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xml_utils.cpp

// Copyright 2005-6 Ben Hutchings <ben@decadent.org.uk>.
// See the file "COPYING" for licence details.

#include <cassert>
#include <cstddef>

#include "xml_utils.hpp"

std::string xml_escape(const std::string & str)
{
    std::string result;
    std::size_t begin = 0;

    for (;;)
    {
      std::size_t end = str.find_first_of("\"&'<>", begin);
      result.append(str, begin, end - begin);
      if (end == std::string::npos)
          return result;

      const char * entity = NULL;
      switch (str[end])
      {
      case '"':  entity = "&quot;"; break;
      case '&':  entity = "&amp;";  break;
      case '\'': entity = "&apos;"; break;
      case '<':  entity = "&lt;";   break;
      case '>':  entity = "&gt;";   break;
      }
      assert(entity);
      result.append(entity);

      begin = end + 1;
    }
}

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