45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
/* @(#)w_atan2.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.
|
|
* ====================================================
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: w_atan2.c,v 1.10 2007/08/10 21:20:36 drochner Exp $");
|
|
#endif
|
|
|
|
/*
|
|
* wrapper atan2(y,x)
|
|
*/
|
|
|
|
#include "namespace.h"
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(atan2, _atan2)
|
|
#endif
|
|
|
|
double
|
|
atan2(double y, double x) /* wrapper atan2 */
|
|
{
|
|
#ifdef _IEEE_LIBM
|
|
return __ieee754_atan2(y,x);
|
|
#else
|
|
double z;
|
|
z = __ieee754_atan2(y,x);
|
|
if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
|
|
if(x==0.0&&y==0.0) {
|
|
return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
|
|
} else
|
|
return z;
|
|
#endif
|
|
}
|