1// Stream buffer classes -*- C++ -*-
2
3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
4// 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 2, 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// You should have received a copy of the GNU General Public License along
18// with this library; see the file COPYING.  If not, write to the Free
19// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
20// USA.
21
22// As a special exception, you may use this file as part of a free software
23// library without restriction.  Specifically, if other files instantiate
24// templates or use macros or inline functions from this file, or you compile
25// this file and link it with other files to produce an executable, this
26// file does not by itself cause the resulting executable to be covered by
27// the GNU General Public License.  This exception does not however
28// invalidate any other reasons why the executable file might be covered by
29// the GNU General Public License.
30
31/** @file streambuf.tcc
32 *  This is an internal header file, included by other library headers.
33 *  You should not attempt to use it directly.
34 */
35
36//
37// ISO C++ 14882: 27.5  Stream buffers
38//
39
40#ifndef _STREAMBUF_TCC
41#define _STREAMBUF_TCC 1
42
43#pragma GCC system_header
44
45_GLIBCXX_BEGIN_NAMESPACE(std)
46
47  template<typename _CharT, typename _Traits>
48    streamsize
49    basic_streambuf<_CharT, _Traits>::
50    xsgetn(char_type* __s, streamsize __n)
51    {
52      streamsize __ret = 0;
53      while (__ret < __n)
54	{
55	  const streamsize __buf_len = this->egptr() - this->gptr();
56	  if (__buf_len)
57	    {
58	      const streamsize __remaining = __n - __ret;
59	      const streamsize __len = std::min(__buf_len, __remaining);
60	      traits_type::copy(__s, this->gptr(), __len);
61	      __ret += __len;
62	      __s += __len;
63	      this->gbump(__len);
64	    }
65
66	  if (__ret < __n)
67	    {
68	      const int_type __c = this->uflow();
69	      if (!traits_type::eq_int_type(__c, traits_type::eof()))
70		{
71		  traits_type::assign(*__s++, traits_type::to_char_type(__c));
72		  ++__ret;
73		}
74	      else
75		break;
76	    }
77	}
78      return __ret;
79    }
80
81  template<typename _CharT, typename _Traits>
82    streamsize
83    basic_streambuf<_CharT, _Traits>::
84    xsputn(const char_type* __s, streamsize __n)
85    {
86      streamsize __ret = 0;
87      while (__ret < __n)
88	{
89	  const streamsize __buf_len = this->epptr() - this->pptr();
90	  if (__buf_len)
91	    {
92	      const streamsize __remaining = __n - __ret;
93	      const streamsize __len = std::min(__buf_len, __remaining);
94	      traits_type::copy(this->pptr(), __s, __len);
95	      __ret += __len;
96	      __s += __len;
97	      this->pbump(__len);
98	    }
99
100	  if (__ret < __n)
101	    {
102	      int_type __c = this->overflow(traits_type::to_int_type(*__s));
103	      if (!traits_type::eq_int_type(__c, traits_type::eof()))
104		{
105		  ++__ret;
106		  ++__s;
107		}
108	      else
109		break;
110	    }
111	}
112      return __ret;
113    }
114
115  // Conceivably, this could be used to implement buffer-to-buffer
116  // copies, if this was ever desired in an un-ambiguous way by the
117  // standard.
118  template<typename _CharT, typename _Traits>
119    streamsize
120    __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin,
121			  basic_streambuf<_CharT, _Traits>* __sbout,
122			  bool& __ineof)
123    {
124      streamsize __ret = 0;
125      __ineof = true;
126      typename _Traits::int_type __c = __sbin->sgetc();
127      while (!_Traits::eq_int_type(__c, _Traits::eof()))
128	{
129	  __c = __sbout->sputc(_Traits::to_char_type(__c));
130	  if (_Traits::eq_int_type(__c, _Traits::eof()))
131	    {
132	      __ineof = false;
133	      break;
134	    }
135	  ++__ret;
136	  __c = __sbin->snextc();
137	}
138      return __ret;
139    }
140
141  template<typename _CharT, typename _Traits>
142    inline streamsize
143    __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin,
144		      basic_streambuf<_CharT, _Traits>* __sbout)
145    {
146      bool __ineof;
147      return __copy_streambufs_eof(__sbin, __sbout, __ineof);
148    }
149
150  // Inhibit implicit instantiations for required instantiations,
151  // which are defined via explicit instantiations elsewhere.
152  // NB:  This syntax is a GNU extension.
153#if _GLIBCXX_EXTERN_TEMPLATE
154  extern template class basic_streambuf<char>;
155  extern template
156    streamsize
157    __copy_streambufs(basic_streambuf<char>*,
158		      basic_streambuf<char>*);
159  extern template
160    streamsize
161    __copy_streambufs_eof(basic_streambuf<char>*,
162			  basic_streambuf<char>*, bool&);
163
164#ifdef _GLIBCXX_USE_WCHAR_T
165  extern template class basic_streambuf<wchar_t>;
166  extern template
167    streamsize
168    __copy_streambufs(basic_streambuf<wchar_t>*,
169		      basic_streambuf<wchar_t>*);
170  extern template
171    streamsize
172    __copy_streambufs_eof(basic_streambuf<wchar_t>*,
173			  basic_streambuf<wchar_t>*, bool&);
174#endif
175#endif
176
177_GLIBCXX_END_NAMESPACE
178
179#endif
180