glibc/math/s_ldexpf.c

/* s_ldexpf.c -- float version of s_ldexp.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: s_ldexpf.c,v 1.3 1995/05/10 20:47:42 jtc Exp $";
#endif

#include <math.h>
#include <math_private.h>
#include <errno.h>

float __ldexpf(float value, int exp)
{
	if(!isfinite(value)||value==(float)0.0) return value + value;
	value = __scalbnf(value,exp);
	if(!isfinite(value)||value==(float)0.0) __set_errno (ERANGE);
	return value;
}
weak_alias (__ldexpf, ldexpf)
weak_alias (__ldexpf, scalbnf)