--- /dev/null
+// wstring_convert implementation -*- C++ -*-
+
+// Copyright (C) 2012 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/locale_conv.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{locale}
+ */
+
+#ifndef _LOCALE_CONV_H
+#define _LOCALE_CONV_H 1
+
+#if __cplusplus < 201103L
+# include <bits/c++0x_warning.h>
+#else
+
+#include <streambuf>
+#include "stringfwd.h"
+#include "allocator.h"
+#include "codecvt.h"
+#include "unique_ptr.h"
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+
+ /**
+ * @addtogroup locales
+ * @{
+ */
+
+ /// String conversions
+ template<typename _Codecvt, typename _Elem = wchar_t,
+ typename _Wide_alloc = allocator<_Elem>,
+ typename _Byte_alloc = allocator<char>>
+ class wstring_convert
+ {
+ public:
+ typedef basic_string<char, char_traits<char>, _Byte_alloc> byte_string;
+ typedef basic_string<_Elem, char_traits<_Elem>, _Wide_alloc> wide_string;
+ typedef typename _Codecvt::state_type state_type;
+ typedef typename wide_string::traits_type::int_type int_type;
+
+ /** Default constructor.
+ *
+ * @param __pcvt The facet to use for conversions.
+ *
+ * Takes ownership of @p __pcvt and will delete it in the destructor.
+ */
+ explicit
+ wstring_convert(_Codecvt* __pcvt = new _Codecvt()) : _M_cvt(__pcvt)
+ {
+ if (!_M_cvt)
+ __throw_logic_error("wstring_convert");
+ }
+
+ /** Construct with an initial converstion state.
+ *
+ * @param __pcvt The facet to use for conversions.
+ * @param __state Initial conversion state.
+ *
+ * Takes ownership of @p __pcvt and will delete it in the destructor.
+ * The object's conversion state will persist between conversions.
+ */
+ wstring_convert(_Codecvt* __pcvt, state_type __state)
+ : _M_cvt(__pcvt), _M_state(__state), _M_with_cvtstate(true)
+ {
+ if (!_M_cvt)
+ __throw_logic_error("wstring_convert");
+ }
+
+ /** Construct with error strings.
+ *
+ * @param __byte_err A string to return on failed conversions.
+ * @param __wide_err A wide string to return on failed conversions.
+ */
+ explicit
+ wstring_convert(const byte_string& __byte_err,
+ const wide_string& __wide_err = wide_string())
+ : _M_cvt(new _Codecvt),
+ _M_byte_err_string(__byte_err), _M_wide_err_string(__wide_err),
+ _M_with_strings(true)
+ {
+ if (!_M_cvt)
+ __throw_logic_error("wstring_convert");
+ }
+
+ ~wstring_convert() = default;
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2176. Special members for wstring_convert and wbuffer_convert
+ wstring_convert(const wstring_convert&) = delete;
+ wstring_convert& operator=(const wstring_convert&) = delete;
+
+ /// @{ Convert from bytes.
+ wide_string
+ from_bytes(char __byte)
+ {
+ char __bytes[2] = { __byte };
+ return from_bytes(__bytes, __bytes+1);
+ }
+
+ wide_string
+ from_bytes(const char* __ptr)
+ { return from_bytes(__ptr, __ptr+char_traits<char>::length(__ptr)); }
+
+ wide_string
+ from_bytes(const byte_string& __str)
+ {
+ auto __ptr = __str.data();
+ return from_bytes(__ptr, __ptr + __str.size());
+ }
+
+ wide_string
+ from_bytes(const char* __first, const char* __last)
+ {
+ auto __errstr = _M_with_strings ? &_M_wide_err_string : nullptr;
+ _ConvFn<char, _Elem> __fn = &_Codecvt::in;
+ return _M_conv(__first, __last, __errstr, __fn);
+ }
+ /// @}
+
+ /// @{ Convert to bytes.
+ byte_string
+ to_bytes(_Elem __wchar)
+ {
+ _Elem __wchars[2] = { __wchar };
+ return to_bytes(__wchars, __wchars+1);
+ }
+
+ byte_string
+ to_bytes(const _Elem* __ptr)
+ {
+ return to_bytes(__ptr, __ptr+wide_string::traits_type::length(__ptr));
+ }
+
+ byte_string
+ to_bytes(const wide_string& __wstr)
+ {
+ auto __ptr = __wstr.data();
+ return to_bytes(__ptr, __ptr + __wstr.size());
+ }
+
+ byte_string
+ to_bytes(const _Elem* __first, const _Elem* __last)
+ {
+ auto __errstr = _M_with_strings ? &_M_byte_err_string : nullptr;
+ _ConvFn<_Elem, char> __fn = &_Codecvt::out;
+ return _M_conv(__first, __last, __errstr, __fn);
+ }
+ /// @}
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2174. wstring_convert::converted() should be noexcept
+ /// The number of elements successfully converted in the last conversion.
+ size_t converted() const noexcept { return _M_count; }
+
+ /// The final conversion state of the last conversion.
+ state_type state() const { return _M_state; }
+
+ private:
+ template<typename _InC, typename _OutC>
+ using _ConvFn
+ = codecvt_base::result
+ (_Codecvt::*)(state_type&, const _InC*, const _InC*, const _InC*&,
+ _OutC*, _OutC*, _OutC*&) const;
+
+ template<typename _InChar, typename _OutStr, typename _MemFn>
+ _OutStr
+ _M_conv(const _InChar* __first, const _InChar* __last,
+ const _OutStr* __err, _MemFn __memfn)
+ {
+ if (!_M_with_cvtstate)
+ _M_state = state_type();
+
+ auto __outstr = __err ? _OutStr(__err->get_allocator()) : _OutStr();
+ size_t __outchars = 0;
+ auto __next = __first;
+
+ codecvt_base::result __result;
+ do
+ {
+ __outstr.resize(__outstr.size() + (__last - __next));
+ auto __outnext = &__outstr.front() + __outchars;
+ auto const __outlast = &__outstr.back() + 1;
+ __result = ((*_M_cvt).*__memfn)(_M_state, __next, __last, __next,
+ __outnext, __outlast, __outnext);
+ __outchars = __outnext - &__outstr.front();
+ }
+ while (__result == codecvt_base::partial && __next != __last);
+
+ __outstr.resize(__outchars);
+ _M_count = __next - __first;
+
+ if (__result != codecvt_base::error)
+ return __outstr;
+ else if (__err)
+ return *__err;
+ else
+ __throw_range_error("wstring_convert");
+ }
+
+ unique_ptr<_Codecvt> _M_cvt;
+ byte_string _M_byte_err_string;
+ wide_string _M_wide_err_string;
+ state_type _M_state = state_type();
+ size_t _M_count = 0;
+ bool _M_with_cvtstate = false;
+ bool _M_with_strings = false;
+ };
+
+ /// Buffer conversions
+ template<typename _Codecvt, typename _Elem = wchar_t,
+ typename _Tr = char_traits<_Elem>>
+ class wbuffer_convert : public basic_streambuf<_Elem, _Tr>
+ {
+ typedef basic_streambuf<_Elem, _Tr> _Wide_streambuf;
+
+ public:
+ typedef typename _Codecvt::state_type state_type;
+
+ /** Default constructor.
+ *
+ * @param __bytebuf The underlying byte stream buffer.
+ * @param __pcvt The facet to use for conversions.
+ * @param __state Initial conversion state.
+ *
+ * Takes ownership of @p __pcvt and will delete it in the destructor.
+ */
+ explicit
+ wbuffer_convert(streambuf* __bytebuf = 0, _Codecvt* __pcvt = new _Codecvt,
+ state_type __state = state_type())
+ : _M_buf(__bytebuf), _M_cvt(__pcvt), _M_state(__state)
+ {
+ if (!_M_cvt)
+ __throw_logic_error("wstring_convert");
+
+ _M_always_noconv = _M_cvt->always_noconv();
+
+ if (_M_buf)
+ {
+ this->setp(_M_put_area, _M_put_area + _S_buffer_length);
+ this->setg(_M_get_area + _S_putback_length,
+ _M_get_area + _S_putback_length,
+ _M_get_area + _S_putback_length);
+ }
+ }
+
+ ~wbuffer_convert() = default;
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2176. Special members for wstring_convert and wbuffer_convert
+ wbuffer_convert(const wbuffer_convert&) = delete;
+ wbuffer_convert& operator=(const wbuffer_convert&) = delete;
+
+ streambuf* rdbuf() const noexcept { return _M_buf; }
+
+ streambuf*
+ rdbuf(streambuf *__bytebuf) noexcept
+ {
+ auto __prev = _M_buf;
+ _M_buf = __bytebuf;
+ return __prev;
+ }
+
+ /// The conversion state following the last conversion.
+ state_type state() const noexcept { return _M_state; }
+
+ protected:
+ int
+ sync()
+ { return _M_buf && _M_conv_put() && _M_buf->pubsync() ? 0 : -1; }
+
+ typename _Wide_streambuf::int_type
+ overflow(typename _Wide_streambuf::int_type __out)
+ {
+ if (!_M_buf || !_M_conv_put())
+ return _Tr::eof();
+ else if (!_Tr::eq_int_type(__out, _Tr::eof()))
+ return this->sputc(__out);
+ return _Tr::not_eof(__out);
+ }
+
+ typename _Wide_streambuf::int_type
+ underflow()
+ {
+ if (!_M_buf)
+ return _Tr::eof();
+
+ if (this->gptr() < this->egptr() || (_M_buf && _M_conv_get()))
+ return _Tr::to_int_type(*this->gptr());
+ else
+ return _Tr::eof();
+ }
+
+ streamsize
+ xsputn(const typename _Wide_streambuf::char_type* __s, streamsize __n)
+ {
+ if (!_M_buf || __n == 0)
+ return 0;
+ streamsize __done = 0;
+ do
+ {
+ auto __nn = std::min<streamsize>(this->epptr() - this->pptr(),
+ __n - __done);
+ _Tr::copy(this->pptr(), __s + __done, __nn);
+ this->pbump(__nn);
+ __done += __nn;
+ } while (__done < __n && _M_conv_put());
+ return __done;
+ }
+
+ private:
+ // fill the get area from converted contents of the byte stream buffer
+ bool
+ _M_conv_get()
+ {
+ const streamsize __pb1 = this->gptr() - this->eback();
+ const streamsize __pb2 = _S_putback_length;
+ const streamsize __npb = std::min(__pb1, __pb2);
+
+ _Tr::move(_M_get_area + _S_putback_length - __npb,
+ this->gptr() - __npb, __npb);
+
+ streamsize __nbytes = sizeof(_M_get_buf) - _M_unconv;
+ __nbytes = std::min(__nbytes, _M_buf->in_avail());
+ if (__nbytes < 1)
+ __nbytes == 1;
+ __nbytes = _M_buf->sgetn(_M_get_buf + _M_unconv, __nbytes);
+ if (__nbytes < 1)
+ return false;
+ __nbytes += _M_unconv;
+
+ // convert _M_get_buf into _M_get_area
+
+ _Elem* __outbuf = _M_get_area + _S_putback_length;
+ _Elem* __outnext = __outbuf;
+ const char* __bnext = _M_get_buf;
+
+ codecvt_base::result __result;
+ if (_M_always_noconv)
+ __result = codecvt_base::noconv;
+ else
+ {
+ _Elem* __outend = _M_get_area + _S_buffer_length;
+
+ __result = _M_cvt->in(_M_state,
+ __bnext, __bnext + __nbytes, __bnext,
+ __outbuf, __outend, __outnext);
+ }
+
+ if (__result == codecvt_base::noconv)
+ {
+ // cast is safe because noconv means _Elem is same type as char
+ auto __get_buf = reinterpret_cast<const _Elem*>(_M_get_buf);
+ _Tr::copy(__outbuf, __get_buf, __nbytes);
+ _M_unconv = 0;
+ return true;
+ }
+
+ if ((_M_unconv = _M_get_buf + __nbytes - __bnext))
+ char_traits<char>::move(_M_get_buf, __bnext, _M_unconv);
+
+ this->setg(__outbuf, __outbuf, __outnext);
+
+ return __result != codecvt_base::error;
+ }
+
+ // unused
+ bool
+ _M_put(...)
+ { return false; }
+
+ bool
+ _M_put(const char* __p, streamsize __n)
+ {
+ if (_M_buf->sputn(__p, __n) < __n)
+ return false;
+ }
+
+ // convert the put area and write to the byte stream buffer
+ bool
+ _M_conv_put()
+ {
+ _Elem* const __first = this->pbase();
+ const _Elem* const __last = this->pptr();
+ const streamsize __pending = __last - __first;
+
+ if (_M_always_noconv)
+ return _M_put(__first, __pending);
+
+ char __outbuf[2 * _S_buffer_length];
+
+ const _Elem* __next = __first;
+ const _Elem* __start;
+ do
+ {
+ __start = __next;
+ char* __outnext = __outbuf;
+ char* const __outlast = __outbuf + sizeof(__outbuf);
+ auto __result = _M_cvt->out(_M_state, __next, __last, __next,
+ __outnext, __outlast, __outnext);
+ if (__result == codecvt_base::error)
+ return false;
+ else if (__result == codecvt_base::noconv)
+ return _M_put(__next, __pending);
+
+ if (!_M_put(__outbuf, __outnext - __outbuf))
+ return false;
+ }
+ while (__next != __last && __next != __start);
+
+ if (__next != __last)
+ _Tr::move(__first, __next, __last - __next);
+
+ this->pbump(__first - __next);
+ return __next != __first;
+ }
+
+ streambuf* _M_buf;
+ unique_ptr<_Codecvt> _M_cvt;
+ state_type _M_state;
+
+ static const streamsize _S_buffer_length = 32;
+ static const streamsize _S_putback_length = 3;
+ _Elem _M_put_area[_S_buffer_length];
+ _Elem _M_get_area[_S_buffer_length];
+ streamsize _M_unconv = 0;
+ char _M_get_buf[_S_buffer_length-_S_putback_length];
+ bool _M_always_noconv;
+ };
+
+ /// @} group locales
+
+#endif // _GLIBCXX_USE_WCHAR_T
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif // __cplusplus
+
+#endif /* _LOCALE_CONV_H */
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