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extern/stdcxx/4.2.1/include/loc/_messages.cc

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+/***************************************************************************
+ *
+ * _messages.cc - definition of std::messages members
+ *
+ * $Id: _messages.cc 637130 2008-03-14 15:16:33Z faridz $
+ *
+ ***************************************************************************
+ *
+ * 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;
+
+
+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;
+}
+
+
+}   // namespace std