/*

  File: acl_calc_mask.c

  Copyright (C) 1999, 2000

  Andreas Gruenbacher, <a.gruenbacher@bestbits.at>

  This program is free software; you can redistribute it and/or

  modify it under the terms of the GNU Lesser General Public

  License as published by the Free Software Foundation; either

  version 2.1 of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public

  License along with this library; if not, write to the Free Software

  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

*/

#include "config.h"

#include "libacl.h"

/* 23.4.2 */

int

acl_calc_mask(acl_t *acl_p)

{

	acl_obj *acl_obj_p;

	acl_entry_obj *entry_obj_p, *mask_obj_p = NULL;

	permset_t perm = ACL_PERM_NONE;

	if (!acl_p) {

		errno = EINVAL;

		return -1;

	}

	acl_obj_p = ext2int(acl, *acl_p);

	if (!acl_obj_p)

		return -1;

	FOREACH_ACL_ENTRY(entry_obj_p, acl_obj_p) {

		switch(entry_obj_p->etag) {

			case ACL_USER_OBJ:

			case ACL_OTHER:

				break;

			case ACL_MASK:

				mask_obj_p = entry_obj_p;

				break;

			case ACL_USER:

			case ACL_GROUP_OBJ:

			case ACL_GROUP:

				perm |= entry_obj_p->eperm.sperm;

				break;

			default:

				errno = EINVAL;

				return -1;

		}

	}

	if (mask_obj_p == NULL) {

		mask_obj_p = __acl_create_entry_obj(acl_obj_p);

		if (mask_obj_p == NULL)

			return -1;

		mask_obj_p->etag = ACL_MASK;

		__acl_reorder_entry_obj_p(mask_obj_p);

	}

	mask_obj_p->eperm.sperm = perm;

	return 0;

}