ldap/common/getattr.c

/*
 * Copyright (c) 2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation. Portions created by Netscape are
 * Copyright (C) 1998-1999 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s):
 */
/*
 *  Copyright (c) 1990 Regents of the University of Michigan.
 *  All rights reserved.
 */
/*
 *  getattr.c
 */

#if 0
#ifndef lint
static char copyright[] = "@(#) Copyright (c) 1990 Regents of the University of Michigan.\nAll rights reserved.\n";
#endif
#endif

#include "ldap-int.h"


static ber_len_t
bytes_remaining( BerElement *ber )
{
    ber_len_t   len;

    if ( ber_get_option( ber, LBER_OPT_REMAINING_BYTES, &len ) != 0 ) {
        return( 0 );    /* not sure what else to do.... */
    }
    return( len );
}


char *
LDAP_CALL
ldap_first_attribute( LDAP *ld, LDAPMessage *entry, BerElement **ber )
{
    char    *attr;
    int err;
    ber_int_t   seqlength;

    LDAPDebug( LDAP_DEBUG_TRACE, "ldap_first_attribute\n", 0, 0, 0 );

    if ( !NSLDAPI_VALID_LDAP_POINTER( ld )) {
        return( NULL );     /* punt */
    }

    if ( ber == NULL || !NSLDAPI_VALID_LDAPMESSAGE_ENTRY_POINTER( entry )) {
        LDAP_SET_LDERRNO( ld, LDAP_PARAM_ERROR, NULL, NULL );
        return( NULL );
    }

    if ( nsldapi_alloc_ber_with_options( ld, ber ) != LDAP_SUCCESS ) {
        return( NULL );
    }

    **ber = *entry->lm_ber;

    attr = NULL;            /* pessimistic */
    err = LDAP_DECODING_ERROR;  /* ditto */

    /*
     * Skip past the sequence, dn, and sequence of sequence.
     * Reset number of bytes remaining so we confine the rest of our
     * decoding to the current sequence.
     */
    if ( ber_scanf( *ber, "{xl{", &seqlength ) != LBER_ERROR &&
         ber_set_option( *ber, LBER_OPT_REMAINING_BYTES, &seqlength )
        == 0 ) {
        /* snarf the attribute type, and skip the set of values,
         * leaving us positioned right before the next attribute
         * type/value sequence.
         */
        if ( ber_scanf( *ber, "{ax}", &attr ) != LBER_ERROR ||
            bytes_remaining( *ber ) == 0 ) {
            err = LDAP_SUCCESS;
        }
    }

    LDAP_SET_LDERRNO( ld, err, NULL, NULL );
    if ( attr == NULL || err != LDAP_SUCCESS ) {
        ber_free( *ber, 0 );
        *ber = NULL;
    }
    return( attr );
}

/* ARGSUSED */
char *
LDAP_CALL
ldap_next_attribute( LDAP *ld, LDAPMessage *entry, BerElement *ber )
{
    char    *attr;
    int err;

    LDAPDebug( LDAP_DEBUG_TRACE, "ldap_next_attribute\n", 0, 0, 0 );

    if ( !NSLDAPI_VALID_LDAP_POINTER( ld )) {
        return( NULL );     /* punt */
    }

    if ( ber == NULL || !NSLDAPI_VALID_LDAPMESSAGE_ENTRY_POINTER( entry )) {
        LDAP_SET_LDERRNO( ld, LDAP_PARAM_ERROR, NULL, NULL );
        return( NULL );
    }

    attr = NULL;            /* pessimistic */
    err = LDAP_DECODING_ERROR;  /* ditto */

    /* skip sequence, snarf attribute type, skip values */
    if ( ber_scanf( ber, "{ax}", &attr ) != LBER_ERROR ||
        bytes_remaining( ber ) == 0 ) {
        err = LDAP_SUCCESS;
    }

    LDAP_SET_LDERRNO( ld, err, NULL, NULL );
    return( attr );
}