/*
 * 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   */

#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);
                }
        }
}