+++ /dev/null
-// File based streams -*- C++ -*-
-
-// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
-// 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
-//
-
-/** @file fstream
- * This is a Standard C++ Library header. You should @c #include this header
- * in your programs, rather than any of the "st[dl]_*.h" implementation files.
- */
-
-#ifndef _CPP_FSTREAM
-#define _CPP_FSTREAM 1
-
-#pragma GCC system_header
-
-#include <istream>
-#include <ostream>
-#include <locale> // For codecvt
-#include <bits/basic_file.h>
-#include <bits/gthr.h>
-
-namespace std
-{
- template<typename _CharT, typename _Traits>
- class basic_filebuf : public basic_streambuf<_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;
-
- // Non-standard Types:
- typedef basic_streambuf<char_type, traits_type> __streambuf_type;
- typedef basic_filebuf<char_type, traits_type> __filebuf_type;
- typedef __basic_file<char> __file_type;
- typedef typename traits_type::state_type __state_type;
- typedef codecvt<char_type, char, __state_type> __codecvt_type;
- typedef typename __codecvt_type::result __res_type;
- typedef ctype<char_type> __ctype_type;
-
- friend class ios_base; // For sync_with_stdio.
-
- protected:
- // Data Members:
- // MT lock inherited from libio or other low-level io library.
- __c_lock _M_lock;
-
- // External buffer.
- __file_type _M_file;
-
- // Current and beginning state type for codecvt.
- __state_type _M_state_cur;
- __state_type _M_state_beg;
-
- // Set iff _M_buf is allocated memory from _M_allocate_internal_buffer.
- bool _M_buf_allocated;
-
- // XXX Needed?
- bool _M_last_overflowed;
-
- // The position in the buffer corresponding to the external file
- // pointer.
- char_type* _M_filepos;
-
- public:
- // Constructors/destructor:
- basic_filebuf();
-
- virtual
- ~basic_filebuf()
- {
- this->close();
- _M_last_overflowed = false;
- }
-
- // Members:
- bool
- is_open() const { return _M_file.is_open(); }
-
- __filebuf_type*
- open(const char* __s, ios_base::openmode __mode);
-
- __filebuf_type*
- close();
-
- protected:
- void
- _M_allocate_internal_buffer();
-
- void
- _M_destroy_internal_buffer();
-
- // Overridden virtual functions:
- virtual streamsize
- showmanyc();
-
- // Stroustrup, 1998, p. 628
- // underflow() and uflow() functions are called to get the next
- // charater from the real input source when the buffer is empty.
- // Buffered input uses underflow()
-
- // The only difference between underflow() and uflow() is that the
- // latter bumps _M_in_cur after the read. In the sync_with_stdio
- // case, this is important, as we need to unget the read character in
- // the underflow() case in order to maintain synchronization. So
- // instead of calling underflow() from uflow(), we create a common
- // subroutine to do the real work.
- int_type
- _M_underflow_common(bool __bump);
-
- virtual int_type
- underflow();
-
- virtual int_type
- uflow();
-
- virtual int_type
- pbackfail(int_type __c = _Traits::eof());
-
- // NB: For what the standard expects of the overflow function,
- // see _M_really_overflow(), below. Because basic_streambuf's
- // sputc/sputn call overflow directly, and the complications of
- // this implementation's setting of the initial pointers all
- // equal to _M_buf when initializing, it seems essential to have
- // this in actuality be a helper function that checks for the
- // eccentricities of this implementation, and then call
- // overflow() if indeed the buffer is full.
- virtual int_type
- overflow(int_type __c = _Traits::eof());
-
- // Stroustrup, 1998, p 648
- // The overflow() function is called to transfer characters to the
- // real output destination when the buffer is full. A call to
- // overflow(c) outputs the contents of the buffer plus the
- // character c.
- // 27.5.2.4.5
- // Consume some sequence of the characters in the pending sequence.
- int_type
- _M_really_overflow(int_type __c = _Traits::eof());
-
- // Convert internal byte sequence to external, char-based
- // sequence via codecvt.
- void
- _M_convert_to_external(char_type*, streamsize, streamsize&, streamsize&);
-
- virtual __streambuf_type*
- setbuf(char_type* __s, streamsize __n);
-
- virtual pos_type
- seekoff(off_type __off, ios_base::seekdir __way,
- ios_base::openmode __mode = ios_base::in | ios_base::out);
-
- virtual pos_type
- seekpos(pos_type __pos,
- ios_base::openmode __mode = ios_base::in | ios_base::out);
-
- virtual int
- sync()
- {
- bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
-
- // Make sure that the internal buffer resyncs its idea of
- // the file position with the external file.
- if (__testput)
- {
- // Need to restore current position after the write.
- off_type __off = _M_out_cur - _M_out_end;
- _M_really_overflow(); // _M_file.sync() will be called within
- if (__off)
- _M_file.seekoff(__off, ios_base::cur);
- }
- else
- _M_file.sync();
- _M_last_overflowed = false;
- return 0;
- }
-
- virtual void
- imbue(const locale& __loc);
-
- virtual streamsize
- xsgetn(char_type* __s, streamsize __n)
- {
- streamsize __ret = 0;
- // Clear out pback buffer before going on to the real deal...
- if (_M_pback_init)
- {
- while (__ret < __n && _M_in_cur < _M_in_end)
- {
- *__s = *_M_in_cur;
- ++__ret;
- ++__s;
- ++_M_in_cur;
- }
- _M_pback_destroy();
- }
- if (__ret < __n)
- __ret += __streambuf_type::xsgetn(__s, __n - __ret);
- return __ret;
- }
-
- virtual streamsize
- xsputn(const char_type* __s, streamsize __n)
- {
- _M_pback_destroy();
- return __streambuf_type::xsputn(__s, __n);
- }
-
- void
- _M_output_unshift();
-
- // These three functions are used to clarify internal buffer
- // maintenance. After an overflow, or after a seekoff call that
- // started at beg or end, or possibly when the stream becomes
- // unbuffered, and a myrid other obscure corner cases, the
- // internal buffer does not truly reflect the contents of the
- // external buffer. At this point, for whatever reason, it is in
- // an indeterminate state.
- void
- _M_set_indeterminate(void)
- {
- if (_M_mode & ios_base::in)
- this->setg(_M_buf, _M_buf, _M_buf);
- if (_M_mode & ios_base::out)
- this->setp(_M_buf, _M_buf);
- _M_filepos = _M_buf;
- }
-
- void
- _M_set_determinate(off_type __off)
- {
- bool __testin = _M_mode & ios_base::in;
- bool __testout = _M_mode & ios_base::out;
- if (__testin)
- this->setg(_M_buf, _M_buf, _M_buf + __off);
- if (__testout)
- this->setp(_M_buf, _M_buf + __off);
- _M_filepos = _M_buf + __off;
- }
-
- bool
- _M_is_indeterminate(void)
- {
- bool __ret = false;
- // Don't return true if unbuffered.
- if (_M_buf)
- {
- if (_M_mode & ios_base::in)
- __ret = _M_in_beg == _M_in_cur && _M_in_cur == _M_in_end;
- if (_M_mode & ios_base::out)
- __ret = _M_out_beg == _M_out_cur && _M_out_cur == _M_out_end;
- }
- return __ret;
- }
- };
-
- // Explicit specializations.
- template<>
- basic_filebuf<char>::int_type
- basic_filebuf<char>::_M_underflow_common(bool __bump);
-
- #ifdef _GLIBCPP_USE_WCHAR_T
- template<>
- basic_filebuf<wchar_t>::int_type
- basic_filebuf<wchar_t>::_M_underflow_common(bool __bump);
- #endif
-
- // Generic definitions.
- template <typename _CharT, typename _Traits>
- basic_filebuf<_CharT, _Traits>::int_type
- basic_filebuf<_CharT, _Traits>::underflow()
- { return _M_underflow_common(false); }
-
- template <typename _CharT, typename _Traits>
- basic_filebuf<_CharT, _Traits>::int_type
- basic_filebuf<_CharT, _Traits>::uflow()
- { return _M_underflow_common(true); }
-
-
- // 27.8.1.5 Template class basic_ifstream
- /**
- * Derivation of general input streams, specific to files.
- */
- template<typename _CharT, typename _Traits>
- class basic_ifstream : public basic_istream<_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;
-
- // Non-standard types:
- typedef basic_filebuf<char_type, traits_type> __filebuf_type;
- typedef basic_istream<char_type, traits_type> __istream_type;
-
- private:
- __filebuf_type _M_filebuf;
-
- public:
- // Constructors/Destructors:
- /** Default constructor. Create an input file stream. */
- basic_ifstream()
- : __istream_type(NULL), _M_filebuf()
- { this->init(&_M_filebuf); }
-
- /**
- * @brief Create an input file stream.
- * @param s Null terminated string specifying filename.
- * @param mode Open file in specified mode (see std::ios_base).
- *
- * Tip: When using std::string to hold the filename, you must use
- * .c_str() before passing it to this constructor.
- */
- explicit
- basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in)
- : __istream_type(NULL), _M_filebuf()
- {
- this->init(&_M_filebuf);
- this->open(__s, __mode);
- }
-
- ~basic_ifstream()
- { }
-
- // Members:
- /**
- * @brief Get a pointer to the file stream's buffer.
- * @return Pointer to basic_filebuf.
- */
- __filebuf_type*
- rdbuf() const
- { return const_cast<__filebuf_type*>(&_M_filebuf); }
-
- bool
- is_open() { return _M_filebuf.is_open(); }
-
- void
- open(const char* __s, ios_base::openmode __mode = ios_base::in)
- {
- if (!_M_filebuf.open(__s, __mode | ios_base::in))
- this->setstate(ios_base::failbit);
- }
-
- /** Close the file. */
- void
- close()
- {
- if (!_M_filebuf.close())
- this->setstate(ios_base::failbit);
- }
- };
-
-
- // 27.8.1.8 Template class basic_ofstream
- /**
- * Derivation of general output streams, specific to files.
- */
- template<typename _CharT, typename _Traits>
- class basic_ofstream : public basic_ostream<_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;
-
- // Non-standard types:
- typedef basic_filebuf<char_type, traits_type> __filebuf_type;
- typedef basic_ostream<char_type, traits_type> __ostream_type;
-
- private:
- __filebuf_type _M_filebuf;
-
- public:
- // Constructors:
- /** Default constructor for output file_stream. */
- basic_ofstream()
- : __ostream_type(NULL), _M_filebuf()
- { this->init(&_M_filebuf); }
-
- /**
- * @brief Create an output stream.
- * @param s Null terminated string specifying filename.
- * @param mode Open file in specified mode (see std::ios_base).
- *
- * Tip: When using std::string to hold the filename, you must use
- * .c_str() before passing it to this constructor.
- */
- explicit
- basic_ofstream(const char* __s,
- ios_base::openmode __mode = ios_base::out|ios_base::trunc)
- : __ostream_type(NULL), _M_filebuf()
- {
- this->init(&_M_filebuf);
- this->open(__s, __mode);
- }
-
- ~basic_ofstream()
- { }
-
- // Members:
- /**
- * @brief Get a pointer to the file stream's buffer.
- * @return Pointer to basic_filebuf.
- */
- __filebuf_type*
- rdbuf() const
- { return const_cast<__filebuf_type*>(&_M_filebuf); }
-
- /**
- * @brief Query to see if file stream is open.
- * @return True if stream is open.
- */
- bool
- is_open() { return _M_filebuf.is_open(); }
-
- /**
- * @brief Specify a file to open for output.
- * @param s Null terminated string specifying filename.
- * @param mode Mode in which to open file (see std::ios_base).
- *
- * Tip: When using std::string to hold the filename, you must use
- * .c_str() before passing it to this constructor.
- */
- void
- open(const char* __s,
- ios_base::openmode __mode = ios_base::out | ios_base::trunc)
- {
- if (!_M_filebuf.open(__s, __mode | ios_base::out))
- this->setstate(ios_base::failbit);
- }
-
- /** Close the file stream. */
- void
- close()
- {
- if (!_M_filebuf.close())
- this->setstate(ios_base::failbit);
- }
- };
-
-
- // 27.8.1.11 Template class basic_fstream
- /**
- * Derivation of general input/output streams, specific to files.
- */
- template<typename _CharT, typename _Traits>
- class basic_fstream : public basic_iostream<_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;
-
- // Non-standard types:
- typedef basic_filebuf<char_type, traits_type> __filebuf_type;
- typedef basic_ios<char_type, traits_type> __ios_type;
- typedef basic_iostream<char_type, traits_type> __iostream_type;
-
- private:
- __filebuf_type _M_filebuf;
-
- public:
- // Constructors/destructor:
- /** Default constructor. Create a file stream. */
- basic_fstream()
- : __iostream_type(NULL), _M_filebuf()
- { this->init(&_M_filebuf); }
-
- /**
- * @brief Create an input/output stream.
- * @param s Null terminated string specifying filename.
- * @param mode Open file in specified mode (see std::ios_base).
- *
- * Tip: When using std::string to hold the filename, you must use
- * .c_str() before passing it to this constructor.
- */
- explicit
- basic_fstream(const char* __s,
- ios_base::openmode __mode = ios_base::in | ios_base::out)
- : __iostream_type(NULL), _M_filebuf()
- {
- this->init(&_M_filebuf);
- this->open(__s, __mode);
- }
-
- ~basic_fstream()
- { }
-
- // Members:
- /**
- * @brief Get a pointer to the file stream's buffer.
- * @return Pointer to basic_filebuf.
- */
- __filebuf_type*
- rdbuf() const
- { return const_cast<__filebuf_type*>(&_M_filebuf); }
-
- /**
- * @brief Query to see if file stream is open.
- * @return True if stream is open.
- */
- bool
- is_open() { return _M_filebuf.is_open(); }
-
- /**
- * @brief Specify a file to open for input and/or output.
- * @param s Null terminated string specifying filename.
- * @param mode Mode in which to open file (see std::ios_base).
- *
- * Tip: When using std::string to hold the filename, you must use
- * .c_str() before passing it to this constructor.
- */
- void
- open(const char* __s,
- ios_base::openmode __mode = ios_base::in | ios_base::out)
- {
- if (!_M_filebuf.open(__s, __mode))
- setstate(ios_base::failbit);
- }
-
- /** Close the file stream. */
- void
- close()
- {
- if (!_M_filebuf.close())
- setstate(ios_base::failbit);
- }
- };
-} // namespace std
-
-#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
-# define export
-#endif
-#ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS
-# include <bits/fstream.tcc>
-#endif
-
-#endif
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