diff --git a/Makefile b/Makefile
index 3fcc826..bf96396 100644
--- a/Makefile
+++ b/Makefile
@@ -6,12 +6,13 @@
 #    By: apommier <apommier@student.42.fr>          +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2022/02/13 16:27:49 by apommier          #+#    #+#              #
-#    Updated: 2022/03/15 17:49:12 by apommier         ###   ########.fr        #
+#    Updated: 2022/03/19 00:16:31 by apommier         ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
 NAME	= philo
 SRCS	= srcs/main.c\
+			srcs/check_args.c\
 			srcs/init.c\
 			srcs/exit.c\
 			srcs/philo.c\
diff --git a/srcs/check_args.c b/srcs/check_args.c
new file mode 100644
index 0000000..45e6e16
--- /dev/null
+++ b/srcs/check_args.c
@@ -0,0 +1,63 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   check_args.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: apommier <apommier@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2022/03/19 00:05:55 by apommier          #+#    #+#             */
+/*   Updated: 2022/03/19 00:21:03 by apommier         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "philosophers.h"
+
+size_t	ft_strlen(const char *s)
+{
+	size_t	i;
+
+	i = 0;
+	if (!s)
+		return (0);
+	while (s[i] != 0)
+		i++;
+	return (i);
+}
+
+int	is_nbr(int nb_args, char **list)
+{
+	int	j;
+	int	i;
+
+	i = 0;
+	j = 1;
+	while (nb_args - j)
+	{
+		if (ft_strlen(list[j]) > 10)
+			return (0);
+		i = 0;
+		while (list[j][i])
+		{
+			if (list[j][i] < '0' || list[j][i] > '9')
+				return (0);
+			i++;
+		}
+		if (ft_atoi(list[j]) > 2147483647)
+			return (0);
+		j++;
+	}
+	return (1);
+}
+
+int	check_arg(int argc, char **argv)
+{
+	if (argc != 5 && argc != 6)
+		return (1);
+	if (!is_nbr(argc, argv))
+		return (1);
+	if (argv[1][0] == '0' || (argv[1][0] == '1' && !argv[1][1]))
+		return (1);
+	if (argc == 6 && argv[5][0] == '0')
+		return (1);
+	return (0);
+}
diff --git a/srcs/utils.c b/srcs/utils.c
index d0b12a5..56f9332 100644
--- a/srcs/utils.c
+++ b/srcs/utils.c
@@ -57,33 +57,6 @@ void	put_event(t_arg *data, int philo_id, char *event)
 	pthread_mutex_unlock(&data->life_check);
 }
 
-int	check_arg(int argc, char **argv)
-{
-	int	i;
-	int	j;
-
-	j = 0;
-	i = 1;
-	if (argc != 5 && argc != 6)
-		return (1);
-	while (argv[i])
-	{
-		j = 0;
-		while (argv[i][j])
-		{
-			if (argv[i][j] > '9' || argv[i][j] < '0')
-				return (1);
-			j++;
-		}
-		i++;
-	}
-	if (argv[1][0] == '0' || (argv[1][0] == '1' && !argv[1][1]))
-		return (1);
-	if (argc == 6 && argv[5][0] == '0')
-		return (1);
-	return (0);
-}
-
 int	is_philo_full(t_philo *philo, t_arg *data)
 {
 	int	nb_full;