42_Philosopher/philo/utils/ft_isnum.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_isnum.c                                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/03/08 14:43:33 by cchauvet          #+#    #+#             */
/*   Updated: 2023/04/19 13:49:58 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "../philo.h"
#include <stddef.h>
#include <limits.h>

bool	ft_isnum(char str[])
{
	size_t	i;
	size_t	num;

	num = 0;
	i = 0;
	while (str[i] != '\0')
	{
		if (str[i] > '9' || str[i] < '0')
			return (0);
		num = num * 10 + str[i] - 48;
		if (num > INT_MAX)
			return (0);
		i++;
	}
	return (1);
}