diff --git a/parsing/sources/utils.c b/parsing/sources/utils.c
new file mode 100644
index 0000000..11d6fa3
--- /dev/null
+++ b/parsing/sources/utils.c
@@ -0,0 +1,55 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   utils.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/03/28 12:40:08 by rparodi           #+#    #+#             */
+/*   Updated: 2026/03/28 15:22:10 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "macro.h"
+#include "parsing.h"
+#include <ctype.h>
+#include <errno.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+size_t args_size()
+{
+	size_t i = 0;
+	while (_flags[i].short_option != 0 || _flags[i].long_option != NULL) {
+		i++;
+	}
+	return i;
+}
+
+static bool _is_valid_number(const char *str) {
+	if (!str)
+		return false;
+
+	for (size_t i = 0; str[i]; i++) {
+		if (!isdigit(str[i]))
+			return false;
+	}
+	return true;
+}
+
+uint64_t check_num_arguments(char *arg)
+{
+	if (!_is_valid_number(arg)) {
+		ERROR_LOG(strerror(EINVAL));
+		exit(EXIT_FAILURE);
+	}
+
+	errno = 0;
+	uint64_t value = strtoull(arg, NULL, 10);
+	if (errno != 0 || value > UINT64_MAX) {
+		ERROR_LOG(strerror(errno))
+		exit(EXIT_FAILURE);
+	}
+	return value;
+}