streambuf.tcc source code [include/c++/7/bits/streambuf.tcc]

1	// Stream buffer classes -- C++ --
2
3	// Copyright (C) 1997-2017 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
39	namespace 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(__buf_len, __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(__buf_len, __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

std::basic_streambuf::xsgetn

std::basic_streambuf::xsputn

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