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/* Merging of ugids
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <errno.h>
#include "idvec.h"
#include "ugids.h"
static error_t
_merge_gids (struct idvec *gids, struct idvec *gids_imp,
const struct idvec *new, const struct idvec *new_imp)
{
error_t err;
/* Gids that exist in both GIDS and NEW can only be implied in the result
if they are implied in both; here GIDS_STRONG and NEW_STRONG contain
those gids which shouldn't be implied in the result because they are not
in either of the sources. */
struct idvec gids_strong = IDVEC_INIT;
struct idvec new_strong = IDVEC_INIT;
err = idvec_set (&gids_strong, gids);
if (! err)
err = idvec_set (&new_strong, new);
if (! err)
{
idvec_subtract (&gids_strong, gids_imp);
idvec_subtract (&new_strong, new_imp);
err = idvec_merge (gids, new);
if (! err)
{
err = idvec_merge (gids_imp, new_imp);
if (! err)
{
idvec_subtract (gids_imp, &gids_strong);
idvec_subtract (gids_imp, &new_strong);
}
}
}
idvec_fini (&gids_strong);
idvec_fini (&new_strong);
return err;
}
/* Add all ids in NEW to UGIDS. */
error_t
ugids_merge (struct ugids *ugids, const struct ugids *new)
{
error_t err;
err = idvec_merge (&ugids->eff_uids, &new->eff_uids);
if (! err)
err = idvec_merge (&ugids->avail_uids, &new->avail_uids);
if (! err)
err = _merge_gids (&ugids->eff_gids, &ugids->imp_eff_gids,
&new->eff_gids, &new->imp_eff_gids);
if (! err)
err = _merge_gids (&ugids->avail_gids, &ugids->imp_avail_gids,
&new->avail_gids, &new->imp_avail_gids);
return err;
}
/* Set the ids in UGIDS to those in NEW. */
error_t
ugids_set (struct ugids *ugids, const struct ugids *new)
{
idvec_clear (&ugids->eff_uids);
idvec_clear (&ugids->eff_gids);
idvec_clear (&ugids->avail_uids);
idvec_clear (&ugids->avail_gids);
idvec_clear (&ugids->imp_eff_gids);
idvec_clear (&ugids->imp_avail_gids);
return ugids_merge (ugids, new);
}
/* Save any effective ids in UGIDS by merging them into the available ids,
and removing them from the effective ones. */
error_t
ugids_save (struct ugids *ugids)
{
error_t err = idvec_merge (&ugids->avail_uids, &ugids->eff_uids);
if (! err)
err = _merge_gids (&ugids->avail_gids, &ugids->imp_avail_gids,
&ugids->eff_gids, &ugids->imp_eff_gids);
if (! err)
{
idvec_clear (&ugids->eff_uids);
idvec_clear (&ugids->eff_gids);
idvec_clear (&ugids->imp_eff_gids);
}
return err;
}
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