/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#if defined XALAN_NLS_MSG_LOADER


// Class header file.
#include "XalanNLSMessageLoader.hpp"

#include <xercesc/util/XMLMsgLoader.hpp>

#include <xalanc/PlatformSupport/DOMStringHelper.hpp>

#include <cstring>

#include <cerrno>

XALAN_CPP_NAMESPACE_BEGIN


XALAN_USING_XERCES(XMLMsgLoader)

static const char* const	MSG_FILE_NAME = "XalanMsg_";

#define MAX_LOCALTION_NAME 1024

static const char* const	s_errorMessage = "Message can't be located in the NLS catalog.";

XalanNLSMessageLoader::~XalanNLSMessageLoader()
{
	if ((int)m_catalogHandle != -1)
	{
		catclose(m_catalogHandle);
	}
}

XalanNLSMessageLoader::XalanNLSMessageLoader() :
	m_catalogHandle(nl_catd(-1))
{

    char fileName[50];
    fileName[0] = 0;
    
    sprintf(fileName,"%s", MSG_FILE_NAME);

	const char* Locale = XMLMsgLoader::getLocale();

    if(Locale == 0)
    {
   		Locale = "en_US";
    }

	strcat(fileName, Locale);

    strcat(fileName, ".cat");

   /**
    * To open user-specified locale specific cat file
    * and default cat file if necessary
    */
    m_catalogHandle = catopen(fileName, 0);

    if ((int)m_catalogHandle == -1)
    {
        // Probably have to call panic here
        // the user will get an error with retrieving messages
 		assert(0);
    }
}

bool XalanNLSMessageLoader::loadMsg(XalanMessages::Codes    msgToLoad
								, XalanDOMChar*		toFill
								, unsigned int            maxChars)
{
    
    bool bRetValue = false;

    if( toFill == 0 || maxChars == 0 )
    {
    	return bRetValue;
    }

    if ((int)m_catalogHandle == -1)
    {
    	// for transcoding to Unicode
    	const XalanDOMString	errorMsg("Message can't be retrieved: the message catalog is not open.");
    	
    	if(errorMsg.length() < maxChars)
    	{
    		XalanCopy(errorMsg.c_str(), errorMsg.c_str()+ errorMsg.length() +1 , toFill);
    	}
    }
    else
    {
    	const char* const	catMessage = catgets( m_catalogHandle, 1, (int)msgToLoad+2, s_errorMessage);
	
		// catgets returns a pointer to msgString if it fails to locate the message
		// from the message catalog
    	if (catMessage != 0)
    	{
        	const XalanDOMString	errorMsg(catMessage);
        	
        	if(errorMsg.length() < maxChars)
    		{
    			XalanCopy(errorMsg.c_str(), errorMsg.c_str() + errorMsg.length() +1  , toFill);
    			
    			bRetValue = true;
    		}
        }
    }

    return bRetValue;
}

XALAN_CPP_NAMESPACE_END


#endif // XALAN_NLS_MSG_LOADER