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ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: jalfonso <jalfonso@student.42abudhabi.ae> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/07/15 18:30:52 by jalfonso #+# #+# */
/* Updated: 2022/08/23 16:05:45 by jalfonso ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static int num_long(unsigned long num, int sign)
{
if (num >= LLONG_MAX && sign == 1)
return (-1);
else if (num >= 9223372036854775808UL && sign == -1)
return (0);
else
return (42);
}
int ft_atoi(const char *nptr)
{
int sign;
size_t i;
size_t result;
i = 0;
result = 0;
sign = 1;
while (nptr[i] == 32 || (nptr[i] >= 9 && nptr[i] <= 13))
i++;
if (nptr[i] == '-' || nptr[i] == '+')
{
if (nptr[i] == '-')
sign *= -1;
i++;
}
while (nptr[i] >= '0' && nptr[i] <= '9')
{
result = result * 10 + (nptr[i] - '0');
i++;
if (num_long (result, sign) == 0)
return (0);
else if (num_long (result, sign) == -1)
return (-1);
}
return ((int)(result * sign));
}
// #include <stdio.h>
// #include <string.h>
//
// int main(void)
// {
// printf("ft_atoi: %d\n", ft_atoi("-2147483648"));
// printf("atoi: %d\n\n", atoi("-2147483648"));
//
// printf("ft_atoi: %d\n", ft_atoi("0"));
// printf("atoi: %d\n\n", atoi("0"));
//
// printf("ft_atoi: %d\n", ft_atoi("0000147483647"));
// printf("atoi: %d\n\n", atoi("0000147483647"));
//
// printf("ft_atoi: %d\n", ft_atoi("-9223372036854775808"));
// printf("atoi: %d\n\n", atoi("-9223372036854775808"));
//
// printf("ft_atoi: %d\n", ft_atoi("9223372036854775807"));
// printf("atoi: %d\n\n", atoi("9223372036854775807"));
//
// printf("ft_atoi: %d\n", ft_atoi("A"));
// printf("atoi: %d\n\n", atoi("A"));
//
// printf("ft_atoi: %d\n", ft_atoi("6560000000000000000000000000"));
// printf("atoi: %d\n\n", atoi("6560000000000000000000000000"));
//
// printf("ft_atoi: %d\n", ft_atoi("-6560000000000000000000000000"));
// printf("atoi: %d\n\n", atoi("-6560000000000000000000000000"));
//
// return (0);
// }