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/* @(#)w_sqrt.c 5.1 93/09/24 */
/*
* ====================================================
* 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.
* ====================================================
*/
/*
FUNCTION
<<sqrt>>, <<sqrtf>>---positive square root
INDEX
sqrt
INDEX
sqrtf
SYNOPSIS
#include <math.h>
double sqrt(double <[x]>);
float sqrtf(float <[x]>);
DESCRIPTION
<<sqrt>> computes the positive square root of the argument.
RETURNS
On success, the square root is returned. If <[x]> is real and
positive, then the result is positive. If <[x]> is real and
negative, the global value <<errno>> is set to <<EDOM>> (domain error).
PORTABILITY
<<sqrt>> is ANSI C. <<sqrtf>> is an extension.
*/
/*
* wrapper sqrt(x)
*/
#include "fdlibm.h"
#include <errno.h>
#if !defined(_IEEE_LIBM) || !defined(HAVE_ALIAS_ATTRIBUTE)
#ifndef _DOUBLE_IS_32BITS
#ifdef __STDC__
double sqrt(double x) /* wrapper sqrt */
#else
double sqrt(x) /* wrapper sqrt */
double x;
#endif
{
double z;
z = __ieee754_sqrt(x);
if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
if(x<0.0)
errno = EDOM;
return z;
}
#endif /* defined(_DOUBLE_IS_32BITS) */
#endif /* defined(_IEEE_LIBM) */
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