ft_strnstr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: radan <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/10/20 20:57:55 by radan             #+#    #+#             */
/*   Updated: 2021/10/20 21:16:51 by radan            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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