ft_strnstr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jilai <jilai@student.42.fr>                +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/02/23 15:59:05 by jilai             #+#    #+#             */
/*   Updated: 2024/02/23 15:59:07 by jilai            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
{
	size_t	x;
	size_t	y;
	size_t	z;
	char	*str;

	x = 0;
	y = 0;
	str = (char *)haystack;
	if (needle[0] == '\0')
		return (str);
	while ((x < len) && (str[x] != '\0'))
	{
		z = x;
		while (needle[y] != '\0' && (z < len) && (str[z] == needle[y]))
		{
			if (needle[y + 1] == '\0')
				return (&str[x]);
			y++;
			z++;
		}
		y = 0;
		x++;
	}
	return (NULL);
}