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/>.

**/

​

/* this file is for the minimal possible set of string related functions that are used by libzbxcommon.a */

/* or libraries/files it depends on */

​

#include "zbxcommon.h"

​

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

 *                                                                            *

 * Purpose: Secure version of vsnprintf function.                             *

 *          Add zero character at the end of string.                          *

 *                                                                            *

 * Parameters: str   - [IN/OUT] destination buffer pointer                    *

 *             count - [IN] size of destination buffer                        *

 *             fmt   - [IN] format                                            *

 *                                                                            *

 * Return value: the number of characters in the output buffer                *

 *               (not including the trailing '\0')                            *

 *                                                                            *

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

size_t  zbx_vsnprintf(char *str, size_t count, const char *fmt, va_list args)

{

    int written_len = 0;

​

    if (0 < count)

    {

        if (0 > (written_len = vsnprintf(str, count, fmt, args)))

            written_len = (int)count - 1;       /* count an output error as a full buffer */

        else

            written_len = MIN(written_len, (int)count - 1);     /* result could be truncated */

    }

    str[written_len] = '\0';    /* always write '\0', even if buffer size is 0 or vsnprintf() error */

​

    return (size_t)written_len;

}

​

int zbx_vsnprintf_check_len(const char *fmt, va_list args)

{

    int rv;

​

    if (0 > (rv = vsnprintf(NULL, 0, fmt, args)))

    {

        THIS_SHOULD_NEVER_HAPPEN;

        exit(EXIT_FAILURE);

    }

​

    return rv;

}

​

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

 *                                                                            *