95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
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/* @(#)w_scalb.c 5.1 93/09/24 */
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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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/*
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* wrapper scalb(double x, double 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 "fdlibm.h"
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#include <errno.h>
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#ifndef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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#ifdef _SCALB_INT
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double scalb(double x, int fn) /* wrapper scalb */
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#else
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double scalb(double x, double fn) /* wrapper scalb */
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#endif
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#else
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double scalb(x,fn) /* wrapper scalb */
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#ifdef _SCALB_INT
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double x; int fn;
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#else
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double x,fn;
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#endif
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_scalb(x,fn);
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#else
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double z;
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#ifndef HUGE_VAL
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#define HUGE_VAL inf
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double inf = 0.0;
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SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */
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#endif
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struct exception exc;
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z = __ieee754_scalb(x,fn);
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if(_LIB_VERSION == _IEEE_) return z;
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if(!(finite(z)||isnan(z))&&finite(x)) {
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/* scalb overflow; SVID also returns +-HUGE_VAL */
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exc.type = OVERFLOW;
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exc.name = "scalb";
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exc.err = 0;
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exc.arg1 = x;
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exc.arg2 = fn;
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exc.retval = x > 0.0 ? HUGE_VAL : -HUGE_VAL;
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if (_LIB_VERSION == _POSIX_)
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errno = ERANGE;
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else if (!matherr(&exc)) {
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errno = ERANGE;
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}
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if (exc.err != 0)
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errno = exc.err;
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return exc.retval;
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}
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if(z==0.0&&z!=x) {
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/* scalb underflow */
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exc.type = UNDERFLOW;
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exc.name = "scalb";
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exc.err = 0;
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exc.arg1 = x;
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exc.arg2 = fn;
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exc.retval = copysign(0.0,x);
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if (_LIB_VERSION == _POSIX_)
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errno = ERANGE;
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else if (!matherr(&exc)) {
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errno = ERANGE;
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}
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if (exc.err != 0)
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errno = exc.err;
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return exc.retval;
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}
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#ifndef _SCALB_INT
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if(!finite(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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#endif /* defined(_DOUBLE_IS_32BITS) */
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