ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ccline <ccline@student.42.fr>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/09/30 23:53:02 by ccline            #+#    #+#             */
/*   Updated: 2019/10/07 07:56:29 by ccline           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int		ft_atoi(const char *str)
{
	int res;
	int neg;
	int lli;

	res = 0;
	neg = 1;
	lli = 0;
	while (*str == '\n' || *str == '\t' || *str == '\v' ||
			*str == '\f' || *str == '\r' || *str == ' ')
		str++;
	if (*str == '-' || *str == '+')
	{
		if (*str == '-')
			neg = -1;
		str++;
	}
	while (ft_isdigit(*str))
	{
		res = (res * 10) + (*str++ - '0');
		lli++;
		if (lli >= 19)
			return ((neg == -1) ? 0 : (-1));
	}
	return (res * neg);
}