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.

3 files changed, 45 insertions, 1 deletions

diff --git a/include/Makefile.am b/include/Makefile.am
index 12b8c301b8d..07c32e3127b 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -30,7 +30,8 @@ noinst_HEADERS =	config-win.h config-os2.h config-netware.h \
 			my_nosys.h my_alarm.h queues.h rijndael.h sha1.h \
 			my_aes.h my_tree.h hash.h thr_alarm.h \
 			thr_lock.h t_ctype.h violite.h md5.h base64.h \
-			mysql_version.h.in my_handler.h my_time.h decimal.h
+			mysql_version.h.in my_handler.h my_time.h decimal.h \
+			my_user.h
 
 # mysql_version.h are generated
 CLEANFILES =            mysql_version.h my_config.h readline openssl
diff --git a/include/my_user.h b/include/my_user.h
new file mode 100644
index 00000000000..2bd4208a34c
--- /dev/null
+++ b/include/my_user.h
@@ -0,0 +1,35 @@
+/* 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 */
+
+/*
+  This is a header for libraries containing functions used in both server and
+  only some of clients (but not in libmysql)...
+*/
+
+#ifndef _my_user_h_
+#define _my_user_h_
+
+#include <my_global.h>
+
+C_MODE_START
+
+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);
+
+C_MODE_END
+
+#endif /* _my_user_h_ */
diff --git a/include/mysql_com.h b/include/mysql_com.h
index 1e595cdbba3..ec1c133799f 100644
--- a/include/mysql_com.h
+++ b/include/mysql_com.h
@@ -27,6 +27,14 @@
 #define SERVER_VERSION_LENGTH 60
 #define SQLSTATE_LENGTH 5
 
+/*
+  USER_HOST_BUFF_SIZE -- length of string buffer, that is enough to contain
+  username and hostname parts of the user identifier with trailing zero in
+  MySQL standard format:
+  user_name_part@host_name_part\0
+*/
+#define USER_HOST_BUFF_SIZE HOSTNAME_LENGTH + USERNAME_LENGTH + 2
+
 #define LOCAL_HOST	"localhost"
 #define LOCAL_HOST_NAMEDPIPE "."