1 /* @(#)w_atan2.c 5.1 93/09/24 */ 2 /* 3 * ==================================================== 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 5 * 6 * Developed at SunPro, a Sun Microsystems, Inc. business. 7 * Permission to use, copy, modify, and distribute this 8 * software is freely granted, provided that this notice 9 * is preserved. 10 * ==================================================== 11 */ 12 13 #include <sys/cdefs.h> 14 #if defined(LIBM_SCCS) && !defined(lint) 15 __RCSID("$NetBSD: w_atan2.c,v 1.8 1999/07/02 15:37:44 simonb Exp $"); 16 #endif 17 18 /* 19 * wrapper atan2(y,x) 20 */ 21 22 #include "math.h" 23 #include "math_private.h" 24 25 26 #ifdef __STDC__ 27 double atan2(double y, double x) /* wrapper atan2 */ 28 #else 29 double atan2(y,x) /* wrapper atan2 */ 30 double y,x; 31 #endif 32 { 33 #ifdef _IEEE_LIBM 34 return __ieee754_atan2(y,x); 35 #else 36 double z; 37 z = __ieee754_atan2(y,x); 38 if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z; 39 if(x==0.0&&y==0.0) { 40 return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */ 41 } else 42 return z; 43 #endif 44 } 45