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STLPORT/stlport/stdio_streambuf

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+/*
+ * 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
+
+#if !defined(STLP_WINCE)
+
+#include <streambuf>            // For basic_streambuf<>
+#include <cstdio>              // For FILE.
+
+# ifndef _STLP_HAS_NO_NAMESPACES
+// This is an extension.  It is in namespace SGI, not namespace std
+namespace _SgI {
+
+# ifdef _STLP_USE_NAMESPACES
+using namespace _STLP_STD;
+  // MSVC needs this
+using _STLP_STD::streamsize;
+using _STLP_STD::streambuf;
+using _STLP_STD::basic_streambuf;
+using _STLP_STD::ios_base;
+  // using _STLP_STD::ios_base::openmode;
+# endif
+# endif
+
+// Base class for features common to stdio_istreambuf and stdio_ostreambuf
+class stdio_streambuf_base : public basic_streambuf<char, _STLP_STD::char_traits<char> >
+{
+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());
+};
+
+# ifndef _STLP_HAS_NO_NAMESPACES
+} // Close namespace _SgI.
+# endif
+
+#endif /* _STLP_STDIO_STREAMBUF */
+
+#endif /* _STLP_WINCE */
+
+// Local Variables:
+// mode:C++
+// End:
+