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

Browse source 
into mysql.com:/home/cps/mysql/trees/mysql-5.0
This commit is contained in:
petr@mysql.com 2005-06-22 12:41:29 +04:00
commit 71b425bedb
1 changed files with 73 additions and 51 deletions
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84
mysys/default_modify.c
View file

@ -1,26 +1,18 @@
/*
Add/remove option to the option file section.
/* Copyright (C) 2005 MySQL AB
SYNOPSYS
modify_defaults_file()
file_location The location of configuration file to edit
option option to look for
option value The value of the option we would like to set
section_name the name of the section
remove_option This is true if we want to remove the option.
False otherwise.
IMPLEMENTATION
We open the option file first, then read the file line-by-line,
looking for the section we need. At the same time we put these lines
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.
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.
RETURN
0 - ok
1 - some error has occured. Probably due to the lack of resourses
2 - cannot open the file
*/
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"
@ -40,6 +32,33 @@
static char *add_option(char *dst, const char *option_value,
const char *option, int remove_option);
/*
Add/remove option to the option file section.
SYNOPSYS
modify_defaults_file()
file_location The location of configuration file to edit
option option to look for
option value The value of the option we would like to set
section_name the name of the section
remove_option This is true if we want to remove the option.
False otherwise.
IMPLEMENTATION
We open the option file first, then read the file line-by-line,
looking for the section we need. At the same time we put these lines
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
1 - some error has occured. Probably due to the lack of resourses
2 - cannot open the file
*/
int modify_defaults_file(const char *file_location, const char *option,
const char *option_value,
const char *section_name, int remove_option)
@ -47,7 +66,7 @@ int modify_defaults_file(const char *file_location, const char *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");
@ -58,7 +77,7 @@ int modify_defaults_file(const char *file_location, const char *option,
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);
/*
@ -68,15 +87,16 @@ int modify_defaults_file(const char *file_location, const char *option,
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);
@ -94,10 +114,11 @@ int modify_defaults_file(const char *file_location, const char *option,
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;
@ -108,8 +129,9 @@ int modify_defaults_file(const char *file_location, const char *option,
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);