FreeWRL

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JS/js/prdtoa.c  view on Meta::CPAN

	initialized = PR_TRUE;
}
#endif


/* nspr2 watcom bug ifdef omitted */

PR_PUBLIC_API(double)
PR_strtod(CONST char *s00, char **se)
{
	int32 bb2, bb5, bbe, bd2, bd5, bbbits, bs2, c, dsign,
		e, e1, esign, i, j, k, nd, nd0, nf, nz, nz0, sign;
	CONST char *s, *s0, *s1;
	double aadj, aadj1, adj, rv, rv0;
	Long L;
	ULong y, z;
	Bigint *bb, *bb1, *bd, *bd0, *bs, *delta;

#ifdef JS_THREADSAFE
	if (!initialized) InitDtoa();
#endif

JS/js/prdtoa.c  view on Meta::CPAN

		}
		if (bb2 > 0)
			bb = lshift(bb, bb2);
		if (bd5 > 0)
			bd = pow5mult(bd, bd5);
		if (bd2 > 0)
			bd = lshift(bd, bd2);
		if (bs2 > 0)
			bs = lshift(bs, bs2);
		delta = diff(bb, bd);
		dsign = delta->sign;
		delta->sign = 0;
		i = cmp(delta, bs);
		if (i < 0) {
			/* Error is less than half an ulp -- check for
			 * special case of mantissa a power of two.
			 */
			if (dsign || word1(rv) || word0(rv) & Bndry_mask)
				break;
			delta = lshift(delta,Log2P);
			if (cmp(delta, bs) > 0)
				goto drop_down;
			break;
		}
		if (i == 0) {
			/* exactly half-way between */
			if (dsign) {
				if ((word0(rv) & Bndry_mask1) == Bndry_mask1
					&&  word1(rv) == 0xffffffff) {
					/*boundary case -- increment exponent*/
					word0(rv) = (word0(rv) & Exp_mask)
						+ Exp_msk1
#ifdef IBM
						| Exp_msk1 >> 4
#endif
						;
					word1(rv) = 0;

JS/js/prdtoa.c  view on Meta::CPAN

#ifdef IBM
				goto cont;
#else
				break;
#endif
			}
#ifndef ROUND_BIASED
			if (!(word1(rv) & LSB))
				break;
#endif
			if (dsign)
				rv += ulp(rv);
#ifndef ROUND_BIASED
			else {
				rv -= ulp(rv);
#ifndef Sudden_Underflow
				if (!rv)
					goto undfl;
#endif
			}
#endif
			break;
		}
		if ((aadj = ratio(delta, bs)) <= 2.) {
			if (dsign)
				aadj = aadj1 = 1.;
			else if (word1(rv) || word0(rv) & Bndry_mask) {
#ifndef Sudden_Underflow
				if (word1(rv) == Tiny1 && !word0(rv))
					goto undfl;
#endif
				aadj = 1.;
				aadj1 = -1.;
			}
			else {

JS/js/prdtoa.c  view on Meta::CPAN

				if (aadj < 2./FLT_RADIX)
					aadj = 1./FLT_RADIX;
				else
					aadj *= 0.5;
				aadj1 = -aadj;
			}
		}
		else {
			aadj *= 0.5;
			aadj1 = dsign ? aadj : -aadj;
#ifdef Check_FLT_ROUNDS
			switch(FLT_ROUNDS) {
			case 2: /* towards +infinity */
				aadj1 -= 0.5;
				break;
			case 0: /* towards 0 */
			case 3: /* towards -infinity */
				aadj1 += 0.5;
			}
#else

JS/js/prdtoa.c  view on Meta::CPAN

#else
			/* Compute adj so that the IEEE rounding rules will
			 * correctly round rv + adj in some half-way cases.
			 * If rv * ulp(rv) is denormalized (i.e.,
			 * y <= (P-1)*Exp_msk1), we must adjust aadj to avoid
			 * trouble from bits lost to denormalization;
			 * example: 1.2e-307 .
			 */
			if (y <= (P-1)*Exp_msk1 && aadj >= 1.) {
				aadj1 = (double)(int32)(aadj + 0.5);
				if (!dsign)
					aadj1 = -aadj1;
			}
			adj = aadj1 * ulp(rv);
			rv += adj;
#endif
		}
		z = word0(rv) & Exp_mask;
		if (y == z) {
			/* Can we stop now? */
			L = (Long)aadj;
			aadj -= L;
			/* The tolerances below are conservative. */
			if (dsign || word1(rv) || word0(rv) & Bndry_mask) {
				if (aadj < .4999999 || aadj > .5000001)
					break;
			}
			else if (aadj < .4999999/FLT_RADIX)
				break;
		}
	cont:
		Bfree(bb);
		Bfree(bd);
		Bfree(bs);