; Backward compatibility for obsolescent functions which
- ;; set screen size.
-
- (defun mode25 ()
- "Changes the number of screen rows to 25."
- (interactive)
- (set-frame-size (selected-frame) 80 25))
-
- (defun mode4350 ()
- "Changes the number of rows to 43 or 50.
- Emacs always tries to set the screen height to 50 rows first.
- If this fails, it will try to set it to 43 rows, on the assumption
- that your video hardware might not support 50-line mode."
- (interactive)
- (set-frame-size (selected-frame) 80 50)
- (if (eq (frame-height (selected-frame)) 50)
- nil ; the original built-in function returned nil
- (set-frame-size (selected-frame) 80 43)))
-
- (provide 'dos-fns)
-
- ; dos-fns.el ends here
-