s_ldexp.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28


/* @(#)s_ldexp.c 1.3 95/01/18 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunSoft, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

#include "fdlibm.h"
#include <errno.h>

#ifdef __STDC__
	double ieee_ldexp(double value, int exp)
#else
	double ieee_ldexp(value, exp)
	double value; int exp;
#endif
{
	if(!ieee_finite(value)||value==0.0) return value;
	value = ieee_scalbn(value,exp);
	if(!ieee_finite(value)||value==0.0) errno = ERANGE;
	return value;
}