/* 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 mdb_idl_append( ID *a, ID *b )
{
ID ida, idb, tmp, swap = 0;
if ( MDB_IDL_IS_ZERO( b ) ) {
return 0;
}
if ( MDB_IDL_IS_ZERO( a ) ) {
MDB_IDL_CPY( a, b );
return 0;
}
ida = MDB_IDL_LAST( a );
idb = MDB_IDL_LAST( b );
if ( MDB_IDL_IS_RANGE( a ) || MDB_IDL_IS_RANGE(b) ||
a[0] + b[0] >= MDB_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;
}
/*
* mdb_idl_notin - return a intersection ~b (or a minus b)
*/
int
mdb_idl_notin(
ID *a,
ID *b,
ID *ids )
{
ID ida, idb;
ID cursora = 0, cursorb = 0;
if( MDB_IDL_IS_ZERO( a ) ||
MDB_IDL_IS_ZERO( b ) ||
MDB_IDL_IS_RANGE( b ) )
{
MDB_IDL_CPY( ids, a );
return 0;
}
if( MDB_IDL_IS_RANGE( a ) ) {
MDB_IDL_CPY( ids, a );
return 0;
}
ida = mdb_idl_first( a, &cursora ),
idb = mdb_idl_first( b, &cursorb );
ids[0] = 0;
while( ida != NOID ) {
if ( idb == NOID ) {
/* we could shortcut this */
ids[++ids[0]] = ida;
ida = mdb_idl_next( a, &cursora );
} else if ( ida < idb ) {
ids[++ids[0]] = ida;
ida = mdb_idl_next( a, &cursora );
} else if ( ida > idb ) {
idb = mdb_idl_next( b, &cursorb );
} else {
ida = mdb_idl_next( a, &cursora );
idb = mdb_idl_next( b, &cursorb );
}
}
return 0;
}
static int
substring_candidates(
Operation *op,
MDB_txn *rtxn,
SubstringsAssertion *sub,
ID *ids,
ID *tmp )
{
MDB_dbi dbi;
int i;
int rc;
slap_mask_t mask;
struct berval prefix = {0, NULL};
struct berval *keys = NULL;
MatchingRule *mr;
Debug( LDAP_DEBUG_TRACE, "=> mdb_substring_candidates (%s)\n",
sub->sa_desc->ad_cname.bv_val, 0, 0 );
MDB_IDL_ALL( ids );
rc = mdb_index_param( op->o_bd, sub->sa_desc, LDAP_FILTER_SUBSTRINGS,
&dbi, &mask, &prefix );
if ( rc == LDAP_INAPPROPRIATE_MATCHING ) {
Debug( LDAP_DEBUG_ANY,
"<= mdb_substring_candidates: (%s) not indexed\n",
sub->sa_desc->ad_cname.bv_val, 0, 0 );
return 0;
}
if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_ANY,
"<= mdb_substring_candidates: (%s) "
"index_param failed (%d)\n",
sub->sa_desc->ad_cname.bv_val, rc, 0 );
return 0;
}
mr = sub->sa_desc->ad_type->sat_substr;
if( !mr ) {
return 0;
}
if( !mr->smr_filter ) {
return 0;
}
rc = (mr->smr_filter)(
LDAP_FILTER_SUBSTRINGS,
mask,
sub->sa_desc->ad_type->sat_syntax,
mr,
&prefix,
sub,
&keys, op->o_tmpmemctx );
if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_substring_candidates: (%s) "
"MR filter failed (%d)\n",
sub->sa_desc->ad_cname.bv_val, rc, 0 );
return 0;
}
if( keys == NULL ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_substring_candidates: (0x%04lx) no keys (%s)\n",
mask, sub->sa_desc->ad_cname.bv_val, 0 );
return 0;
}
for ( i= 0; keys[i].bv_val != NULL; i++ ) {
rc = mdb_key_read( op->o_bd, rtxn, dbi, &keys[i], tmp, NULL, 0 );
if( rc == MDB_NOTFOUND ) {
MDB_IDL_ZERO( ids );
rc = 0;
break;
} else if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_substring_candidates: (%s) "
"key read failed (%d)\n",
sub->sa_desc->ad_cname.bv_val, rc, 0 );
break;
}
if( MDB_IDL_IS_ZERO( tmp ) ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_substring_candidates: (%s) NULL\n",
sub->sa_desc->ad_cname.bv_val, 0, 0 );
MDB_IDL_ZERO( ids );
break;
}
if ( i == 0 ) {
MDB_IDL_CPY( ids, tmp );
} else {
mdb_idl_intersection( ids, tmp );
}
if( MDB_IDL_IS_ZERO( ids ) )
break;
}
ber_bvarray_free_x( keys, op->o_tmpmemctx );
Debug( LDAP_DEBUG_TRACE, "<= mdb_substring_candidates: %ld, first=%ld, last=%ld\n",
(long) ids[0],
(long) MDB_IDL_FIRST(ids),
(long) MDB_IDL_LAST(ids) );
return( rc );
}
static int
equality_candidates(
Operation *op,
MDB_txn *rtxn,
AttributeAssertion *ava,
ID *ids,
ID *tmp )
{
MDB_dbi dbi;
int i;
int rc;
slap_mask_t mask;
struct berval prefix = {0, NULL};
struct berval *keys = NULL;
MatchingRule *mr;
Debug( LDAP_DEBUG_TRACE, "=> mdb_equality_candidates (%s)\n",
ava->aa_desc->ad_cname.bv_val, 0, 0 );
if ( ava->aa_desc == slap_schema.si_ad_entryDN ) {
ID id;
rc = mdb_dn2id( op, rtxn, NULL, &ava->aa_value, &id, NULL, NULL, NULL );
if ( rc == LDAP_SUCCESS ) {
/* exactly one ID can match */
ids[0] = 1;
ids[1] = id;
}
if ( rc == MDB_NOTFOUND ) {
MDB_IDL_ZERO( ids );
rc = 0;
}
return rc;
}
MDB_IDL_ALL( ids );
rc = mdb_index_param( op->o_bd, ava->aa_desc, LDAP_FILTER_EQUALITY,
&dbi, &mask, &prefix );
if ( rc == LDAP_INAPPROPRIATE_MATCHING ) {
Debug( LDAP_DEBUG_ANY,
"<= mdb_equality_candidates: (%s) not indexed\n",
ava->aa_desc->ad_cname.bv_val, 0, 0 );
return 0;
}
if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_ANY,
"<= mdb_equality_candidates: (%s) "
"index_param failed (%d)\n",
ava->aa_desc->ad_cname.bv_val, rc, 0 );
return 0;
}
mr = ava->aa_desc->ad_type->sat_equality;
if( !mr ) {
return 0;
}
if( !mr->smr_filter ) {
return 0;
}
rc = (mr->smr_filter)(
LDAP_FILTER_EQUALITY,
mask,
ava->aa_desc->ad_type->sat_syntax,
mr,
&prefix,
&ava->aa_value,
&keys, op->o_tmpmemctx );
if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_equality_candidates: (%s, %s) "
"MR filter failed (%d)\n",
prefix.bv_val, ava->aa_desc->ad_cname.bv_val, rc );
return 0;
}
if( keys == NULL ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_equality_candidates: (%s) no keys\n",
ava->aa_desc->ad_cname.bv_val, 0, 0 );
return 0;
}
for ( i= 0; keys[i].bv_val != NULL; i++ ) {
rc = mdb_key_read( op->o_bd, rtxn, dbi, &keys[i], tmp, NULL, 0 );
if( rc == MDB_NOTFOUND ) {
MDB_IDL_ZERO( ids );
rc = 0;
break;
} else if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_equality_candidates: (%s) "
"key read failed (%d)\n",
ava->aa_desc->ad_cname.bv_val, rc, 0 );
break;
}
if( MDB_IDL_IS_ZERO( tmp ) ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_equality_candidates: (%s) NULL\n",
ava->aa_desc->ad_cname.bv_val, 0, 0 );
MDB_IDL_ZERO( ids );
break;
}
if ( i == 0 ) {
MDB_IDL_CPY( ids, tmp );
} else {
mdb_idl_intersection( ids, tmp );
}
if( MDB_IDL_IS_ZERO( ids ) )
break;
}
ber_bvarray_free_x( keys, op->o_tmpmemctx );
Debug( LDAP_DEBUG_TRACE,
"<= mdb_equality_candidates: id=%ld, first=%ld, last=%ld\n",
(long) ids[0],
(long) MDB_IDL_FIRST(ids),
(long) MDB_IDL_LAST(ids) );
return( rc );
}
static int
list_candidates(
Operation *op,
MDB_txn *rtxn,
Filter *flist,
int ftype,
ID *ids,
ID *tmp,
ID *save )
{
int rc = 0;
Filter *f;
Debug( LDAP_DEBUG_FILTER, "=> mdb_list_candidates 0x%x\n", ftype, 0, 0 );
for ( f = flist; f != NULL; f = f->f_next ) {
/* ignore precomputed scopes */
if ( f->f_choice == SLAPD_FILTER_COMPUTED &&
f->f_result == LDAP_SUCCESS ) {
continue;
}
MDB_IDL_ZERO( save );
rc = mdb_filter_candidates( op, rtxn, f, save, tmp,
save+MDB_IDL_UM_SIZE );
if ( rc != 0 ) {
if ( ftype == LDAP_FILTER_AND ) {
rc = 0;
continue;
}
break;
}
if ( ftype == LDAP_FILTER_AND ) {
if ( f == flist ) {
MDB_IDL_CPY( ids, save );
} else {
mdb_idl_intersection( ids, save );
}
if( MDB_IDL_IS_ZERO( ids ) )
break;
} else {
if ( f == flist ) {
MDB_IDL_CPY( ids, save );
} else {
mdb_idl_union( ids, save );
}
}
}
if( rc == LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_FILTER,
"<= mdb_list_candidates: id=%ld first=%ld last=%ld\n",
(long) ids[0],
(long) MDB_IDL_FIRST(ids),
(long) MDB_IDL_LAST(ids) );
} else {
Debug( LDAP_DEBUG_FILTER,
"<= mdb_list_candidates: undefined rc=%d\n",
rc, 0, 0 );
}
return rc;
}
static int
comp_equality_candidates (
Operation *op,
MDB_txn *rtxn,
MatchingRuleAssertion *mra,
ComponentAssertion *ca,
ID *ids,
ID *tmp,
ID *stack)
{
MDB_dbi dbi;
int i;
int rc;
slap_mask_t mask;
struct berval prefix = {0, NULL};
struct berval *keys = NULL;
MatchingRule *mr = mra->ma_rule;
Syntax *sat_syntax;
ComponentReference* cr_list, *cr;
AttrInfo *ai;
MDB_IDL_ALL( ids );
if ( !ca->ca_comp_ref )
return 0;
ai = mdb_attr_mask( op->o_bd->be_private, mra->ma_desc );
if( ai ) {
cr_list = ai->ai_cr;
}
else {
return 0;
}
/* find a component reference to be indexed */
sat_syntax = ca->ca_ma_rule->smr_syntax;
for ( cr = cr_list ; cr ; cr = cr->cr_next ) {
if ( cr->cr_string.bv_len == ca->ca_comp_ref->cr_string.bv_len &&
strncmp( cr->cr_string.bv_val, ca->ca_comp_ref->cr_string.bv_val,cr->cr_string.bv_len ) == 0 )
break;
}
if ( !cr )
return 0;
rc = mdb_index_param( op->o_bd, mra->ma_desc, LDAP_FILTER_EQUALITY,
&dbi, &mask, &prefix );
if( rc != LDAP_SUCCESS ) {
return 0;
}
if( !mr ) {
return 0;
}
if( !mr->smr_filter ) {
return 0;
}
rc = (ca->ca_ma_rule->smr_filter)(
LDAP_FILTER_EQUALITY,
cr->cr_indexmask,
sat_syntax,
ca->ca_ma_rule,
&prefix,
&ca->ca_ma_value,
&keys, op->o_tmpmemctx );
if( rc != LDAP_SUCCESS ) {
return 0;
}
if( keys == NULL ) {
return 0;
}
for ( i= 0; keys[i].bv_val != NULL; i++ ) {
rc = mdb_key_read( op->o_bd, rtxn, dbi, &keys[i], tmp, NULL, 0 );
if( rc == MDB_NOTFOUND ) {
MDB_IDL_ZERO( ids );
rc = 0;
break;
} else if( rc != LDAP_SUCCESS ) {
break;
}
if( MDB_IDL_IS_ZERO( tmp ) ) {
MDB_IDL_ZERO( ids );
break;
}
if ( i == 0 ) {
MDB_IDL_CPY( ids, tmp );
} else {
mdb_idl_intersection( ids, tmp );
}
if( MDB_IDL_IS_ZERO( ids ) )
break;
}
ber_bvarray_free_x( keys, op->o_tmpmemctx );
Debug( LDAP_DEBUG_TRACE,
"<= comp_equality_candidates: id=%ld, first=%ld, last=%ld\n",
(long) ids[0],
(long) MDB_IDL_FIRST(ids),
(long) MDB_IDL_LAST(ids) );
return( rc );
}
static int
inequality_candidates(
Operation *op,
MDB_txn *rtxn,
AttributeAssertion *ava,
ID *ids,
ID *tmp,
int gtorlt )
{
MDB_dbi dbi;
int rc;
slap_mask_t mask;
struct berval prefix = {0, NULL};
struct berval *keys = NULL;
MatchingRule *mr;
MDB_cursor *cursor = NULL;
Debug( LDAP_DEBUG_TRACE, "=> mdb_inequality_candidates (%s)\n",
ava->aa_desc->ad_cname.bv_val, 0, 0 );
MDB_IDL_ALL( ids );
rc = mdb_index_param( op->o_bd, ava->aa_desc, LDAP_FILTER_EQUALITY,
&dbi, &mask, &prefix );
if ( rc == LDAP_INAPPROPRIATE_MATCHING ) {
Debug( LDAP_DEBUG_ANY,
"<= mdb_inequality_candidates: (%s) not indexed\n",
ava->aa_desc->ad_cname.bv_val, 0, 0 );
return 0;
}
if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_ANY,
"<= mdb_inequality_candidates: (%s) "
"index_param failed (%d)\n",
ava->aa_desc->ad_cname.bv_val, rc, 0 );
return 0;
}
mr = ava->aa_desc->ad_type->sat_equality;
if( !mr ) {
return 0;
}
if( !mr->smr_filter ) {
return 0;
}
rc = (mr->smr_filter)(
LDAP_FILTER_EQUALITY,
mask,
ava->aa_desc->ad_type->sat_syntax,
mr,
&prefix,
&ava->aa_value,
&keys, op->o_tmpmemctx );
if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_inequality_candidates: (%s, %s) "
"MR filter failed (%d)\n",
prefix.bv_val, ava->aa_desc->ad_cname.bv_val, rc );
return 0;
}
if( keys == NULL ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_inequality_candidates: (%s) no keys\n",
ava->aa_desc->ad_cname.bv_val, 0, 0 );
return 0;
}
MDB_IDL_ZERO( ids );
while(1) {
rc = mdb_key_read( op->o_bd, rtxn, dbi, &keys[0], tmp, &cursor, gtorlt );
if( rc == MDB_NOTFOUND ) {
rc = 0;
break;
} else if( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_inequality_candidates: (%s) "
"key read failed (%d)\n",
ava->aa_desc->ad_cname.bv_val, rc, 0 );
break;
}
if( MDB_IDL_IS_ZERO( tmp ) ) {
Debug( LDAP_DEBUG_TRACE,
"<= mdb_inequality_candidates: (%s) NULL\n",
ava->aa_desc->ad_cname.bv_val, 0, 0 );
break;
}
mdb_idl_union( ids, tmp );
if( op->ors_limit && op->ors_limit->lms_s_unchecked != -1 &&
MDB_IDL_N( ids ) >= (unsigned) op->ors_limit->lms_s_unchecked ) {
mdb_cursor_close( cursor );
break;
}
}
ber_bvarray_free_x( keys, op->o_tmpmemctx );
Debug( LDAP_DEBUG_TRACE,
"<= mdb_inequality_candidates: id=%ld, first=%ld, last=%ld\n",
(long) ids[0],
(long) MDB_IDL_FIRST(ids),
(long) MDB_IDL_LAST(ids) );
return( rc );
}
/* Look for and dereference all aliases within the search scope.
* Requires "stack" to be able to hold 6 levels of DB_SIZE IDLs.
* Of course we're hardcoded to require a minimum of 8 UM_SIZE
* IDLs so this is never a problem.
*/
static int search_aliases(
Operation *op,
SlapReply *rs,
ID e_id,
IdScopes *isc,
MDB_cursor *mci,
ID *stack )
{
ID *aliases, *curscop, *visited, *newsubs, *oldsubs, *tmp;
ID cursora, ida, cursoro, ido;
Entry *matched, *a;
struct berval bv_alias = BER_BVC( "alias" );
AttributeAssertion aa_alias = ATTRIBUTEASSERTION_INIT;
Filter af;
int first = 1;
aliases = stack; /* IDL of all aliases in the database */
curscop = aliases + MDB_IDL_DB_SIZE; /* Aliases in the current scope */
visited = curscop + MDB_IDL_DB_SIZE; /* IDs we've seen in this search */
newsubs = visited + MDB_IDL_DB_SIZE; /* New subtrees we've added */
oldsubs = newsubs + MDB_IDL_DB_SIZE; /* Subtrees added previously */
tmp = oldsubs + MDB_IDL_DB_SIZE; /* Scratch space for deref_base() */
af.f_choice = LDAP_FILTER_EQUALITY;
af.f_ava = &aa_alias;
af.f_av_desc = slap_schema.si_ad_objectClass;
af.f_av_value = bv_alias;
af.f_next = NULL;
/* Find all aliases in database */
MDB_IDL_ZERO( aliases );
rs->sr_err = mdb_filter_candidates( op, isc->mt, &af, aliases,
curscop, visited );
if (rs->sr_err != LDAP_SUCCESS || MDB_IDL_IS_ZERO( aliases )) {
return rs->sr_err;
}
oldsubs[0] = 1;
oldsubs[1] = e_id;
MDB_IDL_ZERO( visited );
MDB_IDL_ZERO( newsubs );
cursoro = 0;
ido = mdb_idl_first( oldsubs, &cursoro );
for (;;) {
/* Set curscop to only the aliases in the current scope. Start with
* all the aliases, then get the intersection with the scope.
*/
rs->sr_err = mdb_idscope( op, isc->mt, e_id, aliases, curscop );
/* Dereference all of the aliases in the current scope. */
cursora = 0;
for (ida = mdb_idl_first(curscop, &cursora); ida != NOID;
ida = mdb_idl_next(curscop, &cursora))
{
rs->sr_err = mdb_id2entry(op, mci, ida, &a);
if (rs->sr_err != LDAP_SUCCESS) {
continue;
}
/* This should only happen if the curscop IDL has maxed out and
* turned into a range that spans IDs indiscriminately
*/
if (!is_entry_alias(a)) {
mdb_entry_return(op, a);
continue;
}
/* Actually dereference the alias */
MDB_IDL_ZERO(tmp);
a = deref_base( op, rs, a, &matched, isc->mt,
tmp, visited );
if (a) {
/* If the target was not already in our current scopes,
* make note of it in the newsubs list.
*/
ID2 mid;
mid.mid = a->e_id;
mid.mval.mv_data = NULL;
if (op->ors_scope == LDAP_SCOPE_SUBTREE) {
isc->id = a->e_id;
/* if ID is a child of any of our current scopes,
* ignore it, it's already included.
*/
if (mdb_idscopechk(op, isc))
goto skip;
}
if (mdb_id2l_insert(isc->scopes, &mid) == 0) {
mdb_idl_insert(newsubs, a->e_id);
}
skip: mdb_entry_return( op, a );
} else if (matched) {
/* Alias could not be dereferenced, or it deref'd to
* an ID we've already seen. Ignore it.
*/
mdb_entry_return( op, matched );
rs->sr_text = NULL;
rs->sr_err = 0;
}
}
/* If this is a OneLevel search, we're done; oldsubs only had one
* ID in it. For a Subtree search, oldsubs may be a list of scope IDs.
*/
if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) break;
nextido:
ido = mdb_idl_next( oldsubs, &cursoro );
/* If we're done processing the old scopes, did we add any new
* scopes in this iteration? If so, go back and do those now.
*/
if (ido == NOID) {
if (MDB_IDL_IS_ZERO(newsubs)) break;
MDB_IDL_CPY(oldsubs, newsubs);
MDB_IDL_ZERO(newsubs);
cursoro = 0;
ido = mdb_idl_first( oldsubs, &cursoro );
}
/* Find the entry corresponding to the next scope. If it can't
* be found, ignore it and move on. This should never happen;
* we should never see the ID of an entry that doesn't exist.
*/
{
MDB_val edata;
rs->sr_err = mdb_id2edata(op, mci, ido, &edata);
if ( rs->sr_err != MDB_SUCCESS ) {
goto nextido;
}
e_id = ido;
}
}
return rs->sr_err;
}
/*
* idl_union - return a = a union b
*/
int
mdb_idl_union(
ID *a,
ID *b )
{
ID ida, idb;
ID cursora = 0, cursorb = 0, cursorc;
if ( MDB_IDL_IS_ZERO( b ) ) {
return 0;
}
if ( MDB_IDL_IS_ZERO( a ) ) {
MDB_IDL_CPY( a, b );
return 0;
}
if ( MDB_IDL_IS_RANGE( a ) || MDB_IDL_IS_RANGE(b) ) {
over: ida = IDL_MIN( MDB_IDL_FIRST(a), MDB_IDL_FIRST(b) );
idb = IDL_MAX( MDB_IDL_LAST(a), MDB_IDL_LAST(b) );
a[0] = NOID;
a[1] = ida;
a[2] = idb;
return 0;
}
ida = mdb_idl_first( a, &cursora );
idb = mdb_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 > MDB_IDL_UM_MAX ) {
goto over;
}
b[cursorc] = ida;
ida = mdb_idl_next( a, &cursora );
} else {
if ( ida == idb )
ida = mdb_idl_next( a, &cursora );
idb = mdb_idl_next( b, &cursorb );
}
}
/* 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++;
}
}
return 0;
}
/*
* idl_intersection - return a = a intersection b
*/
int
mdb_idl_intersection(
ID *a,
ID *b )
{
ID ida, idb;
ID idmax, idmin;
ID cursora = 0, cursorb = 0, cursorc;
int swap = 0;
if ( MDB_IDL_IS_ZERO( a ) || MDB_IDL_IS_ZERO( b ) ) {
a[0] = 0;
return 0;
}
idmin = IDL_MAX( MDB_IDL_FIRST(a), MDB_IDL_FIRST(b) );
idmax = IDL_MIN( MDB_IDL_LAST(a), MDB_IDL_LAST(b) );
if ( idmin > idmax ) {
a[0] = 0;
return 0;
} else if ( idmin == idmax ) {
a[0] = 1;
a[1] = idmin;
return 0;
}
if ( MDB_IDL_IS_RANGE( a ) ) {
if ( MDB_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 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 ( MDB_IDL_IS_RANGE( b )
&& MDB_IDL_RANGE_FIRST( b ) <= MDB_IDL_RANGE_FIRST( a )
&& MDB_IDL_RANGE_LAST( b ) >= MDB_IDL_RANGE_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 = mdb_idl_first( a, &cursora );
idb = mdb_idl_first( b, &cursorb );
cursorc = 0;
while( ida <= idmax || idb <= idmax ) {
if( ida == idb ) {
a[++cursorc] = ida;
ida = mdb_idl_next( a, &cursora );
idb = mdb_idl_next( b, &cursorb );
} else if ( ida < idb ) {
ida = mdb_idl_next( a, &cursora );
} else {
idb = mdb_idl_next( b, &cursorb );
}
}
a[0] = cursorc;
done:
if (swap)
MDB_IDL_CPY( b, a );
return 0;
}
