/*
*
*  This software was developed by the Thermal Modeling and Analysis
*  Project(TMAP) of the National Oceanographic and Atmospheric
*  Administration's (NOAA) Pacific Marine Environmental Lab(PMEL),
*  hereafter referred to as NOAA/PMEL/TMAP.
*
*  Access and use of this software shall impose the following
*  obligations and understandings on the user. The user is granted the
*  right, without any fee or cost, to use, copy, modify, alter, enhance
*  and distribute this software, and any derivative works thereof, and
*  its supporting documentation for any purpose whatsoever, provided
*  that this entire notice appears in all copies of the software,
*  derivative works and supporting documentation.  Further, the user
*  agrees to credit NOAA/PMEL/TMAP in any publications that result from
*  the use of this software or in any product that includes this
*  software. The names TMAP, NOAA and/or PMEL, however, may not be used
*  in any advertising or publicity to endorse or promote any products
*  or commercial entity unless specific written permission is obtained
*  from NOAA/PMEL/TMAP. The user also understands that NOAA/PMEL/TMAP
*  is not obligated to provide the user with any support, consulting,
*  training or assistance of any kind with regard to the use, operation
*  and performance of this software nor to provide the user with any
*  updates, revisions, new versions or "bug fixes".
*
*  THIS SOFTWARE IS PROVIDED BY NOAA/PMEL/TMAP "AS IS" AND ANY EXPRESS
*  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
*  ARE DISCLAIMED. IN NO EVENT SHALL NOAA/PMEL/TMAP BE LIABLE FOR ANY SPECIAL,
*  INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
*  RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
*  CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION, ARISING OUT OF OR IN
*  CONNECTION WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.  
*
*/

/* switch_nan : */
/*  check for a missing or bad value flag of NaN.  if either flag is Nan, */
/*  then make sure it's ds_missing_flag and if both are NaN, make sure to */
/*  set ds_bad_flag to bad_val4     */

/* *kob* - 2/18/99 */
/* *acm*  1/12      - Ferret 6.8 ifdef double_p for double-precision ferret, see the
 *					 definition of macro DFTYPE in ferretmacros.h.
 * *acm* V6931 12/14 Fix ticket 2223: need to use the Ferret missing-value flag
 *					 which is now passed in as an argument.
 */

#include <Python.h> /* make sure Python.h is first */
#include <math.h>
#include "fmtprotos.h"

void FORTRAN(switch_nan)(DFTYPE *bad, DFTYPE *missing, DFTYPE *bad_val)
{
  if (isnan(*bad) || isnan(*missing))
    { 
      if (isnan(*bad)) 
	{
	  *missing = *bad;
	  *bad = *bad_val;
	}
    }
}

