base c lib without external lib

ft_strnstr.c

@@ -0,0 +1,31 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   strnstr.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 18:05:52 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 19:07:15 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_strnstr(const char *big, const char *little, size_t len)
+{
+	size_t	little_len;
+	size_t	i;
+
+	i = 0;
+	little_len = ft_strlen(little);
+	if (!little[0])
+		return ((char *) big);
+	while ((len - i) < little_len)
+	{
+		if (!ft_strncmp(&big[i], little, little_len))
+			return ((char *) &big[i]);
+		i++;
+	}
+	return (NULL);
+}