lisp/dos-fns.el

   1 ;;; dos-fns.el --- MS-Dos specific functions.
   2
   3 ;; Copyright (C) 1991, 1993 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: Morten Welinder (terra@diku.dk)
   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
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Commentary:
  25
  26 ;; Part of this code is taken from (or derived from) demacs.
  27
  28 ;;; Code:
  29
  30 ;;; Add %t: into the mode line format just after the open-paren.
  31 (let ((tail (member "   %[(" mode-line-format)))
  32   (setcdr tail (cons (purecopy "%t:")
  33                      (cdr tail))))
  34
  35 ;; Use ";" instead of ":" as a path separator (from files.el).
  36 (setq path-separator ";")
  37
  38 ;; Set the null device (for compile.el).
  39 (setq grep-null-device "NUL")
  40
  41 ;; Set the grep regexp to match entries with drive letters.
  42 (setq grep-regexp-alist
  43   '(("^\\(\\([a-zA-Z]:\\)?[^:( \t\n]+\\)[:( \t]+\\([0-9]+\\)[:) \t]" 1 3)))
  44
  45 (defvar file-name-buffer-file-type-alist
  46   '(
  47     ("[:/].*config.sys$" . nil)         ; config.sys text
  48     ("\\.elc$" . t)                     ; emacs stuff
  49     ("\\.\\(obj\\|exe\\|com\\|lib\\|sys\\|chk\\|out\\|bin\\|ico\\|pif\\)$" . t)
  50                                         ; MS-Dos stuff
  51     ("\\.\\(arc\\|zip\\|pak\\|lzh\\|zoo\\)$" . t)
  52                                         ; Packers
  53     ("\\.\\(a\\|o\\|tar\\|z\\|gz\\|taz\\)$" . t)
  54                                         ; Unix stuff
  55     ("\\.tp[ulpw]$" . t)
  56                                         ; Borland Pascal stuff
  57     ("[:/]tags$" . t)
  58                                         ; Emacs TAGS file
  59     )
  60   "*Alist for distinguishing text files from binary files.
  61 Each element has the form (REGEXP . TYPE), where REGEXP is matched
  62 against the file name, and TYPE is nil for text, t for binary.")
  63
  64 (defun find-buffer-file-type (filename)
  65   (let ((alist file-name-buffer-file-type-alist)
  66         (found nil)
  67         (code nil))
  68     (let ((case-fold-search t))
  69       (setq filename (file-name-sans-versions filename))
  70       (while (and (not found) alist)
  71         (if (string-match (car (car alist)) filename)
  72             (setq code (cdr (car alist))
  73                   found t))
  74         (setq alist (cdr alist))))
  75     (if found
  76         (cond((memq code '(nil t)) code)
  77              ((and (symbolp code) (fboundp code))
  78               (funcall code filename)))
  79       default-buffer-file-type)))
  80
  81 (defun find-file-binary (filename)
  82   "Visit file FILENAME and treat it as binary."
  83   (interactive "FFind file binary: ")
  84   (let ((file-name-buffer-file-type-alist '(("" . t))))
  85     (find-file filename)))
  86
  87 (defun find-file-text (filename)
  88   "Visit file FILENAME and treat it as a text file."
  89   (interactive "FFind file text: ")
  90   (let ((file-name-buffer-file-type-alist '(("" . nil))))
  91     (find-file filename)))
  92
  93 (defun find-file-not-found-set-buffer-file-type ()
  94   (save-excursion
  95     (set-buffer (current-buffer))
  96     (setq buffer-file-type (find-buffer-file-type (buffer-file-name))))
  97   nil)
  98
  99 ;;; To set the default file type on new files.
 100 (add-hook 'find-file-not-found-hooks 'find-file-not-found-set-buffer-file-type)
 101
 102 (defvar msdos-shells '("command.com" "4dos.com" "ndos.com")
 103   "*List of shells that use `/c' instead of `-c' and a backslashed command.")
 104
 105 (defconst register-name-alist
 106   '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5)
 107     (cflag . 6) (flags . 7)
 108     (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0))
 109     (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1))))
 110
 111 (defun make-register ()
 112   (make-vector 8 0))
 113
 114 (defun register-value (regs name)
 115   (let ((where (cdr (assoc name register-name-alist))))
 116     (cond ((consp where)
 117            (let ((tem (aref regs (car where))))
 118              (if (zerop (cdr where))
 119                  (% tem 256)
 120                (/ tem 256))))
 121           ((numberp where)
 122            (aref regs where))
 123           (t nil))))
 124
 125 (defun set-register-value (regs name value)
 126   (and (numberp value)
 127        (>= value 0)
 128        (let ((where (cdr (assoc name register-name-alist))))
 129          (cond ((consp where)
 130                 (let ((tem (aref regs (car where)))
 131                       (value (logand value 255)))
 132                   (aset regs
 133                         (car where)
 134                         (if (zerop (cdr where))
 135                             (logior (logand tem 65280) value)
 136                           (logior (logand tem 255) (lsh value 8))))))
 137                ((numberp where)
 138                 (aset regs where (logand value 65535))))))
 139   regs)
 140
 141 (defsubst intdos (regs)
 142   (int86 33 regs))
 143
 144 ;; Extra stub to functions in src/frame.c
 145 ;; Emacs aborts during dump if the following don't have a doc string.
 146 (defun window-frame (window)
 147   "Return the frame that WINDOW resides on."
 148   (selected-frame))
 149 (defun raise-frame (frame)
 150   "Raise FRAME to the top of the desktop."
 151   nil)
 152 (defun select-frame (frame &optional no-enter)
 153   "Select FRAME for input events."
 154   (selected-frame))