Revert last change.

src/ChangeLog

@@ -2,9 +2,6 @@
 
 	* dispnew.c (adjust_glyph_matrix): Initialize window_height.
 
-	* fileio.c (Fexpand_file_name): Decode home directory names.
-	(Fsubstitute_in_file_name): Decode substituted variables.
-
 2008-03-03  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
 
 	* xdisp.c (handle_single_display_spec): Undo 2007-10-16 changes.

src/fileio.c

@@ -1408,19 +1408,6 @@ See also the function `substitute-in-file-name'.  */)
 	}
     }
 
-  /* Environment variables and pwnam entries may need decoding.  */
-  if (newdir)
-    {
-      Lisp_Object orig, decoded;
-      orig = make_unibyte_string (newdir, strlen (newdir));
-      decoded = DECODE_FILE (orig);
-      if (decoded != orig)
-        {
-          newdir = SDATA (decoded);
-          multibyte = 1;
-        }
-    }
-
 #ifdef DOS_NT
   /* On DOS and Windows, nm is absolute if a drive name was specified;
      use the drive's current directory as the prefix if needed.  */
@@ -2162,14 +2149,11 @@ duplicates what `expand-file-name' does.  */)
   unsigned char *target = NULL;
   int total = 0;
   int substituted = 0;
-  int multibyte;
   unsigned char *xnm;
   Lisp_Object handler;
 
   CHECK_STRING (filename);
 
-  multibyte = STRING_MULTIBYTE (filename);
-
   /* If the file name has special constructs in it,
      call the corresponding file handler.  */
   handler = Ffind_file_name_handler (filename, Qsubstitute_in_file_name);
@@ -2191,7 +2175,8 @@ duplicates what `expand-file-name' does.  */)
        again.  Important with filenames like "/home/foo//:/hello///there"
        which whould substitute to "/:/hello///there" rather than "/there".  */
     return Fsubstitute_in_file_name
-      (make_specified_string (p, -1, endp - p, multibyte));
+      (make_specified_string (p, -1, endp - p,
+			      STRING_MULTIBYTE (filename)));
 
 #ifdef VMS
   return filename;
@@ -2242,10 +2227,7 @@ duplicates what `expand-file-name' does.  */)
 	o = (unsigned char *) egetenv (target);
 	if (o)
 	  {
-            Lisp_Object orig, decoded;
-            orig = make_unibyte_string (o, strlen (o));
-            decoded = DECODE_FILE (orig);
-	    total += SBYTES (decoded);
+	    total += strlen (o);
 	    substituted = 1;
 	  }
 	else if (*p == '}')
@@ -2303,26 +2285,21 @@ duplicates what `expand-file-name' does.  */)
 	    *x++ = '$';
 	    strcpy (x, target); x+= strlen (target);
 	  }
-	else
+	else if (STRING_MULTIBYTE (filename))
 	  {
-            Lisp_Object orig, decoded;
-            orig = make_unibyte_string (o, strlen (o));
-            decoded = DECODE_FILE (orig);
-            strncpy (x, SDATA (decoded), SBYTES (decoded));
-            x += SBYTES (decoded);
-
-            /* If environment variable needed decoding, return value
-               needs to be multibyte.  */
-            if (decoded != orig)
-              multibyte = 1;
+	    /* If the original string is multibyte,
+	       convert what we substitute into multibyte.  */
+	    while (*o)
+	      {
+		int c = unibyte_char_to_multibyte (*o++);
+		x += CHAR_STRING (c, x);
+	      }
 	  }
-#if 0
 	else
 	  {
 	    strcpy (x, o);
 	    x += strlen (o);
 	  }
-#endif
       }
 
   *x = 0;
@@ -2334,7 +2311,7 @@ duplicates what `expand-file-name' does.  */)
        need to quote some $ to $$ first.  */
     xnm = p;
 
-  return make_specified_string (xnm, -1, x - xnm, multibyte);
+  return make_specified_string (xnm, -1, x - xnm, STRING_MULTIBYTE (filename));
 
  badsubst:
   error ("Bad format environment-variable substitution");