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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
*
* 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 "format.h"
#include <limits>
using namespace std;
namespace drizzled
{
/**
Change a number to format '3,333,333,333.000'.
This should be 'internationalized' sometimes.
*/
const int FORMAT_MAX_DECIMALS= 30;
void Item_func_format::fix_length_and_dec()
{
collation.set(default_charset());
uint32_t char_length= args[0]->max_length/args[0]->collation.collation->mbmaxlen;
max_length= ((char_length + (char_length-args[0]->decimals)/3) *
collation.collation->mbmaxlen);
}
/**
@todo
This needs to be fixed for multi-byte character set where numbers
are stored in more than one byte
*/
String *Item_func_format::val_str(String *str)
{
uint32_t length;
uint32_t str_length;
/* Number of decimal digits */
int dec;
/* Number of characters used to represent the decimals, including '.' */
uint32_t dec_length;
int diff;
assert(fixed == 1);
dec= (int) args[1]->val_int();
if (args[1]->null_value)
{
null_value=1;
return NULL;
}
dec= set_zone(dec, 0, FORMAT_MAX_DECIMALS);
dec_length= dec ? dec+1 : 0;
null_value=0;
if (args[0]->result_type() == DECIMAL_RESULT ||
args[0]->result_type() == INT_RESULT)
{
my_decimal dec_val, rnd_dec, *res;
res= args[0]->val_decimal(&dec_val);
if ((null_value=args[0]->null_value))
return 0;
my_decimal_round(E_DEC_FATAL_ERROR, res, dec, false, &rnd_dec);
my_decimal2string(E_DEC_FATAL_ERROR, &rnd_dec, 0, 0, 0, str);
str_length= str->length();
if (rnd_dec.sign())
str_length--;
}
else
{
double nr= args[0]->val_real();
if ((null_value=args[0]->null_value))
return 0;
nr= my_double_round(nr, (int64_t) dec, false, false);
/* Here default_charset() is right as this is not an automatic conversion */
str->set_real(nr, dec, default_charset());
if (nr == numeric_limits<double>::quiet_NaN())
return str;
str_length=str->length();
if (nr < 0)
str_length--; // Don't count sign
}
/* We need this test to handle 'nan' values */
if (str_length >= dec_length+4)
{
char *tmp,*pos;
length= str->length()+(diff=((int)(str_length- dec_length-1))/3);
str= copy_if_not_alloced(&tmp_str,str,length);
str->length(length);
tmp= (char*) str->ptr()+length - dec_length-1;
for (pos= (char*) str->ptr()+length-1; pos != tmp; pos--)
pos[0]= pos[-diff];
while (diff)
{
*pos= *(pos - diff);
pos--;
*pos= *(pos - diff);
pos--;
*pos= *(pos - diff);
pos--;
pos[0]=',';
pos--;
diff--;
}
}
return str;
}
void Item_func_format::print(String *str, enum_query_type query_type)
{
str->append(STRING_WITH_LEN("format("));
args[0]->print(str, query_type);
str->append(',');
args[1]->print(str, query_type);
str->append(')');
}
} /* namespace drizzled */
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