The R Project SVN R

/*
 *  R : A Computer Langage for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef ARITH_H_
#define ARITH_H_

#include "Platform.h"
#ifdef Macintosh
#include <fp.h>
#else
#include <math.h>
#ifndef HAVE_FINITE
int finite(double);
#endif
#endif

extern double   R_tmp;          /* Used in NaN/Inf checks */
extern double   R_NaN;          /* IEEE NaN or -DBL_MAX */
extern double   R_PosInf;       /* IEEE Inf or DBL_MAX */
extern double   R_NegInf;       /* IEEE -Inf or -DBL_MAX */
extern int      R_NaInt;        /* NA_INTEGER etc */
extern double   R_NaReal;       /* NA_REAL */

#ifdef Win32
extern int isnan(double);
extern int finite(double);
#endif

#ifdef IEEE_754

#define MATH_CHECK(call)    (call)
#define FINITE(x)       finite(x)
#define ISNAN(x)        ((x)!=(x))
#define ISNA(x)         R_IsNA(x)

#else

#define MATH_CHECK(call)    (errno=0,R_tmp=call,(errno==0)?R_tmp:R_NaN)
#define FINITE(x)       ((x)!=NA_REAL)
#define ISNAN(x)        ((x)!=NA_REAL)
#define ISNA(x)         ((x)!=NA_REAL)
#define NAN(x)          ISNAN(x)

#endif

#endif