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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <drizzled/function/math/divide.h>
#include <drizzled/session.h>
#include <drizzled/system_variables.h>
#include <algorithm>
using namespace std;
namespace drizzled {
double Item_func_div::real_op()
{
assert(fixed == 1);
double value= args[0]->val_real();
double val2= args[1]->val_real();
if ((null_value= args[0]->null_value || args[1]->null_value))
return 0.0;
if (val2 == 0.0)
{
signal_divide_by_null();
return 0.0;
}
return fix_result(value/val2);
}
type::Decimal *Item_func_div::decimal_op(type::Decimal *decimal_value)
{
type::Decimal value1, *val1;
type::Decimal value2, *val2;
int err;
val1= args[0]->val_decimal(&value1);
if ((null_value= args[0]->null_value))
return 0;
val2= args[1]->val_decimal(&value2);
if ((null_value= args[1]->null_value))
return 0;
if ((err= class_decimal_div(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
val1, val2, prec_increment)) > 3)
{
if (err == E_DEC_DIV_ZERO)
signal_divide_by_null();
null_value= 1;
return 0;
}
return decimal_value;
}
void Item_func_div::result_precision()
{
uint32_t precision= min(args[0]->decimal_precision() + prec_increment,
(unsigned int)DECIMAL_MAX_PRECISION);
/* Integer operations keep unsigned_flag if one of arguments is unsigned */
if (result_type() == INT_RESULT)
unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
else
unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
decimals= min(args[0]->decimals + prec_increment, (unsigned int)DECIMAL_MAX_SCALE);
max_length= class_decimal_precision_to_length(precision, decimals,
unsigned_flag);
}
void Item_func_div::fix_length_and_dec()
{
prec_increment= session->variables.div_precincrement;
Item_num_op::fix_length_and_dec();
switch(hybrid_type)
{
case REAL_RESULT:
{
decimals= max(args[0]->decimals,args[1]->decimals)+prec_increment;
set_if_smaller(decimals, NOT_FIXED_DEC);
max_length= args[0]->max_length - args[0]->decimals + decimals;
uint32_t tmp= float_length(decimals);
set_if_smaller(max_length,tmp);
break;
}
case INT_RESULT:
hybrid_type= DECIMAL_RESULT;
result_precision();
break;
case DECIMAL_RESULT:
result_precision();
break;
default:
assert(0);
}
maybe_null= 1; // devision by zero
return;
}
} /* namespace drizzled */
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