/*

 * CDDL HEADER START

 *

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

 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

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

/*	  All Rights Reserved  	*/

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

#include "lint.h"

#include "file64.h"

#include <sys/types.h>

#include <mtlib.h>

#include <ctype.h>

#include <thread.h>

#include <synch.h>

#include <stdio.h>

#include "stdiom.h"

#include "libc.h"

static FILE *pwf;

static mutex_t _pwlock = DEFAULTMUTEX;

const char *PASSWD = "/etc/passwd";

int

getpw(uid_t uid, char buf[])

{

	int n, c;

	char *bp;

	FILE *fp;

	rmutex_t *lk;

	if (pwf == NULL) {

		fp = fopen(PASSWD, "rF");

		lmutex_lock(&_pwlock);

		if (pwf == NULL) {

			if ((pwf = fp) == NULL) {

				lmutex_unlock(&_pwlock);

				return (1);

			}

			fp = NULL;

		}

		lmutex_unlock(&_pwlock);

		if (fp != NULL)		/* someone beat us to it */

			(void) fclose(fp);

	}

	FLOCKFILE(lk, pwf);

	_rewind_unlocked(pwf);

	for (;;) {

		bp = buf;

		while ((c = GETC(pwf)) != '\n') {

			if (c == EOF) {

				FUNLOCKFILE(lk);

				return (1);

			}

			*bp++ = (char)c;

		}

		*bp = '\0';

		bp = buf;

		n = 3;

		while (--n)

			while ((c = *bp++) != ':')

				if (c == '\n') {

					FUNLOCKFILE(lk);

					return (1);

				}

		while ((c = *bp++) != ':')

			if (isdigit(c))

				n = n*10+c-'0';

			else

				continue;

		if (n == uid) {

			FUNLOCKFILE(lk);

			return (0);

		}

	}

}