ft_strnstr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: lignigno <lignign@student.21-school.ru>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/10/15 13:49:44 by lumfred           #+#    #+#             */
/*   Updated: 2021/10/20 12:27:51 by lumfred          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
#include "libft.h"

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

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