mountlist: add support for deallocating returned list entries

* lib/mountlist.c (free_mount_entry): A new exported function
to deallocate a mount list entry.
* lib/mountlist.h: Declare the new function.
(read_file_system_list): Refactor to use the new deallocation function.
Suggested by Anton Ovchinnikov.

3 files changed, 21 insertions, 5 deletions

diff --git a/ChangeLog b/ChangeLog
index 4247ec86ab..39fd40bf42 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2013-07-09  Pádraig Brady  <P@draigBrady.com>
+
+	mountlist: add support for deallocating returned list entries
+	* lib/mountlist.c (free_mount_entry): A new exported function
+	to deallocate a mount list entry.
+	(read_file_system_list): Refactor to use the new deallocation function.
+	Suggested by Anton Ovchinnikov.
+
 2013-07-07  Paul Eggert  <eggert@cs.ucla.edu>
 
 	stdalign, verify: port to FreeBSD 9.1, to C11, and to C++11
diff --git a/lib/mountlist.c b/lib/mountlist.c
index d8d54646c1..30f4286130 100644
--- a/lib/mountlist.c
+++ b/lib/mountlist.c
@@ -961,11 +961,7 @@ read_file_system_list (bool need_fs_type)
     while (mount_list)
       {
         me = mount_list->me_next;
-        free (mount_list->me_devname);
-        free (mount_list->me_mountdir);
-        if (mount_list->me_type_malloced)
-          free (mount_list->me_type);
-        free (mount_list);
+        free_mount_entry (mount_list);
         mount_list = me;
       }
 
@@ -973,3 +969,14 @@ read_file_system_list (bool need_fs_type)
     return NULL;
   }
 }
+
+/* Free a mount entry as returned from read_file_system_list ().  */
+
+void free_mount_entry (struct mount_entry *me)
+{
+  free (me->me_devname);
+  free (me->me_mountdir);
+  if (me->me_type_malloced)
+    free (me->me_type);
+  free (me);
+}
diff --git a/lib/mountlist.h b/lib/mountlist.h
index ffdcc02b1a..55877e2399 100644
--- a/lib/mountlist.h
+++ b/lib/mountlist.h
@@ -36,5 +36,6 @@ struct mount_entry
 };
 
 struct mount_entry *read_file_system_list (bool need_fs_type);
+void free_mount_entry (struct mount_entry *entry);
 
 #endif