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