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ft_itoa.c
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ft_itoa.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_itoa.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: gpiccion <[email protected]. +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/02/02 14:06:24 by gpiccion #+# #+# */
/* Updated: 2022/02/02 14:06:24 by gpiccion ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
// Counts digits, including sign (if negative)
static int ft_count_digits(int number)
{
int digit_count;
digit_count = 1;
if (number < 0)
{
number *= -1;
digit_count++;
}
while (number / 10 >= 1)
{
number /= 10;
digit_count++;
}
return (digit_count);
}
// Allocates and returns a string representing the integer 'n'.
// Negative numbers are handled.
// Returns NULL if the allocation fails.
char *ft_itoa(int n)
{
size_t digit_count;
char *result;
if (n == -2147483648)
return (ft_strdup("-2147483648"));
digit_count = ft_count_digits(n);
result = malloc(digit_count + 1);
if (!result)
return (NULL);
if (n == 0)
result[0] = '0';
else if (n < 0)
{
result[0] = '-';
n = -n;
}
result[digit_count--] = '\0';
while (n > 0)
{
result[digit_count--] = n % 10 + '0';
n /= 10;
}
return (result);
}