1 // Stream buffer classes -*- C++ -*- 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 4 // 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /** @file bits/streambuf.tcc 27 * This is an internal header file, included by other library headers. 28 * Do not attempt to use it directly. @headername{streambuf} 29 */ 30 31 // 32 // ISO C++ 14882: 27.5 Stream buffers 33 // 34 35 #ifndef _STREAMBUF_TCC 36 #define _STREAMBUF_TCC 1 37 38 #pragma GCC system_header 39 40 namespace std _GLIBCXX_VISIBILITY(default) 41 { 42 _GLIBCXX_BEGIN_NAMESPACE_VERSION 43 44 template<typename _CharT, typename _Traits> 45 streamsize 46 basic_streambuf<_CharT, _Traits>:: 47 xsgetn(char_type* __s, streamsize __n) 48 { 49 streamsize __ret = 0; 50 while (__ret < __n) 51 { 52 const streamsize __buf_len = this->egptr() - this->gptr(); 53 if (__buf_len) 54 { 55 const streamsize __remaining = __n - __ret; 56 const streamsize __len = std::min(__buf_len, __remaining); 57 traits_type::copy(__s, this->gptr(), __len); 58 __ret += __len; 59 __s += __len; 60 this->__safe_gbump(__len); 61 } 62 63 if (__ret < __n) 64 { 65 const int_type __c = this->uflow(); 66 if (!traits_type::eq_int_type(__c, traits_type::eof())) 67 { 68 traits_type::assign(*__s++, traits_type::to_char_type(__c)); 69 ++__ret; 70 } 71 else 72 break; 73 } 74 } 75 return __ret; 76 } 77 78 template<typename _CharT, typename _Traits> 79 streamsize 80 basic_streambuf<_CharT, _Traits>:: 81 xsputn(const char_type* __s, streamsize __n) 82 { 83 streamsize __ret = 0; 84 while (__ret < __n) 85 { 86 const streamsize __buf_len = this->epptr() - this->pptr(); 87 if (__buf_len) 88 { 89 const streamsize __remaining = __n - __ret; 90 const streamsize __len = std::min(__buf_len, __remaining); 91 traits_type::copy(this->pptr(), __s, __len); 92 __ret += __len; 93 __s += __len; 94 this->__safe_pbump(__len); 95 } 96 97 if (__ret < __n) 98 { 99 int_type __c = this->overflow(traits_type::to_int_type(*__s)); 100 if (!traits_type::eq_int_type(__c, traits_type::eof())) 101 { 102 ++__ret; 103 ++__s; 104 } 105 else 106 break; 107 } 108 } 109 return __ret; 110 } 111 112 // Conceivably, this could be used to implement buffer-to-buffer 113 // copies, if this was ever desired in an un-ambiguous way by the 114 // standard. 115 template<typename _CharT, typename _Traits> 116 streamsize 117 __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin, 118 basic_streambuf<_CharT, _Traits>* __sbout, 119 bool& __ineof) 120 { 121 streamsize __ret = 0; 122 __ineof = true; 123 typename _Traits::int_type __c = __sbin->sgetc(); 124 while (!_Traits::eq_int_type(__c, _Traits::eof())) 125 { 126 __c = __sbout->sputc(_Traits::to_char_type(__c)); 127 if (_Traits::eq_int_type(__c, _Traits::eof())) 128 { 129 __ineof = false; 130 break; 131 } 132 ++__ret; 133 __c = __sbin->snextc(); 134 } 135 return __ret; 136 } 137 138 template<typename _CharT, typename _Traits> 139 inline streamsize 140 __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin, 141 basic_streambuf<_CharT, _Traits>* __sbout) 142 { 143 bool __ineof; 144 return __copy_streambufs_eof(__sbin, __sbout, __ineof); 145 } 146 147 // Inhibit implicit instantiations for required instantiations, 148 // which are defined via explicit instantiations elsewhere. 149 #if _GLIBCXX_EXTERN_TEMPLATE 150 extern template class basic_streambuf<char>; 151 extern template 152 streamsize 153 __copy_streambufs(basic_streambuf<char>*, 154 basic_streambuf<char>*); 155 extern template 156 streamsize 157 __copy_streambufs_eof(basic_streambuf<char>*, 158 basic_streambuf<char>*, bool&); 159 160 #ifdef _GLIBCXX_USE_WCHAR_T 161 extern template class basic_streambuf<wchar_t>; 162 extern template 163 streamsize 164 __copy_streambufs(basic_streambuf<wchar_t>*, 165 basic_streambuf<wchar_t>*); 166 extern template 167 streamsize 168 __copy_streambufs_eof(basic_streambuf<wchar_t>*, 169 basic_streambuf<wchar_t>*, bool&); 170 #endif 171 #endif 172 173 _GLIBCXX_END_NAMESPACE_VERSION 174 } // namespace std 175 176 #endif 177
