Libft/ft_strnstr.c at main · mobouifr/Libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mobouifr <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/11/07 00:30:29 by mobouifr          #+#    #+#             */
/*   Updated: 2023/12/10 15:46:03 by mobouifr         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
{
	size_t	i;
	size_t	j;

	i = 0;
	j = 0;
	if (haystack == NULL && len == 0)
		return (NULL);
	if (needle[0] == '\0')
	{
		return ((char *)haystack);
	}
	while (haystack[i] != '\0' && i < len)
	{
		j = 0;
		while (i + j < len && needle[j] != '\0' && haystack[i + j] == needle[j])
		{
			j++;
			if (needle[j] == '\0')
			{
				return ((char *)&haystack[i]);
			}
		}
		i++;
	}
	return (NULL);
}

// #include <stdio.h>
// #include <string.h>
// int	main(void)
// {
// 	const char	haystack[] = "a wise man once said     ";
// 	const char	needle[] = "once";

// 	//printf("%s\n", ft_strnstr(haystack, needle, 0));
// 	printf("%s\n", strnstr(NULL, needle, 1));
// 	return (0);
// }