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ft_itoa.c
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ft_itoa.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_itoa.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: marcrodr < marcrodr@student.42sp.org.br +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/06/09 22:01:58 by user42 #+# #+# */
/* Updated: 2022/02/14 10:02:49 by marcrodr ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static size_t get_width(int n)
{
size_t width;
width = (n <= 0);
while (n)
{
n /= 10;
width++;
}
return (width);
}
static char *strrev(char *str)
{
size_t i;
size_t len;
char tmp;
if (!str || !*str)
return (str);
len = ft_strlen(str);
i = 0;
while (i < len / 2)
{
tmp = str[i];
str[i] = str[len - 1 - i];
str[len - 1 - i] = tmp;
i++;
}
return (str);
}
char *ft_itoa(int n)
{
char *num;
int rem;
size_t i;
const char neg = (n < 0);
const size_t width = get_width(n);
if (n == INT_MIN)
return (ft_strdup("-2147483648"));
num = ft_calloc(width + 1, sizeof(char));
if (!num)
return (NULL);
if (neg)
n = -n;
i = 0;
while (i < width)
{
rem = n % 10;
n = n / 10;
num[i] = "0123456789"[rem];
i++;
}
if (neg)
num[i - 1] = '-';
return (strrev(num));
}