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  1. /* wf_hypot.c -- float version of w_hypot.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.  * wrapper hypotf(x,y)
  18.  */
  19.  
  20. #include "fdlibm.h"
  21. #include <errno.h>
  22.  
  23. #ifdef __STDC__
  24.         float hypotf(float x, float y)  /* wrapper hypotf */
  25. #else
  26.         float hypotf(x,y)               /* wrapper hypotf */
  27.         float x,y;
  28. #endif
  29. {
  30. #ifdef _IEEE_LIBM
  31.         return __ieee754_hypotf(x,y);
  32. #else
  33.         float z;
  34.         struct exception exc;
  35.         z = __ieee754_hypotf(x,y);
  36.         if(_LIB_VERSION == _IEEE_) return z;
  37.         if((!finitef(z))&&finitef(x)&&finitef(y)) {
  38.             /* hypotf(finite,finite) overflow */
  39. #ifndef HUGE_VAL
  40. #define HUGE_VAL inf
  41.             double inf = 0.0;
  42.  
  43.             SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */
  44. #endif
  45.             exc.type = OVERFLOW;
  46.             exc.name = "hypotf";
  47.             exc.err = 0;
  48.             exc.arg1 = (double)x;
  49.             exc.arg2 = (double)y;
  50.             if (_LIB_VERSION == _SVID_)
  51.                exc.retval = HUGE;
  52.             else
  53.                exc.retval = HUGE_VAL;
  54.             if (_LIB_VERSION == _POSIX_)
  55.                errno = ERANGE;
  56.             else if (!matherr(&exc)) {
  57.                 errno = ERANGE;
  58.             }
  59.             if (exc.err != 0)
  60.                errno = exc.err;
  61.             return (float)exc.retval;
  62.         } else
  63.             return z;
  64. #endif
  65. }
  66.  
  67. #ifdef _DOUBLE_IS_32BITS
  68.  
  69. #ifdef __STDC__
  70.         double hypot(double x, double y)
  71. #else
  72.         double hypot(x,y)
  73.         double x,y;
  74. #endif
  75. {
  76.         return (double) hypotf((float) x, (float) y);
  77. }
  78.  
  79. #endif /* defined(_DOUBLE_IS_32BITS) */
  80.