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ft_atoi.c
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ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: yrhiba <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/10/07 16:51:50 by yrhiba #+# #+# */
/* Updated: 2023/01/11 11:05:50 by yrhiba ### ########.fr */
/* */
/* ************************************************************************** */
static unsigned long long ft_rtn(unsigned long long nbr, int isneg,
unsigned long long maxll)
{
if (nbr > (maxll + 1) && isneg)
return (0);
else if (nbr > maxll && !isneg)
return (-1);
if (isneg)
return (-nbr);
return (nbr);
}
int ft_atoi(const char *str)
{
long i;
unsigned long long nbr;
int isneg;
unsigned long long maxll;
maxll = 9223372036854775806;
i = 0;
nbr = 0;
isneg = 0;
while (str[i] != '\0' && (str[i] == 32 || str[i] == '\t' || str[i] == '\n'
|| str[i] == '\r' || str[i] == '\v' || str[i] == '\f'))
i++;
if (str[i] == '+' || str[i] == '-')
{
if (str[i] == '-')
isneg = 1;
i++;
}
while (str[i] <= '9' && str[i] >= '0')
nbr = (nbr * 10) + (str[i++] - '0');
nbr = ft_rtn(nbr, isneg, maxll);
return (nbr);
}