Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "trends.h"

​

#include "zbxcommon.h"

#include "zbxdbhigh.h"

#include "zbxdb.h"

#include "zbxcacheconfig.h"

​

static char *trends_errors[ZBX_TREND_STATE_COUNT] = {

        "unknown error",

        NULL,

        "not enough data",

        "value is too large"

};

​

/******************************************************************************

 *                                                                            *

 * Purpose: parse largest period base from function parameters                *

 *                                                                            *

 * Parameters: shift  - [IN] period shift parameter                           *

 *             base   - [OUT] period shift base (now/?)                       *

 *             error  - [OUT] error message if parsing failed                 *

 *                                                                            *

 * Return value: SUCCEED - period was parsed successfully                     *

 *               FAIL    - invalid time period was specified                  *

 *                                                                            *

 ******************************************************************************/

static int  trends_parse_base(const char *period_shift, zbx_time_unit_t *base, char **error)

{

    zbx_time_unit_t time_unit = ZBX_TIME_UNIT_UNKNOWN;

    const char  *ptr;

​

    for (ptr = period_shift; NULL != (ptr = strchr(ptr, '/'));)

    {

        zbx_time_unit_t tu;

​

        if (ZBX_TIME_UNIT_UNKNOWN == (tu = zbx_tm_str_to_unit(++ptr)))

        {

            *error = zbx_strdup(*error, "invalid period shift cycle");

            return FAIL;

        }

​

        if (tu > time_unit)

            time_unit = tu;

    }

​

    if (ZBX_TIME_UNIT_UNKNOWN == time_unit)

    {

        *error = zbx_strdup(*error, "invalid period shift expression");

        return FAIL;

    }

​

    *base = time_unit;

​

    return SUCCEED;

}

​

/******************************************************************************

 *                                                                            *

 * Purpose: parse largest period base from function parameters                *

 *                                                                            *

 * Parameters: params - [IN] function parameters                              *

 *             base   - [OUT] period shift base (now/?)                       *

 *             error  - [OUT] error message if parsing failed                 *

 *                                                                            *

 * Return value: SUCCEED - period was parsed successfully                     *

 *               FAIL    - invalid time period was specified                  *

 *                                                                            *

 ******************************************************************************/

int zbx_trends_parse_base(const char *params, zbx_time_unit_t *base, char **error)

{

    const char  *period_shift;

​

    if (NULL == (period_shift = strchr(params, ':')))

    {

        *error = zbx_strdup(*error, "missing period shift parameter");

        return FAIL;

    }