diff options
Diffstat (limited to 'mysys/default_modify.c')
| -rw-r--r-- | mysys/default_modify.c | 252 |
1 files changed, 0 insertions, 252 deletions
diff --git a/mysys/default_modify.c b/mysys/default_modify.c deleted file mode 100644 index edf4907cd4b..00000000000 --- a/mysys/default_modify.c +++ /dev/null @@ -1,252 +0,0 @@ -/* 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; version 2 of the License. - - 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 -#define RESERVE 1024 /* Extend buffer with this extent */ - -#ifdef _WIN32 -#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. - - SYNOPSYS - modify_defaults_file() - file_location The location of configuration file to edit - option The name of the option to look for (can be NULL) - option value The value of the option we would like to set (can be NULL) - section_name The name of the section (must be NOT NULL) - remove_option This defines what we want to remove: - - MY_REMOVE_NONE -- nothing to remove; - - MY_REMOVE_OPTION -- remove the specified option; - - MY_REMOVE_SECTION -- remove the specified section; - 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) -{ - FILE *cnf_file; - MY_STAT file_stat; - char linebuff[BUFF_SIZE], *src_ptr, *dst_ptr, *file_buffer; - size_t opt_len= 0, optval_len= 0, sect_len, new_opt_len, reserve_extended; - uint nr_newlines= 0, buffer_size; - my_bool in_section= FALSE, opt_applied= 0; - int reserve_occupied= 0; - DBUG_ENTER("modify_defaults_file"); - - if (!(cnf_file= my_fopen(file_location, O_RDWR | O_BINARY, MYF(0)))) - DBUG_RETURN(2); - - /* my_fstat doesn't use the flag parameter */ - if (my_fstat(my_fileno(cnf_file), &file_stat, MYF(0))) - goto malloc_err; - - if (option && option_value) - { - opt_len= strlen(option); - optval_len= strlen(option_value); - } - - new_opt_len= opt_len + 1 + optval_len + NEWLINE_LEN; - - /* calculate the size of the buffer we need */ - reserve_extended= (opt_len + - 1 + /* For '=' char */ - optval_len + /* Option value len */ - NEWLINE_LEN + /* Space for newline */ - RESERVE); /* Some additional space */ - - buffer_size= (file_stat.st_size + - 1); /* The ending zero */ - - /* - Reserve space to read the contents of the file and some more - for the option we want to add. - */ - if (!(file_buffer= (char*) my_malloc(buffer_size + reserve_extended, - MYF(MY_WME)))) - goto malloc_err; - - sect_len= strlen(section_name); - - for (dst_ptr= file_buffer; fgets(linebuff, BUFF_SIZE, cnf_file); ) - { - /* Skip over whitespaces */ - for (src_ptr= linebuff; my_isspace(&my_charset_latin1, *src_ptr); - src_ptr++) - {} - - if (!*src_ptr) /* Empty line */ - { - nr_newlines++; - continue; - } - - /* correct the option (if requested) */ - if (option && 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')) - { - char *old_src_ptr= src_ptr; - src_ptr= strend(src_ptr+ opt_len); /* Find the end of the line */ - - /* could be negative */ - reserve_occupied+= (int) new_opt_len - (int) (src_ptr - old_src_ptr); - if (reserve_occupied >= (int) reserve_extended) - { - reserve_extended= (uint) reserve_occupied + RESERVE; - if (!(file_buffer= (char*) my_realloc(file_buffer, buffer_size + - reserve_extended, - MYF(MY_WME|MY_FREE_ON_ERROR)))) - goto malloc_err; - } - opt_applied= 1; - dst_ptr= add_option(dst_ptr, option_value, option, remove_option); - } - else - { - /* - If we are going to the new group and have an option to apply, do - it now. If we are removing a single option or the whole section - this will only trigger opt_applied flag. - */ - - 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 */ - reserve_occupied= new_opt_len+ opt_len + 1 + NEWLINE_LEN; - } - - for (; nr_newlines; nr_newlines--) - dst_ptr= strmov(dst_ptr, NEWLINE); - - /* Skip the section if MY_REMOVE_SECTION was given */ - if (!in_section || remove_option != MY_REMOVE_SECTION) - dst_ptr= strmov(dst_ptr, linebuff); - } - /* Look for a section */ - if (*src_ptr == '[') - { - /* Copy the line to the buffer */ - if (!strncmp(++src_ptr, section_name, sect_len)) - { - src_ptr+= sect_len; - /* Skip over whitespaces. They are allowed after section name */ - for (; my_isspace(&my_charset_latin1, *src_ptr); src_ptr++) - {} - - if (*src_ptr != ']') - { - in_section= FALSE; - continue; /* Missing closing parenthesis. Assume this was no group */ - } - - if (remove_option == MY_REMOVE_SECTION) - dst_ptr= dst_ptr - strlen(linebuff); - - in_section= TRUE; - } - else - in_section= FALSE; /* mark that this section is of no interest to us */ - } - } - - /* - File ended. Apply an option or set opt_applied flag (in case of - MY_REMOVE_SECTION) so that the changes are saved. Do not do anything - if we are removing non-existent option. - */ - - if (!opt_applied && in_section && (remove_option != MY_REMOVE_OPTION)) - { - /* New option still remains to apply at the end */ - if (!remove_option && *(dst_ptr - 1) != '\n') - dst_ptr= strmov(dst_ptr, NEWLINE); - dst_ptr= add_option(dst_ptr, option_value, option, remove_option); - opt_applied= 1; - } - for (; nr_newlines; nr_newlines--) - dst_ptr= strmov(dst_ptr, NEWLINE); - - if (opt_applied) - { - /* Don't write the file if there are no changes to be made */ - if (my_chsize(my_fileno(cnf_file), (my_off_t) (dst_ptr - file_buffer), 0, - MYF(MY_WME)) || - my_fseek(cnf_file, 0, MY_SEEK_SET, MYF(0)) || - my_fwrite(cnf_file, (uchar*) file_buffer, (size_t) (dst_ptr - file_buffer), - MYF(MY_NABP))) - goto err; - } - if (my_fclose(cnf_file, MYF(MY_WME))) - DBUG_RETURN(1); - - my_free(file_buffer); - DBUG_RETURN(0); - -err: - my_free(file_buffer); -malloc_err: - my_fclose(cnf_file, MYF(0)); - DBUG_RETURN(1); /* out of resources */ -} - - -static char *add_option(char *dst, const char *option_value, - const char *option, int remove_option) -{ - if (!remove_option) - { - dst= strmov(dst, option); - if (*option_value) - { - *dst++= '='; - dst= strmov(dst, option_value); - } - /* add a newline */ - dst= strmov(dst, NEWLINE); - } - return dst; -} |