/home/ntakagi/work/STLport-5.1.5/src/stdio_streambuf.h Go to the documentation of this file. /* * 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. * */ // This header is an extension. It defines two streambufs: // stdio_istreambuf, a read-only streambuf synchronized with a C stdio // FILE object, and stdio_ostreambuf, a write-only streambuf // synchronized with a C stdio FILE object. Note that neither // stdio_istreambuf nor stdio_ostreambuf is a template; both classes // are derived from basic_streambuf<char, char_traits<char> >. // Note: the imbue() member function is a no-op. In particular, these // classes assume that codecvt<char, char, mbstate_t> is always an identity // transformation. This is true of the default locale, and of all locales // defined for the C I/O library. If you need to use a locale where // the codecvt<char, char, mbstate_t> facet performs a nontrivial // conversion, then you should use basic_filebuf<> instead of stdio_istreambuf // or stdio_ostreambuf. (If you don't understand what any of this means, // then it's not a feature you need to worry about. Locales where // codecvt<char, char, mbstate_t> does something nontrivial are a rare // corner case.) #ifndef _STLP_STDIO_STREAMBUF #define _STLP_STDIO_STREAMBUF #include <streambuf> #include <cstdio> // For FILE. _STLP_BEGIN_NAMESPACE _STLP_MOVE_TO_PRIV_NAMESPACE // Base class for features common to stdio_istreambuf and stdio_ostreambuf class stdio_streambuf_base : public basic_streambuf<char, char_traits<char> > /* FILE_basic_streambuf */ { public: // Constructor, destructor. // The argument may not be null. It must be an open file pointer. stdio_streambuf_base(FILE*); // The destructor flushes the stream, but does not close it. ~stdio_streambuf_base(); protected: // Virtual functions from basic_streambuf. streambuf* setbuf(char*, streamsize); pos_type seekoff(off_type, ios_base::seekdir, ios_base::openmode = ios_base::in | ios_base::out); pos_type seekpos(pos_type, ios_base::openmode = ios_base::in | ios_base::out); int sync(); protected: FILE* _M_file; }; class stdio_istreambuf : public stdio_streambuf_base { public: // Constructor, destructor. stdio_istreambuf(FILE* __f) : stdio_streambuf_base(__f) {} ~stdio_istreambuf(); protected: // Virtual functions from basic_streambuf. streamsize showmanyc(); int_type underflow(); int_type uflow(); virtual int_type pbackfail(int_type c = traits_type::eof()); }; class stdio_ostreambuf : public stdio_streambuf_base { public: // Constructor, destructor. stdio_ostreambuf(FILE* __f) : stdio_streambuf_base(__f) {} ~stdio_ostreambuf(); protected: // Virtual functions from basic_streambuf. streamsize showmanyc(); int_type overflow(int_type c = traits_type::eof()); }; _STLP_MOVE_TO_STD_NAMESPACE _STLP_END_NAMESPACE #endif /* _STLP_STDIO_STREAMBUF */ // Local Variables: // mode:C++ // End:

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