Avoid using string-to-multibyte in ispell.el

* lisp/textmodes/ispell.el (ispell-get-decoded-string): Use
decode-coding-string instead. Note that decode-coding-string returns a
string that satisfies multibyte-string-p even if its input is pure
ASCII and the third argument is t, so the result of
ispell-get-decoded-string is always a multibyte string.

1 files changed, 3 insertions, 13 deletions

diff --git a/lisp/textmodes/ispell.el b/lisp/textmodes/ispell.el
index e67e603e990..87a3b7aaa12 100644
--- a/lisp/textmodes/ispell.el
+++ b/lisp/textmodes/ispell.el
@@ -1485,25 +1485,15 @@ used as key in `ispell-local-dictionary-alist' and `ispell-dictionary-alist'.")
   "The name of the current personal dictionary, or nil for the default.
 This is passed to the Ispell process using the `-p' switch.")
 
-(defun ispell-decode-string (str)
-  "Decodes multibyte character strings."
-  (decode-coding-string str (ispell-get-coding-system)))
-
 ;; Return a string decoded from Nth element of the current dictionary.
 (defun ispell-get-decoded-string (n)
   "Get the decoded string in slot N of the descriptor of the current dict."
   (let* ((slot (or
                 (assoc ispell-current-dictionary ispell-local-dictionary-alist)
                 (assoc ispell-current-dictionary ispell-dictionary-alist)
-                (error "No data for dictionary \"%s\", neither in `ispell-local-dictionary-alist' nor in `ispell-dictionary-alist'"
-                       ispell-current-dictionary)))
-         (str (nth n slot)))
-    (when (and (> (length str) 0)
-               (not (multibyte-string-p str)))
-      (setq str (ispell-decode-string str))
-      (or (multibyte-string-p str)
-          (setq str (string-to-multibyte str))))
-    str))
+                (error "No data for dictionary \"%s\" in `ispell-local-dictionary-alist' or `ispell-dictionary-alist'"
+                       ispell-current-dictionary))))
+    (decode-coding-string (nth n slot) (ispell-get-coding-system) t)))
 
 (defun ispell-get-casechars ()
   (ispell-get-decoded-string 1))