db_row.c

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/* 
 * $Id$ 
 *
 * Copyright (C) 2001-2003 FhG Fokus
 * Copyright (C) 2007-2008 1&1 Internet AG
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "db_row.h"

#include <string.h>
#include "../../dprint.h"
#include "../../mem/mem.h"

/*
 * Release memory used by row
 */
inline int db_free_row(db_row_t* _r)
{
        int col;
        db_val_t* _val;

        if (!_r) {
                LM_ERR("invalid parameter value\n");
                return -1;
        }

        /*
         * Loop thru each columm, then check to determine if the storage pointed to
         * by db_val_t structure must be freed. This is required for all data types
         * which use a pointer to a buffer like DB1_STRING, DB1_STR and DB1_BLOB and
         * the database module copied them during the assignment.
         * If this is not done, a memory leak will happen.
         * Don't try to free the static dummy string (as indicated from the NULL value),
         * as this is not valid.
         */
        for (col = 0; col < ROW_N(_r); col++) {
                _val = &(ROW_VALUES(_r)[col]);
                switch (VAL_TYPE(_val)) {
                        case DB1_STRING:
                                if ( (!VAL_NULL(_val)) && VAL_FREE(_val)) {
                                        LM_DBG("free VAL_STRING[%d] '%s' at %p\n", col,
                                                        (char *)VAL_STRING(_val),
                                                        (char *)VAL_STRING(_val));
                                        pkg_free((char *)VAL_STRING(_val));
                                        VAL_STRING(_val) = NULL;
                                }
                                break;
                        case DB1_STR:
                                if ( (!VAL_NULL(_val)) && VAL_FREE(_val)) {
                                        LM_DBG("free VAL_STR[%d] '%.*s' at %p\n", col,
                                                        VAL_STR(_val).len,
                                                        VAL_STR(_val).s, VAL_STR(_val).s);
                                        pkg_free(VAL_STR(_val).s);
                                        VAL_STR(_val).s = NULL;
                                }
                                break;
                        case DB1_BLOB:
                                if ( (!VAL_NULL(_val)) && VAL_FREE(_val)) {
                                        LM_DBG("free VAL_BLOB[%d] at %p\n", col, VAL_BLOB(_val).s);
                                        pkg_free(VAL_BLOB(_val).s);
                                        VAL_BLOB(_val).s = NULL;
                                }
                                break;
                        default:
                                break;
                }
        }
        /* now as we freed all, set number of colums to zero again */
        ROW_N(_r) = 0;

        if (ROW_VALUES(_r)) {
                LM_DBG("freeing row values at %p\n", ROW_VALUES(_r));
                pkg_free(ROW_VALUES(_r));
                ROW_VALUES(_r) = NULL;
        }
        return 0;
}


inline int db_allocate_row(const db1_res_t* _res, db_row_t* _row)
{
        int len = sizeof(db_val_t) * RES_COL_N(_res);
        ROW_VALUES(_row) = (db_val_t*)pkg_malloc(len);
        if (!ROW_VALUES(_row)) {
                LM_ERR("no private memory left\n");
                return -1;
        }
        LM_DBG("allocate %d bytes for row values at %p\n", len, ROW_VALUES(_row));

        memset(ROW_VALUES(_row), 0, len);
        /* Save the number of columns in the ROW structure */
        ROW_N(_row) = RES_COL_N(_res);

        return 0;
}