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619 lines
18 KiB
619 lines
18 KiB
// wstring_convert implementation -*- C++ -*-
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// Copyright (C) 2015-2021 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 3, 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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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/locale_conv.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{locale}
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*/
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#ifndef _LOCALE_CONV_H
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#define _LOCALE_CONV_H 1
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
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#else
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#include <streambuf>
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#include <bits/stringfwd.h>
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#include <bits/allocator.h>
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#include <bits/codecvt.h>
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#include <bits/unique_ptr.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @addtogroup locales
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* @{
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*/
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template<typename _OutStr, typename _InChar, typename _Codecvt,
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typename _State, typename _Fn>
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bool
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__do_str_codecvt(const _InChar* __first, const _InChar* __last,
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_OutStr& __outstr, const _Codecvt& __cvt, _State& __state,
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size_t& __count, _Fn __fn)
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{
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if (__first == __last)
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{
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__outstr.clear();
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__count = 0;
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return true;
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}
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size_t __outchars = 0;
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auto __next = __first;
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const auto __maxlen = __cvt.max_length() + 1;
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codecvt_base::result __result;
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do
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{
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__outstr.resize(__outstr.size() + (__last - __next) * __maxlen);
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auto __outnext = &__outstr.front() + __outchars;
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auto const __outlast = &__outstr.back() + 1;
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__result = (__cvt.*__fn)(__state, __next, __last, __next,
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__outnext, __outlast, __outnext);
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__outchars = __outnext - &__outstr.front();
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}
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while (__result == codecvt_base::partial && __next != __last
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&& ptrdiff_t(__outstr.size() - __outchars) < __maxlen);
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if (__result == codecvt_base::error)
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{
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__count = __next - __first;
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return false;
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}
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// The codecvt facet will only return noconv when the types are
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// the same, so avoid instantiating basic_string::assign otherwise
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if _GLIBCXX17_CONSTEXPR (is_same<typename _Codecvt::intern_type,
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typename _Codecvt::extern_type>())
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if (__result == codecvt_base::noconv)
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{
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__outstr.assign(__first, __last);
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__count = __last - __first;
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return true;
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}
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__outstr.resize(__outchars);
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__count = __next - __first;
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return true;
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}
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// Convert narrow character string to wide.
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template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
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inline bool
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__str_codecvt_in(const char* __first, const char* __last,
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basic_string<_CharT, _Traits, _Alloc>& __outstr,
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const codecvt<_CharT, char, _State>& __cvt,
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_State& __state, size_t& __count)
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{
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using _Codecvt = codecvt<_CharT, char, _State>;
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using _ConvFn
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= codecvt_base::result
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(_Codecvt::*)(_State&, const char*, const char*, const char*&,
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_CharT*, _CharT*, _CharT*&) const;
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_ConvFn __fn = &codecvt<_CharT, char, _State>::in;
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return __do_str_codecvt(__first, __last, __outstr, __cvt, __state,
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__count, __fn);
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}
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// As above, but with no __count parameter
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template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
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inline bool
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__str_codecvt_in(const char* __first, const char* __last,
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basic_string<_CharT, _Traits, _Alloc>& __outstr,
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const codecvt<_CharT, char, _State>& __cvt)
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{
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_State __state = {};
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size_t __n;
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return __str_codecvt_in(__first, __last, __outstr, __cvt, __state, __n);
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}
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// As above, but returns false for partial conversion
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template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
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inline bool
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__str_codecvt_in_all(const char* __first, const char* __last,
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basic_string<_CharT, _Traits, _Alloc>& __outstr,
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const codecvt<_CharT, char, _State>& __cvt)
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{
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_State __state = {};
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size_t __n;
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return __str_codecvt_in(__first, __last, __outstr, __cvt, __state, __n)
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&& (__n == size_t(__last - __first));
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}
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// Convert wide character string to narrow.
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template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
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inline bool
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__str_codecvt_out(const _CharT* __first, const _CharT* __last,
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basic_string<char, _Traits, _Alloc>& __outstr,
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const codecvt<_CharT, char, _State>& __cvt,
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_State& __state, size_t& __count)
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{
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using _Codecvt = codecvt<_CharT, char, _State>;
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using _ConvFn
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= codecvt_base::result
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(_Codecvt::*)(_State&, const _CharT*, const _CharT*, const _CharT*&,
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char*, char*, char*&) const;
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_ConvFn __fn = &codecvt<_CharT, char, _State>::out;
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return __do_str_codecvt(__first, __last, __outstr, __cvt, __state,
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__count, __fn);
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}
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// As above, but with no __count parameter
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template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
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inline bool
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__str_codecvt_out(const _CharT* __first, const _CharT* __last,
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basic_string<char, _Traits, _Alloc>& __outstr,
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const codecvt<_CharT, char, _State>& __cvt)
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{
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_State __state = {};
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size_t __n;
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return __str_codecvt_out(__first, __last, __outstr, __cvt, __state, __n);
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}
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// As above, but returns false for partial conversions
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template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
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inline bool
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__str_codecvt_out_all(const _CharT* __first, const _CharT* __last,
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basic_string<char, _Traits, _Alloc>& __outstr,
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const codecvt<_CharT, char, _State>& __cvt)
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{
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_State __state = {};
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size_t __n;
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return __str_codecvt_out(__first, __last, __outstr, __cvt, __state, __n)
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&& (__n == size_t(__last - __first));
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}
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#ifdef _GLIBCXX_USE_CHAR8_T
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// Convert wide character string to narrow.
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template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
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inline bool
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__str_codecvt_out(const _CharT* __first, const _CharT* __last,
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basic_string<char8_t, _Traits, _Alloc>& __outstr,
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const codecvt<_CharT, char8_t, _State>& __cvt,
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_State& __state, size_t& __count)
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{
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using _Codecvt = codecvt<_CharT, char8_t, _State>;
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using _ConvFn
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= codecvt_base::result
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(_Codecvt::*)(_State&, const _CharT*, const _CharT*, const _CharT*&,
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char8_t*, char8_t*, char8_t*&) const;
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_ConvFn __fn = &codecvt<_CharT, char8_t, _State>::out;
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return __do_str_codecvt(__first, __last, __outstr, __cvt, __state,
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__count, __fn);
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}
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template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
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inline bool
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__str_codecvt_out(const _CharT* __first, const _CharT* __last,
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basic_string<char8_t, _Traits, _Alloc>& __outstr,
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const codecvt<_CharT, char8_t, _State>& __cvt)
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{
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_State __state = {};
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size_t __n;
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return __str_codecvt_out(__first, __last, __outstr, __cvt, __state, __n);
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}
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#endif // _GLIBCXX_USE_CHAR8_T
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#ifdef _GLIBCXX_USE_WCHAR_T
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_GLIBCXX_BEGIN_NAMESPACE_CXX11
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/// String conversions
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template<typename _Codecvt, typename _Elem = wchar_t,
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typename _Wide_alloc = allocator<_Elem>,
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typename _Byte_alloc = allocator<char>>
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class wstring_convert
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{
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public:
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typedef basic_string<char, char_traits<char>, _Byte_alloc> byte_string;
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typedef basic_string<_Elem, char_traits<_Elem>, _Wide_alloc> wide_string;
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typedef typename _Codecvt::state_type state_type;
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typedef typename wide_string::traits_type::int_type int_type;
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/// Default constructor.
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wstring_convert() : _M_cvt(new _Codecvt()) { }
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/** Constructor.
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*
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* @param __pcvt The facet to use for conversions.
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*
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* Takes ownership of @p __pcvt and will delete it in the destructor.
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*/
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explicit
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wstring_convert(_Codecvt* __pcvt) : _M_cvt(__pcvt)
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{
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if (!_M_cvt)
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__throw_logic_error("wstring_convert");
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}
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/** Construct with an initial converstion state.
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*
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* @param __pcvt The facet to use for conversions.
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* @param __state Initial conversion state.
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*
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* Takes ownership of @p __pcvt and will delete it in the destructor.
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* The object's conversion state will persist between conversions.
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*/
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wstring_convert(_Codecvt* __pcvt, state_type __state)
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: _M_cvt(__pcvt), _M_state(__state), _M_with_cvtstate(true)
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{
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if (!_M_cvt)
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__throw_logic_error("wstring_convert");
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}
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/** Construct with error strings.
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*
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* @param __byte_err A string to return on failed conversions.
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* @param __wide_err A wide string to return on failed conversions.
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*/
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explicit
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wstring_convert(const byte_string& __byte_err,
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const wide_string& __wide_err = wide_string())
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: _M_cvt(new _Codecvt),
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_M_byte_err_string(__byte_err), _M_wide_err_string(__wide_err),
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_M_with_strings(true)
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{
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if (!_M_cvt)
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__throw_logic_error("wstring_convert");
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}
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~wstring_convert() = default;
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 2176. Special members for wstring_convert and wbuffer_convert
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wstring_convert(const wstring_convert&) = delete;
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wstring_convert& operator=(const wstring_convert&) = delete;
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/// @{ Convert from bytes.
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wide_string
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from_bytes(char __byte)
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{
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char __bytes[2] = { __byte };
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return from_bytes(__bytes, __bytes+1);
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}
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wide_string
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from_bytes(const char* __ptr)
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{ return from_bytes(__ptr, __ptr+char_traits<char>::length(__ptr)); }
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wide_string
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from_bytes(const byte_string& __str)
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{
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auto __ptr = __str.data();
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return from_bytes(__ptr, __ptr + __str.size());
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}
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wide_string
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from_bytes(const char* __first, const char* __last)
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{
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if (!_M_with_cvtstate)
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_M_state = state_type();
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wide_string __out{ _M_wide_err_string.get_allocator() };
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if (__str_codecvt_in(__first, __last, __out, *_M_cvt, _M_state,
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_M_count))
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return __out;
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if (_M_with_strings)
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return _M_wide_err_string;
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__throw_range_error("wstring_convert::from_bytes");
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}
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/// @}
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/// @{ Convert to bytes.
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byte_string
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to_bytes(_Elem __wchar)
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{
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_Elem __wchars[2] = { __wchar };
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return to_bytes(__wchars, __wchars+1);
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}
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byte_string
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to_bytes(const _Elem* __ptr)
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{
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return to_bytes(__ptr, __ptr+wide_string::traits_type::length(__ptr));
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}
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byte_string
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to_bytes(const wide_string& __wstr)
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{
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auto __ptr = __wstr.data();
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return to_bytes(__ptr, __ptr + __wstr.size());
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}
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byte_string
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to_bytes(const _Elem* __first, const _Elem* __last)
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{
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if (!_M_with_cvtstate)
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_M_state = state_type();
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byte_string __out{ _M_byte_err_string.get_allocator() };
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if (__str_codecvt_out(__first, __last, __out, *_M_cvt, _M_state,
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_M_count))
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return __out;
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if (_M_with_strings)
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return _M_byte_err_string;
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__throw_range_error("wstring_convert::to_bytes");
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}
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/// @}
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 2174. wstring_convert::converted() should be noexcept
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/// The number of elements successfully converted in the last conversion.
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size_t converted() const noexcept { return _M_count; }
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/// The final conversion state of the last conversion.
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state_type state() const { return _M_state; }
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private:
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unique_ptr<_Codecvt> _M_cvt;
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byte_string _M_byte_err_string;
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wide_string _M_wide_err_string;
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state_type _M_state = state_type();
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size_t _M_count = 0;
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bool _M_with_cvtstate = false;
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bool _M_with_strings = false;
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};
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_GLIBCXX_END_NAMESPACE_CXX11
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/// Buffer conversions
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template<typename _Codecvt, typename _Elem = wchar_t,
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typename _Tr = char_traits<_Elem>>
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class wbuffer_convert : public basic_streambuf<_Elem, _Tr>
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{
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typedef basic_streambuf<_Elem, _Tr> _Wide_streambuf;
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public:
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typedef typename _Codecvt::state_type state_type;
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/// Default constructor.
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wbuffer_convert() : wbuffer_convert(nullptr) { }
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/** Constructor.
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*
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* @param __bytebuf The underlying byte stream buffer.
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* @param __pcvt The facet to use for conversions.
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* @param __state Initial conversion state.
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*
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* Takes ownership of @p __pcvt and will delete it in the destructor.
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*/
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explicit
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wbuffer_convert(streambuf* __bytebuf, _Codecvt* __pcvt = new _Codecvt,
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state_type __state = state_type())
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: _M_buf(__bytebuf), _M_cvt(__pcvt), _M_state(__state)
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{
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if (!_M_cvt)
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__throw_logic_error("wbuffer_convert");
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_M_always_noconv = _M_cvt->always_noconv();
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if (_M_buf)
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{
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this->setp(_M_put_area, _M_put_area + _S_buffer_length);
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this->setg(_M_get_area + _S_putback_length,
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_M_get_area + _S_putback_length,
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_M_get_area + _S_putback_length);
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}
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}
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~wbuffer_convert() = default;
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 2176. Special members for wstring_convert and wbuffer_convert
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wbuffer_convert(const wbuffer_convert&) = delete;
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wbuffer_convert& operator=(const wbuffer_convert&) = delete;
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streambuf* rdbuf() const noexcept { return _M_buf; }
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streambuf*
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rdbuf(streambuf *__bytebuf) noexcept
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{
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auto __prev = _M_buf;
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_M_buf = __bytebuf;
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return __prev;
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}
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/// The conversion state following the last conversion.
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state_type state() const noexcept { return _M_state; }
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protected:
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int
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sync()
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{ return _M_buf && _M_conv_put() && !_M_buf->pubsync() ? 0 : -1; }
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typename _Wide_streambuf::int_type
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overflow(typename _Wide_streambuf::int_type __out)
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{
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if (!_M_buf || !_M_conv_put())
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return _Tr::eof();
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else if (!_Tr::eq_int_type(__out, _Tr::eof()))
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return this->sputc(__out);
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return _Tr::not_eof(__out);
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}
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typename _Wide_streambuf::int_type
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underflow()
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{
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if (!_M_buf)
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return _Tr::eof();
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if (this->gptr() < this->egptr() || (_M_buf && _M_conv_get()))
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return _Tr::to_int_type(*this->gptr());
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else
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return _Tr::eof();
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}
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streamsize
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xsputn(const typename _Wide_streambuf::char_type* __s, streamsize __n)
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{
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if (!_M_buf || __n == 0)
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return 0;
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streamsize __done = 0;
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do
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{
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auto __nn = std::min<streamsize>(this->epptr() - this->pptr(),
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__n - __done);
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_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;
|
|
return true;
|
|
}
|
|
|
|
// 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;
|
|
};
|
|
|
|
#endif // _GLIBCXX_USE_WCHAR_T
|
|
|
|
/// @} group locales
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif // __cplusplus
|
|
|
|
#endif /* _LOCALE_CONV_H */
|