/* @(#)w_fmod.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

/* 
FUNCTION 
<<fmod>>, <<fmodf>>---floating-point remainder (modulo)

INDEX
fmod
INDEX
fmodf

ANSI_SYNOPSIS
#include <math.h>
double fmod(double <[x]>, double <[y]>)
float fmodf(float <[x]>, float <[y]>)

TRAD_SYNOPSIS
#include <math.h>
double fmod(<[x]>, <[y]>)
double (<[x]>, <[y]>);

float fmodf(<[x]>, <[y]>)
float (<[x]>, <[y]>);

DESCRIPTION
The <<fmod>> and <<fmodf>> functions compute the floating-point
remainder of <[x]>/<[y]> (<[x]> modulo <[y]>).

RETURNS
The <<fmod>> function returns the value 
@ifinfo
<[x]>-<[i]>*<[y]>, 
@end ifinfo
@tex
$x-i\times y$,
@end tex
for the largest integer <[i]> such that, if <[y]> is nonzero, the
result has the same sign as <[x]> and magnitude less than the
magnitude of <[y]>. 

<<fmod(<[x]>,0)>> returns NaN, and sets <<errno>> to <<EDOM>>.

You can modify error treatment for these functions using <<matherr>>.

PORTABILITY
<<fmod>> is ANSI C. <<fmodf>> is an extension.
*/

/* 
 * wrapper fmod(x,y)
 */

#include "fdlibm.h"
#include <errno.h>

#ifndef _DOUBLE_IS_32BITS

#ifdef __STDC__
double
fmod (double x, double y)	/* wrapper fmod */
#else
double
fmod (x, y)			/* wrapper fmod */
     double x, y;
#endif
{
#ifdef _IEEE_LIBM
  return __ieee754_fmod (x, y);
#else
  double z;
  struct exception exc;
  z = __ieee754_fmod (x, y);
  if (_LIB_VERSION == _IEEE_ || isnan (y) || isnan (x))
    return z;
  if (y == 0.0)
    {
      /* fmod(x,0) */
      exc.type = DOMAIN;
      exc.name = "fmod";
      exc.arg1 = x;
      exc.arg2 = y;
      exc.err = 0;
      if (_LIB_VERSION == _SVID_)
	exc.retval = x;
      else
	exc.retval = 0.0 / 0.0;
      if (_LIB_VERSION == _POSIX_)
	errno = EDOM;
      else if (!matherr (&exc))
	{
	  errno = EDOM;
	}
      if (exc.err != 0)
	errno = exc.err;
      return exc.retval;
    }
  else
    return z;
#endif
}

#endif /* defined(_DOUBLE_IS_32BITS) */