/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License, Version 1.0 only

 * (the "License").  You may not use this file except in compliance

 * with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma weak gethz = _gethz

#include "synonyms.h"

#include <stdio.h>

#include <ctype.h>

#include <stdlib.h>

/*

 *	gethz -- get the value of the clock hertz from the environment.

 *

 *	return the clock hertz value if the string "HZ" in the environment is:

 *		1) Composed entirely of numbers.

 *		2) Not equal to zero.

 *	Otherwise 0 is returned.

 */

int

gethz(void)

{

	char *sptr, *cptr;

	if ((sptr = getenv("HZ")) == NULL) {

		return (0);

	} else {

		cptr = sptr;

		/* Check that all characters are numeric */

		while (*cptr) {

			if (!isdigit((unsigned char)*cptr))

				return (0);

			cptr++;

		}

		return (atoi(sptr));

	}

}