1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/* - 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 */
|