X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=servers%2Fslapd%2Fback-bdb%2Fidl.c;h=84629c10cf6e777a09059c966b5b96f990b1ecab;hb=5eb2836a5745b449fce398236416f6db80da6b1b;hp=fddb62d2354ba4ecd66857e5441c4cbeb4736262;hpb=b64782a7c058516198899a3cd8c5a50d30e08220;p=openldap
diff --git a/servers/slapd/back-bdb/idl.c b/servers/slapd/back-bdb/idl.c
index fddb62d235..84629c10cf 100644
--- a/servers/slapd/back-bdb/idl.c
+++ b/servers/slapd/back-bdb/idl.c
@@ -1,8 +1,17 @@
/* idl.c - ldap id list handling routines */
/* $OpenLDAP$ */
-/*
- * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
- * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
+/* This work is part of OpenLDAP Software .
+ *
+ * Copyright 2000-2006 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
+ * .
*/
#include "portable.h"
@@ -11,12 +20,94 @@
#include
#include "back-bdb.h"
+#include "idl.h"
+
+#define IDL_MAX(x,y) ( x > y ? x : y )
+#define IDL_MIN(x,y) ( x < y ? x : y )
#define IDL_CMP(x,y) ( x < y ? -1 : ( x > y ? 1 : 0 ) )
+#define IDL_LRU_DELETE( bdb, e ) do { \
+ if ( e->idl_lru_prev != NULL ) { \
+ e->idl_lru_prev->idl_lru_next = e->idl_lru_next; \
+ } else { \
+ bdb->bi_idl_lru_head = e->idl_lru_next; \
+ } \
+ if ( e->idl_lru_next != NULL ) { \
+ e->idl_lru_next->idl_lru_prev = e->idl_lru_prev; \
+ } else { \
+ bdb->bi_idl_lru_tail = e->idl_lru_prev; \
+ } \
+} while ( 0 )
+
+#define IDL_LRU_ADD( bdb, e ) do { \
+ e->idl_lru_next = bdb->bi_idl_lru_head; \
+ if ( e->idl_lru_next != NULL ) { \
+ e->idl_lru_next->idl_lru_prev = (e); \
+ } \
+ (bdb)->bi_idl_lru_head = (e); \
+ e->idl_lru_prev = NULL; \
+ if ( (bdb)->bi_idl_lru_tail == NULL ) { \
+ (bdb)->bi_idl_lru_tail = (e); \
+ } \
+} while ( 0 )
+
+static int
+bdb_idl_entry_cmp( const void *v_idl1, const void *v_idl2 )
+{
+ const bdb_idl_cache_entry_t *idl1 = v_idl1, *idl2 = v_idl2;
+ int rc;
+
+ if ((rc = SLAP_PTRCMP( idl1->db, idl2->db ))) return rc;
+ if ((rc = idl1->kstr.bv_len - idl2->kstr.bv_len )) return rc;
+ return ( memcmp ( idl1->kstr.bv_val, idl2->kstr.bv_val , idl1->kstr.bv_len ) );
+}
+
+#if IDL_DEBUG > 0
+static void idl_check( ID *ids )
+{
+ if( BDB_IDL_IS_RANGE( ids ) ) {
+ assert( BDB_IDL_RANGE_FIRST(ids) <= BDB_IDL_RANGE_LAST(ids) );
+ } else {
+ ID i;
+ for( i=1; i < ids[0]; i++ ) {
+ assert( ids[i+1] > ids[i] );
+ }
+ }
+}
+
+#if IDL_DEBUG > 1
+static void idl_dump( ID *ids )
+{
+ if( BDB_IDL_IS_RANGE( ids ) ) {
+ Debug( LDAP_DEBUG_ANY,
+ "IDL: range ( %ld - %ld )\n",
+ (long) BDB_IDL_RANGE_FIRST( ids ),
+ (long) BDB_IDL_RANGE_LAST( ids ) );
+
+ } else {
+ ID i;
+ Debug( LDAP_DEBUG_ANY, "IDL: size %ld", (long) ids[0], 0, 0 );
+
+ for( i=1; i<=ids[0]; i++ ) {
+ if( i % 16 == 1 ) {
+ Debug( LDAP_DEBUG_ANY, "\n", 0, 0, 0 );
+ }
+ Debug( LDAP_DEBUG_ANY, " %02lx", (long) ids[i], 0, 0 );
+ }
+
+ Debug( LDAP_DEBUG_ANY, "\n", 0, 0, 0 );
+ }
+
+ idl_check( ids );
+}
+#endif /* IDL_DEBUG > 1 */
+#endif /* IDL_DEBUG > 0 */
+
unsigned bdb_idl_search( ID *ids, ID id )
{
-#if BDB_IDL_BINARY_SEARCH
+#define IDL_BINARY_SEARCH 1
+#ifdef IDL_BINARY_SEARCH
/*
* binary search of id in ids
* if found, returns position of id
@@ -24,9 +115,13 @@ unsigned bdb_idl_search( ID *ids, ID id )
*/
unsigned base = 0;
unsigned cursor = 0;
- int val;
+ int val = 0;
unsigned n = ids[0];
+#if IDL_DEBUG > 0
+ idl_check( ids );
+#endif
+
while( 0 < n ) {
int pivot = n >> 1;
cursor = base + pivot;
@@ -53,19 +148,44 @@ unsigned bdb_idl_search( ID *ids, ID id )
#else
/* (reverse) linear search */
int i;
+
+#if IDL_DEBUG > 0
+ idl_check( ids );
+#endif
+
for( i=ids[0]; i; i-- ) {
if( id > ids[i] ) {
break;
}
}
+
return i+1;
#endif
}
-static int idl_insert( ID *ids, ID id )
+int bdb_idl_insert( ID *ids, ID id )
{
- unsigned x = bdb_idl_search( ids, id );
+ unsigned x;
+
+#if IDL_DEBUG > 1
+ Debug( LDAP_DEBUG_ANY, "insert: %04lx at %d\n", (long) id, x, 0 );
+ idl_dump( ids );
+#elif IDL_DEBUG > 0
+ idl_check( ids );
+#endif
+ if (BDB_IDL_IS_RANGE( ids )) {
+ /* if already in range, treat as a dup */
+ if (id >= BDB_IDL_FIRST(ids) && id <= BDB_IDL_LAST(ids))
+ return -1;
+ if (id < BDB_IDL_FIRST(ids))
+ ids[1] = id;
+ else if (id > BDB_IDL_LAST(ids))
+ ids[2] = id;
+ return 0;
+ }
+
+ x = bdb_idl_search( ids, id );
assert( x > 0 );
if( x < 1 ) {
@@ -92,17 +212,46 @@ static int idl_insert( ID *ids, ID id )
} else {
/* insert id */
AC_MEMCPY( &ids[x+1], &ids[x], (ids[0]-x) * sizeof(ID) );
- ids[0]++;
ids[x] = id;
}
+#if IDL_DEBUG > 1
+ idl_dump( ids );
+#elif IDL_DEBUG > 0
+ idl_check( ids );
+#endif
+
return 0;
}
-static int idl_delete( ID *ids, ID id )
+static int bdb_idl_delete( ID *ids, ID id )
{
- unsigned x = bdb_idl_search( ids, id );
+ unsigned x;
+
+#if IDL_DEBUG > 1
+ Debug( LDAP_DEBUG_ANY, "delete: %04lx at %d\n", (long) id, x, 0 );
+ idl_dump( ids );
+#elif IDL_DEBUG > 0
+ idl_check( ids );
+#endif
+
+ if (BDB_IDL_IS_RANGE( ids )) {
+ /* If deleting a range boundary, adjust */
+ if ( ids[1] == id )
+ ids[1]++;
+ else if ( ids[2] == id )
+ ids[2]--;
+ /* deleting from inside a range is a no-op */
+
+ /* If the range has collapsed, re-adjust */
+ if ( ids[1] > ids[2] )
+ ids[0] = 0;
+ else if ( ids[1] == ids[2] )
+ ids[1] = 1;
+ return 0;
+ }
+ x = bdb_idl_search( ids, id );
assert( x > 0 );
if( x <= 0 ) {
@@ -123,92 +272,611 @@ static int idl_delete( ID *ids, ID id )
AC_MEMCPY( &ids[x], &ids[x+1], (1+ids[0]-x) * sizeof(ID) );
}
+#if IDL_DEBUG > 1
+ idl_dump( ids );
+#elif IDL_DEBUG > 0
+ idl_check( ids );
+#endif
+
return 0;
}
+static char *
+bdb_show_key(
+ DBT *key,
+ char *buf )
+{
+ if ( key->size == 4 /* LUTIL_HASH_BYTES */ ) {
+ unsigned char *c = key->data;
+ sprintf( buf, "[%02x%02x%02x%02x]", c[0], c[1], c[2], c[3] );
+ return buf;
+ } else {
+ return key->data;
+ }
+}
+
+/* Find a db/key pair in the IDL cache. If ids is non-NULL,
+ * copy the cached IDL into it, otherwise just return the status.
+ */
int
-bdb_idl_insert_key(
+bdb_idl_cache_get(
+ struct bdb_info *bdb,
+ DB *db,
+ DBT *key,
+ ID *ids )
+{
+ bdb_idl_cache_entry_t idl_tmp;
+ bdb_idl_cache_entry_t *matched_idl_entry;
+ int rc = LDAP_NO_SUCH_OBJECT;
+
+ DBT2bv( key, &idl_tmp.kstr );
+ idl_tmp.db = db;
+ ldap_pvt_thread_rdwr_rlock( &bdb->bi_idl_tree_rwlock );
+ matched_idl_entry = avl_find( bdb->bi_idl_tree, &idl_tmp,
+ bdb_idl_entry_cmp );
+ if ( matched_idl_entry != NULL ) {
+ if ( matched_idl_entry->idl && ids )
+ BDB_IDL_CPY( ids, matched_idl_entry->idl );
+ ldap_pvt_thread_mutex_lock( &bdb->bi_idl_tree_lrulock );
+ IDL_LRU_DELETE( bdb, matched_idl_entry );
+ IDL_LRU_ADD( bdb, matched_idl_entry );
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_idl_tree_lrulock );
+ if ( matched_idl_entry->idl )
+ rc = LDAP_SUCCESS;
+ else
+ rc = DB_NOTFOUND;
+ }
+ ldap_pvt_thread_rdwr_runlock( &bdb->bi_idl_tree_rwlock );
+
+ return rc;
+}
+
+void
+bdb_idl_cache_put(
+ struct bdb_info *bdb,
+ DB *db,
+ DBT *key,
+ ID *ids,
+ int rc )
+{
+ bdb_idl_cache_entry_t idl_tmp;
+ bdb_idl_cache_entry_t *ee;
+
+ if ( rc == DB_NOTFOUND || BDB_IDL_IS_ZERO( ids ))
+ return;
+
+ DBT2bv( key, &idl_tmp.kstr );
+
+ ee = (bdb_idl_cache_entry_t *) ch_malloc(
+ sizeof( bdb_idl_cache_entry_t ) );
+ ee->db = db;
+ ee->idl = (ID*) ch_malloc( BDB_IDL_SIZEOF ( ids ) );
+ BDB_IDL_CPY( ee->idl, ids );
+
+ ee->idl_lru_prev = NULL;
+ ee->idl_lru_next = NULL;
+ ber_dupbv( &ee->kstr, &idl_tmp.kstr );
+ ldap_pvt_thread_rdwr_wlock( &bdb->bi_idl_tree_rwlock );
+ if ( avl_insert( &bdb->bi_idl_tree, (caddr_t) ee,
+ bdb_idl_entry_cmp, avl_dup_error ))
+ {
+ ch_free( ee->kstr.bv_val );
+ ch_free( ee->idl );
+ ch_free( ee );
+ ldap_pvt_thread_rdwr_wunlock( &bdb->bi_idl_tree_rwlock );
+ return;
+ }
+ ldap_pvt_thread_mutex_lock( &bdb->bi_idl_tree_lrulock );
+ IDL_LRU_ADD( bdb, ee );
+ if ( ++bdb->bi_idl_cache_size > bdb->bi_idl_cache_max_size ) {
+ int i = 0;
+ while ( bdb->bi_idl_lru_tail != NULL && i < 10 ) {
+ ee = bdb->bi_idl_lru_tail;
+ if ( avl_delete( &bdb->bi_idl_tree, (caddr_t) ee,
+ bdb_idl_entry_cmp ) == NULL ) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_cache_put: "
+ "AVL delete failed\n",
+ 0, 0, 0 );
+ }
+ IDL_LRU_DELETE( bdb, ee );
+ i++;
+ --bdb->bi_idl_cache_size;
+ ch_free( ee->kstr.bv_val );
+ ch_free( ee->idl );
+ ch_free( ee );
+ }
+ }
+
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_idl_tree_lrulock );
+ ldap_pvt_thread_rdwr_wunlock( &bdb->bi_idl_tree_rwlock );
+}
+
+void
+bdb_idl_cache_del(
+ struct bdb_info *bdb,
+ DB *db,
+ DBT *key )
+{
+ bdb_idl_cache_entry_t *matched_idl_entry, idl_tmp;
+ DBT2bv( key, &idl_tmp.kstr );
+ idl_tmp.db = db;
+ ldap_pvt_thread_rdwr_wlock( &bdb->bi_idl_tree_rwlock );
+ matched_idl_entry = avl_find( bdb->bi_idl_tree, &idl_tmp,
+ bdb_idl_entry_cmp );
+ if ( matched_idl_entry != NULL ) {
+ if ( avl_delete( &bdb->bi_idl_tree, (caddr_t) matched_idl_entry,
+ bdb_idl_entry_cmp ) == NULL ) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_cache_del: "
+ "AVL delete failed\n",
+ 0, 0, 0 );
+ }
+ --bdb->bi_idl_cache_size;
+ ldap_pvt_thread_mutex_lock( &bdb->bi_idl_tree_lrulock );
+ IDL_LRU_DELETE( bdb, matched_idl_entry );
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_idl_tree_lrulock );
+ free( matched_idl_entry->kstr.bv_val );
+ if ( matched_idl_entry->idl )
+ free( matched_idl_entry->idl );
+ free( matched_idl_entry );
+ }
+ ldap_pvt_thread_rdwr_wunlock( &bdb->bi_idl_tree_rwlock );
+}
+
+void
+bdb_idl_cache_add_id(
+ struct bdb_info *bdb,
+ DB *db,
+ DBT *key,
+ ID id )
+{
+ bdb_idl_cache_entry_t *cache_entry, idl_tmp;
+ DBT2bv( key, &idl_tmp.kstr );
+ idl_tmp.db = db;
+ ldap_pvt_thread_rdwr_wlock( &bdb->bi_idl_tree_rwlock );
+ cache_entry = avl_find( bdb->bi_idl_tree, &idl_tmp,
+ bdb_idl_entry_cmp );
+ if ( cache_entry != NULL ) {
+ if ( !BDB_IDL_IS_RANGE( cache_entry->idl ) &&
+ cache_entry->idl[0] < BDB_IDL_DB_MAX ) {
+ size_t s = BDB_IDL_SIZEOF( cache_entry->idl ) + sizeof(ID);
+ cache_entry->idl = ch_realloc( cache_entry->idl, s );
+ }
+ bdb_idl_insert( cache_entry->idl, id );
+ }
+ ldap_pvt_thread_rdwr_wunlock( &bdb->bi_idl_tree_rwlock );
+}
+
+void
+bdb_idl_cache_del_id(
+ struct bdb_info *bdb,
+ DB *db,
+ DBT *key,
+ ID id )
+{
+ bdb_idl_cache_entry_t *cache_entry, idl_tmp;
+ DBT2bv( key, &idl_tmp.kstr );
+ idl_tmp.db = db;
+ ldap_pvt_thread_rdwr_wlock( &bdb->bi_idl_tree_rwlock );
+ cache_entry = avl_find( bdb->bi_idl_tree, &idl_tmp,
+ bdb_idl_entry_cmp );
+ if ( cache_entry != NULL ) {
+ bdb_idl_delete( cache_entry->idl, id );
+ if ( cache_entry->idl[0] == 0 ) {
+ if ( avl_delete( &bdb->bi_idl_tree, (caddr_t) cache_entry,
+ bdb_idl_entry_cmp ) == NULL ) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_cache_del: "
+ "AVL delete failed\n",
+ 0, 0, 0 );
+ }
+ --bdb->bi_idl_cache_size;
+ ldap_pvt_thread_mutex_lock( &bdb->bi_idl_tree_lrulock );
+ IDL_LRU_DELETE( bdb, cache_entry );
+ ldap_pvt_thread_mutex_unlock( &bdb->bi_idl_tree_lrulock );
+ free( cache_entry->kstr.bv_val );
+ if ( cache_entry->idl )
+ free( cache_entry->idl );
+ free( cache_entry );
+ }
+ }
+ ldap_pvt_thread_rdwr_wunlock( &bdb->bi_idl_tree_rwlock );
+}
+
+int
+bdb_idl_fetch_key(
BackendDB *be,
DB *db,
DB_TXN *tid,
DBT *key,
- ID id )
+ ID *ids,
+ DBC **saved_cursor,
+ int get_flag )
{
- int rc;
- ID ids[BDB_IDL_DB_SIZE];
- DBT data;
+ struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+ int rc;
+ DBT data, key2, *kptr;
+ DBC *cursor;
+ ID *i;
+ void *ptr;
+ size_t len;
+ int rc2;
+ int flags = bdb->bi_db_opflags | DB_MULTIPLE;
+ int opflag;
+
+ /* If using BerkeleyDB 4.0, the buf must be large enough to
+ * grab the entire IDL in one get(), otherwise BDB will leak
+ * resources on subsequent get's. We can safely call get()
+ * twice - once for the data, and once to get the DB_NOTFOUND
+ * result meaning there's no more data. See ITS#2040 for details.
+ * This bug is fixed in BDB 4.1 so a smaller buffer will work if
+ * stack space is too limited.
+ *
+ * configure now requires Berkeley DB 4.1.
+ */
+#if DB_VERSION_FULL < 0x04010000
+# define BDB_ENOUGH 5
+#else
+ /* We sometimes test with tiny IDLs, and BDB always wants buffers
+ * that are at least one page in size.
+ */
+# if BDB_IDL_DB_SIZE < 4096
+# define BDB_ENOUGH 2048
+# else
+# define BDB_ENOUGH 1
+# endif
+#endif
+ ID buf[BDB_IDL_DB_SIZE*BDB_ENOUGH];
+
+ char keybuf[16];
- /* for printable keys only */
Debug( LDAP_DEBUG_ARGS,
- "=> bdb_idl_insert_key: %s %ld\n",
- key->data, (long) id, 0 );
+ "bdb_idl_fetch_key: %s\n",
+ bdb_show_key( key, keybuf ), 0, 0 );
- assert( id != NOID );
+ assert( ids != NULL );
+
+ if ( saved_cursor && *saved_cursor ) {
+ opflag = DB_NEXT;
+ } else if ( get_flag == LDAP_FILTER_GE ) {
+ opflag = DB_SET_RANGE;
+ } else if ( get_flag == LDAP_FILTER_LE ) {
+ opflag = DB_FIRST;
+ } else {
+ opflag = DB_SET;
+ }
+
+ /* only non-range lookups can use the IDL cache */
+ if ( bdb->bi_idl_cache_size && opflag == DB_SET ) {
+ rc = bdb_idl_cache_get( bdb, db, key, ids );
+ if ( rc != LDAP_NO_SUCH_OBJECT ) return rc;
+ }
+
+ DBTzero( &data );
- data.data = ids;
- data.ulen = sizeof( ids );
+ data.data = buf;
+ data.ulen = sizeof(buf);
data.flags = DB_DBT_USERMEM;
- /* fetch the key and grab a write lock */
- rc = db->get( db, tid, key, &data, DB_RMW );
+ /* If we're not reusing an existing cursor, get a new one */
+ if( opflag != DB_NEXT ) {
+ rc = db->cursor( db, tid, &cursor, bdb->bi_db_opflags );
+ if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
+ "cursor failed: %s (%d)\n", db_strerror(rc), rc, 0 );
+ return rc;
+ }
+ } else {
+ cursor = *saved_cursor;
+ }
+
+ /* If this is a LE lookup, save original key so we can determine
+ * when to stop. If this is a GE lookup, save the key since it
+ * will be overwritten.
+ */
+ if ( get_flag == LDAP_FILTER_LE || get_flag == LDAP_FILTER_GE ) {
+ DBTzero( &key2 );
+ key2.flags = DB_DBT_USERMEM;
+ key2.ulen = sizeof(keybuf);
+ key2.data = keybuf;
+ key2.size = key->size;
+ AC_MEMCPY( keybuf, key->data, key->size );
+ kptr = &key2;
+ } else {
+ kptr = key;
+ }
+ len = key->size;
+ rc = cursor->c_get( cursor, kptr, &data, flags | opflag );
+
+ /* skip presence key on range inequality lookups */
+ while (rc == 0 && kptr->size != len) {
+ rc = cursor->c_get( cursor, kptr, &data, flags | DB_NEXT_NODUP );
+ }
+ /* If we're doing a LE compare and the new key is greater than
+ * our search key, we're done
+ */
+ if (rc == 0 && get_flag == LDAP_FILTER_LE && memcmp( kptr->data,
+ key->data, key->size ) > 0 ) {
+ rc = DB_NOTFOUND;
+ }
+ if (rc == 0) {
+ i = ids;
+ while (rc == 0) {
+ u_int8_t *j;
+
+ DB_MULTIPLE_INIT( ptr, &data );
+ while (ptr) {
+ DB_MULTIPLE_NEXT(ptr, &data, j, len);
+ if (j) {
+ ++i;
+ BDB_DISK2ID( j, i );
+ }
+ }
+ rc = cursor->c_get( cursor, key, &data, flags | DB_NEXT_DUP );
+ }
+ if ( rc == DB_NOTFOUND ) rc = 0;
+ ids[0] = i - ids;
+ /* On disk, a range is denoted by 0 in the first element */
+ if (ids[1] == 0) {
+ if (ids[0] != BDB_IDL_RANGE_SIZE) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
+ "range size mismatch: expected %d, got %ld\n",
+ BDB_IDL_RANGE_SIZE, ids[0], 0 );
+ cursor->c_close( cursor );
+ return -1;
+ }
+ BDB_IDL_RANGE( ids, ids[2], ids[3] );
+ }
+ data.size = BDB_IDL_SIZEOF(ids);
+ }
+
+ if ( saved_cursor && rc == 0 ) {
+ if ( !*saved_cursor )
+ *saved_cursor = cursor;
+ rc2 = 0;
+ }
+ else
+ rc2 = cursor->c_close( cursor );
+ if (rc2) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
+ "close failed: %s (%d)\n", db_strerror(rc2), rc2, 0 );
+ return rc2;
+ }
if( rc == DB_NOTFOUND ) {
- ids[0] = 1;
- ids[1] = id;
- data.size = 2 * sizeof( ID );
+ return rc;
- } else if ( rc != 0 ) {
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_insert_key: get failed: %s (%d)\n",
+ } else if( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
+ "get failed: %s (%d)\n",
db_strerror(rc), rc, 0 );
return rc;
} else if ( data.size == 0 || data.size % sizeof( ID ) ) {
/* size not multiple of ID size */
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_insert_key: odd size: expected %ld multiple, got %ld\n",
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
+ "odd size: expected %ld multiple, got %ld\n",
(long) sizeof( ID ), (long) data.size, 0 );
return -1;
-
- } else if ( BDB_IDL_IS_RANGE(ids) ) {
- if( id < ids[1] ) {
- ids[1] = id;
- } else if ( ids[2] > id ) {
- ids[2] = id;
- } else {
- return 0;
- }
- } else if ( data.size != (1 + ids[0]) * sizeof( ID ) ) {
+ } else if ( data.size != BDB_IDL_SIZEOF(ids) ) {
/* size mismatch */
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_insert_key: get size mismatch: expected %ld, got %ld\n",
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
+ "get size mismatch: expected %ld, got %ld\n",
(long) ((1 + ids[0]) * sizeof( ID )), (long) data.size, 0 );
return -1;
+ }
- } else {
- rc = idl_insert( ids, id );
+ if ( bdb->bi_idl_cache_max_size ) {
+ bdb_idl_cache_put( bdb, db, key, ids, rc );
+ }
- if( rc != 0 ) {
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_insert_key: idl_insert failed (%d)\n",
- rc, 0, 0 );
- return rc;
- }
+ return rc;
+}
- if( BDB_IDL_IS_RANGE( ids ) ) {
- data.size = BDB_IDL_RANGE_SIZE;
- } else {
- data.size = (ids[0]+1) * sizeof( ID );
- }
+
+int
+bdb_idl_insert_key(
+ BackendDB *be,
+ DB *db,
+ DB_TXN *tid,
+ DBT *key,
+ ID id )
+{
+ struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+ int rc;
+ DBT data;
+ DBC *cursor;
+ ID lo, hi, nlo, nhi, nid;
+ char *err;
+
+ {
+ char buf[16];
+ Debug( LDAP_DEBUG_ARGS,
+ "bdb_idl_insert_key: %lx %s\n",
+ (long) id, bdb_show_key( key, buf ), 0 );
+ }
+
+ assert( id != NOID );
+
+ if ( bdb->bi_idl_cache_size ) {
+ bdb_idl_cache_del( bdb, db, key );
+ }
+
+ DBTzero( &data );
+ data.size = sizeof( ID );
+ data.ulen = data.size;
+ data.flags = DB_DBT_USERMEM;
+
+ BDB_ID2DISK( id, &nid );
+
+ rc = db->cursor( db, tid, &cursor, bdb->bi_db_opflags );
+ if ( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_insert_key: "
+ "cursor failed: %s (%d)\n", db_strerror(rc), rc, 0 );
+ return rc;
}
+ data.data = &nlo;
+ /* Fetch the first data item for this key, to see if it
+ * exists and if it's a range.
+ */
+ rc = cursor->c_get( cursor, key, &data, DB_SET );
+ err = "c_get";
+ if ( rc == 0 ) {
+ if ( nlo != 0 ) {
+ /* not a range, count the number of items */
+ db_recno_t count;
+ rc = cursor->c_count( cursor, &count, 0 );
+ if ( rc != 0 ) {
+ err = "c_count";
+ goto fail;
+ }
+ if ( count >= BDB_IDL_DB_MAX ) {
+ /* No room, convert to a range */
+ DBT key2 = *key;
+ db_recno_t i;
+
+ key2.dlen = key2.ulen;
+ key2.flags |= DB_DBT_PARTIAL;
- /* store the key */
- rc = db->put( db, tid, key, &data, 0 );
+ BDB_DISK2ID( &nlo, &lo );
+ data.data = &nhi;
+ rc = cursor->c_get( cursor, &key2, &data, DB_NEXT_NODUP );
+ if ( rc != 0 && rc != DB_NOTFOUND ) {
+ err = "c_get next_nodup";
+ goto fail;
+ }
+ if ( rc == DB_NOTFOUND ) {
+ rc = cursor->c_get( cursor, key, &data, DB_LAST );
+ if ( rc != 0 ) {
+ err = "c_get last";
+ goto fail;
+ }
+ } else {
+ rc = cursor->c_get( cursor, key, &data, DB_PREV );
+ if ( rc != 0 ) {
+ err = "c_get prev";
+ goto fail;
+ }
+ }
+ BDB_DISK2ID( &nhi, &hi );
+ /* Update hi/lo if needed, then delete all the items
+ * between lo and hi
+ */
+ if ( id < lo ) {
+ lo = id;
+ nlo = nid;
+ } else if ( id > hi ) {
+ hi = id;
+ nhi = nid;
+ }
+ data.data = &nid;
+ /* Don't fetch anything, just position cursor */
+ data.flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;
+ data.dlen = data.ulen = 0;
+ rc = cursor->c_get( cursor, key, &data, DB_SET );
+ if ( rc != 0 ) {
+ err = "c_get 2";
+ goto fail;
+ }
+ rc = cursor->c_del( cursor, 0 );
+ if ( rc != 0 ) {
+ err = "c_del range1";
+ goto fail;
+ }
+ /* Delete all the records */
+ for ( i=1; ic_get( cursor, &key2, &data, DB_NEXT_DUP );
+ if ( rc != 0 ) {
+ err = "c_get next_dup";
+ goto fail;
+ }
+ rc = cursor->c_del( cursor, 0 );
+ if ( rc != 0 ) {
+ err = "c_del range";
+ goto fail;
+ }
+ }
+ /* Store the range marker */
+ data.size = data.ulen = sizeof(ID);
+ data.flags = DB_DBT_USERMEM;
+ nid = 0;
+ rc = cursor->c_put( cursor, key, &data, DB_KEYFIRST );
+ if ( rc != 0 ) {
+ err = "c_put range";
+ goto fail;
+ }
+ nid = nlo;
+ rc = cursor->c_put( cursor, key, &data, DB_KEYLAST );
+ if ( rc != 0 ) {
+ err = "c_put lo";
+ goto fail;
+ }
+ nid = nhi;
+ rc = cursor->c_put( cursor, key, &data, DB_KEYLAST );
+ if ( rc != 0 ) {
+ err = "c_put hi";
+ goto fail;
+ }
+ } else {
+ /* There's room, just store it */
+ goto put1;
+ }
+ } else {
+ /* It's a range, see if we need to rewrite
+ * the boundaries
+ */
+ hi = id;
+ data.data = &nlo;
+ rc = cursor->c_get( cursor, key, &data, DB_NEXT_DUP );
+ if ( rc != 0 ) {
+ err = "c_get lo";
+ goto fail;
+ }
+ BDB_DISK2ID( &nlo, &lo );
+ if ( id > lo ) {
+ data.data = &nhi;
+ rc = cursor->c_get( cursor, key, &data, DB_NEXT_DUP );
+ if ( rc != 0 ) {
+ err = "c_get hi";
+ goto fail;
+ }
+ BDB_DISK2ID( &nhi, &hi );
+ }
+ if ( id < lo || id > hi ) {
+ /* Delete the current lo/hi */
+ rc = cursor->c_del( cursor, 0 );
+ if ( rc != 0 ) {
+ err = "c_del";
+ goto fail;
+ }
+ data.data = &nid;
+ rc = cursor->c_put( cursor, key, &data, DB_KEYFIRST );
+ if ( rc != 0 ) {
+ err = "c_put lo/hi";
+ goto fail;
+ }
+ }
+ }
+ } else if ( rc == DB_NOTFOUND ) {
+put1: data.data = &nid;
+ rc = cursor->c_put( cursor, key, &data, DB_NODUPDATA );
+ /* Don't worry if it's already there */
+ if ( rc != 0 && rc != DB_KEYEXIST ) {
+ err = "c_put id";
+ goto fail;
+ }
+ } else {
+ /* initial c_get failed, nothing was done */
+fail:
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_insert_key: "
+ "%s failed: %s (%d)\n", err, db_strerror(rc), rc );
+ cursor->c_close( cursor );
+ return rc;
+ }
+ rc = cursor->c_close( cursor );
if( rc != 0 ) {
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_insert_key: get failed: %s (%d)\n",
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_insert_key: "
+ "c_close failed: %s (%d)\n",
db_strerror(rc), rc, 0 );
}
return rc;
@@ -222,79 +890,666 @@ bdb_idl_delete_key(
DBT *key,
ID id )
{
+ struct bdb_info *bdb = (struct bdb_info *) be->be_private;
int rc;
- ID ids[BDB_IDL_DB_SIZE];
DBT data;
+ DBC *cursor;
+ ID lo, hi, tmp, nid, nlo, nhi;
+ char *err;
- /* for printable keys only */
- Debug( LDAP_DEBUG_ARGS,
- "=> bdb_idl_delete_key: %s %ld\n",
- key->data, (long) id, 0 );
-
+ {
+ char buf[16];
+ Debug( LDAP_DEBUG_ARGS,
+ "bdb_idl_delete_key: %lx %s\n",
+ (long) id, bdb_show_key( key, buf ), 0 );
+ }
assert( id != NOID );
- data.data = ids;
- data.ulen = sizeof( ids );
- data.flags = DB_DBT_USERMEM;
+ if ( bdb->bi_idl_cache_max_size ) {
+ bdb_idl_cache_del( bdb, db, key );
+ }
- /* fetch the key and grab a write lock */
- rc = db->get( db, tid, key, &data, DB_RMW );
+ BDB_ID2DISK( id, &nid );
+ DBTzero( &data );
+ data.data = &tmp;
+ data.size = sizeof( id );
+ data.ulen = data.size;
+ data.flags = DB_DBT_USERMEM;
+
+ rc = db->cursor( db, tid, &cursor, bdb->bi_db_opflags );
if ( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_delete_key: "
+ "cursor failed: %s (%d)\n", db_strerror(rc), rc, 0 );
+ return rc;
+ }
+ /* Fetch the first data item for this key, to see if it
+ * exists and if it's a range.
+ */
+ rc = cursor->c_get( cursor, key, &data, DB_SET );
+ err = "c_get";
+ if ( rc == 0 ) {
+ if ( tmp != 0 ) {
+ /* Not a range, just delete it */
+ if (tmp != nid) {
+ /* position to correct item */
+ tmp = nid;
+ rc = cursor->c_get( cursor, key, &data, DB_GET_BOTH );
+ if ( rc != 0 ) {
+ err = "c_get id";
+ goto fail;
+ }
+ }
+ rc = cursor->c_del( cursor, 0 );
+ if ( rc != 0 ) {
+ err = "c_del id";
+ goto fail;
+ }
+ } else {
+ /* It's a range, see if we need to rewrite
+ * the boundaries
+ */
+ data.data = &nlo;
+ rc = cursor->c_get( cursor, key, &data, DB_NEXT_DUP );
+ if ( rc != 0 ) {
+ err = "c_get lo";
+ goto fail;
+ }
+ BDB_DISK2ID( &nlo, &lo );
+ data.data = &nhi;
+ rc = cursor->c_get( cursor, key, &data, DB_NEXT_DUP );
+ if ( rc != 0 ) {
+ err = "c_get hi";
+ goto fail;
+ }
+ BDB_DISK2ID( &nhi, &hi );
+ if ( id == lo || id == hi ) {
+ if ( id == lo ) {
+ id++;
+ lo = id;
+ } else if ( id == hi ) {
+ id--;
+ hi = id;
+ }
+ if ( lo >= hi ) {
+ /* The range has collapsed... */
+ rc = db->del( db, tid, key, 0 );
+ if ( rc != 0 ) {
+ err = "del";
+ goto fail;
+ }
+ } else {
+ if ( id == lo ) {
+ /* reposition on lo slot */
+ data.data = &nlo;
+ cursor->c_get( cursor, key, &data, DB_PREV );
+ }
+ rc = cursor->c_del( cursor, 0 );
+ if ( rc != 0 ) {
+ err = "c_del";
+ goto fail;
+ }
+ }
+ if ( lo <= hi ) {
+ BDB_ID2DISK( id, &nid );
+ data.data = &nid;
+ rc = cursor->c_put( cursor, key, &data, DB_KEYFIRST );
+ if ( rc != 0 ) {
+ err = "c_put lo/hi";
+ goto fail;
+ }
+ }
+ }
+ }
+ } else {
+ /* initial c_get failed, nothing was done */
+fail:
+ if ( rc != DB_NOTFOUND ) {
+ Debug( LDAP_DEBUG_ANY, "=> bdb_idl_delete_key: "
+ "%s failed: %s (%d)\n", err, db_strerror(rc), rc );
+ }
+ cursor->c_close( cursor );
+ return rc;
+ }
+ rc = cursor->c_close( cursor );
+ if( rc != 0 ) {
Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_delete_key: get failed: %s (%d)\n",
+ "=> bdb_idl_delete_key: c_close failed: %s (%d)\n",
db_strerror(rc), rc, 0 );
- return rc;
+ }
- } else if ( data.size == 0 || data.size % sizeof( ID ) ) {
- /* size not multiple of ID size */
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_delete_key: odd size: expected %ld multiple, got %ld\n",
- (long) sizeof( ID ), (long) data.size, 0 );
- return -1;
-
- } else if ( BDB_IDL_IS_RANGE(ids) ) {
+ return rc;
+}
+
+
+/*
+ * idl_intersection - return a = a intersection b
+ */
+int
+bdb_idl_intersection(
+ ID *a,
+ ID *b )
+{
+ ID ida, idb;
+ ID idmax, idmin;
+ ID cursora = 0, cursorb = 0, cursorc;
+ int swap = 0;
+
+ if ( BDB_IDL_IS_ZERO( a ) || BDB_IDL_IS_ZERO( b ) ) {
+ a[0] = 0;
return 0;
+ }
- } else if ( data.size != (1 + ids[0]) * sizeof( ID ) ) {
- /* size mismatch */
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_delete_key: get size mismatch: expected %ld, got %ld\n",
- (long) ((1 + ids[0]) * sizeof( ID )), (long) data.size, 0 );
- return -1;
+ idmin = IDL_MAX( BDB_IDL_FIRST(a), BDB_IDL_FIRST(b) );
+ idmax = IDL_MIN( BDB_IDL_LAST(a), BDB_IDL_LAST(b) );
+ if ( idmin > idmax ) {
+ a[0] = 0;
+ return 0;
+ } else if ( idmin == idmax ) {
+ a[0] = 1;
+ a[1] = idmin;
+ return 0;
+ }
- } else {
- rc = idl_delete( ids, id );
+ if ( BDB_IDL_IS_RANGE( a ) ) {
+ if ( BDB_IDL_IS_RANGE(b) ) {
+ /* If both are ranges, just shrink the boundaries */
+ a[1] = idmin;
+ a[2] = idmax;
+ return 0;
+ } else {
+ /* Else swap so that b is the range, a is a list */
+ ID *tmp = a;
+ a = b;
+ b = tmp;
+ swap = 1;
+ }
+ }
- if( rc != 0 ) {
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_delete_key: idl_delete failed (%d)\n",
- rc, 0, 0 );
- return rc;
+ /* If a range completely covers the list, the result is
+ * just the list. If idmin to idmax is contiguous, just
+ * turn it into a range.
+ */
+ if ( BDB_IDL_IS_RANGE( b )
+ && BDB_IDL_FIRST( b ) <= BDB_IDL_FIRST( a )
+ && BDB_IDL_LAST( b ) >= BDB_IDL_LAST( a ) ) {
+ if (idmax - idmin + 1 == a[0])
+ {
+ a[0] = NOID;
+ a[1] = idmin;
+ a[2] = idmax;
}
+ goto done;
+ }
+
+ /* Fine, do the intersection one element at a time.
+ * First advance to idmin in both IDLs.
+ */
+ cursora = cursorb = idmin;
+ ida = bdb_idl_first( a, &cursora );
+ idb = bdb_idl_first( b, &cursorb );
+ cursorc = 0;
- if( ids[0] == 0 ) {
- /* delete the key */
- rc = db->del( db, tid, key, 0 );
- if( rc != 0 ) {
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_delete_key: delete failed: %s (%d)\n",
- db_strerror(rc), rc, 0 );
+ while( ida <= idmax || idb <= idmax ) {
+ if( ida == idb ) {
+ a[++cursorc] = ida;
+ ida = bdb_idl_next( a, &cursora );
+ idb = bdb_idl_next( b, &cursorb );
+ } else if ( ida < idb ) {
+ ida = bdb_idl_next( a, &cursora );
+ } else {
+ idb = bdb_idl_next( b, &cursorb );
+ }
+ }
+ a[0] = cursorc;
+done:
+ if (swap)
+ BDB_IDL_CPY( b, a );
+
+ return 0;
+}
+
+
+/*
+ * idl_union - return a = a union b
+ */
+int
+bdb_idl_union(
+ ID *a,
+ ID *b )
+{
+ ID ida, idb;
+ ID cursora = 0, cursorb = 0, cursorc;
+
+ if ( BDB_IDL_IS_ZERO( b ) ) {
+ return 0;
+ }
+
+ if ( BDB_IDL_IS_ZERO( a ) ) {
+ BDB_IDL_CPY( a, b );
+ return 0;
+ }
+
+ if ( BDB_IDL_IS_RANGE( a ) || BDB_IDL_IS_RANGE(b) ) {
+over: ida = IDL_MIN( BDB_IDL_FIRST(a), BDB_IDL_FIRST(b) );
+ idb = IDL_MAX( BDB_IDL_LAST(a), BDB_IDL_LAST(b) );
+ a[0] = NOID;
+ a[1] = ida;
+ a[2] = idb;
+ return 0;
+ }
+
+ ida = bdb_idl_first( a, &cursora );
+ idb = bdb_idl_first( b, &cursorb );
+
+ cursorc = b[0];
+
+ /* The distinct elements of a are cat'd to b */
+ while( ida != NOID || idb != NOID ) {
+ if ( ida < idb ) {
+ if( ++cursorc > BDB_IDL_UM_MAX ) {
+ goto over;
}
- return rc;
+ b[cursorc] = ida;
+ ida = bdb_idl_next( a, &cursora );
+
+ } else {
+ if ( ida == idb )
+ ida = bdb_idl_next( a, &cursora );
+ idb = bdb_idl_next( b, &cursorb );
}
+ }
- data.size = (ids[0]+1) * sizeof( ID );
+ /* b is copied back to a in sorted order */
+ a[0] = cursorc;
+ cursora = 1;
+ cursorb = 1;
+ cursorc = b[0]+1;
+ while (cursorb <= b[0] || cursorc <= a[0]) {
+ if (cursorc > a[0])
+ idb = NOID;
+ else
+ idb = b[cursorc];
+ if (cursorb <= b[0] && b[cursorb] < idb)
+ a[cursora++] = b[cursorb++];
+ else {
+ a[cursora++] = idb;
+ cursorc++;
+ }
}
- /* store the key */
- rc = db->put( db, tid, key, &data, 0 );
+ return 0;
+}
- if( rc != 0 ) {
- Debug( LDAP_DEBUG_ANY,
- "=> bdb_idl_delete_key: put failed: %s (%d)\n",
- db_strerror(rc), rc, 0 );
+
+#if 0
+/*
+ * bdb_idl_notin - return a intersection ~b (or a minus b)
+ */
+int
+bdb_idl_notin(
+ ID *a,
+ ID *b,
+ ID *ids )
+{
+ ID ida, idb;
+ ID cursora = 0, cursorb = 0;
+
+ if( BDB_IDL_IS_ZERO( a ) ||
+ BDB_IDL_IS_ZERO( b ) ||
+ BDB_IDL_IS_RANGE( b ) )
+ {
+ BDB_IDL_CPY( ids, a );
+ return 0;
}
- return rc;
+ if( BDB_IDL_IS_RANGE( a ) ) {
+ BDB_IDL_CPY( ids, a );
+ return 0;
+ }
+
+ ida = bdb_idl_first( a, &cursora ),
+ idb = bdb_idl_first( b, &cursorb );
+
+ ids[0] = 0;
+
+ while( ida != NOID ) {
+ if ( idb == NOID ) {
+ /* we could shortcut this */
+ ids[++ids[0]] = ida;
+ ida = bdb_idl_next( a, &cursora );
+
+ } else if ( ida < idb ) {
+ ids[++ids[0]] = ida;
+ ida = bdb_idl_next( a, &cursora );
+
+ } else if ( ida > idb ) {
+ idb = bdb_idl_next( b, &cursorb );
+
+ } else {
+ ida = bdb_idl_next( a, &cursora );
+ idb = bdb_idl_next( b, &cursorb );
+ }
+ }
+
+ return 0;
+}
+#endif
+
+ID bdb_idl_first( ID *ids, ID *cursor )
+{
+ ID pos;
+
+ if ( ids[0] == 0 ) {
+ *cursor = NOID;
+ return NOID;
+ }
+
+ if ( BDB_IDL_IS_RANGE( ids ) ) {
+ if( *cursor < ids[1] ) {
+ *cursor = ids[1];
+ }
+ return *cursor;
+ }
+
+ if ( *cursor == 0 )
+ pos = 1;
+ else
+ pos = bdb_idl_search( ids, *cursor );
+
+ if( pos > ids[0] ) {
+ return NOID;
+ }
+
+ *cursor = pos;
+ return ids[pos];
}
+
+ID bdb_idl_next( ID *ids, ID *cursor )
+{
+ if ( BDB_IDL_IS_RANGE( ids ) ) {
+ if( ids[2] < ++(*cursor) ) {
+ return NOID;
+ }
+ return *cursor;
+ }
+
+ if ( ++(*cursor) <= ids[0] ) {
+ return ids[*cursor];
+ }
+
+ return NOID;
+}
+
+#ifdef BDB_HIER
+
+/* Add one ID to an unsorted list. We ensure that the first element is the
+ * minimum and the last element is the maximum, for fast range compaction.
+ * this means IDLs up to length 3 are always sorted...
+ */
+int bdb_idl_append_one( ID *ids, ID id )
+{
+ if (BDB_IDL_IS_RANGE( ids )) {
+ /* if already in range, treat as a dup */
+ if (id >= BDB_IDL_FIRST(ids) && id <= BDB_IDL_LAST(ids))
+ return -1;
+ if (id < BDB_IDL_FIRST(ids))
+ ids[1] = id;
+ else if (id > BDB_IDL_LAST(ids))
+ ids[2] = id;
+ return 0;
+ }
+ if ( ids[0] ) {
+ ID tmp;
+
+ if (id < ids[1]) {
+ tmp = ids[1];
+ ids[1] = id;
+ id = tmp;
+ }
+ if ( ids[0] > 1 && id < ids[ids[0]] ) {
+ tmp = ids[ids[0]];
+ ids[ids[0]] = id;
+ id = tmp;
+ }
+ }
+ ids[0]++;
+ if ( ids[0] >= BDB_IDL_UM_MAX ) {
+ ids[0] = NOID;
+ ids[2] = id;
+ } else {
+ ids[ids[0]] = id;
+ }
+ return 0;
+}
+
+/* Append sorted list b to sorted list a. The result is unsorted but
+ * a[1] is the min of the result and a[a[0]] is the max.
+ */
+int bdb_idl_append( ID *a, ID *b )
+{
+ ID ida, idb, tmp, swap = 0;
+
+ if ( BDB_IDL_IS_ZERO( b ) ) {
+ return 0;
+ }
+
+ if ( BDB_IDL_IS_ZERO( a ) ) {
+ BDB_IDL_CPY( a, b );
+ return 0;
+ }
+
+ ida = BDB_IDL_LAST( a );
+ idb = BDB_IDL_LAST( b );
+ if ( BDB_IDL_IS_RANGE( a ) || BDB_IDL_IS_RANGE(b) ||
+ a[0] + b[0] >= BDB_IDL_UM_MAX ) {
+ a[2] = IDL_MAX( ida, idb );
+ a[1] = IDL_MIN( a[1], b[1] );
+ a[0] = NOID;
+ return 0;
+ }
+
+ if ( b[0] > 1 && ida > idb ) {
+ swap = idb;
+ a[a[0]] = idb;
+ b[b[0]] = ida;
+ }
+
+ if ( b[1] < a[1] ) {
+ tmp = a[1];
+ a[1] = b[1];
+ } else {
+ tmp = b[1];
+ }
+ a[0]++;
+ a[a[0]] = tmp;
+
+ if ( b[0] > 1 ) {
+ int i = b[0] - 1;
+ AC_MEMCPY(a+a[0]+1, b+2, i * sizeof(ID));
+ a[0] += i;
+ }
+ if ( swap ) {
+ b[b[0]] = swap;
+ }
+ return 0;
+}
+
+#if 0
+
+/* Quicksort + Insertion sort for small arrays */
+
+#define SMALL 8
+#define SWAP(a,b) itmp=(a);(a)=(b);(b)=itmp
+
+void
+bdb_idl_sort( ID *ids, ID *tmp )
+{
+ int *istack = (int *)tmp;
+ int i,j,k,l,ir,jstack;
+ ID a, itmp;
+
+ if ( BDB_IDL_IS_RANGE( ids ))
+ return;
+
+ ir = 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 */
+ SWAP(ids[k], ids[l+1]);
+ if (ids[l] > ids[ir]) {
+ SWAP(ids[l], ids[ir]);
+ }
+ if (ids[l+1] > ids[ir]) {
+ SWAP(ids[l+1], ids[ir]);
+ }
+ if (ids[l] > ids[l+1]) {
+ 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;
+ SWAP(ids[i],ids[j]);
+ }
+ ids[l+1] = ids[j];
+ ids[j] = a;
+ jstack += 2;
+ if (ir-i+1 >= j-1) {
+ istack[jstack] = ir;
+ istack[jstack-1] = i;
+ ir = j-1;
+ } else {
+ istack[jstack] = j-1;
+ istack[jstack-1] = l;
+ l = i;
+ }
+ }
+ }
+}
+
+#else
+
+/* 8 bit Radix sort + insertion sort
+ *
+ * based on code from http://www.cubic.org/docs/radix.htm
+ * with improvements by mbackes@symas.com and hyc@symas.com
+ *
+ * This code is O(n) but has a relatively high constant factor. For lists
+ * up to ~50 Quicksort is slightly faster; up to ~100 they are even.
+ * Much faster than quicksort for lists longer than ~100. Insertion
+ * sort is actually superior for lists <50.
+ */
+
+#define BUCKETS (1<<8)
+#define SMALL 50
+
+void
+bdb_idl_sort( ID *ids, ID *tmp )
+{
+ int count, soft_limit, phase = 0, size = ids[0];
+ ID *idls[2];
+ unsigned char *maxv = (unsigned char *)&ids[size];
+
+ if ( BDB_IDL_IS_RANGE( ids ))
+ return;
+
+ /* Use insertion sort for small lists */
+ if ( size <= SMALL ) {
+ int i,j;
+ ID a;
+
+ for (j=1;j<=size;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;
+ }
+ return;
+ }
+
+ tmp[0] = size;
+ idls[0] = ids;
+ idls[1] = tmp;
+
+#if BYTE_ORDER == BIG_ENDIAN
+ for (soft_limit = 0; !maxv[soft_limit]; soft_limit++);
+#else
+ for (soft_limit = sizeof(ID)-1; !maxv[soft_limit]; soft_limit--);
+#endif
+
+ for (
+#if BYTE_ORDER == BIG_ENDIAN
+ count = sizeof(ID)-1; count >= soft_limit; --count
+#else
+ count = 0; count <= soft_limit; ++count
+#endif
+ ) {
+ unsigned int num[BUCKETS], * np, n, sum;
+ int i;
+ ID *sp, *source, *dest;
+ unsigned char *bp, *source_start;
+
+ source = idls[phase]+1;
+ dest = idls[phase^1]+1;
+ source_start = ((unsigned char *) source) + count;
+
+ np = num;
+ for ( i = BUCKETS; i > 0; --i ) *np++ = 0;
+
+ /* count occurences of every byte value */
+ bp = source_start;
+ for ( i = size; i > 0; --i, bp += sizeof(ID) )
+ num[*bp]++;
+
+ /* transform count into index by summing elements and storing
+ * into same array
+ */
+ sum = 0;
+ np = num;
+ for ( i = BUCKETS; i > 0; --i ) {
+ n = *np;
+ *np++ = sum;
+ sum += n;
+ }
+
+ /* fill dest with the right values in the right place */
+ bp = source_start;
+ sp = source;
+ for ( i = size; i > 0; --i, bp += sizeof(ID) ) {
+ np = num + *bp;
+ dest[*np] = *sp++;
+ ++(*np);
+ }
+ phase ^= 1;
+ }
+
+ /* copy back from temp if needed */
+ if ( phase ) {
+ ids++; tmp++;
+ for ( count = 0; count < size; ++count )
+ *ids++ = *tmp++;
+ }
+}
+#endif /* Quick vs Radix */
+
+#endif /* BDB_HIER */