Merge pchardin@bk-internal.mysql.com:/home/bk/mysql-5.0

/* Copyright (C) 2005 MySQL AB

   This program 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.

   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 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 "my_global.h"

#include "mysys_priv.h"

#include "m_string.h"

#include <my_dir.h>

#define BUFF_SIZE 1024

#ifdef __WIN__

#define NEWLINE "\r\n"

#define NEWLINE_LEN 2

#else

#define NEWLINE "\n"

#define NEWLINE_LEN 1

#endif

static char *add_option(char *dst, const char *option_value,

			const char *option, int remove_option);

/*

  Add/remove option to the option file section.

    into a buffer. Then we look for the option within this section and

    change/remove it. In the end we get a buffer with modified version of the

    file. Then we write it to the file, truncate it if needed and close it.

    Note that there is a small time gap, when the file is incomplete,

    and this theoretically might introduce a problem.

  RETURN

    0 - ok

    2 - cannot open the file

*/

#include "my_global.h"

#include "mysys_priv.h"

#include "m_string.h"

#include <my_dir.h>

#define BUFF_SIZE 1024

#ifdef __WIN__

#define NEWLINE "\r\n"

#define NEWLINE_LEN 2

#else

#define NEWLINE "\n"

#define NEWLINE_LEN 1

#endif

static char *add_option(char *dst, const char *option_value,

			const char *option, int remove_option);

int modify_defaults_file(const char *file_location, const char *option,

                         const char *option_value,

                         const char *section_name, int remove_option)

  FILE *cnf_file;

  MY_STAT file_stat;

  char linebuff[BUFF_SIZE], *src_ptr, *dst_ptr, *file_buffer;

  uint optlen, optval_len, sect_len, nr_newlines= 0;

  uint opt_len, optval_len, sect_len, nr_newlines= 0;

  my_bool in_section= FALSE, opt_applied= 0;

  DBUG_ENTER("modify_defaults_file");

  if (my_fstat(fileno(cnf_file), &file_stat, MYF(0)))

    goto err;

  optlen= (uint) strlen(option);

  opt_len= (uint) strlen(option);

  optval_len= (uint) strlen(option_value);

  /*

  if (!(file_buffer= (char*) my_malloc(sizeof(char) *

                                       (file_stat.st_size +

                                        /* option name len */

					optlen +

                                        opt_len +

                                        /* reserve space for newline */

                                        NEWLINE_LEN +

                                        /* reserve for '=' char */

                                        1 +

                                        /* option value len */

                                        optval_len +

					/* The ending zero plus some safety */

					FN_REFLEN), MYF(MY_WME))))

                                        /* The ending zero */

                                        1), MYF(MY_WME))))

    goto malloc_err;

  sect_len= (uint) strlen(section_name);

      continue;

    }

    if (!opt_applied && in_section && !strncmp(src_ptr, option, optlen) &&

	(*(src_ptr + optlen) == '=' ||

	 my_isspace(&my_charset_latin1, *(src_ptr + optlen)) ||

	 *(src_ptr + optlen) == '\0'))

    /* correct the option */

    if (!opt_applied && in_section && !strncmp(src_ptr, option, opt_len) &&

        (*(src_ptr + opt_len) == '=' ||

         my_isspace(&my_charset_latin1, *(src_ptr + opt_len)) ||

         *(src_ptr + opt_len) == '\0'))

    {

      dst_ptr= add_option(dst_ptr, option_value, option, remove_option);

      opt_applied= 1;

      if (in_section && !opt_applied && *src_ptr == '[')

      {

        dst_ptr= add_option(dst_ptr, option_value, option, remove_option);

        opt_applied= 1;           /* set the flag to do write() later */

      }

      for (; nr_newlines; nr_newlines--)

        dst_ptr= strmov(dst_ptr, NEWLINE);

      dst_ptr= strmov(dst_ptr, linebuff);