(make-backup-file-name): Check msdos-long-file-names.

(basic-save-buffer-1, make-auto-save-file-name): Likewise.

diff --git a/lisp/files.el b/lisp/files.el
index 1aaf22348bdbe5334f9a506ae86500ee963c5fa7..eb2b3ed9c9d6c86ceabd9018979fb80122de0577 100644 (file)
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -1667,7 +1667,8 @@ The extension, in a file name, is the part that follows the last `.'."
 (defun make-backup-file-name (file)
   "Create the non-numeric backup file name for FILE.
 This is a separate function so you can redefine it for customization."
-  (if (eq system-type 'ms-dos)
+  (if (and (eq system-type 'ms-dos)
+          (not (msdos-long-file-names)))
       (let ((fn (file-name-nondirectory file)))
        (concat (file-name-directory file)
                (or
@@ -1920,7 +1921,8 @@ After saving the buffer, run `after-save-hook'."
            ;; Find the temporary name to write under.
            (while nogood
              (setq tempname (format
-                             (if (eq system-type 'ms-dos)
+                             (if (and (eq system-type 'ms-dos)
+                                      (not (msdos-long-file-names)))
                                  "%s#%d.tm#" ; MSDOS limits files to 8+3
                                "%s#tmp#%d")
                              dir i))
@@ -2419,7 +2421,8 @@ Does not consider `auto-save-visited-file-name' as that variable is checked
 before calling this function.  You can redefine this for customization.
 See also `auto-save-file-name-p'."
   (if buffer-file-name
-      (if (eq system-type 'ms-dos)
+      (if (and (eq system-type 'ms-dos)
+              (not (msdos-long-file-names)))
          (let ((fn (file-name-nondirectory buffer-file-name)))
                (string-match "\\`\\([^.]+\\)\\(\\.\\(..?\\)?.?\\|\\)\\'" fn)
            (concat (file-name-directory buffer-file-name)