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ft_itoa.c
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ft_itoa.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_itoa.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: alsantia <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/02/19 21:15:08 by alsantia #+# #+# */
/* Updated: 2021/02/19 21:51:33 by alsantia ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static size_t count_char(long x)
{
size_t count;
count = 0;
if (x <= 0)
{
count++;
x = -x;
}
while (x > 0)
{
x /= 10;
count++;
}
return (count);
}
static char *reverse(char *s, size_t len)
{
char tmp;
size_t i;
size_t j;
size_t count;
count = len / 2;
i = 0;
j = len - 1;
while (count--)
{
tmp = s[i];
s[i++] = s[j];
s[j--] = tmp;
}
return (s);
}
static char ft_isneg(long n, char *neg)
{
if (n < 0)
{
*neg = 1;
return (1);
}
else
return (0);
}
char *ft_itoa(int n)
{
long nb;
char *res;
char *begin;
size_t len;
char neg;
neg = 0;
nb = (long)n;
len = count_char(nb);
if (ft_isneg(nb, &neg))
nb = -nb;
if (!(res = (char *)malloc(len + 1)))
return (NULL);
begin = res;
while (len-- && nb > 0)
{
*res++ = nb % 10 + '0';
nb /= 10;
}
if (neg)
*res++ = '-';
if (n == 0)
*res++ = '0';
*res = '\0';
return (reverse(begin, ft_strlen(begin)));
}