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ft_atoi.c
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ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: ncolomer <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/10/07 11:17:02 by ncolomer #+# #+# */
/* Updated: 2019/10/10 00:31:59 by ncolomer ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
int
ft_atoi(const char *str)
{
int i;
int is_neg;
int res;
if (!str)
return (0);
i = 0;
while (str[i] == '\t' || str[i] == '\n' || str[i] == '\v' ||
str[i] == '\f' || str[i] == '\r' || str[i] == ' ')
i++;
is_neg = (str[i] == '-') ? -1 : 1;
if (is_neg == -1 || str[i] == '+')
i++;
res = 0;
while (str[i] >= '0' && str[i] <= '9')
res = (res * 10) + (str[i++] - '0');
return (res * is_neg);
}