diff --git a/libftasm/includes/str.h b/libftasm/includes/str.h
index 2c95ad51..eeadb792 100644
--- a/libftasm/includes/str.h
+++ b/libftasm/includes/str.h
@@ -6,7 +6,7 @@
 /*   By: jhalford <jack@crans.org>                  +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2017/02/18 13:05:53 by jhalford          #+#    #+#             */
-/*   Updated: 2017/02/18 18:47:45 by jhalford         ###   ########.fr       */
+/*   Updated: 2017/03/02 15:14:08 by ariard           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -66,5 +66,6 @@ char	*ft_strtok(char *s, const char *delim);
 size_t	ft_strcspn(char *s, const char *delim);
 
 char	*ft_path_notdir(char *path);
+int		ft_stris(char *str, (*f)(char *str));
 
 #endif
diff --git a/libftasm/src/str/ft_stris.c b/libftasm/src/str/ft_stris.c
new file mode 100644
index 00000000..22d478e0
--- /dev/null
+++ b/libftasm/src/str/ft_stris.c
@@ -0,0 +1,21 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_stris.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: ariard <ariard@student.42.fr>              +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2017/03/02 15:11:28 by ariard            #+#    #+#             */
+/*   Updated: 2017/03/02 15:13:07 by ariard           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+int			ft_stris(char *str, (*f)(char *str))
+{
+	while (*str)
+		if (!(f)(*str++))
+			return (0);
+	return (1);
+}