path_unix.cpp

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// Path_UNIX.cpp
//
// $Id: //poco/Main/Foundation/src/Path_UNIX.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#include "Foundation/Path_UNIX.h"
#include "Foundation/Exception.h"
#include "Foundation/Environment_UNIX.h"
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <pwd.h>
#include <ctype.h>
#include <limits.h>
#include <locale>


#ifndef PATH_MAX
#define PATH_MAX 1024 // fallback
#endif


Foundation_BEGIN


std::string PathImp::currentImp()
{
	std::string path;
	char cwd[PATH_MAX];
	if (getcwd(cwd, sizeof(cwd)))
		path = cwd;
	else
		throw SystemException("cannot get current directory");
	std::string::size_type n = path.size();
	if (n > 0 && path[n - 1] != '/') path.append("/");
	return path;
}


std::string PathImp::homeImp()
{
	std::string path;
	struct passwd* pwd = getpwuid(getuid());
	if (pwd)
		path = pwd->pw_dir;
	else
	{
		pwd = getpwuid(geteuid());
		if (pwd)
			path = pwd->pw_dir;
		else
			path = EnvironmentImp::getImp("HOME");
	}
	std::string::size_type n = path.size();
	if (n > 0 && path[n - 1] != '/') path.append("/");
	return path;
}


std::string PathImp::tempImp()
{
	std::string path;
	char* tmp = getenv("TMPDIR");
	if (tmp)
	{
		path = tmp;
		std::string::size_type n = path.size();
		if (n > 0 && path[n - 1] != '/') path.append("/");
	}
	else
	{
		path = "/tmp/";
	}
	return path;
}


std::string PathImp::nullImp()
{
	return "/dev/null";
}


std::string PathImp::expandImp(const std::string& path)
{
	std::locale loc;
	std::string result;
	std::string::const_iterator it  = path.begin();
	std::string::const_iterator end = path.end();
	if (it != end && *it == '~')
	{
		++it;
		if (it != end && *it == '/')
		{
			result += homeImp(); ++it;
		}
		else result += '~';
	}
	while (it != end)
	{
		if (*it == '$')
		{
			std::string var;
			++it;
			if (it != end && *it == '{')
			{
				++it;
				while (it != end && *it != '}') var += *it++;
				if (it != end) ++it;
			}
			else
			{
				while (it != end && (isalnum(*it, loc) || *it == '_')) var += *it++;
			}
			char* val = getenv(var.c_str());
			if (val) result += val;
		}
		else result += *it++;
	}
	return result;
}


void PathImp::listRootsImp(std::vector<std::string>& roots)
{
	roots.clear();
	roots.push_back("/");
}


Foundation_END