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/* - mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 MySQL
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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/field/real.h>
#include <drizzled/error.h>
#include <drizzled/table.h>
#include <math.h>
#include <limits>
using namespace std;
namespace drizzled
{
extern const double log_10[309];
/*
Floating-point numbers
*/
unsigned char *
Field_real::pack(unsigned char *to, const unsigned char *from,
uint32_t max_length, bool low_byte_first)
{
assert(max_length >= pack_length());
#ifdef WORDS_BIGENDIAN
if (low_byte_first != getTable()->getShare()->db_low_byte_first)
{
const unsigned char *dptr= from + pack_length();
while (dptr-- > from)
*to++ = *dptr;
return(to);
}
else
#endif
return(Field::pack(to, from, max_length, low_byte_first));
}
const unsigned char *
Field_real::unpack(unsigned char *to, const unsigned char *from,
uint32_t param_data, bool low_byte_first)
{
#ifdef WORDS_BIGENDIAN
if (low_byte_first != getTable()->getShare()->db_low_byte_first)
{
const unsigned char *dptr= from + pack_length();
while (dptr-- > from)
*to++ = *dptr;
return(from + pack_length());
}
else
#endif
return(Field::unpack(to, from, param_data, low_byte_first));
}
/*
If a field has fixed length, truncate the double argument pointed to by 'nr'
appropriately.
Also ensure that the argument is within [-max_value; max_value] range.
*/
int Field_real::truncate(double *nr, double max_value)
{
int error= 1;
double res= *nr;
if (res == numeric_limits<double>::quiet_NaN())
{
res= 0;
set_null();
set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE, 1);
goto end;
}
if (!not_fixed)
{
uint32_t order= field_length - dec;
uint32_t step= array_elements(log_10) - 1;
max_value= 1.0;
for (; order > step; order-= step)
max_value*= log_10[step];
max_value*= log_10[order];
max_value-= 1.0 / log_10[dec];
/* Check for infinity so we don't get NaN in calculations */
if (res != numeric_limits<double>::infinity())
{
double tmp= rint((res - floor(res)) * log_10[dec]) / log_10[dec];
res= floor(res) + tmp;
}
}
if (res < -max_value)
{
res= -max_value;
set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE, 1);
}
else if (res > max_value)
{
res= max_value;
set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE, 1);
}
else
error= 0;
end:
*nr= res;
return error;
}
int Field_real::store_decimal(const type::Decimal *dm)
{
double dbl;
class_decimal2double(E_DEC_FATAL_ERROR, dm, &dbl);
return store(dbl);
}
type::Decimal *Field_real::val_decimal(type::Decimal *decimal_value) const
{
ASSERT_COLUMN_MARKED_FOR_READ;
double2_class_decimal(E_DEC_FATAL_ERROR, val_real(), decimal_value);
return decimal_value;
}
} /* namespace drizzled */
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