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/* sort.c -- LDAP library entry and value sort routines */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2021 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>.
*/
/* Portions Copyright (c) 1994 Regents of the University of Michigan.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of Michigan at Ann Arbor. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/stdlib.h>
#include <ac/ctype.h>
#include <ac/string.h>
#include <ac/time.h>
#include "ldap-int.h"
struct entrything {
char **et_vals;
LDAPMessage *et_msg;
int (*et_cmp_fn) LDAP_P((const char *a, const char *b));
};
static int et_cmp LDAP_P(( const void *aa, const void *bb));
int
ldap_sort_strcasecmp(
LDAP_CONST void *a,
LDAP_CONST void *b
)
{
return( strcasecmp( *(char *const *)a, *(char *const *)b ) );
}
static int
et_cmp(
const void *aa,
const void *bb
)
{
int i, rc;
const struct entrything *a = (const struct entrything *)aa;
const struct entrything *b = (const struct entrything *)bb;
if ( a->et_vals == NULL && b->et_vals == NULL )
return( 0 );
if ( a->et_vals == NULL )
return( -1 );
if ( b->et_vals == NULL )
return( 1 );
for ( i = 0; a->et_vals[i] && b->et_vals[i]; i++ ) {
if ( (rc = a->et_cmp_fn( a->et_vals[i], b->et_vals[i] )) != 0 ) {
return( rc );
}
}
if ( a->et_vals[i] == NULL && b->et_vals[i] == NULL )
return( 0 );
if ( a->et_vals[i] == NULL )
return( -1 );
return( 1 );
}
int
ldap_sort_entries(
LDAP *ld,
LDAPMessage **chain,
LDAP_CONST char *attr, /* NULL => sort by DN */
int (*cmp) (LDAP_CONST char *, LDAP_CONST char *)
)
{
int i, count = 0;
struct entrything *et;
LDAPMessage *e, *ehead = NULL, *etail = NULL;
LDAPMessage *ohead = NULL, *otail = NULL;
LDAPMessage **ep;
assert( ld != NULL );
/* Separate entries from non-entries */
for ( e = *chain; e; e=e->lm_chain ) {
if ( e->lm_msgtype == LDAP_RES_SEARCH_ENTRY ) {
count++;
if ( !ehead ) ehead = e;
if ( etail ) etail->lm_chain = e;
etail = e;
} else {
if ( !ohead ) ohead = e;
if ( otail ) otail->lm_chain = e;
otail = e;
}
}
if ( count < 2 ) {
/* zero or one entries -- already sorted! */
if ( ehead ) {
etail->lm_chain = ohead;
*chain = ehead;
} else {
*chain = ohead;
}
return 0;
}
if ( (et = (struct entrything *) LDAP_MALLOC( count *
sizeof(struct entrything) )) == NULL ) {
ld->ld_errno = LDAP_NO_MEMORY;
return( -1 );
}
e = ehead;
for ( i = 0; i < count; i++ ) {
et[i].et_cmp_fn = cmp;
et[i].et_msg = e;
if ( attr == NULL ) {
char *dn;
dn = ldap_get_dn( ld, e );
et[i].et_vals = ldap_explode_dn( dn, 1 );
LDAP_FREE( dn );
} else {
et[i].et_vals = ldap_get_values( ld, e, attr );
}
e = e->lm_chain;
}
qsort( et, count, sizeof(struct entrything), et_cmp );
ep = chain;
for ( i = 0; i < count; i++ ) {
*ep = et[i].et_msg;
ep = &(*ep)->lm_chain;
LDAP_VFREE( et[i].et_vals );
}
*ep = ohead;
(*chain)->lm_chain_tail = otail ? otail : etail;
LDAP_FREE( (char *) et );
return( 0 );
}
int
ldap_sort_values(
LDAP *ld,
char **vals,
int (*cmp) (LDAP_CONST void *, LDAP_CONST void *)
)
{
int nel;
for ( nel = 0; vals[nel] != NULL; nel++ )
; /* NULL */
qsort( vals, nel, sizeof(char *), cmp );
return( 0 );
}
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