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  1. /* wf_acos.c -- float version of w_acos.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.  * wrap_acosf(x)
  18.  */
  19.  
  20. #include "fdlibm.h"
  21. #include <errno.h>
  22.  
  23. #ifdef _HAVE_STDC
  24.         float acosf(float x)            /* wrapper acosf */
  25. #else
  26.         float acosf(x)                  /* wrapper acosf */
  27.         float x;
  28. #endif
  29. {
  30. #ifdef _IEEE_LIBM
  31.         return __ieee754_acosf(x);
  32. #else
  33.         float z;
  34.         struct exception exc;
  35.         z = __ieee754_acosf(x);
  36.         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  37.         if(fabsf(x)>(float)1.0) {
  38.             /* acosf(|x|>1) */
  39.             exc.type = DOMAIN;
  40.             exc.name = "acosf";
  41.             exc.err = 0;
  42.             exc.arg1 = exc.arg2 = (double)x;
  43.             exc.retval = nan("");
  44.             if (_LIB_VERSION == _POSIX_)
  45.                errno = EDOM;
  46.             else if (!matherr(&exc)) {
  47.                errno = EDOM;
  48.             }
  49.             if (exc.err != 0)
  50.                errno = exc.err;
  51.             return (float)exc.retval;
  52.         } else
  53.             return z;
  54. #endif
  55. }
  56.  
  57. #ifdef _DOUBLE_IS_32BITS
  58.  
  59. #ifdef __STDC__
  60.         double acos(double x)
  61. #else
  62.         double acos(x)
  63.         double x;
  64. #endif
  65. {
  66.         return (double) acosf((float) x);
  67. }
  68.  
  69. #endif /* defined(_DOUBLE_IS_32BITS) */
  70.