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//Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc.
//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)
//This example demonstrates the intended use of various commonly used
//error_info typedefs provided by Boost Exception.
#include <boost/exception/errinfo_api_function.hpp>
#include <boost/exception/errinfo_at_line.hpp>
#include <boost/exception/errinfo_errno.hpp>
#include <boost/exception/errinfo_file_handle.hpp>
#include <boost/exception/errinfo_file_name.hpp>
#include <boost/exception/errinfo_file_open_mode.hpp>
#include <boost/exception/info.hpp>
#include <boost/throw_exception.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <stdio.h>
#include <errno.h>
#include <exception>
struct error : virtual std::exception, virtual boost::exception { };
struct file_error : virtual error { };
struct file_open_error: virtual file_error { };
struct file_read_error: virtual file_error { };
boost::shared_ptr<FILE>
open_file( char const * file, char const * mode )
{
if( FILE * f=fopen(file,mode) )
return boost::shared_ptr<FILE>(f,fclose);
else
BOOST_THROW_EXCEPTION(
file_open_error() <<
boost::errinfo_api_function("fopen") <<
boost::errinfo_errno(errno) <<
boost::errinfo_file_name(file) <<
boost::errinfo_file_open_mode(mode) );
}
size_t
read_file( boost::shared_ptr<FILE> const & f, void * buf, size_t size )
{
size_t nr=fread(buf,1,size,f.get());
if( ferror(f.get()) )
BOOST_THROW_EXCEPTION(
file_read_error() <<
boost::errinfo_api_function("fread") <<
boost::errinfo_errno(errno) <<
boost::errinfo_file_handle(f) );
return nr;
}
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