release/src/router/mysql/sql-common/my_user.c

   1 /*
   2    Copyright (c) 2006-2008 MySQL AB, 2009 Sun Microsystems, Inc.
   3    Use is subject to license terms.
   4
   5  This program is free software; you can redistribute it and/or modify
   6  it under the terms of the GNU General Public License as published by
   7  the Free Software Foundation; version 2 of the License.
   8
   9  This program is distributed in the hope that it will be useful,
  10  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  GNU General Public License for more details.
  13
  14  You should have received a copy of the GNU General Public License
  15  along with this program; if not, write to the Free Software
  16  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
  17 */
  18
  19 #include <my_user.h>
  20 #include <m_string.h>
  21 #include <mysql_com.h>
  22
  23 /*
  24   Parse user value to user name and host name parts.
  25
  26   SYNOPSIS
  27     user_id_str     [IN]  User value string (the source).
  28     user_id_len     [IN]  Length of the user value.
  29     user_name_str   [OUT] Buffer to store user name part.
  30                           Must be not less than USERNAME_LENGTH + 1.
  31     user_name_len   [OUT] A place to store length of the user name part.
  32     host_name_str   [OUT] Buffer to store host name part.
  33                           Must be not less than HOSTNAME_LENGTH + 1.
  34     host_name_len   [OUT] A place to store length of the host name part.
  35 */
  36
  37 void parse_user(const char *user_id_str, size_t user_id_len,
  38                 char *user_name_str, size_t *user_name_len,
  39                 char *host_name_str, size_t *host_name_len)
  40 {
  41   char *p= strrchr(user_id_str, '@');
  42
  43   if (!p)
  44   {
  45     *user_name_len= 0;
  46     *host_name_len= 0;
  47   }
  48   else
  49   {
  50     *user_name_len= (uint) (p - user_id_str);
  51     *host_name_len= (uint) (user_id_len - *user_name_len - 1);
  52
  53     if (*user_name_len > USERNAME_LENGTH)
  54       *user_name_len= USERNAME_LENGTH;
  55
  56     if (*host_name_len > HOSTNAME_LENGTH)
  57       *host_name_len= HOSTNAME_LENGTH;
  58
  59     memcpy(user_name_str, user_id_str, *user_name_len);
  60     memcpy(host_name_str, p + 1, *host_name_len);
  61   }
  62
  63   user_name_str[*user_name_len]= 0;
  64   host_name_str[*host_name_len]= 0;
  65 }