search_path.hpp

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// Copyright (c) 2006, 2007 Julio M. Merino Vidal
// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
// Copyright (c) 2009 Boris Schaeling
// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
//
// 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)
 
#pragma once
 
#include <boost/process/config.hpp>
#include <filesystem>
#include <boost/tokenizer.hpp>
#include <string>
#include <stdexcept>
#include <stdlib.h>
#include <unistd.h>
 
namespace boost::process::posix
{
 
    inline std::string search_path(const std::string& filename,
                                   std::string path = "")
    {
        if (path.empty())
        {
            path = ::getenv("PATH");
            if (path.empty())
                BOOST_PROCESS_THROW(std::runtime_error(
                                        "Environment variable PATH not found"));
        }
 
        std::string result;
        using tokenizer = boost::tokenizer<boost::char_separator<char> >;
        boost::char_separator<char> sep(":");
        tokenizer tok(path, sep);
        for (tokenizer::iterator it = tok.begin(); it != tok.end(); ++it)
        {
            std::filesystem::path p = *it;
            p /= filename;
            if (!::access(p.c_str(), X_OK))
            {
                result = p.string();
                break;
            }
        }
        return result;
    }
 
}