sl@0: /*
sl@0:  * Copyright (c) 1999
sl@0:  * Silicon Graphics Computer Systems, Inc.
sl@0:  *
sl@0:  * Copyright (c) 1999
sl@0:  * Boris Fomitchev
sl@0:  *
sl@0:  * This material is provided "as is", with absolutely no warranty expressed
sl@0:  * or implied. Any use is at your own risk.
sl@0:  *
sl@0:  * Permission to use or copy this software for any purpose is hereby granted
sl@0:  * without fee, provided the above notices are retained on all copies.
sl@0:  * Permission to modify the code and to distribute modified code is granted,
sl@0:  * provided the above notices are retained, and a notice that the code was
sl@0:  * modified is included with the above copyright notice.
sl@0:  *
sl@0:  */
sl@0: 
sl@0: // This header is an extension.  It defines two streambufs:
sl@0: // stdio_istreambuf, a read-only streambuf synchronized with a C stdio
sl@0: // FILE object, and stdio_ostreambuf, a write-only streambuf
sl@0: // synchronized with a C stdio FILE object.  Note that neither
sl@0: // stdio_istreambuf nor stdio_ostreambuf is a template; both classes
sl@0: // are derived from basic_streambuf<char, char_traits<char> >.
sl@0: 
sl@0: // Note: the imbue() member function is a no-op.  In particular, these
sl@0: // classes assume that codecvt<char, char, mbstate_t> is always an identity
sl@0: // transformation.  This is true of the default locale, and of all locales
sl@0: // defined for the C I/O library.  If you need to use a locale where
sl@0: // the codecvt<char, char, mbstate_t> facet performs a nontrivial
sl@0: // conversion, then you should use basic_filebuf<> instead of stdio_istreambuf
sl@0: // or stdio_ostreambuf.  (If you don't understand what any of this means,
sl@0: // then it's not a feature you need to worry about.  Locales where
sl@0: // codecvt<char, char, mbstate_t> does something nontrivial are a rare
sl@0: // corner case.)
sl@0: 
sl@0: 
sl@0: #ifndef _STLP_STDIO_STREAMBUF
sl@0: #define _STLP_STDIO_STREAMBUF
sl@0: 
sl@0: #include <streambuf>
sl@0: #include <cstdio>              // For FILE.
sl@0: 
sl@0: _STLP_BEGIN_NAMESPACE
sl@0: _STLP_MOVE_TO_PRIV_NAMESPACE
sl@0: 
sl@0: // Base class for features common to stdio_istreambuf and stdio_ostreambuf
sl@0: class stdio_streambuf_base :
sl@0:   public basic_streambuf<char, char_traits<char> > /* FILE_basic_streambuf */ {
sl@0: public:                         // Constructor, destructor.
sl@0:   // The argument may not be null.  It must be an open file pointer.
sl@0:   stdio_streambuf_base(FILE*);
sl@0: 
sl@0:   // The destructor flushes the stream, but does not close it.
sl@0:   ~stdio_streambuf_base();
sl@0: 
sl@0: protected:                      // Virtual functions from basic_streambuf.
sl@0:   streambuf* setbuf(char*, streamsize);
sl@0: 
sl@0:   pos_type seekoff(off_type, ios_base::seekdir,
sl@0:                    ios_base::openmode
sl@0:                           = ios_base::in | ios_base::out);
sl@0:   pos_type seekpos(pos_type,
sl@0:                    ios_base::openmode
sl@0:                           = ios_base::in | ios_base::out);
sl@0:   int sync();
sl@0: 
sl@0: protected:
sl@0:   FILE* _M_file;
sl@0: };
sl@0: 
sl@0: class stdio_istreambuf : public stdio_streambuf_base {
sl@0: public:                         // Constructor, destructor.
sl@0:   stdio_istreambuf(FILE* __f) : stdio_streambuf_base(__f) {}
sl@0:   ~stdio_istreambuf();
sl@0: 
sl@0: protected:                      // Virtual functions from basic_streambuf.
sl@0:   streamsize showmanyc();
sl@0:   int_type underflow();
sl@0:   int_type uflow();
sl@0:   virtual int_type pbackfail(int_type c = traits_type::eof());
sl@0: };
sl@0: 
sl@0: class stdio_ostreambuf : public stdio_streambuf_base {
sl@0: public:                         // Constructor, destructor.
sl@0:   stdio_ostreambuf(FILE* __f) : stdio_streambuf_base(__f) {}
sl@0:   ~stdio_ostreambuf();
sl@0: 
sl@0: protected:                      // Virtual functions from basic_streambuf.
sl@0:   streamsize showmanyc();
sl@0:   int_type overflow(int_type c = traits_type::eof());
sl@0: };
sl@0: 
sl@0: _STLP_MOVE_TO_STD_NAMESPACE
sl@0: _STLP_END_NAMESPACE
sl@0: 
sl@0: #endif /* _STLP_STDIO_STREAMBUF */
sl@0: 
sl@0: // Local Variables:
sl@0: // mode:C++
sl@0: // End: