Bug#35924 DEFINER should be stored 'quoted' in I_S

The '@' symbol can not be used in the host name according to rfc952.
The fix:
added function check_host_name(LEX_STRING *str)
which checks that all symbols in host name string are valid and
host name length is not more than max host name length
(just moved check_string_length() function from the parser into check_host_name()).


mysql-test/r/create.result:
  test result
mysql-test/t/create.test:
  test case
sql/mysql_priv.h:
  added function check_host_name(LEX_STRING *str)
sql/sql_parse.cc:
  added function check_host_name(LEX_STRING *str)
  which checks that all symbols in host name string are valid and
  host name length is not more than max host name length(HOSTNAME_LENGTH).
sql/sql_yacc.yy:
  using newly added function check_host_name()

1 files changed, 2 insertions, 0 deletions

diff --git a/mysql-test/r/create.result b/mysql-test/r/create.result
index 2d668499df3..d37c1a04daa 100644
--- a/mysql-test/r/create.result
+++ b/mysql-test/r/create.result
@@ -1546,6 +1546,8 @@ SHOW INDEX FROM t1;
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 t1	1	c1	1	c1	A	NULL	NULL	NULL	YES	BTREE	
 DROP TABLE t1;
+create user mysqltest_1@'test@test';
+ERROR HY000: Malformed hostname (illegal symbol: '@')
 CREATE TABLE t1 (a INTEGER AUTO_INCREMENT PRIMARY KEY, b INTEGER NOT NULL);
 INSERT IGNORE INTO t1 (b) VALUES (5);
 CREATE TABLE IF NOT EXISTS t2 (a INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY)