/*****************************************************************************\
 *  slurm_strcasestr.h - case insensitve version of strstr()
 *****************************************************************************
 *  Copyright (C) 2009 Lawrence Livermore National Security.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by David Bremer <dbremer@llnl.gov>
 *  CODE-OCEC-09-009. All rights reserved.
 *
 *  This file is part of SLURM, a resource management program.
 *  For details, see <http://slurm.schedmd.com/>.
 *  Please also read the included file: DISCLAIMER.
 *
 *  SLURM is free software; you can redistribute it and/or modify it under
 *  the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  In addition, as a special exception, the copyright holders give permission
 *  to link the code of portions of this program with the OpenSSL library under
 *  certain conditions as described in each individual source file, and
 *  distribute linked combinations including the two. You must obey the GNU
 *  General Public License in all respects for all of the code used other than
 *  OpenSSL. If you modify file(s) with this exception, you may extend this
 *  exception to your version of the file(s), but you are not obligated to do
 *  so. If you do not wish to do so, delete this exception statement from your
 *  version.  If you delete this exception statement from all source files in
 *  the program, then also delete it here.
 *
 *  SLURM 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 SLURM; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
\*****************************************************************************/

#include "slurm_strcasestr.h"
#include <string.h>
#include <ctype.h>

/* case insensitve version of strstr() */
char *
slurm_strcasestr(char *haystack, char *needle)
{
	int hay_inx,  hay_size  = strlen(haystack);
	int need_inx, need_size = strlen(needle);
	char *hay_ptr = haystack;

	for (hay_inx=0; hay_inx<hay_size; hay_inx++) {
		for (need_inx=0; need_inx<need_size; need_inx++) {
			if (tolower((int) hay_ptr[need_inx]) !=
			    tolower((int) needle [need_inx]))
				break;		/* mis-match */
		}

		if (need_inx == need_size)	/* it matched */
			return hay_ptr;
		else				/* keep looking */
			hay_ptr++;
	}

	return NULL;	/* no match anywhere in string */
}