5980be9b3c
This work is based in part on code from NetBSD libm, libc and kernel. The library is partly public domain and partly BSD-style licensed.
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/* w_scalbf.c -- float version of w_scalb.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include <sys/cdefs.h>
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#if defined(LIBM_SCCS) && !defined(lint)
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__RCSID("$NetBSD: w_scalbf.c,v 1.6 2002/05/26 22:02:02 wiz Exp $");
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#endif
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/*
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* wrapper scalbf(float x, float fn) is provide for
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* passing various standard test suite. One
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* should use scalbn() instead.
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*/
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#include "math.h"
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#include "math_private.h"
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#include <errno.h>
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#ifdef _SCALB_INT
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float
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scalbf(float x, int fn) /* wrapper scalbf */
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#else
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float
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scalbf(float x, float fn) /* wrapper scalbf */
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_scalbf(x,fn);
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#else
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float z;
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z = __ieee754_scalbf(x,fn);
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if(_LIB_VERSION == _IEEE_) return z;
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if(!(finitef(z)||isnanf(z))&&finitef(x)) {
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/* scalbf overflow */
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return (float)__kernel_standard((double)x,(double)fn,132);
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}
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if(z==(float)0.0&&z!=x) {
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/* scalbf underflow */
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return (float)__kernel_standard((double)x,(double)fn,133);
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}
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#ifndef _SCALB_INT
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if(!finitef(fn)) errno = ERANGE;
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#endif
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return z;
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#endif
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}
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