/*
 * 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 cuserid = _cuserid

#include "synonyms.h"
#include <stdio.h>
#include <pwd.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

static char res[L_cuserid];

char *
cuserid(char *s)
{
	struct passwd *pw;
	struct passwd pwd;
	char buffer[BUFSIZ];
	char utname[L_cuserid];
	char *p;

	if (s == NULL)
		s = res;
	p = getlogin_r(utname, L_cuserid);
	s[L_cuserid - 1] = '\0';
	if (p != NULL)
		return (strncpy(s, p, L_cuserid - 1));
	pw = getpwuid_r(getuid(), &pwd, buffer, BUFSIZ);
	if (pw != NULL)
		return (strncpy(s, pw->pw_name, L_cuserid - 1));
	*s = '\0';
	return (NULL);
}