Provide error checked version of various functions from std C library.

Created on 3 July 2011, by Martin Moene

Copyright 2011 Universiteit Leiden

Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

For more information, see the documentation in ./doc. Generate with 'make doc'.