--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ossrv_pub/io_stream_api/inc/stdapis/stlport/stl/_streambuf.h Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,537 @@
+/*
+ * © Portions copyright (c) 2006-2007 Nokia Corporation. All rights reserved.
+ *
+ * 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.
+ // <ios_base> includes <iosfwd>.
+#endif
+
+#ifndef _STLP_STDIO_FILE_H
+#include <stl/_stdio_file.h> // Declaration of struct FILE, and of
+ // functions to manipulate it.
+#endif
+
+_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>
+#ifdef __SYMBIAN32__
+class basic_streambuf
+#else
+class basic_streambuf
+#endif
+{
+ 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.
+ _STLP_DECLSPEC virtual ~basic_streambuf();
+
+protected: // The default constructor.
+ _STLP_DECLSPEC basic_streambuf();
+
+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)
+ { 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.
+
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC virtual streamsize showmanyc();
+
+ // Reads up to __n characters. Return value is the number of
+ // characters read.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC virtual int_type underflow();
+
+ // Similar to underflow(), but used for unbuffered input. Most
+ // subclasses should probably override this virtual member function.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC 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.
+ _STLP_DECLSPEC virtual void imbue(const locale&);
+
+public: // Locale-related functions.
+ _STLP_DECLSPEC locale pubimbue(const locale&);
+ locale getloc() const { return _M_locale; }
+
+# ifndef _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
+};
+
+
+//----------------------------------------------------------------------
+// Specialization: basic_streambuf<char, char_traits<char> >
+
+// We implement basic_streambuf<char, char_traits<char> > very differently
+// than the general basic_streambuf<> template. The main reason for this
+// difference is a requirement in the C++ standard: the standard input
+// and output streams cin and cout are required by default to be synchronized
+// with the C library components stdin and stdout. This means it must be
+// possible to synchronize a basic_streambuf<char> with a C buffer.
+//
+// There are two basic ways to do that. First, the streambuf could be
+// unbuffered and delegate all buffering to stdio operations. This
+// would be correct, but slow: it would require at least one virtual
+// function call for every character. Second, the streambuf could use
+// a C stdio FILE as its buffer.
+//
+// We choose the latter option. Every streambuf has pointers to two
+// FILE objects, one for the get area and one for the put area. Ordinarily
+// it just uses a FILE object as a convenient way to package the three
+// get/put area pointers. If a basic_streambuf<char> is synchronized with
+// a stdio stream, though, then the pointers are to a FILE object that's
+// also used by the C library.
+//
+// The header <stl/_stdio_file.h> encapsulates the implementation details
+// of struct FILE. It contains low-level inline functions that convert
+// between whe FILE's internal representation and the three-pointer
+// representation that basic_streambuf<> needs.
+
+_STLP_TEMPLATE_NULL
+#ifdef __SYMBIAN32__
+class basic_streambuf<char, char_traits<char> >
+#else
+class _STLP_CLASS_DECLSPEC basic_streambuf<char, char_traits<char> >
+#endif
+{
+ friend class basic_istream<char, char_traits<char> >;
+ friend class basic_ostream<char, char_traits<char> >;
+public: // Typedefs.
+ typedef char char_type;
+ typedef char_traits<char>::int_type int_type;
+ typedef char_traits<char>::pos_type pos_type;
+ typedef char_traits<char>::off_type off_type;
+ typedef char_traits<char> traits_type;
+
+private: // Data members.
+
+ FILE* _M_get; // Reference to the get area
+ FILE* _M_put; // Reference to the put area
+
+#if defined(__hpux)
+ _FILEX _M_default_get; // Get area, unless we're syncing with stdio.
+ _FILEX _M_default_put; // Put area, unless we're syncing with stdio.
+#else
+ FILE _M_default_get; // Get area, unless we're syncing with stdio.
+ FILE _M_default_put; // Put area, unless we're syncing with stdio.
+#endif
+
+ locale _M_locale;
+
+public: // Extension: locking, for thread safety.
+ _STLP_mutex _M_lock;
+
+public: // Destructor.
+ _STLP_DECLSPEC virtual ~basic_streambuf _STLP_PSPEC2(char, char_traits<char>) ();
+
+public:
+ // The default constructor; defined here inline as some compilers require it
+ _STLP_DECLSPEC basic_streambuf _STLP_PSPEC2(char, char_traits<char>) ();
+ // Extension: a constructor for streambufs synchronized with C stdio files.
+ _STLP_DECLSPEC basic_streambuf _STLP_PSPEC2(char, char_traits<char>) (FILE* __get, FILE* __put);
+
+protected: // Protected interface to the get area.
+ char_type* eback() const { return _FILE_I_begin(_M_get); }
+ char_type* gptr() const { return _FILE_I_next(_M_get); }
+ char_type* egptr() const { return _FILE_I_end(_M_get); }
+ void gbump(int __n) { _FILE_I_bump(_M_get, __n); }
+ void setg(char_type* __gbegin, char_type* __gnext, char_type* __gend)
+ {
+ _FILE_I_set(_M_get, __gbegin, __gnext, __gend);
+#ifdef __SYMBIAN32__
+ _change_input_mode();
+#endif
+ }
+
+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 _FILE_I_begin(_M_get); }
+ char_type* _M_gptr() const { return _FILE_I_next(_M_get); }
+ char_type* _M_egptr() const { return _FILE_I_end(_M_get); }
+
+ void _M_gbump(int __n) { _FILE_I_bump(_M_get, __n); }
+ void _M_setg(char_type* __gbegin, char_type* __gnext, char_type* __gend)
+ { _FILE_I_set(_M_get, __gbegin, __gnext, __gend); }
+
+protected: // Protected interface to the put area
+ char_type* pbase() const { return _FILE_O_begin(_M_put); }
+ char_type* pptr() const { return _FILE_O_next(_M_put); }
+ char_type* epptr() const { return _FILE_O_end(_M_put); }
+
+ void pbump(int __n) { _FILE_O_bump(_M_put, __n); }
+ void setp(char_type* __pbegin, char_type* __pend)
+ { _FILE_O_set(_M_put, __pbegin, __pbegin, __pend); }
+
+protected: // Virtual buffer-management functions.
+ _STLP_DECLSPEC virtual basic_streambuf<char, char_traits<char> >* setbuf(char_type*, streamsize);
+ _STLP_DECLSPEC virtual pos_type seekoff(off_type, ios_base::seekdir,
+ ios_base::openmode = ios_base::in | ios_base::out);
+ _STLP_DECLSPEC virtual pos_type
+ seekpos(pos_type, ios_base::openmode = ios_base::in | ios_base::out);
+ _STLP_DECLSPEC virtual int sync();
+
+public: // Buffer management.
+ basic_streambuf<char, char_traits<char> >* 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.
+ _STLP_DECLSPEC virtual streamsize showmanyc();
+ _STLP_DECLSPEC virtual streamsize xsgetn(char_type* __s, streamsize __n);
+ _STLP_DECLSPEC virtual int_type underflow();
+ _STLP_DECLSPEC virtual int_type uflow();
+ _STLP_DECLSPEC virtual int_type pbackfail(int_type __c = traits_type::eof());
+
+protected: // Virtual put area functions.
+ _STLP_DECLSPEC virtual streamsize xsputn(const char_type* __s, streamsize __n);
+ _STLP_DECLSPEC virtual streamsize _M_xsputnc(char_type __c, streamsize __n);
+ _STLP_DECLSPEC virtual int_type overflow(int_type = traits_type::eof());
+#ifdef __SYMBIAN32__
+ virtual int save_read_buffer () { return 0; }
+ virtual void _change_input_mode() {};
+#endif
+public: // Public members for writing characters.
+ // Write a single character.
+ int_type sputc(char_type __c) {
+ int_type __res;
+ if( _FILE_O_avail(_M_put) > 0 )
+ {
+ _FILE_O_postincr(_M_put) = __c;
+ __res = traits_type::to_int_type(__c);
+ }
+ else
+ __res = this->overflow(traits_type::to_int_type(__c));
+ return __res;
+ }
+
+ // 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.
+ _STLP_DECLSPEC int_type _M_snextc_aux();
+
+public: // Public members for reading characters.
+ streamsize in_avail()
+ { return _FILE_I_avail(_M_get) > 0 ? _FILE_I_avail(_M_get)
+#ifdef __SYMBIAN32__
+ + save_read_buffer()
+#endif
+ : this->showmanyc(); }
+
+ // Advance to the next character and return it.
+ int_type snextc() {
+ return _FILE_I_avail(_M_get) > 1
+ ? traits_type::to_int_type(_FILE_I_preincr(_M_get))
+ : this->_M_snextc_aux();
+ }
+
+ // Return the current character and advance to the next.
+ int_type sbumpc() {
+ return _FILE_I_avail(_M_get) > 0
+ ? traits_type::to_int_type(_FILE_I_postincr(_M_get))
+ : this->uflow();
+ }
+
+ // Return the current character without advancing to the next.
+ int_type sgetc() {
+ return _FILE_I_avail(_M_get) > 0
+ ? traits_type::to_int_type(*_FILE_I_next(_M_get))
+ : this->underflow();
+ }
+
+ streamsize sgetn(char_type* __s, streamsize __n)
+ { return this->xsgetn(__s, __n); }
+
+ int_type sputbackc(char_type __c) {
+ return _FILE_I_begin(_M_get) < _FILE_I_next(_M_get) &&
+ __c == *(_FILE_I_next(_M_get) - 1)
+ ? traits_type::to_int_type(_FILE_I_predecr(_M_get))
+ : this->pbackfail(traits_type::to_int_type(__c));
+ }
+
+ int_type sungetc() {
+ return _FILE_I_begin(_M_get) < _FILE_I_next(_M_get)
+ ? traits_type::to_int_type(_FILE_I_predecr(_M_get))
+ : this->pbackfail();
+ }
+
+protected: // Virtual locale functions.
+ _STLP_DECLSPEC virtual void imbue(const locale&);
+public: // Locale-related functions.
+ _STLP_DECLSPEC locale pubimbue(const locale&);
+ locale getloc() const { return _M_locale; }
+
+# ifndef _STLP_NO_ANACHRONISMS
+public:
+ 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
+
+};
+_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: