* file.c (file_expand_path): applied a patch from Nobuhiro Tachino

  in [ruby-dev:35948].  fix #491

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@19201 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 2 deletions

diff --git a/file.c b/file.c
index 33327a6f9..dbaafd2e8 100644
--- a/file.c
+++ b/file.c
@@ -2728,8 +2728,7 @@ file_expand_path(VALUE fname, VALUE dname, int abs_mode, VALUE result)
     if (p > buf && p[-1] == '/')
 	--p;
     else {
-	++buflen;
-	BUFCHECK(bdiff >= buflen);
+	BUFCHECK(bdiff + 1 >= buflen);
 	*p = '/';
     }