1 // Wrapper of C-language FILE struct -*- C++ -*-
3 // Copyright (C) 2000, 2001, 2002, 2003, 2004, 2006, 2007
4 // Free Software Foundation, Inc.
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)
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.
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,
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.
32 // ISO C++ 14882: 27.8 File-based streams
35 #include <bits/basic_file.h>
39 #ifdef _GLIBCXX_HAVE_POLL
43 // Pick up ioctl on Solaris 2.8
44 #ifdef _GLIBCXX_HAVE_UNISTD_H
48 // Pick up FIONREAD on Solaris 2
49 #ifdef _GLIBCXX_HAVE_SYS_IOCTL_H
51 #include <sys/ioctl.h>
54 // Pick up FIONREAD on Solaris 2.5.
55 #ifdef _GLIBCXX_HAVE_SYS_FILIO_H
56 #include <sys/filio.h>
59 #ifdef _GLIBCXX_HAVE_SYS_UIO_H
63 #if defined(_GLIBCXX_HAVE_S_ISREG) || defined(_GLIBCXX_HAVE_S_IFREG)
64 # include <sys/stat.h>
65 # ifdef _GLIBCXX_HAVE_S_ISREG
66 # define _GLIBCXX_ISREG(x) S_ISREG(x)
68 # define _GLIBCXX_ISREG(x) (((x) & S_IFMT) == S_IFREG)
72 #include <limits> // For <off_t>::max() and min() and <streamsize>::max()
76 // Map ios_base::openmode flags to a string for use in fopen().
77 // Table of valid combinations as given in [lib.filebuf.members]/2.
79 fopen_mode(std::ios_base::openmode mode)
83 in = std::ios_base::in,
84 out = std::ios_base::out,
85 trunc = std::ios_base::trunc,
86 app = std::ios_base::app,
87 binary = std::ios_base::binary
90 // _GLIBCXX_RESOLVE_LIB_DEFECTS
91 // 596. 27.8.1.3 Table 112 omits "a+" and "a+b" modes.
92 switch (mode & (in|out|trunc|app|binary))
94 case ( out ): return "w";
95 case ( out |app ): return "a";
96 case ( app ): return "a";
97 case ( out|trunc ): return "w";
98 case (in ): return "r";
99 case (in|out ): return "r+";
100 case (in|out|trunc ): return "w+";
101 case (in|out |app ): return "a+";
102 case (in |app ): return "a+";
104 case ( out |binary): return "wb";
105 case ( out |app|binary): return "ab";
106 case ( app|binary): return "ab";
107 case ( out|trunc |binary): return "wb";
108 case (in |binary): return "rb";
109 case (in|out |binary): return "r+b";
110 case (in|out|trunc |binary): return "w+b";
111 case (in|out |app|binary): return "a+b";
112 case (in |app|binary): return "a+b";
114 default: return 0; // invalid
118 // Wrapper handling partial write.
119 static std::streamsize
120 xwrite(int __fd, const char* __s, std::streamsize __n)
122 std::streamsize __nleft = __n;
126 const std::streamsize __ret = write(__fd, __s, __nleft);
127 if (__ret == -1L && errno == EINTR)
139 return __n - __nleft;
142 #ifdef _GLIBCXX_HAVE_WRITEV
143 // Wrapper handling partial writev.
144 static std::streamsize
145 xwritev(int __fd, const char* __s1, std::streamsize __n1,
146 const char* __s2, std::streamsize __n2)
148 std::streamsize __nleft = __n1 + __n2;
149 std::streamsize __n1_left = __n1;
151 struct iovec __iov[2];
152 __iov[1].iov_base = const_cast<char*>(__s2);
153 __iov[1].iov_len = __n2;
157 __iov[0].iov_base = const_cast<char*>(__s1);
158 __iov[0].iov_len = __n1_left;
160 const std::streamsize __ret = writev(__fd, __iov, 2);
161 if (__ret == -1L && errno == EINTR)
170 const std::streamsize __off = __ret - __n1_left;
173 __nleft -= xwrite(__fd, __s2 + __off, __n2 - __off);
181 return __n1 + __n2 - __nleft;
184 } // anonymous namespace
187 _GLIBCXX_BEGIN_NAMESPACE(std)
189 // Definitions for __basic_file<char>.
190 __basic_file<char>::__basic_file(__c_lock* /*__lock*/)
191 : _M_cfile(NULL), _M_cfile_created(false) { }
193 __basic_file<char>::~__basic_file()
197 __basic_file<char>::sys_open(__c_file* __file, ios_base::openmode)
199 __basic_file* __ret = NULL;
200 if (!this->is_open() && __file)
205 __err = this->sync();
206 while (__err && errno == EINTR);
210 _M_cfile_created = false;
218 __basic_file<char>::sys_open(int __fd, ios_base::openmode __mode)
220 __basic_file* __ret = NULL;
221 const char* __c_mode = fopen_mode(__mode);
222 if (__c_mode && !this->is_open() && (_M_cfile = fdopen(__fd, __c_mode)))
225 _M_cfile_created = true;
227 setvbuf(_M_cfile, __buf, _IONBF, 0);
234 __basic_file<char>::open(const char* __name, ios_base::openmode __mode,
237 __basic_file* __ret = NULL;
238 const char* __c_mode = fopen_mode(__mode);
239 if (__c_mode && !this->is_open())
241 #ifdef _GLIBCXX_USE_LFS
242 if ((_M_cfile = fopen64(__name, __c_mode)))
244 if ((_M_cfile = fopen(__name, __c_mode)))
247 _M_cfile_created = true;
255 __basic_file<char>::is_open() const
256 { return _M_cfile != 0; }
259 __basic_file<char>::fd()
260 { return fileno(_M_cfile); }
263 __basic_file<char>::file()
267 __basic_file<char>::close()
269 __basic_file* __ret = static_cast<__basic_file*>(NULL);
273 if (_M_cfile_created)
275 // In general, no need to zero errno in advance if checking
276 // for error first. However, C89/C99 (at variance with IEEE
277 // 1003.1, f.i.) do not mandate that fclose must set errno
281 __err = fclose(_M_cfile);
282 while (__err && errno == EINTR);
292 __basic_file<char>::xsgetn(char* __s, streamsize __n)
296 __ret = read(this->fd(), __s, __n);
297 while (__ret == -1L && errno == EINTR);
302 __basic_file<char>::xsputn(const char* __s, streamsize __n)
303 { return xwrite(this->fd(), __s, __n); }
306 __basic_file<char>::xsputn_2(const char* __s1, streamsize __n1,
307 const char* __s2, streamsize __n2)
309 streamsize __ret = 0;
310 #ifdef _GLIBCXX_HAVE_WRITEV
311 __ret = xwritev(this->fd(), __s1, __n1, __s2, __n2);
314 __ret = xwrite(this->fd(), __s1, __n1);
317 __ret += xwrite(this->fd(), __s2, __n2);
323 __basic_file<char>::seekoff(streamoff __off, ios_base::seekdir __way)
325 #ifdef _GLIBCXX_USE_LFS
326 return lseek64(this->fd(), __off, __way);
328 if (__off > numeric_limits<off_t>::max()
329 || __off < numeric_limits<off_t>::min())
331 return lseek(this->fd(), __off, __way);
336 __basic_file<char>::sync()
337 { return fflush(_M_cfile); }
340 __basic_file<char>::showmanyc()
343 // Pipes and sockets.
344 #ifdef _GLIBCXX_FIONREAD_TAKES_OFF_T
349 int __r = ioctl(this->fd(), FIONREAD, &__num);
350 if (!__r && __num >= 0)
354 #ifdef _GLIBCXX_HAVE_POLL
356 struct pollfd __pfd[1];
357 __pfd[0].fd = this->fd();
358 __pfd[0].events = POLLIN;
359 if (poll(__pfd, 1, 0) <= 0)
363 #if defined(_GLIBCXX_HAVE_S_ISREG) || defined(_GLIBCXX_HAVE_S_IFREG)
365 #ifdef _GLIBCXX_USE_LFS
366 struct stat64 __buffer;
367 const int __err = fstat64(this->fd(), &__buffer);
368 if (!__err && _GLIBCXX_ISREG(__buffer.st_mode))
370 const streamoff __off = __buffer.st_size - lseek64(this->fd(), 0,
372 return std::min(__off, streamoff(numeric_limits<streamsize>::max()));
375 struct stat __buffer;
376 const int __err = fstat(this->fd(), &__buffer);
377 if (!__err && _GLIBCXX_ISREG(__buffer.st_mode))
378 return __buffer.st_size - lseek(this->fd(), 0, ios_base::cur);
384 _GLIBCXX_END_NAMESPACE