1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// File descriptor layer for filebuf -*- C++ -*-
// Copyright (C) 2002, 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file ext/stdio_filebuf.h
* This file is a GNU extension to the Standard C++ Library.
*/
#ifndef _STDIO_FILEBUF_H
#define _STDIO_FILEBUF_H 1
#pragma GCC system_header
#include <fstream>
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
/**
* @brief Provides a layer of compatibility for C/POSIX.
*
* This GNU extension provides extensions for working with standard C
* FILE*'s and POSIX file descriptors. It must be instantiated by the
* user with the type of character used in the file stream, e.g.,
* stdio_filebuf<char>.
*/
template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
class stdio_filebuf : public std::basic_filebuf<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
typedef std::size_t size_t;
public:
/**
* deferred initialization
*/
stdio_filebuf() : std::basic_filebuf<_CharT, _Traits>() {}
/**
* @param fd An open file descriptor.
* @param mode Same meaning as in a standard filebuf.
* @param size Optimal or preferred size of internal buffer, in chars.
*
* This constructor associates a file stream buffer with an open
* POSIX file descriptor. The file descriptor will be automatically
* closed when the stdio_filebuf is closed/destroyed.
*/
stdio_filebuf(int __fd, std::ios_base::openmode __mode,
size_t __size = static_cast<size_t>(BUFSIZ));
/**
* @param f An open @c FILE*.
* @param mode Same meaning as in a standard filebuf.
* @param size Optimal or preferred size of internal buffer, in chars.
* Defaults to system's @c BUFSIZ.
*
* This constructor associates a file stream buffer with an open
* C @c FILE*. The @c FILE* will not be automatically closed when the
* stdio_filebuf is closed/destroyed.
*/
stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
size_t __size = static_cast<size_t>(BUFSIZ));
/**
* Closes the external data stream if the file descriptor constructor
* was used.
*/
virtual
~stdio_filebuf();
/**
* @return The underlying file descriptor.
*
* Once associated with an external data stream, this function can be
* used to access the underlying POSIX file descriptor. Note that
* there is no way for the library to track what you do with the
* descriptor, so be careful.
*/
int
fd() { return this->_M_file.fd(); }
/**
* @return The underlying FILE*.
*
* This function can be used to access the underlying "C" file pointer.
* Note that there is no way for the library to track what you do
* with the file, so be careful.
*/
std::__c_file*
file() { return this->_M_file.file(); }
};
template<typename _CharT, typename _Traits>
stdio_filebuf<_CharT, _Traits>::~stdio_filebuf()
{ }
template<typename _CharT, typename _Traits>
stdio_filebuf<_CharT, _Traits>::
stdio_filebuf(int __fd, std::ios_base::openmode __mode, size_t __size)
{
this->_M_file.sys_open(__fd, __mode);
if (this->is_open())
{
this->_M_mode = __mode;
this->_M_buf_size = __size;
this->_M_allocate_internal_buffer();
this->_M_reading = false;
this->_M_writing = false;
this->_M_set_buffer(-1);
}
}
template<typename _CharT, typename _Traits>
stdio_filebuf<_CharT, _Traits>::
stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
size_t __size)
{
this->_M_file.sys_open(__f, __mode);
if (this->is_open())
{
this->_M_mode = __mode;
this->_M_buf_size = __size;
this->_M_allocate_internal_buffer();
this->_M_reading = false;
this->_M_writing = false;
this->_M_set_buffer(-1);
}
}
_GLIBCXX_END_NAMESPACE
#endif
|
