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  1. /* wf_acosh.c -- float version of w_acosh.c.
  2.  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
  3.  */
  4.  
  5. /*
  6.  * ====================================================
  7.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  8.  *
  9.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10.  * Permission to use, copy, modify, and distribute this
  11.  * software is freely granted, provided that this notice
  12.  * is preserved.
  13.  * ====================================================
  14.  *
  15.  */
  16.  
  17. /*
  18.  * wrapper acoshf(x)
  19.  */
  20.  
  21. #include "fdlibm.h"
  22. #include <errno.h>
  23.  
  24. #ifdef __STDC__
  25.         float acoshf(float x)           /* wrapper acoshf */
  26. #else
  27.         float acoshf(x)                 /* wrapper acoshf */
  28.         float x;
  29. #endif
  30. {
  31. #ifdef _IEEE_LIBM
  32.         return __ieee754_acoshf(x);
  33. #else
  34.         float z;
  35.         struct exception exc;
  36.         z = __ieee754_acoshf(x);
  37.         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  38.         if(x<(float)1.0) {
  39.             /* acoshf(x<1) */
  40.             exc.type = DOMAIN;
  41.             exc.name = "acoshf";
  42.             exc.err = 0;
  43.             exc.arg1 = exc.arg2 = (double)x;
  44.             exc.retval = 0.0/0.0;
  45.             if (_LIB_VERSION == _POSIX_)
  46.                errno = EDOM;
  47.             else if (!matherr(&exc)) {
  48.                errno = EDOM;
  49.             }
  50.             if (exc.err != 0)
  51.                errno = exc.err;
  52.             return (float)exc.retval;
  53.         } else
  54.             return z;
  55. #endif
  56. }
  57.  
  58. #ifdef _DOUBLE_IS_32BITS
  59.  
  60. #ifdef __STDC__
  61.         double acosh(double x)
  62. #else
  63.         double acosh(x)
  64.         double x;
  65. #endif
  66. {
  67.         return (double) acoshf((float) x);
  68. }
  69.  
  70. #endif /* defined(_DOUBLE_IS_32BITS) */
  71.