OpenSolaris_b135/cmd/acct/lib/uidtonam.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 (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
#pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.6	*/
/*
 * convert uid to login name; interface to getpwuid that keeps up to USIZE1
 * names to avoid unnecessary accesses to passwd file
 * returns ptr to NSZ-byte name (not necessarily null-terminated)
 * returns ptr to "?" if cannot convert
 */

#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include "acctdef.h"
#include <pwd.h>

static int usize1;
static struct ulist {
	char	uname[NSZ];
	uid_t	uuid;
} ul[USIZE1];

char *strncpy();

char *
uidtonam(uid)
uid_t	uid;
{
	register struct ulist *up;
	struct passwd *getpwuid();
	register struct passwd *pp;

	for (up = ul; up < &ul[usize1]; up++)
		if (uid == up->uuid)
			return(up->uname);
	setpwent();
	if ((pp = getpwuid(uid)) == NULL)
		return("?");
	else {
		if (usize1 < USIZE1) {
			up->uuid = uid;
			CPYN(up->uname, pp->pw_name);
			usize1++;
		}
		return(pp->pw_name);
	}
}