helper.c


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#include <math.h>
#include "header.h"

double map_range(double x, double src_lo, double src_hi, double dest_lo, double dest_hi)
{
    double src_len = fabs(src_hi - src_lo);
    double dest_len = fabs(dest_hi - dest_lo);

    return (x - src_lo) / src_len * dest_len + dest_lo;
}

int *inclusive_range(int start, int end)
{
    if (end < start)
        return NULL;
    int *range = malloc(sizeof(int) * (end - start + 1));
    if (range == NULL)
        return NULL;
    for (int i = 0; start < end; i++)
        range[i] = start++;
    return range;
}