// result must be long enough for result + 1 ('\0'). Max length required is:
// strlen('18,446,744,073,709,551,615')+1 = 27
// returns pointer to result
static char* ulong_to_str(unsigned long num, char* result)
{
int digits = num_of_digits(num);
int num_commas = (digits-1) / 3;
int i;
char *p = result + digits + num_commas;
*p = '\0';
p--;
for(i = 0; i < digits; i++)
{
if(i > 0 && i % 3 == 0)
{
*p = ',';
p--;
}
*p = '0' + (num % 10);
p--;
num /= 10;
}
return result;
}
char *ft_itoa(int n)
{
char *ret;
int i;
int sign;
int len;
len = num_of_digits(n);
ret = (char *)ft_memalloc(sizeof(*ret) * (len + 1));
n = check_num(n, &sign, &ret);
if (ft_strlen(ret) != 0)
return (ret);
if (ret == NULL)
return (NULL);
i = 0;
while (n > 0)
{
ret[i] = (n % 10) + 48;
n /= 10;
i++;
}
ret = finish_ret(sign, ret, i);
return (ret);
}
