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184 lines
3.2 KiB
184 lines
3.2 KiB
/** @file midl.c
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* @brief ldap bdb back-end ID List functions */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 2000-2011 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include <string.h>
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#include <sys/types.h>
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#include <assert.h>
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#include "midl.h"
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/** @defgroup internal MDB Internals
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* @{
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*/
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/** @defgroup idls ID List Management
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* @{
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*/
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#define CMP(x,y) ( (x) < (y) ? -1 : (x) > (y) )
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static unsigned mdb_midl_search( IDL ids, ID id )
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{
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/*
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* binary search of id in ids
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* if found, returns position of id
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* if not found, returns first position greater than id
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*/
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unsigned base = 0;
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unsigned cursor = 0;
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int val = 0;
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unsigned n = ids[0];
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while( 0 < n ) {
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int pivot = n >> 1;
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cursor = base + pivot;
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val = CMP( ids[cursor + 1], id );
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if( val < 0 ) {
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n = pivot;
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} else if ( val > 0 ) {
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base = cursor + 1;
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n -= pivot + 1;
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} else {
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return cursor + 1;
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}
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}
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if( val > 0 ) {
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return cursor + 2;
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} else {
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return cursor + 1;
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}
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}
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int mdb_midl_insert( IDL ids, ID id )
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{
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unsigned x, i;
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if (MDB_IDL_IS_RANGE( ids )) {
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/* if already in range, treat as a dup */
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if (id >= MDB_IDL_FIRST(ids) && id <= MDB_IDL_LAST(ids))
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return -1;
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if (id < MDB_IDL_FIRST(ids))
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ids[1] = id;
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else if (id > MDB_IDL_LAST(ids))
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ids[2] = id;
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return 0;
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}
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x = mdb_midl_search( ids, id );
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assert( x > 0 );
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if( x < 1 ) {
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/* internal error */
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return -2;
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}
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if ( x <= ids[0] && ids[x] == id ) {
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/* duplicate */
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return -1;
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}
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if ( ++ids[0] >= MDB_IDL_DB_MAX ) {
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if( id < ids[1] ) {
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ids[1] = id;
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ids[2] = ids[ids[0]-1];
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} else if ( ids[ids[0]-1] < id ) {
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ids[2] = id;
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} else {
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ids[2] = ids[ids[0]-1];
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}
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ids[0] = NOID;
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} else {
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/* insert id */
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for (i=ids[0]; i>x; i--)
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ids[i] = ids[i-1];
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ids[x] = id;
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}
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return 0;
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}
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unsigned mdb_mid2l_search( ID2L ids, ID id )
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{
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/*
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* binary search of id in ids
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* if found, returns position of id
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* if not found, returns first position greater than id
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*/
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unsigned base = 0;
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unsigned cursor = 0;
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int val = 0;
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unsigned n = ids[0].mid;
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while( 0 < n ) {
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int pivot = n >> 1;
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cursor = base + pivot;
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val = CMP( id, ids[cursor + 1].mid );
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if( val < 0 ) {
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n = pivot;
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} else if ( val > 0 ) {
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base = cursor + 1;
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n -= pivot + 1;
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} else {
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return cursor + 1;
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}
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}
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if( val > 0 ) {
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return cursor + 2;
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} else {
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return cursor + 1;
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}
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}
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int mdb_mid2l_insert( ID2L ids, ID2 *id )
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{
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unsigned x, i;
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x = mdb_mid2l_search( ids, id->mid );
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assert( x > 0 );
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if( x < 1 ) {
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/* internal error */
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return -2;
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}
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if ( x <= ids[0].mid && ids[x].mid == id->mid ) {
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/* duplicate */
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return -1;
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}
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if ( ids[0].mid >= MDB_IDL_DB_MAX ) {
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/* too big */
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return -2;
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} else {
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/* insert id */
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ids[0].mid++;
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for (i=ids[0].mid; i>x; i--)
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ids[i] = ids[i-1];
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ids[x] = *id;
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}
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return 0;
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}
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/** @} */
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/** @} */
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