ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jowagner <jowagner@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/12 13:59:49 by jowagner          #+#    #+#             */
/*   Updated: 2024/12/18 22:23:18 by jowagner         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/**
 * @brief Converts the initial portion of the string pointed to
 * by str to an integer.
 *
 * @param str The string to be converted.
 * @return The converted integer value.
 * Returns 0 if no valid conversion could be performed.
 */
int	ft_atoi(const char *str)
{
	int	i;
	int	sign;
	int	result;

	i = 0;
	sign = 1;
	result = 0;
	while ((str[i] >= 9 && str[i] <= 13) || str[i] == 32)
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			sign *= -1;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9')
	{
		result = (result * 10) + (str[i] - '0');
		i++;
	}
	return (sign * result);
}