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ft_itoa.c
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ft_itoa.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_itoa.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: mkrubini <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/03/10 21:45:02 by mkrubini #+# #+# */
/* Updated: 2020/03/14 14:40:56 by mkrubini ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
#include <stdlib.h>
int checkpossize(int ncopy)
{
int size;
size = 2;
if (ncopy == 0)
return (size);
while (ncopy >= 10)
{
size++;
ncopy = ncopy / 10;
}
return (size);
}
int checknegsize(int ncopy)
{
int size;
size = 3;
while (ncopy <= -10)
{
size++;
ncopy = ncopy / 10;
}
return (size);
}
char *putnegnbr(char *nbr, int ncopy, int size)
{
int count;
count = size - 2;
nbr[0] = '-';
while (ncopy <= -10)
{
nbr[count] = ((ncopy % 10) * -1) + '0';
ncopy = ncopy / 10;
count--;
}
if (ncopy > -10)
nbr[1] = (ncopy * -1) + '0';
return (nbr);
}
char *putposnbr(char *nbr, int ncopy, int size)
{
int count;
count = size - 2;
if (ncopy == 0)
{
nbr[0] = '0';
return (nbr);
}
while (ncopy >= 10)
{
nbr[count] = (ncopy % 10) + '0';
ncopy = ncopy / 10;
count--;
}
if (ncopy < 10)
nbr[count] = ncopy + '0';
return (nbr);
}
char *ft_itoa(int n)
{
char *nbr;
int size;
int ncopy;
size = 0;
ncopy = n;
if (n < 0)
size = checknegsize(ncopy);
else
size = checkpossize(ncopy);
if (!(nbr = malloc(sizeof(char) * size)))
return (NULL);
ncopy = n;
if (n < 0)
nbr = putnegnbr(nbr, ncopy, size);
else
nbr = putposnbr(nbr, ncopy, size);
nbr[size - 1] = '\0';
return (nbr);
}