#include "samd51j18a.h"
#include "string.h"
#include "usb_util.h"

char digit(int d, int radix)
{
    if (d < 10)
    {
        return d + '0';
    }
    else
    {
        return d - 10 + 'A';
    }
}

int UTIL_ltoa_radix(int64_t value, char *dest, int radix)
{
    int64_t original = value;       //save original value
    char buf[25] = "";
    int c = sizeof(buf)-1;
    int last = c;
    int d;
    int size;

    if (value < 0)                  //if it's negative, take the absolute value
        value = -value;

    do                              //write least significant digit of value that's left
    {
        d = (value % radix);
        buf[--c] = digit(d, radix);
        value /= radix;
    } while (value);

    if (original < 0)
        buf[--c] = '-';

    size = last - c + 1;            //includes null at end
    memcpy(dest, &buf[c], last - c + 1);

    return (size - 1);              //without null termination
}

int UTIL_ltoa(int64_t value, char *dest)
{
    return UTIL_ltoa_radix(value, dest, 10);
}

int UTIL_itoa(int value, char *dest)
{
    return UTIL_ltoa_radix((int64_t)value, dest, 10);
}

int UTIL_utoa(uint32_t value, char *dest)
{
    return UTIL_ltoa_radix((int64_t)value, dest, 10);
}