lisp/dos-fns.el

   1 ;;; dos-fns.el --- MS-Dos specific functions.
   2
   3 ;; Copyright (C) 1991, 1993, 1995, 1996 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 the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; Part of this code is taken from (or derived from) demacs.
  28
  29 ;;; Code:
  30
  31 ;;; Add %t: into the mode line format just after the open-paren.
  32 (let ((tail (member "   %[(" mode-line-format)))
  33   (setcdr tail (cons (purecopy "%t:")
  34                      (cdr tail))))
  35
  36 ;; Use ";" instead of ":" as a path separator (from files.el).
  37 (setq path-separator ";")
  38
  39 ;; Set the null device (for compile.el).
  40 (setq grep-null-device "NUL")
  41
  42 ;; Set the grep regexp to match entries with drive letters.
  43 (setq grep-regexp-alist
  44   '(("^\\(\\([a-zA-Z]:\\)?[^:( \t\n]+\\)[:( \t]+\\([0-9]+\\)[:) \t]" 1 3)))
  45
  46 ;; This overrides a trivial definition in files.el.
  47 (defun convert-standard-filename (filename)
  48   "Convert a standard file's name to something suitable for the current OS.
  49 This function's standard definition is trivial; it just returns the argument.
  50 However, on some systems, the function is redefined
  51 with a definition that really does change some file names."
  52   (if (or (msdos-long-file-names)
  53           (not (stringp filename))
  54           (member (file-name-nondirectory filename) '("" "." "..")))
  55       filename
  56     (let* ((dir (file-name-directory filename))
  57            (string (copy-sequence (file-name-nondirectory filename)))
  58            (lastchar (aref string (1- (length string))))
  59            i firstdot)
  60       ;; Change a leading period to a leading underscore.
  61       (if (= (aref string 0) ?.)
  62           (aset string 0 ?_))
  63       ;; Get rid of invalid characters.
  64       (while (setq i (string-match
  65                       "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]"
  66                       string))
  67         (aset string i ?_))
  68       ;; If we don't have a period,
  69       ;; and we have a dash or underscore that isn't the first char,
  70       ;; change that to a period.
  71       (if (and (not (string-match "\\." string))
  72                (setq i (string-match "[-_]" string 1)))
  73           (aset string i ?\.))
  74       ;; If we don't have a period in the first 8 chars, insert one.
  75       (if (> (or (string-match "\\." string)
  76                  (length string))
  77              8)
  78           (setq string
  79                 (concat (substring string 0 8)
  80                         "."
  81                         (substring string 8))))
  82       (setq firstdot (or (string-match "\\." string) (1- (length string))))
  83       ;; Truncate to 3 chars after the first period.
  84       (if (> (length string) (+ firstdot 4))
  85           (setq string (substring string 0 (+ firstdot 4))))
  86       ;; Change all periods except the first one into underscores.
  87       (while (string-match "\\." string (1+ firstdot))
  88         (setq i (string-match "\\." string (1+ firstdot)))
  89         (aset string i ?_))
  90       ;; If the last character of the original filename was `~',
  91       ;; make sure the munged name ends with it also.
  92       (if (equal lastchar ?~)
  93           (aset string (1- (length string)) lastchar))
  94       (concat dir string))))
  95
  96 (defvar file-name-buffer-file-type-alist
  97   '(
  98     ("[:/].*config.sys$" . nil)         ; config.sys text
  99     ("\\.elc$" . t)                     ; emacs stuff
 100     ("\\.\\(obj\\|exe\\|com\\|lib\\|sys\\|chk\\|out\\|bin\\|ico\\|pif\\)$" . t)
 101                                         ; MS-Dos stuff
 102     ("\\.\\(arc\\|zip\\|pak\\|lzh\\|zoo\\)$" . t)
 103                                         ; Packers
 104     ("\\.\\(a\\|o\\|tar\\|z\\|gz\\|taz\\)$" . t)
 105                                         ; Unix stuff
 106     ("\\.tp[ulpw]$" . t)
 107                                         ; Borland Pascal stuff
 108     ("[:/]tags$" . t)
 109                                         ; Emacs TAGS file
 110     )
 111   "*Alist for distinguishing text files from binary files.
 112 Each element has the form (REGEXP . TYPE), where REGEXP is matched
 113 against the file name, and TYPE is nil for text, t for binary.")
 114
 115 (defun find-buffer-file-type (filename)
 116   (let ((alist file-name-buffer-file-type-alist)
 117         (found nil)
 118         (code nil))
 119     (let ((case-fold-search t))
 120       (setq filename (file-name-sans-versions filename))
 121       (while (and (not found) alist)
 122         (if (string-match (car (car alist)) filename)
 123             (setq code (cdr (car alist))
 124                   found t))
 125         (setq alist (cdr alist))))
 126     (if found
 127         (cond((memq code '(nil t)) code)
 128              ((and (symbolp code) (fboundp code))
 129               (funcall code filename)))
 130       default-buffer-file-type)))
 131
 132 (defun find-file-binary (filename)
 133   "Visit file FILENAME and treat it as binary."
 134   (interactive "FFind file binary: ")
 135   (let ((file-name-buffer-file-type-alist '(("" . t))))
 136     (find-file filename)))
 137
 138 (defun find-file-text (filename)
 139   "Visit file FILENAME and treat it as a text file."
 140   (interactive "FFind file text: ")
 141   (let ((file-name-buffer-file-type-alist '(("" . nil))))
 142     (find-file filename)))
 143
 144 (defun find-file-not-found-set-buffer-file-type ()
 145   (save-excursion
 146     (set-buffer (current-buffer))
 147     (setq buffer-file-type (find-buffer-file-type (buffer-file-name))))
 148   nil)
 149
 150 ;;; To set the default file type on new files.
 151 (add-hook 'find-file-not-found-hooks 'find-file-not-found-set-buffer-file-type)
 152
 153 (defvar msdos-shells '("command.com" "4dos.com" "ndos.com")
 154   "*List of shells that use `/c' instead of `-c' and a backslashed command.")
 155
 156 (defconst register-name-alist
 157   '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5)
 158     (cflag . 6) (flags . 7)
 159     (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0))
 160     (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1))))
 161
 162 (defun make-register ()
 163   (make-vector 8 0))
 164
 165 (defun register-value (regs name)
 166   (let ((where (cdr (assoc name register-name-alist))))
 167     (cond ((consp where)
 168            (let ((tem (aref regs (car where))))
 169              (if (zerop (cdr where))
 170                  (% tem 256)
 171                (/ tem 256))))
 172           ((numberp where)
 173            (aref regs where))
 174           (t nil))))
 175
 176 (defun set-register-value (regs name value)
 177   (and (numberp value)
 178        (>= value 0)
 179        (let ((where (cdr (assoc name register-name-alist))))
 180          (cond ((consp where)
 181                 (let ((tem (aref regs (car where)))
 182                       (value (logand value 255)))
 183                   (aset regs
 184                         (car where)
 185                         (if (zerop (cdr where))
 186                             (logior (logand tem 65280) value)
 187                           (logior (logand tem 255) (lsh value 8))))))
 188                ((numberp where)
 189                 (aset regs where (logand value 65535))))))
 190   regs)
 191
 192 (defsubst intdos (regs)
 193   (int86 33 regs))
 194
 195 ;; Support for printing under MS-DOS, see lpr.el and ps-print.el.
 196 (defvar dos-printer "PRN"
 197   "*The name of a local MS-DOS device to which data is sent for printing.
 198 \(Note that PostScript files are sent to `dos-ps-printer', which see.\)
 199
 200 Typical non-default settings would be \"LPT1\" to \"LPT3\" for
 201 parallel printers, or \"COM1\" to \"COM4\" or \"AUX\" for serial
 202 printers.  You can also set it to a name of a file, in which
 203 case the output gets appended to that file.
 204 If you want to discard the printed output, set this to \"NUL\".")
 205
 206 (defun dos-print-region-function (start end
 207                                         &optional lpr-prog
 208                                         delete-text buf display rest)
 209   "MS-DOS-specific function to print the region on a printer.
 210 Writes the region to the device or file which is a value of
 211 `dos-printer' \(which see\).  Ignores any arguments beyond
 212 START and END."
 213
 214   (write-region start end dos-printer t 0)
 215   ;; Make each print-out start on a new page, but don't waste
 216   ;; paper if there was a form-feed at the end of this file.
 217   (if (not (char-equal (char-after (1- end)) ?\C-l))
 218       (write-region "\f" nil dos-printer t 0)))
 219
 220 ;; Set this to nil if you have a port of the `lpr' program and
 221 ;; you want to use it for printing.  If the default setting is
 222 ;; in effect, `lpr-command' and its switches are ignored when
 223 ;; printing with `lpr-xxx' and `print-xxx'.
 224 (setq print-region-function 'dos-print-region-function)
 225
 226 ;; Set this to nil if you have a port of the `pr' program
 227 ;; (e.g., from GNU Textutils), or if you have an `lpr'
 228 ;; program (see above) that can print page headers.
 229 ;; If `lpr-headers-switches' is non-nil (the default) and
 230 ;; `print-region-function' is set to `dos-print-region-function',
 231 ;; then requests to print page headers will be silently
 232 ;; ignored, and `print-buffer' and `print-region' produce
 233 ;; the same output as `lpr-buffer' and `lpr-region', accordingly.
 234 (setq lpr-headers-switches "(page headers are not supported)")
 235
 236 (defvar dos-ps-printer "PRN"
 237   "*Method for printing PostScript files under MS-DOS.
 238
 239 If the value is a string, then it is taken as the name of the
 240 device to which PostScript files are written.  By default it
 241 is the default printer device; typical non-default settings
 242 would be \"LPT1\" to \"LPT3\" for parallel printers, or \"COM1\"
 243 to \"COM4\" or \"AUX\" for serial printers.  You can also set it
 244 to a name of a file, in which case the output gets appended
 245 to that file.  \(Note that `ps-print' package already has
 246 facilities for printing to a file, so you might as well use
 247 them instead of changing the setting of this variable.\)  If
 248 you want to silently discard the printed output, set this to \"NUL\".
 249
 250 If the value is anything but a string, PostScript files will be
 251 piped to the program given by `ps-lpr-command', with switches
 252 given by `ps-lpr-switches', which see.")
 253
 254 (setq ps-lpr-command "gs")
 255
 256 (setq ps-lpr-switches '("-q" "-dNOPAUSE" "-sDEVICE=epson" "-r240x60"
 257                           "-sOutputFile=LPT1" "-"))
 258
 259 ;; Backward compatibility for obsolescent functions which
 260 ;; set screen size.
 261
 262 (defun mode25 ()
 263   "Changes the number of screen rows to 25."
 264   (interactive)
 265   (set-frame-size (selected-frame) 80 25))
 266
 267 (defun mode4350 ()
 268   "Changes the number of rows to 43 or 50.
 269 Emacs always tries to set the screen height to 50 rows first.
 270 If this fails, it will try to set it to 43 rows, on the assumption
 271 that your video hardware might not support 50-line mode."
 272   (interactive)
 273   (set-frame-size (selected-frame) 80 50)
 274   (if (eq (frame-height (selected-frame)) 50)
 275       nil  ; the original built-in function returned nil
 276     (set-frame-size (selected-frame) 80 43)))
 277
 278 (provide 'dos-fns)
 279
 280 ; dos-fns.el ends here