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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef ARITH_H_
#define ARITH_H_

#include "Rconfig.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    /* -----  Assuming have 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)

# ifndef FINITE_BROKEN
#  define R_FINITE(x)       finite(x)
# else
#  ifdef _AIX
#   include <fp.h>
    static int R_FINITE(double x) {
        return FINITE(x);   /* NOTE: macro does not work.  */
    }
#  else
static int R_FINITE(double x) {
    return !isnan(x) & (x != R_PosInf) & (x != R_NegInf);}
#  endif
# endif

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

#else    /* ---------------- NOT IEEE 754 ---------------- */

# 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 R_FINITE(x)       ((x) != R_NaReal)
# else
#  define R_FINITE(x)       finite(x)
# endif

# ifndef HAVE_ISNAN
#  define ISNAN(x)      ((x) == R_NaReal)
# else
#  define ISNAN(x)      (isnan(x) != 0 || (x) == R_NaReal)
# endif

# define ISNA(x)        ((x) == R_NaReal)

# endif    /* ---------------- End of  IEEE 754 or not ---------------- */

#endif