1;;; dos-fns.el --- MS-Dos specific functions 2 3;; Copyright (C) 1991, 1993, 1995, 1996, 2001, 2002, 2003, 2004, 4;; 2005, 2006, 2007 Free Software Foundation, Inc. 5 6;; Maintainer: Morten Welinder <terra@diku.dk> 7;; Keywords: internal 8 9;; This file is part of GNU Emacs. 10 11;; GNU Emacs is free software; you can redistribute it and/or modify 12;; it under the terms of the GNU General Public License as published by 13;; the Free Software Foundation; either version 2, or (at your option) 14;; any later version. 15 16;; GNU Emacs is distributed in the hope that it will be useful, 17;; but WITHOUT ANY WARRANTY; without even the implied warranty of 18;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19;; GNU General Public License for more details. 20 21;; You should have received a copy of the GNU General Public License 22;; along with GNU Emacs; see the file COPYING. If not, write to the 23;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 24;; Boston, MA 02110-1301, USA. 25 26;;; Commentary: 27 28;; Part of this code is taken from (or derived from) demacs. 29 30;;; Code: 31 32;; This overrides a trivial definition in files.el. 33(defun convert-standard-filename (filename) 34 "Convert a standard file's name to something suitable for the current OS. 35This means to guarantee valid names and perhaps to canonicalize 36certain patterns. 37 38On Windows and DOS, replace invalid characters. On DOS, make 39sure to obey the 8.3 limitations. On Windows, turn Cygwin names 40into native names, and also turn slashes into backslashes if the 41shell requires it (see `w32-shell-dos-semantics')." 42 (if (or (not (stringp filename)) 43 ;; This catches the case where FILENAME is "x:" or "x:/" or 44 ;; "/", thus preventing infinite recursion. 45 (string-match "\\`\\([a-zA-Z]:\\)?[/\\]?\\'" filename)) 46 filename 47 (let ((flen (length filename))) 48 ;; If FILENAME has a trailing slash, remove it and recurse. 49 (if (memq (aref filename (1- flen)) '(?/ ?\\)) 50 (concat (convert-standard-filename 51 (substring filename 0 (1- flen))) 52 "/") 53 (let* (;; ange-ftp gets in the way for names like "/foo:bar". 54 ;; We need to inhibit all magic file names, because 55 ;; remote file names should never be passed through 56 ;; this function, as they are not meant for the local 57 ;; filesystem! 58 (file-name-handler-alist nil) 59 (dir 60 ;; If FILENAME is "x:foo", file-name-directory returns 61 ;; "x:/bar/baz", substituting the current working 62 ;; directory on drive x:. We want to be left with "x:" 63 ;; instead. 64 (if (and (< 1 flen) 65 (eq (aref filename 1) ?:) 66 (null (string-match "[/\\]" filename))) 67 (substring filename 0 2) 68 (file-name-directory filename))) 69 (dlen-m-1 (1- (length dir))) 70 (string (copy-sequence (file-name-nondirectory filename))) 71 (lastchar (aref string (1- (length string)))) 72 i firstdot) 73 (cond 74 ((msdos-long-file-names) 75 ;; Replace characters that are invalid even on Windows. 76 (while (setq i (string-match "[?*:<>|\"\000-\037]" string)) 77 (aset string i ?!))) 78 ((not (member string '("" "." ".."))) 79 ;; Change a leading period to a leading underscore. 80 (if (= (aref string 0) ?.) 81 (aset string 0 ?_)) 82 ;; If the name is longer than 8 chars, and doesn't have a 83 ;; period, and we have a dash or underscore that isn't too 84 ;; close to the beginning, change that to a period. This 85 ;; is so we could salvage more characters of the original 86 ;; name by pushing them into the extension. 87 (if (and (not (string-match "\\." string)) 88 (> (length string) 8) 89 ;; We don't gain anything if we put the period closer 90 ;; than 5 chars from the beginning (5 + 3 = 8). 91 (setq i (string-match "[-_]" string 5))) 92 (aset string i ?\.)) 93 ;; Get rid of invalid characters. 94 (while (setq i (string-match 95 "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]" 96 string)) 97 (aset string i ?_)) 98 ;; If we don't have a period in the first 8 chars, insert one. 99 ;; This enables to have 3 more characters from the original 100 ;; name in the extension. 101 (if (> (or (string-match "\\." string) (length string)) 102 8) 103 (setq string 104 (concat (substring string 0 8) 105 "." 106 (substring string 8)))) 107 (setq firstdot (or (string-match "\\." string) 108 (1- (length string)))) 109 ;; Truncate to 3 chars after the first period. 110 (if (> (length string) (+ firstdot 4)) 111 (setq string (substring string 0 (+ firstdot 4)))) 112 ;; Change all periods except the first one into underscores. 113 ;; (DOS doesn't allow more than one period.) 114 (while (string-match "\\." string (1+ firstdot)) 115 (setq i (string-match "\\." string (1+ firstdot))) 116 (aset string i ?_)) 117 ;; If the last character of the original filename was `~' or `#', 118 ;; make sure the munged name ends with it also. This is so that 119 ;; backup and auto-save files retain their telltale form. 120 (if (memq lastchar '(?~ ?#)) 121 (aset string (1- (length string)) lastchar)))) 122 (concat (if (and (stringp dir) 123 (memq (aref dir dlen-m-1) '(?/ ?\\))) 124 (concat (convert-standard-filename 125 (substring dir 0 dlen-m-1)) 126 "/") 127 (convert-standard-filename dir)) 128 string)))))) 129 130(defun dos-8+3-filename (filename) 131 "Truncate FILENAME to DOS 8+3 limits." 132 (if (or (not (stringp filename)) 133 (< (length filename) 5)) ; too short to give any trouble 134 filename 135 (let ((flen (length filename))) 136 ;; If FILENAME has a trailing slash, remove it and recurse. 137 (if (memq (aref filename (1- flen)) '(?/ ?\\)) 138 (concat (dos-8+3-filename (substring filename 0 (1- flen))) 139 "/") 140 (let* (;; ange-ftp gets in the way for names like "/foo:bar". 141 ;; We need to inhibit all magic file names, because 142 ;; remote file names should never be passed through 143 ;; this function, as they are not meant for the local 144 ;; filesystem! 145 (file-name-handler-alist nil) 146 (dir 147 ;; If FILENAME is "x:foo", file-name-directory returns 148 ;; "x:/bar/baz", substituting the current working 149 ;; directory on drive x:. We want to be left with "x:" 150 ;; instead. 151 (if (and (< 1 flen) 152 (eq (aref filename 1) ?:) 153 (null (string-match "[/\\]" filename))) 154 (substring filename 0 2) 155 (file-name-directory filename))) 156 (dlen-m-1 (1- (length dir))) 157 (string (copy-sequence (file-name-nondirectory filename))) 158 (strlen (length string)) 159 (lastchar (aref string (1- strlen))) 160 i firstdot) 161 (setq firstdot (string-match "\\." string)) 162 (cond 163 (firstdot 164 ;; Truncate the extension to 3 characters. 165 (if (> strlen (+ firstdot 4)) 166 (setq string (substring string 0 (+ firstdot 4)))) 167 ;; Truncate the basename to 8 characters. 168 (if (> firstdot 8) 169 (setq string (concat (substring string 0 8) 170 "." 171 (substring string (1+ firstdot)))))) 172 ((> strlen 8) 173 ;; No dot; truncate file name to 8 characters. 174 (setq string (substring string 0 8)))) 175 ;; If the last character of the original filename was `~', 176 ;; make sure the munged name ends with it also. This is so 177 ;; a backup file retains its final `~'. 178 (if (equal lastchar ?~) 179 (aset string (1- (length string)) lastchar)) 180 (concat (if (and (stringp dir) 181 (memq (aref dir dlen-m-1) '(?/ ?\\))) 182 (concat (dos-8+3-filename (substring dir 0 dlen-m-1)) 183 "/") 184 ;; Recurse to truncate the leading directories. 185 (dos-8+3-filename dir)) 186 string)))))) 187 188;; See dos-vars.el for defcustom. 189(defvar msdos-shells) 190 191;;; Override setting chosen at startup. 192(defun set-default-process-coding-system () 193 (setq default-process-coding-system 194 (if default-enable-multibyte-characters 195 '(undecided-dos . undecided-dos) 196 '(raw-text-dos . raw-text-dos)))) 197 198(add-hook 'before-init-hook 'set-default-process-coding-system) 199 200(defvar register-name-alist 201 '((ax . 0) (bx . 1) (cx . 2) (dx . 3) (si . 4) (di . 5) 202 (cflag . 6) (flags . 7) 203 (al . (0 . 0)) (bl . (1 . 0)) (cl . (2 . 0)) (dl . (3 . 0)) 204 (ah . (0 . 1)) (bh . (1 . 1)) (ch . (2 . 1)) (dh . (3 . 1)))) 205 206(defun make-register () 207 (make-vector 8 0)) 208 209(defun register-value (regs name) 210 (let ((where (cdr (assoc name register-name-alist)))) 211 (cond ((consp where) 212 (let ((tem (aref regs (car where)))) 213 (if (zerop (cdr where)) 214 (% tem 256) 215 (/ tem 256)))) 216 ((numberp where) 217 (aref regs where)) 218 (t nil)))) 219 220(defun set-register-value (regs name value) 221 (and (numberp value) 222 (>= value 0) 223 (let ((where (cdr (assoc name register-name-alist)))) 224 (cond ((consp where) 225 (let ((tem (aref regs (car where))) 226 (value (logand value 255))) 227 (aset regs 228 (car where) 229 (if (zerop (cdr where)) 230 (logior (logand tem 65280) value) 231 (logior (logand tem 255) (lsh value 8)))))) 232 ((numberp where) 233 (aset regs where (logand value 65535)))))) 234 regs) 235 236(defsubst intdos (regs) 237 (int86 33 regs)) 238 239;; Backward compatibility for obsolescent functions which 240;; set screen size. 241 242(defun mode25 () 243 "Changes the number of screen rows to 25." 244 (interactive) 245 (set-frame-size (selected-frame) 80 25)) 246 247(defun mode4350 () 248 "Changes the number of rows to 43 or 50. 249Emacs always tries to set the screen height to 50 rows first. 250If this fails, it will try to set it to 43 rows, on the assumption 251that your video hardware might not support 50-line mode." 252 (interactive) 253 (set-frame-size (selected-frame) 80 50) 254 (if (eq (frame-height (selected-frame)) 50) 255 nil ; the original built-in function returned nil 256 (set-frame-size (selected-frame) 80 43))) 257 258(provide 'dos-fns) 259 260;;; arch-tag: 00b03579-8ebb-4a02-8762-5c5a929774ad 261;;; dos-fns.el ends here 262