boost/test/utils/runtime/env/fetch.hpp

//  (C) Copyright Gennadiy Rozental 2001.
//  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)
//  See http://www.boost.org/libs/test for the library home page.
//
//  File        : $RCSfile$
//
//  Version     : $Revision$
//
//  Description : implements fetching absent parameter athuments from environment
// ***************************************************************************
#ifndef BOOST_TEST_UTILS_RUNTIME_ENV_FETCH_HPP
#define BOOST_TEST_UTILS_RUNTIME_ENV_FETCH_HPP
// Boost.Test Runtime parameters
#include <boost/test/utils/runtime/parameter.hpp>
#include <boost/test/utils/runtime/argument.hpp>
#include <boost/test/detail/suppress_warnings.hpp>
// C Runtime
#include <stdlib.h>
namespace boost {
namespace runtime {
namespace env {
namespace env_detail {
#ifndef UNDER_CE
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4996) // getenv
#endif
inline std::pair<cstring,bool>
sys_read_var( cstring var_name )
{
    using namespace std;
    char const* res = getenv( var_name.begin() );
    return std::make_pair( cstring(res), res != NULL );
}
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
#else
inline std::pair<cstring,bool>
sys_read_var( cstring var_name )
{
    return std::make_pair( cstring(), false );
}
#endif
//____________________________________________________________________________//
template<typename ReadFunc>
inline void
fetch_absent( parameters_store const& params, runtime::arguments_store& args, ReadFunc read_func )
{
    BOOST_TEST_FOREACH( parameters_store::storage_type::value_type const&, v, params.all() ) {
        basic_param_ptr param = v.second;
        if( args.has( param->p_name ) || param->p_env_var.empty() )
            continue;
        std::pair<cstring,bool> value = read_func( param->p_env_var );
        if( !value.second )
            continue;
        // Validate against unexpected empty value
        BOOST_TEST_I_ASSRT( !value.first.is_empty() || param->p_has_optional_value,
            format_error( param->p_name ) 
                << "Missing an argument value for the parameter " << param->p_name
                << " in the environment." );
        // Produce argument value
        param->produce_argument( value.first, false, args );
    }
}
//____________________________________________________________________________//
} // namespace env_detail
inline void
fetch_absent( parameters_store const& params, runtime::arguments_store& args )
{
    env_detail::fetch_absent( params, args, &env_detail::sys_read_var );
}
} // namespace env
} // namespace runtime
} // namespace boost
#include <boost/test/detail/enable_warnings.hpp>
#endif // BOOST_TEST_UTILS_RUNTIME_ENV_FETCH_HPP