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 "zbxfile.h"

​

void    zbx_find_cr_lf_szbyte(const char *encoding, const char **cr, const char **lf, size_t *szbyte)

{

    /* default is single-byte character set */

    *cr = "\r";

    *lf = "\n";

    *szbyte = 1;

​

    if ('\0' != *encoding)

    {

        if (0 == strcasecmp(encoding, "UNICODE") || 0 == strcasecmp(encoding, "UNICODELITTLE") ||

                0 == strcasecmp(encoding, "UTF-16") || 0 == strcasecmp(encoding, "UTF-16LE") ||

                0 == strcasecmp(encoding, "UTF16") || 0 == strcasecmp(encoding, "UTF16LE") ||

                0 == strcasecmp(encoding, "UCS-2") || 0 == strcasecmp(encoding, "UCS-2LE"))

        {

            *cr = "\r\0";

            *lf = "\n\0";

            *szbyte = 2;

        }

        else if (0 == strcasecmp(encoding, "UNICODEBIG") || 0 == strcasecmp(encoding, "UNICODEFFFE") ||

                0 == strcasecmp(encoding, "UTF-16BE") || 0 == strcasecmp(encoding, "UTF16BE") ||

                0 == strcasecmp(encoding, "UCS-2BE"))

        {

            *cr = "\0\r";

            *lf = "\0\n";

            *szbyte = 2;

        }

        else if (0 == strcasecmp(encoding, "UTF-32") || 0 == strcasecmp(encoding, "UTF-32LE") ||

                0 == strcasecmp(encoding, "UTF32") || 0 == strcasecmp(encoding, "UTF32LE"))

        {

            *cr = "\r\0\0\0";

            *lf = "\n\0\0\0";

            *szbyte = 4;

        }

        else if (0 == strcasecmp(encoding, "UTF-32BE") || 0 == strcasecmp(encoding, "UTF32BE"))

        {

            *cr = "\0\0\0\r";

            *lf = "\0\0\0\n";

            *szbyte = 4;

        }

    }

}

​

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

 *                                                                            *

 * Purpose: Read one text line from a file descriptor into buffer             *

 *                                                                            *

 * Parameters: fd       - [IN] file descriptor to read from                   *

 *             buf      - [OUT] buffer to read into                           *

 *             count    - [IN] buffer size in bytes                           *

 *             encoding - [IN] pointer to a text string describing encoding.  *

 *                        See function zbx_find_cr_lf_szbyte() for supported  *

 *                        encodings.                                          *

 *                        "" (empty string) means a single-byte character set.*

 *                                                                            *

 * Return value: On success, the number of bytes read is returned (0 (zero)   *

 *               indicates end of file).                                      *

 *               On error, -1 (ZBX_READ_ERR) is returned and errno is set     *

 *               appropriately.                                               *

 *               If the wrong decoding is detected, -2                        *

 *               (ZBX_READ_WRONG_ENCODING) is returned.                       *

 *                                                                            *

 * Comments: Reading stops after a newline. If the newline is read, it is     *

 *           stored into the buffer.                                          *

 *                                                                            *

 * Note: This function is left for testing purposes.                          *

 *                                                                            *

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

int zbx_read_text_line_from_file(int fd, char *buf, size_t count, const char *encoding)

{

    size_t      i, szbyte;

    ssize_t     nbytes;

    const char  *cr, *lf;

    zbx_offset_t    offset;

​

    if ((zbx_offset_t)-1 == (offset = zbx_lseek(fd, 0, SEEK_CUR)))