w_atan2.c 1.0 KB

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  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. #if defined(LIBM_SCCS) && !defined(lint)
  13. static char rcsid[] = "$NetBSD: w_atan2.c,v 1.6 1995/05/10 20:48:39 jtc Exp $";
  14. #endif
  15. /*
  16. * wrapper atan2(y,x)
  17. */
  18. #include "math.h"
  19. #include "math_private.h"
  20. #ifdef __STDC__
  21. double atan2(double y, double x) /* wrapper atan2 */
  22. #else
  23. double atan2(y,x) /* wrapper atan2 */
  24. double y,x;
  25. #endif
  26. {
  27. #ifdef _IEEE_LIBM
  28. return __ieee754_atan2(y,x);
  29. #else
  30. double z;
  31. z = __ieee754_atan2(y,x);
  32. if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
  33. if(x==0.0&&y==0.0) {
  34. return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
  35. } else
  36. return z;
  37. #endif
  38. }
  39. libm_hidden_def(atan2)