NetBSD/lib/libm/src/w_scalbf.c

67 lines
1.6 KiB
C

/* w_scalbf.c -- float version of w_scalb.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.
* ====================================================
*/
#include <sys/cdefs.h>
#if defined(LIBM_SCCS) && !defined(lint)
__RCSID("$NetBSD: w_scalbf.c,v 1.5 1999/07/02 15:37:45 simonb Exp $");
#endif
/*
* wrapper scalbf(float x, float fn) is provide for
* passing various standard test suite. One
* should use scalbn() instead.
*/
#include "math.h"
#include "math_private.h"
#include <errno.h>
#ifdef __STDC__
#ifdef _SCALB_INT
float scalbf(float x, int fn) /* wrapper scalbf */
#else
float scalbf(float x, float fn) /* wrapper scalbf */
#endif
#else
float scalbf(x,fn) /* wrapper scalbf */
#ifdef _SCALB_INT
float x; int fn;
#else
float x,fn;
#endif
#endif
{
#ifdef _IEEE_LIBM
return __ieee754_scalbf(x,fn);
#else
float z;
z = __ieee754_scalbf(x,fn);
if(_LIB_VERSION == _IEEE_) return z;
if(!(finitef(z)||isnanf(z))&&finitef(x)) {
/* scalbf overflow */
return (float)__kernel_standard((double)x,(double)fn,132);
}
if(z==(float)0.0&&z!=x) {
/* scalbf underflow */
return (float)__kernel_standard((double)x,(double)fn,133);
}
#ifndef _SCALB_INT
if(!finitef(fn)) errno = ERANGE;
#endif
return z;
#endif
}