unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
blob 42a12ef84cfe2f97a5c38a439be03a49c4b06faf 11850 bytes (raw)
name: lisp/dos-fns.el 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
 
;;; dos-fns.el --- MS-Dos specific functions -*- lexical-binding: t -*-

;; Copyright (C) 1991, 1993, 1995-1996, 2001-2016 Free Software
;; Foundation, Inc.

;; Maintainer: Morten Welinder <terra@diku.dk>
;; Keywords: internal
;; Package: emacs

;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Part of this code is taken from (or derived from) demacs.

;;; Code:

(declare-function int86 "dosfns.c")
(declare-function msdos-long-file-names "msdos.c")

;; See convert-standard-filename in files.el.
(defun dos-convert-standard-filename (filename)
  "Convert a standard file's name to something suitable for MS-DOS.
This means to guarantee valid names and perhaps to canonicalize
certain patterns.

This function is called by `convert-standard-filename'.

On Windows and DOS, replace invalid characters.  On DOS, make
sure to obey the 8.3 limitations."
  (if (or (not (stringp filename))
	  ;; This catches the case where FILENAME is "x:" or "x:/" or
	  ;; "/", thus preventing infinite recursion.
	  (string-match "\\`\\([a-zA-Z]:\\)?[/\\]?\\'" filename))
      filename
    (let ((flen (length filename)))
      ;; If FILENAME has a trailing slash, remove it and recurse.
      (if (memq (aref filename (1- flen)) '(?/ ?\\))
	  (concat (dos-convert-standard-filename
		   (substring filename 0 (1- flen)))
		  "/")
	(let* (;; ange-ftp gets in the way for names like "/foo:bar".
	       ;; We need to inhibit all magic file names, because
	       ;; remote file names should never be passed through
	       ;; this function, as they are not meant for the local
	       ;; filesystem!
	       (file-name-handler-alist nil)
	       (dir
		;; If FILENAME is "x:foo", file-name-directory returns
		;; "x:/bar/baz", substituting the current working
		;; directory on drive x:.  We want to be left with "x:"
		;; instead.
		(if (and (< 1 flen)
			 (eq (aref filename 1) ?:)
			 (null (string-match "[/\\]" filename)))
		    (substring filename 0 2)
		  (file-name-directory filename)))
	       (dlen-m-1 (1- (length dir)))
	       (string (copy-sequence (file-name-nondirectory filename)))
	       (lastchar (aref string (1- (length string))))
	       i firstdot)
	  (cond
	   ((msdos-long-file-names)
	    ;; Replace characters that are invalid even on Windows.
	    (while (setq i (string-match "[?*:<>|\"\000-\037]" string))
	      (aset string i ?!)))
	   ((not (member string '("" "." "..")))
	    ;; Change a leading period to a leading underscore.
	    (if (= (aref string 0) ?.)
		(aset string 0 ?_))
	    ;; If the name is longer than 8 chars, and doesn't have a
	    ;; period, and we have a dash or underscore that isn't too
	    ;; close to the beginning, change that to a period.  This
	    ;; is so we could salvage more characters of the original
	    ;; name by pushing them into the extension.
	    (if (and (not (string-match "\\." string))
		     (> (length string) 8)
		     ;; We don't gain anything if we put the period closer
		     ;; than 5 chars from the beginning (5 + 3 = 8).
		     (setq i (string-match "[-_]" string 5)))
		(aset string i ?\.))
	    ;; 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 in the first 8 chars, insert one.
	    ;; This enables having 3 more characters from the original
	    ;; name in the extension.
	    (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.
	    ;; (DOS doesn't allow more than one period.)
	    (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 `~' or `#',
	    ;; make sure the munged name ends with it also.  This is so that
	    ;; backup and auto-save files retain their telltale form.
	    (if (memq lastchar '(?~ ?#))
		(aset string (1- (length string)) lastchar))))
	  (concat (if (and (stringp dir)
			   (memq (aref dir dlen-m-1) '(?/ ?\\)))
		      (concat (dos-convert-standard-filename
			       (substring dir 0 dlen-m-1))
			      "/")
		    (dos-convert-standard-filename dir))
		  string))))))

(defun dos-8+3-filename (filename)
  "Truncate FILENAME to DOS 8+3 limits."
  (if (or (not (stringp filename))
	  (< (length filename) 5))	; too short to give any trouble
      filename
    (let ((flen (length filename)))
      ;; If FILENAME has a trailing slash, remove it and recurse.
      (if (memq (aref filename (1- flen)) '(?/ ?\\))
	  (concat (dos-8+3-filename (substring filename 0 (1- flen)))
		  "/")
	(let* (;; ange-ftp gets in the way for names like "/foo:bar".
	       ;; We need to inhibit all magic file names, because
	       ;; remote file names should never be passed through
	       ;; this function, as they are not meant for the local
	       ;; filesystem!
	       (file-name-handler-alist nil)
	       (dir
		;; If FILENAME is "x:foo", file-name-directory returns
		;; "x:/bar/baz", substituting the current working
		;; directory on drive x:.  We want to be left with "x:"
		;; instead.
		(if (and (< 1 flen)
			 (eq (aref filename 1) ?:)
			 (null (string-match "[/\\]" filename)))
		    (substring filename 0 2)
		  (file-name-directory filename)))
	       (dlen-m-1 (1- (length dir)))
	       (string (copy-sequence (file-name-nondirectory filename)))
	       (strlen (length string))
	       (lastchar (aref string (1- strlen)))
	       firstdot)
	  (setq firstdot (string-match "\\." string))
	  (cond
	   (firstdot
	    ;; Truncate the extension to 3 characters.
	    (if (> strlen (+ firstdot 4))
		(setq string (substring string 0 (+ firstdot 4))))
	    ;; Truncate the basename to 8 characters.
	    (if (> firstdot 8)
		(setq string (concat (substring string 0 8)
				     "."
				     (substring string (1+ firstdot))))))
	   ((> strlen 8)
	    ;; No dot; truncate file name to 8 characters.
	    (setq string (substring string 0 8))))
	  ;; If the last character of the original filename was `~',
	  ;; make sure the munged name ends with it also.  This is so
	  ;; a backup file retains its final `~'.
	  (if (equal lastchar ?~)
	      (aset string (1- (length string)) lastchar))
	  (concat (if (and (stringp dir)
			   (memq (aref dir dlen-m-1) '(?/ ?\\)))
		      (concat (dos-8+3-filename (substring dir 0 dlen-m-1))
			      "/")
		    ;; Recurse to truncate the leading directories.
		    (dos-8+3-filename dir))
		  string))))))

;; This is for the sake of standard file names elsewhere in Emacs that
;; are defined as constant strings or via defconst, and whose
;; conversion via `dos-convert-standard-filename' does not give good
;; enough results.
(defun dosified-file-name (file-name)
  "Return a variant of FILE-NAME that is valid on MS-DOS filesystems.

This function is for those rare cases where `dos-convert-standard-filename'
does not do a job that is good enough, e.g. if you need to preserve the
file-name extension.  It recognizes only certain specific file names
that are used in Emacs Lisp sources; any other file name will be
returned unaltered."
  (cond
   ;; See files.el:dir-locals-file.
   ((string= file-name ".dir-locals")
    "_dir-locals")
   (t
    file-name)))

;; See dos-vars.el for defcustom.
(defvar msdos-shells)

;; Override settings chosen at startup.
(defun dos-set-default-process-coding-system ()
  (setq default-process-coding-system
	(if (default-value 'enable-multibyte-characters)
	    '(undecided-dos . undecided-dos)
	  '(raw-text-dos . raw-text-dos))))

(add-hook 'before-init-hook 'dos-set-default-process-coding-system)

;; File names defined in preloaded packages can be incorrect or
;; invalid if long file names were available during dumping, but not
;; at runtime, or vice versa, and if the default file name begins with
;; a period.  Their defcustom's need to be reevaluated at startup.  To
;; see if the list of defcustom's below is up to date, run the command
;; "M-x apropos-value RET ~/\. RET".
(defun dos-reevaluate-defcustoms ()
  ;; This is not needed in Emacs 23.2 and later, as trash-directory is
  ;; initialized as nil.  But something like this might become
  ;; necessary in the future, so I'm keeping it here as a reminder.
  ;(custom-reevaluate-setting 'trash-directory)
  )

(add-hook 'before-init-hook 'dos-reevaluate-defcustoms)

(define-obsolete-variable-alias
  'register-name-alist 'dos-register-name-alist "24.1")

(defvar dos-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 dos-make-register ()
  (make-vector 8 0))

(define-obsolete-function-alias 'make-register 'dos-make-register "24.1")

(defun dos-register-value (regs name)
  (let ((where (cdr (assoc name dos-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))))

(define-obsolete-function-alias 'register-value 'dos-register-value "24.1")

(defun dos-set-register-value (regs name value)
  (and (numberp value)
       (>= value 0)
       (let ((where (cdr (assoc name dos-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)

(define-obsolete-function-alias
  'set-register-value 'dos-set-register-value "24.1")

(defsubst dos-intdos (regs)
  "Issue the DOS Int 21h with registers REGS.

REGS should be a vector produced by `dos-make-register'
and `dos-set-register-value', which see."
  (int86 33 regs))

(define-obsolete-function-alias 'intdos 'dos-intdos "24.1")

;; Backward compatibility for obsolescent functions which
;; set screen size.

(defun dos-mode25 ()
  "Changes the number of screen rows to 25."
  (interactive)
  (set-frame-size (selected-frame) 80 25))

(define-obsolete-function-alias 'mode25 'dos-mode25 "24.1")

(defun dos-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)))

(define-obsolete-function-alias 'mode4350 'dos-mode4350 "24.1")

(provide 'dos-fns)

;;; dos-fns.el ends here

debug log:

solving 42a12ef ...
found 42a12ef in https://yhetil.org/emacs-devel/20160813181832.GA15753@holos.localdomain/
found 7188ae0 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 7188ae0bce7346e032dff8bf71dbaec1ca3f6950	lisp/dos-fns.el

applying [1/1] https://yhetil.org/emacs-devel/20160813181832.GA15753@holos.localdomain/
diff --git a/lisp/dos-fns.el b/lisp/dos-fns.el
index 7188ae0..42a12ef 100644

Checking patch lisp/dos-fns.el...
Applied patch lisp/dos-fns.el cleanly.

index at:
100644 42a12ef84cfe2f97a5c38a439be03a49c4b06faf	lisp/dos-fns.el

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).