42_minishell/utils/ft_atoi_check.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi_check.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: erey-bet <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/07/21 08:21:05 by erey-bet          #+#    #+#             */
/*   Updated: 2023/04/04 13:40:43 by erey-bet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "utils.h"

static int	ft_isspace(char c)
{
	if (c == ' ' || c == '\f'
		||c == '\n' || c == '\r' || c == '\t' || c == '\v')
		return (1);
	return (0);
}

int	ft_atoi_check(const char *nptr)
{
	int64_t	result;
	int		sign;

	while (ft_isspace(*nptr))
		nptr++;
	sign = 1;
	if (*nptr == '+' || *nptr == '-')
	{
		if (*nptr == '-')
			sign = -1;
		nptr++;
	}
	result = 0;
	while (*nptr >= '0' && *nptr <= '9')
	{
		result = result * 10 + (*nptr++ - '0') * sign;
		if ((result < 0 && sign == 1)
			|| (result > 0 && sign == -1))
			return (2);
	}
	if (*nptr--)
		return (1);
	if (*nptr == '-' || *nptr == '+')
		return (1);
	return (0);
}