itoa

char *itoa(int n, unsigned char* str, int base)
{
    int i=1, j=0, x;
    if(n<0) str[j++] = '-', n = -n;
    for(x=n;x;x/=base) j++;
    for(x=n;x;x/=base) str[j-i++] = x%base + '0' + 39*(x%base>9);
    str[j] = 0;
    return str;
}