1// Stream buffer classes -*- C++ -*- 
2 
3// Copyright (C) 1997-2021 Free Software Foundation, Inc. 
4// 
5// This file is part of the GNU ISO C++ Library. This library is free 
6// software; you can redistribute it and/or modify it under the 
7// terms of the GNU General Public License as published by the 
8// Free Software Foundation; either version 3, or (at your option) 
9// any later version. 
10 
11// This library is distributed in the hope that it will be useful, 
12// but WITHOUT ANY WARRANTY; without even the implied warranty of 
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
14// GNU General Public License for more details. 
15 
16// Under Section 7 of GPL version 3, you are granted additional 
17// permissions described in the GCC Runtime Library Exception, version 
18// 3.1, as published by the Free Software Foundation. 
19 
20// You should have received a copy of the GNU General Public License and 
21// a copy of the GCC Runtime Library Exception along with this program; 
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 
23// <http://www.gnu.org/licenses/>. 
24 
25/** @file bits/streambuf.tcc 
26 * This is an internal header file, included by other library headers. 
27 * Do not attempt to use it directly. @headername{streambuf} 
28 */ 
29 
30// 
31// ISO C++ 14882: 27.5 Stream buffers 
32// 
33 
34#ifndef _STREAMBUF_TCC 
35#define _STREAMBUF_TCC 1 
36 
37#pragma GCC system_header 
38 
39namespace std _GLIBCXX_VISIBILITY(default) 
40{ 
41_GLIBCXX_BEGIN_NAMESPACE_VERSION 
42 
43 template<typename _CharT, typename _Traits> 
44 streamsize 
45 basic_streambuf<_CharT, _Traits>:: 
46 xsgetn(char_type* __s, streamsize __n) 
47 { 
48 streamsize __ret = 0; 
49 while (__ret < __n) 
50 { 
51 const streamsize __buf_len = this->egptr() - this->gptr(); 
52 if (__buf_len) 
53 { 
54 const streamsize __remaining = __n - __ret; 
55 const streamsize __len = std::min(a: __buf_len, b: __remaining); 
56 traits_type::copy(__s, this->gptr(), __len); 
57 __ret += __len; 
58 __s += __len; 
59 this->__safe_gbump(__len); 
60 } 
61 
62 if (__ret < __n) 
63 { 
64 const int_type __c = this->uflow(); 
65 if (!traits_type::eq_int_type(__c, traits_type::eof())) 
66 { 
67 traits_type::assign(*__s++, traits_type::to_char_type(__c)); 
68 ++__ret; 
69 } 
70 else 
71 break; 
72 } 
73 } 
74 return __ret; 
75 } 
76 
77 template<typename _CharT, typename _Traits> 
78 streamsize 
79 basic_streambuf<_CharT, _Traits>:: 
80 xsputn(const char_type* __s, streamsize __n) 
81 { 
82 streamsize __ret = 0; 
83 while (__ret < __n) 
84 { 
85 const streamsize __buf_len = this->epptr() - this->pptr(); 
86 if (__buf_len) 
87 { 
88 const streamsize __remaining = __n - __ret; 
89 const streamsize __len = std::min(a: __buf_len, b: __remaining); 
90 traits_type::copy(this->pptr(), __s, __len); 
91 __ret += __len; 
92 __s += __len; 
93 this->__safe_pbump(__len); 
94 } 
95 
96 if (__ret < __n) 
97 { 
98 int_type __c = this->overflow(traits_type::to_int_type(*__s)); 
99 if (!traits_type::eq_int_type(__c, traits_type::eof())) 
100 { 
101 ++__ret; 
102 ++__s; 
103 } 
104 else 
105 break; 
106 } 
107 } 
108 return __ret; 
109 } 
110 
111 // Conceivably, this could be used to implement buffer-to-buffer 
112 // copies, if this was ever desired in an un-ambiguous way by the 
113 // standard. 
114 template<typename _CharT, typename _Traits> 
115 streamsize 
116 __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin, 
117 basic_streambuf<_CharT, _Traits>* __sbout, 
118 bool& __ineof) 
119 { 
120 streamsize __ret = 0; 
121 __ineof = true; 
122 typename _Traits::int_type __c = __sbin->sgetc(); 
123 while (!_Traits::eq_int_type(__c, _Traits::eof())) 
124 { 
125 __c = __sbout->sputc(_Traits::to_char_type(__c)); 
126 if (_Traits::eq_int_type(__c, _Traits::eof())) 
127 { 
128 __ineof = false; 
129 break; 
130 } 
131 ++__ret; 
132 __c = __sbin->snextc(); 
133 } 
134 return __ret; 
135 } 
136 
137 template<typename _CharT, typename _Traits> 
138 inline streamsize 
139 __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin, 
140 basic_streambuf<_CharT, _Traits>* __sbout) 
141 { 
142 bool __ineof; 
143 return __copy_streambufs_eof(__sbin, __sbout, __ineof); 
144 } 
145 
146 // Inhibit implicit instantiations for required instantiations, 
147 // which are defined via explicit instantiations elsewhere. 
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_VERSION 
173} // namespace std 
174 
175#endif 
176