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ft_atol.c
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ft_atol.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atol.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: rbetz <rbetz@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/03/31 17:27:07 by rbetz #+# #+# */
/* Updated: 2023/04/07 13:45:05 by rbetz ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
long ft_atol(char *str)
{
long vz;
unsigned long c;
vz = 1;
c = 0;
while (ft_isspace(*str))
str++;
if (*str == '-')
{
str++;
vz = -1;
}
else if (*str == '+')
str++;
if (!ft_strisdigit(str))
return (0);
while (ft_isdigit(*str))
{
c = c * 10 + *(str++) - '0';
if (c > INT64_MAX && vz == -1)
return (0);
else if (c > (INT64_MAX - 1) && vz == 1)
return (-1);
}
return ((long)(c * vz));
}