/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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(_MSC_VER) && (_MSC_VER >= 1400)
#pragma warning(disable:4740)
#endif

#include "macros.h"

#ifdef __cplusplus
#define local inline
#else
#define local static
#endif

local LPCWSTR SkipBlanks( LPCWSTR lpScan )
{
	while ( ' ' == *lpScan || '\t' == *lpScan )
		lpScan++;

	return lpScan;
}


local LPCWSTR SkipArgument( LPCWSTR lpScan )
{
	BOOL	fQuoted = FALSE;
	LPCWSTR	lpArgEnd = NULL;

	do
	{
		switch ( *lpScan )
		{
		case ' ':
		case '\t':
			if ( fQuoted )
				lpScan++;
			else
				lpArgEnd = lpScan;
			break;
		case '\"':
			lpScan++;
			fQuoted = !fQuoted;
			break;
		case '\0':
			lpArgEnd = lpScan;
			break;
		default:
			lpScan++;
			break;
		}
	} while( *lpScan && !lpArgEnd );

	return lpScan;
}


IMPLEMENT_THUNK( shell32, WINDOWS, LPWSTR *, WINAPI, CommandLineToArgvW, ( LPCWSTR lpCmdLineW, int *pNumArgs ) )
{
	LPWSTR	*lpArgvW = NULL;

	if ( !lpCmdLineW || !*lpCmdLineW )
	{
		CHAR	szFileName[MAX_PATH];

		DWORD	dwResult = GetModuleFileNameA( NULL, szFileName, MAX_PATH );

		if ( dwResult && dwResult < MAX_PATH )
		{
			int cchNeeded = MultiByteToWideChar( CP_ACP, 0, szFileName, -1, NULL, 0 );

			lpArgvW = (LPWSTR *)GlobalAlloc( 0, cchNeeded * sizeof(WCHAR) + sizeof(LPWSTR) );

			if ( lpArgvW )
			{
				lpArgvW[0] = (LPWSTR)(lpArgvW + 1);

				MultiByteToWideChar( CP_ACP, 0, szFileName, -1, lpArgvW[0], cchNeeded );
				*pNumArgs = 1;
			}
			else
				SetLastError( ERROR_OUTOFMEMORY );
		}
	}
	else
	{
		LPCWSTR	lpScan = lpCmdLineW;
		int		nTokens = 0;
		int		cchNeeded = 0;

		// Count arguments and required size

		while ( *lpScan )
		{
			lpScan = SkipBlanks( lpScan );
			if ( *lpScan )
			{
				LPCWSTR	lpArgEnd = SkipArgument( lpScan );

				nTokens++;
				cchNeeded += lpArgEnd - lpScan + 1;
				lpScan = lpArgEnd;
			}
		}

		// Allocate space for one additional NULL pointer to terminate list

		lpArgvW = (LPWSTR *)GlobalAlloc( 0, sizeof(LPWSTR) * (nTokens + 1) + sizeof(WCHAR) * cchNeeded );

		if ( lpArgvW )
		{
			// Collect arguments

			LPWSTR	lpDestination = (LPWSTR)&lpArgvW[nTokens + 1];

			lpScan = lpCmdLineW;
			nTokens = 0;

			while ( *lpScan )
			{
				lpScan = SkipBlanks( lpScan );
				if ( *lpScan )
				{
					LPCWSTR	lpArgEnd = SkipArgument( lpScan );

					lpArgvW[nTokens++] = lpDestination;

					while ( lpScan < lpArgEnd )
					{
						if ( '\"' != *lpScan )
							*lpDestination++ = *lpScan;

						lpScan++;
					}
					*lpDestination++ = 0;
				}
			}

			lpArgvW[nTokens] = NULL;

			*pNumArgs = nTokens;
		}
		else
			SetLastError( ERROR_OUTOFMEMORY );

	}

	return lpArgvW;
}