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ft_atoi.c
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ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: anarodri <anarodri@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/09/16 13:26:51 by anarodri #+# #+# */
/* Updated: 2022/12/15 12:51:09 by anarodri ### ########.fr */
/* */
/* ************************************************************************** */
/* Converts ASCII string to integer.
The atoi function skips all white-space characters,
converts the subsequent characters as part of the number,
and then stops when it encounters the first character that isn't a number.
If no valid conversion could be performed, it returns zero.
*/
#include "../libft.h"
int ft_atoi(const char *str)
{
long nbr;
int i;
int sign;
i = 0;
sign = 1;
nbr = 0;
while ((str[i] >= '\t' && str[i] <= '\r') || str[i] == ' ')
i++;
if (str[i] == '-')
sign *= -1;
if (str[i] == '+' || str[i] == '-')
i++;
while (str[i] >= '0' && str[i] <= '9')
{
nbr = (nbr * 10) + str[i] - '0';
i++;
if (nbr * sign > INT_MAX)
return (-1);
if (nbr * sign < INT_MIN)
return (0);
}
return (nbr * sign);
}