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Diffstat (limited to 'contrib/libstdc++/include/std/std_streambuf.h')
| -rw-r--r-- | contrib/libstdc++/include/std/std_streambuf.h | 496 |
1 files changed, 496 insertions, 0 deletions
diff --git a/contrib/libstdc++/include/std/std_streambuf.h b/contrib/libstdc++/include/std/std_streambuf.h new file mode 100644 index 0000000..012bf4e --- /dev/null +++ b/contrib/libstdc++/include/std/std_streambuf.h @@ -0,0 +1,496 @@ +// Stream buffer classes -*- C++ -*- + +// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 +// 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: 27.5 Stream buffers +// + +/** @file streambuf + * 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_STREAMBUF +#define _CPP_STREAMBUF 1 + +#pragma GCC system_header + +#include <bits/c++config.h> +#include <iosfwd> +#include <cstdio> // For SEEK_SET, SEEK_CUR, SEEK_END +#include <bits/localefwd.h> +#include <bits/ios_base.h> + +namespace std +{ + template<typename _CharT, typename _Traits> + streamsize + __copy_streambufs(basic_ios<_CharT, _Traits>& _ios, + basic_streambuf<_CharT, _Traits>* __sbin, + basic_streambuf<_CharT, _Traits>* __sbout); + + // 27.5.2 Template class basic_streambuf<_CharT, _Traits> + template<typename _CharT, typename _Traits> + class basic_streambuf + { + 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 ctype<char_type> __ctype_type; + typedef basic_streambuf<char_type, traits_type> __streambuf_type; + + friend class basic_ios<char_type, traits_type>; + friend class basic_istream<char_type, traits_type>; + friend class basic_ostream<char_type, traits_type>; + friend class istreambuf_iterator<char_type, traits_type>; + friend class ostreambuf_iterator<char_type, traits_type>; + + friend streamsize + __copy_streambufs<>(basic_ios<char_type, traits_type>& __ios, + __streambuf_type* __sbin,__streambuf_type* __sbout); + + protected: + // Pointer to the beginning of internally-allocated + // space. Filebuf manually allocates/deallocates this, whereas + // stringstreams attempt to use the built-in intelligence of the + // string class. If you are managing memory, set this. If not, + // leave it NULL. + char_type* _M_buf; + + // Actual size of allocated internal buffer, in bytes. + int_type _M_buf_size; + + // Optimal or preferred size of internal buffer, in bytes. + int_type _M_buf_size_opt; + + // True iff _M_in_* and _M_out_* buffers should always point to + // the same place. True for fstreams, false for sstreams. + bool _M_buf_unified; + + // This is based on _IO_FILE, just reordered to be more + // consistent, and is intended to be the most minimal abstraction + // for an internal buffer. + // get == input == read + // put == output == write + char_type* _M_in_beg; // Start of get area. + char_type* _M_in_cur; // Current read area. + char_type* _M_in_end; // End of get area. + char_type* _M_out_beg; // Start of put area. + char_type* _M_out_cur; // Current put area. + char_type* _M_out_end; // End of put area. + + // Place to stash in || out || in | out settings for current streambuf. + ios_base::openmode _M_mode; + + // Current locale setting. + locale _M_buf_locale; + + // True iff locale is initialized. + bool _M_buf_locale_init; + + // Necessary bits for putback buffer management. Only used in + // the basic_filebuf class, as necessary for the standard + // requirements. The only basic_streambuf member function that + // needs access to these data members is in_avail... + // NB: pbacks of over one character are not currently supported. + static const int_type _S_pback_size = 1; + char_type _M_pback[_S_pback_size]; + char_type* _M_pback_cur_save; + char_type* _M_pback_end_save; + bool _M_pback_init; + + // Initializes pback buffers, and moves normal buffers to safety. + // Assumptions: + // _M_in_cur has already been moved back + void + _M_pback_create() + { + if (!_M_pback_init) + { + int_type __dist = _M_in_end - _M_in_cur; + int_type __len = min(_S_pback_size, __dist); + traits_type::copy(_M_pback, _M_in_cur, __len); + _M_pback_cur_save = _M_in_cur; + _M_pback_end_save = _M_in_end; + this->setg(_M_pback, _M_pback, _M_pback + __len); + _M_pback_init = true; + } + } + + // Deactivates pback buffer contents, and restores normal buffer. + // Assumptions: + // The pback buffer has only moved forward. + void + _M_pback_destroy() + { + if (_M_pback_init) + { + // Length _M_in_cur moved in the pback buffer. + int_type __off_cur = _M_in_cur - _M_pback; + + // For in | out buffers, the end can be pushed back... + int_type __off_end = 0; + int_type __pback_len = _M_in_end - _M_pback; + int_type __save_len = _M_pback_end_save - _M_buf; + if (__pback_len > __save_len) + __off_end = __pback_len - __save_len; + + this->setg(_M_buf, _M_pback_cur_save + __off_cur, + _M_pback_end_save + __off_end); + _M_pback_cur_save = NULL; + _M_pback_end_save = NULL; + _M_pback_init = false; + } + } + + // Correctly sets the _M_in_cur pointer, and bumps the + // _M_out_cur pointer as well if necessary. + void + _M_in_cur_move(off_type __n) // argument needs to be +- + { + bool __testout = _M_out_cur; + _M_in_cur += __n; + if (__testout && _M_buf_unified) + _M_out_cur += __n; + } + + // Correctly sets the _M_out_cur pointer, and bumps the + // appropriate _M_*_end pointers as well. Necessary for the + // un-tied stringbufs, in in|out mode. + // Invariant: + // __n + _M_out_[cur, end] <= _M_buf + _M_buf_size + // Assuming all _M_*_[beg, cur, end] pointers are operating on + // the same range: + // _M_buf <= _M_*_ <= _M_buf + _M_buf_size + void + _M_out_cur_move(off_type __n) // argument needs to be +- + { + bool __testin = _M_in_cur; + + _M_out_cur += __n; + if (__testin && _M_buf_unified) + _M_in_cur += __n; + if (_M_out_cur > _M_out_end) + { + _M_out_end = _M_out_cur; + // NB: in | out buffers drag the _M_in_end pointer along... + if (__testin) + _M_in_end += __n; + } + } + + // Return the size of the output buffer. This depends on the + // buffer in use: allocated buffers have a stored size in + // _M_buf_size and setbuf() buffers don't. + off_type + _M_out_buf_size() + { + off_type __ret = 0; + if (_M_out_cur) + { + // Using allocated buffer. + if (_M_out_beg == _M_buf) + __ret = _M_out_beg + _M_buf_size - _M_out_cur; + // Using non-allocated buffer. + else + __ret = _M_out_end - _M_out_cur; + } + return __ret; + } + + public: + virtual + ~basic_streambuf() + { + _M_buf_unified = false; + _M_buf_size = 0; + _M_buf_size_opt = 0; + _M_mode = ios_base::openmode(0); + _M_buf_locale_init = false; + } + + // Locales: + locale + pubimbue(const locale &__loc) + { + locale __tmp(this->getloc()); + this->imbue(__loc); + return __tmp; + } + + locale + getloc() const + { + if (_M_buf_locale_init) + return _M_buf_locale; + else + return locale(); + } + + // Buffer and positioning: + __streambuf_type* + pubsetbuf(char_type* __s, streamsize __n) + { return this->setbuf(__s, __n); } + + pos_type + pubseekoff(off_type __off, ios_base::seekdir __way, + ios_base::openmode __mode = ios_base::in | ios_base::out) + { return this->seekoff(__off, __way, __mode); } + + pos_type + pubseekpos(pos_type __sp, + ios_base::openmode __mode = ios_base::in | ios_base::out) + { return this->seekpos(__sp, __mode); } + + int + pubsync() { return this->sync(); } + + // Get and put areas: + // Get area: + streamsize + in_avail() + { + streamsize __ret; + if (_M_in_cur && _M_in_cur < _M_in_end) + { + if (_M_pback_init) + { + int_type __save_len = _M_pback_end_save - _M_pback_cur_save; + int_type __pback_len = _M_in_cur - _M_pback; + __ret = __save_len - __pback_len; + } + else + __ret = this->egptr() - this->gptr(); + } + else + __ret = this->showmanyc(); + return __ret; + } + + int_type + snextc() + { + int_type __eof = traits_type::eof(); + return (this->sbumpc() == __eof ? __eof : this->sgetc()); + } + + int_type + sbumpc(); + + int_type + sgetc() + { + int_type __ret; + if (_M_in_cur && _M_in_cur < _M_in_end) + __ret = traits_type::to_int_type(*(this->gptr())); + else + __ret = this->underflow(); + return __ret; + } + + streamsize + sgetn(char_type* __s, streamsize __n) + { return this->xsgetn(__s, __n); } + + // Putback: + int_type + sputbackc(char_type __c); + + int_type + sungetc(); + + // Put area: + int_type + sputc(char_type __c); + + streamsize + sputn(const char_type* __s, streamsize __n) + { return this->xsputn(__s, __n); } + + protected: + basic_streambuf() + : _M_buf(NULL), _M_buf_size(0), + _M_buf_size_opt(static_cast<int_type>(BUFSIZ)), _M_buf_unified(false), + _M_in_beg(0), _M_in_cur(0), _M_in_end(0), _M_out_beg(0), _M_out_cur(0), + _M_out_end(0), _M_mode(ios_base::openmode(0)), _M_buf_locale(locale()), + _M_buf_locale_init(false), _M_pback_cur_save(0), _M_pback_end_save(0), + _M_pback_init(false) + { } + + // Get area: + char_type* + eback() const { return _M_in_beg; } + + char_type* + gptr() const { return _M_in_cur; } + + char_type* + egptr() const { return _M_in_end; } + + void + gbump(int __n) { _M_in_cur += __n; } + + void + setg(char_type* __gbeg, char_type* __gnext, char_type* __gend) + { + _M_in_beg = __gbeg; + _M_in_cur = __gnext; + _M_in_end = __gend; + if (!(_M_mode & ios_base::in) && __gbeg && __gnext && __gend) + _M_mode = _M_mode | ios_base::in; + } + + // Put area: + char_type* + pbase() const { return _M_out_beg; } + + char_type* + pptr() const { return _M_out_cur; } + + char_type* + epptr() const { return _M_out_end; } + + void + pbump(int __n) { _M_out_cur += __n; } + + void + setp(char_type* __pbeg, char_type* __pend) + { + _M_out_beg = _M_out_cur = __pbeg; + _M_out_end = __pend; + if (!(_M_mode & ios_base::out) && __pbeg && __pend) + _M_mode = _M_mode | ios_base::out; + } + + // Virtual functions: + // Locales: + virtual void + imbue(const locale& __loc) + { + _M_buf_locale_init = true; + if (_M_buf_locale != __loc) + _M_buf_locale = __loc; + } + + // Buffer management and positioning: + virtual basic_streambuf<char_type,_Traits>* + setbuf(char_type*, streamsize) + { return this; } + + virtual pos_type + seekoff(off_type, ios_base::seekdir, + ios_base::openmode /*__mode*/ = ios_base::in | ios_base::out) + { return pos_type(off_type(-1)); } + + virtual pos_type + seekpos(pos_type, + ios_base::openmode /*__mode*/ = ios_base::in | ios_base::out) + { return pos_type(off_type(-1)); } + + virtual int + sync() { return 0; } + + // Get area: + virtual streamsize + showmanyc() { return 0; } + + virtual streamsize + xsgetn(char_type* __s, streamsize __n); + + virtual int_type + underflow() + { return traits_type::eof(); } + + virtual int_type + uflow() + { + int_type __ret = traits_type::eof(); + bool __testeof = this->underflow() == __ret; + bool __testpending = _M_in_cur && _M_in_cur < _M_in_end; + if (!__testeof && __testpending) + { + __ret = traits_type::to_int_type(*_M_in_cur); + ++_M_in_cur; + if (_M_buf_unified && _M_mode & ios_base::out) + ++_M_out_cur; + } + return __ret; + } + + // Putback: + virtual int_type + pbackfail(int_type /* __c */ = traits_type::eof()) + { return traits_type::eof(); } + + // Put area: + virtual streamsize + xsputn(const char_type* __s, streamsize __n); + + virtual int_type + overflow(int_type /* __c */ = traits_type::eof()) + { return traits_type::eof(); } + +#ifdef _GLIBCPP_DEPRECATED + public: + void + stossc() + { + if (_M_in_cur < _M_in_end) + ++_M_in_cur; + else + this->uflow(); + } +#endif + +#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS + // Side effect of DR 50. + private: + basic_streambuf(const __streambuf_type&) { }; + + __streambuf_type& + operator=(const __streambuf_type&) { return *this; }; +#endif + }; +} // namespace std + +#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT +# define export +#endif +#ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS +#include <bits/streambuf.tcc> +#endif + +#endif |
