ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ajakob <ajakob@student.42heilbronn.de>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/11/29 14:24:15 by ajakob            #+#    #+#             */
/*   Updated: 2022/11/30 15:05:43 by ajakob           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int	res;
	int	sign;

	res = 0;
	sign = 1;
	while (*str == '\t' || *str == '\n' || *str == '\f'
		|| *str == '\v' || *str == '\r' || *str == ' ')
		str++;
	if (*str == '-')
		sign = -1;
	if (*str == '-' || *str == '+')
		str++;
	while (*str >= 48 && *str <= 57)
	{
		res = res * 10 + (*str - 48);
		str++;
	}
	return (res * sign);
}