cantera/ext/math/mach.cpp

/* Standard C source for D1MACH -- remove the * in column 1 */
#include <stdlib.h>
#include <stdio.h>
#include <float.h>
#include <math.h>
#include <limits.h>

extern "C" {

    double d1mach_(long* i)
    {
        switch (*i) {
        case 1:
            return DBL_MIN;
        case 2:
            return DBL_MAX;
        case 3:
            return DBL_EPSILON/FLT_RADIX;
        case 4:
            return DBL_EPSILON;
        case 5:
            return log10((double)FLT_RADIX);
        }
        fprintf(stderr, "invalid argument: d1mach(%ld)\n", *i);
        exit(1);
        return 0; /* some compilers demand return values */
    }

    double d1mach(long* i)
    {
        return d1mach_(i);
    }


    long i1mach_(long* i)
    {
        switch (*i) {
        case 1:
            return 5;    /* standard input */
        case 2:
            return 6;    /* standard output */
        case 3:
            return 7;    /* standard punch */
        case 4:
            return 0;    /* standard error */
        case 5:
            return 32;   /* bits per integer */
        case 6:
            return sizeof(int);
        case 7:
            return 2;    /* base for integers */
        case 8:
            return 31;   /* digits of integer base */
        case 9:
            return LONG_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;
        }
        fprintf(stderr, "invalid argument: i1mach(%ld)\n", *i);
        exit(1);
        return 0; /* some compilers demand return values */
    }

    long i1mach(long* i)
    {
        return i1mach_(i);
    }

    long _i1mach_(long* i)
    {
        return i1mach_(i);
    }

}