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acl_calc_mask.c

/*
  File: acl_calc_mask.c

  Copyright (C) 1999, 2000
  Andreas Gruenbacher, <a.gruenbacher@computer.org>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 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
  Library General Public License for more details.

  You should have received a copy of the GNU Library 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 "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;
}


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