/
ft_atoi.c
executable file
·41 lines (38 loc) · 1.53 KB
/
ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: jsalome <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/09/25 14:45:04 by jsalome #+# #+# */
/* Updated: 2019/09/29 15:02:10 by jsalome ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
int ft_atoi(const char *str)
{
static unsigned long i;
unsigned long long num;
int mod;
i = 0;
num = 0;
mod = 1;
while (*(str + i) == '\n' || *(str + i) == '\t' \
|| *(str + i) == '\r' || *(str + i) == '\v' \
|| *(str + i) == '\f' || *(str + i) == ' ')
i++;
if (*(str + i) == '-')
mod = -1;
if (*(str + i) == '-' || *(str + i) == '+')
i++;
while (*(str + i) && *(str + i) >= '0' && *(str + i) <= '9')
{
num = (unsigned long long)(num * 10 + (*(str + i++) - '0'));
if (num > (long long)MAXLLONG && mod == 1)
return (-1);
if (num > (long long)MAXLLONG && mod == -1)
return (0);
}
return ((int)(num * mod));
}