isoc99.cpp

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#define _ISOC99_SOURCE
#include <cmath>
#include <cstdlib>
#include "isoc99.h"
/* trying to safely determine if a pointer is a pointer to a double where the
double value would be in a specific range without causing floating exceptions
Of course this founders in general on the dereferencing of invalid memory
so it can only be used when pd is valid over sizeof(double).
*/
 
 
extern "C" int nrn_isdouble(double* pd, double min, double max) {
    int i;
    if (!pd) {
        return 0;
    }
#if defined(fpclassify)
    i = fpclassify(*((double*) pd));
    if (i == FP_NORMAL || i == FP_ZERO) {
        return *((double*) pd) >= min && *((double*) pd) <= max;
    } else {
        return 0;
    }
#else
    return *((double*) pd) >= min && *((double*) pd) <= max;
#endif
}
//