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00020 #include <config.h>
00021 #include <math.h>
00022 #include <drizzled/function/math/mod.h>
00023 #include <drizzled/type/decimal.h>
00024
00025 #include <algorithm>
00026
00027 using namespace std;
00028
00029 namespace drizzled
00030 {
00031
00032 int64_t Item_func_mod::int_op()
00033 {
00034 assert(fixed == 1);
00035 int64_t value= args[0]->val_int();
00036 int64_t val2= args[1]->val_int();
00037 int64_t result;
00038
00039 if ((null_value= args[0]->null_value || args[1]->null_value))
00040 return 0;
00041 if (val2 == 0)
00042 {
00043 signal_divide_by_null();
00044 return 0;
00045 }
00046
00047 if (args[0]->unsigned_flag)
00048 result= args[1]->unsigned_flag ?
00049 ((uint64_t) value) % ((uint64_t) val2) : ((uint64_t) value) % val2;
00050 else
00051 result= args[1]->unsigned_flag ?
00052 (int64_t)(value % ((uint64_t) val2)) : (int64_t)(value % val2);
00053
00054 return result;
00055 }
00056
00057 double Item_func_mod::real_op()
00058 {
00059 assert(fixed == 1);
00060 double value= args[0]->val_real();
00061 double val2= args[1]->val_real();
00062 if ((null_value= args[0]->null_value || args[1]->null_value))
00063 return 0.0;
00064 if (val2 == 0.0)
00065 {
00066 signal_divide_by_null();
00067 return 0.0;
00068 }
00069 return fmod(value,val2);
00070 }
00071
00072
00073 type::Decimal *Item_func_mod::decimal_op(type::Decimal *decimal_value)
00074 {
00075 type::Decimal value1, *val1;
00076 type::Decimal value2, *val2;
00077
00078 val1= args[0]->val_decimal(&value1);
00079 if ((null_value= args[0]->null_value))
00080 return 0;
00081 val2= args[1]->val_decimal(&value2);
00082 if ((null_value= args[1]->null_value))
00083 return 0;
00084 switch (class_decimal_mod(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
00085 val1, val2)) {
00086 case E_DEC_TRUNCATED:
00087 case E_DEC_OK:
00088 return decimal_value;
00089 case E_DEC_DIV_ZERO:
00090 signal_divide_by_null();
00091 default:
00092 null_value= 1;
00093 return 0;
00094 }
00095 }
00096
00097
00098 void Item_func_mod::result_precision()
00099 {
00100 decimals= max(args[0]->decimals, args[1]->decimals);
00101 max_length= max(args[0]->max_length, args[1]->max_length);
00102 }
00103
00104
00105 void Item_func_mod::fix_length_and_dec()
00106 {
00107 Item_num_op::fix_length_and_dec();
00108 maybe_null= 1;
00109 unsigned_flag= args[0]->unsigned_flag;
00110 }
00111
00112 }