Question

I search the web alot and didn’t find c++ function that replace xml Special Character with their escape sequence?
Is there something like this?

I know about the following:

Special Character   Escape Sequence Purpose  
&                   &           Ampersand sign 
'                   '          Single quote 
"                   "          Double quote
>                   >            Greater than 
<                   &lt;            Less than

is there more? what about writing hexadecimal value like 0×00,
Is this also a problem?

Answer 1

As has been stated, it would be possible to write your own. For example:

#include <iostream>
#include <string>
#include <map>

int main()
{
    std::string xml("a < > & ' \" string");
    std::cout << xml << "\n";

    // Characters to be transformed.
    //
    std::map<char, std::string> transformations;
    transformations['&']  = std::string("&amp;");
    transformations['\''] = std::string("&apos;");
    transformations['"']  = std::string("&quot;");
    transformations['>']  = std::string("&gt;");
    transformations['<']  = std::string("&lt;");

    // Build list of characters to be searched for.
    //
    std::string reserved_chars;
    for (auto ti = transformations.begin(); ti != transformations.end(); ti++)
    {
        reserved_chars += ti->first;
    }

    size_t pos = 0;
    while (std::string::npos != (pos = xml.find_first_of(reserved_chars, pos)))
    {
        xml.replace(pos, 1, transformations[xml[pos]]);
        pos++;
    }

    std::cout << xml << "\n";

    return 0;
}

Output:

a < > & ' " string
a &lt; &gt; &amp; &apos; &quot; string

Add an entry into transformations to introduce new transformations.