ft_strnstr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tchevrie <tchevrie@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/09/10 23:52:11 by tchevrie          #+#    #+#             */
/*   Updated: 2022/11/10 14:24:53 by tchevrie         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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