Add libft

1 files changed, 47 insertions, 0 deletions

diff --git a/lib/libft/ft_strnstr.c b/lib/libft/ft_strnstr.c
new file mode 100644
index 0000000..373e90c
--- /dev/null
+++ b/lib/libft/ft_strnstr.c
@@ -0,0 +1,47 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strnstr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/06 16:07:54 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/11 15:04:28 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
+{
+	size_t	i;
+	size_t	k;
+
+	if (!*haystack && *needle)
+		return (0);
+	i = 0;
+	if (*needle == '\0' || needle == haystack)
+		return ((char *)haystack);
+	while (i < len && haystack[i])
+	{
+		k = 0;
+		while (haystack[i + k] && haystack[i + k] == needle[k] && i + k < len)
+			k++;
+		if (!needle[k])
+			return ((char *)haystack + i);
+		i++;
+	}
+	return (0);
+}
+
+/* #include <stdio.h> */
+
+/* int	main(void) */
+/* { */
+/* 	char	haystack[] = "abc"; */
+/* 	char	needle[] = "abcde"; */
+/* 	size_t	len = 5; */
+
+/* 	printf("strnstr: %s\n", strnstr(haystack, needle, len)); */
+/* 	printf("ft_strnstr: %s\n", ft_strnstr(haystack, needle, len)); */
+/* } */