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317 lines
12 KiB
EmacsLisp
317 lines
12 KiB
EmacsLisp
;;; dos-fns.el --- MS-Dos specific functions
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;; Copyright (C) 1991, 1993, 1995-1996, 2001-2013 Free Software
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;; Foundation, Inc.
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;; Maintainer: Morten Welinder <terra@diku.dk>
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;; Keywords: internal
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;; Package: emacs
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Part of this code is taken from (or derived from) demacs.
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;;; Code:
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(declare-function int86 "dosfns.c")
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(declare-function msdos-long-file-names "msdos.c")
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;; See convert-standard-filename in files.el.
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(defun dos-convert-standard-filename (filename)
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"Convert a standard file's name to something suitable for MS-DOS.
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This means to guarantee valid names and perhaps to canonicalize
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certain patterns.
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This function is called by `convert-standard-filename'.
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On Windows and DOS, replace invalid characters. On DOS, make
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sure to obey the 8.3 limitations."
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(if (or (not (stringp filename))
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;; This catches the case where FILENAME is "x:" or "x:/" or
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;; "/", thus preventing infinite recursion.
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(string-match "\\`\\([a-zA-Z]:\\)?[/\\]?\\'" filename))
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filename
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(let ((flen (length filename)))
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;; If FILENAME has a trailing slash, remove it and recurse.
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(if (memq (aref filename (1- flen)) '(?/ ?\\))
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(concat (dos-convert-standard-filename
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(substring filename 0 (1- flen)))
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"/")
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(let* (;; ange-ftp gets in the way for names like "/foo:bar".
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;; We need to inhibit all magic file names, because
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;; remote file names should never be passed through
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;; this function, as they are not meant for the local
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;; filesystem!
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(file-name-handler-alist nil)
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(dir
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;; If FILENAME is "x:foo", file-name-directory returns
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;; "x:/bar/baz", substituting the current working
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;; directory on drive x:. We want to be left with "x:"
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;; instead.
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(if (and (< 1 flen)
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(eq (aref filename 1) ?:)
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(null (string-match "[/\\]" filename)))
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(substring filename 0 2)
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(file-name-directory filename)))
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(dlen-m-1 (1- (length dir)))
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(string (copy-sequence (file-name-nondirectory filename)))
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(lastchar (aref string (1- (length string))))
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i firstdot)
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(cond
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((msdos-long-file-names)
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;; Replace characters that are invalid even on Windows.
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(while (setq i (string-match "[?*:<>|\"\000-\037]" string))
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(aset string i ?!)))
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((not (member string '("" "." "..")))
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;; Change a leading period to a leading underscore.
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(if (= (aref string 0) ?.)
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(aset string 0 ?_))
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;; If the name is longer than 8 chars, and doesn't have a
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;; period, and we have a dash or underscore that isn't too
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;; close to the beginning, change that to a period. This
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;; is so we could salvage more characters of the original
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;; name by pushing them into the extension.
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(if (and (not (string-match "\\." string))
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(> (length string) 8)
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;; We don't gain anything if we put the period closer
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;; than 5 chars from the beginning (5 + 3 = 8).
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(setq i (string-match "[-_]" string 5)))
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(aset string i ?\.))
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;; Get rid of invalid characters.
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(while (setq i (string-match
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"[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]"
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string))
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(aset string i ?_))
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;; If we don't have a period in the first 8 chars, insert one.
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;; This enables to have 3 more characters from the original
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;; name in the extension.
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(if (> (or (string-match "\\." string) (length string))
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8)
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(setq string
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(concat (substring string 0 8)
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"."
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(substring string 8))))
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(setq firstdot (or (string-match "\\." string)
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(1- (length string))))
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;; Truncate to 3 chars after the first period.
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(if (> (length string) (+ firstdot 4))
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(setq string (substring string 0 (+ firstdot 4))))
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;; Change all periods except the first one into underscores.
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;; (DOS doesn't allow more than one period.)
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(while (string-match "\\." string (1+ firstdot))
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(setq i (string-match "\\." string (1+ firstdot)))
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(aset string i ?_))
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;; If the last character of the original filename was `~' or `#',
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;; make sure the munged name ends with it also. This is so that
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;; backup and auto-save files retain their telltale form.
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(if (memq lastchar '(?~ ?#))
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(aset string (1- (length string)) lastchar))))
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(concat (if (and (stringp dir)
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(memq (aref dir dlen-m-1) '(?/ ?\\)))
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(concat (dos-convert-standard-filename
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(substring dir 0 dlen-m-1))
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"/")
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(dos-convert-standard-filename dir))
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string))))))
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(defun dos-8+3-filename (filename)
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"Truncate FILENAME to DOS 8+3 limits."
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(if (or (not (stringp filename))
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(< (length filename) 5)) ; too short to give any trouble
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filename
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(let ((flen (length filename)))
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;; If FILENAME has a trailing slash, remove it and recurse.
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(if (memq (aref filename (1- flen)) '(?/ ?\\))
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(concat (dos-8+3-filename (substring filename 0 (1- flen)))
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"/")
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(let* (;; ange-ftp gets in the way for names like "/foo:bar".
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;; We need to inhibit all magic file names, because
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;; remote file names should never be passed through
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;; this function, as they are not meant for the local
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;; filesystem!
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(file-name-handler-alist nil)
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(dir
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;; If FILENAME is "x:foo", file-name-directory returns
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;; "x:/bar/baz", substituting the current working
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;; directory on drive x:. We want to be left with "x:"
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;; instead.
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(if (and (< 1 flen)
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(eq (aref filename 1) ?:)
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(null (string-match "[/\\]" filename)))
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(substring filename 0 2)
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(file-name-directory filename)))
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(dlen-m-1 (1- (length dir)))
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(string (copy-sequence (file-name-nondirectory filename)))
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(strlen (length string))
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(lastchar (aref string (1- strlen)))
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firstdot)
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(setq firstdot (string-match "\\." string))
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(cond
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(firstdot
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;; Truncate the extension to 3 characters.
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(if (> strlen (+ firstdot 4))
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(setq string (substring string 0 (+ firstdot 4))))
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;; Truncate the basename to 8 characters.
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(if (> firstdot 8)
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(setq string (concat (substring string 0 8)
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"."
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(substring string (1+ firstdot))))))
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((> strlen 8)
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;; No dot; truncate file name to 8 characters.
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(setq string (substring string 0 8))))
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;; If the last character of the original filename was `~',
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;; make sure the munged name ends with it also. This is so
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;; a backup file retains its final `~'.
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(if (equal lastchar ?~)
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(aset string (1- (length string)) lastchar))
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(concat (if (and (stringp dir)
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(memq (aref dir dlen-m-1) '(?/ ?\\)))
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(concat (dos-8+3-filename (substring dir 0 dlen-m-1))
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"/")
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;; Recurse to truncate the leading directories.
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(dos-8+3-filename dir))
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string))))))
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;; This is for the sake of standard file names elsewhere in Emacs that
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;; are defined as constant strings or via defconst, and whose
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;; conversion via `dos-convert-standard-filename' does not give good
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;; enough results.
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(defun dosified-file-name (file-name)
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"Return a variant of FILE-NAME that is valid on MS-DOS filesystems.
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This function is for those rare cases where `dos-convert-standard-filename'
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does not do a job that is good enough, e.g. if you need to preserve the
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file-name extension. It recognizes only certain specific file names
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that are used in Emacs Lisp sources; any other file name will be
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returned unaltered."
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(cond
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;; See files.el:dir-locals-file.
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((string= file-name ".dir-locals.el")
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"_dir-locals.el")
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(t
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file-name)))
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;; See dos-vars.el for defcustom.
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(defvar msdos-shells)
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;; Override settings chosen at startup.
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(defun dos-set-default-process-coding-system ()
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(setq default-process-coding-system
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(if (default-value 'enable-multibyte-characters)
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'(undecided-dos . undecided-dos)
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'(raw-text-dos . raw-text-dos))))
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(add-hook 'before-init-hook 'dos-set-default-process-coding-system)
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;; File names defined in preloaded packages can be incorrect or
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;; invalid if long file names were available during dumping, but not
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;; at runtime, or vice versa, and if the default file name begins with
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;; a period. Their defcustom's need to be reevaluated at startup. To
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;; see if the list of defcustom's below is up to date, run the command
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;; "M-x apropos-value RET ~/\. RET".
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(defun dos-reevaluate-defcustoms ()
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;; This is not needed in Emacs 23.2 and later, as trash-directory is
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;; initialized as nil. But something like this might become
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;; necessary in the future, so I'm keeping it here as a reminder.
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;(custom-reevaluate-setting 'trash-directory)
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)
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(add-hook 'before-init-hook 'dos-reevaluate-defcustoms)
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(define-obsolete-variable-alias
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'register-name-alist 'dos-register-name-alist "24.1")
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(defvar dos-register-name-alist
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'((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5)
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(cflag . 6) (flags . 7)
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(al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0))
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(ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1))))
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(defun dos-make-register ()
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(make-vector 8 0))
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(define-obsolete-function-alias 'make-register 'dos-make-register "24.1")
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(defun dos-register-value (regs name)
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(let ((where (cdr (assoc name dos-register-name-alist))))
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(cond ((consp where)
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(let ((tem (aref regs (car where))))
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(if (zerop (cdr where))
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(% tem 256)
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(/ tem 256))))
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((numberp where)
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(aref regs where))
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(t nil))))
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(define-obsolete-function-alias 'register-value 'dos-register-value "24.1")
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(defun dos-set-register-value (regs name value)
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(and (numberp value)
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(>= value 0)
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(let ((where (cdr (assoc name dos-register-name-alist))))
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(cond ((consp where)
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(let ((tem (aref regs (car where)))
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(value (logand value 255)))
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(aset regs
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(car where)
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(if (zerop (cdr where))
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(logior (logand tem 65280) value)
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(logior (logand tem 255) (lsh value 8))))))
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((numberp where)
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(aset regs where (logand value 65535))))))
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regs)
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(define-obsolete-function-alias
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'set-register-value 'dos-set-register-value "24.1")
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(defsubst dos-intdos (regs)
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"Issue the DOS Int 21h with registers REGS.
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REGS should be a vector produced by `dos-make-register'
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and `dos-set-register-value', which see."
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(int86 33 regs))
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(define-obsolete-function-alias 'intdos 'dos-intdos "24.1")
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;; Backward compatibility for obsolescent functions which
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;; set screen size.
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(defun dos-mode25 ()
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"Changes the number of screen rows to 25."
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(interactive)
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(set-frame-size (selected-frame) 80 25))
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(define-obsolete-function-alias 'mode25 'dos-mode25 "24.1")
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(defun dos-mode4350 ()
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"Changes the number of rows to 43 or 50.
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Emacs always tries to set the screen height to 50 rows first.
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If this fails, it will try to set it to 43 rows, on the assumption
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that your video hardware might not support 50-line mode."
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(interactive)
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(set-frame-size (selected-frame) 80 50)
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(if (eq (frame-height (selected-frame)) 50)
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nil ; the original built-in function returned nil
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(set-frame-size (selected-frame) 80 43)))
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(define-obsolete-function-alias 'mode4350 'dos-mode4350 "24.1")
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(provide 'dos-fns)
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;;; dos-fns.el ends here
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