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/*
File: __acl_reorder_obj_p.c
(Linux Access Control List Management, Posix Library Functions)
Copyright (C) 1999, 2000
Andreas Gruenbacher, <andreas.gruenbacher@gmail.com>
This library 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 library 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <alloca.h>
#include "libacl.h"
static inline int
__acl_entry_p_compare(const acl_entry_obj *a_p, const acl_entry_obj *b_p)
{
if (a_p->etag < b_p->etag)
return -1;
else if (a_p->etag > b_p->etag)
return 1;
if (a_p->eid.qid < b_p->eid.qid)
return -1;
else if (a_p->eid.qid > b_p->eid.qid)
return 1;
else
return 0;
}
static int
__acl_entry_pp_compare(const void *a, const void *b)
{
return __acl_entry_p_compare(*(const acl_entry_obj **)a,
*(const acl_entry_obj **)b);
}
/*
Take an ACL entry form its current place in the entry ring,
and insert it at its proper place. Entries that are not valid
(yet) are not reordered.
*/
int
__acl_reorder_entry_obj_p(acl_entry_obj *entry_obj_p)
{
acl_obj *acl_obj_p = entry_obj_p->econtainer;
acl_entry_obj *here_obj_p;
if (acl_obj_p->aused <= 1)
return 0;
switch(entry_obj_p->etag) {
case ACL_UNDEFINED_TAG:
return 1;
case ACL_USER:
case ACL_GROUP:
if (qualifier_obj_id(entry_obj_p->eid) ==
ACL_UNDEFINED_ID)
return 1;
}
/* Remove entry from ring */
entry_obj_p->eprev->enext = entry_obj_p->enext;
entry_obj_p->enext->eprev = entry_obj_p->eprev;
/* Search for next greater entry */
FOREACH_ACL_ENTRY(here_obj_p, acl_obj_p) {
if (__acl_entry_p_compare(here_obj_p, entry_obj_p) > 0)
break;
}
/* Re-insert entry into ring */
entry_obj_p->eprev = here_obj_p->eprev;
entry_obj_p->enext = here_obj_p;
entry_obj_p->eprev->enext = entry_obj_p;
entry_obj_p->enext->eprev = entry_obj_p;
return 0;
}
/*
Sort all ACL entries at once, after initializing them. This function is
only used when converting complete ACLs from external formats to ACLs;
the ACL entries are always kept in canonical order while an ACL is
manipulated.
*/
int
__acl_reorder_obj_p(acl_obj *acl_obj_p)
{
acl_entry_obj **vector = alloca(sizeof(acl_entry_obj *) *
acl_obj_p->aused), **v, *x;
acl_entry_obj *entry_obj_p;
if (acl_obj_p->aused <= 1)
return 0;
v = vector;
FOREACH_ACL_ENTRY(entry_obj_p, acl_obj_p) {
*v++ = entry_obj_p;
}
qsort(vector, acl_obj_p->aused, sizeof(acl_entry_obj *),
__acl_entry_pp_compare);
x = (acl_entry_obj *)acl_obj_p;
for (v = vector; v != vector + acl_obj_p->aused; v++) {
(*v)->eprev = x;
x = *v;
}
acl_obj_p->aprev = *(vector + acl_obj_p->aused - 1);
x = (acl_entry_obj *)acl_obj_p;
for (v = vector + acl_obj_p->aused - 1; v != vector - 1; v--) {
(*v)->enext = x;
x = *v;
}
acl_obj_p->anext = *vector;
return 0;
}
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