Datum decimal64_numeric(PG_FUNCTION_ARGS)
{
PGDecimal64 a = PG_GETARG_DECIMAL64(0);
Datum ret;
char s[DECDOUBLE_String];
decDoubleToString(&a, s);
ret = DirectFunctionCall3(numeric_in,
CStringGetDatum(s), Int32GetDatum(0), Int32GetDatum(-1));
PG_RETURN_DATUM(ret);
}
Datum decimal64_out(PG_FUNCTION_ARGS)
{
PGDecimal64 d = PG_GETARG_DECIMAL64(0);
char *s = (char *) palloc(DECDOUBLE_String);
if (!s) {
elog(ERROR, "OOM");
}
decDoubleToString(&d, s);
PG_RETURN_CSTRING(s);
}
Datum decimal64_float8(PG_FUNCTION_ARGS)
{
PGDecimal64 a = PG_GETARG_DECIMAL64(0);
char s[DECDOUBLE_String];
char *endp = 0;
double d;
decDoubleToString(&a, s);
errno = 0;
d = strtod(s, &endp);
if (endp == s || errno != 0) {
elog(ERROR, "cannot convert decimal64 to float8");
}
PG_RETURN_FLOAT8(d);
}
int testDecDouble()
{
int i;
decDouble a, b;
decContext set;
char string[DECDOUBLE_String];
decContextDefault(&set, DEC_INIT_DECDOUBLE); // initialize
decDoubleFromString(&a, "0.13", &set);
decDoubleFromString(&b, "8.7", &set);
for (i = 0; i < 10; i++)
decDoubleAdd(&b, &a, &b, &set); // b += a;
decDoubleToString(&b, string);
printf("dec064: 8.7 + 0.13 * 10 => %s\n", string);
return 0;
}