Libft/ft_atoi.c at master · rutgercap/Libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   ft_atoi.c                                          :+:    :+:            */
/*                                                     +:+                    */
/*   By: rcappend <rcappend@student.codam.nl>         +#+                     */
/*                                                   +#+                      */
/*   Created: 2020/10/29 15:37:54 by rcappend      #+#    #+#                 */
/*   Updated: 2021/11/03 14:23:37 by rcappend      ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	i = 0;
	res = 0;
	minus = -1;
	while (ft_isspace(str[i]))
		i++;
	if (str[i] == '-')
		minus = -1;
	if (str[i] == '-' || str[i] == '+')
		i++;
	while (ft_isdigit(str[i]))
	{
		res *= 10;
		res += str[i] - '0';
		i++;
	}
	return (res * minus);
}