1 files changed, 2 insertions, 2 deletions

diff --git a/lib/sitecing_util.cc b/lib/sitecing_util.cc
index 5466b28..f892a60 100644
--- a/lib/sitecing_util.cc
+++ b/lib/sitecing_util.cc
@@ -53,19 +53,19 @@ namespace sitecing {
         if(notslash<rv.length())
             rv.erase(notslash); // XXX: check the logic of stripping/not strippling trailing slash
         return rv;
     }
 
     string strip_prefix(const string& str,const string& prefix) {
-        if(str.compare(0,prefix.length(),prefix))
+        if( (str.length()<prefix.length()) || str.compare(0,prefix.length(),prefix))
             throw utility_no_prefix(CODEPOINT,"no such prefix");
         return str.substr(prefix.length());
     }
 
     string strip_suffix(const string& str,const string& suffix) {
-        if(str.compare(str.length()-suffix.length(),suffix.length(),suffix))
+        if( (str.length()<suffix.length()) || str.compare(str.length()-suffix.length(),suffix.length(),suffix))
             throw utility_no_suffix(CODEPOINT,"no such suffix");
         return str.substr(0,str.length()-suffix.length());
     }
 
     string dir_name(const string& filename) {
         string::size_type sl = filename.find_last_of('/');