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ft_atoi.c
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ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: jaehejun <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/03/28 22:42:02 by jaehejun #+# #+# */
/* Updated: 2023/04/08 15:33:01 by jaehejun ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static int is_space(char c)
{
if ((9 <= c && c <= 13) || c == 32)
return (1);
return (0);
}
int ft_atoi(const char *str)
{
int sign;
long number;
sign = 1;
number = 0;
while (is_space(*str) == 1)
str++;
if (*str == '-' || *str == '+')
{
if (*str == '-')
sign *= -1;
str++;
}
while ('0' <= *str && *str <= '9')
{
number = number * 10 + (*str - '0');
str++;
}
return (number * sign);
}