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ft_itoa.c
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ft_itoa.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_itoa.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dley <dley@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/05/10 17:03:11 by dley #+# #+# */
/* Updated: 2023/05/25 13:06:58 by dley ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static char *ft_special_case(int n)
{
if (n == 0)
return (ft_strdup("0"));
if (n == -2147483648)
return (ft_strdup("-2147483648"));
return (NULL);
}
static unsigned int ft_count(int n)
{
int count;
count = 1;
if (n < 0)
{
n = -n;
count++;
}
while ((n / 10) > 0)
{
n = n / 10;
count++;
}
return (count);
}
char *ft_itoa(int n)
{
int count;
char *str;
if (n == 0 || n == -2147483648)
return (ft_special_case(n));
count = ft_count(n);
str = malloc((count + 1) * sizeof(char));
if (str == NULL)
return (NULL);
if (n < 0)
{
str[0] = '-';
n = -n;
}
str[count] = '\0';
if (n < 0)
count--;
count -= 1;
while (n != 0)
{
str[count] = (n % 10) + '0';
n = n / 10;
count--;
}
return (str);
}