Fix for BUG#15110: mysqldump --triggers: does not include DEFINER clause

There are two main idea of this fix:
  - introduce a common function for server and client to split user value
    (<user name>@<host name>) into user name and host name parts;
  - dump DEFINER clause in correct format in mysqldump.


BitKeeper/etc/ignore:
  added client/my_user.c libmysqld/my_user.c sql/my_user.c
client/Makefile.am:
  Use my_user.c in linking of mysqldump executable.
client/mysqldump.c:
  Fix for BUG#15110(mysqldump --triggers: does not include DEFINER clause)
include/Makefile.am:
  Add my_user.c
include/mysql_com.h:
  Introduce a constant for max user length.
libmysqld/Makefile.am:
  Add my_user.c
mysql-test/r/mysqldump.result:
  Update result file.
sql-common/Makefile.am:
  Add my_user.c
sql/Makefile.am:
  Add my_user.c
sql/sp.cc:
  Use constant for max user length.
sql/sp_head.cc:
  Use common function to parse user value.
sql/sql_acl.cc:
  Use constant for max user length.
sql/sql_parse.cc:
  Use constant for max user length.
sql/sql_show.cc:
  Use constant for max user length.
sql/sql_trigger.cc:
  Use constant for max user length.
include/my_user.h:
  A header file for parse_user().
sql-common/my_user.c:
  A new file for parse_user() implementation.

1 files changed, 57 insertions, 0 deletions

diff --git a/sql-common/my_user.c b/sql-common/my_user.c
new file mode 100644
index 00000000000..c39f08e520f
--- /dev/null
+++ b/sql-common/my_user.c
@@ -0,0 +1,57 @@
+/* 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_user.h>
+#include <m_string.h>
+
+
+/*
+  Parse user value to user name and host name parts.
+
+  SYNOPSIS
+    user_id_str     [IN]  User value string (the source).
+    user_id_len     [IN]  Length of the user value.
+    user_name_str   [OUT] Buffer to store user name part.
+                          Must be not less than USERNAME_LENGTH + 1.
+    user_name_len   [OUT] A place to store length of the user name part.
+    host_name_str   [OUT] Buffer to store host name part.
+                          Must be not less than HOSTNAME_LENGTH + 1.
+    host_name_len   [OUT] A place to store length of the host name part.
+*/
+
+void parse_user(const char *user_id_str, uint user_id_len,
+                char *user_name_str, uint *user_name_len,
+                char *host_name_str, uint *host_name_len)
+{
+  char *p= strrchr(user_id_str, '@');
+
+  if (!p)
+  {
+    *user_name_len= 0;
+    *host_name_len= 0;
+  }
+  else
+  {
+    *user_name_len= p - user_id_str;
+    *host_name_len= user_id_len - *user_name_len - 1;
+
+    memcpy(user_name_str, user_id_str, *user_name_len);
+    memcpy(host_name_str, p + 1, *host_name_len);
+  }
+
+  user_name_str[*user_name_len]= 0;
+  host_name_str[*host_name_len]= 0;
+}