libft/ft_atoi.c at master · Failton/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: pruthann <[email protected]>      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/11/14 16:32:57 by pruthann          #+#    #+#             */
/*   Updated: 2020/11/14 17:06:14 by pruthann         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	num = 0;
	minus = 2;
	i = 0;
	while ((str[i] > 8 && str[i] < 14) || str[i] == 32)
		i++;
	if (str[i] == 45)
		minus = 1;
	if (str[i] == 43)
		minus = 0;
	if (minus == 0 || minus == 1)
		i++;
	while (str[i] > 47 && str[i] < 58)
	{
		num = num * 10 + str[i] - '0';
		i++;
	}
	if (minus == 1)
		num *= -1;
	return (num);
}