environment_block.hpp

新版本TR1的stl

        WINSTL_ASSERT(cch >= 3);
        WINSTL_ASSERT(NULL != traits_type::find(variable, cch, '='));

        size_type   oldSize = m_buffer.size();

        WINSTL_ASSERT(m_buffer.size() > 1);
        WINSTL_ASSERT('\0' == m_buffer[m_buffer.size() - 1]);
        WINSTL_ASSERT('\0' == m_buffer[m_buffer.size() - 2]);

        if(!m_buffer.resize(oldSize + cch + 1))
        {
            return false;
        }
        else
        {
            traits_type::copy(&m_buffer[oldSize - 1], variable, cch);
            m_buffer[m_buffer.size() - 2] = '\0';
            m_buffer[m_buffer.size() - 1] = '\0';

            WINSTL_ASSERT(m_buffer.size() > 1);
            WINSTL_ASSERT('\0' == m_buffer[m_buffer.size() - 1]);
            WINSTL_ASSERT('\0' == m_buffer[m_buffer.size() - 2]);

            return true;
        }
    }
    /// \brief Append a NAME= environment variable
    ///
    /// \param variable The variable
    ///
    /// \return An indication of success. This will always return true when
    /// compiling with exception support.
    ///
    /// \note The variable must contain an equal sign ('=')
    ///
    /// \exception std::bad_alloc When compiling with exception support, this will throw
    /// std::bad_alloc if memory cannot be acquired. When compiling absent
    /// exception support, failure to acquire memory will cause the method
    /// to return false.
    template <ss_typename_param_k S>
    ws_bool_t push_back(S const& variable)
    {
        return push_back(stlsoft_ns_qual(c_str_data)(variable), stlsoft_ns_qual(c_str_len)(variable));
    }
    /// \brief Append a full NAME=VALUE environment pair
    ///
    /// \param name The variable name
    /// \param cchName The length of the variable name
    /// \param value The variable value
    /// \param cchValue The length of the variable value
    ///
    /// \return An indication of success. This will always return true when
    /// compiling with exception support.
    ///
    /// \exception std::bad_alloc When compiling with exception support, this will throw
    /// std::bad_alloc if memory cannot be acquired. When compiling absent
    /// exception support, failure to acquire memory will cause the method
    /// to return false.
    ws_bool_t push_back(char_type const* name, ws_size_t cchName, char_type const* value, ws_size_t cchValue)
    {
        WINSTL_ASSERT(NULL != name);
        WINSTL_ASSERT(NULL != value);
        WINSTL_ASSERT(cchName > 1);
//        WINSTL_ASSERT(cchValue > 1);

        size_type   oldSize = m_buffer.size();

        WINSTL_ASSERT(m_buffer.size() > 1);
        WINSTL_ASSERT('\0' == m_buffer[m_buffer.size() - 1]);
        WINSTL_ASSERT('\0' == m_buffer[m_buffer.size() - 2]);

        if(!m_buffer.resize(oldSize + cchName + 1 + cchValue + 1))
        {
            return false;
        }
        else
        {
            traits_type::copy(&m_buffer[oldSize - 2], name, cchName);
            m_buffer[oldSize - 2 + cchName] = '=';
            traits_type::copy(&m_buffer[oldSize - 2 + cchName + 1], value, cchValue);
            m_buffer[oldSize - 2 + cchName + 1 + cchValue] = '\0';
            m_buffer[m_buffer.size() - 2] = '\0';
            m_buffer[m_buffer.size() - 1] = '\0';

            WINSTL_ASSERT(m_buffer.size() > 1);
            WINSTL_ASSERT('\0' == m_buffer[m_buffer.size() - 1]);
            WINSTL_ASSERT('\0' == m_buffer[m_buffer.size() - 2]);

            return true;
        }
    }
    /// \brief Append a full NAME=VALUE environment pair
    ///
    /// \param name The variable name
    /// \param value The variable value
    ///
    /// \return An indication of success. This will always return true when
    /// compiling with exception support.
    ///
    /// \exception std::bad_alloc When compiling with exception support, this will throw
    /// std::bad_alloc if memory cannot be acquired. When compiling absent
    /// exception support, failure to acquire memory will cause the method
    /// to return false.
    template<   ss_typename_param_k S1
            ,   ss_typename_param_k S2
            >
    ws_bool_t push_back(S1 const& name, S2 const& value)
    {
        return push_back(stlsoft_ns_qual(c_str_data)(name), stlsoft_ns_qual(c_str_len)(name), stlsoft_ns_qual(c_str_data)(value), stlsoft_ns_qual(c_str_len)(value));
    }

    /// Empties the block of all variables
    void clear()
    {
        m_buffer.resize(2);

        m_buffer[0] = '\0';
        m_buffer[1] = '\0';
    }

    /// Swaps the contents of the two instances
    void swap(class_type& rhs) stlsoft_throw_0()
    {
        m_buffer.swap(rhs.m_buffer);
    }
/// @}

/// \name Accessors
/// @{
public:
    /// Returns a pointer to the block contents
    void const  *base() const
    {
        return m_buffer.data();
    }
    /// The number of characters in the block
    size_type size() const
    {
        return m_buffer.size();
    }
    /// The number of characters in the block
    ///
    /// \note This method is a synonym for size()
    size_type length() const
    {
        return size();
    }
/// @}

/** \brief Members
 *
 * \ingroup group__library__system
 */
private:
    typedef stlsoft_ns_qual(auto_buffer_old)<   char_type
                                            ,   allocator_type
                                            ,   1024
                                            >       buffer_type_;

    buffer_type_    m_buffer;
};

/* /////////////////////////////////////////////////////////////////////////
 * Typedefs for commonly encountered types
 */

#ifdef STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_CLASS_ARGUMENT_SUPPORT

 /// Specialisation of the basic_path template for the ANSI character type \c char
typedef basic_environment_block<ws_char_a_t>    environment_block_a;
/** \brief Specialisation of the basic_environment_block template for the Unicode character type \c wchar_t
 *
 * \ingroup group__library__system
 */
typedef basic_environment_block<ws_char_w_t>    environment_block_w;
/** \brief Specialisation of the basic_environment_block template for the Win32 character type \c TCHAR
 *
 * \ingroup group__library__system
 */
typedef basic_environment_block<TCHAR>          environment_block;

#endif /* STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_CLASS_ARGUMENT_SUPPORT */

/* /////////////////////////////////////////////////////////////////////////
 * Unit-testing
 */

#ifdef STLSOFT_UNITTEST
# include "./unittest/environment_block_unittest_.h"
#endif /* STLSOFT_UNITTEST */

/* /////////////////////////////////////////////////////////////////////////
 * Implementation
 */

/* ////////////////////////////////////////////////////////////////////// */

#ifndef _WINSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
} // namespace winstl
# else
} // namespace winstl_project
} // namespace stlsoft
# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_WINSTL_NO_NAMESPACE */

/* ////////////////////////////////////////////////////////////////////// */

#endif /* WINSTL_INCL_WINSTL_SYSTEM_HPP_ENVIRONMENT_BLOCK */

/* ////////////////////////////////////////////////////////////////////// */