/**

 * vim: set ts=4 sw=4 tw=99 et :

 * =============================================================================

 * SourceMod

 * Copyright (C) 2004-2009 AlliedModders LLC.  All rights reserved.

 * =============================================================================

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, version 3.0, as published by the

 * Free Software Foundation.

 * 

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more

 * details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to link the

 * code of this program (as well as its derivative works) to "Half-Life 2," the

 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

 * by the Valve Corporation.  You must obey the GNU General Public License in

 * all respects for all other code used.  Additionally, AlliedModders LLC grants

 * this exception to all derivative works.  AlliedModders LLC defines further

 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

 * or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#include <string.h>

#include <ctype.h>

#include "stringutil.h"

const char *stristr(const char *str, const char *substr)

{

	if (!*substr)

	{

		return ((char *)str);

	}

	char *needle = (char *)substr;

	char *prevloc = (char *)str;

	char *haystack = (char *)str;

	while (*haystack)

	{

		if (tolower(*haystack) == tolower(*needle))

		{

			haystack++;

			if (!*++needle)

			{

				return prevloc;

			}

		}

		else

		{

			haystack = ++prevloc;

			needle = (char *)substr;

		}

	}

	return NULL;

}