LIBFT_42/ft_atoi.c at main · Aztaban/LIBFT_42 · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mjusta <mjusta@student.42prague.com>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/05/24 15:46:04 by mjusta            #+#    #+#             */
/*   Updated: 2025/05/25 17:19:01 by mjusta           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	ft_isspace(int c)
{
	return ((c >= 9 && c <= 13) || c == 32);
}

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

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