Fix for bug #11557 (Error during rounding of the DEFAULT values)

mysql-test/r/type_newdecimal.result:
  test result fixed
mysql-test/t/type_newdecimal.test:
  test case added
strings/decimal.c:
  Code to check 999.9 -> 1000 case should work always

mysql-test/r/type_newdecimal.result

@@ -955,3 +955,26 @@ t1	CREATE TABLE `t1` (
   `sl` decimal(5,5) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
+create table t1 (
+f1 decimal unsigned not null default 17.49, 
+f2 decimal unsigned not null default 17.68, 
+f3 decimal unsigned not null default 99.2, 
+f4 decimal unsigned not null default 99.7, 
+f5 decimal unsigned not null default 104.49, 
+f6 decimal unsigned not null default 199.91, 
+f7 decimal unsigned not null default 999.9, 
+f8 decimal unsigned not null default 9999.99);
+Warnings:
+Note	1265	Data truncated for column 'f1' at row 1
+Note	1265	Data truncated for column 'f2' at row 1
+Note	1265	Data truncated for column 'f3' at row 1
+Note	1265	Data truncated for column 'f4' at row 1
+Note	1265	Data truncated for column 'f5' at row 1
+Note	1265	Data truncated for column 'f6' at row 1
+Note	1265	Data truncated for column 'f7' at row 1
+Note	1265	Data truncated for column 'f8' at row 1
+insert into t1 (f1) values (1);
+select * from t1;
+f1	f2	f3	f4	f5	f6	f7	f8
+1	18	99	100	104	200	1000	10000
+drop table t1;

mysql-test/t/type_newdecimal.test

@@ -998,3 +998,20 @@ create table t1 (sl decimal(0,30));
 create table t1 (sl decimal(5, 5));
 show create table t1;
 drop table t1;
+
+#
+# Bug 11557 (DEFAULT values rounded improperly
+#
+create table t1 (
+       f1 decimal unsigned not null default 17.49, 
+       f2 decimal unsigned not null default 17.68, 
+       f3 decimal unsigned not null default 99.2, 
+       f4 decimal unsigned not null default 99.7, 
+       f5 decimal unsigned not null default 104.49, 
+       f6 decimal unsigned not null default 199.91, 
+       f7 decimal unsigned not null default 999.9, 
+       f8 decimal unsigned not null default 9999.99);
+insert into t1 (f1) values (1);
+select * from t1;
+drop table t1;
+

strings/decimal.c

@@ -1443,6 +1443,7 @@ decimal_round(decimal_t *from, decimal_t *to, int scale,
       intg1=ROUND_UP(from->intg +
                      (((intg0 + frac0)>0) && (from->buf[0] == DIG_MAX)));
   dec1 *buf0=from->buf, *buf1=to->buf, x, y, carry=0;
+  int first_dig;
 
   sanity(to);
 
@@ -1578,14 +1579,6 @@ decimal_round(decimal_t *from, decimal_t *to, int scale,
       *buf1=1;
       to->intg++;
     }
-    else
-    {
-      /* Here we  check 999.9 -> 1000 case when we need to increase intg */
-      int first_dig= to->intg % DIG_PER_DEC1;
-      /* first_dig==0 should be handled above in the 'if' */
-      if (first_dig && (*buf1 >= powers10[first_dig]))
-        to->intg++;
-    }
   }
   else
   {
@@ -1606,6 +1599,12 @@ decimal_round(decimal_t *from, decimal_t *to, int scale,
       }
     }
   }
+
+  /* Here we  check 999.9 -> 1000 case when we need to increase intg */
+  first_dig= to->intg % DIG_PER_DEC1;
+  if (first_dig && (*buf1 >= powers10[first_dig]))
+    to->intg++;
+
   if (scale<0)
     scale=0;