ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mmalie <mmalie@student.42nice.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/04 15:33:29 by mmalie            #+#    #+#             */
/*   Updated: 2024/11/14 09:27:24 by mmalie           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"
/* 
 * Implementation of atoi() from <stdlib.h>: Converts a string to an integer, 
 * stopping at the first non-numeric character.
 */
int			ft_atoi(const char *nptr);
static		int	ft_isspace(int c);

int	ft_atoi(const char *nptr)
{
	int	result;
	int	sign;

	result = 0;
	sign = 1;
	while (ft_isspace(*nptr))
	{
		nptr++;
	}
	if (*nptr == '+' || *nptr == '-')
	{
		if (*nptr == '-')
		{
			sign = -1;
		}
		nptr++;
	}
	while (ft_isdigit(*nptr))
	{
		result = (result * 10) + (*nptr - '0');
		nptr++;
	}
	return (result * sign);
}

static int	ft_isspace(int c)
{
	return (c == 32 || c == '\f' || c == '\n'
		|| c == '\r' || c == '\t' || c == '\v');
}