diff options
Diffstat (limited to 'sql/my_decimal.h')
-rw-r--r-- | sql/my_decimal.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/sql/my_decimal.h b/sql/my_decimal.h index 6a0d05921ec..ee023438f20 100644 --- a/sql/my_decimal.h +++ b/sql/my_decimal.h @@ -86,12 +86,31 @@ inline int my_decimal_int_part(uint precision, uint decimals) class my_decimal :public decimal_t { + /* + Several of the routines in strings/decimal.c have had buffer + overrun/underrun problems. These are *not* caught by valgrind. + To catch them, we allocate dummy fields around the buffer, + and test that their values do not change. + */ +#if !defined(DBUG_OFF) + int foo1; +#endif + decimal_digit_t buffer[DECIMAL_BUFF_LENGTH]; +#if !defined(DBUG_OFF) + int foo2; + static const int test_value= 123; +#endif + public: void init() { +#if !defined(DBUG_OFF) + foo1= test_value; + foo2= test_value; +#endif len= DECIMAL_BUFF_LENGTH; buf= buffer; #if !defined (HAVE_purify) && !defined(DBUG_OFF) @@ -104,6 +123,17 @@ public: { init(); } + ~my_decimal() + { + sanity_check(); + } + + void sanity_check() + { + DBUG_ASSERT(foo1 == test_value); + DBUG_ASSERT(foo2 == test_value); + } + void fix_buffer_pointer() { buf= buffer; } bool sign() const { return decimal_t::sign; } |