// File based streams -*- C++ -*- // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 // 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, 51 Franklin Street, Fifth Floor, // Boston, MA 02110-1301, 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. /** @file fstream * This is a Standard C++ Library header. */ // // ISO C++ 14882: 27.8 File-based streams // #ifndef _GLIBCXX_FSTREAM #define _GLIBCXX_FSTREAM 1 #pragma GCC system_header #include #include #include // For codecvt #include // For SEEK_SET, SEEK_CUR, SEEK_END, BUFSIZ #include #include _GLIBCXX_BEGIN_NAMESPACE(std) // [27.8.1.1] template class basic_filebuf /** * @brief The actual work of input and output (for files). * * This class associates both its input and output sequence with an * external disk file, and maintains a joint file position for both * sequences. Many of its sematics are described in terms of similar * behavior in the Standard C Library's @c FILE streams. */ // Requirements on traits_type, specific to this class: // traits_type::pos_type must be fpos // traits_type::off_type must be streamoff // traits_type::state_type must be Assignable and DefaultConstructable, // and traits_type::state_type() must be the initial state for codecvt. template 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; typedef basic_streambuf __streambuf_type; typedef basic_filebuf __filebuf_type; typedef __basic_file __file_type; typedef typename traits_type::state_type __state_type; typedef codecvt __codecvt_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; /** * @if maint * Place to stash in || out || in | out settings for current filebuf. * @endif */ ios_base::openmode _M_mode; // Beginning state type for codecvt. __state_type _M_state_beg; // During output, the state that corresponds to pptr(), // during input, the state that corresponds to egptr() and // _M_ext_next. __state_type _M_state_cur; // Not used for output. During input, the state that corresponds // to eback() and _M_ext_buf. __state_type _M_state_last; /** * @if maint * Pointer to the beginning of internal buffer. * @endif */ char_type* _M_buf; /** * @if maint * Actual size of internal buffer. This number is equal to the size * of the put area + 1 position, reserved for the overflow char of * a full area. * @endif */ size_t _M_buf_size; // Set iff _M_buf is allocated memory from _M_allocate_internal_buffer. bool _M_buf_allocated; /** * @if maint * _M_reading == false && _M_writing == false for 'uncommitted' mode; * _M_reading == true for 'read' mode; * _M_writing == true for 'write' mode; * * NB: _M_reading == true && _M_writing == true is unused. * @endif */ bool _M_reading; bool _M_writing; //@{ /** * @if maint * Necessary bits for putback buffer management. * * @note pbacks of over one character are not currently supported. * @endif */ char_type _M_pback; char_type* _M_pback_cur_save; char_type* _M_pback_end_save; bool _M_pback_init; //@} // Cached codecvt facet. const __codecvt_type* _M_codecvt; /** * @if maint * Buffer for external characters. Used for input when * codecvt::always_noconv() == false. When valid, this corresponds * to eback(). * @endif */ char* _M_ext_buf; /** * @if maint * Size of buffer held by _M_ext_buf. * @endif */ streamsize _M_ext_buf_size; /** * @if maint * Pointers into the buffer held by _M_ext_buf that delimit a * subsequence of bytes that have been read but not yet converted. * When valid, _M_ext_next corresponds to egptr(). * @endif */ const char* _M_ext_next; char* _M_ext_end; /** * @if maint * Initializes pback buffers, and moves normal buffers to safety. * Assumptions: * _M_in_cur has already been moved back * @endif */ void _M_create_pback() { if (!_M_pback_init) { _M_pback_cur_save = this->gptr(); _M_pback_end_save = this->egptr(); this->setg(&_M_pback, &_M_pback, &_M_pback + 1); _M_pback_init = true; } } /** * @if maint * Deactivates pback buffer contents, and restores normal buffer. * Assumptions: * The pback buffer has only moved forward. * @endif */ void _M_destroy_pback() throw() { if (_M_pback_init) { // Length _M_in_cur moved in the pback buffer. _M_pback_cur_save += this->gptr() != this->eback(); this->setg(_M_buf, _M_pback_cur_save, _M_pback_end_save); _M_pback_init = false; } } public: // Constructors/destructor: /** * @brief Does not open any files. * * The default constructor initializes the parent class using its * own default ctor. */ basic_filebuf(); /** * @brief The destructor closes the file first. */ virtual ~basic_filebuf() { this->close(); } // Members: /** * @brief Returns true if the external file is open. */ bool is_open() const throw() { return _M_file.is_open(); } /** * @brief Opens an external file. * @param s The name of the file. * @param mode The open mode flags. * @return @c this on success, NULL on failure * * If a file is already open, this function immediately fails. * Otherwise it tries to open the file named @a s using the flags * given in @a mode. * * [Table 92 gives the relation between openmode combinations and the * equivalent fopen() flags, but the table has not been copied yet.] */ __filebuf_type* open(const char* __s, ios_base::openmode __mode); /** * @brief Closes the currently associated file. * @return @c this on success, NULL on failure * * If no file is currently open, this function immediately fails. * * If a "put buffer area" exists, @c overflow(eof) is called to flush * all the characters. The file is then closed. * * If any operations fail, this function also fails. */ __filebuf_type* close() throw(); protected: void _M_allocate_internal_buffer(); void _M_destroy_internal_buffer() throw(); // [27.8.1.4] 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() virtual int_type underflow(); virtual int_type pbackfail(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. virtual int_type overflow(int_type __c = _Traits::eof()); // Convert internal byte sequence to external, char-based // sequence via codecvt. bool _M_convert_to_external(char_type*, streamsize); /** * @brief Manipulates the buffer. * @param s Pointer to a buffer area. * @param n Size of @a s. * @return @c this * * If no file has been opened, and both @a s and @a n are zero, then * the stream becomes unbuffered. Otherwise, @c s is used as a * buffer; see * http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 * for more. */ 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); // Common code for seekoff and seekpos pos_type _M_seek(off_type __off, ios_base::seekdir __way, __state_type __state); virtual int sync(); virtual void imbue(const locale& __loc); virtual streamsize xsgetn(char_type* __s, streamsize __n); virtual streamsize xsputn(const char_type* __s, streamsize __n); // Flushes output buffer, then writes unshift sequence. bool _M_terminate_output(); /** * @if maint * This function sets the pointers of the internal buffer, both get * and put areas. Typically: * * __off == egptr() - eback() upon underflow/uflow ('read' mode); * __off == 0 upon overflow ('write' mode); * __off == -1 upon open, setbuf, seekoff/pos ('uncommitted' mode). * * NB: epptr() - pbase() == _M_buf_size - 1, since _M_buf_size * reflects the actual allocated memory and the last cell is reserved * for the overflow char of a full put area. * @endif */ void _M_set_buffer(streamsize __off) { const bool __testin = _M_mode & ios_base::in; const bool __testout = _M_mode & ios_base::out; if (__testin && __off > 0) this->setg(_M_buf, _M_buf, _M_buf + __off); else this->setg(_M_buf, _M_buf, _M_buf); if (__testout && __off == 0 && _M_buf_size > 1 ) this->setp(_M_buf, _M_buf + _M_buf_size - 1); else this->setp(NULL, NULL); } }; // [27.8.1.5] Template class basic_ifstream /** * @brief Controlling input for files. * * This class supports reading from named files, using the inherited * functions from std::basic_istream. To control the associated * sequence, an instance of std::basic_filebuf is used, which this page * refers to as @c sb. */ template 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 __filebuf_type; typedef basic_istream __istream_type; private: __filebuf_type _M_filebuf; public: // Constructors/Destructors: /** * @brief Default constructor. * * Initializes @c sb using its default constructor, and passes * @c &sb to the base class initializer. Does not open any files * (you haven't given it a filename to open). */ basic_ifstream() : __istream_type(), _M_filebuf() { this->init(&_M_filebuf); } /** * @brief Create an input file stream. * @param s Null terminated string specifying the filename. * @param mode Open file in specified mode (see std::ios_base). * * @c ios_base::in is automatically included in @a mode. * * 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(), _M_filebuf() { this->init(&_M_filebuf); this->open(__s, __mode); } /** * @brief The destructor does nothing. * * The file is closed by the filebuf object, not the formatting * stream. */ ~basic_ifstream() { } // Members: /** * @brief Accessing the underlying buffer. * @return The current basic_filebuf buffer. * * This hides both signatures of std::basic_ios::rdbuf(). */ __filebuf_type* rdbuf() const { return const_cast<__filebuf_type*>(&_M_filebuf); } /** * @brief Wrapper to test for an open file. * @return @c rdbuf()->is_open() */ bool is_open() { return _M_filebuf.is_open(); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 365. Lack of const-qualification in clause 27 bool is_open() const { return _M_filebuf.is_open(); } /** * @brief Opens an external file. * @param s The name of the file. * @param mode The open mode flags. * * Calls @c std::basic_filebuf::open(s,mode|in). If that function * fails, @c failbit is set in the stream's error state. * * 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) { if (!_M_filebuf.open(__s, __mode | ios_base::in)) this->setstate(ios_base::failbit); else // _GLIBCXX_RESOLVE_LIB_DEFECTS // 409. Closing an fstream should clear error state this->clear(); } /** * @brief Close the file. * * Calls @c std::basic_filebuf::close(). If that function * fails, @c failbit is set in the stream's error state. */ void close() { if (!_M_filebuf.close()) this->setstate(ios_base::failbit); } }; // [27.8.1.8] Template class basic_ofstream /** * @brief Controlling output for files. * * This class supports reading from named files, using the inherited * functions from std::basic_ostream. To control the associated * sequence, an instance of std::basic_filebuf is used, which this page * refers to as @c sb. */ template 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 __filebuf_type; typedef basic_ostream __ostream_type; private: __filebuf_type _M_filebuf; public: // Constructors: /** * @brief Default constructor. * * Initializes @c sb using its default constructor, and passes * @c &sb to the base class initializer. Does not open any files * (you haven't given it a filename to open). */ basic_ofstream(): __ostream_type(), _M_filebuf() { this->init(&_M_filebuf); } /** * @brief Create an output file stream. * @param s Null terminated string specifying the filename. * @param mode Open file in specified mode (see std::ios_base). * * @c ios_base::out|ios_base::trunc is automatically included in * @a mode. * * 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(), _M_filebuf() { this->init(&_M_filebuf); this->open(__s, __mode); } /** * @brief The destructor does nothing. * * The file is closed by the filebuf object, not the formatting * stream. */ ~basic_ofstream() { } // Members: /** * @brief Accessing the underlying buffer. * @return The current basic_filebuf buffer. * * This hides both signatures of std::basic_ios::rdbuf(). */ __filebuf_type* rdbuf() const { return const_cast<__filebuf_type*>(&_M_filebuf); } /** * @brief Wrapper to test for an open file. * @return @c rdbuf()->is_open() */ bool is_open() { return _M_filebuf.is_open(); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 365. Lack of const-qualification in clause 27 bool is_open() const { return _M_filebuf.is_open(); } /** * @brief Opens an external file. * @param s The name of the file. * @param mode The open mode flags. * * Calls @c std::basic_filebuf::open(s,mode|out|trunc). If that * function fails, @c failbit is set in the stream's error state. * * 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); else // _GLIBCXX_RESOLVE_LIB_DEFECTS // 409. Closing an fstream should clear error state this->clear(); } /** * @brief Close the file. * * Calls @c std::basic_filebuf::close(). If that function * fails, @c failbit is set in the stream's error state. */ void close() { if (!_M_filebuf.close()) this->setstate(ios_base::failbit); } }; // [27.8.1.11] Template class basic_fstream /** * @brief Controlling intput and output for files. * * This class supports reading from and writing to named files, using * the inherited functions from std::basic_iostream. To control the * associated sequence, an instance of std::basic_filebuf is used, which * this page refers to as @c sb. */ template 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 __filebuf_type; typedef basic_ios __ios_type; typedef basic_iostream __iostream_type; private: __filebuf_type _M_filebuf; public: // Constructors/destructor: /** * @brief Default constructor. * * Initializes @c sb using its default constructor, and passes * @c &sb to the base class initializer. Does not open any files * (you haven't given it a filename to open). */ basic_fstream() : __iostream_type(), _M_filebuf() { this->init(&_M_filebuf); } /** * @brief Create an input/output file stream. * @param s Null terminated string specifying the 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); } /** * @brief The destructor does nothing. * * The file is closed by the filebuf object, not the formatting * stream. */ ~basic_fstream() { } // Members: /** * @brief Accessing the underlying buffer. * @return The current basic_filebuf buffer. * * This hides both signatures of std::basic_ios::rdbuf(). */ __filebuf_type* rdbuf() const { return const_cast<__filebuf_type*>(&_M_filebuf); } /** * @brief Wrapper to test for an open file. * @return @c rdbuf()->is_open() */ bool is_open() { return _M_filebuf.is_open(); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 365. Lack of const-qualification in clause 27 bool is_open() const { return _M_filebuf.is_open(); } /** * @brief Opens an external file. * @param s The name of the file. * @param mode The open mode flags. * * Calls @c std::basic_filebuf::open(s,mode). If that * function fails, @c failbit is set in the stream's error state. * * 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)) this->setstate(ios_base::failbit); else // _GLIBCXX_RESOLVE_LIB_DEFECTS // 409. Closing an fstream should clear error state this->clear(); } /** * @brief Close the file. * * Calls @c std::basic_filebuf::close(). If that function * fails, @c failbit is set in the stream's error state. */ void close() { if (!_M_filebuf.close()) this->setstate(ios_base::failbit); } }; _GLIBCXX_END_NAMESPACE #ifndef _GLIBCXX_EXPORT_TEMPLATE # include #endif #endif /* _GLIBCXX_FSTREAM */