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ft_atoi.c
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ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: eel-orch <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/10/18 18:01:48 by eel-orch #+# #+# */
/* Updated: 2019/11/05 01:36:37 by eel-orch ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
int retur(unsigned long j, int sin)
{
if (j > 2147483647 && sin == 1)
return (-1);
if (j > 2147483648 && sin == -1)
return (0);
return (j * sin);
}
int ft_atoi(const char *str)
{
int i;
int sin;
unsigned long j;
i = 0;
j = 0;
sin = 1;
while ((str[i] != '\0' && (str[i] >= 9 && str[i] <= 13)) || str[i] == 32)
i++;
if (str[i] == '-' || str[i] == '+')
{
if (str[i] == '-')
sin = -1;
i++;
}
while (str[i] != '\0' && str[i] >= '0' && str[i] <= '9')
{
j = j * 10 + (str[i] - '0');
i++;
}
return (retur(j, sin));
}