include/loc/_messages.cc

/***************************************************************************
 *
 * _messages.cc - definition of std::messages members
 *
 * $Id$
 *
 ***************************************************************************
 *
 * Licensed to the Apache Software  Foundation (ASF) under one or more
 * contributor  license agreements.  See  the NOTICE  file distributed
 * with  this  work  for  additional information  regarding  copyright
 * ownership.   The ASF  licenses this  file to  you under  the Apache
 * License, Version  2.0 (the  "License"); you may  not use  this file
 * except in  compliance with the License.   You may obtain  a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the  License is distributed on an  "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
 * implied.   See  the License  for  the  specific language  governing
 * permissions and limitations under the License.
 *
 * Copyright 1994-2008 Rogue Wave Software, Inc.
 * 
 **************************************************************************/

#include <loc/_ctype.h>


_RWSTD_NAMESPACE (std) { 


template <class _CharT>
_RW::__rw_facet_id messages<_CharT>::id;


// outlined to avoid generating a vtable in each translation unit
// that uses the class
template <class _CharT>
/* virtual */ messages<_CharT>::
~messages ()
{
    // no-op
}


template <class _CharT>
messages_base::catalog
messages<_CharT>::
do_open (const string& __fun, const locale&__loc) const
{
    return _RW::__rw_cat_open (__fun, __loc);
}


template <class _CharT>
void
messages<_CharT>::
do_close (messages_base::catalog __cat) const
{
    _RW::__rw_cat_close (__cat);
}


template <class _CharT>
typename messages<_CharT>::string_type
messages<_CharT>::do_get (messages_base::catalog __cat,
                          int                    __set,
                          int                    __msgid,
                          const string_type     &__dfault) const
{
    const char* const __text = _RW::__rw_get_message (__cat, __set, __msgid);
 
    if (__text) {
        typedef _STD::codecvt<_CharT, char, _RWSTD_MBSTATE_T>
            _CodeCvt;

        typedef typename _CodeCvt::state_type state_type;

        const _CodeCvt& __codecvt =
            _RWSTD_USE_FACET (_CodeCvt, _RW::__rw_get_locale (__cat));

        if (sizeof (_CharT) == sizeof (char) && __codecvt.always_noconv ()) {
            // lwg issue 19: always_noconv() is only allowed to return
            // true if extern_type and intern_type are one and the same
            return _RWSTD_REINTERPRET_CAST (const _CharT*, __text);
        }

        typedef char_traits<char> _CharTraits;
        typedef _RWSTD_SIZE_T     _SizeT;

        const _SizeT      __src_len = _CharTraits::length (__text);
        const char* const __src_first = __text;
        const char* const __src_last  = __text + __src_len;
        const char*       __src_next  = __src_first;

        // allocate a [wide] string large enough to hold at least
        // as many internal characters as there are bytes in the
        // multibyte characater message
        string_type __result_str ((const _CharT*)0, __src_len);

        _CharT* const __dst_first = &__result_str [0];
        _CharT* const __dst_last  = __dst_first + __src_len;
        _CharT*       __dst_next  = __dst_first;

        state_type __state = state_type ();

        // avoid using const codecvt_base::result here
        // to prevent HP aCC 3.27 errors
        const int __res =
            __codecvt.in (__state, __src_first, __src_last, __src_next,
                          __dst_first, __dst_last, __dst_next);

        switch (__res) {
        case codecvt_base::ok:
            // shrink the converted string accordingly
            _RWSTD_ASSERT (__dst_first <= __dst_next);

            __result_str.resize (_SizeT (__dst_next - __dst_first));
            return __result_str;

        case codecvt_base::noconv:
            if (sizeof (_CharT) == sizeof (char)) {
                // lwg issue 19: in() is only allowed to return noconv
                // if extern_type and intern_type are one and the same
                return _RWSTD_REINTERPRET_CAST (const _CharT*, __text);
            }
            else {
                // should not happen - bad codecvt implementation

                typedef ctype<_CharT> _Ctype;

                const _Ctype& __ctp =
                    _RWSTD_USE_FACET (_Ctype, _RW::__rw_get_locale (__cat));

                for (_SizeT __i = 0; __i != __src_len; ++__i)
                    __dst_first [__i] = __ctp.widen (__text [__i]);

                return __result_str;
            }

        case codecvt_base::partial:
            // should not happen (bad catalog?)
        default:
            break;
        }
    }
    return __dfault;
}


// outlined to avoid generating a vtable in each translation unit
// that uses the class
template <class _CharT>
/* virtual */ messages_byname<_CharT>::
~messages_byname ()
{
    // no-op
}


}   // namespace std