* util.c (mblen): fix overrun. [ruby-dev:22672]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_8@5587 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/util.c b/util.c
index cb0b4912f..437632861 100644
--- a/util.c
+++ b/util.c
@@ -296,6 +296,8 @@ mblen(const char *s, size_t n)
     if (s) {
 	if (n == 0 || *s == 0)
 	    return 0;
+	else if (!s[1])
+	    return 1;
 	return dbcs_table[(unsigned char)*s] + 1;
     }
     else