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ft_itoa.c
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ft_itoa.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_itoa.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: doriani <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/03/29 14:36:30 by doriani #+# #+# */
/* Updated: 2023/04/04 19:16:15 by doriani ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
#include <stdlib.h>
static void ft_swap(char *a, char *b)
{
char tmp;
tmp = *a;
*a = *b;
*b = tmp;
}
static char *ft_strrev(char *str)
{
char *start;
char *end;
start = str;
end = str;
while (*(end + 1))
end++;
while (end > start)
ft_swap(start++, end--);
return (str);
}
static int get_buffer_size(int n)
{
int size;
size = 1;
if (n == 0)
return (2);
if (n < 0)
size++;
while (n != 0)
{
n /= 10;
size++;
}
return (size);
}
char *ft_itoa(int n)
{
char *str;
int i;
int sign;
i = 0;
sign = 1;
if (n == -2147483648)
return (ft_strdup("-2147483648"));
if (n < 0)
sign = -1;
str = malloc(sizeof(char) * get_buffer_size(n));
if (!str)
return (NULL);
while (n / 10 != 0)
{
str[i++] = (sign * n) % 10 + '0';
n /= 10;
}
str[i++] = (sign * n) % 10 + '0';
if (sign == -1 && i != 0)
str[i++] = '-';
str[i] = '\0';
return (ft_strrev(str));
}