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ft_itoa.c
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ft_itoa.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_itoa.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: averemiy <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2018/03/24 14:44:40 by averemiy #+# #+# */
/* Updated: 2018/03/28 12:55:40 by averemiy ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static int sch(int n)
{
int i;
i = 0;
if (n == 0)
return (1);
while (n > 0)
{
i++;
n = n / 10;
}
return (i);
}
static void smth(char *s, int n, int l)
{
int res;
int del;
int n1;
res = 0;
while (l > 0)
{
del = l - 1;
n1 = n;
res = n1;
while (del > 0)
{
res = n1 / 10;
n1 = n1 / 10;
del--;
}
res = res % 10;
*s = res + '0';
l--;
s++;
}
*s = '\0';
}
static char *memus(int i, int n)
{
char *res;
int size;
char *p;
if (i > 1)
{
size = sch(-1 * n);
res = ft_strnew(size + 1);
if (res == NULL)
return (NULL);
p = res;
*res = '-';
res++;
smth(res, (-1 * n), size);
}
else
{
size = sch(n);
res = ft_strnew(size);
if (res == NULL)
return (NULL);
p = res;
smth(res, n, size);
}
return (p);
}
char *ft_itoa(int n)
{
char *res;
char *p;
res = NULL;
if (n == -2147483648)
{
res = (char *)malloc(sizeof(char) * (sch(-1 * n) + 2));
if (res == NULL)
return (NULL);
p = res;
*p = '-';
p++;
*p = '2';
p++;
smth(p, 147483648, sch(147483648));
}
else if (n < 0)
res = memus(2, n);
else
res = memus(1, n);
return (res);
}