Libft/ft_atoi.c at main · mobouifr/Libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mobouifr <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/11/07 01:50:31 by mobouifr          #+#    #+#             */
/*   Updated: 2023/12/16 12:02:30 by mobouifr         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int				i;
	unsigned int	v;
	int				s;

	i = 0;
	v = 0;
	s = 1;
	while ((str[i] >= 9 && str[i] <= 13) || str[i] == 32)
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			s = -1;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9')
	{
		v = v * 10 + (str[i] - 48);
		i++;
	}
	return (v * s);
}
/*
#include <stdio.h>
#include <stdlib.h>

int	main(void)
{
	// printf("ULLONG_MAX: %lu\n", sizeof(size_t));
    // return 0;
	printf("%d\n", ft_atoi("-2147483648"));
	// return (0);
}*/