usr/src/ucbcmd/printenv/printenv.c

/*
 * 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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

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

/*
 * printenv
 */

#include <stdio.h>

extern	char **environ;

static int prefix(char *cp, char *dp);

int
main(int argc, char *argv[])
{
	char **ep;
	int found = 0;

	argc--, argv++;

	if (environ)
		for (ep = environ; *ep; ep++)
			if (argc == 0 || prefix(argv[0], *ep)) {
				char *cp = *ep;

				found++;
				if (argc) {
					while (*cp && *cp != '=')
						cp++;
					if (*cp == '=')
						cp++;
				}
				(void) printf("%s\n", cp);
			}
	return (!found);
}

static int
prefix(char *cp, char *dp)
{

	while (*cp && *dp && *cp == *dp)
		cp++, dp++;
	if (*cp == 0)
		return (*dp == '=');
	return (0);
}