ae658d47a4
2000-08-22 Benjamin Kosnik <bkoz@purist.soma.redhat.com> * src/locale-inst.cc: Add codecvt<unicode_t, wchar_t, __enc_traits> instantiations for has_facet and use_facet. * testsuite/22_locale/codecvt_unicode_wchar_t.cc: New file, for testing two-byte unicode encodings converted to four-byte UCS4 encodings. * bits/codecvt.h (codecvt<__enc_traits>): Fix do_unshift. * testsuite/22_locale/codecvt_unicode_char.cc (test01): Add correct state/encoding information. * acinclude.m4 (GLIBCPP_CHECK_WCHAR_T_SUPPORT): Add wcsrtombs, mbsrtowcs checks as codecvt<wchar_t, char, mbstate_t> needs them now. Add checks for langinfo.h, nl_langinfo function call. * libio/iofwide.c (_IO_fwide): Simplify, as nl_langinfo is assumed. From-SVN: r35897
660 lines
19 KiB
C++
660 lines
19 KiB
C++
// Locale support (codecvt) -*- C++ -*-
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// Copyright (C) 2000 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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//
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// ISO C++ 14882: 22.2.1.5 Template class codecvt
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//
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// Warning: this file is not meant for user inclusion. Use <locale>.
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// Written by Benjamin Kosnik <bkoz@cygnus.com>
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#ifndef _CPP_BITS_CODECVT_H
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#define _CPP_BITS_CODECVT_H 1
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#ifdef _GLIBCPP_USE_WCHAR_T
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#include <iconv.h> // For iconv, iconv_t
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#include <langinfo.h>
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#endif
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namespace std
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{
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// XXX __enc_traits may need to move up the locale header heirarchy,
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// depending on if ctype ends up using it.
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#ifdef _GLIBCPP_USE_WCHAR_T
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// Extensions to use icov for dealing with character encodings,
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// including conversions and comparisons between various character
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// sets. This object encapsulates data that may need to be shared between
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// char_traits, codecvt and ctype.
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class __enc_traits
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{
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public:
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// Types:
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typedef iconv_t __conv_type;
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typedef mbstate_t __state_type;
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protected:
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// Data Members:
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// Max size of charset encoding name
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static const int __max_size = 32;
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// Name of internal character set encoding.
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char __intc_enc[__max_size];
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// Name of external character set encoding.
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char __extc_enc[__max_size];
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// Conversion descriptor between external encoding to internal encoding.
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__conv_type __in_desc;
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// Conversion descriptor between internal encoding to external encoding.
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__conv_type __out_desc;
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public:
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__enc_traits() : __in_desc(0), __out_desc(0)
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{
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// __intc_end = whatever we are using internally, which is
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// UCS4 (linux)
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// UCS2 == UNICODE (microsoft, java, aix, whatever...)
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// XXX Currently don't know how to get this data from target system...
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strcpy(__intc_enc, "UCS4");
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// __extc_end = external codeset in current locale
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strcpy(__extc_enc, nl_langinfo(CODESET));
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}
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__enc_traits(const char* __int, const char* __ext)
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: __in_desc(0), __out_desc(0)
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{
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strcpy(__intc_enc, __int);
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strcpy(__extc_enc, __ext);
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}
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~__enc_traits()
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{
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iconv_close(__in_desc);
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iconv_close(__out_desc);
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}
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// Initializes
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void
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_M_init()
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{
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__in_desc = iconv_open(__intc_enc, __extc_enc);
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__out_desc = iconv_open(__extc_enc, __intc_enc);
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if (__out_desc == (iconv_t) -1 || __in_desc == (iconv_t) -1)
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{
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// XXX Extended error checking.
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}
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}
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bool
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_M_good()
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{
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return __out_desc && __in_desc
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&& __out_desc != iconv_t(-1) && __in_desc != iconv_t(-1);
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}
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const __conv_type*
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_M_get_in_descriptor()
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{ return &__in_desc; }
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const __conv_type*
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_M_get_out_descriptor()
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{ return &__out_desc; }
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const char*
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_M_get_internal_enc()
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{ return __intc_enc; }
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const char*
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_M_get_external_enc()
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{ return __extc_enc; }
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protected:
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// 21.1.2 traits typedefs
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// p4
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// typedef STATE_T state_type
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// requires: state_type shall meet the requirements of
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// CopyConstructible types (20.1.3)
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// XXX because of this, these might actually need to be filled out.
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__enc_traits(const __enc_traits&);
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};
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#endif //_GLIBCPP_USE_WCHAR_T
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// 22.2.1.5 Template class codecvt
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class codecvt_base
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{
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public:
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enum result
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{
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ok,
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partial,
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error,
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noconv
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};
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};
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// Template class __codecvt_abstract_base
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// NB: An abstract base class that fills in the public inlines, so
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// that the specializations don't have to re-copy the public
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// interface.
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template<typename _InternT, typename _ExternT, typename _StateT>
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class __codecvt_abstract_base
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: public locale::facet, public codecvt_base
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{
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public:
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// Types:
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typedef codecvt_base::result result;
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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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// 22.2.1.5.1 codecvt members
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result
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out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{
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return this->do_out(__state, __from, __from_end, __from_next,
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__to, __to_end, __to_next);
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}
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result
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unshift(state_type& __state, extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{ return this->do_unshift(__state, __to,__to_end,__to_next); }
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result
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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_end,
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intern_type*& __to_next) const
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{
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return this->do_in(__state, __from, __from_end, __from_next,
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__to, __to_end, __to_next);
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}
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int
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encoding() const throw()
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{ return this->do_encoding(); }
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bool
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always_noconv() const throw()
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{ return this->do_always_noconv(); }
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int
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length(const state_type& __state, const extern_type* __from,
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const extern_type* __end, size_t __max) const
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{ return this->do_length(__state, __from, __end, __max); }
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int
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max_length() const throw()
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{ return this->do_max_length(); }
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protected:
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explicit
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__codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { }
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virtual
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~__codecvt_abstract_base() { }
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const = 0;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const = 0;
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virtual result
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do_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_end,
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intern_type*& __to_next) const = 0;
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virtual int
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do_encoding() const throw() = 0;
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virtual bool
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do_always_noconv() const throw() = 0;
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virtual int
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do_length(const state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const = 0;
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virtual int
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do_max_length() const throw() = 0;
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};
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// 22.2.1.5 Template class codecvt
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// NB: Generic, mostly useless implementation.
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template<typename _InternT, typename _ExternT, typename _StateT>
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class codecvt
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: public __codecvt_abstract_base<_InternT, _ExternT, _StateT>
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{
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public:
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// Types:
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typedef codecvt_base::result result;
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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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// Data Members:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0)
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: __codecvt_abstract_base<_InternT,_ExternT,_StateT> (__refs) { }
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protected:
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virtual
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~codecvt() { }
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};
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template<typename _InternT, typename _ExternT, typename _StateT>
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locale::id codecvt<_InternT, _ExternT, _StateT>::id;
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// partial specialization
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// This specialization takes advantage of iconv to provide code
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// conversions between a large number of character encodings.
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template<typename _InternT, typename _ExternT>
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class codecvt<_InternT, _ExternT, __enc_traits>
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: public __codecvt_abstract_base<_InternT, _ExternT, __enc_traits>
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{
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public:
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// Types:
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typedef codecvt_base::result result;
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typedef _InternT intern_type;
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typedef _ExternT extern_type;
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typedef __enc_traits state_type;
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typedef __enc_traits::__conv_type __conv_type;
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typedef __enc_traits __enc_type;
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// Data Members:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0)
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: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
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{ }
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explicit
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codecvt(__enc_type* __enc, size_t __refs = 0)
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: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
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{ }
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protected:
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virtual
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~codecvt() { }
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const;
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virtual result
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do_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_end,
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intern_type*& __to_next) const;
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virtual int
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do_encoding() const throw();
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virtual bool
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do_always_noconv() const throw();
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virtual int
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do_length(const state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const;
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virtual int
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do_max_length() const throw();
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};
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template<typename _InternT, typename _ExternT>
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locale::id
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codecvt<_InternT, _ExternT, __enc_traits>::id;
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template<typename _InternT, typename _ExternT>
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codecvt_base::result
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codecvt<_InternT, _ExternT, __enc_traits>::
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{
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result __ret = error;
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if (__state._M_good())
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{
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typedef state_type::__conv_type __conv_type;
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const __conv_type* __desc = __state._M_get_out_descriptor();
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const size_t __fmultiple = sizeof(intern_type) / sizeof(char);
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size_t __flen = __fmultiple * (__from_end - __from);
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const size_t __tmultiple = sizeof(extern_type) / sizeof(char);
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size_t __tlen = __tmultiple * (__to_end - __to);
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// Argument list for iconv specifies a byte sequence. Thus,
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// all to/from arrays must be brutally casted to char*.
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const char* __cfrom = reinterpret_cast<const char*>(__from);
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char* __cto = reinterpret_cast<char*>(__to);
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size_t __conv = iconv(*__desc, &__cfrom, &__flen, &__cto, &__tlen);
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if (__conv != size_t(-1))
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{
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__from_next = reinterpret_cast<const intern_type*>(__cfrom);
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__to_next = reinterpret_cast<extern_type*>(__cto);
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__ret = ok;
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}
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else
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{
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if (__flen < __from_end - __from)
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{
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__from_next = reinterpret_cast<const intern_type*>(__cfrom);
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__to_next = reinterpret_cast<extern_type*>(__cto);
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__ret = partial;
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}
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else
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__ret = error;
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}
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}
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return __ret;
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}
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template<typename _InternT, typename _ExternT>
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codecvt_base::result
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codecvt<_InternT, _ExternT, __enc_traits>::
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const
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{
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result __ret = error;
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if (__state._M_good())
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{
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typedef state_type::__conv_type __conv_type;
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const __conv_type* __desc = __state._M_get_in_descriptor();
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const size_t __tmultiple = sizeof(intern_type) / sizeof(char);
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size_t __tlen = __tmultiple * (__to_end - __to);
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// Argument list for iconv specifies a byte sequence. Thus,
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// all to/from arrays must be brutally casted to char*.
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char* __cto = reinterpret_cast<char*>(__to);
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size_t __conv = iconv(*__desc, NULL, NULL, &__cto, &__tlen);
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if (__conv != size_t(-1))
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{
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__to_next = reinterpret_cast<extern_type*>(__cto);
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if (__tlen == __tmultiple * (__to_end - __to))
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__ret = noconv;
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else if (__tlen == 0)
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__ret = ok;
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else
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__ret = partial;
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}
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else
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__ret = error;
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}
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return __ret;
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}
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template<typename _InternT, typename _ExternT>
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codecvt_base::result
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codecvt<_InternT, _ExternT, __enc_traits>::
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do_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_end,
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intern_type*& __to_next) const
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{
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result __ret = error;
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if (__state._M_good())
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{
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typedef state_type::__conv_type __conv_type;
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const __conv_type* __desc = __state._M_get_in_descriptor();
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const size_t __fmultiple = sizeof(extern_type) / sizeof(char);
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size_t __flen = __fmultiple * (__from_end - __from);
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const size_t __tmultiple = sizeof(intern_type) / sizeof(char);
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size_t __tlen = __tmultiple * (__to_end - __to);
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// Argument list for iconv specifies a byte sequence. Thus,
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// all to/from arrays must be brutally casted to char*.
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const char* __cfrom = reinterpret_cast<const char*>(__from);
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char* __cto = reinterpret_cast<char*>(__to);
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size_t __conv = iconv(*__desc, &__cfrom, &__flen, &__cto, &__tlen);
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if (__conv != size_t(-1))
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{
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__from_next = reinterpret_cast<const extern_type*>(__cfrom);
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__to_next = reinterpret_cast<intern_type*>(__cto);
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__ret = ok;
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}
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else
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{
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if (__flen < __from_end - __from)
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{
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__from_next = reinterpret_cast<const extern_type*>(__cfrom);
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__to_next = reinterpret_cast<intern_type*>(__cto);
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__ret = partial;
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}
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else
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__ret = error;
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}
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}
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return __ret;
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}
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template<typename _InternT, typename _ExternT>
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int
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codecvt<_InternT, _ExternT, __enc_traits>::
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do_encoding() const throw()
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{ return 0; }
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template<typename _InternT, typename _ExternT>
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bool
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codecvt<_InternT, _ExternT, __enc_traits>::
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do_always_noconv() const throw()
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{ return false; }
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template<typename _InternT, typename _ExternT>
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int
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codecvt<_InternT, _ExternT, __enc_traits>::
|
|
do_length(const state_type& __state, const extern_type* __from,
|
|
const extern_type* __end, size_t __max) const
|
|
{ return min(__max, static_cast<size_t>(__end - __from)); }
|
|
|
|
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
|
|
// 74. Garbled text for codecvt::do_max_length
|
|
template<typename _InternT, typename _ExternT>
|
|
int
|
|
codecvt<_InternT, _ExternT, __enc_traits>::
|
|
do_max_length() const throw()
|
|
{ return 1; }
|
|
#endif
|
|
|
|
// codecvt<char, char, mbstate_t> required specialization
|
|
template<>
|
|
class codecvt<char, char, mbstate_t>
|
|
: public __codecvt_abstract_base<char, char, mbstate_t>
|
|
{
|
|
public:
|
|
// Types:
|
|
typedef char intern_type;
|
|
typedef char extern_type;
|
|
typedef mbstate_t state_type;
|
|
|
|
// Data Members:
|
|
static locale::id id;
|
|
|
|
explicit
|
|
codecvt(size_t __refs = 0);
|
|
|
|
protected:
|
|
virtual
|
|
~codecvt();
|
|
|
|
virtual result
|
|
do_out(state_type& __state, const intern_type* __from,
|
|
const intern_type* __from_end, const intern_type*& __from_next,
|
|
extern_type* __to, extern_type* __to_end,
|
|
extern_type*& __to_next) const;
|
|
|
|
virtual result
|
|
do_unshift(state_type& __state, extern_type* __to,
|
|
extern_type* __to_end, extern_type*& __to_next) const;
|
|
|
|
virtual result
|
|
do_in(state_type& __state, const extern_type* __from,
|
|
const extern_type* __from_end, const extern_type*& __from_next,
|
|
intern_type* __to, intern_type* __to_end,
|
|
intern_type*& __to_next) const;
|
|
|
|
virtual int
|
|
do_encoding() const throw();
|
|
|
|
virtual bool
|
|
do_always_noconv() const throw();
|
|
|
|
virtual int
|
|
do_length(const state_type&, const extern_type* __from,
|
|
const extern_type* __end, size_t __max) const;
|
|
|
|
virtual int
|
|
do_max_length() const throw();
|
|
};
|
|
|
|
#ifdef _GLIBCPP_USE_WCHAR_T
|
|
// codecvt<wchar_t, char, mbstate_t> required specialization
|
|
template<>
|
|
class codecvt<wchar_t, char, mbstate_t>
|
|
: public __codecvt_abstract_base<wchar_t, char, mbstate_t>
|
|
{
|
|
public:
|
|
// Types:
|
|
typedef wchar_t intern_type;
|
|
typedef char extern_type;
|
|
typedef mbstate_t state_type;
|
|
|
|
// Data Members:
|
|
static locale::id id;
|
|
|
|
explicit
|
|
codecvt(size_t __refs = 0);
|
|
|
|
protected:
|
|
virtual
|
|
~codecvt();
|
|
|
|
virtual result
|
|
do_out(state_type& __state, const intern_type* __from,
|
|
const intern_type* __from_end, const intern_type*& __from_next,
|
|
extern_type* __to, extern_type* __to_end,
|
|
extern_type*& __to_next) const;
|
|
|
|
virtual result
|
|
do_unshift(state_type& __state,
|
|
extern_type* __to, extern_type* __to_end,
|
|
extern_type*& __to_next) const;
|
|
|
|
virtual result
|
|
do_in(state_type& __state,
|
|
const extern_type* __from, const extern_type* __from_end,
|
|
const extern_type*& __from_next,
|
|
intern_type* __to, intern_type* __to_end,
|
|
intern_type*& __to_next) const;
|
|
|
|
virtual
|
|
int do_encoding() const throw();
|
|
|
|
virtual
|
|
bool do_always_noconv() const throw();
|
|
|
|
virtual
|
|
int do_length(const state_type&, const extern_type* __from,
|
|
const extern_type* __end, size_t __max) const;
|
|
|
|
virtual int
|
|
do_max_length() const throw();
|
|
};
|
|
#endif //_GLIBCPP_USE_WCHAR_T
|
|
|
|
// 22.2.1.6 Template class codecvt_byname
|
|
template<typename _InternT, typename _ExternT, typename _StateT>
|
|
class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
|
|
{
|
|
public:
|
|
explicit
|
|
codecvt_byname(const char*, size_t __refs = 0)
|
|
: codecvt<_InternT,_ExternT,_StateT> (__refs) { }
|
|
protected:
|
|
virtual
|
|
~codecvt_byname() { }
|
|
};
|
|
|
|
template<>
|
|
class codecvt_byname<char, char, mbstate_t>
|
|
: public codecvt<char, char, mbstate_t>
|
|
{
|
|
public:
|
|
explicit
|
|
codecvt_byname(const char*, size_t __refs = 0);
|
|
|
|
protected:
|
|
virtual
|
|
~codecvt_byname();
|
|
};
|
|
|
|
#ifdef _GLIBCPP_USE_WCHAR_T
|
|
template<>
|
|
class codecvt_byname<wchar_t, char, mbstate_t>
|
|
: public codecvt<wchar_t, char, mbstate_t>
|
|
{
|
|
public:
|
|
explicit
|
|
codecvt_byname(const char*, size_t __refs = 0);
|
|
|
|
protected:
|
|
virtual
|
|
~codecvt_byname();
|
|
};
|
|
#endif
|
|
|
|
} // namespace std
|
|
|
|
#endif // _CPP_BITS_CODECVT_H
|
|
|
|
// Local Variables:
|
|
// mode:c++
|
|
// End:
|
|
|