Fix bug #10284 with renaming a directory on MS-Windows.

 src/w32.c (sys_rename): Report EXDEV when rename of a directory
 fails because the target is on another logical disk.  (Bug#10284)

src/ChangeLog

+2012-01-07  LynX  <_LynX@bk.ru>  (tiny change)
+
+	* w32.c (sys_rename): Report EXDEV when rename of a directory
+	fails because the target is on another logical disk.  (Bug#10284)
+
 2012-01-07  David Benjamin  <davidben@mit.edu>  (tiny change)
 
 	* xterm.c (x_embed_request_focus): New function.

src/w32.c

@@ -2894,6 +2894,8 @@ sys_rename (const char * oldname, const char * newname)
 {
   BOOL result;
   char temp[MAX_PATH];
+  int newname_dev;
+  int oldname_dev;
 
   /* MoveFile on Windows 95 doesn't correctly change the short file name
      alias in a number of circumstances (it is not easy to predict when
@@ -2910,6 +2912,9 @@ sys_rename (const char * oldname, const char * newname)
 
   strcpy (temp, map_w32_filename (oldname, NULL));
 
+  /* volume_info is set indirectly by map_w32_filename.  */
+  oldname_dev = volume_info.serialnum;
+
   if (os_subtype == OS_WIN95)
     {
       char * o;
@@ -2953,13 +2958,38 @@ sys_rename (const char * oldname, const char * newname)
      all the permutations of shared or subst'd drives, etc.)  */
 
   newname = map_w32_filename (newname, NULL);
+
+  /* volume_info is set indirectly by map_w32_filename.  */
+  newname_dev = volume_info.serialnum;
+
   result = rename (temp, newname);
 
-  if (result < 0
-      && errno == EEXIST
-      && _chmod (newname, 0666) == 0
-      && _unlink (newname) == 0)
-    result = rename (temp, newname);
+  if (result < 0)
+    {
+
+      if (errno == EACCES
+	  && newname_dev != oldname_dev)
+	{
+	  /* The implementation of `rename' on Windows does not return
+	     errno = EXDEV when you are moving a directory to a
+	     different storage device (ex. logical disk).  It returns
+	     EACCES instead.  So here we handle such situations and
+	     return EXDEV.  */
+	  DWORD attributes;
+
+	  if ((attributes = GetFileAttributes (temp)) != -1
+	      && attributes & FILE_ATTRIBUTE_DIRECTORY)
+	    errno = EXDEV;
+	}
+      else if (errno == EEXIST)
+	{
+	  if (_chmod (newname, 0666) != 0)
+	    return result;
+	  if (_unlink (newname) != 0)
+	    return result;
+	  result = rename (temp, newname);
+	}
+    }
 
   return result;
 }