Bug#31081 server crash in regexp function

Problem: The "regex" library written by Henry Spencer
does not support tricky character sets like UCS2.
Fix: convert tricky character sets to UTF8 before calling
regex functions.


mysql-test/r/ctype_uca.result:
  Adding tests
mysql-test/r/ctype_ucs.result:
  Adding tests
mysql-test/r/ctype_utf8.result:
  Adding tests
mysql-test/r/func_regexp.result:
  Adding tests
mysql-test/t/ctype_uca.test:
  Adding tests
mysql-test/t/ctype_ucs.test:
  Adding tests
mysql-test/t/ctype_utf8.test:
  Adding tests
mysql-test/t/func_regexp.test:
  Adding tests
sql/item_cmpfunc.cc:
  - Adding new method Item_func_regex::regcomp()
  to share more code between fix_fields() and val_int()
  - Adding conversion from ASCII-incompatible charsets like UCS2
  to UTF8, because the "regexp" does not support these charsets
  - Additional optimization: calculate flags for regcomp only
    once in fix_fields, instead of every regcomp()
sql/item_cmpfunc.h:
  Adding prototypes for new members and methods
mysql-test/include/ctype_regex.inc:
  New BitKeeper file ``mysql-test/include/ctype_regex.inc''
  
  Moving common regular expression tests into a separate
  file and uncluding it into func_regexp and into many ctype_xxx tests.

1 files changed, 13 insertions, 1 deletions

diff --git a/mysql-test/r/func_regexp.result b/mysql-test/r/func_regexp.result
index 584c8a9b820..752ec3a5810 100644
--- a/mysql-test/r/func_regexp.result
+++ b/mysql-test/r/func_regexp.result
@@ -1,5 +1,17 @@
 drop table if exists t1;
-create table t1 (s1 char(64),s2 char(64));
+set names latin1;
+drop table if exists t1;
+create table t1 as
+select repeat(' ', 64) as s1, repeat(' ',64) as s2
+union
+select null, null;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `s1` varchar(64) default NULL,
+  `s2` varchar(64) default NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+delete from t1;
 insert into t1 values('aaa','aaa');
 insert into t1 values('aaa|qqq','qqq');
 insert into t1 values('gheis','^[^a-dXYZ]+$');