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

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5587 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -6,6 +6,8 @@ Thu Jan 29 23:11:57 2004  WATANABE Hirofumi  <eban@ruby-lang.org>
 	* bcc32/Makefile.sub, win32/Makefile.sub, wince/Makefile.sub (DLEXT2):
 	  ditto.
 
+	* util.c (mblen): fix overrun.  [ruby-dev:22672]
+
 Thu Jan 29 22:41:53 2004  Dave Thomas  <dave@pragprog.com>
 
 	* lib/rdoc/generators/html_generator.rb: Allow 'link:' in Tidylinks.

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