libft/ft_atoi.c at main · andrelucca99/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: alucas-e <alucas-e@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/15 11:39:51 by alucas-e          #+#    #+#             */
/*   Updated: 2024/10/29 10:25:21 by alucas-e         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

int	ft_atoi(const char *str)
{
	int	i;
	int	signal;

	i = 0;
	signal = 1;
	while ((*str >= '\t' && *str <= '\r') || *str == ' ')
		str++;
	if (*str == '-' || *str == '+')
	{
		if (*str == '-')
			signal *= -1;
		str++;
	}
	while (*str >= '0' && *str <= '9')
	{
		i *= 10;
		i += *str - '0';
		str++;
	}
	i *= signal;
	return (i);
}