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ft_atoi.c
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ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dsoroko <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/04/13 17:22:07 by dsoroko #+# #+# */
/* Updated: 2022/04/27 18:33:29 by dsoroko ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static int atoi_limits(unsigned long long result, int sign, int size)
{
unsigned long long max;
max = 9223372036854775807U;
if (((result > max) || size > 19) && sign > 0)
return (-1);
else if (((result > (max + 1)) || size > 19) && sign < 0)
return (0);
return (result * sign);
}
int ft_atoi(const char *str)
{
unsigned long long result;
int i;
int sign;
int size;
result = 0;
i = 0;
sign = 1;
size = 0;
while (str[i] == ' ' || str[i] == '\n' || str[i] == '\r'
|| str[i] == '\t' || str[i] == '\v' || str[i] == '\f')
i++;
if (str[i] == '-' || str[i] == '+')
{
if (str[i] == '-')
sign = -1;
i++;
}
while (str[i] && str[i] >= '0' && str[i] <= '9')
{
result = result * 10 + str[i] - '0';
i++;
size ++;
}
return (atoi_limits(result, sign, size));
}
// #include <stdlib.h>
// #include <stdio.h>
// int main()
// {
// printf("%d ", ft_atoi("18446744073709551615"));
// printf("\n");
// printf("%d ", atoi("18446744073709551615"));
// printf("\n");
// printf("%d ", ft_atoi("-9223372036854775807"));
// printf("\n");
// printf("%d ", atoi("-9223372036854775807"));
// printf("\n");
// printf("%d ", ft_atoi(" ---+--+1234ab567"));
// printf("\n");
// printf("%d ", atoi(" ---+--+1234ab567"));
// printf("\n");
// printf("%d ", ft_atoi("-9223372036854775808"));
// printf("\n");
// printf("%d ", atoi("-9223372036854775808"));
// printf("\n");
// printf("%d ", ft_atoi("9223372036854775807"));
// printf("\n");
// printf("%d ", atoi("9223372036854775807"));
// printf("\n");
// printf("%d ", ft_atoi("19489384723948723948"));
// printf("\n");
// printf("%d ", atoi("19489384723948723948"));
// }