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// wstring_convert implementation -*- C++ -*-
// Copyright (C) 2015-2021 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
// .
/** @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
#else
#include
#include
#include
#include
#include
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup locales
* @{
*/
template
bool
__do_str_codecvt(const _InChar* __first, const _InChar* __last,
_OutStr& __outstr, const _Codecvt& __cvt, _State& __state,
size_t& __count, _Fn __fn)
{
if (__first == __last)
{
__outstr.clear();
__count = 0;
return true;
}
size_t __outchars = 0;
auto __next = __first;
const auto __maxlen = __cvt.max_length() + 1;
codecvt_base::result __result;
do
{
__outstr.resize(__outstr.size() + (__last - __next) * __maxlen);
auto __outnext = &__outstr.front() + __outchars;
auto const __outlast = &__outstr.back() + 1;
__result = (__cvt.*__fn)(__state, __next, __last, __next,
__outnext, __outlast, __outnext);
__outchars = __outnext - &__outstr.front();
}
while (__result == codecvt_base::partial && __next != __last
&& ptrdiff_t(__outstr.size() - __outchars) < __maxlen);
if (__result == codecvt_base::error)
{
__count = __next - __first;
return false;
}
// The codecvt facet will only return noconv when the types are
// the same, so avoid instantiating basic_string::assign otherwise
if _GLIBCXX17_CONSTEXPR (is_same())
if (__result == codecvt_base::noconv)
{
__outstr.assign(__first, __last);
__count = __last - __first;
return true;
}
__outstr.resize(__outchars);
__count = __next - __first;
return true;
}
// Convert narrow character string to wide.
template
inline bool
__str_codecvt_in(const char* __first, const char* __last,
basic_string<_CharT, _Traits, _Alloc>& __outstr,
const codecvt<_CharT, char, _State>& __cvt,
_State& __state, size_t& __count)
{
using _Codecvt = codecvt<_CharT, char, _State>;
using _ConvFn
= codecvt_base::result
(_Codecvt::*)(_State&, const char*, const char*, const char*&,
_CharT*, _CharT*, _CharT*&) const;