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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
|
// Wrapper of C-language FILE struct -*- C++ -*-
// Copyright (C) 2000, 2001, 2002, 2004 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 2, 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 27.8 File-based streams
//
#include <bits/basic_file.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef _GLIBCPP_HAVE_SYS_IOCTL_H
#define BSD_COMP /* Get FIONREAD on Solaris2. */
#include <sys/ioctl.h>
#endif
// Pick up FIONREAD on Solaris 2.5.
#ifdef _GLIBCPP_HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#ifdef _GLIBCPP_HAVE_POLL
#include <poll.h>
#endif
#if defined(_GLIBCPP_HAVE_S_ISREG) || defined(_GLIBCPP_HAVE_S_IFREG)
# include <sys/stat.h>
# ifdef _GLIBCPP_HAVE_S_ISREG
# define _GLIBCPP_ISREG(x) S_ISREG(x)
# else
# define _GLIBCPP_ISREG(x) (((x) & S_IFMT) == S_IFREG)
# endif
#endif
namespace __gnu_internal
{
// Map ios_base::openmode flags to a string for use in fopen().
// Table of valid combinations as given in [lib.filebuf.members]/2.
static const char*
fopen_mode(std::ios_base::openmode mode)
{
enum
{
in = std::ios_base::in,
out = std::ios_base::out,
trunc = std::ios_base::trunc,
app = std::ios_base::app,
binary = std::ios_base::binary
};
switch (mode & (in|out|trunc|app|binary))
{
case ( out ): return "w";
case ( out |app ): return "a";
case ( out|trunc ): return "w";
case (in ): return "r";
case (in|out ): return "r+";
case (in|out|trunc ): return "w+";
case ( out |binary): return "wb";
case ( out |app|binary): return "ab";
case ( out|trunc |binary): return "wb";
case (in |binary): return "rb";
case (in|out |binary): return "r+b";
case (in|out|trunc |binary): return "w+b";
default: return 0; // invalid
}
}
} // namespace __gnu_internal
namespace std
{
// Definitions for __basic_file<char>.
__basic_file<char>::__basic_file(__c_lock* /*__lock*/)
: _M_cfile(NULL), _M_cfile_created(false) { }
__basic_file<char>::~__basic_file()
{ this->close(); }
// Preserved for binary compatibility only.
// Do not use. Gone in 3.4.
void
__basic_file<char>::_M_open_mode(ios_base::openmode __mode, int&, int&,
char* __c_mode)
{
const char* r = __gnu_internal::fopen_mode(__mode);
if (r)
strcpy(__c_mode, r);
}
__basic_file<char>*
__basic_file<char>::sys_open(__c_file* __file, ios_base::openmode)
{
__basic_file* __ret = NULL;
if (!this->is_open() && __file)
{
_M_cfile = __file;
_M_cfile_created = false;
__ret = this;
}
return __ret;
}
__basic_file<char>*
__basic_file<char>::sys_open(int __fd, ios_base::openmode __mode,
bool __del)
{
__basic_file* __ret = NULL;
const char* __c_mode = __gnu_internal::fopen_mode(__mode);
if (__c_mode && !this->is_open()
&& (_M_cfile = fdopen(__fd, __c_mode)))
{
// Iff __del is true, then close will fclose the fd.
_M_cfile_created = __del;
if (__fd == 0)
setvbuf(_M_cfile, reinterpret_cast<char*>(NULL), _IONBF, 0);
__ret = this;
}
return __ret;
}
int
__basic_file<char>::sys_getc()
{ return getc(_M_cfile); }
int
__basic_file<char>::sys_ungetc(int __c)
{ return ungetc(__c, _M_cfile); }
__basic_file<char>*
__basic_file<char>::open(const char* __name, ios_base::openmode __mode,
int /*__prot*/)
{
__basic_file* __ret = NULL;
const char* __c_mode = __gnu_internal::fopen_mode(__mode);
if (__c_mode && !this->is_open())
{
if ((_M_cfile = fopen(__name, __c_mode)))
{
_M_cfile_created = true;
__ret = this;
}
}
return __ret;
}
bool
__basic_file<char>::is_open() const
{ return _M_cfile != 0; }
int
__basic_file<char>::fd()
{ return fileno(_M_cfile) ; }
__basic_file<char>*
__basic_file<char>::close()
{
__basic_file* __retval = static_cast<__basic_file*>(NULL);
if (this->is_open())
{
if (_M_cfile_created)
fclose(_M_cfile);
else
fflush(_M_cfile);
_M_cfile = 0;
__retval = this;
}
return __retval;
}
streamsize
__basic_file<char>::xsgetn(char* __s, streamsize __n)
{ return fread(__s, 1, __n, _M_cfile); }
streamsize
__basic_file<char>::xsputn(const char* __s, streamsize __n)
{ return fwrite(__s, 1, __n, _M_cfile); }
streamoff
__basic_file<char>::seekoff(streamoff __off, ios_base::seekdir __way,
ios_base::openmode /*__mode*/)
{
if (!fseek(_M_cfile, __off, __way))
return ftell(_M_cfile);
else
// Fseek failed.
return -1L;
}
streamoff
__basic_file<char>::seekpos(streamoff __pos, ios_base::openmode /*__mode*/)
{
if (!fseek(_M_cfile, __pos, ios_base::beg))
return ftell(_M_cfile);
else
// Fseek failed.
return -1L;
}
int
__basic_file<char>::sync()
{ return fflush(_M_cfile); }
streamsize
__basic_file<char>::showmanyc_helper()
{
#ifdef FIONREAD
// Pipes and sockets.
int __num = 0;
int __r = ioctl(this->fd(), FIONREAD, &__num);
if (!__r && __num >= 0)
return __num;
#endif
#ifdef _GLIBCPP_HAVE_POLL
// Cheap test.
struct pollfd __pfd[1];
__pfd[0].fd = this->fd();
__pfd[0].events = POLLIN;
if (poll(__pfd, 1, 0) <= 0)
return 0;
#endif
#if defined(_GLIBCPP_HAVE_S_ISREG) || defined(_GLIBCPP_HAVE_S_IFREG)
// Regular files.
struct stat __buffer;
int __ret = fstat(this->fd(), &__buffer);
if (!__ret && _GLIBCPP_ISREG(__buffer.st_mode))
return __buffer.st_size - ftell(_M_cfile);
#endif
return 0;
}
} // namespace std
|
