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308 lines
9.9 KiB
308 lines
9.9 KiB
// String based streams -*- C++ -*-
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// Copyright (C) 1997-2021 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/sstream.tcc
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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{sstream}
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*/
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//
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// ISO C++ 14882: 27.7 String-based streams
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//
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#ifndef _SSTREAM_TCC
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#define _SSTREAM_TCC 1
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#pragma GCC system_header
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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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template <class _CharT, class _Traits, class _Alloc>
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typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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pbackfail(int_type __c)
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{
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int_type __ret = traits_type::eof();
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if (this->eback() < this->gptr())
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{
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// Try to put back __c into input sequence in one of three ways.
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// Order these tests done in is unspecified by the standard.
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const bool __testeof = traits_type::eq_int_type(__c, __ret);
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if (!__testeof)
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{
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const bool __testeq = traits_type::eq(traits_type::
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to_char_type(__c),
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this->gptr()[-1]);
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const bool __testout = this->_M_mode & ios_base::out;
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if (__testeq || __testout)
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{
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this->gbump(-1);
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if (!__testeq)
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*this->gptr() = traits_type::to_char_type(__c);
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__ret = __c;
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}
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}
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else
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{
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this->gbump(-1);
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__ret = traits_type::not_eof(__c);
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}
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}
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return __ret;
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}
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template <class _CharT, class _Traits, class _Alloc>
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typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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overflow(int_type __c)
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{
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const bool __testout = this->_M_mode & ios_base::out;
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if (__builtin_expect(!__testout, false))
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return traits_type::eof();
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const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
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if (__builtin_expect(__testeof, false))
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return traits_type::not_eof(__c);
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const __size_type __capacity = _M_string.capacity();
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#if _GLIBCXX_USE_CXX11_ABI
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if (size_t(this->epptr() - this->pbase()) < __capacity)
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{
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// There is additional capacity in _M_string that can be used.
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char_type* __base = const_cast<char_type*>(_M_string.data());
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_M_pbump(__base, __base + __capacity, this->pptr() - this->pbase());
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if (_M_mode & ios_base::in)
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{
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const __size_type __nget = this->gptr() - this->eback();
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const __size_type __eget = this->egptr() - this->eback();
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this->setg(__base, __base + __nget, __base + __eget + 1);
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}
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*this->pptr() = traits_type::to_char_type(__c);
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this->pbump(1);
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return __c;
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}
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#endif
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const __size_type __max_size = _M_string.max_size();
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const bool __testput = this->pptr() < this->epptr();
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if (__builtin_expect(!__testput && __capacity == __max_size, false))
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return traits_type::eof();
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// Try to append __c into output sequence in one of two ways.
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// Order these tests done in is unspecified by the standard.
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const char_type __conv = traits_type::to_char_type(__c);
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if (!__testput)
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{
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// NB: Start ostringstream buffers at 512 chars. This is an
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// experimental value (pronounced "arbitrary" in some of the
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// hipper English-speaking countries), and can be changed to
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// suit particular needs.
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//
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 169. Bad efficiency of overflow() mandated
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// 432. stringbuf::overflow() makes only one write position
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// available
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const __size_type __opt_len = std::max(__size_type(2 * __capacity),
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__size_type(512));
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const __size_type __len = std::min(__opt_len, __max_size);
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__string_type __tmp(_M_string.get_allocator());
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__tmp.reserve(__len);
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if (this->pbase())
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__tmp.assign(this->pbase(), this->epptr() - this->pbase());
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__tmp.push_back(__conv);
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_M_string.swap(__tmp);
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_M_sync(const_cast<char_type*>(_M_string.data()),
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this->gptr() - this->eback(), this->pptr() - this->pbase());
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}
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else
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*this->pptr() = __conv;
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this->pbump(1);
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return __c;
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}
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template <class _CharT, class _Traits, class _Alloc>
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typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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underflow()
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{
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int_type __ret = traits_type::eof();
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const bool __testin = this->_M_mode & ios_base::in;
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if (__testin)
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{
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// Update egptr() to match the actual string end.
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_M_update_egptr();
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if (this->gptr() < this->egptr())
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__ret = traits_type::to_int_type(*this->gptr());
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}
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return __ret;
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}
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template <class _CharT, class _Traits, class _Alloc>
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typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
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{
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pos_type __ret = pos_type(off_type(-1));
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bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
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bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
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const bool __testboth = __testin && __testout && __way != ios_base::cur;
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__testin &= !(__mode & ios_base::out);
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__testout &= !(__mode & ios_base::in);
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 453. basic_stringbuf::seekoff need not always fail for an empty stream.
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const char_type* __beg = __testin ? this->eback() : this->pbase();
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if ((__beg || !__off) && (__testin || __testout || __testboth))
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{
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_M_update_egptr();
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off_type __newoffi = __off;
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off_type __newoffo = __newoffi;
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if (__way == ios_base::cur)
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{
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__newoffi += this->gptr() - __beg;
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__newoffo += this->pptr() - __beg;
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}
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else if (__way == ios_base::end)
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__newoffo = __newoffi += this->egptr() - __beg;
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if ((__testin || __testboth)
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&& __newoffi >= 0
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&& this->egptr() - __beg >= __newoffi)
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{
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this->setg(this->eback(), this->eback() + __newoffi,
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this->egptr());
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__ret = pos_type(__newoffi);
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}
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if ((__testout || __testboth)
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&& __newoffo >= 0
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&& this->egptr() - __beg >= __newoffo)
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{
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_M_pbump(this->pbase(), this->epptr(), __newoffo);
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__ret = pos_type(__newoffo);
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}
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}
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return __ret;
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}
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template <class _CharT, class _Traits, class _Alloc>
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typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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seekpos(pos_type __sp, ios_base::openmode __mode)
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{
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pos_type __ret = pos_type(off_type(-1));
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const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
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const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
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const char_type* __beg = __testin ? this->eback() : this->pbase();
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if ((__beg || !off_type(__sp)) && (__testin || __testout))
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{
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_M_update_egptr();
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const off_type __pos(__sp);
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const bool __testpos = (0 <= __pos
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&& __pos <= this->egptr() - __beg);
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if (__testpos)
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{
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if (__testin)
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this->setg(this->eback(), this->eback() + __pos,
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this->egptr());
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if (__testout)
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_M_pbump(this->pbase(), this->epptr(), __pos);
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__ret = __sp;
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}
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}
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return __ret;
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}
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template <class _CharT, class _Traits, class _Alloc>
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void
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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_M_sync(char_type* __base, __size_type __i, __size_type __o)
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{
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const bool __testin = _M_mode & ios_base::in;
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const bool __testout = _M_mode & ios_base::out;
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char_type* __endg = __base + _M_string.size();
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char_type* __endp = __base + _M_string.capacity();
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if (__base != _M_string.data())
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{
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// setbuf: __i == size of buffer area (_M_string.size() == 0).
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__endg += __i;
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__i = 0;
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__endp = __endg;
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}
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if (__testin)
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this->setg(__base, __base + __i, __endg);
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if (__testout)
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{
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_M_pbump(__base, __endp, __o);
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// egptr() always tracks the string end. When !__testin,
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// for the correct functioning of the streambuf inlines
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// the other get area pointers are identical.
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if (!__testin)
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this->setg(__endg, __endg, __endg);
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}
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}
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template <class _CharT, class _Traits, class _Alloc>
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void
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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_M_pbump(char_type* __pbeg, char_type* __pend, off_type __off)
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{
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this->setp(__pbeg, __pend);
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while (__off > __gnu_cxx::__numeric_traits<int>::__max)
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{
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this->pbump(__gnu_cxx::__numeric_traits<int>::__max);
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__off -= __gnu_cxx::__numeric_traits<int>::__max;
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}
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this->pbump(__off);
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}
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// Inhibit implicit instantiations for required instantiations,
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// which are defined via explicit instantiations elsewhere.
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#if _GLIBCXX_EXTERN_TEMPLATE
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extern template class basic_stringbuf<char>;
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extern template class basic_istringstream<char>;
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extern template class basic_ostringstream<char>;
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extern template class basic_stringstream<char>;
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#ifdef _GLIBCXX_USE_WCHAR_T
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extern template class basic_stringbuf<wchar_t>;
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extern template class basic_istringstream<wchar_t>;
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extern template class basic_ostringstream<wchar_t>;
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extern template class basic_stringstream<wchar_t>;
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#endif
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#endif
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif
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