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 #ifndef lint 14 static char rcsid[] = "$Id: w_atan2.c,v 1.3 1994/02/18 02:27:14 jtc Exp $"; 15 #endif 16 17 /* 18 * wrapper atan2(y,x) 19 */ 20 21 #include <math.h> 22 23 24 #ifdef __STDC__ 25 double atan2(double y, double x) /* wrapper atan2 */ 26 #else 27 double atan2(y,x) /* wrapper atan2 */ 28 double y,x; 29 #endif 30 { 31 #ifdef _IEEE_LIBM 32 return __ieee754_atan2(y,x); 33 #else 34 double z; 35 z = __ieee754_atan2(y,x); 36 if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z; 37 if(x==0.0&&y==0.0) { 38 return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */ 39 } else 40 return z; 41 #endif 42 } 43