xref: /illumos-gate/usr/src/cmd/bc/lib.b.data (revision 7c478bd95313f5f23a4c958a745db2134aa03244)

/*	Copyright (c) 1984 AT&T	*/
/*	  All Rights Reserved  	*/


/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*	#ident	"%Z%%M%	%I%	%E% SMI"		*/

scale = 20
define e(x){
	auto a, b, c, d, e, g, w, y, t, r
	r = ibase
	ibase = A

	t = scale
	scale = t + .434*x + 1

	w = 0
	if(x<0){
		x = -x
		w = 1
	}
	y = 0
	while(x>2){
		x = x/2
		y = y + 1
	}

	a=1
	b=1
	c=b
	d=1
	e=1
	for(a=1;1==1;a++){
		b=b*x
		c=c*a+b
		d=d*a
		g = c/d
		if(g == e){
			g = g/1
			while(y--){
				g = g*g
			}
			scale = t
			if(w==1){
				ibase = r
				return(1/g)
			}
			ibase = r
			return(g/1)
		}
		e=g
	}
}

define l(x){
	auto a, b, c, d, e, f, g, u, s, t, r, z
	r = ibase
	ibase = A
	if(x <=0){
		z = 1-10^scale
		ibase = r
		return(z)
	}
	t = scale

	f=1
	scale = scale + scale(x) - length(x) + 1
	s=scale
	while(x > 2){
		s = s + (length(x)-scale(x))/2 + 1
		if(s>0) scale = s
		x = sqrt(x)
		f=f*2
	}
	while(x < .5){
		s = s + (length(x)-scale(x))/2 + 1
		if(s>0) scale = s
		x = sqrt(x)
		f=f*2
	}

	scale = t + length(f) - scale(f) + 1
	u = (x-1)/(x+1)

	scale = scale + 1.1*length(t) - 1.1*scale(t)
	s = u*u
	b = 2*f
	c = b
	d = 1
	e = 1
	for(a=3;1==1;a=a+2){
		b=b*s
		c=c*a+d*b
		d=d*a
		g=c/d
		if(g==e){
			scale = t
			ibase = r
			return(u*c/d)
		}
		e=g
	}
}

define s(x){
	auto a, b, c, s, t, y, p, n, i, r
	r = ibase
	ibase = A
	t = scale
	y = x/.7853
	s = t + length(y) - scale(y)
	if(s<t) s=t
	scale = s
	p = a(1)

	scale = 0
	if(x>=0) n = (x/(2*p)+1)/2
	if(x<0) n = (x/(2*p)-1)/2
	x = x - 4*n*p
	if(n%2!=0) x = -x

	scale = t + length(1.2*t) - scale(1.2*t)
	y = -x*x
	a = x
	b = 1
	s = x
	for(i=3; 1==1; i=i+2){
		a = a*y
		b = b*i*(i-1)
		c = a/b
		if(c==0){scale=t; ibase = r; return(s/1)}
		s = s+c
	}
}

define c(x){
	auto t, r
	r = ibase
	ibase = A
	t = scale
	scale = scale+1
	x = s(x+2*a(1))
	scale = t
	ibase = r
	return(x/1)
}

define a(x){
	auto a, b, c, d, e, f, g, s, t, r, z
	if(x==0) {return(0/1)}
	r = ibase
	ibase = A
	if(x==1){
		z =.7853981633974483096156608458198757210492923498437764/1
		ibase = r
		if(scale<52)return(z)
	}
	t = scale
	f=1
	while(x > .5){
		scale = scale + 1
		x= -(1-sqrt(1.+x*x))/x
		f=f*2
	}
	while(x < -.5){
		scale = scale + 1
		x = -(1-sqrt(1.+x*x))/x
		f=f*2
	}
	s = -x*x
	b = f
	c = f
	d = 1
	e = 1
	for(a=3;1==1;a=a+2){
		b=b*s
		c=c*a+d*b
		d=d*a
		g=c/d
		if(g==e){
			scale = t
			ibase = r
			return(x*c/d)
		}
		e=g
	}
}

define j(n,x){
auto a,b,c,d,e,g,i,s,k,t, r
	r = ibase
	ibase = A

	t = scale
	k = 1.36*x + 1.16*t - n
	k = length(k) - scale(k)
	if(k>0) scale = scale + k

s= -x*x/4
if(n<0){
	n= -n
	x= -x
	}
a=1
c=1
for(i=1;i<=n;i++){
	a=a*x
	c = c*2*i
	}
b=a
d=1
e=1
for(i=1;1;i++){
	a=a*s
	b=b*i*(n+i) + a
	c=c*i*(n+i)
	g=b/c
	if(g==e){
		scale = t
		ibase = r
		return(g/1)
		}
	e=g
	}
}