--- /dev/null
+// Locale support (codecvt) -*- C++ -*-
+
+// Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+// 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/codecvt.h
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+//
+// ISO C++ 14882: 22.2.1.5 Template class codecvt
+//
+
+// Written by Benjamin Kosnik <bkoz@redhat.com>
+
+#ifndef _CODECVT_H
+#define _CODECVT_H 1
+
+#pragma GCC system_header
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+ /// Empty base class for codecvt facet [22.2.1.5].
+ class codecvt_base
+ {
+ public:
+ enum result
+ {
+ ok,
+ partial,
+ error,
+ noconv
+ };
+ };
+
+ /**
+ * @brief Common base for codecvt functions.
+ *
+ * This template class provides implementations of the public functions
+ * that forward to the protected virtual functions.
+ *
+ * This template also provides abstract stubs for the protected virtual
+ * functions.
+ */
+ template<typename _InternT, typename _ExternT, typename _StateT>
+ class __codecvt_abstract_base
+ : public locale::facet, public codecvt_base
+ {
+ public:
+ // Types:
+ typedef codecvt_base::result result;
+ typedef _InternT intern_type;
+ typedef _ExternT extern_type;
+ typedef _StateT state_type;
+
+ // 22.2.1.5.1 codecvt members
+ /**
+ * @brief Convert from internal to external character set.
+ *
+ * Converts input string of intern_type to output string of
+ * extern_type. This is analogous to wcsrtombs. It does this by
+ * calling codecvt::do_out.
+ *
+ * The source and destination character sets are determined by the
+ * facet's locale, internal and external types.
+ *
+ * The characters in [from,from_end) are converted and written to
+ * [to,to_end). from_next and to_next are set to point to the
+ * character following the last successfully converted character,
+ * respectively. If the result needed no conversion, from_next and
+ * to_next are not affected.
+ *
+ * The @a state argument should be initialized if the input is at the
+ * beginning and carried from a previous call if continuing
+ * conversion. There are no guarantees about how @a state is used.
+ *
+ * The result returned is a member of codecvt_base::result. If
+ * all the input is converted, returns codecvt_base::ok. If no
+ * conversion is necessary, returns codecvt_base::noconv. If
+ * the input ends early or there is insufficient space in the
+ * output, returns codecvt_base::partial. Otherwise the
+ * conversion failed and codecvt_base::error is returned.
+ *
+ * @param state Persistent conversion state data.
+ * @param from Start of input.
+ * @param from_end End of input.
+ * @param from_next Returns start of unconverted data.
+ * @param to Start of output buffer.
+ * @param to_end End of output buffer.
+ * @param to_next Returns start of unused output area.
+ * @return codecvt_base::result.
+ */
+ result
+ 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
+ {
+ return this->do_out(__state, __from, __from_end, __from_next,
+ __to, __to_end, __to_next);
+ }
+
+ /**
+ * @brief Reset conversion state.
+ *
+ * Writes characters to output that would restore @a state to initial
+ * conditions. The idea is that if a partial conversion occurs, then
+ * the converting the characters written by this function would leave
+ * the state in initial conditions, rather than partial conversion
+ * state. It does this by calling codecvt::do_unshift().
+ *
+ * For example, if 4 external characters always converted to 1 internal
+ * character, and input to in() had 6 external characters with state
+ * saved, this function would write two characters to the output and
+ * set the state to initialized conditions.
+ *
+ * The source and destination character sets are determined by the
+ * facet's locale, internal and external types.
+ *
+ * The result returned is a member of codecvt_base::result. If the
+ * state could be reset and data written, returns codecvt_base::ok. If
+ * no conversion is necessary, returns codecvt_base::noconv. If the
+ * output has insufficient space, returns codecvt_base::partial.
+ * Otherwise the reset failed and codecvt_base::error is returned.
+ *
+ * @param state Persistent conversion state data.
+ * @param to Start of output buffer.
+ * @param to_end End of output buffer.
+ * @param to_next Returns start of unused output area.
+ * @return codecvt_base::result.
+ */
+ result
+ unshift(state_type& __state, extern_type* __to, extern_type* __to_end,
+ extern_type*& __to_next) const
+ { return this->do_unshift(__state, __to,__to_end,__to_next); }
+
+ /**
+ * @brief Convert from external to internal character set.
+ *
+ * Converts input string of extern_type to output string of
+ * intern_type. This is analogous to mbsrtowcs. It does this by
+ * calling codecvt::do_in.
+ *
+ * The source and destination character sets are determined by the
+ * facet's locale, internal and external types.
+ *
+ * The characters in [from,from_end) are converted and written to
+ * [to,to_end). from_next and to_next are set to point to the
+ * character following the last successfully converted character,
+ * respectively. If the result needed no conversion, from_next and
+ * to_next are not affected.
+ *
+ * The @a state argument should be initialized if the input is at the
+ * beginning and carried from a previous call if continuing
+ * conversion. There are no guarantees about how @a state is used.
+ *
+ * The result returned is a member of codecvt_base::result. If
+ * all the input is converted, returns codecvt_base::ok. If no
+ * conversion is necessary, returns codecvt_base::noconv. If
+ * the input ends early or there is insufficient space in the
+ * output, returns codecvt_base::partial. Otherwise the
+ * conversion failed and codecvt_base::error is returned.
+ *
+ * @param state Persistent conversion state data.
+ * @param from Start of input.
+ * @param from_end End of input.
+ * @param from_next Returns start of unconverted data.
+ * @param to Start of output buffer.
+ * @param to_end End of output buffer.
+ * @param to_next Returns start of unused output area.
+ * @return codecvt_base::result.
+ */
+ result
+ 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
+ {
+ return this->do_in(__state, __from, __from_end, __from_next,
+ __to, __to_end, __to_next);
+ }
+
+ int
+ encoding() const throw()
+ { return this->do_encoding(); }
+
+ bool
+ always_noconv() const throw()
+ { return this->do_always_noconv(); }
+
+ int
+ length(state_type& __state, const extern_type* __from,
+ const extern_type* __end, size_t __max) const
+ { return this->do_length(__state, __from, __end, __max); }
+
+ int
+ max_length() const throw()
+ { return this->do_max_length(); }
+
+ protected:
+ explicit
+ __codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { }
+
+ virtual
+ ~__codecvt_abstract_base() { }
+
+ /**
+ * @brief Convert from internal to external character set.
+ *
+ * Converts input string of intern_type to output string of
+ * extern_type. This function is a hook for derived classes to change
+ * the value returned. @see out for more information.
+ */
+ 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 = 0;
+
+ virtual result
+ do_unshift(state_type& __state, extern_type* __to,
+ extern_type* __to_end, extern_type*& __to_next) const = 0;
+
+ 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 = 0;
+
+ virtual int
+ do_encoding() const throw() = 0;
+
+ virtual bool
+ do_always_noconv() const throw() = 0;
+
+ virtual int
+ do_length(state_type&, const extern_type* __from,
+ const extern_type* __end, size_t __max) const = 0;
+
+ virtual int
+ do_max_length() const throw() = 0;
+ };
+
+ /// @brief class codecvt [22.2.1.5].
+ /// NB: Generic, mostly useless implementation.
+ template<typename _InternT, typename _ExternT, typename _StateT>
+ class codecvt
+ : public __codecvt_abstract_base<_InternT, _ExternT, _StateT>
+ {
+ public:
+ // Types:
+ typedef codecvt_base::result result;
+ typedef _InternT intern_type;
+ typedef _ExternT extern_type;
+ typedef _StateT state_type;
+
+ protected:
+ __c_locale _M_c_locale_codecvt;
+
+ public:
+ static locale::id id;
+
+ explicit
+ codecvt(size_t __refs = 0)
+ : __codecvt_abstract_base<_InternT, _ExternT, _StateT> (__refs) { }
+
+ explicit
+ codecvt(__c_locale __cloc, 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(state_type&, const extern_type* __from,
+ const extern_type* __end, size_t __max) const;
+
+ virtual int
+ do_max_length() const throw();
+ };
+
+ template<typename _InternT, typename _ExternT, typename _StateT>
+ locale::id codecvt<_InternT, _ExternT, _StateT>::id;
+
+ /// class codecvt<char, char, mbstate_t> 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;
+
+ protected:
+ __c_locale _M_c_locale_codecvt;
+
+ public:
+ static locale::id id;
+
+ explicit
+ codecvt(size_t __refs = 0);
+
+ explicit
+ codecvt(__c_locale __cloc, 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(state_type&, const extern_type* __from,
+ const extern_type* __end, size_t __max) const;
+
+ virtual int
+ do_max_length() const throw();
+ };
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ /// class codecvt<wchar_t, char, mbstate_t> 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;
+
+ protected:
+ __c_locale _M_c_locale_codecvt;
+
+ public:
+ static locale::id id;
+
+ explicit
+ codecvt(size_t __refs = 0);
+
+ explicit
+ codecvt(__c_locale __cloc, 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(state_type&, const extern_type* __from,
+ const extern_type* __end, size_t __max) const;
+
+ virtual int
+ do_max_length() const throw();
+ };
+#endif //_GLIBCXX_USE_WCHAR_T
+
+ /// class codecvt_byname [22.2.1.6].
+ template<typename _InternT, typename _ExternT, typename _StateT>
+ class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
+ {
+ public:
+ explicit
+ codecvt_byname(const char* __s, size_t __refs = 0)
+ : codecvt<_InternT, _ExternT, _StateT>(__refs)
+ {
+ if (__builtin_strcmp(__s, "C") != 0
+ && __builtin_strcmp(__s, "POSIX") != 0)
+ {
+ this->_S_destroy_c_locale(this->_M_c_locale_codecvt);
+ this->_S_create_c_locale(this->_M_c_locale_codecvt, __s);
+ }
+ }
+
+ protected:
+ virtual
+ ~codecvt_byname() { }
+ };
+
+ // Inhibit implicit instantiations for required instantiations,
+ // which are defined via explicit instantiations elsewhere.
+ // NB: This syntax is a GNU extension.
+#if _GLIBCXX_EXTERN_TEMPLATE
+ extern template class codecvt_byname<char, char, mbstate_t>;
+
+ extern template
+ const codecvt<char, char, mbstate_t>&
+ use_facet<codecvt<char, char, mbstate_t> >(const locale&);
+
+ extern template
+ bool
+ has_facet<codecvt<char, char, mbstate_t> >(const locale&);
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ extern template class codecvt_byname<wchar_t, char, mbstate_t>;
+
+ extern template
+ const codecvt<wchar_t, char, mbstate_t>&
+ use_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&);
+
+ extern template
+ bool
+ has_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&);
+#endif
+#endif
+
+_GLIBCXX_END_NAMESPACE
+
+#endif // _CODECVT_H
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