/*
 * 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 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

/* EMACS_MODES: !fill, lnumb, !overwrite, !nodelete, !picture */

#include "stdio.h"
#include "errno.h"
#include "string.h"
#include "stdlib.h"

#include "lp.h"
#include "access.h"

static char             **_loadaccess ( char * );

/**
 ** load_userform_access() - LOAD ALLOW/DENY LISTS FOR USER+FORM
 **/

int
load_userform_access(char *form, char ***pallow, char ***pdeny)
{
        return (loadaccess(Lp_A_Forms, form, "", pallow, pdeny));
}

/**
 ** load_userprinter_access() - LOAD ALLOW/DENY LISTS FOR USER+PRINTER
 **/

int
load_userprinter_access(char *printer, char ***pallow, char ***pdeny)
{
        return (loadaccess(Lp_A_Printers, printer, UACCESSPREFIX, pallow,
                pdeny));
}

/**
 ** load_formprinter_access() - LOAD ALLOW/DENY LISTS FOR FORM+PRINTER
 **/

int
load_formprinter_access(char *printer, char ***pallow, char ***pdeny)
{
        return (loadaccess(Lp_A_Printers, printer, FACCESSPREFIX, pallow,
                pdeny));
}

/**
 ** load_paperprinter_access() - LOAD ALLOW/DENY LISTS FOR FORM+PRINTER
 **/

int
load_paperprinter_access(char *printer, char ***pallow, char ***pdeny)
{
        return (loadaccess(Lp_A_Printers, printer, PACCESSPREFIX, pallow,
                pdeny));
}

/**
 ** loadaccess() - LOAD ALLOW OR DENY LISTS
 **/

int
loadaccess(char *dir, char *name, char *prefix, char ***pallow, char ***pdeny)
{
        register char           *allow_file     = 0,
                                *deny_file      = 0;

        int                     ret;

        if (
                !(allow_file = getaccessfile(dir, name, prefix, ALLOWFILE))
             || !(*pallow = _loadaccess(allow_file)) && errno != ENOENT
             || !(deny_file = getaccessfile(dir, name, prefix, DENYFILE))
             || !(*pdeny = _loadaccess(deny_file)) && errno != ENOENT
        )
                ret = -1;
        else
                ret = 0;

        if (allow_file)
                Free (allow_file);
        if (deny_file)
                Free (deny_file);

        return (ret);
}

/**
 ** _loadaccess() - LOAD ALLOW OR DENY FILE
 **/

static char **
_loadaccess(char *file)
{
        register size_t         nalloc,
                                nlist;

        register char           **list;

        int fd;

        char                    buf[BUFSIZ];


        if ((fd = open_locked(file, "r", 0)) < 0)
                return (0);

        /*
         * Preallocate space for the initial list. We'll always
         * allocate one more than the list size, for the terminating null.
         */
        nalloc = ACC_MAX_GUESS;
        list = (char **)Malloc((nalloc + 1) * sizeof(char *));
        if (!list) {
                close(fd);
                errno = ENOMEM;
                return (0);
        }

        errno = 0;
        for (nlist = 0; fdgets(buf, BUFSIZ, fd); ) {

                buf[strlen(buf) - 1] = 0;

                /*
                 * Allocate more space if needed.
                 */
                if (nlist >= nalloc) {
                        nalloc += ACC_MAX_GUESS;
                        list = (char **)Realloc(
                                (char *)list,
                                (nalloc + 1) * sizeof(char *)
                        );
                        if (!list) {
                                close(fd);
                                return (0);
                        }
                }

                list[nlist] = Strdup(buf);   /* if fail, minor problem */
                list[++nlist] = 0;

        }
        if (errno != 0) {
                int                     save_errno = errno;

                close(fd);
                freelist (list);
                errno = save_errno;
                return (0);
        }
        close(fd);

        /*
         * If we have more space allocated than we need,
         * return the extra.
         */
        if (nlist != nalloc) {
                list = (char **)Realloc(
                        (char *)list,
                        (nlist + 1) * sizeof(char *)
                );
                if (!list) {
                        errno = ENOMEM;
                        return (0);
                }
        }
        list[nlist] = 0;

        return (list);
}