Added string encoding method for html/xml/json stringsy

src/vscp/common/vscphelper.cpp

@@ -825,6 +825,34 @@ vscp_parseISOCombined(struct tm *ptm, std::string &dt)
   return true;
 }
 
+///////////////////////////////////////////////////////////////////////////////
+// vscp_safe_encode_str
+//
+//
+
+std::string 
+vscp_safe_encode_str(const std::string &str)
+{
+  std::string retstr = "";
+
+  for (auto it=str.cbegin(); it!=str.cend(); ++it) {
+    if ('\\' == *it) {
+      retstr += "\\";
+    }
+    else if ('\"' == *it) {
+      retstr += "\"";
+    }
+    else if (*it < 32) {
+      retstr += vscp_str_format("\\x%x", *it);
+    }
+    else {
+      retstr += *it;
+    }
+  }
+
+  return retstr;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // vscp_toXMLEscape
 //

src/vscp/common/vscphelper.h

@@ -525,6 +525,19 @@ vscp_str_after(const std::string &str, char c)
   return vscp_str_right(str, pos);
 }
 
+/*!
+  Saifly encode a standard string to be encoded in
+  HTML, XML or JSON
+  " (double quote)
+  \ (backslash)
+  all control characters like \n, \t
+
+  @param str Standard C++ string to encode
+  @return Encoded string.
+*/
+std::string 
+vscp_safe_encode_str(const std::string &str);
+
 /*!
     Check if a string is a number
     @param strNumber String to check