//
// Environment_VMS.cpp
//
// $Id: //poco/1.2/Foundation/src/Environment_VMS.cpp#1 $
//
// Library: Foundation
// Package: Core
// Module:  Environment
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Environment_VMS.h"
#include "Poco/Exception.h"
#include <stdlib.h>
#include <starlet.h>
#include <descrip.h>
#include <ssdef.h>
#include <syidef.h>
#include <iledef.h>
#include <lnmdef.h>


namespace Poco {


FastMutex EnvironmentImpl::_mutex;


std::string EnvironmentImpl::getImpl(const std::string& name)
{
	FastMutex::ScopedLock lock(_mutex);
	
	const char* val = getenv(name.c_str());
	if (val)
		return std::string(val);
	else
		throw NotFoundException(name);
}


bool EnvironmentImpl::hasImpl(const std::string& name)
{
	FastMutex::ScopedLock lock(_mutex);

	return getenv(name.c_str()) != 0;
}


void EnvironmentImpl::setImpl(const std::string& name, const std::string& value)
{
	FastMutex::ScopedLock lock(_mutex);
	
	if (setenv(name.c_str(), value.c_str(), 1))
	{
		std::string msg = "cannot set environment variable: ";
		msg.append(name);
		throw SystemException(msg);
	}
}


std::string EnvironmentImpl::osNameImpl()
{
	return getsyi(SYI$_NODE_SWTYPE);
}


std::string EnvironmentImpl::osVersionImpl()
{
	return getsyi(SYI$_VERSION);
}


std::string EnvironmentImpl::osArchitectureImpl()
{
	return getsyi(SYI$_ARCH_NAME);
}


std::string EnvironmentImpl::nodeNameImpl()
{
	return getsyi(SYI$_NODENAME);
}


std::string EnvironmentImpl::getsyi(unsigned short code)
{
	#pragma pointer_size save
	#pragma pointer_size 32

	unsigned char result[16];
	unsigned short length;

	ILE3 items[2];
	items[0].ile3$w_code         = code;
	items[0].ile3$w_length       = sizeof(result);
	items[0].ile3$ps_bufaddr     = result;
	items[0].ile3$ps_retlen_addr = &length;
	items[1].ile3$w_code         = 0;
	items[1].ile3$w_length       = 0;

	if (sys$getsyiw(0, 0, 0, items, 0, 0, 0) == 1)
		return std::string((char*) result, length);
	else
		throw SystemException("$GETSYI failed");

	#pragma pointer_size restore
}


std::string EnvironmentImpl::trnlnm(const std::string& name)
{
	#pragma pointer_size save
	#pragma pointer_size 32

	unsigned char result[LNM$C_NAMLENGTH];
	unsigned short length;
	
	ILE3 items[2];
	items[0].ile3$w_code         = LNM$_STRING;
	items[0].ile3$w_length       = sizeof(result);
	items[0].ile3$ps_bufaddr     = result;
	items[0].ile3$ps_retlen_addr = &length;
	items[1].ile3$w_code         = 0;
	items[1].ile3$w_length       = 0;

	#pragma pointer_size restore

	unsigned int trnAttr = LNM$M_CASE_BLIND;
	POCO_DESCRIPTOR_LITERAL(tableDsc, "LNM$FILE_DEV");
	POCO_DESCRIPTOR_STRING(nameDsc, name);
	if (sys$trnlnm(&trnAttr, &tableDsc, &nameDsc, 0, &items) == 1)
	{
		if (result[0] == 0x1B)
			return std::string((char*) result + 4, length - 4);
		else
			return std::string((char*) result, length);
	}
	else
	{
		return std::string();
	}
}


} // namespace Poco