Fixed lp:886479 "[PATCH] plugin boolean result"

Thanks to Maarten Vanraes for the patch


sql/sql_plugin.cc:
  Fix plugin boolean variables to receive the value "1", not "-1", when they are set to 1.
  Aside from being bizarre, the existing behavior is unportable: machines where char is unsigned print "255" instead.

sql/sql_plugin.cc

@@ -2203,7 +2203,7 @@ static int check_func_bool(THD *thd, struct st_mysql_sys_var *var,
   {
     if (value->val_int(value, &tmp) < 0)
       goto err;
-    if (tmp > 1)
+    if (tmp != 0 && tmp != 1)
     {
       llstr(tmp, buff);
       strvalue= buff;
@@ -2211,7 +2211,7 @@ static int check_func_bool(THD *thd, struct st_mysql_sys_var *var,
     }
     result= (int) tmp;
   }
-  *(my_bool *) save= -result;
+  *(my_bool *) save= result ? 1 : 0;
   return 0;
 err:
   my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), var->name, strvalue);
@@ -2392,7 +2392,7 @@ err:
 static void update_func_bool(THD *thd, struct st_mysql_sys_var *var,
                              void *tgt, const void *save)
 {
-  *(my_bool *) tgt= *(my_bool *) save ? TRUE : FALSE;
+  *(my_bool *) tgt= *(my_bool *) save ? 1 : 0;
 }