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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* @(#)w_atan2.c 5.1 93/09/24 */
  3. /*
  4.  * ====================================================
  5.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  6.  *
  7.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  8.  * Permission to use, copy, modify, and distribute this
  9.  * software is freely granted, provided that this notice
  10.  * is preserved.
  11.  * ====================================================
  12.  */
  13.  
  14. #if defined(LIBM_SCCS) && !defined(lint)
  15. static char rcsid[] = "$Id: w_atan2.c,v 1.4 1994/08/10 20:33:38 jtc 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.