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ft_strtol.c
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ft_strtol.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strtol.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: oadhesiv <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/04/25 14:17:03 by oadhesiv #+# #+# */
/* Updated: 2020/06/01 01:19:00 by oadhesiv ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static t_byte ft_issign(char c)
{
if (c == '+' || c == '-')
return (1);
return (0);
}
/*
** base is not implemented
*/
long ft_strtol(const char *str, char **endptr, int base)
{
t_ulong ret;
char sign;
size_t i;
base = 10;
ret = 0;
sign = 1;
i = 0;
while (str[i] && ft_isspace(str[i]))
i++;
if (ft_issign(str[i]))
sign = str[i++] == '-' ? -1 : 1;
if (ft_isdigit(str[i]))
while (str[i] && ft_isdigit(str[i]))
{
if (ret > LONG_MAX / base
|| (t_byte)(str[i] - 48) > LONG_MAX - ret * base)
return (sign == -1 ? LONG_MIN : LONG_MAX);
ret = ret * base + str[i] - 48;
i++;
}
*endptr = (char*)(str + i);
return (sign * ret);
}