2 files changed, 5 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index c69bb03994..45f11b6413 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Aug  5 06:42:31 2010  Tanaka Akira  <akr@fsij.org>
+
+	* file.c (realpath_rec): call rb_str_modify before rb_str_set_len.
+
 Wed Aug  4 19:37:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (rb_str_set_len): rb_str_modify cannot work before the
diff --git a/file.c b/file.c
index 712d60ef45..b541a7dba0 100644
--- a/file.c
+++ b/file.c
@@ -3229,6 +3229,7 @@ realpath_rec(long *prefixlenp, VALUE *resolvedp, char *unresolved, VALUE loopche
                 char *resolved_names = RSTRING_PTR(*resolvedp) + *prefixlenp;
                 char *lastsep = rb_path_last_separator(resolved_names);
                 long len = lastsep ? lastsep - resolved_names : 0;
+                rb_str_modify(*resolvedp);
                 rb_str_set_len(*resolvedp, *prefixlenp + len);
             }
         }