added util::attr_escape

escaping string for inclusion into x(ht)ml attributes

Signed-off-by: Michael Krelin <hacker@klever.net>

2 files changed, 26 insertions, 0 deletions

diff --git a/include/opkele/util.h b/include/opkele/util.h
index 6f3ddf6..719f951 100644
--- a/include/opkele/util.h
+++ b/include/opkele/util.h
@@ -91,24 +91,31 @@ namespace opkele {
          */
         time_t w3c_to_time(const string& w);
 
         /**
          * Encode string to the representation suitable for using in URL.
          * @param str string to encode
          * @return encoded string
          * @throw failed_conversion in case of failure
          */
         string url_encode(const string& str);
 
         /**
+         * Make string suitable for using as x(ht)ml attribute.
+         * @param str string to escape
+         * @return escaped string
+         */
+        string attr_escape(const string& str);
+
+        /**
          * Convert number to string
          * @param l number
          * @return string representation
          * @throw failed_conversion in case of failure
          */
         string long_to_string(long l);
         /**
          * Convert string to number
          * @param s string, containing the number
          * @return the number
          * @throw failed_conversion in case of failure
          */
diff --git a/lib/util.cc b/lib/util.cc
index 54d6535..b7bc437 100644
--- a/lib/util.cc
+++ b/lib/util.cc
@@ -152,24 +152,43 @@ namespace opkele {
          *
          */
 
         string url_encode(const string& str) {
             char * t = curl_escape(str.c_str(),str.length());
             if(!t)
                 throw failed_conversion(OPKELE_CP_ "failed to curl_escape()");
             string rv(t);
             curl_free(t);
             return rv;
         }
 
+        string attr_escape(const string& str) {
+            static const char *unsafechars = "<>&\n\"'";
+            string rv;
+            string::size_type p=0;
+            while(true) {
+                string::size_type us = str.find_first_of(unsafechars,p);
+                if(us==string::npos) {
+                    if(p!=str.length())
+                        rv.append(str,p,str.length()-p);
+                    return rv;
+                }
+                rv.append(str,p,us-p);
+                rv += "&#";
+                rv += long_to_string((long)str[us]);
+                rv += ';';
+                p = us+1;
+            }
+        }
+
         string long_to_string(long l) {
             char rv[32];
             int r=snprintf(rv,sizeof(rv),"%ld",l);
             if(r<0 || r>=(int)sizeof(rv))
                 throw failed_conversion(OPKELE_CP_ "failed to snprintf()");
             return rv;
         }
 
         long string_to_long(const string& s) {
             char *endptr = 0;
             long rv = strtol(s.c_str(),&endptr,10);
             if((!endptr) || endptr==s.c_str())