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

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: muganiev <gf.black.tv@gmail.com>           +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/05/16 14:39:48 by muganiev          #+#    #+#             */
/*   Updated: 2022/05/31 19:31:46 by muganiev         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	is_neg = 1;
	i = 0;
	if (!str)
		return (0);
	while (str[i] == '\t' || str[i] == '\n' || str[i] == '\v' || str[i] == '\f'
		|| str[i] == '\r' || str[i] == ' ')
		i++;
	if (str[i] == '-')
	{
		is_neg = -1;
		i++;
	}
	else if (str[i] == '+')
		i++;
	res = 0;
	while (str[i] >= '0' && str[i] <= '9')
		res = (res * 10) + (str[i++] - '0');
	return (res * is_neg);
}