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, 1 insertions, 1 deletions

diff --git a/sql/sql_trigger.cc b/sql/sql_trigger.cc
index bbc32950c2d..c70914edc31 100644
--- a/sql/sql_trigger.cc
+++ b/sql/sql_trigger.cc
@@ -317,7 +317,7 @@ bool Table_triggers_list::create_trigger(THD *thd, TABLE_LIST *tables,
   LEX_STRING dir, file, trigname_file;
   LEX_STRING *trg_def, *name;
   ulonglong *trg_sql_mode;
-  char trg_definer_holder[HOSTNAME_LENGTH + USERNAME_LENGTH + 2];
+  char trg_definer_holder[USER_HOST_BUFF_SIZE];
   LEX_STRING *trg_definer;
   Item_trigger_field *trg_field;
   struct st_trigname trigname;