The R Project SVN R

/*
 *  R : A Computer Language 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"

/* Maybe get  finite(.) : */
#ifdef HAVE_IEEE754_H
#include <ieee754.h> /* newer Linuxen */
#else
#ifdef HAVE_IEEEFP_H
#include <ieeefp.h> /* others [Solaris 2.5.x], .. */
#endif
#endif

#ifdef Macintosh
# include <fp.h>
#else
# include <math.h>
# ifndef HAVE_FINITE
#  ifndef finite /* Do not declare if macro! */
#   ifdef isfinite/* HPUX math.h */
#     define finite(x)   isfinite(x)
#   else
      int finite(double);
#   endif
#  endif
# 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 */

#define NA_LOGICAL  R_NaInt
#define NA_INTEGER  R_NaInt
#define NA_FACTOR   R_NaInt
#define NA_REAL     R_NaReal
#define NA_STRING   R_NaString

int R_IsNA(double);/* Missing Value Test */
int R_IsNaN(double);/* Special NaN */

#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))/* True, *both* for NA & NaN */
#define ISNA(x)         R_IsNA(x) /* --> ../main/arithmetic.c */

#else

#define MATH_CHECK(call)    (errno=0,R_tmp=call,(errno==0)?R_tmp:R_NaN)

#ifndef HAVE_FINITE
#define FINITE(x)               ((x)!= R_NaReal)
#else
#define FINITE(x)       finite(x)
#endif

#ifndef HAVE_ISNAN
#define ISNAN(x)                ((x)==R_NaReal)
#else
#define ISNAN(x)                (isnan(x) || (x)==R_NaReal)
#endif

#define ISNA(x)                 ((x)==R_NaReal)
/* never used. in HP-UX' c89 "NAN" is for a double const. :
 * #define NAN(x)           ISNAN(x)
 */
#endif

#endif