w_sqrt.c 1022 B

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  1. /* @(#)w_sqrt.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_sqrt.c,v 1.6 1995/05/10 20:49:55 jtc Exp $";
  14. #endif
  15. /*
  16. * wrapper sqrt(x)
  17. */
  18. #include "math.h"
  19. #include "math_private.h"
  20. libm_hidden_proto(sqrt)
  21. #ifdef __STDC__
  22. double sqrt(double x) /* wrapper sqrt */
  23. #else
  24. double sqrt(x) /* wrapper sqrt */
  25. double x;
  26. #endif
  27. {
  28. #ifdef _IEEE_LIBM
  29. return __ieee754_sqrt(x);
  30. #else
  31. double z;
  32. z = __ieee754_sqrt(x);
  33. if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  34. if(x<0.0) {
  35. return __kernel_standard(x,x,26); /* sqrt(negative) */
  36. } else
  37. return z;
  38. #endif
  39. }
  40. libm_hidden_def(sqrt)