From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Fri, 12 Oct 2007 21:24:11 +0000 (+0000)
Subject: Added comedi::istream and ostream classes, to provide slightly higher
X-Git-Tag: r0_8_1~9
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=b6144ac99b7ccecdf984fdd4dae1ac7cf196cd59;p=comedilib.git

Added comedi::istream and ostream classes, to provide slightly higher
level ostream::write() and istream::read() functions for transferring
data during commands.
---

diff --git a/c++/include/comedi_iostream.hpp b/c++/include/comedi_iostream.hpp
new file mode 100644
index 0000000..6600b52
--- /dev/null
+++ b/c++/include/comedi_iostream.hpp
@@ -0,0 +1,72 @@
+/*
+	Input and output stream classes for comedilib's C++ binding.
+	The << and >> operators are NOT useful, as the overloaded bitshift
+	operators are used for formatting.  Instead use the unformatted read() and
+	write() member functions.
+
+	Copyright (C) 2007  Frank Mori Hess <fmhess@users.sourceforge.net>
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program; if not, write to the Free Software
+	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef _COMEDILIB_IOSTREAM_HPP
+#define _COMEDILIB_IOSTREAM_HPP
+
+#include <comedilib.hpp>
+#include <cstdio>
+#include <ext/stdio_filebuf.h>
+#include <iostream>
+#include <unistd.h>
+
+namespace comedi
+{
+	namespace detail
+	{
+		class filebuf
+		{
+		public:
+			filebuf(const comedi::device &dev, std::ios::openmode mode, size_t buffer_size)
+			{
+				int fd = dup(dev.fileno());
+				if(fd < 0)
+				{
+					throw std::invalid_argument(__PRETTY_FUNCTION__);
+				}
+				m_filebuf.reset(new __gnu_cxx::stdio_filebuf<char>(fd, mode, buffer_size));
+			}
+			boost::scoped_ptr<__gnu_cxx::stdio_filebuf<char> > m_filebuf;
+		};
+	}
+
+	class istream: private detail::filebuf, public std::istream
+	{
+	public:
+		istream(const comedi::device &dev, size_t buffer_size = static_cast<size_t>(BUFSIZ)):
+			detail::filebuf(dev, std::ios::in | std::ios::binary, buffer_size),
+			std::istream(this->m_filebuf.get())
+		{}
+	};
+
+	class ostream: private detail::filebuf, public std::ostream
+	{
+	public:
+		ostream(const comedi::device &dev, size_t buffer_size = static_cast<size_t>(BUFSIZ)):
+			detail::filebuf(dev, std::ios::out | std::ios::binary, buffer_size),
+			std::ostream(this->m_filebuf.get())
+		{}
+	};
+};
+
+#endif	// _COMEDILIB_IOSTREAM_HPP