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1 | // Stream buffer classes -*- C++ -*- | |
2 | ||
3 | // Copyright (C) 1997-2014 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 |