You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
2.1 KiB
109 lines
2.1 KiB
/* idl.c - ldap bdb back-end ID list functions */
|
|
/* $OpenLDAP$ */
|
|
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
|
|
*
|
|
* Copyright 2000-2011 The OpenLDAP Foundation.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted only as authorized by the OpenLDAP
|
|
* Public License.
|
|
*
|
|
* A copy of this license is available in the file LICENSE in the
|
|
* top-level directory of the distribution or, alternatively, at
|
|
* <http://www.OpenLDAP.org/license.html>.
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <assert.h>
|
|
#include "idl.h"
|
|
|
|
typedef unsigned long pgno_t;
|
|
|
|
/* Sort the IDLs from highest to lowest */
|
|
#define IDL_CMP(x,y) ( x > y ? -1 : ( x < y ? 1 : 0 ) )
|
|
|
|
unsigned mdb_idl_search( ID *ids, ID id )
|
|
{
|
|
/*
|
|
* binary search of id in ids
|
|
* if found, returns position of id
|
|
* if not found, returns first position greater than id
|
|
*/
|
|
unsigned base = 0;
|
|
unsigned cursor = 0;
|
|
int val = 0;
|
|
unsigned n = ids[0];
|
|
|
|
while( 0 < n ) {
|
|
int pivot = n >> 1;
|
|
cursor = base + pivot;
|
|
val = IDL_CMP( id, ids[cursor + 1] );
|
|
|
|
if( val < 0 ) {
|
|
n = pivot;
|
|
|
|
} else if ( val > 0 ) {
|
|
base = cursor + 1;
|
|
n -= pivot + 1;
|
|
|
|
} else {
|
|
return cursor + 1;
|
|
}
|
|
}
|
|
|
|
if( val > 0 ) {
|
|
return cursor + 2;
|
|
} else {
|
|
return cursor + 1;
|
|
}
|
|
}
|
|
|
|
int mdb_idl_insert( ID *ids, ID id )
|
|
{
|
|
unsigned x;
|
|
|
|
if (MDB_IDL_IS_RANGE( ids )) {
|
|
/* if already in range, treat as a dup */
|
|
if (id >= MDB_IDL_FIRST(ids) && id <= MDB_IDL_LAST(ids))
|
|
return -1;
|
|
if (id < MDB_IDL_FIRST(ids))
|
|
ids[1] = id;
|
|
else if (id > MDB_IDL_LAST(ids))
|
|
ids[2] = id;
|
|
return 0;
|
|
}
|
|
|
|
x = mdb_idl_search( ids, id );
|
|
assert( x > 0 );
|
|
|
|
if( x < 1 ) {
|
|
/* internal error */
|
|
return -2;
|
|
}
|
|
|
|
if ( x <= ids[0] && ids[x] == id ) {
|
|
/* duplicate */
|
|
return -1;
|
|
}
|
|
|
|
if ( ++ids[0] >= MDB_IDL_DB_MAX ) {
|
|
if( id < ids[1] ) {
|
|
ids[1] = id;
|
|
ids[2] = ids[ids[0]-1];
|
|
} else if ( ids[ids[0]-1] < id ) {
|
|
ids[2] = id;
|
|
} else {
|
|
ids[2] = ids[ids[0]-1];
|
|
}
|
|
ids[0] = NOID;
|
|
|
|
} else {
|
|
/* insert id */
|
|
AC_MEMCPY( &ids[x+1], &ids[x], (ids[0]-x) * sizeof(ID) );
|
|
ids[x] = id;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|