ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gnickel <gnickel@student.42heilbronn.de>   +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/11 13:21:04 by gnickel           #+#    #+#             */
/*   Updated: 2024/10/11 13:21:04 by gnickel          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	i = 0;
	sign = 1;
	res = 0;
	while (str[i] == ' ' || str[i] == '\t' || str[i] == '\n' \
		|| str[i] == '\v' || str[i] == '\f' || str[i] == '\r')
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i++] == '-')
			sign = -1;
	}
	while (ft_isdigit(str[i]))
		res = res * 10 + (str[i++] - '0');
	return (res * sign);
}