C++ (Cpp) OCINumberIntPower Examples

Example #1

File: ocinumber.c Project: ashleysharpe/ruby-oci8

/*
 *  call-seq:
 *    onum ** other   -> oranumber
 *
 *  Raises <i>onum</i> the <i>other</i> power.
 */
static VALUE onum_power(VALUE lhs, VALUE rhs)
{
    OCIError *errhp = oci8_errhp;
    OCINumber n;
    OCINumber r;

    if (FIXNUM_P(rhs)) {
        chkerr(OCINumberIntPower(errhp, _NUMBER(lhs), FIX2INT(rhs), &r));
    } else {
        /* change to OCINumber */
        if (!set_oci_number_from_num(&n, rhs, 0, errhp))
            return rb_num_coerce_bin(lhs, rhs, id_power);
        chkerr(OCINumberPower(errhp, _NUMBER(lhs), &n, &r));
    }
    return oci8_make_ocinumber(&r, errhp);
}

Example #2

File: ocinumber.c Project: adanmayer/ruby-oci8

/* 1 - success, 0 - error */
static int set_oci_number_from_num(OCINumber *result, VALUE num, int force, OCIError *errhp)
{
    signed long sl;
    double dbl;

    if (!RTEST(rb_obj_is_kind_of(num, rb_cNumeric)))
        rb_raise(rb_eTypeError, "expect Numeric but %s", rb_class2name(CLASS_OF(num)));
    if (rb_respond_to(num, id_finite_p) && !RTEST(rb_funcall(num, id_finite_p, 0))) {
        rb_raise(rb_eTypeError, "cannot accept number which isn't finite.");
    }
    switch (rb_type(num)) {
    case T_FIXNUM:
        /* set from long. */
        sl = NUM2LONG(num);
        oci_lc(OCINumberFromInt(errhp, &sl, sizeof(sl), OCI_NUMBER_SIGNED, result));
        return 1;
    case T_FLOAT:
        /* set from double. */
        dbl = NUM2DBL(num);
        oci_lc(OCINumberFromReal(errhp, &dbl, sizeof(dbl), result));
        return 1;
    case T_BIGNUM:
        /* change via string. */
        num = rb_big2str(num, 10);
        set_oci_number_from_str(result, num, Qnil, Qnil, errhp);
        return 1;
    }
    if (RTEST(rb_obj_is_instance_of(num, cOCINumber))) {
        /* OCI::Number */
        oci_lc(OCINumberAssign(errhp, DATA_PTR(num), result));
        return 1;
    }
    if (rb_respond_to(num, id_split)) {
        /* BigDecimal */
        VALUE split = rb_funcall(num, id_split, 0);

        if (TYPE(split) == T_ARRAY && RARRAY_LEN(split) == 4) {
            /*
             * sign, significant_digits, base, exponent = num.split
             * onum = sign * "0.#{significant_digits}".to_f * (base ** exponent)
             */
            VALUE *ary = RARRAY_PTR(split);
            int sign;
            OCINumber digits;
            int exponent;
            int digits_len;
            OCINumber work;

            /* check sign */
            if (TYPE(ary[0]) != T_FIXNUM) {
                goto is_not_big_decimal;
            }
            sign = FIX2INT(ary[0]);
            /* check digits */
            StringValue(ary[1]);
            digits_len = RSTRING_LEN(ary[1]);
            set_oci_number_from_str(&digits, ary[1], Qnil, Qnil, errhp);
            /* check base */
            if (TYPE(ary[2]) != T_FIXNUM || FIX2LONG(ary[2]) != 10) {
                goto is_not_big_decimal;
            }
            /* check exponent */
            if (TYPE(ary[3]) != T_FIXNUM) {
                goto is_not_big_decimal;
            }
            exponent = FIX2INT(ary[3]);

            if (have_OCINumberShift) {
                /* Oracle 8.1 or upper */
                oci_lc(OCINumberShift(errhp, &digits, exponent - digits_len, &work));
            } else {
                /* Oracle 8.0 */
                int n = 10;
                OCINumber base;
                OCINumber exp;

                oci_lc(OCINumberFromInt(errhp, &n, sizeof(n), OCI_NUMBER_SIGNED, &base));
                oci_lc(OCINumberIntPower(errhp, &base, exponent - digits_len, &exp));
                oci_lc(OCINumberMul(errhp, &digits, &exp, &work));
            }
            if (sign >= 0) {
                oci_lc(OCINumberAssign(errhp, &work, result));
            } else {
                oci_lc(OCINumberNeg(errhp, &work, result));
            }
            return 1;
        }
    }
is_not_big_decimal:
    if (rb_respond_to(num, id_numerator) && rb_respond_to(num, id_denominator)) {
        /* Rational */
        OCINumber numerator;
        OCINumber denominator;

        if (set_oci_number_from_num(&numerator, rb_funcall(num, id_numerator, 0), 0, errhp) &&
            set_oci_number_from_num(&denominator, rb_funcall(num, id_denominator, 0), 0, errhp)) {
            oci_lc(OCINumberDiv(errhp, &numerator, &denominator, result));
            return 1;
        }
    }
    if (force) {
        /* change via string as a last resort. */
        /* TODO: if error, raise TypeError instead of OCI::Error */
        set_oci_number_from_str(result, num, Qnil, Qnil, errhp);
        return 1;
    }
    return 0;
}