X-Git-Url: http://git.buserror.net/cgi-bin/gitweb.cgi?p=polintos%2Fscott%2Fpriv.git;a=blobdiff_plain;f=include%2Fc%2B%2B%2Fstl%2Fstl%2F_streambuf.h;fp=include%2Fc%2B%2B%2Fstl%2Fstl%2F_streambuf.h;h=d6df0a75ac214a9a6c724aca8b1442cebed1d49f;hp=0000000000000000000000000000000000000000;hb=173d8903eb9d51a4ea7d7fa3e52dc86c9bb6d4f1;hpb=b024710fe2b60cd4a42a8993b61333d6cdb56ca3 diff --git a/include/c++/stl/stl/_streambuf.h b/include/c++/stl/stl/_streambuf.h new file mode 100644 index 0000000..d6df0a7 --- /dev/null +++ b/include/c++/stl/stl/_streambuf.h @@ -0,0 +1,301 @@ +/* + * Copyright (c) 1999 + * Silicon Graphics Computer Systems, Inc. + * + * Copyright (c) 1999 + * Boris Fomitchev + * + * This material is provided "as is", with absolutely no warranty expressed + * or implied. Any use is at your own risk. + * + * Permission to use or copy this software for any purpose is hereby granted + * without fee, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + * + */ +#ifndef _STLP_INTERNAL_STREAMBUF +#define _STLP_INTERNAL_STREAMBUF + +#ifndef _STLP_IOS_BASE_H +# include // Needed for ios_base bitfield members. +#endif // includes . + +_STLP_BEGIN_NAMESPACE + +//---------------------------------------------------------------------- +// Class basic_streambuf<>, the base class of the streambuf hierarchy. + +// A basic_streambuf<> manages an input (get) area and an output (put) +// area. Each is described by three pointers: a beginning, an end, and a +// current position. basic_streambuf<> contains some very simple member +// functions that manipulate those six pointers, but almost all of the real +// functionality gets delegated to protected virtual member functions. +// All of the public member functions are inline, and most of the protected +// member functions are virtual. + +// Although basic_streambuf<> is not abstract, it is useful only as a base +// class. Its virtual member functions have default definitions such that +// reading from a basic_streambuf<> will always yield EOF, and writing to a +// basic_streambuf<> will always fail. + +// The second template parameter, _Traits, defaults to char_traits<_CharT>. +// The default is declared in header , and it isn't declared here +// because C++ language rules do not allow it to be declared twice. + +template +class basic_streambuf { + friend class basic_istream<_CharT, _Traits>; + friend class basic_ostream<_CharT, _Traits>; + +public: // Typedefs. + typedef _CharT char_type; + typedef typename _Traits::int_type int_type; + typedef typename _Traits::pos_type pos_type; + typedef typename _Traits::off_type off_type; + typedef _Traits traits_type; + +private: // Data members. + + char_type* _M_gbegin; // Beginning of get area + char_type* _M_gnext; // Current position within the get area + char_type* _M_gend; // End of get area + + char_type* _M_pbegin; // Beginning of put area + char_type* _M_pnext; // Current position within the put area + char_type* _M_pend; // End of put area + + locale _M_locale; // The streambuf's locale object + +//public: // Extension: locking, for thread safety. +// _STLP_mutex _M_lock; + +public: // Destructor. + virtual ~basic_streambuf(); + +protected: // The default constructor. + basic_streambuf() +#if defined (_STLP_MSVC) && (_STLP_MSVC < 1300) && defined (_STLP_USE_STATIC_LIB) + //We make it inline to avoid unresolved symbol. + : _M_gbegin(0), _M_gnext(0), _M_gend(0), + _M_pbegin(0), _M_pnext(0), _M_pend(0), + _M_locale() + {} +#else + ; +#endif + +protected: // Protected interface to the get area. + char_type* eback() const { return _M_gbegin; } // Beginning + char_type* gptr() const { return _M_gnext; } // Current position + char_type* egptr() const { return _M_gend; } // End + + void gbump(int __n) { _M_gnext += __n; } + void setg(char_type* __gbegin, char_type* __gnext, char_type* __gend) { + _M_gbegin = __gbegin; + _M_gnext = __gnext; + _M_gend = __gend; + } + +public: + // An alternate public interface to the above functions + // which allows us to avoid using templated friends which + // are not supported on some compilers. + char_type* _M_eback() const { return eback(); } + char_type* _M_gptr() const { return gptr(); } + char_type* _M_egptr() const { return egptr(); } + void _M_gbump(int __n) { gbump(__n); } + void _M_setg(char_type* __gbegin, char_type* __gnext, char_type* __gend) + { this->setg(__gbegin, __gnext, __gend); } + +protected: // Protected interface to the put area + + char_type* pbase() const { return _M_pbegin; } // Beginning + char_type* pptr() const { return _M_pnext; } // Current position + char_type* epptr() const { return _M_pend; } // End + + void pbump(int __n) { _M_pnext += __n; } + void setp(char_type* __pbegin, char_type* __pend) { + _M_pbegin = __pbegin; + _M_pnext = __pbegin; + _M_pend = __pend; + } + +protected: // Virtual buffer management functions. + + virtual basic_streambuf<_CharT, _Traits>* setbuf(char_type*, streamsize); + + // Alters the stream position, using an integer offset. In this + // class seekoff does nothing; subclasses are expected to override it. + virtual pos_type seekoff(off_type, ios_base::seekdir, + ios_base::openmode = ios_base::in | ios_base::out); + + // Alters the stream position, using a previously obtained streampos. In + // this class seekpos does nothing; subclasses are expected to override it. + virtual pos_type + seekpos(pos_type, ios_base::openmode = ios_base::in | ios_base::out); + + // Synchronizes (i.e. flushes) the buffer. All subclasses are expected to + // override this virtual member function. + virtual int sync(); + + +public: // Buffer management. + basic_streambuf<_CharT, _Traits>* pubsetbuf(char_type* __s, streamsize __n) + { return this->setbuf(__s, __n); } + + pos_type pubseekoff(off_type __offset, ios_base::seekdir __way, + ios_base::openmode __mod = ios_base::in | ios_base::out) + { return this->seekoff(__offset, __way, __mod); } + + pos_type pubseekpos(pos_type __sp, + ios_base::openmode __mod = ios_base::in | ios_base::out) + { return this->seekpos(__sp, __mod); } + + int pubsync() { return this->sync(); } + +protected: // Virtual get area functions, as defined in + // 17.5.2.4.3 and 17.5.2.4.4 of the standard. + // Returns a lower bound on the number of characters that we can read, + // with underflow, before reaching end of file. (-1 is a special value: + // it means that underflow will fail.) Most subclasses should probably + // override this virtual member function. + virtual streamsize showmanyc(); + + // Reads up to __n characters. Return value is the number of + // characters read. + virtual streamsize xsgetn(char_type* __s, streamsize __n); + + // Called when there is no read position, i.e. when gptr() is null + // or when gptr() >= egptr(). Subclasses are expected to override + // this virtual member function. + virtual int_type underflow(); + + // Similar to underflow(), but used for unbuffered input. Most + // subclasses should probably override this virtual member function. + virtual int_type uflow(); + + // Called when there is no putback position, i.e. when gptr() is null + // or when gptr() == eback(). All subclasses are expected to override + // this virtual member function. + virtual int_type pbackfail(int_type = traits_type::eof()); + +protected: // Virtual put area functions, as defined in + // 27.5.2.4.5 of the standard. + + // Writes up to __n characters. Return value is the number of characters + // written. + virtual streamsize xsputn(const char_type* __s, streamsize __n); + + // Extension: writes up to __n copies of __c. Return value is the number + // of characters written. + virtual streamsize _M_xsputnc(char_type __c, streamsize __n); + + // Called when there is no write position. All subclasses are expected to + // override this virtual member function. + virtual int_type overflow(int_type = traits_type::eof()); + +public: // Public members for writing characters. + // Write a single character. + int_type sputc(char_type __c) { + return ((_M_pnext < _M_pend) ? _Traits::to_int_type(*_M_pnext++ = __c) + : this->overflow(_Traits::to_int_type(__c))); + } + + // Write __n characters. + streamsize sputn(const char_type* __s, streamsize __n) + { return this->xsputn(__s, __n); } + + // Extension: write __n copies of __c. + streamsize _M_sputnc(char_type __c, streamsize __n) + { return this->_M_xsputnc(__c, __n); } + +private: // Helper functions. + int_type _M_snextc_aux(); + +public: // Public members for reading characters. + streamsize in_avail() { + return (_M_gnext < _M_gend) ? (_M_gend - _M_gnext) : this->showmanyc(); + } + + // Advance to the next character and return it. + int_type snextc() { + return ( _M_gend - _M_gnext > 1 ? + _Traits::to_int_type(*++_M_gnext) : + this->_M_snextc_aux()); + } + + // Return the current character and advance to the next. + int_type sbumpc() { + return _M_gnext < _M_gend ? _Traits::to_int_type(*_M_gnext++) + : this->uflow(); + } + + // Return the current character without advancing to the next. + int_type sgetc() { + return _M_gnext < _M_gend ? _Traits::to_int_type(*_M_gnext) + : this->underflow(); + } + + streamsize sgetn(char_type* __s, streamsize __n) + { return this->xsgetn(__s, __n); } + + int_type sputbackc(char_type __c) { + return ((_M_gbegin < _M_gnext) && _Traits::eq(__c, *(_M_gnext - 1))) + ? _Traits::to_int_type(*--_M_gnext) + : this->pbackfail(_Traits::to_int_type(__c)); + } + + int_type sungetc() { + return (_M_gbegin < _M_gnext) + ? _Traits::to_int_type(*--_M_gnext) + : this->pbackfail(); + } + +protected: // Virtual locale functions. + + // This is a hook, called by pubimbue() just before pubimbue() + // sets the streambuf's locale to __loc. Note that imbue should + // not (and cannot, since it has no access to streambuf's private + // members) set the streambuf's locale itself. + virtual void imbue(const locale&); + +public: // Locale-related functions. + locale pubimbue(const locale&); + locale getloc() const { return _M_locale; } + +#if !defined (_STLP_NO_ANACHRONISMS) + void stossc() { this->sbumpc(); } +#endif +#if defined (__MVS__) || defined (__OS400__) +private: // Data members. + + char_type* _M_gbegin; // Beginning of get area + char_type* _M_gnext; // Current position within the get area + char_type* _M_gend; // End of get area + + char_type* _M_pbegin; // Beginning of put area + char_type* _M_pnext; // Current position within the put area + char_type* _M_pend; // End of put area +#endif +}; + +#if defined (_STLP_USE_TEMPLATE_EXPORT) +_STLP_EXPORT_TEMPLATE_CLASS basic_streambuf >; +# if !defined (_STLP_NO_WCHAR_T) +_STLP_EXPORT_TEMPLATE_CLASS basic_streambuf >; +# endif // _STLP_NO_WCHAR_T +#endif // _STLP_USE_TEMPLATE_EXPORT + +_STLP_END_NAMESPACE + +#if defined (_STLP_EXPOSE_STREAM_IMPLEMENTATION) && !defined (_STLP_LINK_TIME_INSTANTIATION) +# include +#endif + +#endif + +// Local Variables: +// mode:C++ +// End: