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SUBSTR with negative argument didn't work

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with multi-byte strings, length() instead
of numchars() where used in a mistake.
This commit is contained in:
unknown
2005-05-09 20:55:06 +05:00
parent b8ea7d4b8a
commit 66446b31b7
3 changed files with 10 additions and 1 deletions
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3
mysql-test/r/ctype_utf8.result
View File

@ -817,6 +817,9 @@ drop table t1;
select 'c' like '\_' as want0;
want0
0
SELECT SUBSTR('вася',-2);
SUBSTR('вася',-2)
ся
create table t1 (id integer, a varchar(100) character set utf8 collate utf8_unicode_ci);
insert into t1 values (1, 'Test');
select * from t1 where soundex(a) = soundex('Test');

6
mysql-test/t/ctype_utf8.test
View File

@ -666,6 +666,12 @@ drop table t1;
#
select 'c' like '\_' as want0;
#
# SUBSTR with negative offset didn't work with multi-byte strings
#
SELECT SUBSTR('вася',-2);
#
# Bug #7730 Server crash using soundex on an utf8 table
#

2
sql/item_strfunc.cc
View File

@ -1023,7 +1023,7 @@ String *Item_func_substr::val_str(String *str)
if ((null_value=(args[0]->null_value || args[1]->null_value ||
(arg_count == 3 && args[2]->null_value))))
return 0; /* purecov: inspected */
start= (int32)((start < 0) ? res->length() + start : start -1);
start= (int32)((start < 0) ? res->numchars() + start : start -1);
start=res->charpos(start);
length=res->charpos(length,start);
if (start < 0 || (uint) start+1 > res->length() || length <= 0)