--- /dev/null
+/*
+ * 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 <stl/_ios_base.h> // Needed for ios_base bitfield members.
+#endif // <ios_base> includes <iosfwd>.
+
+_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 <iosfwd>, and it isn't declared here
+// because C++ language rules do not allow it to be declared twice.
+
+template <class _CharT, class _Traits>
+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<char, char_traits<char> >;
+# if !defined (_STLP_NO_WCHAR_T)
+_STLP_EXPORT_TEMPLATE_CLASS basic_streambuf<wchar_t, char_traits<wchar_t> >;
+# 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 <stl/_streambuf.c>
+#endif
+
+#endif
+
+// Local Variables:
+// mode:C++
+// End:
projects / polintos / scott / priv.git / blobdiff