#include <stdlib.h>
#include <stdio.h> //for main test

static int	ft_strlen(const char *s)
{
	int i;

	i = 0;
	while (s[i])
		i++;
	return i;
}

static char	*ft_strrev(char *str)
{
	int i;
	int j;
	int tmp;

	i = 0;
	j = ft_strlen(str);
	while (j > i)
	{
		j--;
		tmp = str[i];
		str[i] = str[j];
		str[j] = tmp;
		i++;
	}
	return str;
}

char	*ft_itoa(int nbr)
{
	int i;
	int neg;
	char *tmp;

	i = 0;
	neg = 0;
	tmp = malloc(sizeof(char) * 12);
	if (tmp == NULL || nbr == 0)
		return ((nbr == 0) ? "0" : NULL);
	if (nbr == -2147483648)
		return ("-2147483648");
	if (nbr < 0)
	{
		neg = 1;
		nbr *= -1;
	}
	while (nbr)
	{
		tmp[i++] = (nbr % 10) + '0';
		nbr /= 10;
	}
	if (neg)
		tmp[i] = '-';
	return ft_strrev(tmp);
}

int	main(void)
{
	int i = 0;
	int tab[5] = {-2147483648, -42, 0, 42, 2147483647};

	while (i < 5)
		printf("%s\n", ft_itoa(tab[i++]));

	return 0;
}