1 // Stream buffer classes -*- C++ -*- 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 4 // 2006, 2009 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 streambuf.tcc 27 * This is an internal header file, included by other library headers. 28 * You should not attempt to use it directly. 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 _GLIBCXX_BEGIN_NAMESPACE(std) 41 42 template<typename _CharT, typename _Traits> 43 streamsize 44 basic_streambuf<_CharT, _Traits>:: 45 xsgetn(char_type* __s, streamsize __n) 46 { 47 streamsize __ret = 0; 48 while (__ret < __n) 49 { 50 const streamsize __buf_len = this->egptr() - this->gptr(); 51 if (__buf_len) 52 { 53 const streamsize __remaining = __n - __ret; 54 const streamsize __len = std::min(__buf_len, __remaining); 55 traits_type::copy(__s, this->gptr(), __len); 56 __ret += __len; 57 __s += __len; 58 this->gbump(__len); 59 } 60 61 if (__ret < __n) 62 { 63 const int_type __c = this->uflow(); 64 if (!traits_type::eq_int_type(__c, traits_type::eof())) 65 { 66 traits_type::assign(*__s++, traits_type::to_char_type(__c)); 67 ++__ret; 68 } 69 else 70 break; 71 } 72 } 73 return __ret; 74 } 75 76 template<typename _CharT, typename _Traits> 77 streamsize 78 basic_streambuf<_CharT, _Traits>:: 79 xsputn(const char_type* __s, streamsize __n) 80 { 81 streamsize __ret = 0; 82 while (__ret < __n) 83 { 84 const streamsize __buf_len = this->epptr() - this->pptr(); 85 if (__buf_len) 86 { 87 const streamsize __remaining = __n - __ret; 88 const streamsize __len = std::min(__buf_len, __remaining); 89 traits_type::copy(this->pptr(), __s, __len); 90 __ret += __len; 91 __s += __len; 92 this->pbump(__len); 93 } 94 95 if (__ret < __n) 96 { 97 int_type __c = this->overflow(traits_type::to_int_type(*__s)); 98 if (!traits_type::eq_int_type(__c, traits_type::eof())) 99 { 100 ++__ret; 101 ++__s; 102 } 103 else 104 break; 105 } 106 } 107 return __ret; 108 } 109 110 // Conceivably, this could be used to implement buffer-to-buffer 111 // copies, if this was ever desired in an un-ambiguous way by the 112 // standard. 113 template<typename _CharT, typename _Traits> 114 streamsize 115 __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin, 116 basic_streambuf<_CharT, _Traits>* __sbout, 117 bool& __ineof) 118 { 119 streamsize __ret = 0; 120 __ineof = true; 121 typename _Traits::int_type __c = __sbin->sgetc(); 122 while (!_Traits::eq_int_type(__c, _Traits::eof())) 123 { 124 __c = __sbout->sputc(_Traits::to_char_type(__c)); 125 if (_Traits::eq_int_type(__c, _Traits::eof())) 126 { 127 __ineof = false; 128 break; 129 } 130 ++__ret; 131 __c = __sbin->snextc(); 132 } 133 return __ret; 134 } 135 136 template<typename _CharT, typename _Traits> 137 inline streamsize 138 __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin, 139 basic_streambuf<_CharT, _Traits>* __sbout) 140 { 141 bool __ineof; 142 return __copy_streambufs_eof(__sbin, __sbout, __ineof); 143 } 144 145 // Inhibit implicit instantiations for required instantiations, 146 // which are defined via explicit instantiations elsewhere. 147 // NB: This syntax is a GNU extension. 148 #if _GLIBCXX_EXTERN_TEMPLATE 149 extern template class basic_streambuf<char>; 150 extern template 151 streamsize 152 __copy_streambufs(basic_streambuf<char>*, 153 basic_streambuf<char>*); 154 extern template 155 streamsize 156 __copy_streambufs_eof(basic_streambuf<char>*, 157 basic_streambuf<char>*, bool&); 158 159 #ifdef _GLIBCXX_USE_WCHAR_T 160 extern template class basic_streambuf<wchar_t>; 161 extern template 162 streamsize 163 __copy_streambufs(basic_streambuf<wchar_t>*, 164 basic_streambuf<wchar_t>*); 165 extern template 166 streamsize 167 __copy_streambufs_eof(basic_streambuf<wchar_t>*, 168 basic_streambuf<wchar_t>*, bool&); 169 #endif 170 #endif 171 172 _GLIBCXX_END_NAMESPACE 173 174 #endif 175