src/nmath/i1mach.c

/*
 *  Mathlib - A Mathematical Function Library
 *  Copyright (C) 1998  Ross Ihaka
 *  Copyright (C) 2000-7 The R Core Team
 *
 *  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, a copy is available at
 *  https://www.R-project.org/Licenses/
 */

#include "nmath.h"
#include <limits.h>

attribute_hidden int Rf_i1mach(int i)
{
    switch(i) {

    case  1: return 5;
    case  2: return 6;
    case  3: return 0;
    case  4: return 0;

    case  5: return CHAR_BIT * sizeof(int);
    case  6: return sizeof(int)/sizeof(char);

    case  7: return 2;
    case  8: return CHAR_BIT * sizeof(int) - 1;
    case  9: return INT_MAX;

    case 10: return FLT_RADIX;

    case 11: return FLT_MANT_DIG;
    case 12: return FLT_MIN_EXP;
    case 13: return FLT_MAX_EXP;

    case 14: return DBL_MANT_DIG;
    case 15: return DBL_MIN_EXP;
    case 16: return DBL_MAX_EXP;

    default: return 0;
    }
}

int F77_NAME(i1mach)(int *i)
{
    return Rf_i1mach(*i);
}