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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 <math.h>
#include <drizzled/error.h>
#include <drizzled/field.h>
#include <drizzled/item/float.h>
#include <drizzled/item/num.h>
#include <drizzled/item/string.h>
namespace drizzled
{
extern const CHARSET_INFO *system_charset_info;
static uint32_t nr_of_decimals(const char *str, const char *end)
{
const char *decimal_point;
/* Find position for '.' */
for (;;)
{
if (str == end)
return 0;
if (*str == 'e' || *str == 'E')
return NOT_FIXED_DEC;
if (*str++ == '.')
break;
}
decimal_point= str;
for (; my_isdigit(system_charset_info, *str) ; str++)
;
if (*str == 'e' || *str == 'E')
return NOT_FIXED_DEC;
return (uint32_t) (str - decimal_point);
}
String *Item_float::val_str(String *str)
{
// following assert is redundant, because fixed=1 assigned in constructor
assert(fixed == 1);
str->set_real(value,decimals,&my_charset_bin);
return str;
}
int64_t Item_float::val_int()
{
assert(fixed == 1);
if (value <= (double) INT64_MIN)
{
return INT64_MIN;
}
else if (value >= (double) (uint64_t) INT64_MAX)
{
return INT64_MAX;
}
return (int64_t) rint(value);
}
type::Decimal *Item_float::val_decimal(type::Decimal *decimal_value)
{
// following assert is redundant, because fixed=1 assigned in constructor
assert(fixed == 1);
double2_class_decimal(E_DEC_FATAL_ERROR, value, decimal_value);
return (decimal_value);
}
/**
This function is only called during parsing. We will signal an error if
value is not a true double value (overflow)
*/
Item_float::Item_float(const char *str_arg, uint32_t length)
{
int error;
char *end_not_used;
value= my_strntod(&my_charset_bin, (char*) str_arg, length, &end_not_used,
&error);
if (error)
{
/*
Note that we depend on that str_arg is null terminated, which is true
when we are in the parser
*/
assert(str_arg[length] == 0);
my_error(ER_ILLEGAL_VALUE_FOR_TYPE, MYF(0), "double", (char*) str_arg);
}
presentation= name=(char*) str_arg;
decimals=(uint8_t) nr_of_decimals(str_arg, str_arg+length);
max_length=length;
fixed= 1;
}
int Item_float::save_in_field(Field *field, bool)
{
double nr= val_real();
if (null_value)
return set_field_to_null(field);
field->set_notnull();
return field->store(nr);
}
void Item_float::print(String *str, enum_query_type)
{
if (presentation)
{
str->append(presentation);
return;
}
char buffer[20];
String num(buffer, sizeof(buffer), &my_charset_bin);
num.set_real(value, decimals, &my_charset_bin);
str->append(num);
}
/*
hex item
In string context this is a binary string.
In number context this is a int64_t value.
*/
bool Item_float::eq(const Item *arg, bool) const
{
if (arg->basic_const_item() && arg->type() == type())
{
/*
We need to cast off const to call val_int(). This should be OK for
a basic constant.
*/
Item *item= (Item*) arg;
return item->val_real() == value;
}
return false;
}
Item *Item_static_float_func::safe_charset_converter(const CHARSET_INFO * const)
{
Item_string *conv;
char buf[64];
String *s, tmp(buf, sizeof(buf), &my_charset_bin);
s= val_str(&tmp);
if ((conv= new Item_static_string_func(func_name, s->ptr(), s->length(),
s->charset())))
{
conv->str_value.copy();
conv->str_value.mark_as_const();
}
return conv;
}
} /* namespace drizzled */
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