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