1 | // Stream buffer classes -*- C++ -*- |
2 | |
3 | // Copyright (C) 1997-2019 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 | |