ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: sudaniel <sudaniel@student.42heilbronn.de  +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/10 13:15:26 by sudaniel          #+#    #+#             */
/*   Updated: 2024/10/10 14:29:05 by sudaniel         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int	sign;
	int	num;

	num = 0;
	sign = 1;
	while ((*str >= 9 && *str <= 13) || *str == 32)
		str++;
	if (*str == '-' || *str == '+')
	{
		if (*str == '-')
			sign = -1;
		str++;
	}
	while (*str >= '0' && *str <= '9')
	{
		num *= 10;
		num += (*str - '0');
		str++;
	}
	return (sign * num);
}
/*
int main(void)
{
	char *s = " \t\n1234";
	int n = ft_atoi(s);
	int m = atoi(s);
	printf("%d\n%d\n", n, m);
	return (0);
}
*/