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/* - mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 MySQL
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include <drizzled/server_includes.h>
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#include <drizzled/field/real.h>
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#include <drizzled/error.h>
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#include <drizzled/table.h>
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#include <drizzled/util/math.h>
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#if defined(CMATH_NAMESPACE)
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using namespace CMATH_NAMESPACE;
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Floating-point numbers
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Field_real::pack(unsigned char *to, const unsigned char *from,
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uint32_t max_length, bool low_byte_first)
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assert(max_length >= pack_length());
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#ifdef WORDS_BIGENDIAN
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if (low_byte_first != table->s->db_low_byte_first)
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const unsigned char *dptr= from + pack_length();
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return(Field::pack(to, from, max_length, low_byte_first));
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Field_real::unpack(unsigned char *to, const unsigned char *from,
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uint32_t param_data, bool low_byte_first)
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#ifdef WORDS_BIGENDIAN
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if (low_byte_first != table->s->db_low_byte_first)
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const unsigned char *dptr= from + pack_length();
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return(from + pack_length());
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return(Field::unpack(to, from, param_data, low_byte_first));
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If a field has fixed length, truncate the double argument pointed to by 'nr'
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Also ensure that the argument is within [-max_value; max_value] range.
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int Field_real::truncate(double *nr, double max_value)
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set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE, 1);
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uint32_t order= field_length - dec;
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uint32_t step= array_elements(log_10) - 1;
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for (; order > step; order-= step)
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max_value*= log_10[step];
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max_value*= log_10[order];
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max_value-= 1.0 / log_10[dec];
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/* Check for infinity so we don't get NaN in calculations */
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double tmp= rint((res - floor(res)) * log_10[dec]) / log_10[dec];
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res= floor(res) + tmp;
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if (res < -max_value)
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set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE, 1);
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else if (res > max_value)
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set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE, 1);
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int Field_real::store_decimal(const my_decimal *dm)
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my_decimal2double(E_DEC_FATAL_ERROR, dm, &dbl);
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my_decimal *Field_real::val_decimal(my_decimal *decimal_value)
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double2my_decimal(E_DEC_FATAL_ERROR, val_real(), decimal_value);
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return decimal_value;