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// Stream buffer classes -*- 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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|
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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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|
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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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|
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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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|
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/** @file bits/streambuf.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{streambuf} |
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*/ |
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|
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// |
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// ISO C++ 14882: 27.5 Stream buffers |
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// |
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|
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#ifndef _STREAMBUF_TCC |
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#define _STREAMBUF_TCC 1 |
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|
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#pragma GCC system_header |
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|
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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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template<typename _CharT, typename _Traits> |
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streamsize |
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basic_streambuf<_CharT, _Traits>:: |
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xsgetn(char_type* __s, streamsize __n) |
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{ |
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streamsize __ret = 0; |
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while (__ret < __n) |
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{ |
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const streamsize __buf_len = this->egptr() - this->gptr(); |
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if (__buf_len) |
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{ |
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const streamsize __remaining = __n - __ret; |
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const streamsize __len = std::min(__buf_len, __remaining); |
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traits_type::copy(__s, this->gptr(), __len); |
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__ret += __len; |
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__s += __len; |
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this->__safe_gbump(__len); |
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} |
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|
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if (__ret < __n) |
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{ |
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const int_type __c = this->uflow(); |
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if (!traits_type::eq_int_type(__c, traits_type::eof())) |
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{ |
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traits_type::assign(*__s++, traits_type::to_char_type(__c)); |
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++__ret; |
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} |
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else |
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break; |
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} |
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} |
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return __ret; |
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} |
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|
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template<typename _CharT, typename _Traits> |
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streamsize |
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basic_streambuf<_CharT, _Traits>:: |
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xsputn(const char_type* __s, streamsize __n) |
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{ |
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streamsize __ret = 0; |
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while (__ret < __n) |
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{ |
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const streamsize __buf_len = this->epptr() - this->pptr(); |
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if (__buf_len) |
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{ |
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const streamsize __remaining = __n - __ret; |
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const streamsize __len = std::min(__buf_len, __remaining); |
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traits_type::copy(this->pptr(), __s, __len); |
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__ret += __len; |
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__s += __len; |
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this->__safe_pbump(__len); |
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} |
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|
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if (__ret < __n) |
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{ |
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int_type __c = this->overflow(traits_type::to_int_type(*__s)); |
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if (!traits_type::eq_int_type(__c, traits_type::eof())) |
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{ |
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++__ret; |
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++__s; |
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} |
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else |
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break; |
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} |
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} |
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return __ret; |
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} |
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|
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// Conceivably, this could be used to implement buffer-to-buffer |
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// copies, if this was ever desired in an un-ambiguous way by the |
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// standard. |
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template<typename _CharT, typename _Traits> |
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streamsize |
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__copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin, |
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basic_streambuf<_CharT, _Traits>* __sbout, |
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bool& __ineof) |
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{ |
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streamsize __ret = 0; |
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__ineof = true; |
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typename _Traits::int_type __c = __sbin->sgetc(); |
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while (!_Traits::eq_int_type(__c, _Traits::eof())) |
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{ |
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__c = __sbout->sputc(_Traits::to_char_type(__c)); |
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if (_Traits::eq_int_type(__c, _Traits::eof())) |
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{ |
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__ineof = false; |
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break; |
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} |
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++__ret; |
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__c = __sbin->snextc(); |
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} |
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return __ret; |
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} |
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|
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template<typename _CharT, typename _Traits> |
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inline streamsize |
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__copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin, |
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basic_streambuf<_CharT, _Traits>* __sbout) |
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{ |
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bool __ineof; |
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return __copy_streambufs_eof(__sbin, __sbout, __ineof); |
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} |
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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_streambuf<char>; |
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extern template |
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streamsize |
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__copy_streambufs(basic_streambuf<char>*, |
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basic_streambuf<char>*); |
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extern template |
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streamsize |
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__copy_streambufs_eof(basic_streambuf<char>*, |
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basic_streambuf<char>*, bool&); |
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|
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#ifdef _GLIBCXX_USE_WCHAR_T |
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extern template class basic_streambuf<wchar_t>; |
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extern template |
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streamsize |
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__copy_streambufs(basic_streambuf<wchar_t>*, |
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basic_streambuf<wchar_t>*); |
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extern template |
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streamsize |
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__copy_streambufs_eof(basic_streambuf<wchar_t>*, |
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basic_streambuf<wchar_t>*, bool&); |
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#endif |
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#endif |
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|
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace std |
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|
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#endif |
