6e9e8ab620
Also change LMDB Cmake variables to CACHE rather than upgrading them through several parent scopes.
360 lines
6.4 KiB
C
360 lines
6.4 KiB
C
/** @file midl.c
|
|
* @brief ldap bdb back-end ID List functions */
|
|
/* $OpenLDAP$ */
|
|
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
|
|
*
|
|
* Copyright 2000-2014 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 <limits.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <sys/types.h>
|
|
#include "midl.h"
|
|
|
|
/** @defgroup internal LMDB Internals
|
|
* @{
|
|
*/
|
|
/** @defgroup idls ID List Management
|
|
* @{
|
|
*/
|
|
#define CMP(x,y) ( (x) < (y) ? -1 : (x) > (y) )
|
|
|
|
unsigned mdb_midl_search( MDB_IDL ids, MDB_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 = 1;
|
|
int val = 0;
|
|
unsigned n = ids[0];
|
|
|
|
while( 0 < n ) {
|
|
unsigned pivot = n >> 1;
|
|
cursor = base + pivot + 1;
|
|
val = CMP( ids[cursor], id );
|
|
|
|
if( val < 0 ) {
|
|
n = pivot;
|
|
|
|
} else if ( val > 0 ) {
|
|
base = cursor;
|
|
n -= pivot + 1;
|
|
|
|
} else {
|
|
return cursor;
|
|
}
|
|
}
|
|
|
|
if( val > 0 ) {
|
|
++cursor;
|
|
}
|
|
return cursor;
|
|
}
|
|
|
|
#if 0 /* superseded by append/sort */
|
|
int mdb_midl_insert( MDB_IDL ids, MDB_ID id )
|
|
{
|
|
unsigned x, i;
|
|
|
|
x = mdb_midl_search( ids, id );
|
|
assert( x > 0 );
|
|
|
|
if( x < 1 ) {
|
|
/* internal error */
|
|
return -2;
|
|
}
|
|
|
|
if ( x <= ids[0] && ids[x] == id ) {
|
|
/* duplicate */
|
|
assert(0);
|
|
return -1;
|
|
}
|
|
|
|
if ( ++ids[0] >= MDB_IDL_DB_MAX ) {
|
|
/* no room */
|
|
--ids[0];
|
|
return -2;
|
|
|
|
} else {
|
|
/* insert id */
|
|
for (i=ids[0]; i>x; i--)
|
|
ids[i] = ids[i-1];
|
|
ids[x] = id;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
MDB_IDL mdb_midl_alloc(int num)
|
|
{
|
|
MDB_IDL ids = malloc((num+2) * sizeof(MDB_ID));
|
|
if (ids) {
|
|
*ids++ = num;
|
|
*ids = 0;
|
|
}
|
|
return ids;
|
|
}
|
|
|
|
void mdb_midl_free(MDB_IDL ids)
|
|
{
|
|
if (ids)
|
|
free(ids-1);
|
|
}
|
|
|
|
int mdb_midl_shrink( MDB_IDL *idp )
|
|
{
|
|
MDB_IDL ids = *idp;
|
|
if (*(--ids) > MDB_IDL_UM_MAX &&
|
|
(ids = realloc(ids, (MDB_IDL_UM_MAX+1) * sizeof(MDB_ID))))
|
|
{
|
|
*ids++ = MDB_IDL_UM_MAX;
|
|
*idp = ids;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mdb_midl_grow( MDB_IDL *idp, int num )
|
|
{
|
|
MDB_IDL idn = *idp-1;
|
|
/* grow it */
|
|
idn = realloc(idn, (*idn + num + 2) * sizeof(MDB_ID));
|
|
if (!idn)
|
|
return ENOMEM;
|
|
*idn++ += num;
|
|
*idp = idn;
|
|
return 0;
|
|
}
|
|
|
|
int mdb_midl_need( MDB_IDL *idp, unsigned num )
|
|
{
|
|
MDB_IDL ids = *idp;
|
|
num += ids[0];
|
|
if (num > ids[-1]) {
|
|
num = (num + num/4 + (256 + 2)) & -256;
|
|
if (!(ids = realloc(ids-1, num * sizeof(MDB_ID))))
|
|
return ENOMEM;
|
|
*ids++ = num - 2;
|
|
*idp = ids;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int mdb_midl_append( MDB_IDL *idp, MDB_ID id )
|
|
{
|
|
MDB_IDL ids = *idp;
|
|
/* Too big? */
|
|
if (ids[0] >= ids[-1]) {
|
|
if (mdb_midl_grow(idp, MDB_IDL_UM_MAX))
|
|
return ENOMEM;
|
|
ids = *idp;
|
|
}
|
|
ids[0]++;
|
|
ids[ids[0]] = id;
|
|
return 0;
|
|
}
|
|
|
|
int mdb_midl_append_list( MDB_IDL *idp, MDB_IDL app )
|
|
{
|
|
MDB_IDL ids = *idp;
|
|
/* Too big? */
|
|
if (ids[0] + app[0] >= ids[-1]) {
|
|
if (mdb_midl_grow(idp, app[0]))
|
|
return ENOMEM;
|
|
ids = *idp;
|
|
}
|
|
memcpy(&ids[ids[0]+1], &app[1], app[0] * sizeof(MDB_ID));
|
|
ids[0] += app[0];
|
|
return 0;
|
|
}
|
|
|
|
int mdb_midl_append_range( MDB_IDL *idp, MDB_ID id, unsigned n )
|
|
{
|
|
MDB_ID *ids = *idp, len = ids[0];
|
|
/* Too big? */
|
|
if (len + n > ids[-1]) {
|
|
if (mdb_midl_grow(idp, n | MDB_IDL_UM_MAX))
|
|
return ENOMEM;
|
|
ids = *idp;
|
|
}
|
|
ids[0] = len + n;
|
|
ids += len;
|
|
while (n)
|
|
ids[n--] = id++;
|
|
return 0;
|
|
}
|
|
|
|
void mdb_midl_xmerge( MDB_IDL idl, MDB_IDL merge )
|
|
{
|
|
MDB_ID old_id, merge_id, i = merge[0], j = idl[0], k = i+j, total = k;
|
|
idl[0] = (MDB_ID)-1; /* delimiter for idl scan below */
|
|
old_id = idl[j];
|
|
while (i) {
|
|
merge_id = merge[i--];
|
|
for (; old_id < merge_id; old_id = idl[--j])
|
|
idl[k--] = old_id;
|
|
idl[k--] = merge_id;
|
|
}
|
|
idl[0] = total;
|
|
}
|
|
|
|
/* Quicksort + Insertion sort for small arrays */
|
|
|
|
#define SMALL 8
|
|
#define MIDL_SWAP(a,b) { itmp=(a); (a)=(b); (b)=itmp; }
|
|
|
|
void
|
|
mdb_midl_sort( MDB_IDL ids )
|
|
{
|
|
/* Max possible depth of int-indexed tree * 2 items/level */
|
|
int istack[sizeof(int)*CHAR_BIT * 2];
|
|
int i,j,k,l,ir,jstack;
|
|
MDB_ID a, itmp;
|
|
|
|
ir = (int)ids[0];
|
|
l = 1;
|
|
jstack = 0;
|
|
for(;;) {
|
|
if (ir - l < SMALL) { /* Insertion sort */
|
|
for (j=l+1;j<=ir;j++) {
|
|
a = ids[j];
|
|
for (i=j-1;i>=1;i--) {
|
|
if (ids[i] >= a) break;
|
|
ids[i+1] = ids[i];
|
|
}
|
|
ids[i+1] = a;
|
|
}
|
|
if (jstack == 0) break;
|
|
ir = istack[jstack--];
|
|
l = istack[jstack--];
|
|
} else {
|
|
k = (l + ir) >> 1; /* Choose median of left, center, right */
|
|
MIDL_SWAP(ids[k], ids[l+1]);
|
|
if (ids[l] < ids[ir]) {
|
|
MIDL_SWAP(ids[l], ids[ir]);
|
|
}
|
|
if (ids[l+1] < ids[ir]) {
|
|
MIDL_SWAP(ids[l+1], ids[ir]);
|
|
}
|
|
if (ids[l] < ids[l+1]) {
|
|
MIDL_SWAP(ids[l], ids[l+1]);
|
|
}
|
|
i = l+1;
|
|
j = ir;
|
|
a = ids[l+1];
|
|
for(;;) {
|
|
do i++; while(ids[i] > a);
|
|
do j--; while(ids[j] < a);
|
|
if (j < i) break;
|
|
MIDL_SWAP(ids[i],ids[j]);
|
|
}
|
|
ids[l+1] = ids[j];
|
|
ids[j] = a;
|
|
jstack += 2;
|
|
if (ir-i+1 >= j-l) {
|
|
istack[jstack] = ir;
|
|
istack[jstack-1] = i;
|
|
ir = j-1;
|
|
} else {
|
|
istack[jstack] = j-1;
|
|
istack[jstack-1] = l;
|
|
l = i;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
unsigned mdb_mid2l_search( MDB_ID2L ids, MDB_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 = 1;
|
|
int val = 0;
|
|
unsigned n = (unsigned)ids[0].mid;
|
|
|
|
while( 0 < n ) {
|
|
unsigned pivot = n >> 1;
|
|
cursor = base + pivot + 1;
|
|
val = CMP( id, ids[cursor].mid );
|
|
|
|
if( val < 0 ) {
|
|
n = pivot;
|
|
|
|
} else if ( val > 0 ) {
|
|
base = cursor;
|
|
n -= pivot + 1;
|
|
|
|
} else {
|
|
return cursor;
|
|
}
|
|
}
|
|
|
|
if( val > 0 ) {
|
|
++cursor;
|
|
}
|
|
return cursor;
|
|
}
|
|
|
|
int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id )
|
|
{
|
|
unsigned x, i;
|
|
|
|
x = mdb_mid2l_search( ids, id->mid );
|
|
|
|
if( x < 1 ) {
|
|
/* internal error */
|
|
return -2;
|
|
}
|
|
|
|
if ( x <= ids[0].mid && ids[x].mid == id->mid ) {
|
|
/* duplicate */
|
|
return -1;
|
|
}
|
|
|
|
if ( ids[0].mid >= MDB_IDL_UM_MAX ) {
|
|
/* too big */
|
|
return -2;
|
|
|
|
} else {
|
|
/* insert id */
|
|
ids[0].mid++;
|
|
for (i=(unsigned)ids[0].mid; i>x; i--)
|
|
ids[i] = ids[i-1];
|
|
ids[x] = *id;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id )
|
|
{
|
|
/* Too big? */
|
|
if (ids[0].mid >= MDB_IDL_UM_MAX) {
|
|
return -2;
|
|
}
|
|
ids[0].mid++;
|
|
ids[ids[0].mid] = *id;
|
|
return 0;
|
|
}
|
|
|
|
/** @} */
|
|
/** @} */
|