458 lines
13 KiB
C++
458 lines
13 KiB
C++
/***************************************************************************
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*
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* _codecvt.h - Definitions of the code conversion facets
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*
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* This is an internal header file used to implement the C++ Standard
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* Library. It should never be #included directly by a program.
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*
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* $Id: _codecvt.h 597181 2007-11-21 18:59:19Z faridz $
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*
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***************************************************************************
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*
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* Copyright 1994-2007 Rogue Wave Software, Inc.
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*
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**************************************************************************/
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#ifndef _RWSTD_LOC_CODECVT_H_INCLUDED
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#define _RWSTD_LOC_CODECVT_H_INCLUDED
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#include <rw/_defs.h>
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#include <loc/_facet.h>
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#include <rw/_mbstate.h> // for _RWSTD_MBSTATE_T
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_RWSTD_NAMESPACE (__rw) {
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struct __rw_ctype_t;
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} // namespace __rw
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_RWSTD_NAMESPACE (std) {
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// 22.2.1.5 - Template class codecvt
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struct codecvt_base
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{
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enum result { ok, partial, error, noconv };
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};
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_EXPORT
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template <class _InternT, class _ExternT, class _StateT>
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class codecvt;
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#ifndef _RWSTD_NO_EXT_CODECVT_PRIMARY
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_EXPORT
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template <class _InternT, class _ExternT, class _StateT>
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class codecvt: public _RW::__rw_facet,
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public codecvt_base
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{
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public:
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typedef _InternT intern_type;
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typedef _ExternT extern_type;
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typedef _StateT state_type;
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protected:
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// extension: where reasonable, the default behavior of the primary
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// template is the same as that of codecvt<char, char, mbstate_t> if
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// sizeof (intern_type) == sizeof (extern_type) to allow iostream
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// instantiations on signed char or unsigned char to have somewhat
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// meaningful behavior
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virtual result
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do_out (state_type&,
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const intern_type*, const intern_type*, const intern_type*&,
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extern_type*, extern_type*, extern_type*&) const {
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return sizeof (intern_type) == sizeof (extern_type) ? noconv : error;
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}
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virtual result
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do_in (state_type&,
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const extern_type*, const extern_type*, const extern_type*&,
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intern_type*, intern_type*, intern_type*&) const {
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return sizeof (intern_type) == sizeof (extern_type) ? noconv : error;
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}
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virtual result
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do_unshift (state_type&, extern_type*, extern_type*, extern_type*&) const {
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return sizeof (intern_type) == sizeof (extern_type) ? noconv : error;
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}
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virtual int do_encoding () const _THROWS (()) {
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return -1; // unknown, possibly state dependent
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}
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virtual bool do_always_noconv () const _THROWS (()) {
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return sizeof (intern_type) == sizeof (extern_type);
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}
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virtual int do_max_length () const _THROWS (()) {
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return _RWSTD_INT_MAX;
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}
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virtual int
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do_length (state_type&,
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const extern_type*, const extern_type*, _RWSTD_SIZE_T) const {
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return _RWSTD_INT_MAX;
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}
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public:
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_EXPLICIT codecvt (_RWSTD_SIZE_T __ref = 0): _RW::__rw_facet (__ref) { }
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// 22,2,1,5,1, p1
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result out (state_type& __state,
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const intern_type* __from, const intern_type* __from_end,
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const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_limit,
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extern_type*& __to_next) const {
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return do_out(__state,__from,__from_end,__from_next,
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__to,__to_limit,__to_next);
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}
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// 22,2,1,5,1, p2
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result unshift (state_type& __state, extern_type* __to,
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extern_type* __to_limit, extern_type*& __to_next) const {
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return do_unshift (__state,__to,__to_limit,__to_next);
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}
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// 22,2,1,5,1, p3
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result in (state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_limit,
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intern_type*& __to_next) const {
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return do_in (__state,__from,__from_end,__from_next,
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__to,__to_limit,__to_next);
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}
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// 22,2,1,5,1, p5
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bool always_noconv () const _THROWS (()) {
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return do_always_noconv();
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}
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// 22,2,1,5,1, p4
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int encoding () const _THROWS (()) {
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return do_encoding();
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}
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// 22,2,1,5,1, p6, lwg issue 75
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int length (state_type& __state, const extern_type* __from,
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const extern_type* __end, _RWSTD_SIZE_T __maxlen) const {
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return do_length (__state, __from, __end, __maxlen);
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}
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// 22,2,1,5,1, p7
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int max_length() const _THROWS (()) {
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return do_max_length();
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}
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static _RW::__rw_facet_id id;
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};
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#endif // _RWSTD_NO_EXT_CODECVT_PRIMARY
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// 22.2.1.5, p3 - performs no conversion
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_RWSTD_SPECIALIZED_CLASS
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class _RWSTD_EXPORT codecvt<char, char, _RWSTD_MBSTATE_T>
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: public _RW::__rw_facet,
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public codecvt_base
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{
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public:
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typedef char extern_type;
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typedef char intern_type;
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typedef _RWSTD_MBSTATE_T state_type;
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_EXPLICIT codecvt (_RWSTD_SIZE_T = 0);
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virtual ~codecvt ();
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result out (state_type &__state,
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const intern_type *__from, const intern_type* __from_end,
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const intern_type *&__from_next,
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extern_type* __to, extern_type* __to_limit,
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extern_type *&__to_next) const {
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return do_out (__state, __from, __from_end, __from_next,
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__to, __to_limit, __to_next);
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}
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result unshift (state_type &__state,
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extern_type *__to, extern_type *__to_limit,
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extern_type*& __to_next) const {
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return do_unshift (__state, __to, __to_limit, __to_next);
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}
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result in (state_type &__state,
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const extern_type *__from, const extern_type *__from_end,
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const extern_type *&__from_next,
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intern_type *__to, intern_type *__to_limit,
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intern_type *&__to_next) const {
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return do_in (__state, __from, __from_end, __from_next,
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__to, __to_limit, __to_next);
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}
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int encoding () const _THROWS (()) {
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return do_encoding ();
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}
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bool always_noconv () const _THROWS (());
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// signature follows lwg issue 75
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int length (state_type &__state, const extern_type *__from,
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const extern_type *__end, _RWSTD_SIZE_T __maxlen) const {
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return do_length (__state, __from, __end, __maxlen);
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}
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int max_length () const _THROWS (()) {
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return do_max_length ();
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}
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static _RW::__rw_facet_id id;
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protected:
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virtual result
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do_out (state_type&,
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const intern_type*, const intern_type*, const intern_type*&,
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extern_type*, extern_type*, extern_type*&) const;
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virtual result
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do_in (state_type&,
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const extern_type*, const extern_type*, const extern_type*&,
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intern_type*, intern_type*, intern_type*&) const;
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// 22.2.1.5.2, p5 - stores no characters
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virtual result
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do_unshift (state_type&,
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extern_type*, extern_type*, extern_type*&) const;
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virtual int do_encoding () const _THROWS (());
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virtual bool do_always_noconv () const _THROWS (());
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// signature follows lwg issue 75
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virtual int
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do_length (state_type&,
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const extern_type*, const extern_type*, _RWSTD_SIZE_T) const;
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virtual int do_max_length () const _THROWS (());
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private:
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int _C_always_noconv; // cached value
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};
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inline bool
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codecvt<char, char, _RWSTD_MBSTATE_T>::
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always_noconv () const _THROWS (())
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{
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// optimize away repeated calls to the virtual function
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if (_C_always_noconv < 0) {
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// typedef works around an HP aCC x.38 bug (PR #25832)
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typedef codecvt<char, char, _RWSTD_MBSTATE_T> _CodeCvt;
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_CodeCvt *__self = _RWSTD_CONST_CAST (_CodeCvt*, this);
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__self->_C_always_noconv = do_always_noconv ();
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}
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return 1 == _C_always_noconv;
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}
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#ifndef _RWSTD_NO_WCHAR_T
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// 22.2.1.5, p3 - converts between wide and narrow characters
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// of the native character set (i.e., widens and narrows)
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_RWSTD_SPECIALIZED_CLASS
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class _RWSTD_EXPORT codecvt<wchar_t, char, _RWSTD_MBSTATE_T>
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: public _RW::__rw_facet,
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public codecvt_base
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{
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public:
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typedef wchar_t intern_type;
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typedef char extern_type;
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typedef _RWSTD_MBSTATE_T state_type;
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protected:
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virtual result
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do_out (state_type&, const intern_type*, const intern_type*,
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const intern_type*&,
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extern_type*, extern_type*, extern_type*&) const;
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virtual result
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do_in (state_type&,
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const extern_type*, const extern_type*, const extern_type*&,
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intern_type*, intern_type*, intern_type*&) const;
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// 22.2.1.5.2, p5 - stores no characters
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virtual result
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do_unshift (state_type&, extern_type*, extern_type*, extern_type*&) const;
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virtual bool do_always_noconv () const _THROWS (());
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virtual int do_encoding () const _THROWS (());
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// signature follows lwg issue 75
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virtual int
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do_length (state_type&,
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const extern_type*, const extern_type*, _RWSTD_SIZE_T) const;
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virtual int do_max_length () const _THROWS (());
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public:
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_EXPLICIT codecvt (_RWSTD_SIZE_T = 0);
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result out (state_type& __state,
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const intern_type *__from, const intern_type *__from_end,
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const intern_type *&__from_next,
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extern_type *__to, extern_type* __to_limit,
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extern_type *& __to_next) const {
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return do_out (__state, __from, __from_end, __from_next, __to,
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__to_limit, __to_next);
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}
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result unshift (state_type &__state,
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extern_type *__to, extern_type *__to_limit,
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extern_type *&__to_next) const {
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return do_unshift (__state, __to, __to_limit, __to_next);
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}
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result in (state_type& __state,
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const extern_type *__from, const extern_type *__from_end,
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const extern_type *&__from_next,
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intern_type *__to, intern_type *__to_limit,
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intern_type *&__to_next) const {
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return do_in (__state, __from, __from_end, __from_next,
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__to, __to_limit, __to_next);
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}
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int encoding () const _THROWS (()) {
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return do_encoding();
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}
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bool always_noconv () const _THROWS (()) {
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return do_always_noconv ();
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}
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// signature follows lwg issue 75
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int length (state_type &__state,
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const extern_type *__from, const extern_type *__end,
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_RWSTD_SIZE_T __maxlen) const {
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return do_length (__state, __from, __end, __maxlen);
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}
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int max_length () const _THROWS (()) {
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return do_max_length ();
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}
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static _RW::__rw_facet_id id;
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};
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#endif // _RWSTD_NO_WCHAR_T
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// 22.2.1.6
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template <class _InternT, class _ExternT, class _StateT>
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class codecvt_byname: public codecvt<_InternT, _ExternT, _StateT>
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{
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char _C_namebuf [32];
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public:
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typedef _InternT intern_type;
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typedef _ExternT extern_type;
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typedef _StateT state_type;
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_EXPLICIT codecvt_byname (const char *__name, _RWSTD_SIZE_T __ref = 0)
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: codecvt <_InternT, _ExternT, _StateT> (__ref) {
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this->_C_set_name (__name, _C_namebuf, sizeof _C_namebuf);
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}
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};
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#ifndef _RWSTD_NO_WCHAR_T
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_RWSTD_SPECIALIZED_CLASS
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class _RWSTD_EXPORT codecvt_byname<wchar_t, char, _RWSTD_MBSTATE_T>
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: public codecvt<wchar_t, char, _RWSTD_MBSTATE_T>
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{
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char _C_namebuf [32];
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unsigned _C_flags;
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public:
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_EXPLICIT codecvt_byname (const char*, _RWSTD_SIZE_T = 0);
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protected:
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virtual codecvt_base::result
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do_out (state_type&,
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const intern_type*, const intern_type*, const intern_type*&,
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extern_type*, extern_type*, extern_type*&) const;
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virtual codecvt_base::result
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do_in (state_type&,
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const extern_type*, const extern_type*, const extern_type*&,
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intern_type*, intern_type*, intern_type*&) const;
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virtual codecvt_base::result
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do_unshift (state_type&,
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extern_type*, extern_type*, extern_type*&) const;
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virtual int do_encoding () const _THROWS (());
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// signature follows lwg issue 75
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virtual int
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do_length (state_type&, const extern_type*, const extern_type*,
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_RWSTD_SIZE_T) const;
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virtual int do_max_length () const _THROWS (());
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};
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#endif // _RWSTD_NO_WCHAR_T
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} // namespace std
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#if _RWSTD_DEFINE_TEMPLATE (_CODECVT)
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# include <loc/_codecvt.cc>
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#endif // _RWSTD_DEFINE_TEMPLATE (_CODECVT)
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#endif // _RWSTD_LOC_CODECVT_H_INCLUDED
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