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

#include <math.h>
#ifdef Macintosh
# define finite(x) isfinite(x)
#else
# 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


#ifdef __MAIN__
#define extern
#endif
extern double   R_tmp;      /* Temporary Value 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 __MAIN__
#undef extern
#endif

#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


#ifdef IEEE_754

int R_IsNA(double);     /* True for Real NA only */
int R_IsNaN(double);        /* True for special NaN, *not* for NA */

# define MATH_CHECK(call)   (call)

#define FINITE(x)       finite(x)
#define ISNAN(x)        (isnan(x)!=0)   /* True, *both* for NA | NaN */
                /* NOTE: some systems do not return 1 for TRUE*/
#define ISNA(x)         R_IsNA(x) /* from ../main/arithmetic.c */

#else

#define MATH_CHECK(call)    (errno=0,R_tmp=call,(errno==0)?R_tmp:R_NaN)
/* /usr/include/sys/errno.h (Solaris 2.5) has
   EDOM   : Math arg out of domain of func
   ERANGE : Math result not representable
*/

#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