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

/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 *      getname(name)  --  get logname
 *
 *              getname tries to find the user's logname from:
 *                      ${LOGNAME}, if set and if it is telling the truth
 *                      /etc/passwd, otherwise
 *
 *              The logname is returned as the value of the function.
 *
 *              Getname returns the user's user id converted to ASCII
 *              for unknown lognames.
 *
 */

#include "string.h"
#include "pwd.h"
#include "errno.h"
#include "sys/types.h"
#include "stdlib.h"
#include "unistd.h"

#include "lp.h"

char *
#if     defined(__STDC__)
getname (
        void
)
#else
getname ()
#endif
{
        uid_t                   uid;
        struct passwd           *p;
        static char             *logname        = 0;
        char                    *l;

        if (logname)
                return (logname);

        uid = getuid();

        setpwent ();
        if (
                !(l = getenv("LOGNAME"))
             || !(p = getpwnam(l))
             || p->pw_uid != uid
        )
                if ((p = getpwuid(uid)))
                        l = p->pw_name;
                else
                        l = 0;
        endpwent ();

        if (l)
                logname = Strdup(l);
        else {
                if (uid > 0) {
                        logname = Malloc(10 + 1);
                        if (logname)
                                sprintf (logname, "%d", uid);
                }
        }

        if (!logname)
        {
                errno = ENOMEM;
        }
        else
        {
                errno = 0;
        }

        return (logname);
}