source: branches/samba-3.2.x/source/lib/ldb/common/ldb_controls.c

/* 
   ldb database library

   Copyright (C) Simo Sorce  2005

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/

/*
 *  Name: ldb_controls.c
 *
 *  Component: ldb controls utility functions
 *
 *  Description: helper functions for control modules
 *
 *  Author: Simo Sorce
 */

#include "includes.h"
#include "ldb/include/includes.h"

/* check if a control with the specified "oid" exist and return it */
/* returns NULL if not found */
struct ldb_control *get_control_from_list(struct ldb_control **controls, const char *oid)
{
        int i;

        /* check if there's a paged request control */
        if (controls != NULL) {
                for (i = 0; controls[i]; i++) {
                        if (strcmp(oid, controls[i]->oid) == 0) {
                                break;
                        }
                }

                return controls[i];
        }

        return NULL;
}

/* saves the current controls list into the "saver" and replace the one in req with a new one excluding
the "exclude" control */
/* returns False on error */
int save_controls(struct ldb_control *exclude, struct ldb_request *req, struct ldb_control ***saver)
{
        struct ldb_control **lcs;
        int i, j;

        *saver = req->controls;
        for (i = 0; req->controls[i]; i++);
        if (i == 1) {
                req->controls = NULL;
                return 1;
        }

        lcs = talloc_array(req, struct ldb_control *, i);
        if (!lcs) {
                return 0;
        }

        for (i = 0, j = 0; (*saver)[i]; i++) {
                if (exclude == (*saver)[i]) continue;
                lcs[j] = (*saver)[i];
                j++;
        }
        lcs[j] = NULL;

        req->controls = lcs;
        return 1;
}

/* check if there's any control marked as critical in the list */
/* return True if any, False if none */
int check_critical_controls(struct ldb_control **controls)
{
        int i;

        if (controls == NULL) {
                return 0;
        }

        for (i = 0; controls[i]; i++) {
                if (controls[i]->critical) {
                        return 1;
                }
        }

        return 0;
}