ft_strnstr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: youkim <youkim@student.42seoul.kr>         +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/05/09 13:13:06 by youkim            #+#    #+#             */
/*   Updated: 2021/05/09 18:30:22 by youkim           ###   ########.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 (!ft_strlen(needle))
		return ((char *)&haystack[0]);
	while (haystack[i] && i < len)
	{
		j = 0;
		if (haystack[i] == needle[j])
			while (haystack[i + j] == needle[j] && i + j < len)
			{
				j++;
				if (!needle[j])
					return ((char *)&haystack[i]);
			}
		i++;
	}
	return (0);
}